olivetv: update youtube api

Author: luxcgo

foundation/olivetv/youtube.go

@@ -1,11 +1,13 @@
 package olivetv
 
 import (
+	"bytes"
 	"fmt"
-	"strings"
 	"time"
 
-	"github.com/go-olive/olive/foundation/olivetv/util"
+	"github.com/imroc/req/v3"
+	jsoniter "github.com/json-iterator/go"
+	"golang.org/x/net/html"
 )
 
 func init() {
@@ -25,46 +27,141 @@ func (this *youtube) Snap(tv *TV) error {
 		Timestamp: time.Now().Unix(),
 	}
 
-	streamID, err := this.setRoomOn(tv)
-	if err != nil {
-		return err
-	}
-	return this.setStreamURL(tv, streamID)
+	return this.set(tv)
 }
 
-func (this *youtube) setRoomOn(tv *TV) (string, error) {
-	channelURL := fmt.Sprintf("https://www.youtube.com/channel/%s", tv.RoomID)
-	content, err := util.GetURLContent(channelURL)
+func (this *youtube) set(tv *TV) error {
+	liveURL := fmt.Sprintf("https://www.youtube.com/%s/live", tv.RoomID)
+	resp, err := req.C().R().Get(liveURL)
 	if err != nil {
-		return "", err
+		return fmt.Errorf("get video url failed: %w", err)
 	}
-	tv.roomOn = strings.Contains(content, `icon":{"iconType":"LIVE"}}`)
-	if !tv.roomOn {
-		return "", nil
+	videoHTML := resp.Bytes()
+
+	// PlayerResponse
+	prb := this.playerResponseBytes(videoHTML)
+	if len(prb) == 0 {
+		return fmt.Errorf("unable to retrieve player response object from watch page")
 	}
-	streamID, err := util.Match(`"videoRenderer":{"videoId":"([^"]+)",`, content)
+	var pr YoutubePlayerResponse
+
+	err = jsoniter.Unmarshal(prb, &pr)
 	if err != nil {
-		return "", err
+		return fmt.Errorf("unmarshal pr failed: %w", err)
 	}
-	return streamID, nil
+
+	tv.streamURL = fmt.Sprintf("https://www.youtube.com/watch?v=%s", pr.VideoDetails.VideoID)
+	tv.roomOn = pr.VideoDetails.IsLive
+	tv.roomName = pr.VideoDetails.Title
+	tv.streamerName = pr.VideoDetails.Author
+
+	return nil
 }
 
-func (this *youtube) setStreamURL(tv *TV, streamID string) error {
-	if !tv.roomOn {
-		return nil
-	}
-	// youtube possibly have multiple lives in one channel,
-	// curruently the program returns the first one.
-	roomURL := fmt.Sprintf("https://www.youtube.com/watch?v=%s", streamID)
-	tv.streamURL = roomURL
-	roomContent, err := util.GetURLContent(roomURL)
-	if err != nil {
-		return err
-	}
-	title, err := util.Match(`name="title" content="([^"]+)"`, roomContent)
-	if err != nil {
-		return err
+// playerResponseBytes searches the given HTML for the player response object
+func (this *youtube) playerResponseBytes(data []byte) []byte {
+	playerRespDecl := []byte("var ytInitialPlayerResponse =")
+	var objData []byte
+	reader := bytes.NewReader(data)
+	tokenizer := html.NewTokenizer(reader)
+	isScript := false
+
+	for {
+		tt := tokenizer.Next()
+		switch tt {
+		case html.ErrorToken:
+			return objData
+		case html.TextToken:
+			if isScript {
+				data := tokenizer.Text()
+				declStart := bytes.Index(data, playerRespDecl)
+				if declStart < 0 {
+					continue
+				}
+
+				// Maybe add a LogTrace in the future for stuff like this
+				//LogDebug("Found script element with player response in watch page.")
+				objStart := bytes.Index(data[declStart:], []byte("{")) + declStart
+				objEnd := bytes.LastIndex(data[objStart:], []byte("};")) + 1 + objStart
+
+				if objEnd > objStart {
+					objData = data[objStart:objEnd]
+				}
+
+				return objData
+			}
+		case html.StartTagToken:
+			tn, _ := tokenizer.TagName()
+			if string(tn) == "script" {
+				isScript = true
+			} else {
+				isScript = false
+			}
+		}
 	}
-	tv.roomName = title
-	return nil
+}
+
+type YoutubePlayerResponse struct {
+	ResponseContext struct {
+		MainAppWebResponseContext struct {
+			LoggedOut bool `json:"loggedOut"`
+		} `json:"mainAppWebResponseContext"`
+	} `json:"responseContext"`
+	PlayabilityStatus struct {
+		Status            string `json:"status"`
+		Reason            string `json:"reason"`
+		LiveStreamability struct {
+			LiveStreamabilityRenderer struct {
+				VideoID      string `json:"videoId"`
+				OfflineSlate struct {
+					LiveStreamOfflineSlateRenderer struct {
+						ScheduledStartTime string `json:"scheduledStartTime"`
+					} `json:"liveStreamOfflineSlateRenderer"`
+				} `json:"offlineSlate"`
+				PollDelayMs string `json:"pollDelayMs"`
+			} `json:"liveStreamabilityRenderer"`
+		} `json:"liveStreamability"`
+	} `json:"playabilityStatus"`
+	StreamingData struct {
+		ExpiresInSeconds string `json:"expiresInSeconds"`
+		AdaptiveFormats  []struct {
+			Itag              int     `json:"itag"`
+			URL               string  `json:"url"`
+			MimeType          string  `json:"mimeType"`
+			QualityLabel      string  `json:"qualityLabel,omitempty"`
+			TargetDurationSec float64 `json:"targetDurationSec"`
+		} `json:"adaptiveFormats"`
+		DashManifestURL string `json:"dashManifestUrl"`
+		HlsManifestURL  string `json:"hlsManifestUrl"`
+	} `json:"streamingData"`
+	VideoDetails struct {
+		VideoID          string  `json:"videoId"`
+		Title            string  `json:"title"`
+		LengthSeconds    string  `json:"lengthSeconds"`
+		IsLive           bool    `json:"isLive"`
+		ChannelID        string  `json:"channelId"`
+		IsOwnerViewing   bool    `json:"isOwnerViewing"`
+		ShortDescription string  `json:"shortDescription"`
+		AverageRating    float64 `json:"averageRating"`
+		AllowRatings     bool    `json:"allowRatings"`
+		ViewCount        string  `json:"viewCount"`
+		Author           string  `json:"author"`
+		IsLiveContent    bool    `json:"isLiveContent"`
+	} `json:"videoDetails"`
+	Microformat struct {
+		PlayerMicroformatRenderer struct {
+			Thumbnail struct {
+				Thumbnails []struct {
+					URL string `json:"url"`
+				} `json:"thumbnails"`
+			} `json:"thumbnail"`
+			LiveBroadcastDetails struct {
+				IsLiveNow      bool   `json:"isLiveNow"`
+				StartTimestamp string `json:"startTimestamp"`
+				EndTimestamp   string `json:"endTimestamp"`
+			} `json:"liveBroadcastDetails"`
+			PublishDate string `json:"publishDate"`
+			UploadDate  string `json:"uploadDate"`
+		} `json:"playerMicroformatRenderer"`
+	} `json:"microformat"`
 }