add reverse proxy templates

reverse-proxy/domins.js

@@ -0,0 +1,22 @@
+// 泛域名反代
+// 在环境变量中添加 @域名前缀，例如@github=https://github.com/,则访问https://github.xxxx.xxx/时，实际访问https://github.com/
+
+export default {
+    async fetch(request, env) {
+        const url = new URL(request.url);
+        new URL(request.url)
+        let name = url.hostname.split('.')[0];
+        let target = env['@' + name];
+        if (!target) {
+            return new Response('Not Found', {
+                status: 404
+            });
+        }
+        return fetch(new Request(target + url.pathname + url.search, {
+            body: request.body,
+            headers: request.headers,
+            method: request.method,
+            redirect: request.redirect
+        }));
+    }
+};

reverse-proxy/github-releases.js

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+export default {
+    async fetch(request) {
+        const url = new URL(request.url);
+        const { hostname, pathname, search } = url;
+        if (checkUrl(pathname)) {
+            return fetch(new Request("https://github.com" + pathname + search, {
+                body: request.body,
+                headers: request.headers,
+                method: request.method,
+                redirect: request.redirect
+            }));
+        } else {
+            let tip = `GitHub 下载代理，支持 releases、archive、tags、raw 等。
+  
+使用方法：将 Github 原链接中的 【github.com】 改为 【${hostname}】。
+如：【https://github.com/a/a/releases】改为【https://${hostname}/a/a/releases】。`
+            return new Response(tip);
+        }
+    }
+};
+
+function checkUrl(u) {
+    const exp1 = "/.+?\/.+?\/(?:releases|archive|tags).*"
+    const exp2 = "/.+?\/.+?\/raw\/.*"
+    for (let ind of [exp1, exp2]) {
+        if (u.search(ind) === 0) {
+            return true
+        }
+    }
+    return false
+}

reverse-proxy/normal.js

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+export default {
+    async fetch(request) {
+        const url = new URL(request.url);
+        const { pathname, search } = url;
+        return fetch(new Request("https://github.com" + pathname + search, {
+            body: request.body,
+            headers: request.headers,
+            method: request.method,
+            redirect: request.redirect
+        }));
+    }
+};