2 Copyright (C) 2015-2018 IoT.bzh
4 author: José Bollo <jose.bollo@iot.bzh>
6 Licensed under the Apache License, Version 2.0 (the "License");
7 you may not use this file except in compliance with the License.
8 You may obtain a copy of the License at
10 http://www.apache.org/licenses/LICENSE-2.0
12 Unless required by applicable law or agreed to in writing, software
13 distributed under the License is distributed on an "AS IS" BASIS,
14 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15 See the License for the specific language governing permissions and
16 limitations under the License.
27 #include <sys/types.h>
29 #include <json-c/json.h>
31 #include "utils-json.h"
32 #include "utils-systemd.h"
33 #include "utils-file.h"
37 static const char x_afm_prefix[] = "X-AFM-";
38 static const char service_extension[] = ".service";
39 static const char key_unit_path[] = "-unit-path";
40 static const char key_unit_name[] = "-unit-name";
41 static const char key_unit_scope[] = "-unit-scope";
42 static const char scope_user[] = "user";
43 static const char scope_system[] = "system";
44 static const char key_id[] = "id";
46 #define x_afm_prefix_length (sizeof x_afm_prefix - 1)
47 #define service_extension_length (sizeof service_extension - 1)
50 * The structure afm_apps records the data about applications
51 * for several accesses.
54 struct json_object *prvarr; /* array of the private data of apps */
55 struct json_object *pubarr; /* array of the public data of apps */
56 struct json_object *pubobj; /* hash of application's publics */
57 struct json_object *prvobj; /* hash of application's privates */
61 * The structure afm_udb records the applications
62 * for a set of directories recorded as a linked list
65 struct afm_apps applications; /* the data about applications */
66 int refcount; /* count of references to the structure */
67 int system; /* is managing system units? */
68 int user; /* is managing user units? */
69 size_t prefixlen; /* length of the prefix */
70 char prefix[1]; /* filtering prefix */
74 * The structure afm_updt is internally used for updates
77 struct afm_udb *afudb;
78 struct afm_apps applications;
82 * The default language
84 static char *default_lang;
87 * Release the data of the afm_apps object 'apps'.
89 static void apps_put(struct afm_apps *apps)
91 json_object_put(apps->prvarr);
92 json_object_put(apps->pubarr);
93 json_object_put(apps->pubobj);
94 json_object_put(apps->prvobj);
98 * Append the field 'data' to the field 'name' of the 'object'.
99 * When a second append is done to one field, it is automatically
100 * transformed to an array.
101 * Return 0 in case of success or -1 in case of error.
103 static int append_field(
104 struct json_object *object,
106 struct json_object *data
109 struct json_object *item, *array;
111 if (!json_object_object_get_ex(object, name, &item))
112 json_object_object_add(object, name, data);
114 if (json_object_is_type(item, json_type_array))
117 array = json_object_new_array();
120 json_object_array_add(array, json_object_get(item));
121 json_object_object_add(object, name, array);
123 json_object_array_add(array, data);
127 json_object_put(data);
133 * Adds the field of 'name' and 'value' in 'priv' and also if possible in 'pub'
134 * Returns 0 on success or -1 on error.
136 static int add_field(
137 struct json_object *priv,
138 struct json_object *pub,
145 struct json_object *v;
147 /* try to adapt the value to its type */
149 ival = strtol(value, &end, 10);
150 if (*value && !*end && !errno) {
152 v = json_object_new_int64(ival);
155 v = json_object_new_string(value);
163 if (name[0] == '-') {
164 append_field(priv, &name[1], v);
166 append_field(priv, name, json_object_get(v));
167 append_field(pub, name, v);
173 * Adds the field of 'name' and 'value' in 'priv' and also if possible in 'pub'
174 * Returns 0 on success or -1 on error.
176 static int add_fields_of_content(
177 struct json_object *priv,
178 struct json_object *pub,
183 char *name, *value, *read, *write;
185 read = strstr(content, x_afm_prefix);
187 name = read + x_afm_prefix_length;
188 value = strchr(name, '=');
190 read = strstr(name, x_afm_prefix);
193 read = write = value;
194 while(*read && *read != '\n') {
199 case 'n': *write++ = '\n'; break;
200 case '\n': *write++ = ' '; break;
201 default: *write++ = '\\'; *write++ = *read; break;
206 read = strstr(read, x_afm_prefix);
208 if (add_field(priv, pub, name, value) < 0)
216 * Adds the application widget 'desc' of the directory 'path' to the
217 * afm_apps object 'apps'.
218 * Returns 0 in case of success.
219 * Returns -1 and set errno in case of error
222 struct afm_apps *apps,
224 const char *unitpath,
225 const char *unitname,
230 struct json_object *priv, *pub, *id;
234 /* create the application structure */
235 priv = json_object_new_object();
239 pub = json_object_new_object();
243 /* make the unit name */
244 len = strlen(unitname);
245 assert(len >= (sizeof service_extension - 1));
246 assert(!memcmp(&unitname[len - (sizeof service_extension - 1)], service_extension, sizeof service_extension));
248 /* adds the values */
249 if (add_fields_of_content(priv, pub, content, length)
250 || add_field(priv, pub, key_unit_path, unitpath)
251 || add_field(priv, pub, key_unit_name, unitname)
252 || add_field(priv, pub, key_unit_scope, isuser ? scope_user : scope_system))
256 if (!json_object_object_get_ex(pub, key_id, &id)) {
260 strid = json_object_get_string(id);
262 /* record the application structure */
263 json_object_get(pub);
264 json_object_array_add(apps->pubarr, pub);
265 json_object_object_add(apps->pubobj, strid, pub);
266 json_object_get(priv);
267 json_object_array_add(apps->prvarr, priv);
268 json_object_object_add(apps->prvobj, strid, priv);
272 json_object_put(pub);
273 json_object_put(priv);
278 * Crop and trim unit 'content' of 'length'. Return the new length.
280 static size_t crop_and_trim_unit_content(char *content, size_t length)
283 char c, *read, *write;
285 /* removes any comment and join continued lines */
287 read = write = content;
289 do { c = *read++; } while (c == '\r');
294 /* state 0: begin of a line */
295 if (c == ';' || c == '#') {
296 st = 3; /* removes lines starting with ; or # */
300 break; /* removes empty lines */
305 /* state 1: emitting a normal line */
315 /* state 2: character after '\' */
322 /* state 3: inside a comment, wait its end */
331 return (size_t)(write - content);
337 static int read_unit_file(const char *path, char **content, size_t *length)
343 rc = getfile(path, content, length);
345 /* crop and trim it */
346 *length = nl = crop_and_trim_unit_content(*content, *length);
347 *content = realloc(*content, nl + 1);
353 * called for each unit
355 static int update_cb(void *closure, const char *name, const char *path, int isuser)
357 struct afm_updt *updt = closure;
362 /* prefix filtering */
363 length = updt->afudb->prefixlen;
364 if (length && strncmp(updt->afudb->prefix, name, length))
368 length = strlen(name);
369 if (length < service_extension_length || strcmp(service_extension, name + length - service_extension_length))
373 rc = read_unit_file(path, &content, &length);
377 /* process the file */
378 rc = addunit(&updt->applications, isuser, path, name, content, length);
380 ERROR("Ignored boggus unit %s (error: %m)", path); */
386 * Creates an afm_udb object and returns it with one reference added.
387 * Return NULL with errno = ENOMEM if memory exhausted.
389 struct afm_udb *afm_udb_create(int sys, int usr, const char *prefix)
392 struct afm_udb *afudb;
394 length = prefix ? strlen(prefix) : 0;
395 afudb = malloc(length + sizeof * afudb);
400 afudb->applications.prvarr = NULL;
401 afudb->applications.pubarr = NULL;
402 afudb->applications.pubobj = NULL;
403 afudb->applications.prvobj = NULL;
406 afudb->prefixlen = length;
408 memcpy(afudb->prefix, prefix, length);
409 afudb->prefix[length] = 0;
410 if (afm_udb_update(afudb) < 0) {
411 afm_udb_unref(afudb);
419 * Adds a reference to an existing afm_udb.
421 void afm_udb_addref(struct afm_udb *afudb)
428 * Removes a reference to an existing afm_udb object.
429 * Removes the objet if there no more reference to it.
431 void afm_udb_unref(struct afm_udb *afudb)
434 if (!--afudb->refcount) {
435 /* no more reference, clean the memory used by the object */
436 apps_put(&afudb->applications);
442 * Regenerate the list of applications of the afm_bd object 'afudb'.
443 * Returns 0 in case of success.
444 * Returns -1 and set errno in case of error
446 int afm_udb_update(struct afm_udb *afudb)
448 struct afm_updt updt;
452 afm_udb_addref(afudb);
455 /* create the result */
456 updt.applications.prvarr = json_object_new_array();
457 updt.applications.pubarr = json_object_new_array();
458 updt.applications.pubobj = json_object_new_object();
459 updt.applications.prvobj = json_object_new_object();
460 if (updt.applications.pubarr == NULL
461 || updt.applications.prvarr == NULL
462 || updt.applications.pubobj == NULL
463 || updt.applications.prvobj == NULL) {
470 if (systemd_unit_list(1, update_cb, &updt) < 0)
473 if (systemd_unit_list(0, update_cb, &updt) < 0)
476 /* commit the result */
477 tmp = afudb->applications;
478 afudb->applications = updt.applications;
480 afm_udb_unref(afudb);
484 apps_put(&updt.applications);
485 afm_udb_unref(afudb);
490 * set the default language to 'lang'
492 void afm_udb_set_default_lang(const char *lang)
494 char *oldval = default_lang;
495 default_lang = lang ? strdup(lang) : NULL;
500 * Get the list of the applications private data of the afm_udb object 'afudb'.
501 * The list is returned as a JSON-array that must be released using
503 * Returns NULL in case of error.
505 struct json_object *afm_udb_applications_private(struct afm_udb *afudb, int uid)
507 return json_object_get(afudb->applications.prvarr);
511 * Get the list of the applications public data of the afm_udb object 'afudb'.
512 * The list is returned as a JSON-array that must be released using
514 * Returns NULL in case of error.
516 struct json_object *afm_udb_applications_public(struct afm_udb *afudb, int uid, const char *lang)
518 return json_object_get(afudb->applications.pubarr);
522 * Get the private data of the applications of 'id' in the afm_udb object 'afudb'.
523 * It returns a JSON-object that must be released using 'json_object_put'.
524 * Returns NULL in case of error.
526 static struct json_object *get_no_case(struct json_object *object, const char *id, int uid, const char *lang)
528 struct json_object *result;
529 struct json_object_iter i;
531 /* search case sensitively */
532 if (json_object_object_get_ex(object, id, &result))
533 return json_object_get(result);
535 /* fallback to a case insensitive search */
536 json_object_object_foreachC(object, i) {
537 if (!strcasecmp(i.key, id))
538 return json_object_get(i.val);
544 * Get the private data of the applications of 'id' in the afm_udb object 'afudb'.
545 * It returns a JSON-object that must be released using 'json_object_put'.
546 * Returns NULL in case of error.
548 struct json_object *afm_udb_get_application_private(struct afm_udb *afudb, const char *id, int uid)
550 return get_no_case(afudb->applications.prvobj, id, uid, NULL);
554 * Get the public data of the applications of 'id' in the afm_udb object 'afudb'.
555 * It returns a JSON-object that must be released using 'json_object_put'.
556 * Returns NULL in case of error.
558 struct json_object *afm_udb_get_application_public(struct afm_udb *afudb,
559 const char *id, int uid, const char *lang)
561 return get_no_case(afudb->applications.pubobj, id, uid, lang);
566 #if defined(TESTAPPFWK)
570 struct afm_udb *afudb = afm_udb_create(1, 1, NULL);
571 printf("array = %s\n", json_object_to_json_string_ext(afudb->applications.pubarr, 3));
572 printf("pubobj = %s\n", json_object_to_json_string_ext(afudb->applications.pubobj, 3));
573 printf("prvobj = %s\n", json_object_to_json_string_ext(afudb->applications.prvobj, 3));