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71 lines
2.3 KiB
JavaScript
71 lines
2.3 KiB
JavaScript
import md5 from 'md5'
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import { BILI_NAV } from "../constants/tools.js";
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const mixinKeyEncTab = [
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46, 47, 18, 2, 53, 8, 23, 32, 15, 50, 10, 31, 58, 3, 45, 35, 27, 43, 5, 49,
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33, 9, 42, 19, 29, 28, 14, 39, 12, 38, 41, 13, 37, 48, 7, 16, 24, 55, 40,
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61, 26, 17, 0, 1, 60, 51, 30, 4, 22, 25, 54, 21, 56, 59, 6, 63, 57, 62, 11,
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36, 20, 34, 44, 52
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]
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// 对 imgKey 和 subKey 进行字符顺序打乱编码
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const getMixinKey = (orig) => mixinKeyEncTab.map(n => orig[n]).join('').slice(0, 32)
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// 为请求参数进行 wbi 签名
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function encWbi(params, img_key, sub_key) {
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const mixin_key = getMixinKey(img_key + sub_key),
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curr_time = Math.round(Date.now() / 1000),
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chr_filter = /[!'()*]/g
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Object.assign(params, { wts: curr_time }) // 添加 wts 字段
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// 按照 key 重排参数
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const query = Object
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.keys(params)
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.sort()
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.map(key => {
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// 过滤 value 中的 "!'()*" 字符
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const value = params[key].toString().replace(chr_filter, '')
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return `${encodeURIComponent(key)}=${encodeURIComponent(value)}`
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})
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.join('&')
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const wbi_sign = md5(query + mixin_key) // 计算 w_rid
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return query + '&w_rid=' + wbi_sign
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}
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// 获取最新的 img_key 和 sub_key
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async function getWbiKeys(SESSDATA) {
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const res = await fetch(BILI_NAV, {
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headers: {
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// SESSDATA 字段
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Cookie: `SESSDATA=${SESSDATA}`
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}
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})
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const { data: { wbi_img: { img_url, sub_url } } } = await res.json()
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return {
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img_key: img_url.slice(
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img_url.lastIndexOf('/') + 1,
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img_url.lastIndexOf('.')
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),
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sub_key: sub_url.slice(
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sub_url.lastIndexOf('/') + 1,
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sub_url.lastIndexOf('.')
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)
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}
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}
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/**
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* 算法来自：https://github.com/SocialSisterYi/bilibili-API-collect/blob/master/docs/misc/sign/wbi.md
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* 参考了算法来源：https://github.com/SocialSisterYi/bilibili-API-collect/issues/631
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* @return {Promise<string>}
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*/
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export async function getWbi(videoData, SESSDATA) {
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const web_keys = await getWbiKeys(SESSDATA)
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const params = { ...videoData },
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img_key_res = web_keys.img_key,
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sub_key_res = web_keys.sub_key
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// eg. bar=514&baz=1919810&foo=114&wts=1684805578&w_rid=bb97e15f28edf445a0e4420d36f0157e
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return encWbi(params, img_key_res, sub_key_res);
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} |