Open-ILS/src/apachemods/mod_rest_gateway.c

   1 #include "mod_rest_gateway.h"
   2 #include "http_log.h"
   3
   4 char* ils_rest_gateway_config_file;
   5
   6 static const char* ils_gateway_set_config(cmd_parms *parms, void *config, const char *arg) {
   7         ils_gateway_config  *cfg;
   8
   9         cfg = ap_get_module_config(parms->server->module_config, &ils_rest_gateway_module);
  10
  11         cfg->configfile = (char*) arg;
  12         ils_rest_gateway_config_file = (char*) arg;
  13
  14         return NULL;
  15 }
  16
  17 /* tell apache about our commands */
  18 static const command_rec ils_gateway_cmds[] = {
  19         AP_INIT_TAKE1( GATEWAY_CONFIG, ils_gateway_set_config, NULL, RSRC_CONF, "gateway config file"),
  20         {NULL}
  21 };
  22
  23 /* build the config object */
  24 static void* ils_gateway_create_config( apr_pool_t* p, server_rec* s) {
  25         ils_gateway_config* cfg = (ils_gateway_config*) apr_palloc(p, sizeof(ils_gateway_config));
  26         cfg->configfile = GATEWAY_DEFAULT_CONFIG;
  27         return (void*) cfg;
  28 }
  29
  30
  31 static void mod_ils_gateway_child_init(apr_pool_t *p, server_rec *s) {
  32
  33         char* cfg = ils_rest_gateway_config_file;
  34
  35         if( ! osrf_system_bootstrap_client( cfg, CONFIG_CONTEXT) ) {
  36                 osrfLogError( OSRF_LOG_MARK, "Unable to load gateway config file...");
  37                 return;
  38         }
  39         fprintf(stderr, "Bootstrapping %ld\n", (long) getpid() );
  40         fflush(stderr);
  41 }
  42
  43 static int mod_ils_gateway_method_handler (request_rec *r) {
  44
  45         /* make sure we're needed first thing*/
  46         if (strcmp(r->handler, MODULE_NAME ))
  47                 return DECLINED;
  48
  49         osrfLogSetAppname("oils_rest_gw");
  50
  51         apr_pool_t *p = r->pool;        /* memory pool */
  52         char* arg = r->args;                    /* url query string */
  53
  54         char* service                                   = NULL; /* service to connect to */
  55         char* method                                    = NULL; /* method to perform */
  56
  57         //json* exception                               = NULL; /* returned in error conditions */
  58         //jsonObject* exception                         = NULL; /* returned in error conditions */
  59         string_array* sarray                    = init_string_array(12); /* method parameters */
  60
  61         growing_buffer* buffer          = NULL; /* POST data */
  62         growing_buffer* tmp_buf         = NULL; /* temp buffer */
  63
  64         char* key                                               = NULL; /* query item name */
  65         char* val                                               = NULL; /* query item value */
  66
  67         jsonObject* response                    = jsonParseString("{\"status\":0,\"debug\":\"\"}");
  68         jsonObject* payload                     = jsonParseString("[]");
  69         jsonObjectSetKey(response, "payload", payload );
  70
  71         /* verify we are connected */
  72         if(!osrf_system_get_transport_client()) {
  73                 osrfLogError( OSRF_LOG_MARK, "Bootstrap Failed, no transport client");
  74                 return HTTP_INTERNAL_SERVER_ERROR;
  75         }
  76
  77
  78         /* gather the post args and append them to the url query string */
  79         if( !strcmp(r->method,"POST") ) {
  80
  81                 ap_setup_client_block(r,REQUEST_CHUNKED_DECHUNK);
  82
  83                 if(! ap_should_client_block(r)) {
  84                         osrfLogWarning( OSRF_LOG_MARK, "No Post Body");
  85                 }
  86
  87                 char body[1025];
  88                 memset(body,0,1025);
  89                 buffer = buffer_init(1025);
  90
  91                 while(ap_get_client_block(r, body, 1024)) {
  92                         buffer_add( buffer, body );
  93                         memset(body,0,1025);
  94                 }
  95
  96                 if(arg && arg[0]) {
  97                         tmp_buf = buffer_init(1024);
  98                         buffer_add(tmp_buf,arg);
  99                         buffer_add(tmp_buf,buffer->buf);
 100                         arg = (char*) apr_pstrdup(p, tmp_buf->buf);
 101                         buffer_free(tmp_buf);
 102                 } else {
 103                         arg = (char*) apr_pstrdup(p, buffer->buf);
 104                 }
 105                 buffer_free(buffer);
 106
 107         }
 108
 109         ap_log_rerror( APLOG_MARK, APLOG_DEBUG, 0, r, "URL: %s", arg );
 110
 111
 112         if( ! arg || !arg[0] ) { /* we received no request */
 113                 osrfLogWarning( OSRF_LOG_MARK, "No Args");
 114                 return OK;
 115         }
 116
 117         r->allowed |= (AP_METHOD_BIT << M_GET);
 118         r->allowed |= (AP_METHOD_BIT << M_POST);
 119
 120
 121         while( arg && (val = ap_getword(p, (const char**) &arg, '&'))) {
 122
 123                 key = ap_getword(r->pool, (const char**) &val, '=');
 124                 if(!key || !key[0])
 125                         break;
 126
 127                 ap_unescape_url((char*)key);
 128                 ap_unescape_url((char*)val);
 129
 130                 if(!strcmp(key,"service"))
 131                         service = val;
 132
 133                 if(!strcmp(key,"method"))
 134                         method = val;
 135
 136                 if(!strcmp(key,"param"))
 137                         string_array_add(sarray, val);
 138
 139         }
 140
 141         osrfLogInfo( OSRF_LOG_MARK, "Performing(%ld):  service %s | method %s | \n",
 142                         (long) getpid(), service, method );
 143
 144         int k;
 145         for( k = 0; k!= sarray->size; k++ ) {
 146                 osrfLogInfo( OSRF_LOG_MARK,  "param %s", string_array_get_string(sarray,k));
 147         }
 148
 149         osrf_app_session* session = osrf_app_client_session_init(service);
 150
 151         osrfLogDebug( OSRF_LOG_MARK, "MOD session service: %s", session->remote_service );
 152
 153         int req_id = osrf_app_session_make_req( session, NULL, method, 1, sarray );
 154         string_array_destroy(sarray);
 155
 156         osrf_message* omsg = NULL;
 157
 158         while((omsg = osrf_app_session_request_recv( session, req_id, 60 ))) {
 159
 160                 jsonObjectSetKey(response, "status", jsonNewNumberObject(omsg->status_code));
 161
 162                 if( omsg->_result_content ) {
 163                         jsonObjectPush( payload, jsonObjectClone(omsg->_result_content));
 164
 165                 } else {
 166
 167                         char* s = omsg->status_name ? omsg->status_name : "Unknown Error";
 168                         char* t = omsg->status_text ? omsg->status_text : "No Error Message";
 169                         jsonObjectSetKey(response, "debug", jsonNewObject("\n\n%s:\n%s\n", s, t));
 170                         osrfLogError( OSRF_LOG_MARK,  "Gateway received error: %s",
 171                                         jsonObjectGetString(jsonObjectGetKey(response, "debug")));
 172                         break;
 173                 }
 174
 175                 osrf_message_free(omsg);
 176                 omsg = NULL;
 177         }
 178
 179         char* content = jsonObjectToJSON(response);
 180         char* xml = json_string_to_xml( content );
 181
 182         free(content);
 183         jsonObjectFree(response);
 184
 185
 186         /* set content type to text/xml for passing around XML objects */
 187         ap_set_content_type(r, "text/xml");
 188         ap_rputs(xml,r);
 189         free(xml);
 190
 191         osrf_app_session_request_finish( session, req_id );
 192         osrfLogDebug( OSRF_LOG_MARK, "gateway process message successfully");
 193
 194
 195         osrf_app_session_destroy(session);
 196
 197
 198         return OK;
 199
 200 }
 201
 202 static void mod_ils_gateway_register_hooks (apr_pool_t *p) {
 203         ap_hook_handler(mod_ils_gateway_method_handler, NULL, NULL, APR_HOOK_MIDDLE);
 204         ap_hook_child_init(mod_ils_gateway_child_init,NULL,NULL,APR_HOOK_MIDDLE);
 205 }
 206
 207
 208 module AP_MODULE_DECLARE_DATA ils_rest_gateway_module = {
 209         STANDARD20_MODULE_STUFF,
 210         NULL,
 211         NULL,
 212         ils_gateway_create_config,
 213         NULL,
 214         ils_gateway_cmds,
 215         mod_ils_gateway_register_hooks,
 216 };
 217