2 * Copyright (C) 2016, 2017 "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.
18 * This simple program expands the object { "$ref": "#/path/to/a/target" }
25 * "b": { "$ref": "#/type/a" }
29 * will be exapanded to
38 * Invocation: program [file|-]...
40 * without arguments, it reads the input.
49 #include <json-c/json.h>
51 #define oom(x) do{if(!(x)){fprintf(stderr,"out of memory\n");exit(1);}}while(0)
54 * records path to the expanded node
58 struct json_object *object; /**< node being expanded */
59 struct path *upper; /**< link to upper expanded nodes */
63 * root of the JSON being parsed
65 struct json_object *root = NULL;
66 struct json_object *d_perms = NULL;
67 struct json_object *a_perms = NULL;
68 const char *preinit = NULL;
69 const char *init = NULL;
70 const char *onevent = NULL;
71 const char *api = NULL;
72 const char *scope = NULL;
73 const char *prefix = NULL;
74 const char *postfix = NULL;
79 * Search for a reference of type "#/a/b/c" int the
82 struct json_object *search(const char *path)
85 struct json_object *i;
87 /* does it match #/ at the beginning? */
88 if (path[0] != '#' || (path[0] && path[1] != '/'))
91 /* search from root to target */
96 if (!json_object_object_get_ex(i, d, &i))
98 d = strtok(NULL, "/");
104 * Expands the node designated by path and returns its expanded form
106 struct json_object *expand_$ref(struct path path)
109 struct json_object *o, *x;
111 struct json_object_iterator ji, jn;
113 /* expansion depends of the type of the node */
114 switch (json_object_get_type(path.object)) {
115 case json_type_object:
116 /* for object, look if it contains a property "$ref" */
117 if (json_object_object_get_ex(path.object, "$ref", &o)) {
118 /* yes, reference, try to substitute its target */
119 if (!json_object_is_type(o, json_type_string)) {
120 fprintf(stderr, "found a $ref not being string. Is: %s\n", json_object_get_string(o));
123 x = search(json_object_get_string(o));
125 fprintf(stderr, "$ref not found. Was: %s\n", json_object_get_string(o));
130 if (x == p->object) {
131 fprintf(stderr, "$ref recursive. Was: %s\n", json_object_get_string(o));
136 /* cool found, return a new instance of the target */
137 return json_object_get(x);
139 /* no, expand the values */
140 ji = json_object_iter_begin(path.object);
141 jn = json_object_iter_end(path.object);
142 while (!json_object_iter_equal(&ji, &jn)) {
143 o = json_object_iter_peek_value(&ji);
144 x = expand_$ref((struct path){ .object = o, .upper = &path });
146 json_object_object_add(path.object, json_object_iter_peek_name(&ji), x);
147 json_object_iter_next(&ji);
150 case json_type_array:
151 /* expand the values of arrays */
153 n = json_object_array_length(path.object);
155 o = json_object_array_get_idx(path.object, i);
156 x = expand_$ref((struct path){ .object = o, .upper = &path });
158 json_object_array_put_idx(path.object, i, x);
163 /* otherwise no expansion */
167 /* return the given node */
171 char *cify(const char *str)
173 char *r = strdup(str);
183 char *make_info(const char *text, int split)
186 char *desc, c, buf[3];
190 /* estimated length */
194 len += 1 + ('"' == c);
197 len += 7 * (1 + len / 72);
211 else if (c == '\\') {
212 switch ((c = *b++)) {
234 if (pos >= 77 && !e) {
261 char *make_desc(struct json_object *o)
263 return make_info(json_object_to_json_string_ext(root, 0), 1);
266 struct json_object *permissions_of_verb(struct json_object *obj)
268 struct json_object *x, *y;
270 if (json_object_object_get_ex(obj, "x-permissions", &x))
273 if (json_object_object_get_ex(obj, "get", &x))
274 if (json_object_object_get_ex(x, "x-permissions", &y))
284 n = a_perms ? json_object_array_length(a_perms) : 0;
286 printf("static const struct afb_auth _afb_auths_v2_%s[] = {\n" , api);
289 printf("\t{ %s }", json_object_get_string(json_object_array_get_idx(a_perms, i)));
290 printf(",\n"+(++i == n));
296 struct json_object *new_perm(struct json_object *obj, const char *desc)
300 struct json_object *x, *y;
302 tag = obj ? json_object_to_json_string_ext(obj, 0) : desc;
303 if (!json_object_object_get_ex(d_perms, tag, &y)) {
305 d_perms = json_object_new_object();
306 a_perms = json_object_new_array();
309 asprintf(&b, "&_afb_auths_v2_%s[%d]", api, json_object_array_length(a_perms));
310 x = json_object_new_string(desc);
311 y = json_object_new_string(b);
312 json_object_array_add(a_perms, x);
313 json_object_object_add(d_perms, tag, y);
319 struct json_object *decl_perm(struct json_object *obj);
321 struct json_object *decl_perm_a(const char *op, struct json_object *obj)
325 struct json_object *x, *y;
328 i = n = obj ? json_object_array_length(obj) : 0;
330 y = decl_perm(json_object_array_get_idx(obj, --i));
336 asprintf(&a, ".type = afb_auth_%s, .first = %s, .next = %s",
337 op, json_object_get_string(y), json_object_get_string(x));
338 x = new_perm(NULL, a);
345 struct json_object *decl_perm(struct json_object *obj)
348 struct json_object *x, *y;
350 if (json_object_object_get_ex(d_perms, json_object_to_json_string_ext(obj, 0), &x))
353 if (json_object_object_get_ex(obj, "permission", &x)) {
354 asprintf(&a, ".type = afb_auth_Permission, .text = \"%s\"", json_object_get_string(x));
355 y = new_perm(obj, a);
358 else if (json_object_object_get_ex(obj, "anyOf", &x)) {
359 y = decl_perm_a("Or", x);
361 else if (json_object_object_get_ex(obj, "allOf", &x)) {
362 y = decl_perm_a("And", x);
364 else if (json_object_object_get_ex(obj, "not", &x)) {
366 asprintf(&a, ".type = afb_auth_Not, .first = %s", json_object_get_string(x));
367 y = new_perm(obj, a);
370 else if (json_object_object_get_ex(obj, "LOA", &x))
372 else if (json_object_object_get_ex(obj, "session", &x))
380 void declare_permissions(const char *name, struct json_object *obj)
382 struct json_object *p;
384 p = permissions_of_verb(obj);
390 #define SESSION_CLOSE 0x000001
391 #define SESSION_RENEW 0x000010
392 #define SESSION_CHECK 0x000100
393 #define SESSION_LOA_1 0x001000
394 #define SESSION_LOA_2 0x011000
395 #define SESSION_LOA_3 0x111000
396 #define SESSION_MASK 0x111111
399 int get_session(struct json_object *obj);
401 int get_session_a(int and, struct json_object *obj)
405 n = obj ? json_object_array_length(obj) : 0;
410 x = get_session(json_object_array_get_idx(obj, --i));
412 y = get_session(json_object_array_get_idx(obj, --i));
421 int get_session(struct json_object *obj)
425 struct json_object *x;
428 if (json_object_object_get_ex(obj, "anyOf", &x)) {
429 y = get_session_a(1, x);
431 else if (json_object_object_get_ex(obj, "allOf", &x)) {
432 y = get_session_a(0, x);
434 else if (json_object_object_get_ex(obj, "not", &x)) {
435 y = ~get_session(x) & SESSION_MASK;
437 else if (json_object_object_get_ex(obj, "LOA", &x)) {
438 switch (json_object_get_int(x)) {
439 case 3: y = SESSION_LOA_3; break;
440 case 2: y = SESSION_LOA_2; break;
441 case 1: y = SESSION_LOA_1; break;
445 else if (json_object_object_get_ex(obj, "session", &x)) {
446 a = json_object_get_string(x);
447 if (!strcmp(a, "check"))
449 else if (!strcmp(a, "close"))
452 else if (json_object_object_get_ex(obj, "token", &x)) {
453 a = json_object_get_string(x);
454 if (!strcmp(a, "refresh"))
461 void print_session(struct json_object *p)
465 s = p ? get_session(p) : 0;
467 if (s & SESSION_CHECK) {
468 printf("%s", "|AFB_SESSION_CHECK_V2" + c);
471 if (s & SESSION_LOA_3 & ~SESSION_LOA_2)
473 else if (s & SESSION_LOA_2 & ~SESSION_LOA_1)
475 else if (s & SESSION_LOA_1)
480 printf("%s%d_V2", "|AFB_SESSION_LOA_" + c, l);
483 if (s & SESSION_CLOSE) {
484 printf("%s", "|AFB_SESSION_CLOSE_V2" + c);
487 if (s & SESSION_RENEW) {
488 printf("%s", "|AFB_SESSION_REFRESH_V2" + c);
492 printf("AFB_SESSION_NONE_V2");
495 void print_verb(const char *name)
497 printf("%s%s%s" , prefix, name, postfix);
500 void print_declare_verb(const char *name, struct json_object *obj)
502 printf("%s void ", scope);
504 printf("(struct afb_req req);\n");
507 void print_struct_verb(const char *name, struct json_object *obj)
509 struct json_object *p, *i;
513 if (json_object_object_get_ex(obj, "description", &i))
514 info = json_object_get_string(i);
516 p = permissions_of_verb(obj);
529 , p && decl_perm(p) ? json_object_get_string(decl_perm(p)) : "NULL"
530 , info ? make_info(info, 0) : "NULL"
539 void enum_verbs(void (*func)(const char *name, struct json_object *obj))
541 struct json_object_iterator ji, jn;
542 struct json_object *paths, *obj;
545 /* search the verbs */
546 paths = search("#/paths");
550 /* list the verbs and sort it */
551 ji = json_object_iter_begin(paths);
552 jn = json_object_iter_end(paths);
553 while (!json_object_iter_equal(&ji, &jn)) {
554 name = json_object_iter_peek_name(&ji);
555 obj = json_object_iter_peek_value(&ji);
556 name += (*name == '/');
558 json_object_iter_next(&ji);
562 void getvarbool(int *var, const char *path, int defval)
564 struct json_object *o;
566 if (*var != 0 && *var != 1) {
568 if (o && json_object_is_type(o, json_type_boolean))
569 *var = json_object_get_boolean(o);
575 void getvar(const char **var, const char *path, const char *defval)
577 struct json_object *o;
581 if (o && json_object_is_type(o, json_type_string))
582 *var = json_object_get_string(o);
589 * process a file and prints its expansion on stdout
591 void process(char *filename)
598 if (!strcmp(filename, "-"))
599 filename = "/dev/stdin";
602 if (access(filename, R_OK)) {
603 fprintf(stderr, "can't access file %s\n", filename);
608 root = json_object_from_file(filename);
610 fprintf(stderr, "reading file %s produced null\n", filename);
614 /* create the description */
615 desc = make_desc(root);
617 /* expand references */
618 root = expand_$ref((struct path){ .object = root, .upper = NULL });
621 getvar(&api, "#/info/x-binding-c-generator/api", NULL);
622 getvar(&preinit, "#/info/x-binding-c-generator/preinit", NULL);
623 getvar(&init, "#/info/x-binding-c-generator/init", NULL);
624 getvar(&onevent, "#/info/x-binding-c-generator/onevent", NULL);
625 getvar(&scope, "#/info/x-binding-c-generator/scope", "static");
626 getvar(&prefix, "#/info/x-binding-c-generator/prefix", "afb_verb_");
627 getvar(&postfix, "#/info/x-binding-c-generator/postfix", "_cb");
628 getvarbool(&priv, "#/info/x-binding-c-generator/private", 0);
629 getvarbool(&noconc, "#/info/x-binding-c-generator/noconcurrency", 0);
630 getvar(&api, "#/info/title", "?");
632 getvar(&info, "#/info/description", NULL);
635 /* get the API name */
638 "static const char _afb_description_v2_%s[] =\n"
644 enum_verbs(declare_permissions);
646 enum_verbs(print_declare_verb);
649 "static const struct afb_verb_v2 _afb_verbs_v2_%s[] = {\n"
652 enum_verbs(print_struct_verb);
654 " { .verb = NULL }\n"
659 "%sconst struct afb_binding_v2 %s%s = {\n"
661 " .specification = _afb_description_v2_%s,\n"
663 " .verbs = _afb_verbs_v2_%s,\n"
667 " .noconcurrency = %d\n"
670 , priv ? "static " : ""
671 , priv ? "_afb_binding_v2_" : "afbBindingV2"
675 , info ? make_info(info, 0) : "NULL"
684 json_object_put(root);
688 /** process the list of files or stdin if none */
689 int main(int ac, char **av)
694 do { process(*av); } while(*++av);