action.yaml

@@ -79,6 +79,23 @@ inputs:
     description: 'Amazon Q Base URL'
     required: false
 
+  # OpenCode Server
+  OPENCODE_BASE_URL:
+    description: 'OpenCode server Base URL'
+    required: false
+  OPENCODE_MODEL:
+    description: 'OpenCode model id'
+    required: false
+  OPENCODE_PROVIDER:
+    description: 'OpenCode server provider id'
+    required: false
+  OPENCODE_SERVER_USERNAME:
+    description: 'OpenCode server Basic Auth username'
+    required: false
+  OPENCODE_SERVER_PASSWORD:
+    description: 'OpenCode server Basic Auth password'
+    required: false
+
 runs:
   using: 'docker'
   image: 'Dockerfile'
@@ -107,3 +124,8 @@ runs:
     OLLAMA_MODEL: ${{ inputs.OLLAMA_MODEL }}
     AMAZONQ_API_KEY: ${{ inputs.AMAZONQ_API_KEY }}
     AMAZONQ_BASE_URL: ${{ inputs.AMAZONQ_BASE_URL }}
+    OPENCODE_BASE_URL: ${{ inputs.OPENCODE_BASE_URL }}
+    OPENCODE_MODEL: ${{ inputs.OPENCODE_MODEL }}
+    OPENCODE_PROVIDER: ${{ inputs.OPENCODE_PROVIDER }}
+    OPENCODE_SERVER_USERNAME: ${{ inputs.OPENCODE_SERVER_USERNAME }}
+    OPENCODE_SERVER_PASSWORD: ${{ inputs.OPENCODE_SERVER_PASSWORD }}

app/config.js

@@ -24,6 +24,7 @@ export function getLLMConfig() {
     ['gemini',   splitKeys(process.env.GEMINI_API_KEY),   process.env.GEMINI_BASE_URL || 'https://generativelanguage.googleapis.com/v1beta', process.env.GEMINI_MODEL || 'gemini-2.5-flash'],
     ['ollama',   ['ollama'],                               process.env.OLLAMA_BASE_URL,  process.env.OLLAMA_MODEL],
     ['amazonq',  splitKeys(process.env.AMAZONQ_API_KEY),  process.env.AMAZONQ_BASE_URL  || 'https://q.api.aws',              process.env.AMAZONQ_MODEL  || 'amazon-q'],
+    ['opencode', ['opencode'], process.env.OPENCODE_BASE_URL, process.env.OPENCODE_MODEL || 'gemini-2.5-flash'],
   ];
   for (const [provider, apiKeys, baseURL, model] of checks) {
     if (apiKeys.length > 0 && baseURL) return { provider, apiKeys, baseURL, model };

app/llm.js

@@ -2,6 +2,81 @@ import axios from 'axios';
 import { getLLMConfig } from './config.js';
 import { line, error } from './log.js';
 
+function isOpenAIGpt55(provider, model) {
+  return provider === 'openai' && /^gpt-5\.5(?:-|$)/i.test(model || '');
+}
+
+function chatEndpoint(baseURL, provider, model) {
+  const base = baseURL.replace(/\/$/, '');
+  return isOpenAIGpt55(provider, model) ? `${base}/responses` : `${base}/chat/completions`;
+}
+
+function chatPayload(provider, model, systemPrompt, userContent) {
+  if (isOpenAIGpt55(provider, model)) {
+    return { model, instructions: systemPrompt, input: userContent, temperature: 0.2 };
+  }
+  return { model, messages: [{ role: 'system', content: systemPrompt }, { role: 'user', content: userContent }], temperature: 0.2 };
+}
+
+function extractContent(provider, model, data) {
+  if (!isOpenAIGpt55(provider, model)) return data.choices[0].message.content;
+  if (typeof data.output_text === 'string') return data.output_text;
+  const parts = data.output?.flatMap(item => item.content || []) || [];
+  const text = parts
+    .map(part => {
+      if (typeof part.text === 'string') return part.text;
+      if (typeof part.content === 'string') return part.content;
+      return '';
+    })
+    .filter(Boolean)
+    .join('');
+  if (text) return text;
+  return data.choices?.[0]?.message?.content || '';
+}
+
+function opencodeModelConfig(model) {
+  const [providerID, modelID] = model.includes('/') ? model.split('/', 2) : [process.env.OPENCODE_PROVIDER || 'google', model];
+  return { providerID, modelID };
+}
+
+function applyOpenCodeAuth(headers) {
+  const password = process.env.OPENCODE_SERVER_PASSWORD;
+  if (!password) return;
+  const username = process.env.OPENCODE_SERVER_USERNAME || 'opencode';
+  headers['Authorization'] = `Basic ${Buffer.from(`${username}:${password}`).toString('base64')}`;
+}
+
+function extractOpenCodeContent(data) {
+  const parts = data.parts || data.data?.parts || data.info?.content || data.data?.info?.content || [];
+  return parts
+    .map(part => part.text || part.content || '')
+    .filter(Boolean)
+    .join('');
+}
+
+async function chatOpenCode(baseURL, model, systemPrompt, userContent, headers) {
+  const base = baseURL.replace(/\/$/, '');
+  const { providerID, modelID } = opencodeModelConfig(model);
+  const session = await axios.post(
+    `${base}/session`,
+    { title: 'AI Code Review', model: { providerID, id: modelID } },
+    { headers }
+  );
+  const sessionID = session.data.id || session.data.data?.id;
+  if (!sessionID) throw new Error('OpenCode session 建立失敗：回應中沒有 session id');
+
+  const resp = await axios.post(
+    `${base}/session/${sessionID}/message`,
+    {
+      model: { providerID, modelID },
+      system: systemPrompt,
+      parts: [{ type: 'text', text: userContent }],
+    },
+    { headers }
+  );
+  return extractOpenCodeContent(resp.data);
+}
+
 export async function chat(systemPrompt, userContent) {
   const { provider, apiKeys, baseURL, model } = getLLMConfig();
   if (!provider) throw new Error('未設定任何 LLM API Key');
@@ -13,14 +88,18 @@ export async function chat(systemPrompt, userContent) {
 
   const shuffled = [...apiKeys].sort(() => Math.random() - 0.5);
   for (let i = 0; i < shuffled.length; i++) {
-    if (provider !== 'ollama') headers['Authorization'] = `Bearer ${shuffled[i]}`;
+    if (provider !== 'ollama' && provider !== 'opencode') headers['Authorization'] = `Bearer ${shuffled[i]}`;
     try {
+      if (provider === 'opencode') {
+        applyOpenCodeAuth(headers);
+        return await chatOpenCode(baseURL, model, systemPrompt, userContent, headers);
+      }
       const resp = await axios.post(
-        `${baseURL.replace(/\/$/, '')}/chat/completions`,
-        { model, messages: [{ role: 'system', content: systemPrompt }, { role: 'user', content: userContent }], temperature: 0.2 },
+        chatEndpoint(baseURL, provider, model),
+        chatPayload(provider, model, systemPrompt, userContent),
         { headers }
       );
-      return resp.data.choices[0].message.content;
+      return extractContent(provider, model, resp.data);
     } catch (e) {
       line(`[LLM] key[${i + 1}/${shuffled.length}] 失敗: ${e.message}`);
     }

app/preflight.js

@@ -15,6 +15,17 @@ import { step, line, ok, error } from './log.js';
 const httpsAgent = GITEA_SKIP_TLS_VERIFY ? new https.Agent({ rejectUnauthorized: false }) : undefined;
 const api = (path) => `${GITEA_SERVER_URL.replace(/\/$/, '')}/api/v1${path}`;
 const giteaHeaders = (token) => ({ Authorization: `token ${token}`, 'Content-Type': 'application/json' });
+const usesResponsesApi = (provider, model) => provider === 'openai' && /^gpt-5\.5(?:-|$)/i.test(model || '');
+const opencodeModelConfig = (model) => {
+  const [providerID, modelID] = model.includes('/') ? model.split('/', 2) : [process.env.OPENCODE_PROVIDER || 'google', model];
+  return { providerID, modelID };
+};
+const applyOpenCodeAuth = (headers) => {
+  const password = process.env.OPENCODE_SERVER_PASSWORD;
+  if (!password) return;
+  const username = process.env.OPENCODE_SERVER_USERNAME || 'opencode';
+  headers['Authorization'] = `Basic ${Buffer.from(`${username}:${password}`).toString('base64')}`;
+};
 
 function giteaErr(e) {
   const status = e.response?.status;
@@ -63,6 +74,7 @@ export async function verifyLLM() {
   if (!baseURL) return { ok: false, provider, error: `${provider} 缺少 base URL` };
 
   const base = baseURL.replace(/\/$/, '');
+  const headers = { 'Content-Type': 'application/json' };
 
   if (provider === 'ollama') {
     try {
@@ -73,14 +85,31 @@ export async function verifyLLM() {
     }
   }
 
-  const headers = { 'Content-Type': 'application/json' };
+  if (provider === 'opencode') {
+    const { providerID, modelID } = opencodeModelConfig(model);
+    applyOpenCodeAuth(headers);
+    try {
+      await axios.get(`${base}/global/health`, { headers, timeout: 30000 });
+      const providers = await axios.get(`${base}/config/providers`, { headers, timeout: 30000 });
+      const configuredProvider = providers.data.providers?.find(p => p.id === providerID);
+      if (!configuredProvider) return { ok: false, provider, error: `OpenCode server 未設定 provider=${providerID}` };
+      if (!configuredProvider.models?.[modelID]) return { ok: false, provider, error: `OpenCode server provider=${providerID} 未列出 model=${modelID}` };
+      return { ok: true, provider };
+    } catch (e) {
+      return { ok: false, provider, error: `OpenCode server 驗證失敗: ${e.message}` };
+    }
+  }
+
   if (provider === 'claude') headers['anthropic-version'] = '2023-06-01';
-  const payload = { model, messages: [{ role: 'user', content: 'ping' }], max_tokens: 1, temperature: 0 };
+  const endpoint = usesResponsesApi(provider, model) ? `${base}/responses` : `${base}/chat/completions`;
+  const payload = usesResponsesApi(provider, model)
+    ? { model, input: 'ping', max_output_tokens: 1, temperature: 0 }
+    : { model, messages: [{ role: 'user', content: 'ping' }], max_tokens: 1, temperature: 0 };
 
   for (let i = 0; i < apiKeys.length; i++) {
     headers['Authorization'] = `Bearer ${apiKeys[i]}`;
     try {
-      await axios.post(`${base}/chat/completions`, payload, { headers, timeout: 30000 });
+      await axios.post(endpoint, payload, { headers, timeout: 30000 });
       return { ok: true, provider, keyIndex: i + 1, total: apiKeys.length };
     } catch (e) {
       line(`[preflight] LLM key[${i + 1}/${apiKeys.length}] 驗證失敗: ${e.message}`);