fix: 修复设置写入 JSON 解析失败和 OPTIONS 预检请求问题

Coze-Commit-Type: user
Coze-User-ID: 256649704250362
Coze-Conversation-ID: 11640025

mppt_monitor/src/web_server.c

@@ -109,8 +109,10 @@ static void handle_api_data(struct mg_connection *c, struct mg_http_message *hm)
 /* ---- Handle POST /api/settings - Write device configuration ---- */
 static void handle_api_settings(struct mg_connection *c, struct mg_http_message *hm)
 {
-    /* Only accept POST */
-    if (mg_match(hm->method, mg_str("GET"), NULL)) {
+    /* Check method - support GET, POST, OPTIONS */
+    const char *method = hm->method.buf ? hm->method.buf : "";
+
+    if (strncmp(method, "GET", 3) == 0) {
         /* GET returns current settings info */
         cJSON *root = cJSON_CreateObject();
         cJSON_AddStringToObject(root, "method", "GET");
@@ -124,26 +126,44 @@ static void handle_api_settings(struct mg_connection *c, struct mg_http_message
         cJSON_AddItemToArray(writable, cJSON_CreateString("charge_mode (0-1): 0=MPPT 1=DCDC"));
         cJSON_AddItemToObject(root, "writable_registers", writable);
         char *json_str = cJSON_PrintUnformatted(root);
-        mg_http_reply(c, 200, "Content-Type: application/json\r\nAccess-Control-Allow-Origin: *\r\n", "%s", json_str);
+        mg_http_reply(c, 200, "Content-Type: application/json\r\nAccess-Control-Allow-Origin: *\r\nAccess-Control-Allow-Methods: GET, POST, OPTIONS\r\nAccess-Control-Allow-Headers: Content-Type\r\n", "%s", json_str);
         free(json_str);
         cJSON_Delete(root);
         return;
     }
 
-    if (!mg_match(hm->method, mg_str("POST"), NULL)) {
-        mg_http_reply(c, 405, "Content-Type: application/json\r\n", "{\"error\":\"Method not allowed. Use POST.\"}");
+    if (strncmp(method, "OPTIONS", 7) == 0) {
+        /* CORS preflight */
+        printf("[WEB] OPTIONS request received for %s\n", hm->uri.buf ? hm->uri.buf : "unknown");
+        mg_http_reply(c, 204, "Access-Control-Allow-Origin: *\r\nAccess-Control-Allow-Methods: GET, POST, OPTIONS\r\nAccess-Control-Allow-Headers: Content-Type\r\n", "");
+        return;
+    }
+
+    printf("[WEB] Settings request method: '%s'\n", method);
+    if (strncmp(method, "POST", 4) != 0) {
+        mg_http_reply(c, 405, "Content-Type: application/json\r\nAccess-Control-Allow-Origin: *\r\n", "{\"error\":\"Method not allowed. Use POST.\"}");
         return;
     }
 
     /* Parse JSON body */
+    if (!hm->body.buf || hm->body.len == 0) {
+        mg_http_reply(c, 400, "Content-Type: application/json\r\nAccess-Control-Allow-Origin: *\r\n",
+                      "{\"error\":\"Empty request body\"}");
+        return;
+    }
+
     char body_buf[2048];
     size_t body_len = (hm->body.len < sizeof(body_buf) - 1) ? hm->body.len : sizeof(body_buf) - 1;
     memcpy(body_buf, hm->body.buf, body_len);
     body_buf[body_len] = '\0';
 
+    printf("[WEB] Settings POST body (%zu bytes): %s\n", body_len, body_buf);
+
     cJSON *req = cJSON_Parse(body_buf);
     if (!req) {
-        mg_http_reply(c, 400, "Content-Type: application/json\r\n", "{\"error\":\"Invalid JSON body\"}");
+        printf("[WEB] Settings JSON parse failed for body: %s\n", body_buf);
+        mg_http_reply(c, 400, "Content-Type: application/json\r\nAccess-Control-Allow-Origin: *\r\n",
+                      "{\"error\":\"Invalid JSON body\"}");
         return;
     }