src/server/plugins/postgresql/config.c

Sun, 06 Nov 2022 15:53:32 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Sun, 06 Nov 2022 15:53:32 +0100
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parent 376
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child 418
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permissions
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switch from ucx 2 to 3

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2022 Olaf Wintermann. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include "config.h"
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30
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31 #include "../../util/util.h"
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32
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33 #include <libxml/tree.h>
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34
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35 #define xstreq(a,b) xmlStrEqual(BAD_CAST a, BAD_CAST b)
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36
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37 static int pg_load_ext_dav_config(
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38 ServerConfiguration *cfg,
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39 pool_handle_t *pool,
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40 PgRepository *repo,
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41 const char *file);
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42
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43
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44 static const char *sql_get_repository_root = "select resource_id from Resource where parent_id is NULL and nodename = $1 ;";
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45
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46
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47 // Uses a PGconn to lookup the resource id of the specified root node
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48 // if the lookup succeeds, the resource id is written to rootid
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49 // in case of an error, an error message will be logged
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50 // returns: 0 success, 1 error
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51 int pg_lookup_root(ResourceData *res, const char *rootnode, int64_t *rootid) {
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52 PGconn *connection = res->data;
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53
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54 PGresult *result = PQexecParams(
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55 connection,
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56 sql_get_repository_root,
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57 1, // number of parameters
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58 NULL,
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59 &rootnode, // parameter value
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60 NULL,
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61 NULL,
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62 0); // 0: result in text format
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63
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64 if(!result) {
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65 log_ereport(LOG_FAILURE, "pg: root lookup failed: %s", PQerrorMessage(connection));
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66 return 1;
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67 }
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68
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69 int ret = 0;
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70
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71 int nrows = PQntuples(result);
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72 if(nrows == 1) {
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73 char *resource_id_str = PQgetvalue(result, 0, 0);
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74 if(resource_id_str) {
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75 if(!util_strtoint(resource_id_str, rootid)) {
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76 log_ereport(LOG_FAILURE, "pg: unexpected result for column resource_id", rootnode);
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77 ret = 1;
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78 }
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79 }
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80 } else {
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81 log_ereport(LOG_FAILURE, "pg: cannot find root resource '%s'", rootnode);
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82 ret = 1;
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83 }
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84 PQclear(result);
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85
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86 return ret;
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87 }
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88
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89 PgRepository* pg_init_repo(ServerConfiguration *cfg, pool_handle_t *pool, WSConfigNode *config) {
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90 CxAllocator *a = pool_allocator(pool);
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91
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92 ConfigNode *pg = serverconfig_get_node(config, CONFIG_NODE_OBJECT, cx_str("Postgresql"));
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93 if(!pg) {
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94 log_ereport(LOG_MISCONFIG, "pg_init_repo: missing postgresql config object");
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95 return NULL;
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96 }
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97
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98 cxstring cfg_respool = serverconfig_directive_value(pg, cx_str("ResourcePool"));
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99 cxstring cfg_rootid = serverconfig_directive_value(pg, cx_str("RootId"));
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100 cxstring cfg_rootnode = serverconfig_directive_value(pg, cx_str("RootNode"));
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101 cxstring cfg_dav = serverconfig_directive_value(pg, cx_str("PGDavConfig"));
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102
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103 // minimum requirement is a resource pool
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104 if(cfg_respool.length == 0) {
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105 return NULL;
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106 }
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107
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108 // check rootid
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109 int64_t root_id = 1;
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110 if(cfg_rootid.length > 0) {
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111 if(!util_strtoint(cfg_rootid.ptr, &root_id)) {
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112 log_ereport(LOG_MISCONFIG, "pg_init_repo: RootId parameter is not an integer: %s", cfg_rootid.ptr);
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113 return NULL;
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114 }
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115 }
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116
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117 // warn if RootId and RootNode are specified
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118 if(cfg_rootid.length > 0 && cfg_rootnode.length > 0) {
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119 log_ereport(LOG_WARN, "log_init_repo: RootId and RootNode specified, RootNode ignored");
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120 } else if(cfg_rootnode.length > 0) {
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121 // check root node
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122
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123 // resolve rootnode
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124 // therefore we first need to get a connection from the resourcepool
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125 ResourceData *res = resourcepool_cfg_lookup(cfg, cfg_respool.ptr, 0);
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126 if(!res) {
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127 log_ereport(LOG_MISCONFIG, "pg_init_repo: resource lookup failed");
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128 return NULL;
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129 }
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130 // do lookup, if successful, root_id will be set
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131 int lookup_err = pg_lookup_root(res, cfg_rootnode.ptr, &root_id);
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132 // we don't need the connection anymore
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133 resourcepool_free(NULL, NULL, res);
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134 if(lookup_err) {
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135 // no logging required, pg_lookup_root will log the error
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136 return NULL;
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137 }
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138 }
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139
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140 PgRepository *repo = pool_malloc(pool, sizeof(PgRepository));
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141 ZERO(repo, sizeof(PgRepository));
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142
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143 repo->resourcepool = cx_strdup_a(a, cfg_respool);
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144 repo->root_resource_id = root_id;
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145
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146 // check for extended pg dav config
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147 if(cfg_dav.length > 0) {
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148 // load extended config from config file
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149 char *cfg_file_path = cfg_config_file_path(cfg_dav.ptr);
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150 if(pg_load_ext_dav_config(cfg, pool, repo, cfg_file_path)) {
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151 // error
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152 repo = NULL; // no need to cleanup because everything is from the pool
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153 }
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154 free(cfg_file_path);
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155 }
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156
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157 return repo;
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158 }
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159
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160 static int pg_ext_get_config(
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161 ServerConfiguration *cfg,
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162 pool_handle_t *pool,
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163 PgRepository *repo,
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164 const char *file_path,
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165 xmlNode *root);
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166 static int pg_ext_get_extension(
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167 PgExtParser *ext,
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168 pool_handle_t *pool,
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169 PgRepository *repo,
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170 const char *file_path,
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171 xmlNode *ext_node);
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172
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173 static const char* pg_util_xml_get_text(const xmlNode *elm) {
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174 xmlNode *node = elm->children;
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175 while(node) {
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176 if(node->type == XML_TEXT_NODE) {
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177 return (const char*)node->content;
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178 }
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179 node = node->next;
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180 }
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181 return NULL;
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182 }
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183
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184 // load additional postgresql webdav config from the specified xml file
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185 static int pg_load_ext_dav_config(
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186 ServerConfiguration *cfg,
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187 pool_handle_t *pool,
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188 PgRepository *repo,
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189 const char *file_path)
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190 {
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191 CxAllocator *a = pool_allocator(pool);
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192
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193 // check if the file exists and can be accessed
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194 struct stat s;
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195 if(stat(file_path, &s)) {
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196 if(errno == ENOENT) {
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197 log_ereport(LOG_FAILURE, "pg: config file %s not found", file_path);
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198 } else {
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199 log_ereport(LOG_FAILURE, "pg: cannot access config file %s", file_path);
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200 }
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201
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202 return 1;
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203 }
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204
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205 // prepare PgRepository
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206 repo->prop_ext = cxHashMapCreate(a, 8);
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207 if(!repo->prop_ext) {
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208 log_ereport(LOG_FAILURE, "pg: cannot load config file: OOM");
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209 return 1;
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210 }
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211
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212 // load xml document
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213 xmlDoc *doc = xmlReadFile(file_path, NULL, 0);
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214 if(!doc) {
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215 log_ereport(LOG_FAILURE, "pg: cannot load config file %s", file_path);
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216 return 1;
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217 }
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218
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219 // the root element must be <repository>
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220 int ret = 0;
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221 xmlNode *xml_root = xmlDocGetRootElement(doc);
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222 if(xstreq(xml_root->name, "repository")) {
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223 // parse config
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224 ret = pg_ext_get_config(cfg, pool, repo, file_path, xml_root);
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225 } else {
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226 log_ereport(LOG_MISCONFIG, "pg: config %s: root element <repository> expected", file_path);
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227 ret = 1;
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228 }
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229 xmlFreeDoc(doc);
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230
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231 return ret;
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232 }
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233
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234
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235
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236
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237 static int pg_ext_get_config(
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238 ServerConfiguration *cfg,
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239 pool_handle_t *pool,
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240 PgRepository *repo,
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241 const char *file_path,
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242 xmlNode *root)
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243 {
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244 xmlNode *node = root->children;
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245 int ret = 0;
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246
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247 PgExtParser parserData;
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248 parserData.table_lookup = cxHashMapCreate(cxDefaultAllocator, 8);
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249 parserData.tables = cxLinkedListCreate(cxDefaultAllocator, cx_cmp_ptr, sizeof(PgExtTable));
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250
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251 while(node && !ret) {
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252 // currently, the only possible config element is <extension>
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253 if(node->type == XML_ELEMENT_NODE) {
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254 if(xstreq(node->name, "extension")) {
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255 ret = pg_ext_get_extension(&parserData, pool, repo, file_path, node);
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256 }
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257 }
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258 node = node->next;
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259 }
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260
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261 // convert parserData
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262 if(!ret) {
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263 size_t ntables = parserData.tables->size;
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264 repo->ntables = ntables;
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265 repo->tables = pool_calloc(pool, ntables, sizeof(PgExtTable));
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266 if(repo->tables) {
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267 int i = 0;
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268 CxIterator iter = cxListIterator(parserData.tables, 0);
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269 cx_foreach(PgExtTable *, tab, iter) {
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270 repo->tables[i++] = *tab;
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271 }
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272 } else {
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273 ret = 1;
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274 }
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275
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276 }
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277
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278 // cleanup parser
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279 cxListDestroy(parserData.tables);
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280 cxMapDestroy(parserData.table_lookup);
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281
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282 return ret;
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283 }
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284
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285 static int pg_ext_get_extension(
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286 PgExtParser *ext,
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287 pool_handle_t *pool,
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288 PgRepository *repo,
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289 const char *file_path,
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290 xmlNode *ext_node)
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291 {
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292 CxAllocator *a = pool_allocator(pool);
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293
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294 xmlNode *node = ext_node->children;
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295
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296 const char *table = NULL;
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297 CxList *properties = cxPointerLinkedListCreate(a, cx_cmp_ptr);
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298
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299 while(node) {
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300 if(node->type == XML_ELEMENT_NODE) {
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301 if(xstreq(node->name, "table")) {
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302 const char *value = pg_util_xml_get_text(node);
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303 if(!value) {
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304 log_ereport(LOG_MISCONFIG, "pg: config %s: table: missing value", file_path, table);
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305 return 1;
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306 } else if(table) {
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307 log_ereport(LOG_MISCONFIG, "pg: config %s: table %s already set", file_path, table);
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308 return 1;
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309 }
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310 table = value;
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311 } else if(xstreq(node->name, "properties")) {
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312 // add all child elements to the properties list
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313 xmlNode *ps = node->children;
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314 while(ps) {
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315 if(ps->type == XML_ELEMENT_NODE) {
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316 // validate
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317 // required: namespace, value
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318 if(!ps->ns || !ps->ns->href) {
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319 log_ereport(LOG_MISCONFIG, "pg: config %s: property %s: missing namespace", file_path, ps->name);
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320 return 1;
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321 }
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322 const char *value = pg_util_xml_get_text(ps);
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323 if(!value) {
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324 log_ereport(LOG_MISCONFIG, "pg: config %s: no column specified for property %s", file_path, ps->name);
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325 return 1;
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326 }
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327 cxListAdd(properties, ps);
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328 }
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329 ps = ps->next;
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330 }
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331 }
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332 }
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333 node = node->next;
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334 }
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335
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336 // check if anything is missing
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337 if(!table) {
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338 log_ereport(LOG_MISCONFIG, "pg: config %s: missing table value for extension", file_path);
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339 return 1;
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340 }
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341 if(!properties) {
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342 log_ereport(LOG_MISCONFIG, "pg: config %s: no properties configured for extension", file_path);
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343 return 1;
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344 }
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345
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346 // check if the table was already specified
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347 if(cxMapGet(ext->table_lookup, cx_hash_key_str(table))) {
373
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348 log_ereport(LOG_MISCONFIG, "pg: config %s: extension table %s not unique", file_path, table);
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349 return 1;
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350 }
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351 // mark table as used
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352 // tabname will be used later, so ist must be allocated in the pool
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353 char *tabname = pool_strdup(pool, table);
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354 if(!tabname) return 1;
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355
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356 // exttable is only used temporarily
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357 PgExtTable exttable;
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358 exttable.table = tabname;
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359 exttable.isused = 0; // not relevant in config
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360 int tableindex = (int)ext->tables->size;
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361 cxListAdd(ext->tables, &exttable);
373
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362
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363 if(cxMapPut(ext->table_lookup, cx_hash_key_str(table), (void*)table)) {
373
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364 return 1;
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365 }
376
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366
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367 CxIterator iter = cxListIterator(properties, 0);
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368 cx_foreach(xmlNode *, ps, iter) {
373
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369 const char *value = pg_util_xml_get_text(ps);
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370
376
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371 PgPropertyStoreExt *ext_col = pool_malloc(pool, sizeof(PgPropertyStoreExt));
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372 if(!ext_col) {
373
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373 return 1;
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374 }
376
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375 ext_col->tableindex = tableindex;
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376 ext_col->ns = pool_strdup(pool, (const char*)ps->ns->href);
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377 ext_col->name = pool_strdup(pool, (const char*)ps->name);
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378 ext_col->column = pool_strdup(pool, (const char*)value);
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379 if(!ext_col->ns || !ext_col->name || !ext_col->column) {
373
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380 return 1;
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381 }
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382
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383 CxHashKey key = webdav_property_key(ext_col->ns, ext_col->name);
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384 int err = cxMapPut(repo->prop_ext, key, ext_col);
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385 free(key.data.bytes);
373
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386 if(err) {
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387 return 1;
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388 }
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389 }
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390
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391 return 0;
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392 }

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