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| -rw-r--r-- | modules/dav/main/mod_dav.h | 2670 |
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diff --git a/modules/dav/main/mod_dav.h b/modules/dav/main/mod_dav.h new file mode 100644 index 0000000..eca34a2 --- /dev/null +++ b/modules/dav/main/mod_dav.h @@ -0,0 +1,2670 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/** + * @file mod_dav.h + * @brief DAV extension module for Apache 2.0.* + * + * @defgroup MOD_DAV mod_dav + * @ingroup APACHE_MODS + * @{ + */ + +#ifndef _MOD_DAV_H_ +#define _MOD_DAV_H_ + +#include "apr_hooks.h" +#include "apr_hash.h" +#include "apr_dbm.h" +#include "apr_tables.h" + +#include "httpd.h" +#include "util_filter.h" +#include "util_xml.h" + +#include <limits.h> /* for INT_MAX */ +#include <time.h> /* for time_t */ + +#ifdef __cplusplus +extern "C" { +#endif + + +#define DAV_VERSION AP_SERVER_BASEREVISION + +#define DAV_XML_HEADER "<?xml version=\"1.0\" encoding=\"utf-8\"?>" +#define DAV_XML_CONTENT_TYPE "text/xml; charset=\"utf-8\"" + +#define DAV_READ_BLOCKSIZE 2048 /* used for reading input blocks */ + +#define DAV_RESPONSE_BODY_1 "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01//EN\" \"http://www.w3.org/TR/html4/strict.dtd\">\n<html>\n<head>\n<title>" +#define DAV_RESPONSE_BODY_2 "</title>\n</head><body>\n<h1>" +#define DAV_RESPONSE_BODY_3 "</h1>\n<p>" +#define DAV_RESPONSE_BODY_4 "</p>\n" +#define DAV_RESPONSE_BODY_5 "</body></html>\n" + +#define DAV_DO_COPY 0 +#define DAV_DO_MOVE 1 + + +#if 1 +#define DAV_DEBUG 1 +#define DEBUG_CR "\n" +#define DBG0(f) ap_log_error(APLOG_MARK, \ + APLOG_ERR, 0, NULL, (f)) +#define DBG1(f,a1) ap_log_error(APLOG_MARK, \ + APLOG_ERR, 0, NULL, f, a1) +#define DBG2(f,a1,a2) ap_log_error(APLOG_MARK, \ + APLOG_ERR, 0, NULL, f, a1, a2) +#define DBG3(f,a1,a2,a3) ap_log_error(APLOG_MARK, \ + APLOG_ERR, 0, NULL, f, a1, a2, a3) +#else +#undef DAV_DEBUG +#define DEBUG_CR "" +#endif + +#define DAV_INFINITY INT_MAX /* for the Depth: header */ + +/* Create a set of DAV_DECLARE(type), DAV_DECLARE_NONSTD(type) and + * DAV_DECLARE_DATA with appropriate export and import tags for the platform + */ +#if !defined(WIN32) +#define DAV_DECLARE(type) type +#define DAV_DECLARE_NONSTD(type) type +#define DAV_DECLARE_DATA +#elif defined(DAV_DECLARE_STATIC) +#define DAV_DECLARE(type) type __stdcall +#define DAV_DECLARE_NONSTD(type) type +#define DAV_DECLARE_DATA +#elif defined(DAV_DECLARE_EXPORT) +#define DAV_DECLARE(type) __declspec(dllexport) type __stdcall +#define DAV_DECLARE_NONSTD(type) __declspec(dllexport) type +#define DAV_DECLARE_DATA __declspec(dllexport) +#else +#define DAV_DECLARE(type) __declspec(dllimport) type __stdcall +#define DAV_DECLARE_NONSTD(type) __declspec(dllimport) type +#define DAV_DECLARE_DATA __declspec(dllimport) +#endif + +/* -------------------------------------------------------------------- +** +** ERROR MANAGEMENT +*/ + +/* +** dav_error structure. +** +** In most cases, mod_dav uses a pointer to a dav_error structure. If the +** pointer is NULL, then no error has occurred. +** +** In certain cases, a dav_error structure is directly used. In these cases, +** a status value of 0 means that an error has not occurred. +** +** Note: this implies that status != 0 whenever an error occurs. +** +** The desc field is optional (it may be NULL). When NULL, it typically +** implies that Apache has a proper description for the specified status. +*/ +typedef struct dav_error { + int status; /* suggested HTTP status (0 for no error) */ + int error_id; /* DAV-specific error ID */ + const char *desc; /* DAV:responsedescription and error log */ + + apr_status_t aprerr; /* APR error if any, or 0/APR_SUCCESS */ + + const char *namespace; /* [optional] namespace of error */ + const char *tagname; /* name of error-tag */ + + struct dav_error *prev; /* previous error (in stack) */ + + const char *childtags; /* error-tag may have children */ + +} dav_error; + +/* +** Create a new error structure. save_errno will be filled with the current +** errno value. +*/ +DAV_DECLARE(dav_error*) dav_new_error(apr_pool_t *p, int status, + int error_id, apr_status_t aprerr, + const char *desc); + + +/* +** Create a new error structure with tagname and (optional) namespace; +** namespace may be NULL, which means "DAV:". +*/ +DAV_DECLARE(dav_error*) dav_new_error_tag(apr_pool_t *p, int status, + int error_id, apr_status_t aprerr, + const char *desc, + const char *namespace, + const char *tagname); + + +/* +** Push a new error description onto the stack of errors. +** +** This function is used to provide an additional description to an existing +** error. +** +** <status> should contain the caller's view of what the current status is, +** given the underlying error. If it doesn't have a better idea, then the +** caller should pass prev->status. +** +** <error_id> can specify a new error_id since the topmost description has +** changed. +*/ +DAV_DECLARE(dav_error*) dav_push_error(apr_pool_t *p, int status, int error_id, + const char *desc, dav_error *prev); + + +/* +** Join two errors together. +** +** This function is used to add a new error stack onto an existing error so +** that subsequent errors can be reported after the first error. It returns +** the correct error stack to use so that the caller can blindly call it +** without checking that both dest and src are not NULL. +** +** <dest> is the error stack that the error will be added to. +** +** <src> is the error stack that will be appended. +*/ +DAV_DECLARE(dav_error*) dav_join_error(dav_error* dest, dav_error* src); + +typedef struct dav_response dav_response; + +/* +** dav_handle_err() +** +** Handle the standard error processing. <err> must be non-NULL. +** +** <response> is set by the following: +** - dav_validate_request() +** - dav_add_lock() +** - repos_hooks->remove_resource +** - repos_hooks->move_resource +** - repos_hooks->copy_resource +** - vsn_hooks->update +*/ +DAV_DECLARE(int) dav_handle_err(request_rec *r, dav_error *err, + dav_response *response); + +/* error ID values... */ + +/* IF: header errors */ +#define DAV_ERR_IF_PARSE 100 /* general parsing error */ +#define DAV_ERR_IF_MULTIPLE_NOT 101 /* multiple "Not" found */ +#define DAV_ERR_IF_UNK_CHAR 102 /* unknown char in header */ +#define DAV_ERR_IF_ABSENT 103 /* no locktokens given */ +#define DAV_ERR_IF_TAGGED 104 /* in parsing tagged-list */ +#define DAV_ERR_IF_UNCLOSED_PAREN 105 /* in no-tagged-list */ + +/* Prop DB errors */ +#define DAV_ERR_PROP_BAD_MAJOR 200 /* major version was wrong */ +#define DAV_ERR_PROP_READONLY 201 /* prop is read-only */ +#define DAV_ERR_PROP_NO_DATABASE 202 /* writable db not avail */ +#define DAV_ERR_PROP_NOT_FOUND 203 /* prop not found */ +#define DAV_ERR_PROP_BAD_LOCKDB 204 /* could not open lockdb */ +#define DAV_ERR_PROP_OPENING 205 /* problem opening propdb */ +#define DAV_ERR_PROP_EXEC 206 /* problem exec'ing patch */ + +/* Predefined DB errors */ +/* ### any to define?? */ + +/* Predefined locking system errors */ +#define DAV_ERR_LOCK_OPENDB 400 /* could not open lockdb */ +#define DAV_ERR_LOCK_NO_DB 401 /* no database defined */ +#define DAV_ERR_LOCK_CORRUPT_DB 402 /* DB is corrupt */ +#define DAV_ERR_LOCK_UNK_STATE_TOKEN 403 /* unknown State-token */ +#define DAV_ERR_LOCK_PARSE_TOKEN 404 /* bad opaquelocktoken */ +#define DAV_ERR_LOCK_SAVE_LOCK 405 /* err saving locks */ + +/* +** Some comments on Error ID values: +** +** The numbers do not necessarily need to be unique. Uniqueness simply means +** that two errors that have not been predefined above can be distinguished +** from each other. At the moment, mod_dav does not use this distinguishing +** feature, but it could be used in the future to collapse <response> elements +** into groups based on the error ID (and associated responsedescription). +** +** If a compute_desc is provided, then the error ID should be unique within +** the context of the compute_desc function (so the function can figure out +** what to filled into the desc). +** +** Basically, subsystems can ignore defining new error ID values if they want +** to. The subsystems *do* need to return the predefined errors when +** appropriate, so that mod_dav can figure out what to do. Subsystems can +** simply leave the error ID field unfilled (zero) if there isn't an error +** that must be placed there. +*/ + + +/* -------------------------------------------------------------------- +** +** HOOK STRUCTURES +** +** These are here for forward-declaration purposes. For more info, see +** the section title "HOOK HANDLING" for more information, plus each +** structure definition. +*/ + +/* forward-declare this structure */ +typedef struct dav_hooks_propdb dav_hooks_propdb; +typedef struct dav_hooks_locks dav_hooks_locks; +typedef struct dav_hooks_vsn dav_hooks_vsn; +typedef struct dav_hooks_repository dav_hooks_repository; +typedef struct dav_hooks_liveprop dav_hooks_liveprop; +typedef struct dav_hooks_binding dav_hooks_binding; +typedef struct dav_hooks_search dav_hooks_search; + +/* ### deprecated name */ +typedef dav_hooks_propdb dav_hooks_db; + + +/* -------------------------------------------------------------------- +** +** RESOURCE HANDLING +*/ + +/* +** Resource Types: +** The base protocol defines only file and collection resources. +** The versioning protocol defines several additional resource types +** to represent artifacts of a version control system. +** +** This enumeration identifies the type of URL used to identify the +** resource. Since the same resource may have more than one type of +** URL which can identify it, dav_resource_type cannot be used +** alone to determine the type of the resource; attributes of the +** dav_resource object must also be consulted. +*/ +typedef enum { + DAV_RESOURCE_TYPE_UNKNOWN, + + DAV_RESOURCE_TYPE_REGULAR, /* file or collection; could be + * unversioned, or version selector, + * or baseline selector */ + + DAV_RESOURCE_TYPE_VERSION, /* version or baseline URL */ + + DAV_RESOURCE_TYPE_HISTORY, /* version or baseline history URL */ + + DAV_RESOURCE_TYPE_WORKING, /* working resource URL */ + + DAV_RESOURCE_TYPE_WORKSPACE, /* workspace URL */ + + DAV_RESOURCE_TYPE_ACTIVITY, /* activity URL */ + + DAV_RESOURCE_TYPE_PRIVATE /* repository-private type */ + +} dav_resource_type; + +/* +** Opaque, repository-specific information for a resource. +*/ +typedef struct dav_resource_private dav_resource_private; + +/* +** Resource descriptor, generated by a repository provider. +** +** Note: the lock-null state is not explicitly represented here, +** since it may be expensive to compute. Use dav_get_resource_state() +** to determine whether a non-existent resource is a lock-null resource. +** +** A quick explanation of how the flags can apply to different resources: +** +** unversioned file or collection: +** type = DAV_RESOURCE_TYPE_REGULAR +** exists = ? (1 if exists) +** collection = ? (1 if collection) +** versioned = 0 +** baselined = 0 +** working = 0 +** +** version-controlled resource or configuration: +** type = DAV_RESOURCE_TYPE_REGULAR +** exists = 1 +** collection = ? (1 if collection) +** versioned = 1 +** baselined = ? (1 if configuration) +** working = ? (1 if checked out) +** +** version/baseline history: +** type = DAV_RESOURCE_TYPE_HISTORY +** exists = 1 +** collection = 0 +** versioned = 0 +** baselined = 0 +** working = 0 +** +** version/baseline: +** type = DAV_RESOURCE_TYPE_VERSION +** exists = 1 +** collection = ? (1 if collection) +** versioned = 1 +** baselined = ? (1 if baseline) +** working = 0 +** +** working resource: +** type = DAV_RESOURCE_TYPE_WORKING +** exists = 1 +** collection = ? (1 if collection) +** versioned = 1 +** baselined = 0 +** working = 1 +** +** workspace: +** type = DAV_RESOURCE_TYPE_WORKSPACE +** exists = ? (1 if exists) +** collection = 1 +** versioned = ? (1 if version-controlled) +** baselined = ? (1 if baseline-controlled) +** working = ? (1 if checked out) +** +** activity: +** type = DAV_RESOURCE_TYPE_ACTIVITY +** exists = ? (1 if exists) +** collection = 0 +** versioned = 0 +** baselined = 0 +** working = 0 +*/ +typedef struct dav_resource { + dav_resource_type type; + + int exists; /* 0 => null resource */ + + int collection; /* 0 => file; can be 1 for + * REGULAR, VERSION, and WORKING resources, + * and is always 1 for WORKSPACE */ + + int versioned; /* 0 => unversioned; can be 1 for + * REGULAR and WORKSPACE resources, + * and is always 1 for VERSION and WORKING */ + + int baselined; /* 0 => not baselined; can be 1 for + * REGULAR, VERSION, and WORKSPACE resources; + * versioned == 1 when baselined == 1 */ + + int working; /* 0 => not checked out; can be 1 for + * REGULAR and WORKSPACE resources, + * and is always 1 for WORKING */ + + const char *uri; /* the URI for this resource; + * currently has an ABI flaw where sometimes it is + * assumed to be encoded and sometimes not */ + + dav_resource_private *info; /* the provider's private info */ + + const dav_hooks_repository *hooks; /* hooks used for this resource */ + + /* When allocating items related specifically to this resource, the + following pool should be used. Its lifetime will be at least as + long as the dav_resource structure. */ + apr_pool_t *pool; + +} dav_resource; + +/* +** Lock token type. Lock providers define the details of a lock token. +** However, all providers are expected to at least be able to parse +** the "opaquelocktoken" scheme, which is represented by a uuid_t. +*/ +typedef struct dav_locktoken dav_locktoken; + +DAV_DECLARE(dav_error *) dav_get_resource(request_rec *r, int label_allowed, + int use_checked_in, dav_resource **res_p); + + +/* -------------------------------------------------------------------- +** +** BUFFER HANDLING +** +** These buffers are used as a lightweight buffer reuse mechanism. Apache +** provides sub-pool creation and destruction to much the same effect, but +** the sub-pools are a bit more general and heavyweight than these buffers. +*/ + +/* buffer for reuse; can grow to accommodate needed size */ +typedef struct +{ + apr_size_t alloc_len; /* how much has been allocated */ + apr_size_t cur_len; /* how much is currently being used */ + char *buf; /* buffer contents */ +} dav_buffer; +#define DAV_BUFFER_MINSIZE 256 /* minimum size for buffer */ +#define DAV_BUFFER_PAD 64 /* amount of pad when growing */ + +/* set the cur_len to the given size and ensure space is available */ +DAV_DECLARE(void) dav_set_bufsize(apr_pool_t *p, dav_buffer *pbuf, + apr_size_t size); + +/* initialize a buffer and copy the specified (null-term'd) string into it */ +DAV_DECLARE(void) dav_buffer_init(apr_pool_t *p, dav_buffer *pbuf, + const char *str); + +/* check that the buffer can accommodate <extra_needed> more bytes */ +DAV_DECLARE(void) dav_check_bufsize(apr_pool_t *p, dav_buffer *pbuf, + apr_size_t extra_needed); + +/* append a string to the end of the buffer, adjust length */ +DAV_DECLARE(void) dav_buffer_append(apr_pool_t *p, dav_buffer *pbuf, + const char *str); + +/* place a string on the end of the buffer, do NOT adjust length */ +DAV_DECLARE(void) dav_buffer_place(apr_pool_t *p, dav_buffer *pbuf, + const char *str); + +/* place some memory on the end of a buffer; do NOT adjust length */ +DAV_DECLARE(void) dav_buffer_place_mem(apr_pool_t *p, dav_buffer *pbuf, + const void *mem, apr_size_t amt, + apr_size_t pad); + + +/* -------------------------------------------------------------------- +** +** HANDY UTILITIES +*/ + +/* contains results from one of the getprop functions */ +typedef struct +{ + apr_text * propstats; /* <propstat> element text */ + apr_text * xmlns; /* namespace decls for <response> elem */ +} dav_get_props_result; + +/* holds the contents of a <response> element */ +struct dav_response +{ + const char *href; /* always */ + const char *desc; /* optional description at <response> level */ + + /* use status if propresult.propstats is NULL. */ + dav_get_props_result propresult; + + int status; + + struct dav_response *next; +}; + +typedef struct +{ + request_rec *rnew; /* new subrequest */ + dav_error err; /* potential error response */ +} dav_lookup_result; + + +DAV_DECLARE(dav_lookup_result) dav_lookup_uri(const char *uri, request_rec *r, + int must_be_absolute); + +/* defines type of property info a provider is to return */ +typedef enum { + DAV_PROP_INSERT_NOTDEF, /* property is defined by this provider, + but nothing was inserted because the + (live) property is not defined for this + resource (it may be present as a dead + property). */ + DAV_PROP_INSERT_NOTSUPP, /* property is recognized by this provider, + but it is not supported, and cannot be + treated as a dead property */ + DAV_PROP_INSERT_NAME, /* a property name (empty elem) was + inserted into the text block */ + DAV_PROP_INSERT_VALUE, /* a property name/value pair was inserted + into the text block */ + DAV_PROP_INSERT_SUPPORTED /* a supported live property was added to + the text block as a + <DAV:supported-live-property> element */ +} dav_prop_insert; + +/* ### this stuff is private to dav/fs/repos.c; move it... */ +/* format a time string (buf must be at least DAV_TIMEBUF_SIZE chars) */ +#define DAV_STYLE_ISO8601 1 +#define DAV_STYLE_RFC822 2 +#define DAV_TIMEBUF_SIZE 30 + +/* Write a complete RESPONSE object out as a <DAV:response> xml + * element. Data is sent into brigade BB, which is auto-flushed into + * the output filter stack for request R. Use POOL for any temporary + * allocations. + * + * [Presumably the <multistatus> tag has already been written; this + * routine is shared by dav_send_multistatus and dav_stream_response.] + */ +DAV_DECLARE(void) dav_send_one_response(dav_response *response, + apr_bucket_brigade *bb, + request_rec *r, + apr_pool_t *pool); + +/* Factorized helper function: prep request_rec R for a multistatus + * response and write <multistatus> tag into BB, destined for + * R->output_filters. Use xml NAMESPACES in initial tag, if + * non-NULL. + */ +DAV_DECLARE(void) dav_begin_multistatus(apr_bucket_brigade *bb, + request_rec *r, int status, + apr_array_header_t *namespaces); + +/* Finish a multistatus response started by dav_begin_multistatus: */ +DAV_DECLARE(apr_status_t) dav_finish_multistatus(request_rec *r, + apr_bucket_brigade *bb); + +/* Send a multistatus response */ +DAV_DECLARE(void) dav_send_multistatus(request_rec *r, int status, + dav_response *first, + apr_array_header_t *namespaces); + +DAV_DECLARE(apr_text *) dav_failed_proppatch(apr_pool_t *p, + apr_array_header_t *prop_ctx); +DAV_DECLARE(apr_text *) dav_success_proppatch(apr_pool_t *p, + apr_array_header_t *prop_ctx); + +DAV_DECLARE(int) dav_get_depth(request_rec *r, int def_depth); + +DAV_DECLARE(int) dav_validate_root(const apr_xml_doc *doc, + const char *tagname); +DAV_DECLARE(int) dav_validate_root_ns(const apr_xml_doc *doc, + int ns, const char *tagname); +DAV_DECLARE(apr_xml_elem *) dav_find_child(const apr_xml_elem *elem, + const char *tagname); +DAV_DECLARE(apr_xml_elem *) dav_find_child_ns(const apr_xml_elem *elem, + int ns, const char *tagname); +DAV_DECLARE(apr_xml_elem *) dav_find_next_ns(const apr_xml_elem *elem, + int ns, const char *tagname); + +/* find and return the attribute with a name in the given namespace */ +DAV_DECLARE(apr_xml_attr *) dav_find_attr_ns(const apr_xml_elem *elem, + int ns, const char *attrname); + +/* find and return the attribute with a given DAV: tagname */ +DAV_DECLARE(apr_xml_attr *) dav_find_attr(const apr_xml_elem *elem, + const char *attrname); + +/* gather up all the CDATA into a single string */ +DAV_DECLARE(const char *) dav_xml_get_cdata(const apr_xml_elem *elem, apr_pool_t *pool, + int strip_white); + +/* +** XML namespace handling +** +** This structure tracks namespace declarations (xmlns:prefix="URI"). +** It maintains a one-to-many relationship of URIs-to-prefixes. In other +** words, one URI may be defined by many prefixes, but any specific +** prefix will specify only one URI. +** +** Prefixes using the "g###" pattern can be generated automatically if +** the caller does not have specific prefix requirements. +*/ +typedef struct { + apr_pool_t *pool; + apr_hash_t *uri_prefix; /* map URIs to an available prefix */ + apr_hash_t *prefix_uri; /* map all prefixes to their URIs */ + int count; /* counter for "g###" prefixes */ +} dav_xmlns_info; + +/* create an empty dav_xmlns_info structure */ +DAV_DECLARE(dav_xmlns_info *) dav_xmlns_create(apr_pool_t *pool); + +/* add a specific prefix/URI pair. the prefix/uri should have a lifetime + at least that of xmlns->pool */ +DAV_DECLARE(void) dav_xmlns_add(dav_xmlns_info *xi, + const char *prefix, const char *uri); + +/* add a URI (if not present); any prefix is acceptable and is returned. + the uri should have a lifetime at least that xmlns->pool */ +DAV_DECLARE(const char *) dav_xmlns_add_uri(dav_xmlns_info *xi, + const char *uri); + +/* return the URI for a specified prefix (or NULL if the prefix is unknown) */ +DAV_DECLARE(const char *) dav_xmlns_get_uri(dav_xmlns_info *xi, + const char *prefix); + +/* return an available prefix for a specified URI (or NULL if the URI + is unknown) */ +DAV_DECLARE(const char *) dav_xmlns_get_prefix(dav_xmlns_info *xi, + const char *uri); + +/* generate xmlns declarations (appending into the given text) */ +DAV_DECLARE(void) dav_xmlns_generate(dav_xmlns_info *xi, + apr_text_header *phdr); + +/* -------------------------------------------------------------------- +** +** DAV PLUGINS +*/ + +/* ### docco ... */ + +/* +** dav_provider +** +** This structure wraps up all of the hooks that a mod_dav provider can +** supply. The provider MUST supply <repos> and <propdb>. The rest are +** optional and should contain NULL if that feature is not supplied. +** +** Note that a provider cannot pick and choose portions from various +** underlying implementations (which was theoretically possible in +** mod_dav 1.0). There are too many dependencies between a dav_resource +** (defined by <repos>) and the other functionality. +** +** Live properties and report extensions are not part of the dav_provider +** structure because they are handled through the APR_HOOK interface (to +** allow for multiple providers). The core always provides some +** properties, and then a given provider will add more properties. +** +** Some providers may need to associate a context with the dav_provider +** structure -- the ctx field is available for storing this context. Just +** leave it NULL if it isn't required. +*/ +typedef struct { + const dav_hooks_repository *repos; + const dav_hooks_propdb *propdb; + const dav_hooks_locks *locks; + const dav_hooks_vsn *vsn; + const dav_hooks_binding *binding; + const dav_hooks_search *search; + + void *ctx; +} dav_provider; + +/* +** gather_propsets: gather all live property propset-URIs +** +** The hook implementor should push one or more URIs into the specified +** array. These URIs are returned in the DAV: header to let clients know +** what sets of live properties are supported by the installation. mod_dav +** will place open/close angle brackets around each value (much like +** a Coded-URL); quotes and brackets should not be in the value. +** +** Example: http://apache.org/dav/props/ +** +** (of course, use your own domain to ensure a unique value) +*/ +APR_DECLARE_EXTERNAL_HOOK(dav, DAV, void, gather_propsets, + (apr_array_header_t *uris)) + +/* +** find_liveprop: find a live property, returning a non-zero, unique, +** opaque identifier. +** +** If the hook implementor determines the specified URI/name refers to +** one of its properties, then it should fill in HOOKS and return a +** non-zero value. The returned value is the "property ID" and will +** be passed to the various liveprop hook functions. +** +** Return 0 if the property is not defined by the hook implementor. +*/ +APR_DECLARE_EXTERNAL_HOOK(dav, DAV, int, find_liveprop, + (const dav_resource *resource, + const char *ns_uri, const char *name, + const dav_hooks_liveprop **hooks)) + +/* +** insert_all_liveprops: insert all (known) live property names/values. +** +** The hook implementor should append XML text to PHDR, containing liveprop +** names. If INSVALUE is true, then the property values should also be +** inserted into the output XML stream. +** +** The liveprop provider should insert *all* known and *defined* live +** properties on the specified resource. If a particular liveprop is +** not defined for this resource, then it should not be inserted. +*/ +APR_DECLARE_EXTERNAL_HOOK(dav, DAV, void, insert_all_liveprops, + (request_rec *r, const dav_resource *resource, + dav_prop_insert what, apr_text_header *phdr)) + +/* +** deliver_report: given a parsed report request, process the request +** an deliver the resulting report. +** +** The hook implementer should decide whether it should handle the given +** report, and if so, write the response to the output filter. If the +** report is not relevant, return DECLINED. +*/ +APR_DECLARE_EXTERNAL_HOOK(dav, DAV, int, deliver_report, + (request_rec *r, + const dav_resource *resource, + const apr_xml_doc *doc, + ap_filter_t *output, dav_error **err)) + +/* +** gather_reports: get all reports. +** +** The hook implementor should push one or more dav_report_elem structures +** containing report names into the specified array. These names are returned +** in the DAV:supported-reports-set property to let clients know +** what reports are supported by the installation. +** +*/ +APR_DECLARE_EXTERNAL_HOOK(dav, DAV, void, gather_reports, + (request_rec *r, const dav_resource *resource, + apr_array_header_t *reports, dav_error **err)) + +/* + ** method_precondition: check method preconditions. + ** + ** If a WebDAV extension needs to set any preconditions on a method, this + ** hook is where to do it. If the precondition fails, return an error + ** response with the tagname set to the value of the failed precondition. + ** + ** If the method requires an XML body, this will be read and provided as + ** the doc value. If not, doc is NULL. An extension that needs to verify + ** the non-XML body of a request should register an input filter to do so + ** within this hook. + ** + ** Methods like PUT will supply a single src resource, and the dst will + ** be NULL. + ** + ** Methods like COPY or MOVE will trigger this hook twice. The first + ** invocation will supply just the source resource. The second invocation + ** will supply a source and destination. This allows preconditions on the + ** source resource to be verified before making an attempt to get the + ** destination resource. + ** + ** Methods like PROPFIND and LABEL will trigger this hook initially for + ** the src resource, and then subsequently for each resource that has + ** been walked during processing, with the walked resource passed in dst, + ** and NULL passed in src. + ** + ** As a rule, the src resource originates from a request that has passed + ** through httpd's authn/authz hooks, while the dst resource has not. + */ +APR_DECLARE_EXTERNAL_HOOK(dav, DAV, int, method_precondition, + (request_rec *r, + dav_resource *src, const dav_resource *dst, + const apr_xml_doc *doc, dav_error **err)) + + +DAV_DECLARE(const dav_hooks_locks *) dav_get_lock_hooks(request_rec *r); +DAV_DECLARE(const dav_hooks_propdb *) dav_get_propdb_hooks(request_rec *r); +DAV_DECLARE(const dav_hooks_vsn *) dav_get_vsn_hooks(request_rec *r); +DAV_DECLARE(const dav_hooks_binding *) dav_get_binding_hooks(request_rec *r); +DAV_DECLARE(const dav_hooks_search *) dav_get_search_hooks(request_rec *r); + +DAV_DECLARE(void) dav_register_provider(apr_pool_t *p, const char *name, + const dav_provider *hooks); +DAV_DECLARE(const dav_provider *) dav_lookup_provider(const char *name); +DAV_DECLARE(const char *) dav_get_provider_name(request_rec *r); +DAV_DECLARE(const dav_provider *) dav_get_provider(request_rec *r); + + +/* ### deprecated */ +#define DAV_GET_HOOKS_PROPDB(r) dav_get_propdb_hooks(r) +#define DAV_GET_HOOKS_LOCKS(r) dav_get_lock_hooks(r) +#define DAV_GET_HOOKS_VSN(r) dav_get_vsn_hooks(r) +#define DAV_GET_HOOKS_BINDING(r) dav_get_binding_hooks(r) +#define DAV_GET_HOOKS_SEARCH(r) dav_get_search_hooks(r) + + +/* -------------------------------------------------------------------- +** +** IF HEADER PROCESSING +** +** Here is the definition of the If: header from RFC 2518, S9.4: +** +** If = "If" ":" (1*No-tag-list | 1*Tagged-list) +** No-tag-list = List +** Tagged-list = Resource 1*List +** Resource = Coded-URL +** List = "(" 1*(["Not"](State-token | "[" entity-tag "]")) ")" +** State-token = Coded-URL +** Coded-URL = "<" absoluteURI ">" ; absoluteURI from RFC 2616 +** +** List corresponds to dav_if_state_list. No-tag-list corresponds to +** dav_if_header with uri==NULL. Tagged-list corresponds to a sequence of +** dav_if_header structures with (duplicate) uri==Resource -- one +** dav_if_header per state_list. A second Tagged-list will start a new +** sequence of dav_if_header structures with the new URI. +** +** A summary of the semantics, mapped into our structures: +** - Chained dav_if_headers: OR +** - Chained dav_if_state_lists: AND +** - NULL uri matches all resources +*/ + +typedef enum +{ + dav_if_etag, + dav_if_opaquelock, + dav_if_unknown /* the "unknown" state type; always matches false. */ +} dav_if_state_type; + +typedef struct dav_if_state_list +{ + dav_if_state_type type; + + int condition; +#define DAV_IF_COND_NORMAL 0 +#define DAV_IF_COND_NOT 1 /* "Not" was applied */ + + const char *etag; + dav_locktoken *locktoken; + + struct dav_if_state_list *next; +} dav_if_state_list; + +typedef struct dav_if_header +{ + const char *uri; + apr_size_t uri_len; + struct dav_if_state_list *state; + struct dav_if_header *next; + + int dummy_header; /* used internally by the lock/etag validation */ +} dav_if_header; + +typedef struct dav_locktoken_list +{ + dav_locktoken *locktoken; + struct dav_locktoken_list *next; +} dav_locktoken_list; + +DAV_DECLARE(dav_error *) dav_get_locktoken_list(request_rec *r, + dav_locktoken_list **ltl); + + +/* -------------------------------------------------------------------- +** +** LIVE PROPERTY HANDLING +*/ + +/* opaque type for PROPPATCH rollback information */ +typedef struct dav_liveprop_rollback dav_liveprop_rollback; + +struct dav_hooks_liveprop +{ + /* + ** Insert property information into a text block. The property to + ** insert is identified by the propid value. The information to insert + ** is identified by the "what" argument, as follows: + ** DAV_PROP_INSERT_NAME + ** property name, as an empty XML element + ** DAV_PROP_INSERT_VALUE + ** property name/value, as an XML element + ** DAV_PROP_INSERT_SUPPORTED + ** if the property is defined on the resource, then + ** a DAV:supported-live-property element, as defined + ** by the DeltaV extensions to RFC2518. + ** + ** Providers should return DAV_PROP_INSERT_NOTDEF if the property is + ** known and not defined for this resource, so should be handled as a + ** dead property. If a provider recognizes, but does not support, a + ** property, and does not want it handled as a dead property, it should + ** return DAV_PROP_INSERT_NOTSUPP. + ** + ** Some DAV extensions, like CalDAV, specify both document elements + ** and property elements that need to be taken into account when + ** generating a property. The document element and property element + ** are made available in the dav_liveprop_elem structure under the + ** resource, accessible as follows: + ** + ** dav_get_liveprop_element(resource); + ** + ** Returns one of DAV_PROP_INSERT_* based on what happened. + ** + ** ### we may need more context... ie. the lock database + */ + dav_prop_insert (*insert_prop)(const dav_resource *resource, + int propid, dav_prop_insert what, + apr_text_header *phdr); + + /* + ** Determine whether a given property is writable. + ** + ** ### we may want a different semantic. i.e. maybe it should be + ** ### "can we write <value> into this property?" + ** + ** Returns 1 if the live property can be written, 0 if read-only. + */ + int (*is_writable)(const dav_resource *resource, int propid); + + /* + ** This member defines the set of namespace URIs that the provider + ** uses for its properties. When insert_all is called, it will be + ** passed a list of integers that map from indices into this list + ** to namespace IDs for output generation. + ** + ** The last entry in this list should be a NULL value (sentinel). + */ + const char * const * namespace_uris; + + /* + ** ### this is not the final design. we want an open-ended way for + ** ### liveprop providers to attach *new* properties. To this end, + ** ### we'll have a "give me a list of the props you define", a way + ** ### to check for a prop's existence, a way to validate a set/remove + ** ### of a prop, and a way to execute/commit/rollback that change. + */ + + /* + ** Validate that the live property can be assigned a value, and that + ** the provided value is valid. + ** + ** elem will point to the XML element that names the property. For + ** example: + ** <lp1:executable>T</lp1:executable> + ** + ** The provider can access the cdata fields and the child elements + ** to extract the relevant pieces. + ** + ** operation is one of DAV_PROP_OP_SET or _DELETE. + ** + ** The provider may return a value in *context which will be passed + ** to each of the exec/commit/rollback functions. For example, this + ** may contain an internal value which has been processed from the + ** input element. + ** + ** The provider must set defer_to_dead to true (non-zero) or false. + ** If true, then the set/remove is deferred to the dead property + ** database. Note: it will be set to zero on entry. + */ + dav_error * (*patch_validate)(const dav_resource *resource, + const apr_xml_elem *elem, + int operation, + void **context, + int *defer_to_dead); + + /* ### doc... */ + dav_error * (*patch_exec)(const dav_resource *resource, + const apr_xml_elem *elem, + int operation, + void *context, + dav_liveprop_rollback **rollback_ctx); + + /* ### doc... */ + void (*patch_commit)(const dav_resource *resource, + int operation, + void *context, + dav_liveprop_rollback *rollback_ctx); + + /* ### doc... */ + dav_error * (*patch_rollback)(const dav_resource *resource, + int operation, + void *context, + dav_liveprop_rollback *rollback_ctx); + + /* + ** If a provider needs a context to associate with this hooks structure, + ** then this field may be used. In most cases, it will just be NULL. + */ + void *ctx; +}; + +/* +** dav_liveprop_spec: specify a live property +** +** This structure is used as a standard way to determine if a particular +** property is a live property. Its use is not part of the mandated liveprop +** interface, but can be used by liveprop providers in conjunction with the +** utility routines below. +** +** spec->name == NULL is the defined end-sentinel for a list of specs. +*/ +typedef struct { + int ns; /* provider-local namespace index */ + const char *name; /* name of the property */ + + int propid; /* provider-local property ID */ + + int is_writable; /* is the property writable? */ + +} dav_liveprop_spec; + +/* +** dav_liveprop_group: specify a group of liveprops +** +** This structure specifies a group of live properties, their namespaces, +** and how to handle them. +*/ +typedef struct { + const dav_liveprop_spec *specs; + const char * const *namespace_uris; + const dav_hooks_liveprop *hooks; + +} dav_liveprop_group; + +/* ### docco */ +DAV_DECLARE(int) dav_do_find_liveprop(const char *ns_uri, const char *name, + const dav_liveprop_group *group, + const dav_hooks_liveprop **hooks); + +/* ### docco */ +DAV_DECLARE(long) dav_get_liveprop_info(int propid, + const dav_liveprop_group *group, + const dav_liveprop_spec **info); + +/* ### docco */ +DAV_DECLARE(void) dav_register_liveprop_group(apr_pool_t *pool, + const dav_liveprop_group *group); + +/* ### docco */ +DAV_DECLARE(long) dav_get_liveprop_ns_index(const char *uri); + +/* ### docco */ +DAV_DECLARE(long) dav_get_liveprop_ns_count(void); + +/* ### docco */ +DAV_DECLARE(void) dav_add_all_liveprop_xmlns(apr_pool_t *p, + apr_text_header *phdr); + +typedef struct { + const apr_xml_doc *doc; + const apr_xml_elem *elem; +} dav_liveprop_elem; + +/* + ** When calling insert_prop(), the associated request element and + ** document is accessible using the following call. + */ +DAV_DECLARE(dav_liveprop_elem *) dav_get_liveprop_element(const dav_resource + *resource); + +/* +** The following three functions are part of mod_dav's internal handling +** for the core WebDAV properties. They are not part of mod_dav's API. +*/ +DAV_DECLARE_NONSTD(int) dav_core_find_liveprop( + const dav_resource *resource, + const char *ns_uri, + const char *name, + const dav_hooks_liveprop **hooks); +DAV_DECLARE_NONSTD(void) dav_core_insert_all_liveprops( + request_rec *r, + const dav_resource *resource, + dav_prop_insert what, + apr_text_header *phdr); +DAV_DECLARE_NONSTD(void) dav_core_register_uris(apr_pool_t *p); + + +/* +** Standard WebDAV Property Identifiers +** +** A live property provider does not need to use these; they are simply +** provided for convenience. +** +** Property identifiers need to be unique within a given provider, but not +** *across* providers (note: this uniqueness constraint was different in +** older versions of mod_dav). +** +** The identifiers start at 20000 to make it easier for providers to avoid +** conflicts with the standard properties. The properties are arranged +** alphabetically, and may be reordered from time to time (as properties +** are introduced). +** +** NOTE: there is no problem with reordering (e.g. binary compat) since the +** identifiers are only used within a given provider, which would pick up +** the entire set of changes upon a recompile. +*/ +enum { + DAV_PROPID_BEGIN = 20000, + + /* Standard WebDAV properties (RFC 2518) */ + DAV_PROPID_creationdate, + DAV_PROPID_displayname, + DAV_PROPID_getcontentlanguage, + DAV_PROPID_getcontentlength, + DAV_PROPID_getcontenttype, + DAV_PROPID_getetag, + DAV_PROPID_getlastmodified, + DAV_PROPID_lockdiscovery, + DAV_PROPID_resourcetype, + DAV_PROPID_source, + DAV_PROPID_supportedlock, + + /* DeltaV properties (from the I-D (#14)) */ + DAV_PROPID_activity_checkout_set, + DAV_PROPID_activity_set, + DAV_PROPID_activity_version_set, + DAV_PROPID_auto_merge_set, + DAV_PROPID_auto_version, + DAV_PROPID_baseline_collection, + DAV_PROPID_baseline_controlled_collection, + DAV_PROPID_baseline_controlled_collection_set, + DAV_PROPID_checked_in, + DAV_PROPID_checked_out, + DAV_PROPID_checkin_fork, + DAV_PROPID_checkout_fork, + DAV_PROPID_checkout_set, + DAV_PROPID_comment, + DAV_PROPID_creator_displayname, + DAV_PROPID_current_activity_set, + DAV_PROPID_current_workspace_set, + DAV_PROPID_default_variant, + DAV_PROPID_eclipsed_set, + DAV_PROPID_label_name_set, + DAV_PROPID_merge_set, + DAV_PROPID_precursor_set, + DAV_PROPID_predecessor_set, + DAV_PROPID_root_version, + DAV_PROPID_subactivity_set, + DAV_PROPID_subbaseline_set, + DAV_PROPID_successor_set, + DAV_PROPID_supported_method_set, + DAV_PROPID_supported_live_property_set, + DAV_PROPID_supported_report_set, + DAV_PROPID_unreserved, + DAV_PROPID_variant_set, + DAV_PROPID_version_controlled_binding_set, + DAV_PROPID_version_controlled_configuration, + DAV_PROPID_version_history, + DAV_PROPID_version_name, + DAV_PROPID_workspace, + DAV_PROPID_workspace_checkout_set, + + DAV_PROPID_END +}; + +/* +** Property Identifier Registration +** +** At the moment, mod_dav requires live property providers to ensure that +** each property returned has a unique value. For now, this is done through +** central registration (there are no known providers other than the default, +** so this remains manageable). +** +** WARNING: the TEST ranges should never be "shipped". +*/ +#define DAV_PROPID_CORE 10000 /* ..10099. defined by mod_dav */ +#define DAV_PROPID_FS 10100 /* ..10299. + mod_dav filesystem provider. */ +#define DAV_PROPID_TEST1 10300 /* ..10399 */ +#define DAV_PROPID_TEST2 10400 /* ..10499 */ +#define DAV_PROPID_TEST3 10500 /* ..10599 */ +/* Next: 10600 */ + + +/* -------------------------------------------------------------------- +** +** DATABASE FUNCTIONS +*/ + +typedef struct dav_db dav_db; +typedef struct dav_namespace_map dav_namespace_map; +typedef struct dav_deadprop_rollback dav_deadprop_rollback; + +typedef struct { + const char *ns; /* "" signals "no namespace" */ + const char *name; +} dav_prop_name; + +/* hook functions to enable pluggable databases */ +struct dav_hooks_propdb +{ + dav_error * (*open)(apr_pool_t *p, const dav_resource *resource, int ro, + dav_db **pdb); + void (*close)(dav_db *db); + + /* + ** In bulk, define any namespaces that the values and their name + ** elements may need. + ** + ** Note: sometimes mod_dav will defer calling this until output_value + ** returns found==1. If the output process needs the dav_xmlns_info + ** filled for its work, then it will need to fill it on demand rather + ** than depending upon this hook to fill in the structure. + ** + ** Note: this will *always* be called during an output sequence. Thus, + ** the provider may rely solely on using this to fill the xmlns info. + */ + dav_error * (*define_namespaces)(dav_db *db, dav_xmlns_info *xi); + + /* + ** Output the value from the database (i.e. add an element name and + ** the value into *phdr). Set *found based on whether the name/value + ** was found in the propdb. + ** + ** Note: it is NOT an error for the key/value pair to not exist. + ** + ** The dav_xmlns_info passed to define_namespaces() is also passed to + ** each output_value() call so that namespaces can be added on-demand. + ** It can also be used to look up prefixes or URIs during the output + ** process. + */ + dav_error * (*output_value)(dav_db *db, const dav_prop_name *name, + dav_xmlns_info *xi, + apr_text_header *phdr, int *found); + + /* + ** Build a mapping from "global" namespaces (stored in apr_xml_*) + ** into provider-local namespace identifiers. + ** + ** This mapping should be done once per set of namespaces, and the + ** resulting mapping should be passed into the store() hook function. + ** + ** Note: usually, there is just a single document/namespaces for all + ** elements passed. However, the generality of creating multiple + ** mappings and passing them to store() is provided here. + ** + ** Note: this is only in preparation for a series of store() calls. + ** As a result, the propdb must be open for read/write access when + ** this function is called. + */ + dav_error * (*map_namespaces)(dav_db *db, + const apr_array_header_t *namespaces, + dav_namespace_map **mapping); + + /* + ** Store a property value for a given name. The value->combined field + ** MUST be set for this call. + ** + ** ### WARNING: current providers will quote the text within ELEM. + ** ### this implies you can call this function only once with a given + ** ### element structure (a second time will quote it again). + */ + dav_error * (*store)(dav_db *db, const dav_prop_name *name, + const apr_xml_elem *elem, + dav_namespace_map *mapping); + + /* remove a given property */ + dav_error * (*remove)(dav_db *db, const dav_prop_name *name); + + /* returns 1 if the record specified by "key" exists; 0 otherwise */ + int (*exists)(dav_db *db, const dav_prop_name *name); + + /* + ** Iterate over the property names in the database. + ** + ** iter->name.ns == iter->name.name == NULL when there are no more names. + ** + ** Note: only one iteration may occur over the propdb at a time. + */ + dav_error * (*first_name)(dav_db *db, dav_prop_name *pname); + dav_error * (*next_name)(dav_db *db, dav_prop_name *pname); + + /* + ** Rollback support: get rollback context, and apply it. + ** + ** struct dav_deadprop_rollback is a provider-private structure; it + ** should remember the name, and the name's old value (or the fact that + ** the value was not present, and should be deleted if a rollback occurs). + */ + dav_error * (*get_rollback)(dav_db *db, const dav_prop_name *name, + dav_deadprop_rollback **prollback); + dav_error * (*apply_rollback)(dav_db *db, + dav_deadprop_rollback *rollback); + + /* + ** If a provider needs a context to associate with this hooks structure, + ** then this field may be used. In most cases, it will just be NULL. + */ + void *ctx; +}; + + +/* -------------------------------------------------------------------- +** +** LOCK FUNCTIONS +*/ + +/* Used to represent a Timeout header of "Infinity" */ +#define DAV_TIMEOUT_INFINITE 0 + +DAV_DECLARE(time_t) dav_get_timeout(request_rec *r); + +/* +** Opaque, provider-specific information for a lock database. +*/ +typedef struct dav_lockdb_private dav_lockdb_private; + +/* +** Opaque, provider-specific information for a lock record. +*/ +typedef struct dav_lock_private dav_lock_private; + +/* +** Lock database type. Lock providers are urged to implement a "lazy" open, so +** doing an "open" is cheap until something is actually needed from the DB. +*/ +typedef struct +{ + const dav_hooks_locks *hooks; /* the hooks used for this lockdb */ + int ro; /* was it opened readonly? */ + + dav_lockdb_private *info; + +} dav_lockdb; + +typedef enum { + DAV_LOCKSCOPE_UNKNOWN, + DAV_LOCKSCOPE_EXCLUSIVE, + DAV_LOCKSCOPE_SHARED +} dav_lock_scope; + +typedef enum { + DAV_LOCKTYPE_UNKNOWN, + DAV_LOCKTYPE_WRITE +} dav_lock_type; + +typedef enum { + DAV_LOCKREC_DIRECT, /* lock asserted on this resource */ + DAV_LOCKREC_INDIRECT, /* lock inherited from a parent */ + DAV_LOCKREC_INDIRECT_PARTIAL /* most info is not filled in */ +} dav_lock_rectype; + +/* +** dav_lock: hold information about a lock on a resource. +** +** This structure is used for both direct and indirect locks. A direct lock +** is a lock applied to a specific resource by the client. An indirect lock +** is one that is inherited from a parent resource by virtue of a non-zero +** Depth: header when the lock was applied. +** +** mod_dav records both types of locks in the lock database, managing their +** addition/removal as resources are moved about the namespace. +** +** Note that the lockdb is free to marshal this structure in any form that +** it likes. +** +** For a "partial" lock, the <rectype> and <locktoken> fields must be filled +** in. All other (user) fields should be zeroed. The lock provider will +** usually fill in the <info> field, and the <next> field may be used to +** construct a list of partial locks. +** +** The lock provider MUST use the info field to store a value such that a +** dav_lock structure can locate itself in the underlying lock database. +** This requirement is needed for refreshing: when an indirect dav_lock is +** refreshed, its reference to the direct lock does not specify the direct's +** resource, so the only way to locate the (refreshed, direct) lock in the +** database is to use the info field. +** +** Note that <is_locknull> only refers to the resource where this lock was +** found. +** ### hrm. that says the abstraction is wrong. is_locknull may disappear. +*/ +typedef struct dav_lock +{ + dav_lock_rectype rectype; /* type of lock record */ + int is_locknull; /* lock establishes a locknull resource */ + + /* ### put the resource in here? */ + + dav_lock_scope scope; /* scope of the lock */ + dav_lock_type type; /* type of lock */ + int depth; /* depth of the lock */ + time_t timeout; /* when the lock will timeout */ + + const dav_locktoken *locktoken; /* the token that was issued */ + + const char *owner; /* (XML) owner of the lock */ + const char *auth_user; /* auth'd username owning lock */ + + dav_lock_private *info; /* private to the lockdb */ + + struct dav_lock *next; /* for managing a list of locks */ +} dav_lock; + +/* Property-related public lock functions */ +DAV_DECLARE(const char *)dav_lock_get_activelock(request_rec *r, + dav_lock *locks, + dav_buffer *pbuf); + +/* LockDB-related public lock functions */ +DAV_DECLARE(dav_error *) dav_open_lockdb(request_rec *r, + int ro, + dav_lockdb **lockdb); +DAV_DECLARE(void) dav_close_lockdb(dav_lockdb *lockdb); +DAV_DECLARE(dav_error *) dav_lock_parse_lockinfo(request_rec *r, + const dav_resource *resource, + dav_lockdb *lockdb, + const apr_xml_doc *doc, + dav_lock **lock_request); +DAV_DECLARE(int) dav_unlock(request_rec *r, + const dav_resource *resource, + const dav_locktoken *locktoken); +DAV_DECLARE(dav_error *) dav_add_lock(request_rec *r, + const dav_resource *resource, + dav_lockdb *lockdb, dav_lock *request, + dav_response **response); +DAV_DECLARE(dav_error *) dav_notify_created(request_rec *r, + dav_lockdb *lockdb, + const dav_resource *resource, + int resource_state, + int depth); + +DAV_DECLARE(dav_error*) dav_lock_query(dav_lockdb *lockdb, + const dav_resource *resource, + dav_lock **locks); + +DAV_DECLARE(dav_error *) dav_validate_request(request_rec *r, + dav_resource *resource, + int depth, + dav_locktoken *locktoken, + dav_response **response, + int flags, + dav_lockdb *lockdb); +/* +** flags: +** 0x0F -- reserved for <dav_lock_scope> values +** +** other flags, detailed below +*/ +#define DAV_VALIDATE_RESOURCE 0x0010 /* validate just the resource */ +#define DAV_VALIDATE_PARENT 0x0020 /* validate resource AND its parent */ +#define DAV_VALIDATE_ADD_LD 0x0040 /* add DAV:lockdiscovery into + the 424 DAV:response */ +#define DAV_VALIDATE_USE_424 0x0080 /* return 424 status, not 207 */ +#define DAV_VALIDATE_IS_PARENT 0x0100 /* for internal use */ +#define DAV_VALIDATE_NO_MODIFY 0x0200 /* resource is not being modified + so allow even if lock token + is not provided */ + +/* Lock-null related public lock functions */ +DAV_DECLARE(int) dav_get_resource_state(request_rec *r, + const dav_resource *resource); + +/* Lock provider hooks. Locking is optional, so there may be no + * lock provider for a given repository. + */ +struct dav_hooks_locks +{ + /* Return the supportedlock property for a resource */ + const char * (*get_supportedlock)( + const dav_resource *resource + ); + + /* Parse a lock token URI, returning a lock token object allocated + * in the given pool. + */ + dav_error * (*parse_locktoken)( + apr_pool_t *p, + const char *char_token, + dav_locktoken **locktoken_p + ); + + /* Format a lock token object into a URI string, allocated in + * the given pool. + * + * Always returns non-NULL. + */ + const char * (*format_locktoken)( + apr_pool_t *p, + const dav_locktoken *locktoken + ); + + /* Compare two lock tokens. + * + * Result < 0 => lt1 < lt2 + * Result == 0 => lt1 == lt2 + * Result > 0 => lt1 > lt2 + */ + int (*compare_locktoken)( + const dav_locktoken *lt1, + const dav_locktoken *lt2 + ); + + /* Open the provider's lock database. + * + * The provider may or may not use a "real" database for locks + * (a lock could be an attribute on a resource, for example). + * + * The provider may choose to use the value of the DAVLockDB directive + * (as returned by dav_get_lockdb_path()) to decide where to place + * any storage it may need. + * + * The request storage pool should be associated with the lockdb, + * so it can be used in subsequent operations. + * + * If ro != 0, only readonly operations will be performed. + * If force == 0, the open can be "lazy"; no subsequent locking operations + * may occur. + * If force != 0, locking operations will definitely occur. + */ + dav_error * (*open_lockdb)( + request_rec *r, + int ro, + int force, + dav_lockdb **lockdb + ); + + /* Indicates completion of locking operations */ + void (*close_lockdb)( + dav_lockdb *lockdb + ); + + /* Take a resource out of the lock-null state. */ + dav_error * (*remove_locknull_state)( + dav_lockdb *lockdb, + const dav_resource *resource + ); + + /* + ** Create a (direct) lock structure for the given resource. A locktoken + ** will be created. + ** + ** The lock provider may store private information into lock->info. + */ + dav_error * (*create_lock)(dav_lockdb *lockdb, + const dav_resource *resource, + dav_lock **lock); + + /* + ** Get the locks associated with the specified resource. + ** + ** If resolve_locks is true (non-zero), then any indirect locks are + ** resolved to their actual, direct lock (i.e. the reference to followed + ** to the original lock). + ** + ** The locks, if any, are returned as a linked list in no particular + ** order. If no locks are present, then *locks will be NULL. + */ + dav_error * (*get_locks)(dav_lockdb *lockdb, + const dav_resource *resource, + int calltype, + dav_lock **locks); + +#define DAV_GETLOCKS_RESOLVED 0 /* resolve indirects to directs */ +#define DAV_GETLOCKS_PARTIAL 1 /* leave indirects partially filled */ +#define DAV_GETLOCKS_COMPLETE 2 /* fill out indirect locks */ + + /* + ** Find a particular lock on a resource (specified by its locktoken). + ** + ** *lock will be set to NULL if the lock is not found. + ** + ** Note that the provider can optimize the unmarshalling -- only one + ** lock (or none) must be constructed and returned. + ** + ** If partial_ok is true (non-zero), then an indirect lock can be + ** partially filled in. Otherwise, another lookup is done and the + ** lock structure will be filled out as a DAV_LOCKREC_INDIRECT. + */ + dav_error * (*find_lock)(dav_lockdb *lockdb, + const dav_resource *resource, + const dav_locktoken *locktoken, + int partial_ok, + dav_lock **lock); + + /* + ** Quick test to see if the resource has *any* locks on it. + ** + ** This is typically used to determine if a non-existent resource + ** has a lock and is (therefore) a locknull resource. + ** + ** WARNING: this function may return TRUE even when timed-out locks + ** exist (i.e. it may not perform timeout checks). + */ + dav_error * (*has_locks)(dav_lockdb *lockdb, + const dav_resource *resource, + int *locks_present); + + /* + ** Append the specified lock(s) to the set of locks on this resource. + ** + ** If "make_indirect" is true (non-zero), then the specified lock(s) + ** should be converted to an indirect lock (if it is a direct lock) + ** before appending. Note that the conversion to an indirect lock does + ** not alter the passed-in lock -- the change is internal the + ** append_locks function. + ** + ** Multiple locks are specified using the lock->next links. + */ + dav_error * (*append_locks)(dav_lockdb *lockdb, + const dav_resource *resource, + int make_indirect, + const dav_lock *lock); + + /* + ** Remove any lock that has the specified locktoken. + ** + ** If locktoken == NULL, then ALL locks are removed. + */ + dav_error * (*remove_lock)(dav_lockdb *lockdb, + const dav_resource *resource, + const dav_locktoken *locktoken); + + /* + ** Refresh all locks, found on the specified resource, which has a + ** locktoken in the provided list. + ** + ** If the lock is indirect, then the direct lock is referenced and + ** refreshed. + ** + ** Each lock that is updated is returned in the <locks> argument. + ** Note that the locks will be fully resolved. + */ + dav_error * (*refresh_locks)(dav_lockdb *lockdb, + const dav_resource *resource, + const dav_locktoken_list *ltl, + time_t new_time, + dav_lock **locks); + + /* + ** Look up the resource associated with a particular locktoken. + ** + ** The search begins at the specified <start_resource> and the lock + ** specified by <locktoken>. + ** + ** If the resource/token specifies an indirect lock, then the direct + ** lock will be looked up, and THAT resource will be returned. In other + ** words, this function always returns the resource where a particular + ** lock (token) was asserted. + ** + ** NOTE: this function pointer is allowed to be NULL, indicating that + ** the provider does not support this type of functionality. The + ** caller should then traverse up the repository hierarchy looking + ** for the resource defining a lock with this locktoken. + */ + dav_error * (*lookup_resource)(dav_lockdb *lockdb, + const dav_locktoken *locktoken, + const dav_resource *start_resource, + const dav_resource **resource); + + /* + ** If a provider needs a context to associate with this hooks structure, + ** then this field may be used. In most cases, it will just be NULL. + */ + void *ctx; +}; + +/* what types of resources can be discovered by dav_get_resource_state() */ +#define DAV_RESOURCE_LOCK_NULL 10 /* resource lock-null */ +#define DAV_RESOURCE_NULL 11 /* resource null */ +#define DAV_RESOURCE_EXISTS 12 /* resource exists */ +#define DAV_RESOURCE_ERROR 13 /* an error occurred */ + + +/* -------------------------------------------------------------------- +** +** PROPERTY HANDLING +*/ + +typedef struct dav_propdb dav_propdb; + +#define DAV_PROPDB_NONE 0 +#define DAV_PROPDB_RO 1 +#define DAV_PROPDB_DISABLE_LOCKDISCOVERY 2 + +DAV_DECLARE(dav_error *) dav_open_propdb( + request_rec *r, + dav_lockdb *lockdb, + const dav_resource *resource, + int flags, + apr_array_header_t *ns_xlate, + dav_propdb **propdb); + +DAV_DECLARE(dav_error *) dav_popen_propdb( + apr_pool_t *p, + request_rec *r, + dav_lockdb *lockdb, + const dav_resource *resource, + int flags, + apr_array_header_t *ns_xlate, + dav_propdb **propdb); + + +DAV_DECLARE(void) dav_close_propdb(dav_propdb *db); + +DAV_DECLARE(dav_get_props_result) dav_get_props( + dav_propdb *db, + apr_xml_doc *doc); + +DAV_DECLARE(dav_get_props_result) dav_get_allprops( + dav_propdb *db, + dav_prop_insert what); + +DAV_DECLARE(void) dav_get_liveprop_supported( + dav_propdb *propdb, + const char *ns_uri, + const char *propname, + apr_text_header *body); + +/* +** 3-phase property modification. +** +** 1) validate props. readable? unlocked? ACLs allow access? +** 2) execute operation (set/delete) +** 3) commit or rollback +** +** ### eventually, auth must be available. a ref to the request_rec (which +** ### contains the auth info) should be in the shared context struct. +** +** Each function may alter the error values and information contained within +** the context record. This should be done as an "increasing" level of +** error, rather than overwriting any previous error. +** +** Note that commit() cannot generate errors. It should simply free the +** rollback information. +** +** rollback() may generate additional errors because the rollback operation +** can sometimes fail(!). +** +** The caller should allocate an array of these, one per operation. It should +** be zero-initialized, then the db, operation, and prop fields should be +** filled in before calling dav_prop_validate. Note that the set/delete +** operations are order-dependent. For a given (logical) context, the same +** pointer must be passed to each phase. +** +** error_type is an internal value, but will have the same numeric value +** for each possible "desc" value. This allows the caller to group the +** descriptions via the error_type variable, rather than through string +** comparisons. Note that "status" does not provide enough granularity to +** differentiate/group the "desc" values. +** +** Note that the propdb will maintain some (global) context across all +** of the property change contexts. This implies that you can have only +** one open transaction per propdb. +*/ +typedef struct dav_prop_ctx +{ + dav_propdb *propdb; + + apr_xml_elem *prop; /* property to affect */ + + int operation; +#define DAV_PROP_OP_SET 1 /* set a property value */ +#define DAV_PROP_OP_DELETE 2 /* delete a prop value */ +/* ### add a GET? */ + + /* private items to the propdb */ + int is_liveprop; + void *liveprop_ctx; + struct dav_rollback_item *rollback; /* optional rollback info */ + + dav_error *err; /* error (if any) */ + + /* private to mod_dav.c */ + request_rec *r; + +} dav_prop_ctx; + +DAV_DECLARE_NONSTD(void) dav_prop_validate(dav_prop_ctx *ctx); +DAV_DECLARE_NONSTD(void) dav_prop_exec(dav_prop_ctx *ctx); +DAV_DECLARE_NONSTD(void) dav_prop_commit(dav_prop_ctx *ctx); +DAV_DECLARE_NONSTD(void) dav_prop_rollback(dav_prop_ctx *ctx); + +#define DAV_PROP_CTX_HAS_ERR(dpc) ((dpc).err && (dpc).err->status >= 300) + + +/* -------------------------------------------------------------------- +** +** WALKER STRUCTURE +*/ + +enum { + DAV_CALLTYPE_MEMBER = 1, /* called for a member resource */ + DAV_CALLTYPE_COLLECTION, /* called for a collection */ + DAV_CALLTYPE_LOCKNULL /* called for a locknull resource */ +}; + +typedef struct +{ + /* the client-provided context */ + void *walk_ctx; + + /* pool to use for allocations in the callback */ + apr_pool_t *pool; + + /* the current resource */ + const dav_resource *resource; + + /* OUTPUT: add responses to this */ + dav_response *response; + +} dav_walk_resource; + +typedef struct +{ + int walk_type; +#define DAV_WALKTYPE_AUTH 0x0001 /* limit to authorized files */ +#define DAV_WALKTYPE_NORMAL 0x0002 /* walk normal files */ +#define DAV_WALKTYPE_LOCKNULL 0x0004 /* walk locknull resources */ + + /* callback function and a client context for the walk */ + dav_error * (*func)(dav_walk_resource *wres, int calltype); + void *walk_ctx; + + /* what pool to use for allocations needed by walk logic */ + apr_pool_t *pool; + + /* beginning root of the walk */ + const dav_resource *root; + + /* lock database to enable walking LOCKNULL resources */ + dav_lockdb *lockdb; + +} dav_walk_params; + +/* directory tree walking context */ +typedef struct dav_walker_ctx +{ + /* input: */ + dav_walk_params w; + + + /* ### client data... phasing out this big glom */ + + /* this brigade buffers data being sent to r->output_filters */ + apr_bucket_brigade *bb; + + /* a scratch pool, used to stream responses and iteratively cleared. */ + apr_pool_t *scratchpool; + + request_rec *r; /* original request */ + + /* for PROPFIND operations */ + apr_xml_doc *doc; + int propfind_type; +#define DAV_PROPFIND_IS_ALLPROP 1 +#define DAV_PROPFIND_IS_PROPNAME 2 +#define DAV_PROPFIND_IS_PROP 3 + + apr_text *propstat_404; /* (cached) propstat giving a 404 error */ + + const dav_if_header *if_header; /* for validation */ + const dav_locktoken *locktoken; /* for UNLOCK */ + const dav_lock *lock; /* for LOCK */ + int skip_root; /* for dav_inherit_locks() */ + + int flags; + + dav_buffer work_buf; /* for dav_validate_request() */ + +} dav_walker_ctx; + +DAV_DECLARE(void) dav_add_response(dav_walk_resource *wres, + int status, + dav_get_props_result *propstats); + + +/* -------------------------------------------------------------------- +** +** "STREAM" STRUCTURE +** +** mod_dav uses this abstraction for interacting with the repository +** while fetching/storing resources. mod_dav views resources as a stream +** of bytes. +** +** Note that the structure is opaque -- it is private to the repository +** that created the stream in the repository's "open" function. +** +** ### THIS STUFF IS GOING AWAY ... GET/read requests are handled by +** ### having the provider jam stuff straight into the filter stack. +** ### this is only left for handling PUT/write requests. +*/ + +typedef struct dav_stream dav_stream; + +typedef enum { + DAV_MODE_WRITE_TRUNC, /* truncate and open for writing */ + DAV_MODE_WRITE_SEEKABLE /* open for writing; random access */ +} dav_stream_mode; + + +/* -------------------------------------------------------------------- +** +** REPOSITORY FUNCTIONS +*/ + +/* Repository provider hooks */ +struct dav_hooks_repository +{ + /* Flag for whether repository requires special GET handling. + * If resources in the repository are not visible in the + * filesystem location which URLs map to, then special handling + * is required to first fetch a resource from the repository, + * respond to the GET request, then free the resource copy. + */ + int handle_get; + + /* Get a resource descriptor for the URI in a request. A descriptor + * should always be returned even if the resource does not exist. This + * repository has been identified as handling the resource given by + * the URI, so an answer must be given. If there is a problem with the + * URI or accessing the resource or whatever, then an error should be + * returned. + * + * root_dir: + * the root of the directory for which this repository is configured. + * + * label: + * if a Label: header is present (and allowed), this is the label + * to use to identify a version resource from the resource's + * corresponding version history. Otherwise, it will be NULL. + * + * use_checked_in: + * use the DAV:checked-in property of the resource identified by the + * Request-URI to identify and return a version resource + * + * The provider may associate the request storage pool with the resource + * (in the resource->pool field), to use in other operations on that + * resource. + */ + dav_error * (*get_resource)( + request_rec *r, + const char *root_dir, + const char *label, + int use_checked_in, + dav_resource **resource + ); + + /* Get a resource descriptor for the parent of the given resource. + * The resources need not exist. NULL is returned if the resource + * is the root collection. + * + * An error should be returned only if there is a fatal error in + * fetching information about the parent resource. + */ + dav_error * (*get_parent_resource)( + const dav_resource *resource, + dav_resource **parent_resource + ); + + /* Determine whether two resource descriptors refer to the same resource. + * + * Result != 0 => the resources are the same. + */ + int (*is_same_resource)( + const dav_resource *res1, + const dav_resource *res2 + ); + + /* Determine whether one resource is a parent (immediate or otherwise) + * of another. + * + * Result != 0 => res1 is a parent of res2. + */ + int (*is_parent_resource)( + const dav_resource *res1, + const dav_resource *res2 + ); + + /* + ** Open a stream for this resource, using the specified mode. The + ** stream will be returned in *stream. + */ + dav_error * (*open_stream)(const dav_resource *resource, + dav_stream_mode mode, + dav_stream **stream); + + /* + ** Close the specified stream. + ** + ** mod_dav will (ideally) make sure to call this. For safety purposes, + ** a provider should (ideally) register a cleanup function with the + ** request pool to get this closed and cleaned up. + ** + ** Note the possibility of an error from the close -- it is entirely + ** feasible that the close does a "commit" of some kind, which can + ** produce an error. + ** + ** commit should be TRUE (non-zero) or FALSE (0) if the stream was + ** opened for writing. This flag states whether to retain the file + ** or not. + ** Note: the commit flag is ignored for streams opened for reading. + */ + dav_error * (*close_stream)(dav_stream *stream, int commit); + + /* + ** Write data to the stream. + ** + ** All of the bytes must be written, or an error should be returned. + */ + dav_error * (*write_stream)(dav_stream *stream, + const void *buf, apr_size_t bufsize); + + /* + ** Seek to an absolute position in the stream. This is used to support + ** Content-Range in a GET/PUT. + ** + ** NOTE: if this function is NULL (which is allowed), then any + ** operations using Content-Range will be refused. + */ + dav_error * (*seek_stream)(dav_stream *stream, apr_off_t abs_position); + + /* + ** If a GET is processed using a stream (open_stream, read_stream) + ** rather than via a sub-request (on get_pathname), then this function + ** is used to provide the repository with a way to set the headers + ** in the response. + ** + ** This function may be called without a following deliver(), to + ** handle a HEAD request. + ** + ** This may be NULL if handle_get is FALSE. + */ + dav_error * (*set_headers)(request_rec *r, + const dav_resource *resource); + + /* + ** The provider should deliver the resource into the specified filter. + ** Basically, this is the response to the GET method. + ** + ** Note that this is called for all resources, including collections. + ** The provider should determine what has content to deliver or not. + ** + ** set_headers will be called prior to this function, allowing the + ** provider to set the appropriate response headers. + ** + ** This may be NULL if handle_get is FALSE. + ** ### maybe toss handle_get and just use this function as the marker + */ + dav_error * (*deliver)(const dav_resource *resource, + ap_filter_t *output); + + /* Create a collection resource. The resource must not already exist. + * + * Result == NULL if the collection was created successfully. Also, the + * resource object is updated to reflect that the resource exists, and + * is a collection. + */ + dav_error * (*create_collection)( + dav_resource *resource + ); + + /* Copy one resource to another. The destination may exist, if it is + * versioned. + * Handles both files and collections. Properties are copied as well. + * If the destination exists and is versioned, the provider must update + * the destination to have identical content to the source, + * recursively for collections. + * The depth argument is ignored for a file, and can be either 0 or + * DAV_INFINITY for a collection. + * If an error occurs in a child resource, then the return value is + * non-NULL, and *response is set to a multistatus response. + * If the copy is successful, the dst resource object is + * updated to reflect that the resource exists. + */ + dav_error * (*copy_resource)( + const dav_resource *src, + dav_resource *dst, + int depth, + dav_response **response + ); + + /* Move one resource to another. The destination must not exist. + * Handles both files and collections. Properties are moved as well. + * If an error occurs in a child resource, then the return value is + * non-NULL, and *response is set to a multistatus response. + * If the move is successful, the src and dst resource objects are + * updated to reflect that the source no longer exists, and the + * destination does. + */ + dav_error * (*move_resource)( + dav_resource *src, + dav_resource *dst, + dav_response **response + ); + + /* Remove a resource. Handles both files and collections. + * Removes any associated properties as well. + * If an error occurs in a child resource, then the return value is + * non-NULL, and *response is set to a multistatus response. + * If the delete is successful, the resource object is updated to + * reflect that the resource no longer exists. + */ + dav_error * (*remove_resource)( + dav_resource *resource, + dav_response **response + ); + + /* Walk a resource hierarchy. + * + * Iterates over the resource hierarchy specified by params->root. + * Control of the walk and the callback are specified by 'params'. + * + * An error may be returned. *response will contain multistatus + * responses (if any) suitable for the body of the error. It is also + * possible to return NULL, yet still have multistatus responses. + * In this case, typically the caller should return a 207 (Multistatus) + * and the responses (in the body) as the HTTP response. + */ + dav_error * (*walk)(const dav_walk_params *params, int depth, + dav_response **response); + + /* Get the entity tag for a resource */ + const char * (*getetag)(const dav_resource *resource); + + /* + ** If a provider needs a context to associate with this hooks structure, + ** then this field may be used. In most cases, it will just be NULL. + */ + void *ctx; + + /* Get the request rec for a resource */ + request_rec * (*get_request_rec)(const dav_resource *resource); + + /* Get the pathname for a resource */ + const char * (*get_pathname)(const dav_resource *resource); +}; + + +/* -------------------------------------------------------------------- +** +** VERSIONING FUNCTIONS +*/ + + +/* dav_add_vary_header + * + * If there were any headers in the request which require a Vary header + * in the response, add it. + */ +DAV_DECLARE(void) dav_add_vary_header(request_rec *in_req, + request_rec *out_req, + const dav_resource *resource); + +/* +** Flags specifying auto-versioning behavior, returned by +** the auto_versionable hook. The value returned depends +** on both the state of the resource and the value of the +** DAV:auto-versioning property for the resource. +** +** If the resource does not exist (null or lock-null), +** DAV_AUTO_VERSION_ALWAYS causes creation of a new version-controlled resource +** +** If the resource is checked in, +** DAV_AUTO_VERSION_ALWAYS causes it to be checked out always, +** DAV_AUTO_VERSION_LOCKED causes it to be checked out only when locked +** +** If the resource is checked out, +** DAV_AUTO_VERSION_ALWAYS causes it to be checked in always, +** DAV_AUTO_VERSION_LOCKED causes it to be checked in when unlocked +** (note: a provider should allow auto-checkin only for resources which +** were automatically checked out) +** +** In all cases, DAV_AUTO_VERSION_NEVER results in no auto-versioning behavior. +*/ +typedef enum { + DAV_AUTO_VERSION_NEVER, + DAV_AUTO_VERSION_ALWAYS, + DAV_AUTO_VERSION_LOCKED +} dav_auto_version; + +/* +** This structure is used to record what auto-versioning operations +** were done to make a resource writable, so that they can be undone +** at the end of a request. +*/ +typedef struct { + int resource_versioned; /* 1 => resource was auto-version-controlled */ + int resource_checkedout; /* 1 => resource was auto-checked-out */ + int parent_checkedout; /* 1 => parent was auto-checked-out */ + dav_resource *parent_resource; /* parent resource, if it was needed */ +} dav_auto_version_info; + +/* Ensure that a resource is writable. If there is no versioning + * provider, then this is essentially a no-op. Versioning repositories + * require explicit resource creation and checkout before they can + * be written to. If a new resource is to be created, or an existing + * resource deleted, the parent collection must be checked out as well. + * + * Set the parent_only flag to only make the parent collection writable. + * Otherwise, both parent and child are made writable as needed. If the + * child does not exist, then a new versioned resource is created and + * checked out. + * + * If auto-versioning is not enabled for a versioned resource, then an error is + * returned, since the resource cannot be modified. + * + * The dav_auto_version_info structure is filled in with enough information + * to restore both parent and child resources to the state they were in + * before the auto-versioning operations occurred. + */ +DAV_DECLARE(dav_error *) dav_auto_checkout( + request_rec *r, + dav_resource *resource, + int parent_only, + dav_auto_version_info *av_info); + +/* Revert the writability of resources back to what they were + * before they were modified. If undo == 0, then the resource + * modifications are maintained (i.e. they are checked in). + * If undo != 0, then resource modifications are discarded + * (i.e. they are unchecked out). + * + * Set the unlock flag to indicate that the resource is about + * to be unlocked; it will be checked in if the resource + * auto-versioning property indicates it should be. In this case, + * av_info is ignored, so it can be NULL. + * + * The resource argument may be NULL if only the parent resource + * was checked out (i.e. the parent_only was != 0 in the + * dav_auto_checkout call). + */ +DAV_DECLARE(dav_error *) dav_auto_checkin( + request_rec *r, + dav_resource *resource, + int undo, + int unlock, + dav_auto_version_info *av_info); + +/* +** This structure is used to describe available reports +** +** "nmspace" should be valid XML and URL-quoted. mod_dav will place +** double-quotes around it and use it in an xmlns declaration. +*/ +typedef struct { + const char *nmspace; /* namespace of the XML report element */ + const char *name; /* element name for the XML report */ +} dav_report_elem; + + +/* Versioning provider hooks */ +struct dav_hooks_vsn +{ + /* + ** MANDATORY HOOKS + ** The following hooks are mandatory for all versioning providers; + ** they define the functionality needed to implement "core" versioning. + */ + + /* Return supported versioning options. + * Each dav_text item in the list will be returned as a separate + * DAV header. Providers are advised to limit the length of an + * individual text item to 63 characters, to conform to the limit + * used by MS Web Folders. + */ + void (*get_vsn_options)(apr_pool_t *p, apr_text_header *phdr); + + /* Get the value of a specific option for an OPTIONS request. + * The option being requested is given by the parsed XML + * element object "elem". The value of the option should be + * appended to the "option" text object. + */ + dav_error * (*get_option)(const dav_resource *resource, + const apr_xml_elem *elem, + apr_text_header *option); + + /* Determine whether a non-versioned (or non-existent) resource + * is versionable. Returns != 0 if resource can be versioned. + */ + int (*versionable)(const dav_resource *resource); + + /* Determine whether auto-versioning is enabled for a resource + * (which may not exist, or may not be versioned). If the resource + * is a checked-out resource, the provider must only enable + * auto-checkin if the resource was automatically checked out. + * + * The value returned depends on both the state of the resource + * and the value of its DAV:auto-version property. See the description + * of the dav_auto_version enumeration above for the details. + */ + dav_auto_version (*auto_versionable)(const dav_resource *resource); + + /* Put a resource under version control. If the resource already + * exists unversioned, then it becomes the initial version of the + * new version history, and it is replaced by a version selector + * which targets the new version. + * + * If the resource does not exist, then a new version-controlled + * resource is created which either targets an existing version (if the + * "target" argument is not NULL), or the initial, empty version + * in a new history resource (if the "target" argument is NULL). + * + * If successful, the resource object state is updated appropriately + * (that is, changed to refer to the new version-controlled resource). + */ + dav_error * (*vsn_control)(dav_resource *resource, + const char *target); + + /* Checkout a resource. If successful, the resource + * object state is updated appropriately. + * + * The auto_checkout flag will be set if this checkout is being + * done automatically, as part of some method which modifies + * the resource. The provider must remember that the resource + * was automatically checked out, so it can determine whether it + * can be automatically checked in. (Auto-checkin should only be + * enabled for resources which were automatically checked out.) + * + * If the working resource has a different URL from the + * target resource, a dav_resource descriptor is returned + * for the new working resource. Otherwise, the original + * resource descriptor will refer to the working resource. + * The working_resource argument can be NULL if the caller + * is not interested in the working resource. + * + * If the client has specified DAV:unreserved or DAV:fork-ok in the + * checkout request, then the corresponding flags are set. If + * DAV:activity-set has been specified, then create_activity is set + * if DAV:new was specified; otherwise, the DAV:href elements' CDATA + * (the actual href text) is passed in the "activities" array (each + * element of the array is a const char *). activities will be NULL + * no DAV:activity-set was provided or when create_activity is set. + */ + dav_error * (*checkout)(dav_resource *resource, + int auto_checkout, + int is_unreserved, int is_fork_ok, + int create_activity, + apr_array_header_t *activities, + dav_resource **working_resource); + + /* Uncheckout a checked-out resource. If successful, the resource + * object state is updated appropriately. + */ + dav_error * (*uncheckout)(dav_resource *resource); + + /* Checkin a checked-out resource. If successful, the resource + * object state is updated appropriately, and the + * version_resource descriptor will refer to the new version. + * The version_resource argument can be NULL if the caller + * is not interested in the new version resource. + * + * If the client has specified DAV:keep-checked-out in the checkin + * request, then the keep_checked_out flag is set. The provider + * should create a new version, but keep the resource in the + * checked-out state. + */ + dav_error * (*checkin)(dav_resource *resource, + int keep_checked_out, + dav_resource **version_resource); + + /* + ** Return the set of reports available at this resource. + ** + ** An array of report elements should be returned, with an end-marker + ** element containing namespace==NULL. The value of the + ** DAV:supported-report-set property will be constructed and + ** returned. + */ + dav_error * (*avail_reports)(const dav_resource *resource, + const dav_report_elem **reports); + + /* + ** Determine whether a Label header can be used + ** with a particular report. The dav_xml_doc structure + ** contains the parsed report request body. + ** Returns 0 if the Label header is not allowed. + */ + int (*report_label_header_allowed)(const apr_xml_doc *doc); + + /* + ** Generate a report on a resource. Since a provider is free + ** to define its own reports, and the value of request headers + ** may affect the interpretation of a report, the request record + ** must be passed to this routine. + ** + ** The dav_xml_doc structure contains the parsed report request + ** body. The report response should be generated into the specified + ** output filter. + ** + ** If an error occurs, and a response has not yet been generated, + ** then an error can be returned from this function. mod_dav will + ** construct an appropriate error response. Once some output has + ** been placed into the filter, however, the provider should not + ** return an error -- there is no way that mod_dav can deliver it + ** properly. + ** + ** ### maybe we need a way to signal an error anyways, and then + ** ### apache can abort the connection? + */ + dav_error * (*deliver_report)(request_rec *r, + const dav_resource *resource, + const apr_xml_doc *doc, + ap_filter_t *output); + + /* + ** OPTIONAL HOOKS + ** The following hooks are optional; if not defined, then the + ** corresponding protocol methods will be unsupported. + */ + + /* + ** Set the state of a checked-in version-controlled resource. + ** + ** If the request specified a version, the version resource + ** represents that version. If the request specified a label, + ** then "version" is NULL, and "label" is the label. + ** + ** The depth argument is ignored for a file, and can be 0, 1, or + ** DAV_INFINITY for a collection. The depth argument only applies + ** with a label, not a version. + ** + ** If an error occurs in a child resource, then the return value is + ** non-NULL, and *response is set to a multistatus response. + ** + ** This hook is optional; if not defined, then the UPDATE method + ** will not be supported. + */ + dav_error * (*update)(const dav_resource *resource, + const dav_resource *version, + const char *label, + int depth, + dav_response **response); + + /* + ** Add a label to a version. The resource is either a specific + ** version, or a version selector, in which case the label should + ** be added to the current target of the version selector. The + ** version selector cannot be checked out. + ** + ** If replace != 0, any existing label by the same name is + ** effectively deleted first. Otherwise, it is an error to + ** attempt to add a label which already exists on some version + ** of the same history resource. + ** + ** This hook is optional; if not defined, then the LABEL method + ** will not be supported. If it is defined, then the remove_label + ** hook must be defined also. + */ + dav_error * (*add_label)(const dav_resource *resource, + const char *label, + int replace); + + /* + ** Remove a label from a version. The resource is either a specific + ** version, or a version selector, in which case the label should + ** be added to the current target of the version selector. The + ** version selector cannot be checked out. + ** + ** It is an error if no such label exists on the specified version. + ** + ** This hook is optional, but if defined, the add_label hook + ** must be defined also. + */ + dav_error * (*remove_label)(const dav_resource *resource, + const char *label); + + /* + ** Determine whether a null resource can be created as a workspace. + ** The provider may restrict workspaces to certain locations. + ** Returns 0 if the resource cannot be a workspace. + ** + ** This hook is optional; if the provider does not support workspaces, + ** it should be set to NULL. + */ + int (*can_be_workspace)(const dav_resource *resource); + + /* + ** Create a workspace resource. The resource must not already + ** exist. Any <DAV:mkworkspace> element is passed to the provider + ** in the "doc" structure; it may be empty. + ** + ** If workspace creation is successful, the state of the resource + ** object is updated appropriately. + ** + ** This hook is optional; if the provider does not support workspaces, + ** it should be set to NULL. + */ + dav_error * (*make_workspace)(dav_resource *resource, + apr_xml_doc *doc); + + /* + ** Determine whether a null resource can be created as an activity. + ** The provider may restrict activities to certain locations. + ** Returns 0 if the resource cannot be an activity. + ** + ** This hook is optional; if the provider does not support activities, + ** it should be set to NULL. + */ + int (*can_be_activity)(const dav_resource *resource); + + /* + ** Create an activity resource. The resource must not already + ** exist. + ** + ** If activity creation is successful, the state of the resource + ** object is updated appropriately. + ** + ** This hook is optional; if the provider does not support activities, + ** it should be set to NULL. + */ + dav_error * (*make_activity)(dav_resource *resource); + + /* + ** Merge a resource (tree) into target resource (tree). + ** + ** ### more doc... + ** + ** This hook is optional; if the provider does not support merging, + ** then this should be set to NULL. + */ + dav_error * (*merge)(dav_resource *target, dav_resource *source, + int no_auto_merge, int no_checkout, + apr_xml_elem *prop_elem, + ap_filter_t *output); + + /* + ** If a provider needs a context to associate with this hooks structure, + ** then this field may be used. In most cases, it will just be NULL. + */ + void *ctx; +}; + + +/* -------------------------------------------------------------------- +** +** BINDING FUNCTIONS +*/ + +/* binding provider hooks */ +struct dav_hooks_binding { + + /* Determine whether a resource can be the target of a binding. + * Returns 0 if the resource cannot be a binding target. + */ + int (*is_bindable)(const dav_resource *resource); + + /* Create a binding to a resource. + * The resource argument is the target of the binding; + * the binding argument must be a resource which does not already + * exist. + */ + dav_error * (*bind_resource)(const dav_resource *resource, + dav_resource *binding); + + /* + ** If a provider needs a context to associate with this hooks structure, + ** then this field may be used. In most cases, it will just be NULL. + */ + void *ctx; + +}; + + +/* -------------------------------------------------------------------- +** +** SEARCH(DASL) FUNCTIONS +*/ + +/* search provider hooks */ +struct dav_hooks_search { + /* Set header for a OPTION method + * An error may be returned. + * To set a hadder, this function might call + * apr_table_setn(r->headers_out, "DASL", dasl_optin1); + * + * Examples: + * DASL: <DAV:basicsearch> + * DASL: <http://foo.bar.com/syntax1> + * DASL: <http://akuma.com/syntax2> + */ + dav_error * (*set_option_head)(request_rec *r); + + /* Search resources + * An error may be returned. *response will contain multistatus + * responses (if any) suitable for the body of the error. It is also + * possible to return NULL, yet still have multistatus responses. + * In this case, typically the caller should return a 207 (Multistatus) + * and the responses (in the body) as the HTTP response. + */ + dav_error * (*search_resource)(request_rec *r, + dav_response **response); + + /* + ** If a provider needs a context to associate with this hooks structure, + ** then this field may be used. In most cases, it will just be NULL. + */ + void *ctx; + +}; + + +/* -------------------------------------------------------------------- +** +** MISCELLANEOUS STUFF +*/ + +typedef struct { + int propid; /* live property ID */ + const dav_hooks_liveprop *provider; /* the provider defining this prop */ +} dav_elem_private; + +/* -------------------------------------------------------------------- +** +** DAV OPTIONS +*/ +#define DAV_OPTIONS_EXTENSION_GROUP "dav_options" + +typedef struct dav_options_provider +{ + dav_error* (*dav_header)(request_rec *r, + const dav_resource *resource, + apr_text_header *phdr); + + dav_error* (*dav_method)(request_rec *r, + const dav_resource *resource, + apr_text_header *phdr); + + void *ctx; +} dav_options_provider; + +extern DAV_DECLARE(const dav_options_provider *) dav_get_options_providers(const char *name); + +extern DAV_DECLARE(void) dav_options_provider_register(apr_pool_t *p, + const char *name, + const dav_options_provider *provider); + +/* -------------------------------------------------------------------- +** +** DAV RESOURCE TYPE HOOKS +*/ + +typedef struct dav_resource_type_provider +{ + int (*get_resource_type)(const dav_resource *resource, + const char **name, + const char **uri); +} dav_resource_type_provider; + +#define DAV_RESOURCE_TYPE_GROUP "dav_resource_type" + +DAV_DECLARE(void) dav_resource_type_provider_register(apr_pool_t *p, + const char *name, + const dav_resource_type_provider *provider); + +DAV_DECLARE(const dav_resource_type_provider *) dav_get_resource_type_providers(const char *name); + +#ifdef __cplusplus +} +#endif + +#endif /* _MOD_DAV_H_ */ +/** @} */ + |