/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
 */

#include "lib.h"
#include "str-sanitize.h"
#include "mail-storage.h"
#include "mail-namespace.h"

#include "sieve-common.h"
#include "sieve-commands.h"
#include "sieve-actions.h"
#include "sieve-stringlist.h"
#include "sieve-code.h"
#include "sieve-validator.h"
#include "sieve-generator.h"
#include "sieve-interpreter.h"
#include "sieve-dump.h"

#include "ext-metadata-common.h"

/*
 * Command definitions
 */

/* Forward declarations */

static bool
tst_metadataexists_validate(struct sieve_validator *valdtr,
			    struct sieve_command *tst);
static bool
tst_metadataexists_generate(const struct sieve_codegen_env *cgenv,
			    struct sieve_command *ctx);

/* Metadataexists command
 *
 * Syntax:
 *    metadataexists <mailbox: string> <annotation-names: string-list>
 */

static bool
tst_metadataexists_validate(struct sieve_validator *valdtr,
			    struct sieve_command *tst);
static bool
tst_metadataexists_generate(const struct sieve_codegen_env *cgenv,
			    struct sieve_command *ctx);

const struct sieve_command_def metadataexists_test = {
	.identifier = "metadataexists",
	.type = SCT_TEST,
	.positional_args = 2,
	.subtests = 0,
	.block_allowed = FALSE,
	.block_required = FALSE,
	.validate = tst_metadataexists_validate,
	.generate = tst_metadataexists_generate,
};

/* Servermetadataexists command
 *
 * Syntax:
 *    servermetadataexists <annotation-names: string-list>
 */

const struct sieve_command_def servermetadataexists_test = {
	.identifier = "servermetadataexists",
	.type = SCT_TEST,
	.positional_args = 1,
	.subtests = 0,
	.block_allowed = FALSE,
	.block_required = FALSE,
	.validate = tst_metadataexists_validate,
	.generate = tst_metadataexists_generate,
};

/*
 * Opcode definitions
 */

static bool
tst_metadataexists_operation_dump(const struct sieve_dumptime_env *denv,
				  sieve_size_t *address);
static int
tst_metadataexists_operation_execute(const struct sieve_runtime_env *renv,
				     sieve_size_t *address);

/* Metadata operation */

const struct sieve_operation_def metadataexists_operation = {
	.mnemonic = "METADATAEXISTS",
	.ext_def = &mboxmetadata_extension,
	.code = EXT_METADATA_OPERATION_METADATAEXISTS,
	.dump = tst_metadataexists_operation_dump,
	.execute = tst_metadataexists_operation_execute,
};

/* Mailboxexists operation */

const struct sieve_operation_def servermetadataexists_operation = {
	.mnemonic = "SERVERMETADATAEXISTS",
	.ext_def = &servermetadata_extension,
	.code = EXT_METADATA_OPERATION_METADATAEXISTS,
	.dump = tst_metadataexists_operation_dump,
	.execute = tst_metadataexists_operation_execute,
};

/*
 * Test validation
 */

struct _validate_context {
	struct sieve_validator *valdtr;
	struct sieve_command *tst;
};

static int
tst_metadataexists_annotation_validate(void *context,
				       struct sieve_ast_argument *arg)
{
	struct _validate_context *valctx =
		(struct _validate_context *)context;

	if (sieve_argument_is_string_literal(arg)) {
		const char *aname = sieve_ast_strlist_strc(arg);
		const char *error;

		if (!imap_metadata_verify_entry_name(aname, &error)) {
			sieve_argument_validate_warning(
				valctx->valdtr, arg, "%s test: "
				"specified annotation name `%s' is invalid: %s",
				sieve_command_identifier(valctx->tst),
				str_sanitize(aname, 256),
				sieve_error_from_external(error));
		}
	}
	return 1; /* Can't check at compile time */
}

static bool
tst_metadataexists_validate(struct sieve_validator *valdtr,
			    struct sieve_command *tst)
{
	struct sieve_ast_argument *arg = tst->first_positional;
	struct sieve_ast_argument *aarg; 
	struct _validate_context valctx;
	unsigned int arg_index = 1;

	if (sieve_command_is(tst, metadataexists_test)) {
		if (!sieve_validate_positional_argument(valdtr, tst, arg,
							"mailbox", arg_index++,
							SAAT_STRING))
			return FALSE;

		if (!sieve_validator_argument_activate(valdtr, tst, arg, FALSE))
			return FALSE;

		/* Check name validity when mailbox argument is not a variable */
		if (sieve_argument_is_string_literal(arg)) {
			const char *mailbox = sieve_ast_argument_strc(arg);
			const char *error;

			if (!sieve_mailbox_check_name(mailbox, &error)) {
				sieve_argument_validate_warning(
					valdtr, arg, "%s test: "
					"invalid mailbox name `%s' specified: %s",
					sieve_command_identifier(tst),
					str_sanitize(mailbox, 256), error);
			}
		}
		arg = sieve_ast_argument_next(arg);
	}

	if (!sieve_validate_positional_argument(valdtr, tst, arg,
						"annotation-names", arg_index++,
						SAAT_STRING_LIST))
		return FALSE;
	if (!sieve_validator_argument_activate(valdtr, tst, arg, FALSE))
		return FALSE;

	aarg = arg;
	i_zero(&valctx);
	valctx.valdtr = valdtr;
	valctx.tst = tst;

	return (sieve_ast_stringlist_map(
		&aarg, (void*)&valctx,
		tst_metadataexists_annotation_validate) >= 0);
}

/*
 * Test generation
 */

static bool
tst_metadataexists_generate(const struct sieve_codegen_env *cgenv,
			    struct sieve_command *tst)
{
	if (sieve_command_is(tst, metadataexists_test)) {
		sieve_operation_emit(cgenv->sblock, tst->ext,
				     &metadataexists_operation);
	} else if (sieve_command_is(tst, servermetadataexists_test)) {
		sieve_operation_emit(cgenv->sblock, tst->ext,
				     &servermetadataexists_operation);
	} else {
		i_unreached();
	}

 	/* Generate arguments */
	return sieve_generate_arguments(cgenv, tst, NULL);
}

/*
 * Code dump
 */

static bool
tst_metadataexists_operation_dump(const struct sieve_dumptime_env *denv,
				  sieve_size_t *address)
{
	bool metadata = sieve_operation_is(denv->oprtn,
					   metadataexists_operation);

	if (metadata)
		sieve_code_dumpf(denv, "METADATAEXISTS");
	else
		sieve_code_dumpf(denv, "SERVERMETADATAEXISTS");

	sieve_code_descend(denv);

	if (metadata && !sieve_opr_string_dump(denv, address, "mailbox"))
		return FALSE;

	return sieve_opr_stringlist_dump(denv, address, "annotation-names");
}

/*
 * Code execution
 */

static int
tst_metadataexists_check_annotation(const struct sieve_runtime_env *renv,
				    struct imap_metadata_transaction *imtrans,
				    const char *mailbox, const char *aname,
				    bool *all_exist_r)
{
	struct mail_attribute_value avalue;
	const char *error;
	int ret;

	if (!imap_metadata_verify_entry_name(aname, &error)) {
		sieve_runtime_warning(
			renv, NULL, "%s test: "
			"specified annotation name `%s' is invalid: %s",
			(mailbox != NULL ?
			 "metadataexists" : "servermetadataexists"),
			str_sanitize(aname, 256),
			sieve_error_from_external(error));
		*all_exist_r = FALSE;
		return SIEVE_EXEC_OK;
	}

	ret = imap_metadata_get(imtrans, aname, &avalue);
	if (ret < 0) {
		enum mail_error error_code;
		const char *error;

		error = imap_metadata_transaction_get_last_error(
			imtrans, &error_code);
		sieve_runtime_error(
			renv, NULL, "%s test: "
			"failed to retrieve annotation `%s': %s%s",
			(mailbox != NULL ?
			 "metadataexists" : "servermetadataexists"),
			str_sanitize(aname, 256),
			sieve_error_from_external(error),
			(error_code == MAIL_ERROR_TEMP ?
			 " (temporary failure)" : ""));

		*all_exist_r = FALSE;
		return (error_code == MAIL_ERROR_TEMP ?
			SIEVE_EXEC_TEMP_FAILURE : SIEVE_EXEC_FAILURE);
	}
	if (avalue.value == NULL && avalue.value_stream == NULL) {
		sieve_runtime_trace(renv, 0,
				    "annotation `%s': not found", aname);
		*all_exist_r = FALSE;
	}

	sieve_runtime_trace(renv, 0, "annotation `%s': found", aname);
	return SIEVE_EXEC_OK;
}

static int
tst_metadataexists_check_annotations(const struct sieve_runtime_env *renv,
				     const char *mailbox,
				     struct sieve_stringlist *anames,
				     bool *all_exist_r)
{
	const struct sieve_execute_env *eenv = renv->exec_env;
	struct mail_user *user = eenv->scriptenv->user;
	struct mailbox *box = NULL;
	struct imap_metadata_transaction *imtrans;
	string_t *aname;
	bool all_exist = TRUE;
	int ret, sret, status;

	*all_exist_r = FALSE;

	if (user == NULL)
		return SIEVE_EXEC_OK;

	if (mailbox != NULL) {
		struct mail_namespace *ns;
		ns = mail_namespace_find(user->namespaces, mailbox);
		box = mailbox_alloc(ns->list, mailbox, 0);
		imtrans = imap_metadata_transaction_begin(box);
	} else {
		imtrans = imap_metadata_transaction_begin_server(user);
	}

	if (mailbox != NULL) {
		sieve_runtime_trace(
			renv, SIEVE_TRLVL_TESTS,
			"checking annotations of mailbox `%s':",
			str_sanitize(mailbox, 80));
	} else {
		sieve_runtime_trace(
			renv, SIEVE_TRLVL_TESTS,
			"checking server annotations");
	}

	aname = NULL;
	status = SIEVE_EXEC_OK;
	while (all_exist &&
	       (sret = sieve_stringlist_next_item(anames, &aname)) > 0) {
		ret = tst_metadataexists_check_annotation(
			renv, imtrans, mailbox, str_c(aname), &all_exist);
		if (ret <= 0) {
			status = ret;
			break;
		}
	}

	if (sret < 0) {
		sieve_runtime_trace_error(
			renv, "invalid annotation name stringlist item");
		status = SIEVE_EXEC_BIN_CORRUPT;
	}

	(void)imap_metadata_transaction_commit(&imtrans, NULL, NULL);
	if (box != NULL)
		mailbox_free(&box);

	*all_exist_r = all_exist;
	return status;
}

static int
tst_metadataexists_operation_execute(const struct sieve_runtime_env *renv,
				     sieve_size_t *address)
{
	bool metadata = sieve_operation_is(renv->oprtn,
					   metadataexists_operation);
	struct sieve_stringlist *anames;
	string_t *mailbox;
	bool trace = FALSE, all_exist = TRUE;
	const char *error;
	int ret;

	/*
	 * Read operands
	 */

	/* Read mailbox */
	if (metadata) {
		ret = sieve_opr_string_read(renv, address, "mailbox", &mailbox);
		if (ret <= 0)
			return ret;
	}

	/* Read annotation names */
	ret = sieve_opr_stringlist_read(renv, address, "annotation-names",
					&anames);
	if (ret <= 0)
		return ret;

	/*
	 * Perform operation
	 */

	if (metadata &&
	    !sieve_mailbox_check_name(str_c(mailbox), &error)) {
		sieve_runtime_warning(
			renv, NULL, "metadataexists test: "
			"invalid mailbox name `%s' specified: %s",
			str_sanitize(str_c(mailbox), 256), error);
		sieve_interpreter_set_test_result(renv->interp, FALSE);
		return SIEVE_EXEC_OK;
	}

	if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_TESTS)) {
		if (metadata) {
			sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
					    "metadataexists test");
		} else {
			sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
					    "servermetadataexists test");
		}

		sieve_runtime_trace_descend(renv);

		trace = sieve_runtime_trace_active(renv, SIEVE_TRLVL_MATCHING);
	}

	ret = tst_metadataexists_check_annotations(
		renv, (metadata ? str_c(mailbox) : NULL), anames, &all_exist);
	if (ret <= 0)
		return ret;

	if (trace) {
		if (all_exist) {
			sieve_runtime_trace(renv, 0,
					    "all annotations exist");
		} else {
			sieve_runtime_trace(renv, 0,
					    "some annotations do not exist");
		}
	}

	sieve_interpreter_set_test_result(renv->interp, all_exist);
	return SIEVE_EXEC_OK;
}