safetwitch-backend/extractor/twitch/parser.go

package twitch

import (
	"encoding/base64"
	"errors"
	"os"
	"safetwitch-backend/extractor"
	"safetwitch-backend/extractor/structs"
	"strings"
	"time"

	"github.com/tidwall/gjson"
)

func ParseStreamer(streamerData gjson.Result, isLive bool, socials []structs.Social, stream *structs.Stream) (structs.Streamer, error) {
	// Store streamerColorHex in memory to use as pointer
	var streamerColorHex *string
	rawStreamerColorHex := streamerData.Get("user.primaryColorHex").String()
	if rawStreamerColorHex == "" {
		streamerColorHex = nil
	} else {
		streamerColorHex = &rawStreamerColorHex
	}

	parsedStreamer := structs.Streamer{
		Username:  streamerData.Get("user.displayName").String(),
		About:     streamerData.Get("user.description").String(),
		Pfp:       extractor.ProxyUrl(streamerData.Get("user.profileImageURL").String()),
		Followers: int(streamerData.Get("user.followers.totalCount").Int()),
		Socials:   socials,
		IsLive:    isLive,
		IsPartner: streamerData.Get("user.isPartner").Bool(),
		ColorHex:  streamerColorHex,
		Id:        streamerData.Get("user.id").String(),
		Stream:    stream,
	}

	return parsedStreamer, nil
}

func ParseSocials(data string) ([]structs.Social, error) {
	var parsedSocials []structs.Social
	result := gjson.Get(data, "user.channel.socialMedias")
	for _, social := range result.Array() {
		parsedSocials = append(parsedSocials, structs.Social{
			Name: social.Get("title").String(),
			Type: social.Get("name").String(),
			Url:  social.Get("url").String(),
		})
	}

	if !result.Exists() {
		return parsedSocials, errors.New("error while parsing socials, path does not exist")
	}

	return parsedSocials, nil
}

func ParseStream(data string) (*structs.Stream, error) {
	// check if live
	stream := gjson.Get(data, "1.data.user.stream")
	if !stream.IsObject() {
		return nil, errors.New("streamer is not live")
	}

	var tags []string
	tagArea := gjson.Get(data, "2.data.user.stream.freeformTags").Array()
	for _, tag := range tagArea {
		tags = append(tags, tag.Get("name").String())
	}

	time, err := time.Parse(time.RFC3339, stream.Get("createdAt").String())
	if err != nil {
		return &structs.Stream{}, err
	}

	parsedStream := structs.Stream{
		Title:     gjson.Get(data, "1.data.user.lastBroadcast.title").String(),
		Topic:     stream.Get("game.name").String(),
		StartedAt: time,
		Tags:      tags,
		Viewers:   int(gjson.Get(data, "4.data.user.stream.viewersCount").Int()),
		Preview:   extractor.ProxyUrl(gjson.Get(data, "3.data.user.stream.previewImageURL").String()),
	}

	return &parsedStream, nil
}

// discover
func ParseCategory(data gjson.Result) (structs.CategoryPreview, error) {
	tags := data.Get("node.tags").Array()
	var parsedTags []string

	for _, tag := range tags {
		parsedTags = append(parsedTags, tag.Get("localizedName").String())
	}

	return structs.CategoryPreview{
		Name:        data.Get("node.name").String(),
		DisplayName: data.Get("node.displayName").String(),
		Viewers:     int(data.Get("node.viewersCount").Int()),
		CreatedAt:   data.Get("node.originalReleaseDate").Time(),
		Tags:        parsedTags,
		Cursor:      data.Get("node.cursor").String(),
		Image:       extractor.ProxyUrl(data.Get("node.avatarURL").String()),
	}, nil
}

func ParseMinifiedStream(data gjson.Result) (structs.CategoryMinifiedStream, error) {
	var tags []string
	tagArea := data.Get("node.freeformTacgs").Array()
	for _, tag := range tagArea {
		tags = append(tags, tag.Get("name").String())
	}

	// Store streamerColorHex in memory to use as pointer
	var streamerColorHex *string
	rawStreamerColorHex := data.Get("node.broadcaster.primaryColorHex").String()
	if rawStreamerColorHex == "" {
		streamerColorHex = nil
	} else {
		streamerColorHex = &rawStreamerColorHex
	}

	parsedStream := structs.CategoryMinifiedStream{
		Title:   data.Get("node.title").String(),
		Viewers: int(data.Get("node.viewersCount").Int()),
		Preview: extractor.ProxyUrl(data.Get("node.previewImageURL").String()),
		Tags:    tags,
		Streamer: structs.CategoryMinifiedStreamer{
			Name:     data.Get("node.broadcaster.login").String(),
			Pfp:      extractor.ProxyUrl(data.Get("node.broadcaster.profileImageURL").String()),
			ColorHex: streamerColorHex,
		},
		Cursor: data.Get("cursor").String(),
	}

	return parsedStream, nil
}

func ParseBadges(data gjson.Result) ([]structs.Badge, error) {
	var formattedBadges = []structs.Badge{}

	for _, badge := range data.Array() {
		id := badge.Get("id").String()
		decodedId, err := base64.StdEncoding.DecodeString(id)
		if err != nil {
			return []structs.Badge{}, nil
		}

		formattedBadges = append(formattedBadges, structs.Badge{
			Id:      string(decodedId),
			SetId:   badge.Get("setID").String(),
			Title:   badge.Get("title").String(),
			Version: badge.Get("version").String(),
			Images: map[string]string{
				"image1x": extractor.ProxyUrl(badge.Get("image1x").String()),
				"image2x": extractor.ProxyUrl(badge.Get("image2x").String()),
				"image4x": extractor.ProxyUrl(badge.Get("image4x").String()),
			},
		})
	}

	return formattedBadges, nil
}

func StreamSubProxyUrl(url string) string {
	encodedUrl := base64.StdEncoding.EncodeToString([]byte(url))
	backendUrl := os.Getenv("URL")

	return backendUrl + "/proxy/stream/sub/" + encodedUrl
}

func StreamSegmentProxyUrl(url string) string {
	encodedUrl := base64.StdEncoding.EncodeToString([]byte(url))
	backendUrl := os.Getenv("URL")

	return backendUrl + "/proxy/stream/segment/" + encodedUrl
}

func ProxyPlaylistFile(playlist string, isSubPlaylist bool) string {
	// Split the playlist into individual entries
	entries := strings.Split(playlist, "\n")[1:] // Ignore the first line which contains the M3U header

	// Loop through each entry and replace the URL
	for i, entry := range entries {
		if strings.HasPrefix(entry, "http") { // Only modify lines that contain URLs
			var newURL string
			if isSubPlaylist {
				newURL = StreamSegmentProxyUrl(entry)
			} else {
				newURL = StreamSubProxyUrl(entry)
			}
			entries[i] = newURL
		}
	}

	// Join the modified entries back into a single string separated by a newline
	modifiedPlaylist := "#EXTM3U\n" + strings.Join(entries, "\n")

	return modifiedPlaylist

}