check and return mediafire response code for every api call

mfapi/apicalls.c

@@ -0,0 +1,104 @@
+/*
+ * Copyright (C) 2014 Johannes Schauer <j.schauer@email.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2, as published by
+ * the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ */
+
+#include <jansson.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "../utils/http.h"
+#include "../utils/json.h"
+
+int mfapi_check_response(json_t * response, const char *apicall)
+{
+    json_t         *j_obj;
+    int             error_code;
+
+    j_obj = json_object_get(response, "result");
+    if (j_obj == NULL || strcmp(json_string_value(j_obj), "Success") != 0) {
+        // an error occurred
+        j_obj = json_object_get(response, "message");
+        if (j_obj == NULL) {
+            fprintf(stderr, "no error message\n");
+        } else {
+            fprintf(stderr, "error message: %s\n", json_string_value(j_obj));
+        }
+        j_obj = json_object_get(response, "error");
+        if (j_obj == NULL) {
+            fprintf(stderr, "unknown error code\n");
+            error_code = -1;
+        } else {
+            fprintf(stderr, "error code: %s\n", json_string_value(j_obj));
+            error_code = atol(json_string_value(j_obj));
+            if (error_code == 0)
+                error_code = -1;
+        }
+        return error_code;
+    }
+
+    j_obj = json_object_get(response, "action");
+    if (j_obj == NULL) {
+        fprintf(stderr, "no value for action\n");
+        return -1;
+    }
+
+    if (strcmp(json_string_value(j_obj), apicall) != 0) {
+        fprintf(stderr, "expected action %s but got %s", apicall,
+                json_string_value(j_obj));
+        return -1;
+    }
+
+    return 0;
+}
+
+int mfapi_decode_common(mfhttp * conn, void *user_ptr)
+{
+    json_t         *root;
+    json_t         *node;
+    json_error_t    error;
+    int             retval;
+    char           *apicall;
+
+    if (user_ptr == NULL) {
+        fprintf(stderr, "user_ptr must not be null\n");
+        return -1;
+    }
+
+    apicall = (char *)user_ptr;
+
+    root = http_parse_buf_json(conn, 0, &error);
+
+    if (root == NULL) {
+        fprintf(stderr, "http_parse_buf_json failed at line %d\n", error.line);
+        fprintf(stderr, "error message: %s\n", error.text);
+        return -1;
+    }
+
+    node = json_object_by_path(root, "response");
+
+    retval = mfapi_check_response(node, apicall);
+    if (retval != 0) {
+        fprintf(stderr, "invalid response\n");
+        json_decref(root);
+        return retval;
+    }
+
+    json_decref(root);
+
+    return 0;
+}