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apache / httpd / f83672781de25207442ff908258219de1d103062 / . / modules / dav / main / props.c
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/* ====================================================================
* The Apache Software License, Version 1.1
*
* Copyright (c) 2000-2001 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Apache" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
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*
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*
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* ====================================================================
*
* This software consists of voluntary contributions made by many
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* information on the Apache Software Foundation, please see
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/*
** 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_GDBM_NS_KEY "METADATA"
#define DAV_GDBM_NS_KEY_LEN 8
#define DAV_EMPTY_VALUE "\0" /* TWO null terms */
/* the namespace URI was not found; no ID is available */
#define AP_XML_NS_ERROR_NOT_FOUND (AP_XML_NS_ERROR_BASE)
typedef struct {
unsigned char major;
#define DAV_DBVSN_MAJOR 4
/*
** V4 -- 0.9.9 ..
** Prior versions could have keys or values with invalid
** namespace prefixes as a result of the xmlns="" form not
** resetting the default namespace to be "no namespace". The
** namespace would be set to "" which is invalid; it should
** be set to "no namespace".
**
** V3 -- 0.9.8
** Prior versions could have values with invalid namespace
** prefixes due to an incorrect mapping of input to propdb
** namespace indices. Version bumped to obsolete the old
** values.
**
** V2 -- 0.9.7
** This introduced the xml:lang value into the property value's
** record in the propdb.
**
** V1 -- .. 0.9.6
** Initial version.
*/
unsigned char minor;
#define DAV_DBVSN_MINOR 0
short ns_count;
} dav_propdb_metadata;
struct dav_propdb {
int version; /* *minor* version of this db */
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 */
dav_buffer ns_table; /* table of namespace URIs */
short ns_count; /* number of entries in table */
int ns_table_dirty; /* ns_table was modified */
apr_array_header_t *ns_xlate; /* translation of an elem->ns to URI */
int *ns_map; /* map elem->ns to propdb ns values */
int incomplete_map; /* some mappings do not exist */
dav_lockdb *lockdb; /* the lock database */
dav_buffer wb_key; /* work buffer for dav_gdbm_key */
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.
** If a SET was performed and no prior value existed, then value.dptr
** will be NULL.
*/
typedef struct dav_rollback_item {
dav_datum key; /* key for the item being saved */
dav_datum value; /* value before set/replace/delete */
/* or use the following (choice selected by dav_prop_ctx.is_liveprop) */
struct dav_liveprop_rollback *liveprop; /* liveprop rollback ctx */
} dav_rollback_item;
#if 0
/* ### unused */
static const char *dav_get_ns_table_uri(dav_propdb *propdb, int ns)
{
const char *p = propdb->ns_table.buf + sizeof(dav_propdb_metadata);
while (ns--)
p += strlen(p) + 1;
return p;
}
#endif
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, ap_xml_elem *elem)
{
const char *ns_uri;
dav_elem_private *priv = elem->private;
const dav_hooks_liveprop *hooks;
if (elem->ns == AP_XML_NS_NONE)
ns_uri = NULL;
else if (elem->ns == AP_XML_NS_DAV_ID)
ns_uri = "DAV:";
else
ns_uri = AP_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,
ap_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);
}
ap_text_append(propdb->p, phdr, s);
*inserted = what;
}
return NULL;
}
static dav_error * dav_insert_liveprop(dav_propdb *propdb,
const ap_xml_elem *elem,
dav_prop_insert what,
ap_text_header *phdr,
dav_prop_insert *inserted)
{
dav_elem_private *priv = elem->private;
*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_append_prop(dav_propdb *propdb,
const char *name, const char *value,
ap_text_header *phdr)
{
const char *s;
const char *lang = value;
/* skip past the xml:lang value */
value += strlen(lang) + 1;
if (*value == '\0') {
/* the property is an empty value */
if (*name == ':') {
/* "no namespace" case */
s = apr_psprintf(propdb->p, "<%s/>" DEBUG_CR, name+1);
}
else {
s = apr_psprintf(propdb->p, "<ns%s/>" DEBUG_CR, name);
}
}
else if (*lang != '\0') {
if (*name == ':') {
/* "no namespace" case */
s = apr_psprintf(propdb->p, "<%s xml:lang=\"%s\">%s</%s>" DEBUG_CR,
name+1, lang, value, name+1);
}
else {
s = apr_psprintf(propdb->p, "<ns%s xml:lang=\"%s\">%s</ns%s>" DEBUG_CR,
name, lang, value, name);
}
}
else if (*name == ':') {
/* "no namespace" case */
s = apr_psprintf(propdb->p, "<%s>%s</%s>" DEBUG_CR, name+1, value, name+1);
}
else {
s = apr_psprintf(propdb->p, "<ns%s>%s</ns%s>" DEBUG_CR, name, value, name);
}
ap_text_append(propdb->p, phdr, s);
}
/*
** Prepare the ns_map variable in the propdb structure. This entails copying
** all URIs from the "input" namespace list (in propdb->ns_xlate) into the
** propdb's list of namespaces. As each URI is copied (or pre-existing
** URI looked up), the index mapping is stored into the ns_map variable.
**
** Note: we must copy all declared namespaces because we cannot easily
** determine which input namespaces were actually used within the property
** values that are being stored within the propdb. Theoretically, we can
** determine this at the point where we serialize the property values
** back into strings. This would require a bit more work, and will be
** left to future optimizations.
**
** ### we should always initialize the propdb namespace array with "DAV:"
** ### since we know it will be entered anyhow (by virtue of it always
** ### occurring in the ns_xlate array). That will allow us to use
** ### AP_XML_NS_DAV_ID for propdb ns values, too.
*/
static void dav_prep_ns_map(dav_propdb *propdb, int add_ns)
{
int i;
const char **puri;
const int orig_count = propdb->ns_count;
int *pmap;
int updating = 0; /* are we updating an existing ns_map? */
if (propdb->ns_map) {
if (add_ns && propdb->incomplete_map) {
/* we must revisit the map and insert new entries */
updating = 1;
propdb->incomplete_map = 0;
}
else {
/* nothing to do: we have a proper ns_map */
return;
}
}
else {
propdb->ns_map = apr_palloc(propdb->p, propdb->ns_xlate->nelts * sizeof(*propdb->ns_map));
}
pmap = propdb->ns_map;
/* ### stupid O(n * orig_count) algorithm */
for (i = propdb->ns_xlate->nelts, puri = (const char **)propdb->ns_xlate->elts;
i-- > 0;
++puri, ++pmap) {
const char *uri = *puri;
const size_t uri_len = strlen(uri);
if (updating) {
/* updating an existing mapping... we can skip a lot of stuff */
if (*pmap != AP_XML_NS_ERROR_NOT_FOUND) {
/* This entry has been filled in, so we can skip it */
continue;
}
}
else {
int j;
size_t len;
const char *p;
/*
** GIVEN: uri (a namespace URI from the request input)
**
** FIND: an equivalent URI in the propdb namespace table
*/
/* only scan original entries (we may have added some in here) */
for (p = propdb->ns_table.buf + sizeof(dav_propdb_metadata),
j = 0;
j < orig_count;
++j, p += len + 1) {
len = strlen(p);
if (uri_len != len)
continue;
if (memcmp(uri, p, len) == 0) {
*pmap = j;
goto next_input_uri;
}
}
if (!add_ns) {
*pmap = AP_XML_NS_ERROR_NOT_FOUND;
/*
** This flag indicates that we have an ns_map with missing
** entries. If dav_prep_ns_map() is called with add_ns==1 AND
** this flag is set, then we zip thru the array and add those
** URIs (effectively updating the ns_map as if add_ns=1 was
** passed when the initial prep was called).
*/
propdb->incomplete_map = 1;
continue;
}
}
/*
** The input URI was not found in the propdb namespace table, and
** we are supposed to add it. Append it to the table and store
** the index into the ns_map.
*/
dav_check_bufsize(propdb->p, &propdb->ns_table, uri_len + 1);
memcpy(propdb->ns_table.buf + propdb->ns_table.cur_len, uri, uri_len + 1);
propdb->ns_table.cur_len += uri_len + 1;
propdb->ns_table_dirty = 1;
*pmap = propdb->ns_count++;
next_input_uri:
;
}
}
/* find the "DAV:" namespace in our table and return its ID. */
static int dav_find_dav_id(dav_propdb *propdb)
{
const char *p = propdb->ns_table.buf + sizeof(dav_propdb_metadata);
int ns;
for (ns = 0; ns < propdb->ns_count; ++ns) {
size_t len = strlen(p);
if (len == 4 && memcmp(p, "DAV:", 5) == 0)
return ns;
p += len + 1;
}
/* the "DAV:" namespace is not present */
return -1;
}
static void dav_insert_xmlns(apr_pool_t *p, const char *pre_prefix, int ns,
const char *ns_uri, ap_text_header *phdr)
{
const char *s;
s = apr_psprintf(p, " xmlns:%s%d=\"%s\"", pre_prefix, ns, ns_uri);
ap_text_append(p, phdr, s);
}
/* return all known namespaces (in this propdb) */
static void dav_get_propdb_xmlns(dav_propdb *propdb, ap_text_header *phdr)
{
int i;
const char *p = propdb->ns_table.buf + sizeof(dav_propdb_metadata);
size_t len;
/* note: ns_count == 0 when we have no propdb file */
for (i = 0; i < propdb->ns_count; ++i, p += len + 1) {
len = strlen(p);
dav_insert_xmlns(propdb->p, "ns", i, p, phdr);
}
}
/* add a namespace decl from one of the namespace tables */
static void dav_add_marked_xmlns(dav_propdb *propdb, char *marks, int ns,
apr_array_header_t *ns_table,
const char *pre_prefix,
ap_text_header *phdr)
{
if (marks[ns])
return;
marks[ns] = 1;
dav_insert_xmlns(propdb->p,
pre_prefix, ns, AP_XML_GET_URI_ITEM(ns_table, ns),
phdr);
}
/*
** Internal function to build a key
**
** WARNING: returns a pointer to a "static" buffer holding the key. The
** value must be copied or no longer used if this function is
** called again.
*/
static dav_datum dav_gdbm_key(dav_propdb *propdb, const ap_xml_elem *elem)
{
int ns;
char nsbuf[20];
size_t l_ns;
size_t l_name = strlen(elem->name);
dav_datum key = { 0 };
/*
* Convert namespace ID to a string. "no namespace" is an empty string,
* so the keys will have the form ":name". Otherwise, the keys will
* have the form "#:name".
*/
if (elem->ns == AP_XML_NS_NONE) {
nsbuf[0] = '\0';
l_ns = 0;
}
else {
if (propdb->ns_map == NULL) {
/*
* Note that we prep the map and do NOT add namespaces. If that
* is required, then the caller should have called prep
* beforehand, passing the correct values.
*/
dav_prep_ns_map(propdb, 0);
}
ns = propdb->ns_map[elem->ns];
if (AP_XML_NS_IS_ERROR(ns))
return key; /* zeroed */
l_ns = sprintf(nsbuf, "%d", ns);
}
/* assemble: #:name */
dav_set_bufsize(propdb->p, &propdb->wb_key, l_ns + 1 + l_name + 1);
memcpy(propdb->wb_key.buf, nsbuf, l_ns);
propdb->wb_key.buf[l_ns] = ':';
memcpy(&propdb->wb_key.buf[l_ns + 1], elem->name, l_name + 1);
/* build the database key */
key.dsize = l_ns + 1 + l_name + 1;
key.dptr = propdb->wb_key.buf;
return key;
}
static dav_error *dav_really_open_db(dav_propdb *propdb, int ro)
{
dav_error *err;
dav_datum key;
dav_datum value = { 0 };
/* 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.
*/
if (propdb->db != NULL) {
key.dptr = DAV_GDBM_NS_KEY;
key.dsize = DAV_GDBM_NS_KEY_LEN;
if ((err = (*propdb->db_hooks->fetch)(propdb->db, key,
&value)) != NULL) {
/* ### push a higher-level description? */
return err;
}
}
if (value.dptr == NULL) {
dav_propdb_metadata m = {
DAV_DBVSN_MAJOR, DAV_DBVSN_MINOR, 0
};
if (propdb->db != NULL) {
/*
* If there is no METADATA key, then the database may be
* from versions 0.9.0 .. 0.9.4 (which would be incompatible).
* These can be identified by the presence of an NS_TABLE entry.
*/
key.dptr = "NS_TABLE";
key.dsize = 8;
if ((*propdb->db_hooks->exists)(propdb->db, key)) {
(*propdb->db_hooks->close)(propdb->db);
/* call it a major version error */
return dav_new_error(propdb->p, HTTP_INTERNAL_SERVER_ERROR,
DAV_ERR_PROP_BAD_MAJOR,
"Prop database has the wrong major "
"version number and cannot be used.");
}
}
/* initialize a new metadata structure */
dav_set_bufsize(propdb->p, &propdb->ns_table, sizeof(m));
memcpy(propdb->ns_table.buf, &m, sizeof(m));
}
else {
dav_propdb_metadata m;
dav_set_bufsize(propdb->p, &propdb->ns_table, value.dsize);
memcpy(propdb->ns_table.buf, value.dptr, value.dsize);
memcpy(&m, value.dptr, sizeof(m));
if (m.major != DAV_DBVSN_MAJOR) {
(*propdb->db_hooks->close)(propdb->db);
return dav_new_error(propdb->p, HTTP_INTERNAL_SERVER_ERROR,
DAV_ERR_PROP_BAD_MAJOR,
"Prop database has the wrong major "
"version number and cannot be used.");
}
propdb->version = m.minor;
propdb->ns_count = ntohs(m.ns_count);
(*propdb->db_hooks->freedatum)(propdb->db, value);
}
return NULL;
}
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->version = DAV_DBVSN_MINOR;
propdb->r = r;
propdb->p = r->pool; /* ### get rid of this */
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;
}
void dav_close_propdb(dav_propdb *propdb)
{
if (propdb->db == NULL)
return;
if (propdb->ns_table_dirty) {
dav_propdb_metadata m;
dav_datum key;
dav_datum value;
dav_error *err;
key.dptr = DAV_GDBM_NS_KEY;
key.dsize = DAV_GDBM_NS_KEY_LEN;
value.dptr = propdb->ns_table.buf;
value.dsize = propdb->ns_table.cur_len;
/* fill in the metadata that we store into the prop db. */
m.major = DAV_DBVSN_MAJOR;
m.minor = propdb->version; /* ### keep current minor version? */
m.ns_count = htons(propdb->ns_count);
memcpy(propdb->ns_table.buf, &m, sizeof(m));
err = (*propdb->db_hooks->store)(propdb->db, key, value);
/* ### what to do with the error? */
}
(*propdb->db_hooks->close)(propdb->db);
}
dav_get_props_result dav_get_allprops(dav_propdb *propdb, dav_prop_insert what)
{
const dav_hooks_db *db_hooks = propdb->db_hooks;
ap_text_header hdr = { 0 };
ap_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*/);
}
/* generate all the namespaces that are in the propdb */
dav_get_propdb_xmlns(propdb, &hdr_ns);
/* initialize the result with some start tags... */
ap_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_datum key;
int dav_id = dav_find_dav_id(propdb);
(void) (*db_hooks->firstkey)(propdb->db, &key);
while (key.dptr) {
dav_datum prevkey;
/* any keys with leading capital letters should be skipped
(real keys start with a number or a colon) */
if (*key.dptr >= 'A' && *key.dptr <= 'Z')
goto next_key;
/*
** 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 (dav_id != -1
&& *key.dptr != ':'
&& dav_id == atoi(key.dptr)) {
const char *colon;
/* find the colon */
if ( key.dptr[1] == ':' ) {
colon = key.dptr + 1;
}
else {
colon = strchr(key.dptr + 2, ':');
}
if (colon[1] == 'g') {
if (strcmp(colon + 1, "getcontenttype") == 0) {
found_contenttype = 1;
}
else if (strcmp(colon + 1, "getcontentlanguage") == 0) {
found_contentlang = 1;
}
}
}
if (what == DAV_PROP_INSERT_VALUE) {
dav_datum value;
(void) (*db_hooks->fetch)(propdb->db, key, &value);
if (value.dptr == NULL) {
/* ### anything better to do? */
/* ### probably should enter a 500 error */
goto next_key;
}
/* put the prop name and value into the result */
dav_append_prop(propdb, key.dptr, value.dptr, &hdr);
(*db_hooks->freedatum)(propdb->db, value);
}
else {
/* simple, empty element if a value isn't needed */
dav_append_prop(propdb, key.dptr, DAV_EMPTY_VALUE, &hdr);
}
next_key:
prevkey = key;
(void) (*db_hooks->nextkey)(propdb->db, &key);
(*db_hooks->freedatum)(propdb->db, prevkey);
}
}
/* 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) {
ap_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_get_props_result dav_get_props(dav_propdb *propdb, ap_xml_doc *doc)
{
const dav_hooks_db *db_hooks = propdb->db_hooks;
ap_xml_elem *elem = dav_find_child(doc->root, "prop");
ap_text_header hdr_good = { 0 };
ap_text_header hdr_bad = { 0 };
ap_text_header hdr_ns = { 0 };
int have_good = 0;
int propdb_xmlns_done = 0;
dav_get_props_result result = { 0 };
char *marks_input;
char *marks_liveprop;
/* ### 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 */
ap_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
input namespaces we've generated into the output xmlns buffer */
marks_input = apr_pcalloc(propdb->p, propdb->ns_xlate->nelts);
/* same for the liveprops */
marks_liveprop = apr_pcalloc(propdb->p, dav_get_liveprop_ns_count() + 1);
for (elem = elem->first_child; elem; elem = elem->next) {
dav_datum key = { 0 };
dav_datum value = { 0 };
dav_elem_private *priv;
dav_error *err;
dav_prop_insert inserted;
int is_liveprop = 0;
/*
** First try live property providers; if they don't handle
** the property, then try looking it up in the propdb.
*/
if (elem->private == NULL) {
elem->private = apr_pcalloc(propdb->p, sizeof(*priv));
}
priv = elem->private;
/* 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) {
is_liveprop = 1;
/* 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) {
int 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);
}
}
continue;
}
else if (inserted == DAV_PROP_INSERT_NOTDEF) {
/* allow property to be handled as a dead property */
is_liveprop = 0;
}
}
/*
** If not handled as a live property, look in the dead property
** database.
*/
if (!is_liveprop) {
/* 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 not done yet,
* generate all the namespaces that are in the propdb
*/
if (!propdb_xmlns_done) {
dav_get_propdb_xmlns(propdb, &hdr_ns);
propdb_xmlns_done = 1;
}
/*
** Note: the key may be NULL if we have no properties that are in
** a namespace that matches the requested prop's namespace.
*/
key = dav_gdbm_key(propdb, elem);
/* fetch IF we have a db and a key. otherwise, value is NULL */
if (propdb->db != NULL && key.dptr != NULL) {
(void) (*db_hooks->fetch)(propdb->db, key, &value);
}
}
if (value.dptr == NULL) {
/* not found. add a record to the "bad" propstats */
/* make sure we've started our "bad" propstat */
if (hdr_bad.first == NULL) {
ap_text_append(propdb->p, &hdr_bad,
"<D:propstat>" DEBUG_CR
"<D:prop>" DEBUG_CR);
}
/* note: key.dptr may be NULL if the propdb doesn't have an
equivalent namespace stored */
if (key.dptr == NULL) {
const char *s;
if (elem->ns == AP_XML_NS_NONE) {
/*
* elem has a prefix already (xml...:name) or the elem
* simply has no namespace.
*/
s = apr_psprintf(propdb->p, "<%s/>" DEBUG_CR, elem->name);
}
else {
/* ensure that an xmlns is generated for the
input namespace */
dav_add_marked_xmlns(propdb, marks_input, elem->ns,
propdb->ns_xlate, "i", &hdr_ns);
s = apr_psprintf(propdb->p, "<i%d:%s/>" DEBUG_CR,
elem->ns, elem->name);
}
ap_text_append(propdb->p, &hdr_bad, s);
}
else {
/* add in the bad prop using our namespace decl */
dav_append_prop(propdb, key.dptr, DAV_EMPTY_VALUE, &hdr_bad);
}
}
else {
/* found it. put the value into the "good" propstats */
have_good = 1;
dav_append_prop(propdb, key.dptr, value.dptr, &hdr_good);
(*db_hooks->freedatum)(propdb->db, value);
}
}
ap_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) {
ap_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;
}
}
result.xmlns = hdr_ns.first;
return result;
}
void dav_get_liveprop_supported(dav_propdb *propdb,
const char *ns_uri,
const char *propname,
ap_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);
}
}
}
void dav_prop_validate(dav_prop_ctx *ctx)
{
dav_propdb *propdb = ctx->propdb;
ap_xml_elem *prop = ctx->prop;
dav_elem_private *priv;
priv = ctx->prop->private = 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.
*/
dav_prep_ns_map(propdb, 1);
}
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).
*/
}
}
void dav_prop_exec(dav_prop_ctx *ctx)
{
dav_propdb *propdb = ctx->propdb;
dav_error *err = NULL;
dav_rollback_item *rollback;
dav_elem_private *priv = ctx->prop->private;
rollback = apr_pcalloc(propdb->p, sizeof(*rollback));
ctx->rollback = rollback;
if (ctx->is_liveprop) {
err = (*priv->provider->patch_exec)(propdb->resource,
ctx->prop, ctx->operation,
ctx->liveprop_ctx,
&ctx->rollback->liveprop);
}
else {
dav_datum key;
/* we're going to need the key for all operations */
key = dav_gdbm_key(propdb, ctx->prop);
/* save the old value so that we can do a rollback. */
rollback->key = key;
if ((err = (*propdb->db_hooks->fetch)(propdb->db, key,
&rollback->value)) != NULL)
goto error;
if (ctx->operation == DAV_PROP_OP_SET) {
dav_datum value;
/* Note: propdb->ns_map was set in dav_prop_validate() */
/* quote all the values in the element */
ap_xml_quote_elem(propdb->p, ctx->prop);
/* generate a text blob for the xml:lang plus the contents */
ap_xml_to_text(propdb->p, ctx->prop, AP_XML_X2T_LANG_INNER, NULL,
propdb->ns_map,
(const char **)&value.dptr, &value.dsize);
err = (*propdb->db_hooks->store)(propdb->db, key, value);
/*
** 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.
*/
}
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, key);
}
}
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);
}
}
void dav_prop_commit(dav_prop_ctx *ctx)
{
dav_elem_private *priv = ctx->prop->private;
/*
** 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);
}
}
void dav_prop_rollback(dav_prop_ctx *ctx)
{
dav_error *err = NULL;
dav_elem_private *priv = ctx->prop->private;
/* 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 if (ctx->rollback->value.dptr == NULL) {
/* don't fail if the thing isn't really there */
/* ### but what about other errors? */
(void) (*ctx->propdb->db_hooks->remove)(ctx->propdb->db,
ctx->rollback->key);
}
else {
err = (*ctx->propdb->db_hooks->store)(ctx->propdb->db,
ctx->rollback->key,
ctx->rollback->value);
}
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;
}
}
}