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worker.js
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worker.js
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const MODELS = {
"claude-3-opus": {
vertexName: "claude-3-opus@20240229",
region: "us-east5",
},
"claude-3-sonnet": {
vertexName: "claude-3-sonnet@20240229",
region: "us-central1",
},
"claude-3-haiku": {
vertexName: "claude-3-haiku@20240307",
region: "us-central1",
},
"claude-3-5-sonnet": {
vertexName: "claude-3-5-sonnet@20240620",
region: "us-east5",
},
"claude-3-opus-20240229": {
vertexName: "claude-3-opus@20240229",
region: "us-east5",
},
"claude-3-sonnet-20240229": {
vertexName: "claude-3-sonnet@20240229",
region: "us-central1",
},
"claude-3-haiku-20240307": {
vertexName: "claude-3-haiku@20240307",
region: "us-central1",
},
"claude-3-5-sonnet-20240620": {
vertexName: "claude-3-5-sonnet@20240620",
region: "us-east5",
},
};
var apiFormat;
addEventListener("fetch", (event) => {
event.respondWith(handleRequest(event.request));
});
async function handleRequest(request) {
let headers = new Headers({
"Access-Control-Allow-Origin": "*",
"Access-Control-Allow-Headers": "*",
"Access-Control-Allow-Methods": "GET, POST, OPTIONS",
});
if (request.method === "OPTIONS") {
return new Response(null, { headers });
} else if (request.method === "GET") {
return createErrorResponse(405, "invalid_request_error", "GET method is not allowed");
}
if (request.headers.get("x-api-key")) {
apiFormat = "claude";
var apiKey = request.headers.get("x-api-key");
} else {
apiFormat = "openai";
var apiKey = request.headers.get("Authorization").slice(7);
}
if (!API_KEY || API_KEY !== apiKey) {
return createErrorResponse(401, "authentication_error", "invalid x-api-key");
}
const signedJWT = await createSignedJWT(CLIENT_EMAIL, PRIVATE_KEY)
const [token, err] = await exchangeJwtForAccessToken(signedJWT)
if (token === null) {
console.log(`Invalid jwt token: ${err}`)
return createErrorResponse(500, "api_error", "invalid authentication credentials");
}
try {
const url = new URL(request.url);
const normalizedPathname = url.pathname.replace(/^(\/)+/, '/');
switch(normalizedPathname) {
case "/v1/v1/messages":
case "/v1/messages":
case "/messages":
case "/v1/chat/completions":
case "/v1/v1/chat/completions":
return handleMessagesEndpoint(request, token);
default:
return createErrorResponse(404, "not_found_error", "Not Found");
}
} catch (error) {
console.error(error);
return createErrorResponse(500, "api_error", `An unexpected error occurred: ${error.message}`);
}
}
async function handleMessagesEndpoint(request, api_token) {
const anthropicVersion = request.headers.get('anthropic-version');
if (anthropicVersion && anthropicVersion !== '2023-06-01' && apiFormat === 'claude') {
return createErrorResponse(400, "invalid_request_error", "API version not supported");
}
let payload;
try {
payload = await request.json();
} catch (err) {
return createErrorResponse(400, "invalid_request_error", `The request body is not valid JSON: ${err.message}`);
}
payload.anthropic_version = "vertex-2023-10-16";
payload = convertPayloadFormat(payload, apiFormat);
if (!payload.max_tokens) {
payload.max_tokens = 4000;
}
if (!payload.model) {
return createErrorResponse(400, "invalid_request_error", "Missing model in the request payload.");
} else if (!MODELS[payload.model]) {
return createErrorResponse(400, "invalid_request_error", `Model \`${payload.model}\` not found.`);
}
const stream = payload.stream || false;
const model = MODELS[payload.model];
const url = `https://${model.region}-aiplatform.googleapis.com/v1/projects/${PROJECT}/locations/${model.region}/publishers/anthropic/models/${model.vertexName}:streamRawPredict`;
delete payload.model;
let response, contentType
try {
response = await fetch(url, {
method: 'POST',
headers: {
'Content-Type': 'application/json',
'Authorization': `Bearer ${api_token}`
},
body: JSON.stringify(payload)
});
contentType = response.headers.get("Content-Type") || "application/json";
} catch (error) {
return createErrorResponse(500, "api_error", `Server Error: ${error.message}`);
}
if (stream && contentType.startsWith('text/event-stream')) {
if (!(response.body instanceof ReadableStream)) {
return createErrorResponse(500, "api_error", "Server Error: Response body is not a ReadableStream");
}
const encoder = new TextEncoder();
const decoder = new TextDecoder("utf-8");
let buffer = '';
let { readable, writable } = new TransformStream({
transform(chunk, controller) {
let decoded = decoder.decode(chunk, { stream: true });
buffer += decoded;
let eventList = buffer.split(/\r\n\r\n|\r\r|\n\n/g);
if (eventList.length === 0) return;
buffer = eventList.pop();
let stop = false;
for (let event of eventList) {
if (apiFormat === "openai") {
const eventMatch = event.match(/event:(.+?)\n/);
if (eventMatch[1].trim() === 'content_block_stop') {
stop = true;
}
if (eventMatch[1].trim() === "content_block_delta") {
const dataMatch = event.match(/data:(.+)$/);
let chunk_data = JSON.parse(dataMatch[1]);
let transformedData = {
id: '01234567-890a-bcde-f012-34567890abcd',
object: 'chat.completion.chunk',
created: Math.floor(Date.now() / 1000),
model: payload.model, // 使用原始请求体中的model字段
system_fingerprint: 'vertexai-cf-workers-123456789',
choices: [{
index: 0,
delta: { content: chunk_data.delta.text },
logprobs: null,
finish_reason: ''
}]
};
controller.enqueue(encoder.encode(`data: ${JSON.stringify(transformedData)}\n\n`));
} else {
continue;
}
} else {
controller.enqueue(encoder.encode(`${event}\n\n`));
}
}
},
});
response.body.pipeTo(writable);
return new Response(readable, {
status: response.status,
headers: {
"Content-Type": response.headers.get("Content-Type") || "text/event-stream",
"Access-Control-Allow-Origin": "*",
},
});
} else {
try {
let data = await response.json();
if (apiFormat === "openai") {
const transformedData = {
id: data.id || `chatcmpl-${Math.random().toString(36).substr(2, 9)}`,
object: "chat.completion",
created: Math.floor(Date.now() / 1000),
model: data.model || payload.model,
system_fingerprint: `fp_${Math.random().toString(36).substr(2, 8)}`,
choices: [{
index: 0,
message: {
role: data.role || "assistant",
content: data.content[0]?.text || "",
},
logprobs: null,
finish_reason: data.stop_reason || "stop"
}],
usage: {
prompt_tokens: data.usage?.input_tokens || 0,
completion_tokens: data.usage?.output_tokens || 0,
total_tokens: (data.usage?.input_tokens || 0) + (data.usage?.output_tokens || 0),
completion_tokens_details: {
reasoning_tokens: 0
}
}
};
return new Response(JSON.stringify(transformedData), {
status: response.status,
headers: {
"Content-Type": "application/json",
"Access-Control-Allow-Origin": "*",
},
});
} else {
return new Response(JSON.stringify(data), {
status: response.status,
headers: {
"Content-Type": contentType,
"Access-Control-Allow-Origin": "*",
},
});
}
} catch (error) {
console.error("Error processing API response:", error);
return createErrorResponse(500, "api_error", `Server Error: ${error.message}`);
}
}
}
function convertPayloadFormat(payload, apiFormat) {
if (apiFormat === "openai") {
const convertedPayload = {
...payload,
messages: []
};
for (const message of payload.messages) {
if (message.role === "system") {
// 如果 message.role 为 "system",将 message.content 赋值给 payload.system,并跳过这个 message
convertedPayload.system = message.content;
continue;
}
const convertedMessage = {
role: message.role,
content: []
};
// 判断 message.content 的类型是否为字符串
if (typeof message.content === "string") {
// 如果是字符串,直接将其作为文本类型添加到 convertedMessage.content 数组中
convertedMessage.content.push({
type: "text",
text: message.content
});
} else {
// 如果不是字符串,则认为它是一个数组,遍历数组中的每个 content 对象
for (const content of message.content) {
if (content.type === "text") {
convertedMessage.content.push({
type: "text",
text: content.text
});
} else if (content.type === "image_url") {
const [mediaType, imageData] = content.image_url.url.split(";base64,");
convertedMessage.content.push({
type: "image",
source: {
type: "base64",
media_type: mediaType.split(":")[1],
data: imageData
}
});
}
}
}
convertedPayload.messages.push(convertedMessage);
}
return convertedPayload;
}
return payload;
}
function createErrorResponse(status, errorType, message) {
const errorObject = { type: "error", error: { type: errorType, message: message } };
return new Response(JSON.stringify(errorObject), {
status: status,
headers: {
"Content-Type": "application/json",
"Access-Control-Allow-Origin": "*",
},
});
}
async function createSignedJWT(email, pkey) {
pkey = pkey.replace(/-----BEGIN PRIVATE KEY-----|-----END PRIVATE KEY-----|\r|\n|\\n/g, "");
let cryptoKey = await crypto.subtle.importKey(
"pkcs8",
str2ab(atob(pkey)),
{
name: "RSASSA-PKCS1-v1_5",
hash: { name: "SHA-256" },
},
false,
["sign"]
);
const authUrl = "https://www.googleapis.com/oauth2/v4/token";
const issued = Math.floor(Date.now() / 1000);
const expires = issued + 600;
const header = {
alg: "RS256",
typ: "JWT",
};
const payload = {
iss: email,
aud: authUrl,
iat: issued,
exp: expires,
scope: "https://www.googleapis.com/auth/cloud-platform",
};
const encodedHeader = urlSafeBase64Encode(JSON.stringify(header));
const encodedPayload = urlSafeBase64Encode(JSON.stringify(payload));
const unsignedToken = `${encodedHeader}.${encodedPayload}`;
const signature = await crypto.subtle.sign(
"RSASSA-PKCS1-v1_5",
cryptoKey,
str2ab(unsignedToken)
);
const encodedSignature = urlSafeBase64Encode(signature);
return `${unsignedToken}.${encodedSignature}`;
}
async function exchangeJwtForAccessToken(signed_jwt) {
const auth_url = "https://www.googleapis.com/oauth2/v4/token";
const params = {
grant_type: "urn:ietf:params:oauth:grant-type:jwt-bearer",
assertion: signed_jwt,
};
const r = await fetch(auth_url, {
method: "POST",
headers: { "Content-Type": "application/x-www-form-urlencoded" },
body: Object.entries(params)
.map(([k, v]) => k + "=" + v)
.join("&"),
}).then((res) => res.json());
if (r.access_token) {
return [r.access_token, ""];
}
return [null, JSON.stringify(r)];
}
function str2ab(str) {
const buffer = new ArrayBuffer(str.length);
let bufferView = new Uint8Array(buffer);
for (let i = 0; i < str.length; i++) {
bufferView[i] = str.charCodeAt(i);
}
return buffer;
}
function urlSafeBase64Encode(data) {
let base64 = typeof data === "string" ? btoa(encodeURIComponent(data).replace(/%([0-9A-F]{2})/g, (match, p1) => String.fromCharCode(parseInt("0x" + p1)))) : btoa(String.fromCharCode(...new Uint8Array(data)));
return base64.replace(/\+/g, "-").replace(/\//g, "_").replace(/=+$/, "");
}