Open-ILS/src/apachemods/mod_rest_gateway.c

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