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131 lines
3.1 KiB
Go
131 lines
3.1 KiB
Go
package bilibili
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import (
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"crypto/md5"
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"encoding/hex"
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"errors"
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"net/http"
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"net/url"
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"sort"
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"strconv"
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"strings"
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"time"
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json "github.com/json-iterator/go"
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"github.com/synctv-org/synctv/utils"
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refreshcache "github.com/synctv-org/synctv/utils/refreshCache"
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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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wbiCache = refreshcache.NewRefreshCache[key](func() (key, error) {
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imgKey, subKey, err := getWbiKeys()
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if err != nil {
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return key{}, err
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}
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return key{imgKey, subKey}, nil
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}, time.Minute*10)
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)
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type key struct {
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imgKey, subKey string
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}
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func signAndGenerateURL(urlStr string) (string, error) {
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urlObj, err := url.Parse(urlStr)
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if err != nil {
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return "", err
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}
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key, err := wbiCache.Get()
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if err != nil {
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return "", err
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}
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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, key.imgKey, key.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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return urlObj.String(), nil
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}
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func encWbi(params map[string]string, imgKey, subKey string) map[string]string {
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mixinKey := getMixinKey(imgKey + subKey)
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currTime := strconv.FormatInt(time.Now().Unix(), 10)
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params["wts"] = currTime
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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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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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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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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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func getMixinKey(orig string) string {
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var str strings.Builder
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for _, v := range mixinKeyEncTab {
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if v < len(orig) {
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str.WriteByte(orig[v])
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}
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}
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return str.String()[:32]
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}
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func sanitizeString(s string) string {
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unwantedChars := []string{"!", "'", "(", ")", "*"}
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for _, char := range unwantedChars {
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s = strings.ReplaceAll(s, char, "")
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}
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return s
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}
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func getWbiKeys() (string, string, error) {
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req, err := http.NewRequest(http.MethodGet, "https://api.bilibili.com/x/web-interface/nav", nil)
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if err != nil {
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return "", "", err
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}
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req.Header.Set("User-Agent", utils.UA)
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req.Header.Set("Referer", "https://www.bilibili.com")
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resp, err := http.DefaultClient.Do(req)
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if err != nil {
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return "", "", err
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}
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defer resp.Body.Close()
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info := Nav{}
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err = json.NewDecoder(resp.Body).Decode(&info)
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if err != nil {
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return "", "", err
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}
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if info.Data.WbiImg.ImgURL == "" || info.Data.WbiImg.SubURL == "" {
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return "", "", errors.New(info.Message)
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}
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imgKey := strings.Split(strings.Split(info.Data.WbiImg.ImgURL, "/")[len(strings.Split(info.Data.WbiImg.ImgURL, "/"))-1], ".")[0]
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subKey := strings.Split(strings.Split(info.Data.WbiImg.SubURL, "/")[len(strings.Split(info.Data.WbiImg.SubURL, "/"))-1], ".")[0]
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return imgKey, subKey, nil
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}
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