fix(ai-review 使用量): 修正額度查詢 hostname 精確比對與 total token 為 0 的邊界

app/usage.js

@@ -23,7 +23,7 @@ export function extractUsage(data) {
   if (u && typeof u === 'object') {
     const prompt = num(u.prompt_tokens ?? u.input_tokens);
     const completion = num(u.completion_tokens ?? u.output_tokens);
-    const total = num(u.total_tokens) || prompt + completion;
+    const total = u.total_tokens != null ? num(u.total_tokens) : prompt + completion;
     if (prompt || completion || total) return { promptTokens: prompt, completionTokens: completion, totalTokens: total };
   }
 
@@ -32,7 +32,7 @@ export function extractUsage(data) {
   if (g && typeof g === 'object') {
     const prompt = num(g.promptTokenCount);
     const completion = num(g.candidatesTokenCount);
-    const total = num(g.totalTokenCount) || prompt + completion;
+    const total = g.totalTokenCount != null ? num(g.totalTokenCount) : prompt + completion;
     if (prompt || completion || total) return { promptTokens: prompt, completionTokens: completion, totalTokens: total };
   }
 
@@ -48,7 +48,7 @@ export function extractUsage(data) {
   if (t && typeof t === 'object') {
     const prompt = num(t.input ?? t.prompt);
     const completion = num(t.output ?? t.completion);
-    const total = num(t.total) || prompt + completion;
+    const total = t.total != null ? num(t.total) : prompt + completion;
     if (prompt || completion || total) return { promptTokens: prompt, completionTokens: completion, totalTokens: total };
   }
 
@@ -124,6 +124,19 @@ export function resetRateLimit() {
 
 const stripSlash = (s) => String(s || '').replace(/\/$/, '');
 
+/**
+ * 以實際 hostname 精確比對是否為 OpenRouter，避免被偽造的 baseURL
+ * （如 `openrouter.ai.evil.com` 或 `evil.com/openrouter.ai`）矇騙而把 API key 送往惡意主機。
+ */
+function isOpenRouterBaseURL(baseURL) {
+  try {
+    const host = new URL(baseURL).hostname.toLowerCase();
+    return host === 'openrouter.ai' || host.endsWith('.openrouter.ai');
+  } catch {
+    return false;
+  }
+}
+
 /**
  * OpenRouter：以 API key 呼叫 GET /auth/key 取得額度（可靠）。
  * 回傳金額單位為 USD credits。
@@ -147,7 +160,7 @@ async function fetchOpenRouterQuota({ apiKey, baseURL }, get) {
  */
 const QUOTA_STRATEGIES = {
   openai: async (cfg, get) => {
-    if (/openrouter\.ai/i.test(cfg.baseURL || '')) return fetchOpenRouterQuota(cfg, get);
+    if (isOpenRouterBaseURL(cfg.baseURL)) return fetchOpenRouterQuota(cfg, get);
     return { available: false, reason: 'OpenAI 帳號額度需 dashboard session 權限，API key 無法取得' };
   },
   claude: async () => ({ available: false, reason: 'Anthropic 額度需 Admin API 權限，一般 API key 無法取得' }),