重构 wbi golang 实现
This commit is contained in:
Miuzarte
@@ -380,178 +380,185 @@ bar=514&baz=1919810&foo=114&wts=1684805578&w_rid=bb97e15f28edf445a0e4420d36f0157
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### Golang
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### Golang
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需要 `github.com/tidwall/gjson` 作为依赖
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无第三方库
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```go
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```go
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package main
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package main
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import (
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import (
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"crypto/md5"
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"bytes"
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"encoding/hex"
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"crypto/md5"
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"fmt"
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"encoding/hex"
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"io"
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"encoding/json"
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"net/http"
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"fmt"
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"net/url"
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"io"
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"sort"
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"net/http"
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"strconv"
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"net/url"
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"strings"
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"strconv"
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"sync"
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"strings"
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"time"
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"time"
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"github.com/tidwall/gjson"
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)
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var (
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mixinKeyEncTab = []int{
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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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cache sync.Map
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lastUpdateTime time.Time
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)
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)
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func main() {
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func main() {
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urlStr := "https://api.bilibili.com/x/space/wbi/acc/info?mid=1850091"
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u, err := url.Parse("https://api.bilibili.com/x/space/wbi/acc/info?mid=1850091")
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newUrlStr, err := signAndGenerateURL(urlStr)
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if err != nil {
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if err != nil {
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panic(err)
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fmt.Printf("Error: %s", err)
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}
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return
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fmt.Printf("orig: %s\n", u.String())
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}
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err = Sign(u)
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req, err := http.NewRequest("GET", newUrlStr, nil)
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if err != nil {
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if err != nil {
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panic(err)
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fmt.Printf("Error: %s", err)
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}
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return
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fmt.Printf("signed: %s\n", u.String())
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}
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req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36")
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// 获取 wbi 时未修改 header
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req.Header.Set("Referer", "https://www.bilibili.com/")
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// 但实际使用签名后的 url 时发现风控较为严重
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response, err := http.DefaultClient.Do(req)
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if err != nil {
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fmt.Printf("Request failed: %s", err)
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return
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}
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defer response.Body.Close()
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body, err := io.ReadAll(response.Body)
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if err != nil {
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fmt.Printf("Failed to read response: %s", err)
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return
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}
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fmt.Println(string(body))
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}
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}
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func signAndGenerateURL(urlStr string) (string, error) {
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// Sign 为链接签名
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urlObj, err := url.Parse(urlStr)
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func Sign(u *url.URL) error {
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if err != nil {
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return wbiKeys.Sign(u)
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return "", err
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}
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imgKey, subKey := getWbiKeysCached()
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query := urlObj.Query()
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params := map[string]string{}
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for k, v := range query {
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params[k] = v[0]
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}
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newParams := encWbi(params, imgKey, subKey)
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for k, v := range newParams {
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query.Set(k, v)
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}
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urlObj.RawQuery = query.Encode()
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newUrlStr := urlObj.String()
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return newUrlStr, nil
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}
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}
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func encWbi(params map[string]string, imgKey, subKey string) map[string]string {
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// Update 无视过期时间更新
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mixinKey := getMixinKey(imgKey + subKey)
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func Update() error {
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currTime := strconv.FormatInt(time.Now().Unix(), 10)
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return wbiKeys.Update()
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params["wts"] = currTime
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// Sort keys
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keys := make([]string, 0, len(params))
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for k := range params {
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keys = append(keys, k)
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}
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sort.Strings(keys)
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// Remove unwanted characters
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for k, v := range params {
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v = sanitizeString(v)
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params[k] = v
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}
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// Build URL parameters
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query := url.Values{}
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for _, k := range keys {
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query.Set(k, params[k])
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}
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queryStr := query.Encode()
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// Calculate w_rid
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hash := md5.Sum([]byte(queryStr + mixinKey))
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params["w_rid"] = hex.EncodeToString(hash[:])
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return params
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}
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}
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func getMixinKey(orig string) string {
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func Get() (wk WbiKeys, err error) {
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var str strings.Builder
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if err = wk.update(false); err != nil {
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for _, v := range mixinKeyEncTab {
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return WbiKeys{}, err
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if v < len(orig) {
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}
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str.WriteByte(orig[v])
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return wbiKeys, nil
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}
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}
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return str.String()[:32]
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}
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}
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func sanitizeString(s string) string {
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var wbiKeys WbiKeys
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unwantedChars := []string{"!", "'", "(", ")", "*"}
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for _, char := range unwantedChars {
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type WbiKeys struct {
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s = strings.ReplaceAll(s, char, "")
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Img string
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}
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Sub string
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return s
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Mixin string
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lastUpdateTime time.Time
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}
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}
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func updateCache() {
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// Sign 为链接签名
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if time.Since(lastUpdateTime).Minutes() < 10 {
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func (wk *WbiKeys) Sign(u *url.URL) (err error) {
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return
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if err = wk.update(false); err != nil {
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}
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return err
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imgKey, subKey := getWbiKeys()
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}
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cache.Store("imgKey", imgKey)
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cache.Store("subKey", subKey)
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values := u.Query()
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lastUpdateTime = time.Now()
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values = removeUnwantedChars(values, '!', '\'', '(', ')', '*') // 必要性存疑?
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values.Set("wts", strconv.FormatInt(time.Now().Unix(), 10))
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// [url.Values.Encode] 内会对参数排序,
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// 且遍历 map 时本身就是无序的
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hash := md5.Sum([]byte(values.Encode() + wk.Mixin)) // Calculate w_rid
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values.Set("w_rid", hex.EncodeToString(hash[:]))
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u.RawQuery = values.Encode()
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return nil
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}
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}
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func getWbiKeysCached() (string, string) {
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// Update 无视过期时间更新
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updateCache()
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func (wk *WbiKeys) Update() (err error) {
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imgKeyI, _ := cache.Load("imgKey")
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return wk.update(true)
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subKeyI, _ := cache.Load("subKey")
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return imgKeyI.(string), subKeyI.(string)
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}
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}
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func getWbiKeys() (string, string) {
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// update 按需更新
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client := &http.Client{}
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func (wk *WbiKeys) update(purge bool) error {
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req, err := http.NewRequest("GET", "https://api.bilibili.com/x/web-interface/nav", nil)
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if !purge && time.Since(wk.lastUpdateTime) < time.Hour {
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if err != nil {
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return nil
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fmt.Printf("Error creating request: %s", err)
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}
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return "", ""
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}
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// 测试下来不用修改 header 也能过
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req.Header.Set("User-Agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36")
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resp, err := http.Get("https://api.bilibili.com/x/web-interface/nav")
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req.Header.Set("Referer", "https://www.bilibili.com/")
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if err != nil {
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resp, err := client.Do(req)
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return err
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if err != nil {
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}
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fmt.Printf("Error sending request: %s", err)
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defer resp.Body.Close()
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return "", ""
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body, err := io.ReadAll(resp.Body)
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}
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if err != nil {
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defer resp.Body.Close()
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return err
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body, err := io.ReadAll(resp.Body)
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}
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if err != nil {
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fmt.Printf("Error reading response: %s", err)
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nav := Nav{}
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return "", ""
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err = json.Unmarshal(body, &nav)
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}
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if err != nil {
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json := string(body)
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return err
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imgURL := gjson.Get(json, "data.wbi_img.img_url").String()
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}
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subURL := gjson.Get(json, "data.wbi_img.sub_url").String()
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imgKey := strings.Split(strings.Split(imgURL, "/")[len(strings.Split(imgURL, "/"))-1], ".")[0]
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if nav.Code != 0 && nav.Code != -101 { // -101 未登录时也会返回两个 key
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subKey := strings.Split(strings.Split(subURL, "/")[len(strings.Split(subURL, "/"))-1], ".")[0]
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return fmt.Errorf("unexpected code: %d, message: %s", nav.Code, nav.Message)
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return imgKey, subKey
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}
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img := nav.Data.WbiImg.ImgUrl
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sub := nav.Data.WbiImg.SubUrl
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if img == "" || sub == "" {
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return fmt.Errorf("empty image or sub url: %s", body)
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}
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// https://i0.hdslb.com/bfs/wbi/7cd084941338484aae1ad9425b84077c.png
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imgParts := strings.Split(img, "/")
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subParts := strings.Split(sub, "/")
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// 7cd084941338484aae1ad9425b84077c.png
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imgPng := imgParts[len(imgParts)-1]
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subPng := subParts[len(subParts)-1]
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// 7cd084941338484aae1ad9425b84077c
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wbiKeys.Img = strings.TrimSuffix(imgPng, ".png")
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wbiKeys.Sub = strings.TrimSuffix(subPng, ".png")
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wbiKeys.mixin()
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wbiKeys.lastUpdateTime = time.Now()
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return nil
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}
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func (wk *WbiKeys) mixin() {
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var mixin [32]byte
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wbi := wk.Img + wk.Sub
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for i := range mixin { // for i := 0; i < len(mixin); i++ {
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mixin[i] = wbi[mixinKeyEncTab[i]]
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}
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wk.Mixin = string(mixin[:])
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}
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var mixinKeyEncTab = [...]int{
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46, 47, 18, 2, 53, 8, 23, 32,
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15, 50, 10, 31, 58, 3, 45, 35,
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27, 43, 5, 49, 33, 9, 42, 19,
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29, 28, 14, 39, 12, 38, 41, 13,
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37, 48, 7, 16, 24, 55, 40, 61,
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26, 17, 0, 1, 60, 51, 30, 4,
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22, 25, 54, 21, 56, 59, 6, 63,
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57, 62, 11, 36, 20, 34, 44, 52,
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}
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func removeUnwantedChars(v url.Values, chars ...byte) url.Values {
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b := []byte(v.Encode())
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for _, c := range chars {
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b = bytes.ReplaceAll(b, []byte{c}, nil)
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}
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s, err := url.ParseQuery(string(b))
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if err != nil {
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panic(err)
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}
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return s
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}
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type Nav struct {
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Code int `json:"code"`
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Message string `json:"message"`
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Ttl int `json:"ttl"`
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Data struct {
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WbiImg struct {
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ImgUrl string `json:"img_url"`
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SubUrl string `json:"sub_url"`
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} `json:"wbi_img"`
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// ......
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} `json:"data"`
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}
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}
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```
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```
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