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+/* 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_ */
+/** @} */
+