/* 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. */ /* ** DAV extension module for Apache 2.0.* ** - Property database handling (repository-independent) ** ** NOTES: ** ** PROPERTY DATABASE ** ** This version assumes that there is a per-resource database provider ** to record properties. The database provider decides how and where to ** store these databases. ** ** The DBM keys for the properties have the following form: ** ** namespace ":" propname ** ** For example: 5:author ** ** The namespace provides an integer index into the namespace table ** (see below). propname is simply the property name, without a namespace ** prefix. ** ** A special case exists for properties that had a prefix starting with ** "xml". The XML Specification reserves these for future use. mod_dav ** stores and retrieves them unchanged. The keys for these properties ** have the form: ** ** ":" propname ** ** The propname will contain the prefix and the property name. For ** example, a key might be ":xmlfoo:name" ** ** The ":name" style will also be used for properties that do not ** exist within a namespace. ** ** The DBM values consist of two null-terminated strings, appended ** together (the null-terms are retained and stored in the database). ** The first string is the xml:lang value for the property. An empty ** string signifies that a lang value was not in context for the value. ** The second string is the property value itself. ** ** ** NAMESPACE TABLE ** ** The namespace table is an array that lists each of the namespaces ** that are in use by the properties in the given propdb. Each entry ** in the array is a simple URI. ** ** For example: http://www.foo.bar/standards/props/ ** ** The prefix used for the property is stripped and the URI for it ** is entered into the namespace table. Also, any namespaces used ** within the property value will be entered into the table (and ** stripped from the child elements). ** ** The namespaces are stored in the DBM database under the "METADATA" key. ** ** ** STRIPPING NAMESPACES ** ** Within the property values, the namespace declarations (xmlns...) ** are stripped. Each element and attribute will have its prefix removed ** and a new prefix inserted. ** ** This must be done so that we can return multiple properties in a ** PROPFIND which may have (originally) used conflicting prefixes. For ** that case, we must bind all property value elements to new namespace ** values. ** ** This implies that clients must NOT be sensitive to the namespace ** prefix used for their properties. It WILL change when the properties ** are returned (we return them as "ns<index>", e.g. "ns5"). Also, the ** property value can contain ONLY XML elements and CDATA. PI and comment ** elements will be stripped. CDATA whitespace will be preserved, but ** whitespace within element tags will be altered. Attribute ordering ** may be altered. Element and CDATA ordering will be preserved. ** ** ** ATTRIBUTES ON PROPERTY NAME ELEMENTS ** ** When getting/setting properties, the XML used looks like: ** ** <prop> ** <propname1>value</propname1> ** <propname2>value</propname1> ** </prop> ** ** This implementation (mod_dav) DOES NOT save any attributes that are ** associated with the <propname1> element. The property value is deemed ** to be only the contents ("value" in the above example). ** ** We do store the xml:lang value (if any) that applies to the context ** of the <propname1> element. Whether the xml:lang attribute is on ** <propname1> itself, or from a higher level element, we will store it ** with the property value. ** ** ** VERSIONING ** ** The DBM db contains a key named "METADATA" that holds database-level ** information, such as the namespace table. The record also contains the ** db's version number as the very first 16-bit value. This first number ** is actually stored as two single bytes: the first byte is a "major" ** version number. The second byte is a "minor" number. ** ** If the major number is not what mod_dav expects, then the db is closed ** immediately and an error is returned. A minor number change is ** acceptable -- it is presumed that old/new dav_props.c can deal with ** the database format. For example, a newer dav_props might update the ** minor value and append information to the end of the metadata record ** (which would be ignored by previous versions). ** ** ** ISSUES: ** ** At the moment, for the dav_get_allprops() and dav_get_props() functions, ** we must return a set of xmlns: declarations for ALL known namespaces ** in the file. There isn't a way to filter this because we don't know ** which are going to be used or not. Examining property names is not ** sufficient because the property values could use entirely different ** namespaces. ** ** ==> we must devise a scheme where we can "garbage collect" the namespace ** entries from the property database. */ #include "apr.h" #include "apr_strings.h" #define APR_WANT_STDIO #define APR_WANT_BYTEFUNC #include "apr_want.h" #include "mod_dav.h" #include "http_log.h" #include "http_request.h" /* ** There is some rough support for writable DAV:getcontenttype and ** DAV:getcontentlanguage properties. If this #define is (1), then ** this support is disabled. ** ** We are disabling it because of a lack of support in GET and PUT ** operations. For GET, it would be "expensive" to look for a propdb, ** open it, and attempt to extract the Content-Type and Content-Language ** values for the response. ** (Handling the PUT would not be difficult, though) */ #define DAV_DISABLE_WRITABLE_PROPS 1 #define DAV_EMPTY_VALUE "\0" /* TWO null terms */ struct dav_propdb { apr_pool_t *p; /* the pool we should use */ request_rec *r; /* the request record */ const dav_resource *resource; /* the target resource */ int deferred; /* open of db has been deferred */ dav_db *db; /* underlying database containing props */ apr_array_header_t *ns_xlate; /* translation of an elem->ns to URI */ dav_namespace_map *mapping; /* namespace mapping */ dav_lockdb *lockdb; /* the lock database */ dav_buffer wb_lock; /* work buffer for lockdiscovery property */ /* if we ever run a GET subreq, it will be stored here */ request_rec *subreq; /* hooks we should use for processing (based on the target resource) */ const dav_hooks_db *db_hooks; }; /* NOTE: dav_core_props[] and the following enum must stay in sync. */ /* ### move these into a "core" liveprop provider? */ static const char * const dav_core_props[] = { "getcontenttype", "getcontentlanguage", "lockdiscovery", "supportedlock", NULL /* sentinel */ }; enum { DAV_PROPID_CORE_getcontenttype = DAV_PROPID_CORE, DAV_PROPID_CORE_getcontentlanguage, DAV_PROPID_CORE_lockdiscovery, DAV_PROPID_CORE_supportedlock, DAV_PROPID_CORE_UNKNOWN }; /* ** This structure is used to track information needed for a rollback. */ typedef struct dav_rollback_item { /* select one of the two rollback context structures based on the value of dav_prop_ctx.is_liveprop */ dav_deadprop_rollback *deadprop; dav_liveprop_rollback *liveprop; } dav_rollback_item; static int dav_find_liveprop_provider(dav_propdb *propdb, const char *ns_uri, const char *propname, const dav_hooks_liveprop **provider) { int propid; *provider = NULL; if (ns_uri == NULL) { /* policy: liveprop providers cannot define no-namespace properties */ return DAV_PROPID_CORE_UNKNOWN; } /* check liveprop providers first, so they can define core properties */ propid = dav_run_find_liveprop(propdb->resource, ns_uri, propname, provider); if (propid != 0) { return propid; } /* check for core property */ if (strcmp(ns_uri, "DAV:") == 0) { const char * const *p = dav_core_props; for (propid = DAV_PROPID_CORE; *p != NULL; ++p, ++propid) if (strcmp(propname, *p) == 0) { return propid; } } /* no provider for this property */ return DAV_PROPID_CORE_UNKNOWN; } static void dav_find_liveprop(dav_propdb *propdb, apr_xml_elem *elem) { const char *ns_uri; dav_elem_private *priv = elem->priv; const dav_hooks_liveprop *hooks; if (elem->ns == APR_XML_NS_NONE) ns_uri = NULL; else if (elem->ns == APR_XML_NS_DAV_ID) ns_uri = "DAV:"; else ns_uri = APR_XML_GET_URI_ITEM(propdb->ns_xlate, elem->ns); priv->propid = dav_find_liveprop_provider(propdb, ns_uri, elem->name, &hooks); /* ### this test seems redundant... */ if (priv->propid != DAV_PROPID_CORE_UNKNOWN) { priv->provider = hooks; } } /* is the live property read/write? */ static int dav_rw_liveprop(dav_propdb *propdb, dav_elem_private *priv) { int propid = priv->propid; /* ** Check the liveprop provider (if this is a provider-defined prop) */ if (priv->provider != NULL) { return (*priv->provider->is_writable)(propdb->resource, propid); } /* these are defined as read-only */ if (propid == DAV_PROPID_CORE_lockdiscovery #if DAV_DISABLE_WRITABLE_PROPS || propid == DAV_PROPID_CORE_getcontenttype || propid == DAV_PROPID_CORE_getcontentlanguage #endif || propid == DAV_PROPID_CORE_supportedlock ) { return 0; } /* these are defined as read/write */ if (propid == DAV_PROPID_CORE_getcontenttype || propid == DAV_PROPID_CORE_getcontentlanguage || propid == DAV_PROPID_CORE_UNKNOWN) { return 1; } /* ** We don't recognize the property, so it must be dead (and writable) */ return 1; } /* do a sub-request to fetch properties for the target resource's URI. */ static void dav_do_prop_subreq(dav_propdb *propdb) { /* perform a "GET" on the resource's URI (note that the resource may not correspond to the current request!). */ propdb->subreq = ap_sub_req_lookup_uri(propdb->resource->uri, propdb->r, NULL); } static dav_error * dav_insert_coreprop(dav_propdb *propdb, int propid, const char *name, dav_prop_insert what, apr_text_header *phdr, dav_prop_insert *inserted) { const char *value = NULL; dav_error *err; *inserted = DAV_PROP_INSERT_NOTDEF; /* fast-path the common case */ if (propid == DAV_PROPID_CORE_UNKNOWN) return NULL; switch (propid) { case DAV_PROPID_CORE_lockdiscovery: if (propdb->lockdb != NULL) { dav_lock *locks; if ((err = dav_lock_query(propdb->lockdb, propdb->resource, &locks)) != NULL) { return dav_push_error(propdb->p, err->status, 0, "DAV:lockdiscovery could not be " "determined due to a problem fetching " "the locks for this resource.", err); } /* fast-path the no-locks case */ if (locks == NULL) { value = ""; } else { /* ** This may modify the buffer. value may point to ** wb_lock.pbuf or a string constant. */ value = dav_lock_get_activelock(propdb->r, locks, &propdb->wb_lock); /* make a copy to isolate it from changes to wb_lock */ value = apr_pstrdup(propdb->p, propdb->wb_lock.buf); } } break; case DAV_PROPID_CORE_supportedlock: if (propdb->lockdb != NULL) { value = (*propdb->lockdb->hooks->get_supportedlock)(propdb->resource); } break; case DAV_PROPID_CORE_getcontenttype: if (propdb->subreq == NULL) { dav_do_prop_subreq(propdb); } if (propdb->subreq->content_type != NULL) { value = propdb->subreq->content_type; } break; case DAV_PROPID_CORE_getcontentlanguage: { const char *lang; if (propdb->subreq == NULL) { dav_do_prop_subreq(propdb); } if ((lang = apr_table_get(propdb->subreq->headers_out, "Content-Language")) != NULL) { value = lang; } break; } default: /* fall through to interpret as a dead property */ break; } /* if something was supplied, then insert it */ if (value != NULL) { const char *s; if (what == DAV_PROP_INSERT_SUPPORTED) { /* use D: prefix to refer to the DAV: namespace URI, * and let the namespace attribute default to "DAV:" */ s = apr_psprintf(propdb->p, "<D:supported-live-property D:name=\"%s\"/>" DEBUG_CR, name); } else if (what == DAV_PROP_INSERT_VALUE && *value != '\0') { /* use D: prefix to refer to the DAV: namespace URI */ s = apr_psprintf(propdb->p, "<D:%s>%s</D:%s>" DEBUG_CR, name, value, name); } else { /* use D: prefix to refer to the DAV: namespace URI */ s = apr_psprintf(propdb->p, "<D:%s/>" DEBUG_CR, name); } apr_text_append(propdb->p, phdr, s); *inserted = what; } return NULL; } static dav_error * dav_insert_liveprop(dav_propdb *propdb, const apr_xml_elem *elem, dav_prop_insert what, apr_text_header *phdr, dav_prop_insert *inserted) { dav_elem_private *priv = elem->priv; *inserted = DAV_PROP_INSERT_NOTDEF; if (priv->provider == NULL) { /* this is a "core" property that we define */ return dav_insert_coreprop(propdb, priv->propid, elem->name, what, phdr, inserted); } /* ask the provider (that defined this prop) to insert the prop */ *inserted = (*priv->provider->insert_prop)(propdb->resource, priv->propid, what, phdr); return NULL; } static void dav_output_prop_name(apr_pool_t *pool, const dav_prop_name *name, dav_xmlns_info *xi, apr_text_header *phdr) { const char *s; if (*name->ns == '\0') s = apr_psprintf(pool, "<%s/>" DEBUG_CR, name->name); else { const char *prefix = dav_xmlns_add_uri(xi, name->ns); s = apr_psprintf(pool, "<%s:%s/>" DEBUG_CR, prefix, name->name); } apr_text_append(pool, phdr, s); } static void dav_insert_xmlns(apr_pool_t *p, const char *pre_prefix, long ns, const char *ns_uri, apr_text_header *phdr) { const char *s; s = apr_psprintf(p, " xmlns:%s%ld=\"%s\"", pre_prefix, ns, ns_uri); apr_text_append(p, phdr, s); } static dav_error *dav_really_open_db(dav_propdb *propdb, int ro) { dav_error *err; /* we're trying to open the db; turn off the 'deferred' flag */ propdb->deferred = 0; /* ask the DB provider to open the thing */ err = (*propdb->db_hooks->open)(propdb->p, propdb->resource, ro, &propdb->db); if (err != NULL) { return dav_push_error(propdb->p, HTTP_INTERNAL_SERVER_ERROR, DAV_ERR_PROP_OPENING, "Could not open the property database.", err); } /* ** NOTE: propdb->db could be NULL if we attempted to open a readonly ** database that doesn't exist. If we require read/write ** access, then a database was created and opened. */ return NULL; } DAV_DECLARE(dav_error *)dav_open_propdb(request_rec *r, dav_lockdb *lockdb, const dav_resource *resource, int ro, apr_array_header_t * ns_xlate, dav_propdb **p_propdb) { dav_propdb *propdb = apr_pcalloc(r->pool, sizeof(*propdb)); *p_propdb = NULL; #if DAV_DEBUG if (resource->uri == NULL) { return dav_new_error(r->pool, HTTP_INTERNAL_SERVER_ERROR, 0, "INTERNAL DESIGN ERROR: resource must define " "its URI."); } #endif propdb->r = r; apr_pool_create(&propdb->p, r->pool); propdb->resource = resource; propdb->ns_xlate = ns_xlate; propdb->db_hooks = DAV_GET_HOOKS_PROPDB(r); propdb->lockdb = lockdb; /* always defer actual open, to avoid expense of accessing db * when only live properties are involved */ propdb->deferred = 1; /* ### what to do about closing the propdb on server failure? */ *p_propdb = propdb; return NULL; } DAV_DECLARE(void) dav_close_propdb(dav_propdb *propdb) { if (propdb->db != NULL) { (*propdb->db_hooks->close)(propdb->db); } /* Currently, mod_dav's pool usage doesn't allow clearing this pool. */ #if 0 apr_pool_destroy(propdb->p); #endif return; } DAV_DECLARE(dav_get_props_result) dav_get_allprops(dav_propdb *propdb, dav_prop_insert what) { const dav_hooks_db *db_hooks = propdb->db_hooks; apr_text_header hdr = { 0 }; apr_text_header hdr_ns = { 0 }; dav_get_props_result result = { 0 }; int found_contenttype = 0; int found_contentlang = 0; dav_prop_insert unused_inserted; /* if not just getting supported live properties, * scan all properties in the dead prop database */ if (what != DAV_PROP_INSERT_SUPPORTED) { if (propdb->deferred) { /* ### what to do with db open error? */ (void) dav_really_open_db(propdb, 1 /*ro*/); } /* initialize the result with some start tags... */ apr_text_append(propdb->p, &hdr, "<D:propstat>" DEBUG_CR "<D:prop>" DEBUG_CR); /* if there ARE properties, then scan them */ if (propdb->db != NULL) { dav_xmlns_info *xi = dav_xmlns_create(propdb->p); dav_prop_name name; /* define (up front) any namespaces the db might need */ (void) (*db_hooks->define_namespaces)(propdb->db, xi); /* get the first property name, beginning the scan */ (void) (*db_hooks->first_name)(propdb->db, &name); while (name.ns != NULL) { /* ** We also look for <DAV:getcontenttype> and ** <DAV:getcontentlanguage>. If they are not stored as dead ** properties, then we need to perform a subrequest to get ** their values (if any). */ if (*name.ns == 'D' && strcmp(name.ns, "DAV:") == 0 && *name.name == 'g') { if (strcmp(name.name, "getcontenttype") == 0) { found_contenttype = 1; } else if (strcmp(name.name, "getcontentlanguage") == 0) { found_contentlang = 1; } } if (what == DAV_PROP_INSERT_VALUE) { dav_error *err; int found; if ((err = (*db_hooks->output_value)(propdb->db, &name, xi, &hdr, &found)) != NULL) { /* ### anything better to do? */ /* ### probably should enter a 500 error */ goto next_key; } /* assert: found == 1 */ } else { /* the value was not requested, so just add an empty tag specifying the property name. */ dav_output_prop_name(propdb->p, &name, xi, &hdr); } next_key: (void) (*db_hooks->next_name)(propdb->db, &name); } /* all namespaces have been entered into xi. generate them into the output now. */ dav_xmlns_generate(xi, &hdr_ns); } /* propdb->db != NULL */ /* add namespaces for all the liveprop providers */ dav_add_all_liveprop_xmlns(propdb->p, &hdr_ns); } /* ask the liveprop providers to insert their properties */ dav_run_insert_all_liveprops(propdb->r, propdb->resource, what, &hdr); /* insert the standard properties */ /* ### should be handling the return errors here */ (void)dav_insert_coreprop(propdb, DAV_PROPID_CORE_supportedlock, "supportedlock", what, &hdr, &unused_inserted); (void)dav_insert_coreprop(propdb, DAV_PROPID_CORE_lockdiscovery, "lockdiscovery", what, &hdr, &unused_inserted); /* if we didn't find these, then do the whole subreq thing. */ if (!found_contenttype) { /* ### should be handling the return error here */ (void)dav_insert_coreprop(propdb, DAV_PROPID_CORE_getcontenttype, "getcontenttype", what, &hdr, &unused_inserted); } if (!found_contentlang) { /* ### should be handling the return error here */ (void)dav_insert_coreprop(propdb, DAV_PROPID_CORE_getcontentlanguage, "getcontentlanguage", what, &hdr, &unused_inserted); } /* if not just reporting on supported live props, * terminate the result */ if (what != DAV_PROP_INSERT_SUPPORTED) { apr_text_append(propdb->p, &hdr, "</D:prop>" DEBUG_CR "<D:status>HTTP/1.1 200 OK</D:status>" DEBUG_CR "</D:propstat>" DEBUG_CR); } result.propstats = hdr.first; result.xmlns = hdr_ns.first; return result; } DAV_DECLARE(dav_get_props_result) dav_get_props(dav_propdb *propdb, apr_xml_doc *doc) { const dav_hooks_db *db_hooks = propdb->db_hooks; apr_xml_elem *elem = dav_find_child(doc->root, "prop"); apr_text_header hdr_good = { 0 }; apr_text_header hdr_bad = { 0 }; apr_text_header hdr_ns = { 0 }; int have_good = 0; dav_get_props_result result = { 0 }; char *marks_liveprop; dav_xmlns_info *xi; int xi_filled = 0; /* ### NOTE: we should pass in TWO buffers -- one for keys, one for the marks */ /* we will ALWAYS provide a "good" result, even if it is EMPTY */ apr_text_append(propdb->p, &hdr_good, "<D:propstat>" DEBUG_CR "<D:prop>" DEBUG_CR); /* ### the marks should be in a buffer! */ /* allocate zeroed-memory for the marks. These marks indicate which liveprop namespaces we've generated into the output xmlns buffer */ /* same for the liveprops */ marks_liveprop = apr_pcalloc(propdb->p, dav_get_liveprop_ns_count() + 1); xi = dav_xmlns_create(propdb->p); for (elem = elem->first_child; elem; elem = elem->next) { dav_elem_private *priv; dav_error *err; dav_prop_insert inserted; dav_prop_name name; /* ** First try live property providers; if they don't handle ** the property, then try looking it up in the propdb. */ if (elem->priv == NULL) { elem->priv = apr_pcalloc(propdb->p, sizeof(*priv)); } priv = elem->priv; /* cache the propid; dav_get_props() could be called many times */ if (priv->propid == 0) dav_find_liveprop(propdb, elem); if (priv->propid != DAV_PROPID_CORE_UNKNOWN) { /* insert the property. returns 1 if an insertion was done. */ if ((err = dav_insert_liveprop(propdb, elem, DAV_PROP_INSERT_VALUE, &hdr_good, &inserted)) != NULL) { /* ### need to propagate the error to the caller... */ /* ### skip it for now, as if nothing was inserted */ } if (inserted == DAV_PROP_INSERT_VALUE) { have_good = 1; /* ** Add the liveprop's namespace URIs. Note that provider==NULL ** for core properties. */ if (priv->provider != NULL) { const char * const * scan_ns_uri; for (scan_ns_uri = priv->provider->namespace_uris; *scan_ns_uri != NULL; ++scan_ns_uri) { long ns; ns = dav_get_liveprop_ns_index(*scan_ns_uri); if (marks_liveprop[ns]) continue; marks_liveprop[ns] = 1; dav_insert_xmlns(propdb->p, "lp", ns, *scan_ns_uri, &hdr_ns); } } /* property added. move on to the next property. */ continue; } else if (inserted == DAV_PROP_INSERT_NOTDEF) { /* nothing to do. fall thru to allow property to be handled as a dead property */ } #if DAV_DEBUG else { #if 0 /* ### need to change signature to return an error */ return dav_new_error(propdb->p, HTTP_INTERNAL_SERVER_ERROR, 0, "INTERNAL DESIGN ERROR: insert_liveprop " "did not insert what was asked for."); #endif } #endif } /* The property wasn't a live property, so look in the dead property database. */ /* make sure propdb is really open */ if (propdb->deferred) { /* ### what to do with db open error? */ (void) dav_really_open_db(propdb, 1 /*ro*/); } if (elem->ns == APR_XML_NS_NONE) name.ns = ""; else name.ns = APR_XML_GET_URI_ITEM(propdb->ns_xlate, elem->ns); name.name = elem->name; /* only bother to look if a database exists */ if (propdb->db != NULL) { int found; if ((err = (*db_hooks->output_value)(propdb->db, &name, xi, &hdr_good, &found)) != NULL) { /* ### what to do? continue doesn't seem right... */ continue; } if (found) { have_good = 1; /* if we haven't added the db's namespaces, then do so... */ if (!xi_filled) { (void) (*db_hooks->define_namespaces)(propdb->db, xi); xi_filled = 1; } continue; } } /* not found as a live OR dead property. add a record to the "bad" propstats */ /* make sure we've started our "bad" propstat */ if (hdr_bad.first == NULL) { apr_text_append(propdb->p, &hdr_bad, "<D:propstat>" DEBUG_CR "<D:prop>" DEBUG_CR); } /* output this property's name (into the bad propstats) */ dav_output_prop_name(propdb->p, &name, xi, &hdr_bad); } apr_text_append(propdb->p, &hdr_good, "</D:prop>" DEBUG_CR "<D:status>HTTP/1.1 200 OK</D:status>" DEBUG_CR "</D:propstat>" DEBUG_CR); /* default to start with the good */ result.propstats = hdr_good.first; /* we may not have any "bad" results */ if (hdr_bad.first != NULL) { /* "close" the bad propstat */ apr_text_append(propdb->p, &hdr_bad, "</D:prop>" DEBUG_CR "<D:status>HTTP/1.1 404 Not Found</D:status>" DEBUG_CR "</D:propstat>" DEBUG_CR); /* if there are no good props, then just return the bad */ if (!have_good) { result.propstats = hdr_bad.first; } else { /* hook the bad propstat to the end of the good one */ hdr_good.last->next = hdr_bad.first; } } /* add in all the various namespaces, and return them */ dav_xmlns_generate(xi, &hdr_ns); result.xmlns = hdr_ns.first; return result; } DAV_DECLARE(void) dav_get_liveprop_supported(dav_propdb *propdb, const char *ns_uri, const char *propname, apr_text_header *body) { int propid; const dav_hooks_liveprop *hooks; propid = dav_find_liveprop_provider(propdb, ns_uri, propname, &hooks); if (propid != DAV_PROPID_CORE_UNKNOWN) { if (hooks == NULL) { /* this is a "core" property that we define */ dav_prop_insert unused_inserted; dav_insert_coreprop(propdb, propid, propname, DAV_PROP_INSERT_SUPPORTED, body, &unused_inserted); } else { (*hooks->insert_prop)(propdb->resource, propid, DAV_PROP_INSERT_SUPPORTED, body); } } } DAV_DECLARE_NONSTD(void) dav_prop_validate(dav_prop_ctx *ctx) { dav_propdb *propdb = ctx->propdb; apr_xml_elem *prop = ctx->prop; dav_elem_private *priv; priv = ctx->prop->priv = apr_pcalloc(propdb->p, sizeof(*priv)); /* ** Check to see if this is a live property, and fill the fields ** in the XML elem, as appropriate. ** ** Verify that the property is read/write. If not, then it cannot ** be SET or DELETEd. */ if (priv->propid == 0) { dav_find_liveprop(propdb, prop); /* it's a liveprop if a provider was found */ /* ### actually the "core" props should really be liveprops, but ### there is no "provider" for those and the r/w props are ### treated as dead props anyhow */ ctx->is_liveprop = priv->provider != NULL; } if (!dav_rw_liveprop(propdb, priv)) { ctx->err = dav_new_error(propdb->p, HTTP_CONFLICT, DAV_ERR_PROP_READONLY, "Property is read-only."); return; } if (ctx->is_liveprop) { int defer_to_dead = 0; ctx->err = (*priv->provider->patch_validate)(propdb->resource, prop, ctx->operation, &ctx->liveprop_ctx, &defer_to_dead); if (ctx->err != NULL || !defer_to_dead) return; /* clear is_liveprop -- act as a dead prop now */ ctx->is_liveprop = 0; } /* ** The property is supposed to be stored into the dead-property ** database. Make sure the thing is truly open (and writable). */ if (propdb->deferred && (ctx->err = dav_really_open_db(propdb, 0 /* ro */)) != NULL) { return; } /* ** There should be an open, writable database in here! ** ** Note: the database would be NULL if it was opened readonly and it ** did not exist. */ if (propdb->db == NULL) { ctx->err = dav_new_error(propdb->p, HTTP_INTERNAL_SERVER_ERROR, DAV_ERR_PROP_NO_DATABASE, "Attempted to set/remove a property " "without a valid, open, read/write " "property database."); return; } if (ctx->operation == DAV_PROP_OP_SET) { /* ** Prep the element => propdb namespace index mapping, inserting ** namespace URIs into the propdb that don't exist. */ (void) (*propdb->db_hooks->map_namespaces)(propdb->db, propdb->ns_xlate, &propdb->mapping); } else if (ctx->operation == DAV_PROP_OP_DELETE) { /* ** There are no checks to perform here. If a property exists, then ** we will delete it. If it does not exist, then it does not matter ** (see S12.13.1). ** ** Note that if a property does not exist, that does not rule out ** that a SET will occur during this PROPPATCH (thusly creating it). */ } } DAV_DECLARE_NONSTD(void) dav_prop_exec(dav_prop_ctx *ctx) { dav_propdb *propdb = ctx->propdb; dav_error *err = NULL; dav_elem_private *priv = ctx->prop->priv; ctx->rollback = apr_pcalloc(propdb->p, sizeof(*ctx->rollback)); if (ctx->is_liveprop) { err = (*priv->provider->patch_exec)(propdb->resource, ctx->prop, ctx->operation, ctx->liveprop_ctx, &ctx->rollback->liveprop); } else { dav_prop_name name; if (ctx->prop->ns == APR_XML_NS_NONE) name.ns = ""; else name.ns = APR_XML_GET_URI_ITEM(propdb->ns_xlate, ctx->prop->ns); name.name = ctx->prop->name; /* save the old value so that we can do a rollback. */ if ((err = (*propdb->db_hooks ->get_rollback)(propdb->db, &name, &ctx->rollback->deadprop)) != NULL) goto error; if (ctx->operation == DAV_PROP_OP_SET) { /* Note: propdb->mapping was set in dav_prop_validate() */ err = (*propdb->db_hooks->store)(propdb->db, &name, ctx->prop, propdb->mapping); /* ** If an error occurred, then assume that we didn't change the ** value. Remove the rollback item so that we don't try to set ** its value during the rollback. */ /* ### euh... where is the removal? */ } else if (ctx->operation == DAV_PROP_OP_DELETE) { /* ** Delete the property. Ignore errors -- the property is there, or ** we are deleting it for a second time. */ /* ### but what about other errors? */ (void) (*propdb->db_hooks->remove)(propdb->db, &name); } } error: /* push a more specific error here */ if (err != NULL) { /* ** Use HTTP_INTERNAL_SERVER_ERROR because we shouldn't have seen ** any errors at this point. */ ctx->err = dav_push_error(propdb->p, HTTP_INTERNAL_SERVER_ERROR, DAV_ERR_PROP_EXEC, "Could not execute PROPPATCH.", err); } } DAV_DECLARE_NONSTD(void) dav_prop_commit(dav_prop_ctx *ctx) { dav_elem_private *priv = ctx->prop->priv; /* ** Note that a commit implies ctx->err is NULL. The caller should assume ** a status of HTTP_OK for this case. */ if (ctx->is_liveprop) { (*priv->provider->patch_commit)(ctx->propdb->resource, ctx->operation, ctx->liveprop_ctx, ctx->rollback->liveprop); } } DAV_DECLARE_NONSTD(void) dav_prop_rollback(dav_prop_ctx *ctx) { dav_error *err = NULL; dav_elem_private *priv = ctx->prop->priv; /* do nothing if there is no rollback information. */ if (ctx->rollback == NULL) return; /* ** ### if we have an error, and a rollback occurs, then the namespace ** ### mods should not happen at all. Basically, the namespace management ** ### is simply a bitch. */ if (ctx->is_liveprop) { err = (*priv->provider->patch_rollback)(ctx->propdb->resource, ctx->operation, ctx->liveprop_ctx, ctx->rollback->liveprop); } else { err = (*ctx->propdb->db_hooks ->apply_rollback)(ctx->propdb->db, ctx->rollback->deadprop); } if (err != NULL) { if (ctx->err == NULL) ctx->err = err; else { dav_error *scan = err; /* hook previous errors at the end of the rollback error */ while (scan->prev != NULL) scan = scan->prev; scan->prev = ctx->err; ctx->err = err; } } }
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