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/*
* Copyright (C) 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
#define AFB_BINDING_PRAGMA_NO_VERBOSE_MACRO
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <json-c/json.h>
#include <afb/afb-binding.h>
#include "afb-context.h"
#include "afb-xreq.h"
#include "afb-evt.h"
#include "afb-msg-json.h"
#include "afb-subcall.h"
#include "afb-hook.h"
#include "afb-api.h"
#include "afb-apiset.h"
#include "jobs.h"
#include "verbose.h"
static struct json_object *xreq_json_cb(void *closure)
{
struct afb_xreq *xreq = closure;
return xreq->json ? : (xreq->json = xreq->queryitf->json(xreq));
}
static struct afb_arg xreq_get_cb(void *closure, const char *name)
{
struct afb_xreq *xreq = closure;
if (xreq->queryitf->get)
return xreq->queryitf->get(xreq, name);
else
return afb_msg_json_get_arg(xreq_json_cb(closure), name);
}
static void xreq_success_cb(void *closure, struct json_object *obj, const char *info)
{
struct afb_xreq *xreq = closure;
if (xreq->replied) {
ERROR("reply called more than one time!!");
json_object_put(obj);
} else {
xreq->replied = 1;
if (xreq->queryitf->success)
xreq->queryitf->success(xreq, obj, info);
else
xreq->queryitf->reply(xreq, 0, afb_msg_json_reply_ok(info, obj, &xreq->context, NULL));
}
}
static void xreq_fail_cb(void *closure, const char *status, const char *info)
{
struct afb_xreq *xreq = closure;
if (xreq->replied) {
ERROR("reply called more than one time!!");
} else {
xreq->replied = 1;
if (xreq->queryitf->fail)
xreq->queryitf->fail(xreq, status, info);
else
xreq->queryitf->reply(xreq, 1, afb_msg_json_reply_error(status, info, &xreq->context, NULL));
}
}
static const char *xreq_raw_cb(void *closure, size_t *size)
{
struct afb_xreq *xreq = closure;
const char *result = json_object_to_json_string(xreq_json_cb(xreq));
if (size != NULL)
*size = strlen(result);
return result;
}
static void xreq_send_cb(void *closure, const char *buffer, size_t size)
{
struct json_object *obj = json_tokener_parse(buffer);
if (!obj == !buffer)
xreq_success_cb(closure, obj, "fake send");
else
xreq_fail_cb(closure, "fake-send-failed", "fake send");
}
static void *xreq_context_get_cb(void *closure)
{
struct afb_xreq *xreq = closure;
return afb_context_get(&xreq->context);
}
static void xreq_context_set_cb(void *closure, void *value, void (*free_value)(void*))
{
struct afb_xreq *xreq = closure;
afb_context_set(&xreq->context, value, free_value);
}
static void xreq_addref_cb(void *closure)
{
struct afb_xreq *xreq = closure;
__atomic_add_fetch(&xreq->refcount, 1, __ATOMIC_RELAXED);
}
static void xreq_unref_cb(void *closure)
{
struct afb_xreq *xreq = closure;
if (!__atomic_sub_fetch(&xreq->refcount, 1, __ATOMIC_RELAXED)) {
xreq->queryitf->unref(xreq);
}
}
static void xreq_session_close_cb(void *closure)
{
struct afb_xreq *xreq = closure;
afb_context_close(&xreq->context);
}
static int xreq_session_set_LOA_cb(void *closure, unsigned level)
{
struct afb_xreq *xreq = closure;
return afb_context_change_loa(&xreq->context, level);
}
static int xreq_subscribe_cb(void *closure, struct afb_event event)
{
struct afb_xreq *xreq = closure;
return afb_xreq_subscribe(xreq, event);
}
int afb_xreq_subscribe(struct afb_xreq *xreq, struct afb_event event)
{
if (xreq->listener)
return afb_evt_add_watch(xreq->listener, event);
if (xreq->queryitf->subscribe)
return xreq->queryitf->subscribe(xreq, event);
ERROR("no event listener, subscription impossible");
errno = EINVAL;
return -1;
}
static int xreq_unsubscribe_cb(void *closure, struct afb_event event)
{
struct afb_xreq *xreq = closure;
return afb_xreq_unsubscribe(xreq, event);
}
int afb_xreq_unsubscribe(struct afb_xreq *xreq, struct afb_event event)
{
if (xreq->listener)
return afb_evt_remove_watch(xreq->listener, event);
if (xreq->queryitf->unsubscribe)
return xreq->queryitf->unsubscribe(xreq, event);
ERROR("no event listener, unsubscription impossible");
errno = EINVAL;
return -1;
}
static void xreq_subcall_cb(void *closure, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *cb_closure)
{
struct afb_xreq *xreq = closure;
if (xreq->queryitf->subcall)
xreq->queryitf->subcall(xreq, api, verb, args, callback, cb_closure);
else
afb_subcall(xreq, api, verb, args, callback, cb_closure);
}
static int xreq_subcallsync_cb(void *closure, const char *api, const char *verb, struct json_object *args, struct json_object **result)
{
struct afb_xreq *xreq = closure;
return afb_subcall_sync(xreq, api, verb, args, result);
}
static struct json_object *xreq_hooked_json_cb(void *closure)
{
struct json_object *r = xreq_json_cb(closure);
struct afb_xreq *xreq = closure;
return afb_hook_xreq_json(xreq, r);
}
static struct afb_arg xreq_hooked_get_cb(void *closure, const char *name)
{
struct afb_arg r = xreq_get_cb(closure, name);
struct afb_xreq *xreq = closure;
return afb_hook_xreq_get(xreq, name, r);
}
static void xreq_hooked_success_cb(void *closure, struct json_object *obj, const char *info)
{
struct afb_xreq *xreq = closure;
afb_hook_xreq_success(xreq, obj, info);
xreq_success_cb(closure, obj, info);
}
static void xreq_hooked_fail_cb(void *closure, const char *status, const char *info)
{
struct afb_xreq *xreq = closure;
afb_hook_xreq_fail(xreq, status, info);
xreq_fail_cb(closure, status, info);
}
static const char *xreq_hooked_raw_cb(void *closure, size_t *size)
{
size_t s;
const char *r = xreq_raw_cb(closure, size ? : &s);
struct afb_xreq *xreq = closure;
return afb_hook_xreq_raw(xreq, r, *(size ? : &s));
}
static void xreq_hooked_send_cb(void *closure, const char *buffer, size_t size)
{
struct afb_xreq *xreq = closure;
afb_hook_xreq_send(xreq, buffer, size);
xreq_send_cb(closure, buffer, size);
}
static void *xreq_hooked_context_get_cb(void *closure)
{
void *r = xreq_context_get_cb(closure);
struct afb_xreq *xreq = closure;
return afb_hook_xreq_context_get(xreq, r);
}
static void xreq_hooked_context_set_cb(void *closure, void *value, void (*free_value)(void*))
{
struct afb_xreq *xreq = closure;
afb_hook_xreq_context_set(xreq, value, free_value);
xreq_context_set_cb(closure, value, free_value);
}
static void xreq_hooked_addref_cb(void *closure)
{
struct afb_xreq *xreq = closure;
afb_hook_xreq_addref(xreq);
xreq_addref_cb(closure);
}
static void xreq_hooked_unref_cb(void *closure)
{
struct afb_xreq *xreq = closure;
afb_hook_xreq_unref(xreq);
if (!__atomic_sub_fetch(&xreq->refcount, 1, __ATOMIC_RELAXED)) {
afb_hook_xreq_end(xreq);
xreq->queryitf->unref(xreq);
}
}
static void xreq_hooked_session_close_cb(void *closure)
{
struct afb_xreq *xreq = closure;
afb_hook_xreq_session_close(xreq);
xreq_session_close_cb(closure);
}
static int xreq_hooked_session_set_LOA_cb(void *closure, unsigned level)
{
int r = xreq_session_set_LOA_cb(closure, level);
struct afb_xreq *xreq = closure;
return afb_hook_xreq_session_set_LOA(xreq, level, r);
}
static int xreq_hooked_subscribe_cb(void *closure, struct afb_event event)
{
int r = xreq_subscribe_cb(closure, event);
struct afb_xreq *xreq = closure;
return afb_hook_xreq_subscribe(xreq, event, r);
}
static int xreq_hooked_unsubscribe_cb(void *closure, struct afb_event event)
{
int r = xreq_unsubscribe_cb(closure, event);
struct afb_xreq *xreq = closure;
return afb_hook_xreq_unsubscribe(xreq, event, r);
}
struct reply
{
struct afb_xreq *xreq;
void (*callback)(void*, int, struct json_object*);
void *closure;
};
static void xreq_hooked_subcall_reply_cb(void *closure, int iserror, struct json_object *result)
{
struct reply *reply = closure;
afb_hook_xreq_subcall_result(reply->xreq, iserror, result);
reply->callback(reply->closure, iserror, result);
free(reply);
}
static void xreq_hooked_subcall_cb(void *closure, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *cb_closure)
{
struct reply *reply = malloc(sizeof *reply);
struct afb_xreq *xreq = closure;
afb_hook_xreq_subcall(xreq, api, verb, args);
if (reply) {
reply->xreq = xreq;
reply->callback = callback;
reply->closure = cb_closure;
xreq_subcall_cb(closure, api, verb, args, xreq_hooked_subcall_reply_cb, reply);
} else {
ERROR("out of memory");
xreq_subcall_cb(closure, api, verb, args, callback, cb_closure);
}
}
static int xreq_hooked_subcallsync_cb(void *closure, const char *api, const char *verb, struct json_object *args, struct json_object **result)
{
int r;
struct afb_xreq *xreq = closure;
afb_hook_xreq_subcallsync(xreq, api, verb, args);
r = xreq_subcallsync_cb(closure, api, verb, args, result);
return afb_hook_xreq_subcallsync_result(xreq, r, *result);
}
const struct afb_req_itf xreq_itf = {
.json = xreq_json_cb,
.get = xreq_get_cb,
.success = xreq_success_cb,
.fail = xreq_fail_cb,
.raw = xreq_raw_cb,
.send = xreq_send_cb,
.context_get = xreq_context_get_cb,
.context_set = xreq_context_set_cb,
.addref = xreq_addref_cb,
.unref = xreq_unref_cb,
.session_close = xreq_session_close_cb,
.session_set_LOA = xreq_session_set_LOA_cb,
.subscribe = xreq_subscribe_cb,
.unsubscribe = xreq_unsubscribe_cb,
.subcall = xreq_subcall_cb,
.subcallsync = xreq_subcallsync_cb
};
const struct afb_req_itf xreq_hooked_itf = {
.json = xreq_hooked_json_cb,
.get = xreq_hooked_get_cb,
.success = xreq_hooked_success_cb,
.fail = xreq_hooked_fail_cb,
.raw = xreq_hooked_raw_cb,
.send = xreq_hooked_send_cb,
.context_get = xreq_hooked_context_get_cb,
.context_set = xreq_hooked_context_set_cb,
.addref = xreq_hooked_addref_cb,
.unref = xreq_hooked_unref_cb,
.session_close = xreq_hooked_session_close_cb,
.session_set_LOA = xreq_hooked_session_set_LOA_cb,
.subscribe = xreq_hooked_subscribe_cb,
.unsubscribe = xreq_hooked_unsubscribe_cb,
.subcall = xreq_hooked_subcall_cb,
.subcallsync = xreq_hooked_subcallsync_cb
};
static inline struct afb_req to_req(struct afb_xreq *xreq)
{
return (struct afb_req){ .itf = xreq->hookflags ? &xreq_hooked_itf : &xreq_itf, .closure = xreq };
}
struct json_object *afb_xreq_json(struct afb_xreq *xreq)
{
return afb_req_json(to_req(xreq));
}
void afb_xreq_success(struct afb_xreq *xreq, struct json_object *obj, const char *info)
{
afb_req_success(to_req(xreq), obj, info);
}
void afb_xreq_success_f(struct afb_xreq *xreq, struct json_object *obj, const char *info, ...)
{
char *message;
va_list args;
va_start(args, info);
if (info == NULL || vasprintf(&message, info, args) < 0)
message = NULL;
va_end(args);
afb_xreq_success(xreq, obj, message);
free(message);
}
void afb_xreq_fail(struct afb_xreq *xreq, const char *status, const char *info)
{
afb_req_fail(to_req(xreq), status, info);
}
void afb_xreq_fail_f(struct afb_xreq *xreq, const char *status, const char *info, ...)
{
char *message;
va_list args;
va_start(args, info);
if (info == NULL || vasprintf(&message, info, args) < 0)
message = NULL;
va_end(args);
afb_xreq_fail(xreq, status, message);
free(message);
}
const char *afb_xreq_raw(struct afb_xreq *xreq, size_t *size)
{
return afb_req_raw(to_req(xreq), size);
}
void afb_xreq_addref(struct afb_xreq *xreq)
{
afb_req_addref(to_req(xreq));
}
void afb_xreq_unref(struct afb_xreq *xreq)
{
afb_req_unref(to_req(xreq));
}
void afb_xreq_unhooked_subcall(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *cb_closure)
{
xreq_subcall_cb(xreq, api, verb, args, callback, cb_closure);
}
void afb_xreq_subcall(struct afb_xreq *xreq, const char *api, const char *verb, struct json_object *args, void (*callback)(void*, int, struct json_object*), void *cb_closure)
{
afb_req_subcall(to_req(xreq), api, verb, args, callback, cb_closure);
}
static int xreq_session_check_apply(struct afb_xreq *xreq, int sessionflags)
{
int loa;
if ((sessionflags & (AFB_SESSION_CLOSE|AFB_SESSION_RENEW|AFB_SESSION_CHECK|AFB_SESSION_LOA_EQ)) != 0) {
if (!afb_context_check(&xreq->context)) {
afb_context_close(&xreq->context);
afb_xreq_fail_f(xreq, "failed", "invalid token's identity");
errno = EINVAL;
return -1;
}
}
if ((sessionflags & AFB_SESSION_LOA_GE) != 0) {
loa = (sessionflags >> AFB_SESSION_LOA_SHIFT) & AFB_SESSION_LOA_MASK;
if (!afb_context_check_loa(&xreq->context, loa)) {
afb_xreq_fail_f(xreq, "failed", "invalid LOA");
errno = EPERM;
return -1;
}
}
if ((sessionflags & AFB_SESSION_LOA_LE) != 0) {
loa = (sessionflags >> AFB_SESSION_LOA_SHIFT) & AFB_SESSION_LOA_MASK;
if (afb_context_check_loa(&xreq->context, loa + 1)) {
afb_xreq_fail_f(xreq, "failed", "invalid LOA");
errno = EPERM;
return -1;
}
}
if ((sessionflags & AFB_SESSION_RENEW) != 0) {
afb_context_refresh(&xreq->context);
}
if ((sessionflags & AFB_SESSION_CLOSE) != 0) {
afb_context_change_loa(&xreq->context, 0);
afb_context_close(&xreq->context);
}
return 0;
}
void afb_xreq_call_verb_v1(struct afb_xreq *xreq, const struct afb_verb_desc_v1 *verb)
{
if (!verb)
afb_xreq_fail_unknown_verb(xreq);
else
if (!xreq_session_check_apply(xreq, verb->session))
verb->callback(to_req(xreq));
}
void afb_xreq_call_verb_v2(struct afb_xreq *xreq, const struct afb_verb_v2 *verb)
{
if (!verb)
afb_xreq_fail_unknown_verb(xreq);
else
if (!xreq_session_check_apply(xreq, verb->session))
verb->callback(to_req(xreq));
}
void afb_xreq_init(struct afb_xreq *xreq, const struct afb_xreq_query_itf *queryitf)
{
memset(xreq, 0, sizeof *xreq);
xreq->refcount = 1;
xreq->queryitf = queryitf;
}
void afb_xreq_fail_unknown_api(struct afb_xreq *xreq)
{
afb_xreq_fail_f(xreq, "unknown-api", "api %s not found (for verb %s)", xreq->api, xreq->verb);
}
void afb_xreq_fail_unknown_verb(struct afb_xreq *xreq)
{
afb_xreq_fail_f(xreq, "unknown-verb", "verb %s unknown within api %s", xreq->verb, xreq->api);
}
static void process_async(int signum, void *arg)
{
struct afb_xreq *xreq = arg;
struct afb_api api;
if (signum != 0) {
afb_xreq_fail_f(xreq, "aborted", "signal %s(%d) caught", strsignal(signum), signum);
} else {
/* init hooking */
afb_hook_init_xreq(xreq);
if (xreq->hookflags)
afb_hook_xreq_begin(xreq);
/* search the api */
if (afb_apiset_get(xreq->apiset, xreq->api, &api) < 0) {
afb_xreq_fail_f(xreq, "unknown-api", "api %s not found", xreq->api);
} else {
xreq->context.api_key = api.closure;
api.itf->call(api.closure, xreq);
}
}
afb_xreq_unref(xreq);
}
void afb_xreq_process(struct afb_xreq *xreq, struct afb_apiset *apiset)
{
xreq->apiset = apiset;
afb_xreq_addref(xreq);
if (jobs_queue(NULL, afb_apiset_timeout_get(apiset), process_async, xreq) < 0) {
/* TODO: allows or not to proccess it directly as when no threading? (see above) */
ERROR("can't process job with threads: %m");
afb_xreq_fail_f(xreq, "cancelled", "not able to create a job for the task");
afb_xreq_unref(xreq);
}
afb_xreq_unref(xreq);
}
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