Initial repository setup and core files added

Add configuration, documentation, code of conduct, contributing guide, license, and README files. Set up .gitignore, coverage config, GitHub issue templates, pull request template, and initial source code, scripts, and tests for DeepLX optimized for Cloudflare Workers.

src/lib/proxyManager.ts

@@ -0,0 +1,85 @@
+/**
+ * IP rotation and proxy management for DeepLX
+ * Handles proxy selection, browser fingerprinting, and request routing
+ */
+
+/**
+ * Collection of realistic browser user agents for fingerprinting
+ */
+const USER_AGENTS = [
+  "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
+  "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
+  "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
+  "Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0",
+  "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:121.0) Gecko/20100101 Firefox/121.0",
+];
+
+/**
+ * Collection of realistic accept-language headers for regional diversity
+ */
+const ACCEPT_LANGUAGES = [
+  "en-US,en;q=0.9",
+  "en-GB,en;q=0.9",
+  "en-US,en;q=0.8,es;q=0.6",
+  "en-US,en;q=0.9,fr;q=0.8",
+  "en-US,en;q=0.9,de;q=0.8",
+];
+
+/**
+ * Get available proxy endpoints from environment configuration
+ * Parses and validates proxy URLs from environment variables
+ * @param env Environment bindings containing proxy configuration
+ * @returns Promise<ProxyEndpoint[]> - Array of available proxy endpoints
+ */
+export async function getProxyEndpoints(env: Env): Promise<ProxyEndpoint[]> {
+  // Get proxy URLs from environment variables
+  const proxyUrls = env.PROXY_URLS
+    ? env.PROXY_URLS.split(",").map((url) => url.trim())
+    : [];
+
+  // Return validated proxy endpoints
+  return proxyUrls.map((url) => ({
+    url,
+  }));
+}
+
+/**
+ * Select a random proxy from available endpoints
+ * Implements random selection for load distribution
+ * @param env Environment bindings containing proxy configuration
+ * @returns Promise<ProxyEndpoint | null> - Selected proxy or null if none available
+ */
+export async function selectProxy(env: Env): Promise<ProxyEndpoint | null> {
+  try {
+    const proxies = await getProxyEndpoints(env);
+
+    if (proxies.length === 0) {
+      return null;
+    }
+
+    // Random selection for load balancing
+    const index = Math.floor(Math.random() * proxies.length);
+    return proxies[index];
+  } catch (error) {
+    console.error("Failed to select proxy:", error);
+    return null;
+  }
+}
+
+/**
+ * Generate realistic browser fingerprint headers
+ * Creates randomized headers to mimic real browser requests
+ * @returns Record<string, string> - Object containing HTTP headers
+ */
+export function generateBrowserFingerprint(): Record<string, string> {
+  return {
+    "User-Agent": USER_AGENTS[Math.floor(Math.random() * USER_AGENTS.length)],
+    "Accept-Language":
+      ACCEPT_LANGUAGES[Math.floor(Math.random() * ACCEPT_LANGUAGES.length)],
+    Accept: "application/json, text/plain, */*",
+    "Accept-Encoding": "gzip, deflate, br",
+    DNT: "1",
+    Connection: "keep-alive",
+    "Upgrade-Insecure-Requests": "1",
+  };
+}