Move MHD access handler to the library

so the code on the app side is much simpler.
Also prepare for accessing the GraphQL Admin API.

1 files changed, 36 insertions, 6 deletions

diff --git a/request.h b/request.h
index 7c8fe99..75bfa65 100644
--- a/request.h
+++ b/request.h
@@ -6,22 +6,28 @@
 #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")
+
+#define GRAPHQL_URL "https://%s/admin/api/2022-07/graphql.json"
+#define GRAPHQL_URL_LEN strlen(GRAPHQL_URL) - strlen("%s")
+
 static inline void request_init()
 {
 	curl_global_init(CURL_GLOBAL_DEFAULT);
 }
 
-static size_t append(char *data, size_t size, size_t nmemb, char **tok)
+static size_t append(char *data, size_t size, size_t nmemb, char **json)
 {
 	size_t realsize = size * nmemb;
-	size_t tok_len = *tok ? strlen(*tok) : 0;
-	*tok = realloc(*tok, tok_len + realsize + 1);
-	strlcpy(&(*tok)[tok_len], data, realsize + 1);
+	size_t json_len = *json ? strlen(*json) : 0;
+	*json = realloc(*json, json_len + realsize + 1);
+	strlcpy(&(*json)[json_len], data, realsize + 1);
 	return realsize;
 }
 
 static inline void request_token(const char *host, const char *key,
-		const char *secret_key, const char *code, char **tok)
+		const char *secret_key, const char *code, char **json)
 {
 	CURL *curl = curl_easy_init();
 	char url[TOKEN_URL_LEN + strlen(host) + 1];
@@ -31,12 +37,36 @@ static inline void request_token(const char *host, const char *key,
 		+ strlen(code) + 1];
 	sprintf(post, TOKEN_POST, key, secret_key, code);
 	curl_easy_setopt(curl, CURLOPT_POSTFIELDS, post);
-	curl_easy_setopt(curl, CURLOPT_WRITEDATA, tok);
 	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, append);
+	curl_easy_setopt(curl, CURLOPT_WRITEDATA, json);
+#ifdef DEBUG
+	curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
+#endif
+	curl_easy_perform(curl);
+	curl_easy_cleanup(curl);
+}
+
+static inline void request_graphql(const char *query,
+		const struct shopify_session *session, char **json)
+{
+	CURL *curl = curl_easy_init();
+	char url[GRAPHQL_URL_LEN + strlen(session->shop) + 1];
+	sprintf(url, GRAPHQL_URL, session->shop);
+	curl_easy_setopt(curl, CURLOPT_URL, url);
+	struct curl_slist *list = NULL;
+	curl_slist_append(list, "Content-Type: application/json");
+	char header[TOKEN_HEADER_LEN + strlen(session->token) + 1];
+	sprintf(header, TOKEN_HEADER, session->token);
+	curl_slist_append(list, header);
+	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list);
+	curl_easy_setopt(curl, CURLOPT_POSTFIELDS, query);
+	curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, append);
+	curl_easy_setopt(curl, CURLOPT_WRITEDATA, json);
 #ifdef DEBUG
 	curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
 #endif
 	curl_easy_perform(curl);
+	curl_slist_free_all(list);
 	curl_easy_cleanup(curl);
 }