Add brave as alternative WebSearchTool

src/tools/WebSearchTool/adapters/index.ts

@@ -6,36 +6,42 @@
 import { isFirstPartyAnthropicBaseUrl } from '../../../utils/model/providers.js'
 import { ApiSearchAdapter } from './apiAdapter.js'
 import { BingSearchAdapter } from './bingAdapter.js'
+import { BraveSearchAdapter } from './braveAdapter.js'
 import type { WebSearchAdapter } from './types.js'
 
-export type { SearchResult, SearchOptions, SearchProgress, WebSearchAdapter } from './types.js'
+export type {
+  SearchResult,
+  SearchOptions,
+  SearchProgress,
+  WebSearchAdapter,
+} from './types.js'
 
 let cachedAdapter: WebSearchAdapter | null = null
+let cachedAdapterKey: 'api' | 'bing' | 'brave' | null = null
 
 export function createAdapter(): WebSearchAdapter {
-	// 直接用 bing 适配器，跳过 API 适配器的选择逻辑
-  return new BingSearchAdapter()
-//   // Adapter is stateless — safe to reuse across calls within a session
-//   if (cachedAdapter) return cachedAdapter
+  const envAdapter = process.env.WEB_SEARCH_ADAPTER
+  const adapterKey =
+    envAdapter === 'api' || envAdapter === 'bing' || envAdapter === 'brave'
+      ? envAdapter
+      : isFirstPartyAnthropicBaseUrl()
+        ? 'api'
+        : 'bing'
 
-//   // Env override: WEB_SEARCH_ADAPTER=api|bing forces specific backend
-//   const envAdapter = process.env.WEB_SEARCH_ADAPTER
-//   if (envAdapter === 'api') {
-//     cachedAdapter = new ApiSearchAdapter()
-//     return cachedAdapter
-//   }
-//   if (envAdapter === 'bing') {
-//     cachedAdapter = new BingSearchAdapter()
-//     return cachedAdapter
-//   }
+  if (cachedAdapter && cachedAdapterKey === adapterKey) return cachedAdapter
 
-//   // Anthropic official URL → API server-side search
-//   if (isFirstPartyAnthropicBaseUrl()) {
-//     cachedAdapter = new ApiSearchAdapter()
-//     return cachedAdapter
-//   }
+  if (adapterKey === 'api') {
+    cachedAdapter = new ApiSearchAdapter()
+    cachedAdapterKey = 'api'
+    return cachedAdapter
+  }
+  if (adapterKey === 'bing') {
+    cachedAdapter = new BingSearchAdapter()
+    cachedAdapterKey = 'bing'
+    return cachedAdapter
+  }
 
-//   // Third-party proxies / non-Anthropic endpoints → Bing fallback
-//   cachedAdapter = new BingSearchAdapter()
-//   return cachedAdapter
+  cachedAdapter = new BraveSearchAdapter()
+  cachedAdapterKey = 'brave'
+  return cachedAdapter
 }