2 * Copyright 2016 IoT.bzh
3 * Author: José Bollo <jose.bollo@iot.bzh>
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
26 #include <json-c/json.h>
29 #include "afb-ws-json.h"
30 #include "afb-msg-json.h"
32 #include "afb-req-itf.h"
34 #include "afb-context.h"
36 static void aws_on_hangup(struct afb_ws_json *ws);
37 static void aws_on_text(struct afb_ws_json *ws, char *text, size_t size);
39 static struct afb_ws_itf aws_itf = {
40 .on_hangup = (void*)aws_on_hangup,
41 .on_text = (void*)aws_on_text
48 void (*cleanup)(void*);
49 void *cleanup_closure;
50 struct afb_wsreq *requests;
51 struct AFB_clientCtx *session;
52 struct json_tokener *tokener;
56 static void aws_send_event(struct afb_ws_json *ws, const char *event, struct json_object *object);
58 static const struct afb_event_listener_itf event_listener_itf = {
59 .send = (void*)aws_send_event,
63 static inline struct afb_event_listener listener_for(struct afb_ws_json *aws)
65 return (struct afb_event_listener){ .itf = &event_listener_itf, .closure = aws };
68 struct afb_ws_json *afb_ws_json_create(int fd, struct AFB_clientCtx *session, void (*cleanup)(void*), void *cleanup_closure)
70 struct afb_ws_json *result;
73 assert(session != NULL);
75 result = malloc(sizeof * result);
79 result->cleanup = cleanup;
80 result->cleanup_closure = cleanup_closure;
81 result->requests = NULL;
82 result->session = ctxClientAddRef(session);
83 if (result->session == NULL)
86 result->tokener = json_tokener_new();
87 if (result->tokener == NULL)
90 result->ws = afb_ws_create(fd, &aws_itf, result);
91 if (result->ws == NULL)
94 if (0 > ctxClientEventListenerAdd(result->session, listener_for(result)))
100 afb_ws_destroy(result->ws);
102 json_tokener_free(result->tokener);
104 ctxClientUnref(result->session);
112 static void aws_on_hangup(struct afb_ws_json *ws)
114 ctxClientEventListenerRemove(ws->session, listener_for(ws));
115 afb_ws_destroy(ws->ws);
116 json_tokener_free(ws->tokener);
117 if (ws->cleanup != NULL)
118 ws->cleanup(ws->cleanup_closure);
119 ctxClientUnref(ws->session);
130 struct afb_context context;
132 struct afb_ws_json *aws;
133 struct afb_wsreq *next;
147 struct json_object *root;
150 static void wsreq_addref(struct afb_wsreq *wsreq);
151 static void wsreq_unref(struct afb_wsreq *wsreq);
152 static struct json_object *wsreq_json(struct afb_wsreq *wsreq);
153 static struct afb_arg wsreq_get(struct afb_wsreq *wsreq, const char *name);
154 static void wsreq_fail(struct afb_wsreq *wsreq, const char *status, const char *info);
155 static void wsreq_success(struct afb_wsreq *wsreq, struct json_object *obj, const char *info);
156 static const char *wsreq_raw(struct afb_wsreq *wsreq, size_t *size);
157 static void wsreq_send(struct afb_wsreq *wsreq, const char *buffer, size_t size);
160 static const struct afb_req_itf wsreq_itf = {
161 .json = (void*)wsreq_json,
162 .get = (void*)wsreq_get,
163 .success = (void*)wsreq_success,
164 .fail = (void*)wsreq_fail,
165 .raw = (void*)wsreq_raw,
166 .send = (void*)wsreq_send,
167 .context_get = (void*)afb_context_get,
168 .context_set = (void*)afb_context_set,
169 .addref = (void*)wsreq_addref,
170 .unref = (void*)wsreq_unref
173 static int aws_wsreq_parse(struct afb_wsreq *r, char *text, size_t size)
183 while(pos < end && *pos == ' ') pos++;
184 if (pos == end) goto bad_header;
185 if (*pos++ != '[') goto bad_header;
187 /* scans code: 2|3|4 */
188 while(pos < end && *pos == ' ') pos++;
189 if (pos == end) goto bad_header;
191 case '2': r->code = CALL; break;
192 case '3': r->code = RETOK; break;
193 case '4': r->code = RETERR; break;
194 default: goto bad_header;
198 while(pos < end && *pos == ' ') pos++;
199 if (pos == end) goto bad_header;
200 if (*pos++ != ',') goto bad_header;
203 while(pos < end && *pos == ' ') pos++;
204 if (pos == end) goto bad_header;
205 if (*pos++ != '"') goto bad_header;
207 while(pos < end && *pos != '"') pos++;
208 if (pos == end) goto bad_header;
209 r->idlen = (size_t)(pos++ - r->id);
212 while(pos < end && *pos == ' ') pos++;
213 if (pos == end) goto bad_header;
214 if (*pos++ != ',') goto bad_header;
216 /* scans the method if needed */
217 if (r->code == CALL) {
219 while(pos < end && *pos == ' ') pos++;
220 if (pos == end) goto bad_header;
221 if (*pos++ != '"') goto bad_header;
225 while(pos < end && *pos != '"' && *pos != '/') pos++;
226 if (pos == end) goto bad_header;
227 if (*pos != '/') goto bad_header;
228 r->apilen = (size_t)(pos++ - r->api);
229 if (r->apilen && r->api[r->apilen - 1] == '\\')
234 while(pos < end && *pos != '"') pos++;
235 if (pos == end) goto bad_header;
236 r->verblen = (size_t)(pos++ - r->verb);
239 while(pos < end && *pos == ' ') pos++;
240 if (pos == end) goto bad_header;
241 if (*pos++ != ',') goto bad_header;
245 while(pos < end && *pos == ' ') pos++;
246 if (pos == end) goto bad_header;
249 while (pos < end && (aux != 0 || (*pos != ',' && *pos != ']'))) {
250 if (pos == end) goto bad_header;
252 case '{': case '[': aux++; break;
253 case '}': case ']': if (!aux--) goto bad_header; break;
256 pos += 1 + (*pos == '\\');
257 } while(pos < end && *pos != '"');
263 if (pos > end) goto bad_header;
264 if (pos == end && aux != 0) goto bad_header;
266 r->objlen = (size_t)(pos++ - r->obj);
267 while (r->objlen && r->obj[r->objlen - 1] == ' ')
270 /* scan the token (if any) */
272 /* scans token: "token" */
273 while(pos < end && *pos == ' ') pos++;
274 if (pos == end) goto bad_header;
275 if (*pos++ != '"') goto bad_header;
277 while(pos < end && *pos != '"') pos++;
278 if (pos == end) goto bad_header;
279 r->toklen = (size_t)(pos++ - r->tok);
280 while(pos < end && *pos == ' ') pos++;
281 if (pos == end) goto bad_header;
286 if (c != ']') goto bad_header;
287 while(pos < end && *pos == ' ') pos++;
288 if (pos != end) goto bad_header;
299 static void aws_on_text(struct afb_ws_json *ws, char *text, size_t size)
302 struct afb_wsreq *wsreq;
305 wsreq = calloc(1, sizeof *wsreq);
310 if (!aws_wsreq_parse(wsreq, text, size))
313 /* fill and record the request */
314 if (wsreq->tok != NULL)
315 wsreq->tok[wsreq->toklen] = 0;
316 afb_context_init(&wsreq->context, ws->session, wsreq->tok);
317 if (!wsreq->context.invalidated)
318 wsreq->context.validated = 1;
321 wsreq->next = ws->requests;
322 ws->requests = wsreq;
326 afb_apis_call(r, &wsreq->context, wsreq->api, wsreq->apilen, wsreq->verb, wsreq->verblen);
334 afb_ws_close(ws->ws, 1008, NULL);
338 static void wsreq_addref(struct afb_wsreq *wsreq)
343 static void wsreq_unref(struct afb_wsreq *wsreq)
345 if (--wsreq->refcount == 0) {
346 afb_context_disconnect(&wsreq->context);
352 static struct json_object *wsreq_json(struct afb_wsreq *wsreq)
354 struct json_object *root = wsreq->root;
356 json_tokener_reset(wsreq->aws->tokener);
357 root = json_tokener_parse_ex(wsreq->aws->tokener, wsreq->obj, (int)wsreq->objlen);
359 /* lazy error detection of json request. Is it to improve? */
360 root = json_object_new_string_len(wsreq->obj, (int)wsreq->objlen);
367 static struct afb_arg wsreq_get(struct afb_wsreq *wsreq, const char *name)
370 struct json_object *value, *root;
372 root = wsreq_json(wsreq);
373 if (json_object_object_get_ex(root, name, &value)) {
375 arg.value = json_object_get_string(value);
384 static void aws_emit(struct afb_ws_json *aws, int code, const char *id, size_t idlen, struct json_object *data, const char *token)
389 /* pack the message */
390 msg = json_object_new_array();
391 json_object_array_add(msg, json_object_new_int(code));
392 json_object_array_add(msg, json_object_new_string_len(id, (int)idlen));
393 json_object_array_add(msg, data);
395 json_object_array_add(msg, json_object_new_string(token));
397 /* emits the reply */
398 txt = json_object_to_json_string(msg);
399 afb_ws_text(aws->ws, txt, strlen(txt));
400 json_object_put(msg);
403 static void wsreq_reply(struct afb_wsreq *wsreq, int retcode, const char *status, const char *info, json_object *resp)
405 const char *token = afb_context_sent_token(&wsreq->context);
406 aws_emit(wsreq->aws, retcode, wsreq->id, wsreq->idlen, afb_msg_json_reply(status, info, resp, token, NULL), token);
409 static void wsreq_fail(struct afb_wsreq *wsreq, const char *status, const char *info)
411 wsreq_reply(wsreq, RETERR, status, info, NULL);
414 static void wsreq_success(struct afb_wsreq *wsreq, json_object *obj, const char *info)
416 wsreq_reply(wsreq, RETOK, "success", info, obj);
419 static const char *wsreq_raw(struct afb_wsreq *wsreq, size_t *size)
421 *size = wsreq->objlen;
425 static void wsreq_send(struct afb_wsreq *wsreq, const char *buffer, size_t size)
427 afb_ws_text(wsreq->aws->ws, buffer, size);
430 static void aws_send_event(struct afb_ws_json *aws, const char *event, struct json_object *object)
432 aws_emit(aws, EVENT, event, strlen(event), afb_msg_json_event(event, object), NULL);