--- /dev/null
+/*
+ * Copyright (C) 2016, 2017 "IoT.bzh"
+ * Author José Bollo <jose.bollo@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/*
+ * This simple program expands the object { "$ref": "#/path/to/a/target" }
+ *
+ * For example:
+ *
+ * {
+ * "type":{
+ * "a": "int",
+ * "b": { "$ref": "#/type/a" }
+ * }
+ * }
+ *
+ * will be exapanded to
+ *
+ * {
+ * "type":{
+ * "a": "int",
+ * "b": "int"
+ * }
+ * }
+ *
+ * Invocation: program [file|-]...
+ *
+ * without arguments, it reads the input.
+ */
+
+#define _GNU_SOURCE
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <ctype.h>
+
+#include <json-c/json.h>
+
+#define oom(x) do{if(!(x)){fprintf(stderr,"out of memory\n");exit(1);}}while(0)
+
+/**
+ * records path to the expanded node
+ */
+struct path
+{
+ struct json_object *object; /**< node being expanded */
+ struct path *upper; /**< link to upper expanded nodes */
+};
+
+/**
+ * root of the JSON being parsed
+ */
+struct json_object *root = NULL;
+struct json_object *d_perms = NULL;
+struct json_object *a_perms = NULL;
+const char *preinit = NULL;
+const char *init = NULL;
+const char *onevent = NULL;
+const char *api = NULL;
+const char *scope = NULL;
+const char *prefix = NULL;
+const char *postfix = NULL;
+char *capi = NULL;
+int priv = -1;
+int noconc = -1;
+
+/**
+ * Search for a reference of type "#/a/b/c" int the
+ * parsed JSON object
+ */
+struct json_object *search(const char *path)
+{
+ char *d;
+ struct json_object *i;
+
+ /* does it match #/ at the beginning? */
+ if (path[0] != '#' || (path[0] && path[1] != '/'))
+ return NULL;
+
+ /* search from root to target */
+ i = root;
+ d = strdupa(path+2);
+ d = strtok(d, "/");
+ while(i && d) {
+ if (!json_object_object_get_ex(i, d, &i))
+ return NULL;
+ d = strtok(NULL, "/");
+ }
+ return i;
+}
+
+/**
+ * Expands the node designated by path and returns its expanded form
+ */
+struct json_object *expand_$ref(struct path path)
+{
+ struct path *p;
+ struct json_object *o, *x;
+ int n, i;
+ struct json_object_iterator ji, jn;
+
+ /* expansion depends of the type of the node */
+ switch (json_object_get_type(path.object)) {
+ case json_type_object:
+ /* for object, look if it contains a property "$ref" */
+ if (json_object_object_get_ex(path.object, "$ref", &o)) {
+ /* yes, reference, try to substitute its target */
+ if (!json_object_is_type(o, json_type_string)) {
+ fprintf(stderr, "found a $ref not being string. Is: %s\n", json_object_get_string(o));
+ exit(1);
+ }
+ x = search(json_object_get_string(o));
+ if (!x) {
+ fprintf(stderr, "$ref not found. Was: %s\n", json_object_get_string(o));
+ exit(1);
+ }
+ p = &path;
+ while(p) {
+ if (x == p->object) {
+ fprintf(stderr, "$ref recursive. Was: %s\n", json_object_get_string(o));
+ exit(1);
+ }
+ p = p->upper;
+ }
+ /* cool found, return a new instance of the target */
+ return json_object_get(x);
+ }
+ /* no, expand the values */
+ ji = json_object_iter_begin(path.object);
+ jn = json_object_iter_end(path.object);
+ while (!json_object_iter_equal(&ji, &jn)) {
+ o = json_object_iter_peek_value(&ji);
+ x = expand_$ref((struct path){ .object = o, .upper = &path });
+ if (x != o)
+ json_object_object_add(path.object, json_object_iter_peek_name(&ji), x);
+ json_object_iter_next(&ji);
+ }
+ break;
+ case json_type_array:
+ /* expand the values of arrays */
+ i = 0;
+ n = json_object_array_length(path.object);
+ while (i != n) {
+ o = json_object_array_get_idx(path.object, i);
+ x = expand_$ref((struct path){ .object = o, .upper = &path });
+ if (x != o)
+ json_object_array_put_idx(path.object, i, x);
+ i++;
+ }
+ break;
+ default:
+ /* otherwise no expansion */
+ break;
+ }
+
+ /* return the given node */
+ return path.object;
+}
+
+char *cify(const char *str)
+{
+ char *r = strdup(str);
+ int i = 0;
+ while (r && r[i]) {
+ if (!isalnum(r[i]))
+ r[i] = '_';
+ i++;
+ }
+ return r;
+}
+
+char *make_info(const char *text, int split)
+{
+ const char *a, *b;
+ char *desc, c, buf[3];
+ size_t len;
+ int i, pos, e;
+
+ /* estimated length */
+ a = b = text;
+ len = 1;
+ while((c = *b++)) {
+ len += 1 + ('"' == c);
+ }
+
+ len += 7 * (1 + len / 72);
+ desc = malloc(len);
+ oom(desc);
+
+ len = pos = 0;
+ if (!split)
+ desc[len++] = '"';
+ b = a;
+ while((c = *b++)) {
+ if (c == '"') {
+ buf[0] = '\\';
+ buf[1] = '"';
+ buf[2] = 0;
+ }
+ else if (c == '\\') {
+ switch ((c = *b++)) {
+ case 0:
+ b--;
+ break;
+ case '/':
+ buf[0] = '/';
+ buf[1] = 0;
+ break;
+ default:
+ buf[0] = '\\';
+ buf[1] = c;
+ buf[2] = 0;
+ break;
+ }
+ }
+ else {
+ buf[0] = c;
+ buf[1] = 0;
+ }
+ i = e = 0;
+ while (buf[i]) {
+ if (split) {
+ if (pos >= 77 && !e) {
+ desc[len++] = '"';
+ desc[len++] = '\n';
+ pos = 0;
+ }
+ if (pos == 0) {
+ desc[len++] = ' ';
+ desc[len++] = ' ';
+ desc[len++] = ' ';
+ desc[len++] = ' ';
+ desc[len++] = '"';
+ pos = 5;
+ }
+ }
+ c = buf[i++];
+ desc[len++] = c;
+ e = !e && c == '\\';
+ pos++;
+ }
+ }
+ desc[len++] = '"';
+ if (split)
+ desc[len++] = '\n';
+ desc[len] = 0;
+ return desc;
+}
+
+char *make_desc(struct json_object *o)
+{
+ return make_info(json_object_to_json_string_ext(root, 0), 1);
+}
+
+struct json_object *permissions_of_verb(struct json_object *obj)
+{
+ struct json_object *x, *y;
+
+ if (json_object_object_get_ex(obj, "x-permissions", &x))
+ return x;
+
+ if (json_object_object_get_ex(obj, "get", &x))
+ if (json_object_object_get_ex(x, "x-permissions", &y))
+ return y;
+
+ return NULL;
+}
+
+void print_perms()
+{
+ int i, n;
+
+ n = a_perms ? json_object_array_length(a_perms) : 0;
+ if (n) {
+ printf("static const struct afb_auth _afb_auths_v2_%s[] = {\n" , capi);
+ i = 0;
+ while (i < n) {
+ printf("\t{ %s }", json_object_get_string(json_object_array_get_idx(a_perms, i)));
+ printf(",\n"+(++i == n));
+ }
+ printf("};\n\n");
+ }
+}
+
+struct json_object *new_perm(struct json_object *obj, const char *desc)
+{
+ const char *tag;
+ char *b;
+ struct json_object *x, *y;
+
+ tag = obj ? json_object_to_json_string_ext(obj, 0) : desc;
+ if (!json_object_object_get_ex(d_perms, tag, &y)) {
+ if (!d_perms) {
+ d_perms = json_object_new_object();
+ a_perms = json_object_new_array();
+ }
+
+ asprintf(&b, "&_afb_auths_v2_%s[%d]", capi, json_object_array_length(a_perms));
+ x = json_object_new_string(desc);
+ y = json_object_new_string(b);
+ json_object_array_add(a_perms, x);
+ json_object_object_add(d_perms, tag, y);
+ free(b);
+ }
+ return y;
+}
+
+struct json_object *decl_perm(struct json_object *obj);
+
+struct json_object *decl_perm_a(const char *op, struct json_object *obj)
+{
+ int i, n;
+ char *a;
+ struct json_object *x, *y;
+
+ x = NULL;
+ i = n = obj ? json_object_array_length(obj) : 0;
+ while (i) {
+ y = decl_perm(json_object_array_get_idx(obj, --i));
+ if (!y)
+ ;
+ else if (!x)
+ x = y;
+ else if (x != y) {
+ asprintf(&a, ".type = afb_auth_%s, .first = %s, .next = %s",
+ op, json_object_get_string(y), json_object_get_string(x));
+ x = new_perm(NULL, a);
+ free(a);
+ }
+ }
+ return x;
+}
+
+struct json_object *decl_perm(struct json_object *obj)
+{
+ char *a;
+ struct json_object *x, *y;
+
+ if (json_object_object_get_ex(d_perms, json_object_to_json_string_ext(obj, 0), &x))
+ return x;
+
+ if (json_object_object_get_ex(obj, "permission", &x)) {
+ asprintf(&a, ".type = afb_auth_Permission, .text = \"%s\"", json_object_get_string(x));
+ y = new_perm(obj, a);
+ free(a);
+ }
+ else if (json_object_object_get_ex(obj, "anyOf", &x)) {
+ y = decl_perm_a("Or", x);
+ }
+ else if (json_object_object_get_ex(obj, "allOf", &x)) {
+ y = decl_perm_a("And", x);
+ }
+ else if (json_object_object_get_ex(obj, "not", &x)) {
+ x = decl_perm(x);
+ asprintf(&a, ".type = afb_auth_Not, .first = %s", json_object_get_string(x));
+ y = new_perm(obj, a);
+ free(a);
+ }
+ else if (json_object_object_get_ex(obj, "LOA", &x))
+ y = NULL;
+ else if (json_object_object_get_ex(obj, "session", &x))
+ y = NULL;
+ else
+ y = NULL;
+
+ return y;
+}
+
+void declare_permissions(const char *name, struct json_object *obj)
+{
+ struct json_object *p;
+
+ p = permissions_of_verb(obj);
+ if (p)
+ decl_perm(p);
+}
+
+
+#define SESSION_CLOSE 0x000001
+#define SESSION_RENEW 0x000010
+#define SESSION_CHECK 0x000100
+#define SESSION_LOA_1 0x001000
+#define SESSION_LOA_2 0x011000
+#define SESSION_LOA_3 0x111000
+#define SESSION_MASK 0x111111
+
+
+int get_session(struct json_object *obj);
+
+int get_session_a(int and, struct json_object *obj)
+{
+ int i, n, x, y;
+
+ n = obj ? json_object_array_length(obj) : 0;
+ if (n == 0)
+ return 0;
+
+ i = n;
+ x = get_session(json_object_array_get_idx(obj, --i));
+ while (i) {
+ y = get_session(json_object_array_get_idx(obj, --i));
+ if (and)
+ x &= y;
+ else
+ x |= y;
+ }
+ return x;
+}
+
+int get_session(struct json_object *obj)
+{
+ int y;
+ const char *a;
+ struct json_object *x;
+
+ y = 0;
+ if (json_object_object_get_ex(obj, "anyOf", &x)) {
+ y = get_session_a(1, x);
+ }
+ else if (json_object_object_get_ex(obj, "allOf", &x)) {
+ y = get_session_a(0, x);
+ }
+ else if (json_object_object_get_ex(obj, "not", &x)) {
+ y = ~get_session(x) & SESSION_MASK;
+ }
+ else if (json_object_object_get_ex(obj, "LOA", &x)) {
+ switch (json_object_get_int(x)) {
+ case 3: y = SESSION_LOA_3; break;
+ case 2: y = SESSION_LOA_2; break;
+ case 1: y = SESSION_LOA_1; break;
+ default: break;
+ }
+ }
+ else if (json_object_object_get_ex(obj, "session", &x)) {
+ a = json_object_get_string(x);
+ if (!strcmp(a, "check"))
+ y = SESSION_CHECK;
+ else if (!strcmp(a, "close"))
+ y = SESSION_CLOSE;
+ }
+ else if (json_object_object_get_ex(obj, "token", &x)) {
+ a = json_object_get_string(x);
+ if (!strcmp(a, "refresh"))
+ y = SESSION_RENEW;
+ }
+
+ return y;
+}
+
+void print_session(struct json_object *p)
+{
+ int s, c, l;
+
+ s = p ? get_session(p) : 0;
+ c = 1;
+ if (s & SESSION_CHECK) {
+ printf("%s", "|AFB_SESSION_CHECK_V2" + c);
+ c = 0;
+ }
+ if (s & SESSION_LOA_3 & ~SESSION_LOA_2)
+ l = 3;
+ else if (s & SESSION_LOA_2 & ~SESSION_LOA_1)
+ l = 2;
+ else if (s & SESSION_LOA_1)
+ l = 1;
+ else
+ l = 0;
+ if (l) {
+ printf("%s%d_V2", "|AFB_SESSION_LOA_" + c, l);
+ c = 0;
+ }
+ if (s & SESSION_CLOSE) {
+ printf("%s", "|AFB_SESSION_CLOSE_V2" + c);
+ c = 0;
+ }
+ if (s & SESSION_RENEW) {
+ printf("%s", "|AFB_SESSION_REFRESH_V2" + c);
+ c = 0;
+ }
+ if (c)
+ printf("AFB_SESSION_NONE_V2");
+}
+
+void print_verb(const char *name)
+{
+ printf("%s%s%s" , prefix, name, postfix);
+}
+
+void print_declare_verb(const char *name, struct json_object *obj)
+{
+ printf("%s void ", scope);
+ print_verb(name);
+ printf("(struct afb_req req);\n");
+}
+
+void print_struct_verb(const char *name, struct json_object *obj)
+{
+ struct json_object *p, *i;
+ const char *info;
+
+ info = NULL;
+ if (json_object_object_get_ex(obj, "description", &i))
+ info = json_object_get_string(i);
+
+ p = permissions_of_verb(obj);
+ printf(
+ " {\n"
+ " .verb = \"%s\",\n"
+ " .callback = "
+ , name
+ );
+ print_verb(name);
+ printf(
+ ",\n"
+ " .auth = %s,\n"
+ " .info = %s,\n"
+ " .session = "
+ , p && decl_perm(p) ? json_object_get_string(decl_perm(p)) : "NULL"
+ , info ? make_info(info, 0) : "NULL"
+ );
+ print_session(p);
+ printf(
+ "\n"
+ " },\n"
+ );
+}
+
+void enum_verbs(void (*func)(const char *name, struct json_object *obj))
+{
+ struct json_object_iterator ji, jn;
+ struct json_object *paths, *obj;
+ const char *name;
+
+ /* search the verbs */
+ paths = search("#/paths");
+ if (!paths)
+ return;
+
+ /* list the verbs and sort it */
+ ji = json_object_iter_begin(paths);
+ jn = json_object_iter_end(paths);
+ while (!json_object_iter_equal(&ji, &jn)) {
+ name = json_object_iter_peek_name(&ji);
+ obj = json_object_iter_peek_value(&ji);
+ name += (*name == '/');
+ func(name, obj);
+ json_object_iter_next(&ji);
+ }
+}
+
+void getvarbool(int *var, const char *path, int defval)
+{
+ struct json_object *o;
+
+ if (*var != 0 && *var != 1) {
+ o = search(path);
+ if (o && json_object_is_type(o, json_type_boolean))
+ *var = json_object_get_boolean(o);
+ else
+ *var = !!defval;
+ }
+}
+
+void getvar(const char **var, const char *path, const char *defval)
+{
+ struct json_object *o;
+
+ if (!*var) {
+ o = search(path);
+ if (o && json_object_is_type(o, json_type_string))
+ *var = json_object_get_string(o);
+ else
+ *var = defval;
+ }
+}
+
+/**
+ * process a file and prints its expansion on stdout
+ */
+void process(char *filename)
+{
+ char *desc;
+ const char *info;
+
+ /* translate - */
+ if (!strcmp(filename, "-"))
+ filename = "/dev/stdin";
+
+ /* check access */
+ if (access(filename, R_OK)) {
+ fprintf(stderr, "can't access file %s\n", filename);
+ exit(1);
+ }
+
+ /* read the file */
+ root = json_object_from_file(filename);
+ if (!root) {
+ fprintf(stderr, "reading file %s produced null\n", filename);
+ exit(1);
+ }
+
+ /* create the description */
+ desc = make_desc(root);
+
+ /* expand references */
+ root = expand_$ref((struct path){ .object = root, .upper = NULL });
+
+ /* get some names */
+ getvar(&api, "#/info/x-binding-c-generator/api", NULL);
+ getvar(&preinit, "#/info/x-binding-c-generator/preinit", NULL);
+ getvar(&init, "#/info/x-binding-c-generator/init", NULL);
+ getvar(&onevent, "#/info/x-binding-c-generator/onevent", NULL);
+ getvar(&scope, "#/info/x-binding-c-generator/scope", "static");
+ getvar(&prefix, "#/info/x-binding-c-generator/prefix", "afb_verb_");
+ getvar(&postfix, "#/info/x-binding-c-generator/postfix", "_cb");
+ getvarbool(&priv, "#/info/x-binding-c-generator/private", 0);
+ getvarbool(&noconc, "#/info/x-binding-c-generator/noconcurrency", 0);
+ getvar(&api, "#/info/title", "?");
+ info = NULL;
+ getvar(&info, "#/info/description", NULL);
+ capi = cify(api);
+
+ /* get the API name */
+ printf(
+ "\n"
+ "static const char _afb_description_v2_%s[] =\n"
+ "%s"
+ ";\n"
+ "\n"
+ , capi, desc
+ );
+ enum_verbs(declare_permissions);
+ print_perms();
+ enum_verbs(print_declare_verb);
+ printf(
+ "\n"
+ "static const struct afb_verb_v2 _afb_verbs_v2_%s[] = {\n"
+ , capi
+ );
+ enum_verbs(print_struct_verb);
+ printf(
+ " {\n"
+ " .verb = NULL,\n"
+ " .callback = NULL,\n"
+ " .auth = NULL,\n"
+ " .info = NULL,\n"
+ " .session = 0\n"
+ " }\n"
+ "};\n"
+ );
+ printf(
+ "\n"
+ "%sconst struct afb_binding_v2 %s%s = {\n"
+ " .api = \"%s\",\n"
+ " .specification = _afb_description_v2_%s,\n"
+ " .info = %s,\n"
+ " .verbs = _afb_verbs_v2_%s,\n"
+ " .preinit = %s,\n"
+ " .init = %s,\n"
+ " .onevent = %s,\n"
+ " .noconcurrency = %d\n"
+ "};\n"
+ "\n"
+ , priv ? "static " : ""
+ , priv ? "_afb_binding_v2_" : "afbBindingV2"
+ , priv ? capi : ""
+ , api
+ , capi
+ , info ? make_info(info, 0) : "NULL"
+ , capi
+ , preinit ?: "NULL"
+ , init ?: "NULL"
+ , onevent ?: "NULL"
+ , !!noconc
+ );
+
+ /* clean up */
+ json_object_put(root);
+ free(desc);
+}
+
+/** process the list of files or stdin if none */
+int main(int ac, char **av)
+{
+ if (!*++av)
+ process("-");
+ else {
+ do { process(*av); } while(*++av);
+ }
+ return 0;
+}
+
+
+
+
+
Code Review / src / app-framework-binder.git / blobdiff