liblibai
Version:
Official TypeScript client for LiblibAI API
69 lines • 2.64 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.getSignedUrl = void 0;
const hmacsha1 = require("./lib/hmacsha1");
/**
* Generates a random string of a specified length.
*
* @param length The length of the string to generate.
* @returns A random string of the specified length.
*/
function generateRandomString(length) {
const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
let result = '';
// Generate cryptographically secure random values using Math.random
// This is good enough for generating a nonce
for (let i = 0; i < length; i++) {
const randomIndex = Math.floor(Math.random() * chars.length);
result += chars[randomIndex];
}
return result;
}
/**
* Generates a URL signature.
*
* @param url The URL to sign.
* @param API_KEY The API key to use for signing.
* @param API_SECRET The API secret to use for signing.
* @returns An object containing the signature, timestamp, and signature nonce.
*/
const urlSignature = (url, API_KEY, API_SECRET) => {
if (!url)
return;
const timestamp = Date.now(); // 当前时间戳
const signatureNonce = generateRandomString(16); // 随机字符串，你可以任意设置，这个没有要求
// 原文 = URl地址 + "&" + 毫秒时间戳 + "&" + 随机字符串
const path = `${url}&${timestamp}&${signatureNonce}`;
const secretKey = API_SECRET; // 下单后在官网中，找到自己的 SecretKey'
const hash = hmacsha1(secretKey, path);
// 最后一步： encodeBase64URLSafeString(密文)
// 这一步很重要，生成安全字符串。java、Python 以外的语言，可以参考这个 JS 的处理
const signature = hash
.replace(/\+/g, "-")
.replace(/\//g, "_")
.replace(/=+$/, "");
return {
signature,
timestamp,
signatureNonce,
};
};
/**
* Generates a signed URL.
*
* @param url The URL to sign.
* @param API_KEY The API key to use for signing.
* @param API_SECRET The API secret to use for signing.
* @returns The signed URL.
*/
const getSignedUrl = (url, API_KEY, API_SECRET) => {
const result = urlSignature(url, API_KEY, API_SECRET);
if (!result) {
throw new Error('Invalid URL provided');
}
const { signature, timestamp, signatureNonce } = result;
const accessKey = API_KEY; // '下单后在官网中，找到自己的 AccessKey'
return `${url}?AccessKey=${accessKey}&Signature=${signature}&Timestamp=${timestamp}&SignatureNonce=${signatureNonce}`;
};
exports.getSignedUrl = getSignedUrl;
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