Refactor error handling to config-driven approach with centralized error rules

Made-with: Cursor

open-sse/handlers/ttsCore.js

@@ -339,6 +339,84 @@ export const VOICE_FETCHERS = {
   // openai: uses hardcoded voices from providerModels.js
 };
 
+// ── OpenRouter TTS (via chat completions + audio modality) ───────────────────
+async function handleOpenRouterTts({ model, input, credentials, responseFormat = "mp3" }) {
+  if (!credentials?.apiKey) {
+    return createErrorResult(HTTP_STATUS.UNAUTHORIZED, "No OpenRouter API key configured");
+  }
+
+  // model format: "tts-model/voice" e.g. "openai/gpt-4o-mini-tts/alloy"
+  let ttsModel = "openai/gpt-4o-mini-tts";
+  let voice = "alloy";
+  if (model && model.includes("/")) {
+    const lastSlash = model.lastIndexOf("/");
+    const maybVoice = model.slice(lastSlash + 1);
+    const maybeModel = model.slice(0, lastSlash);
+    // voice names are simple lowercase words, model names contain "/"
+    if (maybeModel.includes("/")) {
+      ttsModel = maybeModel;
+      voice = maybVoice;
+    } else {
+      voice = model;
+    }
+  } else if (model) {
+    voice = model;
+  }
+
+  const res = await fetch("https://openrouter.ai/api/v1/chat/completions", {
+    method: "POST",
+    headers: {
+      "Content-Type": "application/json",
+      "Authorization": `Bearer ${credentials.apiKey}`,
+      "HTTP-Referer": "https://endpoint-proxy.local",
+      "X-Title": "Endpoint Proxy",
+    },
+    body: JSON.stringify({
+      model: ttsModel,
+      modalities: ["text", "audio"],
+      audio: { voice, format: "wav" },
+      stream: true,
+      messages: [{ role: "user", content: input }],
+    }),
+  });
+
+  if (!res.ok) {
+    const err = await res.json().catch(() => ({}));
+    return createErrorResult(res.status, err?.error?.message || `OpenRouter TTS failed: ${res.status}`);
+  }
+
+  // Parse SSE stream, accumulate base64 audio chunks
+  const chunks = [];
+  const reader = res.body.getReader();
+  const decoder = new TextDecoder();
+  let buffer = "";
+
+  while (true) {
+    const { done, value } = await reader.read();
+    if (done) break;
+    buffer += decoder.decode(value, { stream: true });
+
+    const lines = buffer.split("\n");
+    buffer = lines.pop();
+
+    for (const line of lines) {
+      if (!line.startsWith("data: ") || line === "data: [DONE]") continue;
+      try {
+        const json = JSON.parse(line.slice(6));
+        const audioData = json.choices?.[0]?.delta?.audio?.data;
+        if (audioData) chunks.push(audioData);
+      } catch {}
+    }
+  }
+
+  if (chunks.length === 0) {
+    return createErrorResult(HTTP_STATUS.BAD_GATEWAY, "OpenRouter TTS returned no audio data");
+  }
+
+  const base64Audio = chunks.join("");
+  return createTtsResponse(base64Audio, "wav", responseFormat);
+}
+
 // ── OpenAI TTS ───────────────────────────────────────────────────────────────
 async function handleOpenAiTts({ model, input, credentials, responseFormat = "mp3" }) {
   if (!credentials?.apiKey) {
@@ -422,6 +500,12 @@ const TTS_PROVIDERS = {
     },
     requiresCredentials: true,
   },
+  "openrouter": {
+    synthesize: async (text, model, credentials, responseFormat) => {
+      return await handleOpenRouterTts({ model, input: text, credentials, responseFormat });
+    },
+    requiresCredentials: true,
+  },
 };
 
 // ── Core handler ───────────────────────────────────────────────