2 * Copyright (C) 2015 "IoT.bzh"
3 * Author "Fulup Ar Foll"
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 * Contain all generic part to handle REST/API
21 #include "../include/local-def.h"
26 #define AFB_MSG_JTYPE "AJB_reply"
29 // handle to hold queryAll values
36 static json_object *afbJsonType;
39 // Sample Generic Ping Debug API
40 PUBLIC json_object* apiPingTest(AFB_request *request) {
42 json_object *response;
47 AFB_clientCtx *client=request->client; // get client context from request
49 // request all query key/value
50 len = getQueryAll (request, query, sizeof(query));
51 if (len == 0) strncpy (query, "NoSearchQueryList", sizeof(query));
53 // check if we have some post data
54 if (request->post == NULL) request->post="NoData";
56 // check is we have a session and a plugin handle
57 if (client == NULL) strcpy (session,"NoSession");
58 else snprintf(session, sizeof(session),"uuid=%s token=%s ctx=0x%x handle=0x%x", client->uuid, client->token, client->ctx, client->ctx);
60 // return response to caller
61 response = jsonNewMessage(AFB_SUCCESS, "Ping Binder Daemon count=%d CtxtId=%d query={%s} session={%s} PostData: [%s] "
62 , pingcount++, request->client->cid, query, session, request->post);
66 // Helper to retrieve argument from connection
67 PUBLIC const char* getQueryValue(AFB_request * request, char *name) {
70 value = MHD_lookup_connection_value(request->connection, MHD_GET_ARGUMENT_KIND, name);
74 STATIC int getQueryCB (void*handle, enum MHD_ValueKind kind, const char *key, const char *value) {
75 queryHandleT *query = (queryHandleT*)handle;
77 query->idx += snprintf (&query->msg[query->idx],query->len," %s: \'%s\',", key, value);
80 // Helper to retrieve argument from connection
81 PUBLIC int getQueryAll(AFB_request * request, char *buffer, size_t len) {
83 buffer[0] = '\0'; // start with an empty string
88 MHD_get_connection_values (request->connection, MHD_GET_ARGUMENT_KIND, getQueryCB, &query);
92 // Because of POST call multiple time requestApi we need to free POST handle here
93 STATIC void endRequest(void *cls, struct MHD_Connection *connection, void **con_cls, enum MHD_RequestTerminationCode toe) {
94 AFB_HttpPost *posthandle = *con_cls;
96 // if post handle was used let's free everything
98 if (verbose) fprintf(stderr, "End Post Request UID=%d\n", posthandle->uid);
99 free(posthandle->data);
104 // Check of apiurl is declare in this plugin and call it
105 STATIC AFB_error callPluginApi(AFB_plugin *plugin, AFB_request *request) {
106 json_object *jresp, *jcall;
107 int idx, status, sig;
108 int signals[]= {SIGALRM, SIGSEGV, SIGFPE, 0};
110 /*---------------------------------------------------------------
111 | Signal handler defined inside CallPluginApi to access Request
112 +---------------------------------------------------------------- */
113 void pluginError (int signum) {
115 AFB_clientCtx *context;
117 // unlock signal to allow a new signal to come
118 sigemptyset (&sigset);
119 sigaddset (&sigset, signum);
120 sigprocmask (SIG_UNBLOCK, &sigset, 0);
122 fprintf (stderr, "Oops:%s Plugin Api Timeout timeout\n", configTime());
123 longjmp (request->checkPluginCall, signum);
127 // If a plugin hold this urlpath call its callback
128 for (idx = 0; plugin->apis[idx].callback != NULL; idx++) {
129 if (!strcmp(plugin->apis[idx].name, request->api)) {
131 // prepare an object to store calling values
132 jcall=json_object_new_object();
133 json_object_object_add(jcall, "prefix", json_object_new_string (plugin->prefix));
134 json_object_object_add(jcall, "api" , json_object_new_string (plugin->apis[idx].name));
136 // save context before calling the API
137 status = setjmp (request->checkPluginCall);
140 // Plugin aborted somewhere during its execution
141 json_object_object_add(jcall, "status", json_object_new_string ("abort"));
142 json_object_object_add(jcall, "info" , json_object_new_string ("Plugin broke during execution"));
143 json_object_object_add(request->jresp, "request", jcall);
147 // If timeout protection==0 we are in debug and we do not apply signal protection
148 if (request->config->apiTimeout > 0) {
149 for (sig=0; signals[sig] != 0; sig++) {
150 if (signal (signals[sig], pluginError) == SIG_ERR) {
151 request->errcode = MHD_HTTP_UNPROCESSABLE_ENTITY;
152 request->jresp = jsonNewMessage(AFB_FATAL, "%s ERR: Signal/timeout handler activation fail.", configTime());
156 // Trigger a timer to protect from unacceptable long time execution
157 alarm (request->config->apiTimeout);
160 // add client context to request
161 ctxClientGet(request, plugin);
163 // Effectively call the API with a subset of the context
164 jresp = plugin->apis[idx].callback(request, plugin->handle);
166 // API should return NULL of a valid Json Object
168 json_object_object_add(jcall, "status", json_object_new_string ("null"));
169 json_object_object_add(request->jresp, "request", jcall);
170 request->errcode = MHD_HTTP_NO_RESPONSE;
173 json_object_object_add(jcall, "status", json_object_new_string ("processed"));
174 json_object_object_add(request->jresp, "request", jcall);
175 json_object_object_add(request->jresp, "response", jresp);
177 // cancel timeout and plugin signal handle before next call
178 if (request->config->apiTimeout > 0) {
180 for (sig=0; signals[sig] != 0; sig++) {
181 signal (signals[sig], SIG_DFL);
191 STATIC AFB_error findAndCallApi (struct MHD_Connection *connection, AFB_session *session, const char* url, AFB_request *request) {
193 char *baseurl, *baseapi;
196 // build request structure
197 memset(request, 0, sizeof (request));
198 request->connection = connection;
199 request->config = session->config;
201 request->plugin = baseurl;
202 request->api = baseapi;
203 request->jresp = json_object_new_object();
205 // increase reference count and add jtype to response
206 json_object_get (afbJsonType);
207 json_object_object_add (request->jresp, "jtype", afbJsonType);
209 // Search for a plugin with this urlpath
210 for (idx = 0; session->plugins[idx] != NULL; idx++) {
211 if (!strcmp(session->plugins[idx]->prefix, baseurl)) {
212 status =callPluginApi(session->plugins[idx], request);
216 // No plugin was found
217 if (session->plugins[idx] == NULL) {
218 request->jresp = jsonNewMessage(AFB_FATAL, "No Plugin=[%s]", request->plugin);
219 request->errcode = MHD_HTTP_UNPROCESSABLE_ENTITY;
223 // plugin callback did not return a valid Json Object
224 if (status != AFB_DONE) {
225 request->jresp = jsonNewMessage(AFB_FATAL, "No API=[%s] for Plugin=[%s]", request->api, request->plugin);
226 request->errcode = MHD_HTTP_UNPROCESSABLE_ENTITY;
233 // process rest API query
234 PUBLIC int doRestApi(struct MHD_Connection *connection, AFB_session *session, const char* url, const char *method
235 , const char *upload_data, size_t *upload_data_size, void **con_cls) {
237 static int postcount = 0; // static counter to debug POST protocol
238 char *baseurl, *baseapi, *urlcpy1, *urlcpy2, *query, *token, *uuid;
239 json_object *errMessage;
241 struct MHD_Response *webResponse;
242 const char *serialized, parsedurl;
244 AFB_HttpPost *posthandle = *con_cls;
245 AFB_clientCtx clientCtx;
248 // Extract plugin urlpath from request and make two copy because strsep overload copy
249 urlcpy1 = urlcpy2 = strdup(url);
250 baseurl = strsep(&urlcpy2, "/");
251 if (baseurl == NULL) {
252 errMessage = jsonNewMessage(AFB_FATAL, "Invalid API call url=[%s]", url);
256 baseapi = strsep(&urlcpy2, "/");
257 if (baseapi == NULL) {
258 errMessage = jsonNewMessage(AFB_FATAL, "Invalid API call url=[%s]", url);
263 // if post data may come in multiple calls
264 if (0 == strcmp(method, MHD_HTTP_METHOD_POST)) {
265 const char *encoding, *param;
267 AFB_HttpPost *posthandle = *con_cls;
269 // Let make sure we have the right encoding and a valid length
270 encoding = MHD_lookup_connection_value(connection, MHD_HEADER_KIND, MHD_HTTP_HEADER_CONTENT_TYPE);
271 param = MHD_lookup_connection_value(connection, MHD_HEADER_KIND, MHD_HTTP_HEADER_CONTENT_LENGTH);
272 if (param) sscanf(param, "%i", &contentlen);
274 // POST datas may come in multiple chunk. Even when it never happen on AFB, we still have to handle the case
276 // This is FORM post only file upload is supported
277 if (strcasestr(encoding, FORM_CONTENT) != NULL) {
278 request.post= (void*)upload_data;
279 request.len = *upload_data_size;
280 status = findAndCallApi (connection, session, url, &request);
284 // POST datas may come in multiple chunk. Even when it never happen on AFB, we still have to handle the case
285 if (strcasestr(encoding, JSON_CONTENT) == NULL) {
286 errMessage = jsonNewMessage(AFB_FATAL, "Post Date wrong type encoding=%s != %s", encoding, JSON_CONTENT);
289 if (contentlen > MAX_POST_SIZE) {
290 errMessage = jsonNewMessage(AFB_FATAL, "Post Date to big %d > %d", contentlen, MAX_POST_SIZE);
294 // In POST mode first libmicrohttp call only establishes POST handling.
295 if (posthandle == NULL) {
296 posthandle = malloc(sizeof (AFB_HttpPost)); // allocate application POST processor handle
297 posthandle->uid = postcount++; // build a UID for DEBUG
298 posthandle->len = 0; // effective length within POST handler
299 posthandle->data = malloc(contentlen + 1); // allocate memory for full POST data + 1 for '\0' enf of string
300 *con_cls = posthandle; // attache POST handle to current HTTP session
302 if (verbose) fprintf(stderr, "Create Post[%d] Size=%d\n", posthandle->uid, contentlen);
306 // This time we receive partial/all Post data. Note that even if we get all POST data. We should nevertheless
307 // return MHD_YES and not process the request directly. Otherwise Libmicrohttpd is unhappy and fails with
308 // 'Internal application error, closing connection'.
309 if (*upload_data_size) {
310 if (verbose) fprintf(stderr, "Update Post[%d]\n", posthandle->uid);
312 memcpy(&posthandle->data[posthandle->len], upload_data, *upload_data_size);
313 posthandle->len = posthandle->len + *upload_data_size;
314 *upload_data_size = 0;
318 // We should only start to process DATA after Libmicrohttpd call or application handler with *upload_data_size==0
319 // At this level we're may verify that we got everything and process DATA
320 if (posthandle->len != contentlen) {
321 errMessage = jsonNewMessage(AFB_FATAL, "Post Data Incomplete UID=%d Len %d != %s", posthandle->uid, contentlen, posthandle->len);
325 // Before processing data, make sure buffer string is properly ended
326 posthandle->data[posthandle->len] = '\0';
327 request.post = posthandle->data;
329 if (verbose) fprintf(stderr, "Close Post[%d] Buffer=%s\n", posthandle->uid, request.post);
335 // Now that we got request data let's call the API
336 status = findAndCallApi (connection, session, url, &request);
338 serialized = json_object_to_json_string(request.jresp);
339 webResponse = MHD_create_response_from_buffer(strlen(serialized), (void*) serialized, MHD_RESPMEM_MUST_COPY);
342 // client did not pass token on URI let's use cookies
343 if ((!request.restfull) && (request.client != NULL)) {
345 snprintf (cookie, sizeof (cookie), "%s=%s", COOKIE_NAME, request.client->uuid);
346 MHD_add_response_header (webResponse, MHD_HTTP_HEADER_SET_COOKIE, cookie);
347 // if(verbose) fprintf(stderr,"Cookie: [%s]\n", cookie);
350 // if requested add an error status
351 if (request.errcode != 0) ret=MHD_queue_response (connection, request.errcode, webResponse);
352 else ret = MHD_queue_response(connection, MHD_HTTP_OK, webResponse);
354 MHD_destroy_response(webResponse);
355 json_object_put(request.jresp); // decrease reference rqtcount to free the json object
360 serialized = json_object_to_json_string(errMessage);
361 webResponse = MHD_create_response_from_buffer(strlen(serialized), (void*) serialized, MHD_RESPMEM_MUST_COPY);
362 ret = MHD_queue_response(connection, MHD_HTTP_BAD_REQUEST, webResponse);
363 MHD_destroy_response(webResponse);
364 json_object_put(errMessage); // decrease reference rqtcount to free the json object
369 // Loop on plugins. Check that they have the right type, prepare a JSON object with prefix
370 STATIC AFB_plugin ** RegisterJsonPlugins(AFB_plugin **plugins) {
373 for (idx = 0; plugins[idx] != NULL; idx++) {
374 if (plugins[idx]->type != AFB_PLUGIN_JSON) {
375 fprintf(stderr, "ERROR: AFSV plugin[%d] invalid type=%d != %d\n", idx, AFB_PLUGIN_JSON, plugins[idx]->type);
377 // some sanity controls
378 if ((plugins[idx]->prefix == NULL) || (plugins[idx]->info == NULL) || (plugins[idx]->apis == NULL)) {
379 if (plugins[idx]->prefix == NULL) plugins[idx]->prefix = "No URL prefix for APIs";
380 if (plugins[idx]->info == NULL) plugins[idx]->info = "No Info describing plugin APIs";
381 fprintf(stderr, "ERROR: plugin[%d] invalid prefix=%s info=%s", idx, plugins[idx]->prefix, plugins[idx]->info);
385 if (verbose) fprintf(stderr, "Loading plugin[%d] prefix=[%s] info=%s\n", idx, plugins[idx]->prefix, plugins[idx]->info);
387 // Prebuild plugin jtype to boost API response
388 plugins[idx]->jtype = json_object_new_string(plugins[idx]->prefix);
389 json_object_get(plugins[idx]->jtype); // increase reference count to make it permanent
390 plugins[idx]->prefixlen = strlen(plugins[idx]->prefix);
393 // Prebuild each API jtype to boost API json response
394 for (jdx = 0; plugins[idx]->apis[jdx].name != NULL; jdx++) {
395 AFB_privateApi *private = malloc (sizeof (AFB_privateApi));
396 if (plugins[idx]->apis[jdx].private != NULL) {
397 fprintf (stderr, "WARNING: plugin=%s api=%s private handle should be NULL=0x%x\n"
398 ,plugins[idx]->prefix,plugins[idx]->apis[jdx].name, plugins[idx]->apis[jdx].private);
400 private->len = strlen (plugins[idx]->apis[jdx].name);
401 private->jtype=json_object_new_string(plugins[idx]->apis[jdx].name);
402 json_object_get(private->jtype); // increase reference count to make it permanent
403 plugins[idx]->apis[jdx].private = private;
410 void initPlugins(AFB_session *session) {
411 static AFB_plugin * plugins[10];
412 afbJsonType = json_object_new_string (AFB_MSG_JTYPE);
415 plugins[i++] = afsvRegister(session),
416 plugins[i++] = dbusRegister(session),
417 plugins[i++] = alsaRegister(session),
418 #ifdef HAVE_RADIO_PLUGIN
419 plugins[i++] = radioRegister(session),
423 // complete plugins and save them within current sessions
424 session->plugins = RegisterJsonPlugins(plugins);