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/*
* Copyright (C) 2016, 2017, 2018 "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.
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <fnmatch.h>
#include <json-c/json.h>
#define AFB_BINDING_VERSION 0
#include <afb/afb-binding.h>
#include "afb-api.h"
#include "afb-api-v3.h"
#include "afb-apiset.h"
#include "afb-auth.h"
#include "afb-export.h"
#include "afb-xreq.h"
#include "verbose.h"
#include "sig-monitor.h"
/*
* Description of a binding
*/
struct afb_api_v3 {
int refcount;
int count;
struct afb_verb_v3 **verbs;
const struct afb_verb_v2 *verbsv2;
const struct afb_verb_v3 *verbsv3;
struct afb_export *export;
const char *info;
};
static const char nulchar = 0;
static int verb_name_compare(const struct afb_verb_v3 *verb, const char *name)
{
return verb->glob
? fnmatch(verb->verb, name, FNM_NOESCAPE|FNM_PATHNAME|FNM_CASEFOLD|FNM_PERIOD)
: strcasecmp(verb->verb, name);
}
static struct afb_verb_v3 *search_dynamic_verb(struct afb_api_v3 *api, const char *name)
{
struct afb_verb_v3 **v, **e, *i;
v = api->verbs;
e = &v[api->count];
while (v != e) {
i = *v;
if (!verb_name_compare(i, name))
return i;
v++;
}
return 0;
}
void afb_api_v3_process_call(struct afb_api_v3 *api, struct afb_xreq *xreq)
{
const struct afb_verb_v3 *verbsv3;
const struct afb_verb_v2 *verbsv2;
const char *name;
name = xreq->request.called_verb;
/* look first in dynamic set */
verbsv3 = search_dynamic_verb(api, name);
if (!verbsv3) {
/* look then in static set */
verbsv3 = api->verbsv3;
while (verbsv3) {
if (!verbsv3->verb)
verbsv3 = 0;
else if (!verb_name_compare(verbsv3, name))
break;
else
verbsv3++;
}
}
/* is it a v3 verb ? */
if (verbsv3) {
/* yes */
xreq->request.vcbdata = verbsv3->vcbdata;
afb_xreq_call_verb_v3(xreq, verbsv3);
return;
}
/* look in legacy set */
verbsv2 = api->verbsv2;
if (verbsv2) {
while (verbsv2->verb) {
if (strcasecmp(verbsv2->verb, name))
verbsv2++;
else {
afb_xreq_call_verb_v2(xreq, verbsv2);
return;
}
}
}
afb_xreq_reply_unknown_verb(xreq);
}
static struct json_object *describe_verb_v3(const struct afb_verb_v3 *verb)
{
struct json_object *f, *a, *g;
f = json_object_new_object();
g = json_object_new_object();
json_object_object_add(f, "get", g);
a = afb_auth_json_v2(verb->auth, verb->session);
if (a)
json_object_object_add(g, "x-permissions", a);
a = json_object_new_object();
json_object_object_add(g, "responses", a);
g = json_object_new_object();
json_object_object_add(a, "200", g);
json_object_object_add(g, "description", json_object_new_string(verb->info?:verb->verb));
return f;
}
struct json_object *afb_api_v3_make_description_openAPIv3(struct afb_api_v3 *api, const char *apiname)
{
char buffer[256];
struct afb_verb_v3 **iter, **end;
const struct afb_verb_v3 *verb;
struct json_object *r, *i, *p;
r = json_object_new_object();
json_object_object_add(r, "openapi", json_object_new_string("3.0.0"));
i = json_object_new_object();
json_object_object_add(r, "info", i);
json_object_object_add(i, "title", json_object_new_string(apiname));
json_object_object_add(i, "version", json_object_new_string("0.0.0"));
json_object_object_add(i, "description", json_object_new_string(api->info));
p = json_object_new_object();
json_object_object_add(r, "paths", p);
iter = api->verbs;
end = iter + api->count;
while (iter != end) {
verb = *iter++;
buffer[0] = '/';
strncpy(buffer + 1, verb->verb, sizeof buffer - 1);
json_object_object_add(p, buffer, describe_verb_v3(verb));
}
verb = api->verbsv3;
if (verb)
while(verb->verb) {
buffer[0] = '/';
strncpy(buffer + 1, verb->verb, sizeof buffer - 1);
json_object_object_add(p, buffer, describe_verb_v3(verb));
verb++;
}
return r;
}
struct afb_api_v3 *afb_api_v3_create(
struct afb_apiset *declare_set,
struct afb_apiset *call_set,
const char *apiname,
const char *info,
int noconcurrency,
int (*preinit)(void*, struct afb_api_x3 *),
void *closure,
int copy_info
)
{
struct afb_api_v3 *api;
/* allocates the description */
api = calloc(1, sizeof *api + (copy_info && info ? 1 + strlen(info) : 0));
if (!api)
goto oom;
api->refcount = 1;
if (!info)
api->info = &nulchar;
else if (copy_info)
api->info = strcpy((char*)(api + 1), info);
else
api->info = info;
api->export = afb_export_create_v3(declare_set, call_set, apiname, api);
if (!api->export)
goto oom2;
if (afb_export_declare(api->export, noconcurrency) < 0)
goto oom3;
if (preinit && afb_export_preinit_x3(api->export, preinit, closure) < 0)
goto oom4;
return api;
oom4:
afb_export_undeclare(api->export);
oom3:
afb_export_unref(api->export);
oom2:
free(api);
oom:
ERROR("out of memory");
return NULL;
}
struct afb_api_v3 *afb_api_v3_addref(struct afb_api_v3 *api)
{
if (api)
__atomic_add_fetch(&api->refcount, 1, __ATOMIC_RELAXED);
return api;
}
void afb_api_v3_unref(struct afb_api_v3 *api)
{
if (api && !__atomic_sub_fetch(&api->refcount, 1, __ATOMIC_RELAXED)) {
afb_export_destroy(api->export);
free(api);
}
}
struct afb_export *afb_api_v3_export(struct afb_api_v3 *api)
{
return api->export;
}
void afb_api_v3_set_verbs_v2(
struct afb_api_v3 *api,
const struct afb_verb_v2 *verbs)
{
api->verbsv2 = verbs;
}
void afb_api_v3_set_verbs_v3(
struct afb_api_v3 *api,
const struct afb_verb_v3 *verbs)
{
api->verbsv3 = verbs;
}
int afb_api_v3_add_verb(
struct afb_api_v3 *api,
const char *verb,
const char *info,
void (*callback)(struct afb_req_x2 *req),
void *vcbdata,
const struct afb_auth *auth,
uint16_t session,
int glob)
{
struct afb_verb_v3 *v, **vv;
char *txt;
int i;
for (i = 0 ; i < api->count ; i++) {
v = api->verbs[i];
if (glob == v->glob && !strcasecmp(verb, v->verb)) {
/* refuse to redefine a dynamic verb */
errno = EEXIST;
return -1;
}
}
vv = realloc(api->verbs, (1 + api->count) * sizeof *vv);
if (!vv)
goto oom;
api->verbs = vv;
v = malloc(sizeof *v + (1 + strlen(verb)) + (info ? 1 + strlen(info) : 0));
if (!v)
goto oom;
v->callback = callback;
v->vcbdata = vcbdata;
v->auth = auth;
v->session = session;
v->glob = !!glob;
txt = (char*)(v + 1);
v->verb = txt;
txt = stpcpy(txt, verb);
if (!info)
v->info = NULL;
else {
v->info = ++txt;
strcpy(txt, info);
}
api->verbs[api->count++] = v;
return 0;
oom:
errno = ENOMEM;
return -1;
}
int afb_api_v3_del_verb(
struct afb_api_v3 *api,
const char *verb,
void **vcbdata)
{
struct afb_verb_v3 **v, **e, *i;
v = api->verbs;
e = &v[api->count];
while (v != e) {
i = *v++;
if (!strcasecmp(i->verb, verb)) {
api->count--;
if (vcbdata)
*vcbdata = i->vcbdata;
if (v != e)
*--v = *--e;
free(i);
return 0;
}
}
errno = ENOENT;
return -1;
}
int afb_api_v3_set_binding_fields(const struct afb_binding_v3 *desc, struct afb_api_x3 *api)
{
int rc = 0;
if (desc->verbs)
rc = afb_api_x3_set_verbs_v3(api, desc->verbs);
if (!rc && desc->onevent)
rc = afb_api_x3_on_event(api, desc->onevent);
if (!rc && desc->init)
rc = afb_api_x3_on_init(api, desc->init);
if (!rc && desc->provide_class)
rc = afb_api_x3_provide_class(api, desc->provide_class);
if (!rc && desc->require_class)
rc = afb_api_x3_require_class(api, desc->require_class);
if (!rc && desc->require_api)
rc = afb_api_x3_require_api(api, desc->require_api, 1);
return rc;
}
struct safe_preinit_data
{
int (*preinit)(struct afb_api_x3 *);
struct afb_api_x3 *api;
int result;
};
static void safe_preinit(int sig, void *closure)
{
struct safe_preinit_data *spd = closure;
if (!sig)
spd->result = spd->preinit(spd->api);
else {
spd->result = -1;
errno = EFAULT;
}
}
int afb_api_v3_safe_preinit(struct afb_api_x3 *api, int (*preinit)(struct afb_api_x3 *))
{
struct safe_preinit_data spd;
spd.preinit = preinit;
spd.api = api;
sig_monitor(60, safe_preinit, &spd);
return spd.result;
}
static int init_binding(void *closure, struct afb_api_x3 *api)
{
const struct afb_binding_v3 *desc = closure;
int rc = afb_api_v3_set_binding_fields(desc, api);
if (!rc && desc->preinit)
rc = afb_api_v3_safe_preinit(api, desc->preinit);
return rc;
}
struct afb_api_v3 *afb_api_v3_from_binding(const struct afb_binding_v3 *desc, struct afb_apiset *declare_set, struct afb_apiset * call_set)
{
return afb_api_v3_create(declare_set, call_set, desc->api, desc->info, desc->noconcurrency, init_binding, (void*)desc, 0);
}
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