chore: import upstream snapshot with attribution

open-sse/utils/networkProxy.ts

@@ -0,0 +1,75 @@
+/**
+ * Network Proxy Resolver
+ *
+ * Resolves the outbound proxy URL for a given provider.
+ * Precedence: provider-specific > global > environment variables
+ *
+ * Usage:
+ *   import { resolveProxy } from "open-sse/utils/networkProxy.js";
+ *   const proxyUrl = await resolveProxy("openai");
+ */
+
+let _cachedConfig = null;
+let _cacheExpiry = 0;
+
+/**
+ * Get proxy config from localDb (with caching)
+ */
+async function getConfig() {
+  const now = Date.now();
+  if (_cachedConfig && now < _cacheExpiry) return _cachedConfig;
+
+  try {
+    const { getProxyConfig } = await import("../../src/lib/localDb");
+    _cachedConfig = await getProxyConfig();
+    _cacheExpiry = now + 30_000; // Cache for 30s
+    return _cachedConfig;
+  } catch {
+    return { global: null, providers: {} };
+  }
+}
+
+/**
+ * Resolve proxy URL for a given provider
+ * @param {string} providerId - Provider ID (e.g., "openai", "anthropic")
+ * @returns {string|null} Proxy URL or null if no proxy configured
+ */
+/** @returns {Promise<unknown>} */
+export async function resolveProxy(providerId) {
+  const config = await getConfig();
+
+  // 1. Provider-specific proxy
+  if (providerId && config.providers?.[providerId]) {
+    return config.providers[providerId];
+  }
+
+  // 2. Global proxy
+  if (config.global) {
+    return config.global;
+  }
+
+  // 3. Environment variables
+  const envProxy = process.env.HTTPS_PROXY || process.env.HTTP_PROXY || process.env.ALL_PROXY;
+  if (envProxy) {
+    // Check NO_PROXY
+    const noProxy = process.env.NO_PROXY || process.env.no_proxy || "";
+    // Simple check: if providerId is in NO_PROXY list, skip
+    if (noProxy && providerId) {
+      const noProxyList = noProxy.split(",").map((s) => s.trim().toLowerCase());
+      if (noProxyList.includes(providerId.toLowerCase())) {
+        return null;
+      }
+    }
+    return envProxy;
+  }
+
+  return null;
+}
+
+/**
+ * Invalidate the proxy config cache (call after config changes)
+ */
+export function invalidateProxyCache() {
+  _cachedConfig = null;
+  _cacheExpiry = 0;
+}