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Improve YouTube page feed detection
In order to be more resilient to YouTube URLs variation and to address this feature_request: https://github.com/miniflux/v2/issues/2628 I've reworked a bit the way the YouTube feed extraction is done. I've kept all the `FindSubscriptionsFromYouTube*` in order to keep all the existing unit tests as-is ensuring little to no regressions. By doing so, I had to call twice `youtubeURLIDExtractor`. Small performance penalty for peace of mind in my opinion. `youtubeURLIDExtractor` is made in a way only one kind of page can be detected at a time. This mean I can solve the "video in a playlist" feature_request by prioritizing the playlist ID over the Video ID Also, by using `url.Parse()` to get ids, it's safer to url mangle and variation. The most common variation being the `t=42` parameters that start the playback at a given position. Previously, this kind of url would not be detected as "YouTube URL". I deliberately ignored the url parsing error to keep previous behavior (skip the YouTube analysis and follow with the other analysis) I also tried to keep debug logs the same as before as much as I could. I manually tested all the YouTube cases (video,channel,playlist) and they all work as expected except for the video. But this one does not work either on main. The `meta` html tag that was searched for does not seem to exist anymore. fix: #2628
This commit is contained in:
Ztec
Frédéric Guillot
parent
07f6d397d4
commit
e54825bf02
2 changed files with 165 additions and 50 deletions
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@ -5,10 +5,13 @@ package subscription // import "miniflux.app/v2/internal/reader/subscription"
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"log/slog"
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"net/url"
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"regexp"
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"strings"
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"miniflux.app/v2/internal/config"
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"miniflux.app/v2/internal/integration/rssbridge"
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@ -22,10 +25,19 @@ import (
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"golang.org/x/net/html/charset"
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)
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type youtubeKind string
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const (
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youtubeIDKindChannel youtubeKind = "channel"
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youtubeIDKindVideo youtubeKind = "video"
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youtubeIDKindPlaylist youtubeKind = "playlist"
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)
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var (
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youtubeChannelRegex = regexp.MustCompile(`youtube\.com/channel/(.*)$`)
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youtubeVideoRegex = regexp.MustCompile(`youtube\.com/watch\?v=(.*)$`)
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youtubePlaylistRegex = regexp.MustCompile(`youtube\.com/playlist\?list=(.*)$`)
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youtubeHostRegex = regexp.MustCompile(`youtube\.com$`)
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youtubeChannelRegex = regexp.MustCompile(`channel/(.*)$`)
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errNotYoutubeUrl = fmt.Errorf("this website is not a YouTube page")
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)
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type SubscriptionFinder struct {
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@ -75,43 +87,40 @@ func (f *SubscriptionFinder) FindSubscriptions(websiteURL, rssBridgeURL string)
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return Subscriptions{NewSubscription(responseHandler.EffectiveURL(), responseHandler.EffectiveURL(), feedFormat)}, nil
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}
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// Step 2) Check if the website URL is a YouTube channel.
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slog.Debug("Try to detect feeds from YouTube channel page", slog.String("website_url", websiteURL))
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subscriptions, localizedError := f.FindSubscriptionsFromYouTubeChannelPage(websiteURL)
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if localizedError != nil {
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return nil, localizedError
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subscriptions := make(Subscriptions, 1)
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// Step 2) Parse URL to find feeds from YouTube.
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kind, _, err := youtubeURLIDExtractor(websiteURL)
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// If YouTube url has been detected, return the YouTube feed
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if err == nil || !errors.Is(err, errNotYoutubeUrl) {
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switch kind {
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case youtubeIDKindChannel:
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slog.Debug("Try to detect feeds from YouTube channel page", slog.String("website_url", websiteURL))
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subscriptions, localizedError = f.FindSubscriptionsFromYouTubeChannelPage(websiteURL)
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if localizedError != nil {
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return nil, localizedError
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}
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case youtubeIDKindVideo:
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slog.Debug("Try to detect feeds from YouTube video page", slog.String("website_url", websiteURL))
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subscriptions, localizedError = f.FindSubscriptionsFromYouTubeVideoPage(websiteURL)
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if localizedError != nil {
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return nil, localizedError
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}
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case youtubeIDKindPlaylist:
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slog.Debug("Try to detect feeds from YouTube playlist page", slog.String("website_url", websiteURL))
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subscriptions, localizedError = f.FindSubscriptionsFromYouTubePlaylistPage(websiteURL)
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if localizedError != nil {
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return nil, localizedError
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}
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}
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if len(subscriptions) > 0 {
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slog.Debug("Subscriptions found from YouTube page", slog.String("website_url", websiteURL), slog.Any("subscriptions", subscriptions))
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return subscriptions, nil
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}
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}
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if len(subscriptions) > 0 {
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slog.Debug("Subscriptions found from YouTube channel page", slog.String("website_url", websiteURL), slog.Any("subscriptions", subscriptions))
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return subscriptions, nil
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}
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// Step 3) Check if the website URL is a YouTube video.
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slog.Debug("Try to detect feeds from YouTube video page", slog.String("website_url", websiteURL))
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subscriptions, localizedError = f.FindSubscriptionsFromYouTubeVideoPage(websiteURL)
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if localizedError != nil {
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return nil, localizedError
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}
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if len(subscriptions) > 0 {
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slog.Debug("Subscriptions found from YouTube video page", slog.String("website_url", websiteURL), slog.Any("subscriptions", subscriptions))
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return subscriptions, nil
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}
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// Step 4) Check if the website URL is a YouTube playlist.
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slog.Debug("Try to detect feeds from YouTube playlist page", slog.String("website_url", websiteURL))
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subscriptions, localizedError = f.FindSubscriptionsFromYouTubePlaylistPage(websiteURL)
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if localizedError != nil {
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return nil, localizedError
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}
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if len(subscriptions) > 0 {
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slog.Debug("Subscriptions found from YouTube playlist page", slog.String("website_url", websiteURL), slog.Any("subscriptions", subscriptions))
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return subscriptions, nil
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}
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// Step 5) Parse web page to find feeds from HTML meta tags.
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// Step 3) Parse web page to find feeds from HTML meta tags.
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slog.Debug("Try to detect feeds from HTML meta tags",
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slog.String("website_url", websiteURL),
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slog.String("content_type", responseHandler.ContentType()),
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@ -126,7 +135,7 @@ func (f *SubscriptionFinder) FindSubscriptions(websiteURL, rssBridgeURL string)
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return subscriptions, nil
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}
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// Step 6) Check if the website URL can use RSS-Bridge.
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// Step 4) Check if the website URL can use RSS-Bridge.
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if rssBridgeURL != "" {
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slog.Debug("Try to detect feeds with RSS-Bridge", slog.String("website_url", websiteURL))
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subscriptions, localizedError := f.FindSubscriptionsFromRSSBridge(websiteURL, rssBridgeURL)
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@ -140,7 +149,7 @@ func (f *SubscriptionFinder) FindSubscriptions(websiteURL, rssBridgeURL string)
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}
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}
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// Step 7) Check if the website has a known feed URL.
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// Step 5) Check if the website has a known feed URL.
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slog.Debug("Try to detect feeds from well-known URLs", slog.String("website_url", websiteURL))
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subscriptions, localizedError = f.FindSubscriptionsFromWellKnownURLs(websiteURL)
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if localizedError != nil {
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@ -298,20 +307,24 @@ func (f *SubscriptionFinder) FindSubscriptionsFromRSSBridge(websiteURL, rssBridg
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}
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func (f *SubscriptionFinder) FindSubscriptionsFromYouTubeChannelPage(websiteURL string) (Subscriptions, *locale.LocalizedErrorWrapper) {
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matches := youtubeChannelRegex.FindStringSubmatch(websiteURL)
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kind, id, _ := youtubeURLIDExtractor(websiteURL)
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if len(matches) == 2 {
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feedURL := fmt.Sprintf(`https://www.youtube.com/feeds/videos.xml?channel_id=%s`, matches[1])
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if kind == youtubeIDKindChannel {
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feedURL := fmt.Sprintf(`https://www.youtube.com/feeds/videos.xml?channel_id=%s`, id)
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return Subscriptions{NewSubscription(websiteURL, feedURL, parser.FormatAtom)}, nil
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}
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slog.Debug("This website is not a YouTube channel page, the regex doesn't match", slog.String("website_url", websiteURL))
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return nil, nil
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}
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func (f *SubscriptionFinder) FindSubscriptionsFromYouTubeVideoPage(websiteURL string) (Subscriptions, *locale.LocalizedErrorWrapper) {
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if !youtubeVideoRegex.MatchString(websiteURL) {
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kind, _, err := youtubeURLIDExtractor(websiteURL)
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if err != nil {
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slog.Debug("Could not parse url", slog.String("website_url", websiteURL))
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}
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if kind != youtubeIDKindVideo {
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slog.Debug("This website is not a YouTube video page, the regex doesn't match", slog.String("website_url", websiteURL))
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return nil, nil
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}
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@ -337,10 +350,10 @@ func (f *SubscriptionFinder) FindSubscriptionsFromYouTubeVideoPage(websiteURL st
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}
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func (f *SubscriptionFinder) FindSubscriptionsFromYouTubePlaylistPage(websiteURL string) (Subscriptions, *locale.LocalizedErrorWrapper) {
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matches := youtubePlaylistRegex.FindStringSubmatch(websiteURL)
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kind, id, _ := youtubeURLIDExtractor(websiteURL)
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if len(matches) == 2 {
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feedURL := fmt.Sprintf(`https://www.youtube.com/feeds/videos.xml?playlist_id=%s`, matches[1])
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if kind == youtubeIDKindPlaylist {
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feedURL := fmt.Sprintf(`https://www.youtube.com/feeds/videos.xml?playlist_id=%s`, id)
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return Subscriptions{NewSubscription(websiteURL, feedURL, parser.FormatAtom)}, nil
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}
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@ -348,3 +361,38 @@ func (f *SubscriptionFinder) FindSubscriptionsFromYouTubePlaylistPage(websiteURL
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return nil, nil
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}
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func youtubeURLIDExtractor(websiteURL string) (idKind youtubeKind, id string, err error) {
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decodedUrl, err := url.Parse(websiteURL)
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if err != nil {
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return
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}
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if !youtubeHostRegex.MatchString(decodedUrl.Host) {
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slog.Debug("This website is not a YouTube page, the regex doesn't match", slog.String("website_url", websiteURL))
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err = errNotYoutubeUrl
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return
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}
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switch {
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case strings.HasPrefix(decodedUrl.Path, "/channel"):
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idKind = youtubeIDKindChannel
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matches := youtubeChannelRegex.FindStringSubmatch(decodedUrl.Path)
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id = matches[1]
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return
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case strings.HasPrefix(decodedUrl.Path, "/watch") && decodedUrl.Query().Has("list"):
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idKind = youtubeIDKindPlaylist
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id = decodedUrl.Query().Get("list")
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return
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case strings.HasPrefix(decodedUrl.Path, "/watch"):
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idKind = youtubeIDKindVideo
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id = decodedUrl.Query().Get("v")
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return
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case strings.HasPrefix(decodedUrl.Path, "/playlist"):
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idKind = youtubeIDKindPlaylist
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id = decodedUrl.Query().Get("list")
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return
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}
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err = fmt.Errorf("unable to extract youtube id from URL: %s", websiteURL)
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return
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}
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