83 lines
2.5 KiB
JavaScript
83 lines
2.5 KiB
JavaScript
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const crypto = require("crypto");
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/**
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* 获取微信读书的书籍 ID
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* 感谢 @MCBBC 及 ChatGPT
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* @param {string} bookId - 书籍 ID
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* @returns {string} - 唯一的书籍 ID
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*/
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const getWereadID = (bookId) => {
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try {
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// 使用 MD5 哈希算法创建哈希对象
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const hash = crypto.createHash("md5");
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hash.update(bookId);
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const str = hash.digest("hex");
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// 取哈希结果的前三个字符作为初始值
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let strSub = str.substring(0, 3);
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// 判断书籍 ID 的类型并进行转换
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let fa;
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if (/^\d*$/.test(bookId)) {
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// 如果书籍 ID 只包含数字，则将其拆分成长度为 9 的子字符串，并转换为十六进制表示
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const chunks = [];
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for (let i = 0; i < bookId.length; i += 9) {
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const chunk = bookId.substring(i, i + 9);
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chunks.push(parseInt(chunk).toString(16));
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}
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fa = ["3", chunks];
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} else {
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// 如果书籍 ID 包含其他字符，则将每个字符的 Unicode 编码转换为十六进制表示
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let hexStr = "";
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for (let i = 0; i < bookId.length; i++) {
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hexStr += bookId.charCodeAt(i).toString(16);
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}
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fa = ["4", [hexStr]];
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}
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// 将类型添加到初始值中
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strSub += fa[0];
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// 将数字2和哈希结果的后两个字符添加到初始值中
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strSub += "2" + str.substring(str.length - 2);
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// 处理转换后的子字符串数组
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for (let i = 0; i < fa[1].length; i++) {
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const sub = fa[1][i];
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const subLength = sub.length.toString(16);
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// 如果长度只有一位数，则在前面添加0
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const subLengthPadded =
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subLength.length === 1 ? "0" + subLength : subLength;
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// 将长度和子字符串添加到初始值中
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strSub += subLengthPadded + sub;
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// 如果不是最后一个子字符串，则添加分隔符 'g'
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if (i < fa[1].length - 1) {
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strSub += "g";
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}
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}
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// 如果初始值长度不足 20，从哈希结果中取足够的字符补齐
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if (strSub.length < 20) {
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strSub += str.substring(0, 20 - strSub.length);
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}
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// 使用 MD5 哈希算法创建新的哈希对象
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const finalHash = crypto.createHash("md5");
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finalHash.update(strSub);
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const finalStr = finalHash.digest("hex");
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// 取最终哈希结果的前三个字符并添加到初始值的末尾
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strSub += finalStr.substring(0, 3);
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return strSub;
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} catch (error) {
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console.error("处理微信读书 ID 时出现错误：" + error);
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return null;
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}
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};
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module.exports = getWereadID;
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