feat: 组合订阅支持手动设置流量信息. 支持使用链接. 此时使用响应内容

backend/package.json

@@ -1,6 +1,6 @@
 {
   "name": "sub-store",
-  "version": "2.14.448",
+  "version": "2.14.449",
   "description": "Advanced Subscription Manager for QX, Loon, Surge, Stash and ShadowRocket.",
   "main": "src/main.js",
   "scripts": {

backend/src/restful/download.js

@@ -375,13 +375,12 @@ async function downloadCollection(req, res) {
                 proxy,
                 noCache,
             });
-
+            let subUserInfoOfSub;
             // forward flow header from the first subscription in this collection
             const allSubs = $.read(SUBS_KEY);
             const subnames = collection.subscriptions;
             if (subnames.length > 0) {
                 const sub = findByName(allSubs, subnames[0]);
-                let flowInfo;
                 if (
                     sub.source !== 'local' ||
                     ['localFirst', 'remoteFirst'].includes(sub.mergeSources)
@@ -415,16 +414,13 @@ async function downloadCollection(req, res) {
                             }
                         }
                         if (!$arguments.noFlow) {
-                            flowInfo = await getFlowHeaders(
+                            subUserInfoOfSub = await getFlowHeaders(
                                 $arguments?.insecure ? `${url}#insecure` : url,
                                 $arguments.flowUserAgent,
                                 undefined,
                                 proxy || sub.proxy || collection.proxy,
                                 $arguments.flowUrl,
                             );
-                            if (flowInfo) {
-                                res.set('subscription-userinfo', flowInfo);
-                            }
                         }
                     } catch (err) {
                         $.error(
@@ -455,13 +451,41 @@ async function downloadCollection(req, res) {
                     } else {
                         subUserInfo = sub.subUserinfo;
                     }
-                    res.set(
+                    subUserInfoOfSub = [subUserInfo, subUserInfoOfSub]
-                        'subscription-userinfo',
+                        .filter((i) => i)
-                        [subUserInfo, flowInfo].filter((i) => i).join('; '),
+                        .join('; ');
-                    );
                 }
             }
 
+            $.info(`组合订阅 ${name} 透传的的流量信息: ${subUserInfoOfSub}`);
+
+            let subUserInfoOfCol;
+            if (/^https?:\/\//.test(collection.subUserinfo)) {
+                try {
+                    subUserInfoOfCol = await getFlowHeaders(
+                        undefined,
+                        undefined,
+                        undefined,
+                        proxy || collection.proxy,
+                        collection.subUserinfo,
+                    );
+                } catch (e) {
+                    $.error(
+                        `组合订阅 ${name} 使用自定义流量链接 ${
+                            collection.subUserinfo
+                        } 获取流量信息时发生错误: ${JSON.stringify(e)}`,
+                    );
+                }
+            } else {
+                subUserInfoOfCol = collection.subUserinfo;
+            }
+            res.set(
+                'subscription-userinfo',
+                [subUserInfoOfCol, subUserInfoOfSub]
+                    .filter((i) => i)
+                    .join('; '),
+            );
+
             if (platform === 'JSON') {
                 if (resultFormat === 'nezha') {
                     output = nezhaTransform(output);