feat(http3): add automatic HTTP/3 route augmentation for qualifying HTTPS routes

ts/http3/http3-route-augmentation.ts

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+import type * as plugins from '../plugins.js';
+
+/**
+ * Configuration for HTTP/3 (QUIC) route augmentation.
+ * HTTP/3 is enabled by default on all qualifying HTTPS routes.
+ */
+export interface IHttp3Config {
+  /** Enable HTTP/3 augmentation on qualifying routes (default: true) */
+  enabled?: boolean;
+  /** QUIC-specific settings applied to all augmented routes */
+  quicSettings?: {
+    /** QUIC connection idle timeout in ms (default: 30000) */
+    maxIdleTimeout?: number;
+    /** Max concurrent bidirectional streams per connection (default: 100) */
+    maxConcurrentBidiStreams?: number;
+    /** Max concurrent unidirectional streams per connection (default: 100) */
+    maxConcurrentUniStreams?: number;
+    /** Initial congestion window size in bytes */
+    initialCongestionWindow?: number;
+  };
+  /** Alt-Svc header settings */
+  altSvc?: {
+    /** Port advertised in Alt-Svc header (default: same as listening port) */
+    port?: number;
+    /** Max age for Alt-Svc advertisement in seconds (default: 86400) */
+    maxAge?: number;
+  };
+  /** UDP session settings */
+  udpSettings?: {
+    /** Idle timeout for UDP sessions in ms (default: 60000) */
+    sessionTimeout?: number;
+    /** Max concurrent UDP sessions per source IP (default: 1000) */
+    maxSessionsPerIP?: number;
+    /** Max accepted datagram size in bytes (default: 65535) */
+    maxDatagramSize?: number;
+  };
+}
+
+type TPortRange = plugins.smartproxy.IRouteConfig['match']['ports'];
+
+/**
+ * Check whether a TPortRange includes port 443.
+ */
+function portRangeIncludes443(ports: TPortRange): boolean {
+  if (typeof ports === 'number') return ports === 443;
+  if (Array.isArray(ports)) {
+    return ports.some((p) => {
+      if (typeof p === 'number') return p === 443;
+      return p.from <= 443 && p.to >= 443;
+    });
+  }
+  return false;
+}
+
+/**
+ * Check if a route name indicates an email route that should not get HTTP/3.
+ */
+function isEmailRoute(route: plugins.smartproxy.IRouteConfig): boolean {
+  const name = route.name?.toLowerCase() || '';
+  return (
+    name.startsWith('smtp-') ||
+    name.startsWith('submission-') ||
+    name.startsWith('smtps-') ||
+    name.startsWith('email-')
+  );
+}
+
+/**
+ * Determine if a route qualifies for HTTP/3 augmentation.
+ */
+export function routeQualifiesForHttp3(
+  route: plugins.smartproxy.IRouteConfig,
+  globalConfig: IHttp3Config,
+): boolean {
+  // Check global enable + per-route override
+  const globalEnabled = globalConfig.enabled !== false; // default true
+  const perRouteOverride = route.action.options?.http3;
+
+  // If per-route explicitly set, use that; otherwise use global
+  const shouldAugment =
+    perRouteOverride !== undefined ? perRouteOverride : globalEnabled;
+  if (!shouldAugment) return false;
+
+  // Must be forward type
+  if (route.action.type !== 'forward') return false;
+
+  // Must include port 443
+  if (!portRangeIncludes443(route.match.ports)) return false;
+
+  // Must have TLS
+  if (!route.action.tls) return false;
+
+  // Skip email routes
+  if (isEmailRoute(route)) return false;
+
+  // Skip if already configured with transport 'all' or 'udp'
+  if (route.match.transport === 'all' || route.match.transport === 'udp') return false;
+
+  // Skip if already has QUIC config
+  if (route.action.udp?.quic) return false;
+
+  return true;
+}
+
+/**
+ * Augment a single route with HTTP/3 fields.
+ * Returns a new route object (does not mutate the original).
+ */
+export function augmentRouteWithHttp3(
+  route: plugins.smartproxy.IRouteConfig,
+  config: IHttp3Config,
+): plugins.smartproxy.IRouteConfig {
+  if (!routeQualifiesForHttp3(route, config)) {
+    return route;
+  }
+
+  return {
+    ...route,
+    match: {
+      ...route.match,
+      transport: 'all' as const,
+    },
+    action: {
+      ...route.action,
+      udp: {
+        ...(route.action.udp || {}),
+        sessionTimeout: config.udpSettings?.sessionTimeout,
+        maxSessionsPerIP: config.udpSettings?.maxSessionsPerIP,
+        maxDatagramSize: config.udpSettings?.maxDatagramSize,
+        quic: {
+          enableHttp3: true,
+          maxIdleTimeout: config.quicSettings?.maxIdleTimeout,
+          maxConcurrentBidiStreams: config.quicSettings?.maxConcurrentBidiStreams,
+          maxConcurrentUniStreams: config.quicSettings?.maxConcurrentUniStreams,
+          altSvcPort: config.altSvc?.port,
+          altSvcMaxAge: config.altSvc?.maxAge ?? 86400,
+          initialCongestionWindow: config.quicSettings?.initialCongestionWindow,
+        },
+      },
+    },
+  };
+}
+
+/**
+ * Augment all qualifying routes in an array.
+ * Returns a new array (does not mutate originals).
+ */
+export function augmentRoutesWithHttp3(
+  routes: plugins.smartproxy.IRouteConfig[],
+  config: IHttp3Config,
+): plugins.smartproxy.IRouteConfig[] {
+  return routes.map((route) => augmentRouteWithHttp3(route, config));
+}

ts/http3/index.ts

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+export * from './http3-route-augmentation.js';