Add pac file (#264)

Co-authored-by: daiwentao <daiwentao@xiaomi.com>

Author: dwt0317

mi.pac

@@ -0,0 +1,100 @@
+// Helper function to check if a string is an IP address
+function isIP(host) {
+    var parts = host.split(".");
+    if (parts.length !== 4) {
+        return false;
+    }
+    for (var i = 0; i < 4; i++) {
+        var num = parseInt(parts[i], 10);
+        if (isNaN(num) || num < 0 || num > 255) {
+            return false;
+        }
+    }
+    return true;
+}
+
+// Helper function to check if IP is in private network range
+function isPrivateIP(host) {
+    if (!isIP(host)) {
+        return false;
+    }
+    var parts = host.split(".");
+    var first = parseInt(parts[0], 10);
+    var second = parseInt(parts[1], 10);
+    
+    // 10.0.0.0/8
+    if (first === 10) {
+        return true;
+    }
+    // 172.16.0.0/12
+    if (first === 172 && second >= 16 && second <= 31) {
+        return true;
+    }
+    // 192.168.0.0/16
+    if (first === 192 && second === 168) {
+        return true;
+    }
+    // 127.0.0.0/8 (localhost)
+    if (first === 127) {
+        return true;
+    }
+    return false;
+}
+
+function FindProxyForURL(url, host) {
+    // Enable logging (set to false to disable)
+    var enableLog = true;
+    
+    // Log function for debugging using alert
+    function log(message) {
+        if (enableLog) {
+            alert("PAC: " + message);
+        }
+    }
+    
+    log("Checking URL: " + url + ", Host: " + host);
+    
+    // Direct connect addresses and domains (whitelist)
+    var direct_list = [
+        "localhost",
+        "*.cn", // All .cn domains direct connect (use with caution)
+        "*.baidu.com",
+        "*.qq.com",
+        "*.taobao.com"
+    ];
+
+    // Proxy addresses and domains (proxy list)
+    var proxy_list = [
+        "google.com",
+        "*.google.com",
+        "*.youtube.com",
+        "*.facebook.com",
+        "*.twitter.com"
+    ];
+
+    // 1. Check if host is localhost or private IP, then direct connect
+    if (host === "localhost" || host === "127.0.0.1" || isPrivateIP(host)) {
+        log("Matched private/localhost IP: " + host + " -> DIRECT");
+        return "DIRECT";
+    }
+
+    // 2. Check if host is in direct list (whitelist), then direct connect
+    for (var i = 0; i < direct_list.length; i++) {
+        if (shExpMatch(host, direct_list[i])) {
+            log("Matched direct list pattern: " + direct_list[i] + " for " + host + " -> DIRECT");
+            return "DIRECT";
+        }
+    }
+
+    // 3. Check if host is in proxy list, then use proxy
+    for (var i = 0; i < proxy_list.length; i++) {
+        if (shExpMatch(host, proxy_list[i])) {
+            log("Matched proxy list pattern: " + proxy_list[i] + " for " + host + " -> PROXY");
+            return "SOCKS5 127.0.0.1:1088"; // This port should match your sslocal listening port
+        }
+    }
+
+    // 4. Default rule: all other traffic direct connect
+    log("No match found for " + host + " -> DIRECT (default)");
+    return "DIRECT";
+}