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#include <stdlib.h>
#include <string.h>
#include <curl/curl.h>
#define TOKEN_URL "https://%s/oauth/access_token"
#define TOKEN_URL_LEN strlen(TOKEN_URL) - strlen("%s")
#define TOKEN_POST "client_id=%s&client_secret=%s&code=%s"
#define TOKEN_POST_LEN strlen(TOKEN_POST) - strlen("%s") * 3
#define TOKEN_HEADER "X-Shopify-Access-Token: %s"
#define TOKEN_HEADER_LEN strlen(TOKEN_HEADER) - strlen("%s")
static size_t append(char *data, size_t size, size_t nmemb, char **res)
{
size_t realsize = size * nmemb;
size_t res_len = *res ? strlen(*res) : 0;
*res = realloc(*res, res_len + realsize + 1);
strlcpy(&(*res)[res_len], data, realsize + 1);
return realsize;
}
static inline void request_gettoken(const char *host, const char *key,
const char *secret_key, const char *code, char **json)
{
CURL *curl = curl_easy_init();
char url[TOKEN_URL_LEN + strlen(host) + 1];
sprintf(url, TOKEN_URL, host);
curl_easy_setopt(curl, CURLOPT_URL, url);
char post[TOKEN_POST_LEN + strlen(key) + strlen(secret_key)
+ strlen(code) + 1];
sprintf(post, TOKEN_POST, key, secret_key, code);
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, post);
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, append);
curl_easy_setopt(curl, CURLOPT_WRITEDATA, json);
curl_easy_perform(curl);
curl_easy_cleanup(curl);
}
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