subversion/libsvn_ra_neon/get_dated_rev.c

   1 /*
   2  * date_rev.c :  RA get-dated-revision API implementation
   3  *
   4  * ====================================================================
   5  * Copyright (c) 2000-2007 CollabNet.  All rights reserved.
   6  *
   7  * This software is licensed as described in the file COPYING, which
   8  * you should have received as part of this distribution.  The terms
   9  * are also available at http://subversion.tigris.org/license-1.html.
  10  * If newer versions of this license are posted there, you may use a
  11  * newer version instead, at your option.
  12  *
  13  * This software consists of voluntary contributions made by many
  14  * individuals.  For exact contribution history, see the revision
  15  * history and logs, available at http://subversion.tigris.org/.
  16  * ====================================================================
  17  */
  18
  19
  20 \f
  21 #define APR_WANT_STRFUNC
  22 #include <apr_want.h> /* for strcmp() */
  23
  24 #include <apr_pools.h>
  25 #include <apr_tables.h>
  26 #include <apr_strings.h>
  27 #include <apr_md5.h>
  28 #include <apr_xml.h>
  29
  30 #include <ne_basic.h>
  31
  32 #include "svn_error.h"
  33 #include "svn_pools.h"
  34 #include "svn_ra.h"
  35 #include "../libsvn_ra/ra_loader.h"
  36 #include "svn_path.h"
  37 #include "svn_xml.h"
  38 #include "svn_dav.h"
  39 #include "svn_time.h"
  40
  41 #include "private/svn_dav_protocol.h"
  42 #include "svn_private_config.h"
  43
  44 #include "ra_neon.h"
  45
  46
  47 /* -------------------------------------------------------------------------
  48 **
  49 ** DATED REV REPORT HANDLING
  50 **
  51 ** DeltaV provides no mechanism for mapping a date to a revision, so
  52 ** we use a custom report, S:dated-rev-report.  The request contains a
  53 ** DAV:creationdate element giving the requested date; the response
  54 ** contains a DAV:version-name element giving the most recent revision
  55 ** as of that date.
  56 **
  57 ** Since this report is so simple, we don't bother with validation or
  58 ** baton structures or anything; we just set the revision number in
  59 ** the end-element handler for DAV:version-name.
  60 */
  61
  62 /* Elements used in a dated-rev-report response */
  63 static const svn_ra_neon__xml_elm_t drev_report_elements[] =
  64 {
  65   { SVN_XML_NAMESPACE, "dated-rev-report", ELEM_dated_rev_report, 0 },
  66   { "DAV:", "version-name", ELEM_version_name, SVN_RA_NEON__XML_CDATA },
  67   { NULL }
  68 };
  69
  70 typedef struct
  71 {
  72   svn_stringbuf_t *cdata;
  73   apr_pool_t *pool;
  74   svn_revnum_t revision;
  75 } drev_baton_t;
  76
  77
  78 /* This implements the `svn_ra_neon__xml_startelm_cb' prototype. */
  79 static svn_error_t *
  80 drev_start_element(int *elem, void *baton, int parent,
  81                    const char *nspace, const char *name, const char **atts)
  82 {
  83   const svn_ra_neon__xml_elm_t *elm =
  84     svn_ra_neon__lookup_xml_elem(drev_report_elements, nspace, name);
  85   drev_baton_t *b = baton;
  86
  87   *elem = elm ? elm->id : SVN_RA_NEON__XML_DECLINE;
  88   if (!elm)
  89     return SVN_NO_ERROR;
  90
  91   if (elm->id == ELEM_version_name)
  92     b->cdata = svn_stringbuf_create("", b->pool);
  93
  94   return SVN_NO_ERROR;
  95 }
  96
  97 /* This implements the `svn_ra_neon__xml_endelm_cb' prototype. */
  98 static svn_error_t *
  99 drev_end_element(void *baton, int state,
 100                  const char *nspace, const char *name)
 101 {
 102   drev_baton_t *b = baton;
 103
 104   if (state == ELEM_version_name && b->cdata)
 105     {
 106       b->revision = SVN_STR_TO_REV(b->cdata->data);
 107       b->cdata = NULL;
 108     }
 109
 110   return SVN_NO_ERROR;
 111 }
 112
 113 svn_error_t *svn_ra_neon__get_dated_revision(svn_ra_session_t *session,
 114                                              svn_revnum_t *revision,
 115                                              apr_time_t timestamp,
 116                                              apr_pool_t *pool)
 117 {
 118   svn_ra_neon__session_t *ras = session->priv;
 119   const char *body;
 120   const char *vcc_url;
 121   svn_error_t *err;
 122   drev_baton_t *b = apr_palloc(pool, sizeof(*b));
 123
 124   b->pool = pool;
 125   b->cdata = NULL;
 126   b->revision = SVN_INVALID_REVNUM;
 127
 128   /* Run the 'dated-rev-report' on the VCC url, which is always
 129      guaranteed to exist.   */
 130   SVN_ERR(svn_ra_neon__get_vcc(&vcc_url, ras, ras->root.path, pool));
 131
 132   body = apr_psprintf(pool,
 133                       "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
 134                       "<S:dated-rev-report xmlns:S=\"" SVN_XML_NAMESPACE "\" "
 135                       "xmlns:D=\"DAV:\">"
 136                       "<D:" SVN_DAV__CREATIONDATE ">%s</D:"
 137                       SVN_DAV__CREATIONDATE "></S:dated-rev-report>",
 138                       svn_time_to_cstring(timestamp, pool));
 139
 140   err = svn_ra_neon__parsed_request(ras, "REPORT",
 141                                     vcc_url, body, NULL, NULL,
 142                                     drev_start_element,
 143                                     svn_ra_neon__xml_collect_cdata,
 144                                     drev_end_element,
 145                                     b, NULL, NULL, FALSE, pool);
 146   if (err && err->apr_err == SVN_ERR_UNSUPPORTED_FEATURE)
 147     return svn_error_quick_wrap(err, _("Server does not support date-based "
 148                                        "operations"));
 149   else if (err)
 150     return err;
 151
 152   if (b->revision == SVN_INVALID_REVNUM)
 153     return svn_error_create(SVN_ERR_INCOMPLETE_DATA, NULL,
 154                             _("Invalid server response to dated-rev request"));
 155
 156   *revision = b->revision;
 157   return SVN_NO_ERROR;
 158 }