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/*
* 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.
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <string.h>
#include <dlfcn.h>
#include <assert.h>
#include <afb/afb-binding-v2.h>
#include <json-c/json.h>
#include "afb-api.h"
#include "afb-api-so-v2.h"
#include "afb-apiset.h"
#include "afb-auth.h"
#include "afb-export.h"
#include "afb-evt.h"
#include "afb-context.h"
#include "afb-api-so.h"
#include "afb-xreq.h"
#include "verbose.h"
/*
* names of symbols
*/
static const char afb_api_so_v2_descriptor[] = "afbBindingV2";
static const char afb_api_so_v2_data[] = "afbBindingV2data";
/*
* Description of a binding
*/
struct api_so_v2 {
const struct afb_binding_v2 *binding; /* descriptor */
void *handle; /* context of dlopen */
struct afb_export *export; /* exportations */
};
static const struct afb_verb_v2 *search(struct api_so_v2 *desc, const char *name)
{
const struct afb_verb_v2 *verb;
verb = desc->binding->verbs;
while (verb->verb && strcasecmp(verb->verb, name))
verb++;
return verb->verb ? verb : NULL;
return NULL;
}
static void call_cb(void *closure, struct afb_xreq *xreq)
{
struct api_so_v2 *desc = closure;
const struct afb_verb_v2 *verb;
xreq->request.dynapi = (void*)desc->export; /* hack: this avoids to export afb_export structure */
verb = search(desc, xreq->request.verb);
afb_xreq_call_verb_v2(xreq, verb);
}
static int service_start_cb(void *closure, int share_session, int onneed, struct afb_apiset *apiset)
{
struct api_so_v2 *desc = closure;
return afb_export_start(desc->export, share_session, onneed, apiset);
}
static void update_hooks_cb(void *closure)
{
struct api_so_v2 *desc = closure;
afb_export_update_hook(desc->export);
}
static int get_verbosity_cb(void *closure)
{
struct api_so_v2 *desc = closure;
return afb_export_verbosity_get(desc->export);
}
static void set_verbosity_cb(void *closure, int level)
{
struct api_so_v2 *desc = closure;
afb_export_verbosity_set(desc->export, level);
}
static struct json_object *make_description_openAPIv3(struct api_so_v2 *desc)
{
char buffer[256];
const struct afb_verb_v2 *verb;
struct json_object *r, *f, *a, *i, *p, *g;
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(afb_export_apiname(desc->export)));
json_object_object_add(i, "version", json_object_new_string("0.0.0"));
json_object_object_add(i, "description", json_object_new_string(desc->binding->info ?: afb_export_apiname(desc->export)));
p = json_object_new_object();
json_object_object_add(r, "paths", p);
verb = desc->binding->verbs;
while (verb->verb) {
buffer[0] = '/';
strncpy(buffer + 1, verb->verb, sizeof buffer - 1);
buffer[sizeof buffer - 1] = 0;
f = json_object_new_object();
json_object_object_add(p, buffer, f);
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);
f = json_object_new_object();
json_object_object_add(a, "200", f);
json_object_object_add(f, "description", json_object_new_string(verb->info?:verb->verb));
verb++;
}
return r;
}
static struct json_object *describe_cb(void *closure)
{
struct api_so_v2 *desc = closure;
struct json_object *r = desc->binding->specification ? json_tokener_parse(desc->binding->specification) : NULL;
if (!r)
r = make_description_openAPIv3(desc);
return r;
}
static struct afb_api_itf so_v2_api_itf = {
.call = call_cb,
.service_start = service_start_cb,
.update_hooks = update_hooks_cb,
.get_verbosity = get_verbosity_cb,
.set_verbosity = set_verbosity_cb,
.describe = describe_cb
};
int afb_api_so_v2_add_binding(const struct afb_binding_v2 *binding, void *handle, struct afb_apiset *apiset, struct afb_binding_data_v2 *data)
{
int rc;
struct api_so_v2 *desc;
struct afb_api afb_api;
struct afb_export *export;
/* basic checks */
assert(binding);
assert(binding->api);
assert(binding->verbs);
assert(data);
/* allocates the description */
export = afb_export_create_v2(apiset, binding->api, data, binding->init, binding->onevent);
desc = calloc(1, sizeof *desc);
if (!desc || !export) {
ERROR("out of memory");
goto error;
}
desc->binding = binding;
desc->handle = handle;
desc->export = export;
/* init the binding */
if (binding->preinit) {
INFO("binding %s calling preinit function", binding->api);
rc = binding->preinit();
if (rc < 0) {
ERROR("binding %s preinit function failed...", afb_export_apiname(desc->export));
goto error;
}
}
/* records the binding */
afb_api.closure = desc;
afb_api.itf = &so_v2_api_itf;
afb_api.group = binding->noconcurrency ? export : NULL;
if (afb_apiset_add(apiset, afb_export_apiname(desc->export), afb_api) < 0) {
ERROR("binding %s can't be registered to set %s...", afb_export_apiname(desc->export), afb_apiset_name(apiset));
goto error;
}
INFO("binding %s added to set %s", afb_export_apiname(desc->export), afb_apiset_name(apiset));
return 1;
error:
afb_export_destroy(export);
free(desc);
return -1;
}
int afb_api_so_v2_add(const char *path, void *handle, struct afb_apiset *apiset)
{
const struct afb_binding_v2 *binding;
struct afb_binding_data_v2 *data;
/* retrieves the register function */
binding = dlsym(handle, afb_api_so_v2_descriptor);
data = dlsym(handle, afb_api_so_v2_data);
if (!binding && !data)
return 0;
INFO("binding [%s] looks like an AFB binding V2", path);
/* basic checks */
if (!binding || !data) {
ERROR("binding [%s] incomplete symbol set: %s is missing",
path, binding ? afb_api_so_v2_data : afb_api_so_v2_descriptor);
goto error;
}
if (binding->api == NULL || *binding->api == 0) {
ERROR("binding [%s] bad api name...", path);
goto error;
}
if (!afb_api_is_valid_name(binding->api, 1)) {
ERROR("binding [%s] invalid api name...", path);
goto error;
}
#if 0
if (binding->specification == NULL || *binding->specification == 0) {
ERROR("binding [%s] bad specification...", path);
goto error;
}
#endif
if (binding->verbs == NULL) {
ERROR("binding [%s] no verbs...", path);
goto error;
}
return afb_api_so_v2_add_binding(binding, handle, apiset, data);
error:
return -1;
}
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