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token.c
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token.c
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#include "token.h"
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <event2/buffer.h>
#include <json.h>
#include "verbose.h"
static int copy_value_to_token_int(int *target, struct json_object *obj, const char *key)
{
struct json_object *value;
int ret;
if (json_object_object_get_ex(obj, key, &value)) {
*target = json_object_get_int(value);
verbose(VERBOSE, "%s(): %s -> %d\n", __func__, key, *target);
ret = 0;
} else {
ret = EINVAL;
}
return ret;
}
static int copy_value_to_token_string(char **target, struct json_object *obj, const char *key)
{
struct json_object *value;
int ret;
if (json_object_object_get_ex(obj, key, &value)) {
*target = strdup(json_object_get_string(value));
verbose(VERBOSE, "%s(): %s -> %s\n", __func__, key, *target);
ret = 0;
} else {
ret = EINVAL;
}
return ret;
}
static int build_token_into(struct access_token *token, struct json_object *obj)
{
int err;
verbose(FIREHOSE, "%s(): Building token from %p (type '%s')\n",
__func__, obj, json_type_to_name(json_object_get_type(obj)));
err = copy_value_to_token_string(&token->access_token, obj, "access_token");
if (err != 0) {
verbose(ERROR, "%s(): No 'access_token' member in token json (%s)\n",
__func__, strerror(err));
return err;
}
err = copy_value_to_token_int(&token->expires_in, obj, "expires_in");
if (err != 0) {
verbose(ERROR, "%s(): No 'expires_in' member in token json (%s)\n",
__func__, strerror(err));
}
return err;
}
int token_parse_json(struct access_token **tokenp, struct evbuffer *buf)
{
char cbuf[1024];
int removed;
int ret;
struct access_token *token;
struct json_tokener *tokener;
enum json_tokener_error jerr;
struct json_object *obj;
tokener = json_tokener_new();
if (tokener == NULL) {
return ENOMEM;
}
do {
removed = evbuffer_remove(buf, cbuf, sizeof(cbuf));
obj = json_tokener_parse_ex(tokener, cbuf, removed);
jerr = json_tokener_get_error(tokener);
verbose(FIREHOSE, "%s(): Passed %d bytes, result %p (%s), remaining %zd\n",
__func__, removed, obj, json_tokener_error_desc(jerr),
evbuffer_get_length(buf));
} while (obj == NULL && jerr == json_tokener_continue && evbuffer_get_length(buf) > 0);
json_tokener_free(tokener);
if (obj != NULL) {
token = malloc(sizeof(*token));
if (token == NULL) {
ret = ENOMEM;
} else {
memset(token, 0, sizeof(*token));
ret = build_token_into(token, obj);
if (ret != 0) {
token_free(token);
}
}
} else {
verbose(FIREHOSE, "%s(): json tokener reported: %s\n",
__func__, json_tokener_error_desc(jerr));
}
json_object_put(obj);
if (ret == 0) {
*tokenp = token;
}
return ret;
}
void token_free(struct access_token *token)
{
free(token->access_token);
free(token);
}