306 lines
6.7 KiB
Go
306 lines
6.7 KiB
Go
package srun
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import (
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"errors"
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"fmt"
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log "github.com/sirupsen/logrus"
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"io"
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"net/http"
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"net/url"
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"regexp"
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"strings"
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"unsafe"
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)
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func (a *Api) NewDetector() *Detector {
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redirectReg, err := regexp.Compile(
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`<script>top\.self\.location\.href='(.*)'</script>|<meta http-equiv="refresh" content=".*?url=(.*?)"`,
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)
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if err != nil {
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panic(err)
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}
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return &Detector{
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api: a,
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redirectReg: redirectReg,
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}
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}
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type Detector struct {
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api *Api
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redirectReg *regexp.Regexp
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// 登录页 html data
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pageUrl string
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page []byte
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}
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func (a *Detector) _GET(client *http.Client, addr string) (*http.Response, error) {
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log.Debugln("HTTP GET", addr)
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req, err := http.NewRequest("GET", addr, nil)
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if err != nil {
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return nil, err
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}
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for k, v := range a.api.CustomHeader {
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req.Header.Set(k, fmt.Sprint(v))
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}
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return client.Do(req)
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}
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func (a *Detector) _DirectGET(addr string) (*http.Response, error) {
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return a._GET(a.api.Client, addr)
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}
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func (a *Detector) _NoDirectGET(addr string) (*http.Response, error) {
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return a._GET(a.api.NoDirect, addr)
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}
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func (a *Detector) _JoinRedirectLocation(addr *url.URL, loc string) (*url.URL, error) {
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if loc == "" {
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return nil, errors.New("目标跳转地址缺失")
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}
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if strings.HasPrefix(loc, "/") {
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locSplit := strings.Split(loc, "?")
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addr.Path = locSplit[0]
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if len(locSplit) > 1 {
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addr.RawQuery = locSplit[1]
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} else {
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addr.RawQuery = ""
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}
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return addr, nil
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} else {
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return url.Parse(loc)
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}
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}
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type _FollowRedirectConfig struct {
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// 获取到下一个请求地址时触发
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onNextAddr func(addr *url.URL) error
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}
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func (a *Detector) _FollowRedirect(addr *url.URL, conf _FollowRedirectConfig) (*http.Response, []byte, error) {
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addrCopy := *addr
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addr = &addrCopy
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var body []byte
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var res *http.Response
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for {
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var err error
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res, err = a._NoDirectGET(addr.String())
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if err != nil {
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return nil, nil, err
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}
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if res.StatusCode < 300 {
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body, err = io.ReadAll(res.Body)
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_ = res.Body.Close()
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if err != nil {
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return nil, nil, err
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}
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locMatch := a.redirectReg.FindSubmatch(body)
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if len(locMatch) >= 2 {
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for i := 1; i < len(locMatch); i++ {
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locBytes := locMatch[i]
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if len(locBytes) != 0 {
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addr, err = a._JoinRedirectLocation(addr, unsafe.String(unsafe.SliceData(locBytes), len(locBytes)))
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if err != nil {
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return nil, nil, err
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}
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break
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}
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}
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} else {
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break
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}
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} else {
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_, _ = io.Copy(io.Discard, res.Body)
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_ = res.Body.Close()
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if res.StatusCode < 400 {
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addr, err = a._JoinRedirectLocation(addr, res.Header.Get("location"))
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if err != nil {
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return nil, nil, err
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}
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} else {
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return nil, nil, fmt.Errorf("server return http status %d", res.StatusCode)
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}
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}
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if conf.onNextAddr != nil {
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if err = conf.onNextAddr(addr); err != nil {
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return nil, nil, err
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}
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}
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}
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return res, body, nil
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}
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func (a *Detector) _SearchAcid(query url.Values) (string, bool) {
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addr := query.Get(`ac_id`)
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return addr, addr != ""
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}
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// 用于直接获取登录页数据
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func (a *Detector) _RequestPageBytes() ([]byte, error) {
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if a.pageUrl != "" {
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res, err := a._DirectGET(a.pageUrl)
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if err != nil {
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return nil, err
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}
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defer res.Body.Close()
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if res.StatusCode != 200 {
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_, _ = io.Copy(io.Discard, res.Body)
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return nil, fmt.Errorf("server return http status: %d", res.StatusCode)
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}
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a.page, err = io.ReadAll(res.Body)
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if err != nil {
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return nil, err
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}
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return a.page, nil
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}
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baseUrl, err := url.Parse(a.api.BaseUrl)
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if err != nil {
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return nil, err
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}
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_, a.page, err = a._FollowRedirect(baseUrl, _FollowRedirectConfig{})
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return a.page, err
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}
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func (a *Detector) DetectEnc() (string, error) {
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if a.page == nil {
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_, err := a._RequestPageBytes()
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if err != nil {
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return "", err
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}
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}
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jsReg, err := regexp.Compile(`(?i)<script src="\.?(.+[./]portal[0-9]*\.js)(\?.*)?">`)
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if err != nil {
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return "", err
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}
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jsPathMatch := jsReg.FindSubmatch(a.page)
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if len(jsPathMatch) == 3 {
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jsPathBytes := jsPathMatch[1]
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jsPath := unsafe.String(unsafe.SliceData(jsPathBytes), len(jsPathBytes))
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jsUrl, err := url.Parse(a.api.BaseUrl)
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if err != nil {
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return "", err
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}
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jsUrl.Path = jsPath
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jsAddr := jsUrl.String()
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jsRes, err := a._DirectGET(jsAddr)
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if err != nil {
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return "", err
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}
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defer jsRes.Body.Close()
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if jsRes.StatusCode == 200 {
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jsContent, err := io.ReadAll(jsRes.Body)
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if err == nil {
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reg, err := regexp.Compile(`var enc = (.*?)[,;]`)
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if err != nil {
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return "", err
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}
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encMatch := reg.FindSubmatch(jsContent)
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if len(encMatch) == 2 {
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encBytes := encMatch[1]
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encStr := unsafe.String(unsafe.SliceData(encBytes), len(encBytes))
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encSplit := strings.Split(encStr, "+")
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for i, v := range encSplit {
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encSplit[i] = strings.Trim(strings.TrimSpace(v), "'\"")
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}
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enc := strings.Join(encSplit, "")
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return enc, nil
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}
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}
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} else {
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_, _ = io.Copy(io.Discard, jsRes.Body)
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}
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}
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return "", ErrEnvCannotFound
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}
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// DetectAcid err 为 nil 时 acid 一定存在
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func (a *Detector) DetectAcid() (string, error) {
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if a.page == nil {
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// page 有值时说明 reality 已进行过 query match，此部分可跳过
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// 从入口地址 url query 寻找 acid
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baseUrl, err := url.Parse(a.api.BaseUrl)
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if err != nil {
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return "", err
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}
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var AcidFound = errors.New("acid found")
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var acid string
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_, a.page, err = a._FollowRedirect(baseUrl, _FollowRedirectConfig{
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onNextAddr: func(addr *url.URL) error {
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var ok bool
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acid, ok = a._SearchAcid(addr.Query())
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if ok {
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a.pageUrl = addr.String()
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return AcidFound
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}
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return nil
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},
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})
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if err != nil {
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if errors.Is(err, AcidFound) {
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return acid, nil
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}
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return "", err
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}
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}
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// 从 html 寻找 acid
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var reg *regexp.Regexp
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reg, err := regexp.Compile(`"ac_id".*?value="(.+)"`)
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if err != nil {
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return "", err
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}
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result := reg.FindSubmatch(a.page)
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if len(result) == 2 {
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return string(result[1]), nil
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}
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return "", ErrAcidCannotFound
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}
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// Reality acid 可能为空字符串
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func (a *Detector) Reality(addr string, getAcid bool) (acid string, online bool, err error) {
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startUrl, err := url.Parse(addr)
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if err != nil {
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return "", false, err
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}
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var AlreadyOnline = errors.New("already online")
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finalRes, pageBytes, err := a._FollowRedirect(startUrl, _FollowRedirectConfig{
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onNextAddr: func(addr *url.URL) error {
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if addr.Host == startUrl.Host {
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return AlreadyOnline
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}
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if getAcid {
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acid, _ = a._SearchAcid(addr.Query())
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}
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return nil
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},
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})
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if err != nil {
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if errors.Is(err, AlreadyOnline) {
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online = true
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err = nil
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return
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}
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return
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}
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online = finalRes.Request.URL.Host == startUrl.Host
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a.page = pageBytes
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return
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}
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func (a *Detector) Reset() {
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a.pageUrl = ""
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a.page = nil
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}
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