| import { getOpenCodeApiKey, getOpenCodeModelName } from '../../utils/auth.js' |
| import { |
| convertAnthropicToolsToOpenAI, |
| convertOpenAIStreamToAnthropic, |
| type AnthropicMessage, |
| type AnthropicContentBlock, |
| } from './copilotClient.js' |
|
|
| const OPENCODE_BASE_URL = 'https://opencode.ai/zen/v1' |
|
|
| |
| const FREE_MODEL_IDS = new Set([ |
| 'big-pickle', |
| 'gpt-5-nano', |
| ]) |
|
|
| let cachedModels: Array<{ id: string; name?: string; isFree: boolean }> | null = null |
| let fetchPromise: Promise<void> | null = null |
|
|
| export async function fetchOpencodeModels(): Promise<void> { |
| if (fetchPromise) return |
| |
| fetchPromise = (async () => { |
| try { |
| const apiKey = getOpenCodeApiKey() |
| const headers: Record<string, string> = { |
| 'User-Agent': 'claude-code/2.1.88', |
| } |
| if (apiKey) { |
| headers.Authorization = `Bearer ${apiKey}` |
| } |
|
|
| const res = await fetch(`${OPENCODE_BASE_URL}/models`, { headers }) |
| if (!res.ok) return |
|
|
| const data = await res.json() as { data?: Array<{ id: string; name?: string }> } |
| if (Array.isArray(data.data)) { |
| cachedModels = data.data.map(m => ({ |
| id: m.id, |
| name: m.name || m.id, |
| isFree: m.id.endsWith('-free') || FREE_MODEL_IDS.has(m.id), |
| })) |
| } |
| } catch { |
| |
| } finally { |
| fetchPromise = null |
| } |
| })() |
| |
| await fetchPromise |
| } |
|
|
| export function getCachedOpencodeModels(): Array<{ id: string; name?: string; isFree: boolean }> { |
| return cachedModels || [] |
| } |
|
|
| type OpenAIMessage = { |
| role: 'system' | 'user' | 'assistant' | 'tool' |
| content: string | Array<{ type: string; text?: string; image_url?: { url: string } }> | null |
| tool_calls?: Array<{ |
| id: string |
| type: 'function' |
| function: { name: string; arguments: string } |
| }> |
| tool_call_id?: string |
| reasoning_content?: string |
| } |
|
|
| function convertAnthropicMessagesToOpenAI( |
| messages: AnthropicMessage[], |
| systemPrompt?: string, |
| ): OpenAIMessage[] { |
| const result: OpenAIMessage[] = [] |
|
|
| if (systemPrompt) { |
| result.push({ role: 'system', content: systemPrompt }) |
| } |
|
|
| for (const msg of messages) { |
| if (typeof msg.content === 'string') { |
| result.push({ role: msg.role, content: msg.content }) |
| continue |
| } |
|
|
| if (msg.role === 'user') { |
| const parts: Array<{ type: string; text?: string; image_url?: { url: string } }> = [] |
| const toolResults: OpenAIMessage[] = [] |
|
|
| for (const block of msg.content) { |
| if (block.type === 'text') { |
| parts.push({ type: 'text', text: (block as { type: 'text'; text: string }).text }) |
| } else if (block.type === 'image') { |
| const imgBlock = block as { type: 'image'; source: { type: 'base64'; media_type: string; data: string } } |
| parts.push({ |
| type: 'image_url', |
| image_url: { url: `data:${imgBlock.source.media_type};base64,${imgBlock.source.data}` }, |
| }) |
| } else if (block.type === 'tool_result') { |
| const trBlock = block as { type: 'tool_result'; tool_use_id: string; content: string | Array<{ type: string; text?: string }> } |
| let content = '' |
| if (typeof trBlock.content === 'string') { |
| content = trBlock.content |
| } else if (Array.isArray(trBlock.content)) { |
| content = trBlock.content |
| .filter(c => c.type === 'text') |
| .map(c => c.text || '') |
| .join('\n') |
| } |
| toolResults.push({ |
| role: 'tool', |
| content, |
| tool_call_id: trBlock.tool_use_id, |
| }) |
| } |
| } |
|
|
| if (toolResults.length > 0) { |
| result.push(...toolResults) |
| if (parts.length > 0) { |
| result.push({ role: 'user', content: parts.length === 1 && parts[0].type === 'text' ? parts[0].text! : parts }) |
| } |
| } else if (parts.length > 0) { |
| result.push({ role: 'user', content: parts.length === 1 && parts[0].type === 'text' ? parts[0].text! : parts }) |
| } |
| } else if (msg.role === 'assistant') { |
| const textParts: string[] = [] |
| const toolCalls: Array<{ id: string; type: 'function'; function: { name: string; arguments: string } }> = [] |
| let reasoningContent: string | undefined |
|
|
| for (const block of msg.content) { |
| if (block.type === 'text') { |
| textParts.push((block as { type: 'text'; text: string }).text) |
| } else if (block.type === 'tool_use') { |
| const tuBlock = block as { type: 'tool_use'; id: string; name: string; input: Record<string, unknown> } |
| toolCalls.push({ |
| id: tuBlock.id, |
| type: 'function', |
| function: { |
| name: tuBlock.name, |
| arguments: JSON.stringify(tuBlock.input), |
| }, |
| }) |
| } else if (block.type === 'thinking') { |
| const thinkingBlock = block as { type: 'thinking'; thinking: string } |
| reasoningContent = thinkingBlock.thinking |
| } |
| } |
|
|
| const assistantMsg: OpenAIMessage = { |
| role: 'assistant', |
| content: textParts.join('\n') || null, |
| } |
| if (reasoningContent) { |
| assistantMsg.reasoning_content = reasoningContent |
| } |
| if (toolCalls.length > 0) { |
| assistantMsg.tool_calls = toolCalls |
| } |
| result.push(assistantMsg) |
| } |
| } |
|
|
| return result |
| } |
|
|
| function normalizeBaseUrl(url: string): string { |
| return url.replace(/\/$/, '') |
| } |
|
|
| function chatCompletionsUrl(base: string): string { |
| const b = normalizeBaseUrl(base) |
| if (b.endsWith('/v1')) { |
| return `${b}/chat/completions` |
| } |
| return `${b}/v1/chat/completions` |
| } |
|
|
| export function createOpenCodeFetchOverride( |
| model: string, |
| ): (input: RequestInfo | URL, init?: RequestInit) => Promise<Response> { |
| const apiKey = getOpenCodeApiKey() || '' |
| const modelName = getOpenCodeModelName() || model || 'big-pickle' |
| const endpoint = chatCompletionsUrl(apiKey ? OPENCODE_BASE_URL : OPENCODE_BASE_URL) |
|
|
| return async (input: RequestInfo | URL, init?: RequestInit): Promise<Response> => { |
| const url = input instanceof URL ? input.href : typeof input === 'string' ? input : input.url |
|
|
| if (!url.includes('/messages') && !url.includes('/v1/')) { |
| return fetch(input, init) |
| } |
|
|
| if (url.includes('/count_tokens') || url.includes('/models')) { |
| return new Response(JSON.stringify({ input_tokens: 0 }), { |
| status: 200, |
| headers: { 'Content-Type': 'application/json' }, |
| }) |
| } |
|
|
| let anthropicBody: Record<string, unknown> = {} |
| if (init?.body) { |
| try { |
| anthropicBody = JSON.parse( |
| typeof init.body === 'string' ? init.body : new TextDecoder().decode(init.body as ArrayBuffer), |
| ) |
| } catch { |
| return fetch(input, init) |
| } |
| } |
|
|
| const systemBlocks = anthropicBody.system as |
| | Array<{ type: string; text: string }> |
| | string |
| | undefined |
| let systemPrompt = '' |
| if (typeof systemBlocks === 'string') { |
| systemPrompt = systemBlocks |
| } else if (Array.isArray(systemBlocks)) { |
| systemPrompt = systemBlocks |
| .filter(b => b.type === 'text') |
| .map(b => b.text) |
| .join('\n\n') |
| } |
|
|
| const anthropicMessages = (anthropicBody.messages || []) as AnthropicMessage[] |
| const openaiMessages = convertAnthropicMessagesToOpenAI(anthropicMessages, systemPrompt) |
|
|
| const anthropicTools = (anthropicBody.tools || []) as Array<{ |
| name: string |
| description?: string |
| input_schema?: Record<string, unknown> |
| }> |
| const openaiTools = anthropicTools.length > 0 ? convertAnthropicToolsToOpenAI(anthropicTools) : undefined |
|
|
| const isStreaming = anthropicBody.stream === true |
|
|
| const requestBody: Record<string, unknown> = { |
| model: modelName, |
| messages: openaiMessages, |
| stream: isStreaming, |
| } |
|
|
| if (anthropicBody.max_tokens) { |
| requestBody.max_tokens = anthropicBody.max_tokens |
| } |
|
|
| if (openaiTools && openaiTools.length > 0) { |
| requestBody.tools = openaiTools |
| requestBody.tool_choice = 'auto' |
| } |
|
|
| const headers: Record<string, string> = { |
| 'Content-Type': 'application/json', |
| 'User-Agent': 'claude-code/2.1.88', |
| } |
| if (apiKey) { |
| headers.Authorization = `Bearer ${apiKey}` |
| } |
|
|
| const openaiResponse = await fetch(endpoint, { |
| method: 'POST', |
| headers, |
| body: JSON.stringify(requestBody), |
| signal: init?.signal, |
| }) |
|
|
| if (!openaiResponse.ok) { |
| return openaiResponse |
| } |
|
|
| if (!isStreaming) { |
| const data = (await openaiResponse.json()) as { |
| id: string |
| choices: Array<{ |
| message: { |
| role: string |
| content: string | null |
| reasoning_content?: string |
| tool_calls?: Array<{ |
| id: string |
| function: { name: string; arguments: string } |
| }> |
| } |
| finish_reason: string |
| }> |
| usage?: { prompt_tokens: number; completion_tokens: number } |
| } |
|
|
| const choice = data.choices[0] |
| const anthropicContent: Array<{ |
| type: string |
| text?: string |
| id?: string |
| name?: string |
| input?: unknown |
| }> = [] |
|
|
| if (choice?.message?.reasoning_content) { |
| anthropicContent.push({ type: 'thinking', thinking: choice.message.reasoning_content }) |
| } |
|
|
| if (choice?.message?.content) { |
| anthropicContent.push({ type: 'text', text: choice.message.content }) |
| } |
|
|
| if (choice?.message?.tool_calls) { |
| for (const tc of choice.message.tool_calls) { |
| anthropicContent.push({ |
| type: 'tool_use', |
| id: tc.id, |
| name: tc.function.name, |
| input: JSON.parse(tc.function.arguments || '{}'), |
| }) |
| } |
| } |
|
|
| const anthropicResponse = { |
| id: data.id || `msg_opencode_${Date.now()}`, |
| type: 'message', |
| role: 'assistant', |
| content: anthropicContent, |
| model: modelName, |
| stop_reason: choice?.finish_reason === 'tool_calls' ? 'tool_use' : 'end_turn', |
| usage: { |
| input_tokens: data.usage?.prompt_tokens || 0, |
| output_tokens: data.usage?.completion_tokens || 0, |
| }, |
| } |
|
|
| return new Response(JSON.stringify(anthropicResponse), { |
| status: 200, |
| headers: { 'Content-Type': 'application/json' }, |
| }) |
| } |
|
|
| if (!openaiResponse.body) { |
| return openaiResponse |
| } |
|
|
| const transformStream = convertOpenAIStreamToAnthropicWithReasoning(openaiResponse.body, modelName) |
|
|
| return new Response(transformStream, { |
| status: 200, |
| headers: { |
| 'Content-Type': 'text/event-stream', |
| 'Cache-Control': 'no-cache', |
| Connection: 'keep-alive', |
| }, |
| }) |
| } |
| } |
|
|
| function convertOpenAIStreamToAnthropicWithReasoning( |
| openaiStream: ReadableStream, |
| model: string, |
| ): ReadableStream<Uint8Array> { |
| const encoder = new TextEncoder() |
| const decoder = new TextDecoder() |
|
|
| let messageId = `msg_${Date.now()}` |
| let contentIndex = 0 |
| let hasStartedContent = false |
| let hasReasoningBlock = false |
| let currentToolCallIndex = -1 |
| const toolCalls: Map<number, { id: string; name: string; arguments: string }> = new Map() |
| let totalOutputTokens = 0 |
|
|
| return new ReadableStream({ |
| async start(controller) { |
| const reader = openaiStream.getReader() |
| let buffer = '' |
|
|
| try { |
| while (true) { |
| const { done, value } = await reader.read() |
| if (done) break |
|
|
| buffer += decoder.decode(value, { stream: true }) |
|
|
| const lines = buffer.split('\n') |
| buffer = lines.pop() || '' |
|
|
| for (const line of lines) { |
| if (!line.startsWith('data: ')) continue |
| const data = line.slice(6).trim() |
| if (data === '[DONE]') { |
| if (hasStartedContent) { |
| controller.enqueue(encoder.encode(`event: content_block_stop\ndata: {"index":${contentIndex - 1}}\n\n`)) |
| } |
| for (const [idx, tc] of toolCalls) { |
| controller.enqueue( |
| encoder.encode(`event: content_block_stop\ndata: {"index":${contentIndex + idx}}\n\n`), |
| ) |
| } |
| controller.enqueue( |
| encoder.encode( |
| `event: message_delta\ndata: {"delta":{"stop_reason":"${toolCalls.size > 0 ? 'tool_use' : 'end_turn'}"},"usage":{"output_tokens":${totalOutputTokens}}}\n\n`, |
| ), |
| ) |
| controller.enqueue(encoder.encode('event: message_stop\ndata: {}\n\n')) |
| return |
| } |
|
|
| let chunk: { |
| choices?: Array<{ |
| delta?: { |
| content?: string | null |
| reasoning_content?: string | null |
| tool_calls?: Array<{ |
| index: number |
| id?: string |
| function?: { name?: string; arguments?: string } |
| }> |
| role?: string |
| } |
| finish_reason?: string | null |
| }> |
| usage?: { completion_tokens?: number; prompt_tokens?: number; total_tokens?: number } |
| } |
|
|
| try { |
| chunk = JSON.parse(data) |
| } catch { |
| continue |
| } |
|
|
| if (chunk.usage?.completion_tokens) { |
| totalOutputTokens = chunk.usage.completion_tokens |
| } |
|
|
| const choice = chunk.choices?.[0] |
| if (!choice?.delta) continue |
|
|
| const delta = choice.delta |
|
|
| if (delta.reasoning_content != null && delta.reasoning_content !== '') { |
| if (!hasReasoningBlock) { |
| hasReasoningBlock = true |
| controller.enqueue( |
| encoder.encode( |
| `event: content_block_start\ndata: {"index":${contentIndex},"content_block":{"type":"thinking","thinking":""}}\n\n`, |
| ), |
| ) |
| } |
| controller.enqueue( |
| encoder.encode( |
| `event: content_block_delta\ndata: {"index":${contentIndex},"delta":{"type":"thinking_delta","thinking":"${JSON.stringify(delta.reasoning_content).slice(1, -1)}"}}\n\n`, |
| ), |
| ) |
| } |
|
|
| if (delta.content != null && delta.content !== '') { |
| if (!hasStartedContent) { |
| hasStartedContent = true |
| if (hasReasoningBlock) { |
| controller.enqueue( |
| encoder.encode(`event: content_block_stop\ndata: {"index":${contentIndex}}\n\n`), |
| ) |
| contentIndex++ |
| } |
| controller.enqueue( |
| encoder.encode( |
| `event: content_block_start\ndata: {"index":${contentIndex},"content_block":{"type":"text","text":""}}\n\n`, |
| ), |
| ) |
| } |
| controller.enqueue( |
| encoder.encode( |
| `event: content_block_delta\ndata: {"index":${contentIndex},"delta":{"type":"text_delta","text":"${JSON.stringify(delta.content).slice(1, -1)}"}}\n\n`, |
| ), |
| ) |
| } |
|
|
| if (delta.tool_calls) { |
| for (const tc of delta.tool_calls) { |
| if (tc.id) { |
| if (hasStartedContent && currentToolCallIndex === -1) { |
| controller.enqueue( |
| encoder.encode(`event: content_block_stop\ndata: {"index":${contentIndex}}\n\n`), |
| ) |
| contentIndex++ |
| hasStartedContent = false |
| } |
| currentToolCallIndex = tc.index |
| toolCalls.set(tc.index, { |
| id: tc.id, |
| name: tc.function?.name || '', |
| arguments: tc.function?.arguments || '', |
| }) |
| const toolBlockIndex = |
| hasStartedContent ? contentIndex + 1 + tc.index : contentIndex + tc.index |
| controller.enqueue( |
| encoder.encode( |
| `event: content_block_start\ndata: {"index":${toolBlockIndex},"content_block":{"type":"text","text":""}}\n\n`, |
| ), |
| ) |
| } else if (tc.function?.arguments) { |
| const existing = toolCalls.get(tc.index) |
| if (existing) { |
| existing.arguments += tc.function.arguments |
| } |
| } |
| } |
| } |
|
|
| if (choice.finish_reason) { |
| if (hasStartedContent) { |
| controller.enqueue( |
| encoder.encode(`event: content_block_stop\ndata: {"index":${contentIndex}}\n\n`), |
| ) |
| } |
| controller.enqueue( |
| encoder.encode( |
| `event: message_delta\ndata: {"delta":{"stop_reason":"${choice.finish_reason === 'tool_calls' ? 'tool_use' : 'end_turn'}"},"usage":{"output_tokens":${totalOutputTokens}}}\n\n`, |
| ), |
| ) |
| controller.enqueue(encoder.encode('event: message_stop\ndata: {}\n\n')) |
| return |
| } |
| } |
| } |
| } finally { |
| reader.releaseLock() |
| controller.close() |
| } |
| }, |
| }) |
| } |
|
|
