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/*
* Copyright (C) 2015, 2016 "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 <time.h>
#include <pthread.h>
#include <json-c/json.h>
#include <curl/curl.h>
#include "curl-wrap.h"
#include "oidc-agent.h"
struct keyrequest {
struct keyrequest *next;
int dead;
time_t expiration;
const char *url;
const char *appli;
const char *idp;
void (*callback)(void *closure, int status, const void *buffer, size_t size);
void *closure;
json_object *token;
pthread_t tid;
};
static struct keyrequest *keyrequests = 0;
static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
static int curl_initialized = 0;
static void perform_query_callback(void *closure, int status, CURL *curl, const char *result, size_t size)
{
struct keyrequest *kr = closure;
kr->callback(kr->closure, status, result, size);
}
static void perform_query(struct keyrequest *kr)
{
CURL *curl;
curl = curl_wrap_prepare_get_url(kr->url);
if (!curl)
kr->callback(kr->closure, 0, "out of memory", 0);
else {
oidc_add_bearer(curl, kr->token);
curl_wrap_do(curl, perform_query_callback, kr);
}
}
static void token_success(void *closure, struct json_object *token)
{
struct keyrequest *kr = closure;
kr->token = token;
perform_query(kr);
}
static void token_error(void *closure, const char *message, const char *indice)
{
struct keyrequest *kr = closure;
kr->callback(kr->closure, 0, message, 0);
}
static void *kr_get_thread(void *closure)
{
struct oidc_grant_cb cb;
struct keyrequest *kr = closure;
if (!kr->appli)
perform_query(kr);
else {
cb.closure = kr;
cb.success = token_success;
cb.error = token_error;
oidc_grant_owner_password(kr->appli, kr->idp, NULL, &cb);
}
kr->dead = 1;
return NULL;
}
static void kr_free(struct keyrequest *kr)
{
json_object_put(kr->token);
free(kr);
}
static struct keyrequest *kr_alloc(
const char *url,
time_t expiration,
const char *appli,
const char *idp,
void (*callback)(void *closure, int status, const void *buffer, size_t size),
void *closure
)
{
struct keyrequest *result;
char *buf;
size_t surl, sappli, sidp;
surl = 1 + strlen(url);
sappli = appli ? 1 + strlen(appli) : 0;
sidp = idp ? 1 + strlen(idp) : 0;
result = calloc(1, surl + sappli + sidp + sizeof *result);
if (result) {
result->next = NULL;
result->dead = 0;
result->expiration = expiration;
result->callback = callback;
result->closure = closure;
result->token = NULL;
result->tid = 0;
buf = (char*)(&result[1]);
result->url = buf;
buf = mempcpy(buf, url, surl);
if (!appli)
result->appli = NULL;
else {
result->appli = buf;
buf = mempcpy(buf, appli, sappli);
}
if (!idp)
result->idp = NULL;
else {
result->idp = buf;
buf = mempcpy(buf, idp, sidp);
}
}
return result;
}
void aia_get(
const char *url,
int delay,
const char *appli,
const char *idp,
void (*callback)(void *closure, int status, const void *buffer, size_t size),
void *closure
)
{
int rc;
time_t now;
struct keyrequest **pkr, *kr, *found_kr;
/* initialize CURL component */
pthread_mutex_lock(&mutex);
if (!curl_initialized) {
curl_initialized = 1;
curl_global_init(CURL_GLOBAL_DEFAULT);
}
/* search for the same request and also cleanup deads */
now = time(NULL);
found_kr = 0;
pkr = &keyrequests;
kr = *pkr;
while (kr) {
if (now > kr->expiration) {
if (kr->dead) {
*pkr = kr->next;
kr_free(kr);
} else {
pkr = &kr->next;
}
} else {
if (!strcmp(url, kr->url))
found_kr = kr;
pkr = &kr->next;
}
kr = *pkr;
}
/* check if found and pending */
if (found_kr) {
/* found -> cancel */
pthread_mutex_unlock(&mutex);
callback(closure, 0, NULL, 0);
return;
}
/* allocates the keyrequest */
kr = kr_alloc(url, now + delay, appli, idp, callback, closure);
if (!kr) {
pthread_mutex_unlock(&mutex);
callback(closure, 0, "Out of memory", 0);
return;
}
/* link the request */
kr->next = keyrequests;
keyrequests = kr;
/* makes the request in a new thread */
rc = pthread_create(&kr->tid, 0, kr_get_thread, kr);
if (rc != 0) {
/* error, unlink */
keyrequests = kr->next;
pthread_mutex_unlock(&mutex);
kr_free(kr);
callback(closure, 0, "Can't create a new thread", 0);
return;
}
pthread_mutex_unlock(&mutex);
}
/* vim: set colorcolumn=80: */
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