Quelle mod_dav.h Sprache: C

/* 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          "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 "-//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     "\n\n

"
#define DAV_RESPONSE_BODY_3 "

"
#define DAV_RESPONSE_BODY_4 "

\n"
#define DAV_RESPONSE_BODY_5     "\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);

/*
** If DavBasePath is configured for the request location, return the
** configured path, otherwise NULL.
*/
DAV_DECLARE(const char *) dav_get_base_path(request_rec *r);

/* --------------------------------------------------------------------
**
** 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
**
--> --------------------

--> maximum size reached

--> --------------------

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