Added podcast support, only from subsonic API for now, ref #726
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emeric
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/*
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* Copyright (C) 2025 Emeric Poupon
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*
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* This file is part of LMS.
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*
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* LMS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* LMS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with LMS. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "RefreshPodcastsStep.hpp"
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#include "core/ILogger.hpp"
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#include "core/http/IClient.hpp"
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#include "database/IDb.hpp"
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#include "database/Session.hpp"
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#include "database/objects/Artwork.hpp"
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#include "database/objects/Image.hpp"
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#include "database/objects/Podcast.hpp"
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#include "database/objects/PodcastEpisode.hpp"
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#include "Executor.hpp"
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#include "PodcastParsing.hpp"
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#include "PodcastTypes.hpp"
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namespace lms::podcast
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{
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namespace
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{
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void removeArtwork(db::Session& session, const db::Artwork::pointer& artwork)
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{
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const auto underlyingImageId{ artwork->getUnderlyingId() };
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const auto* imageId{ std::get_if<db::ImageId>(&underlyingImageId) };
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assert(imageId); // these artworks can only be an image
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std::error_code ec;
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std::filesystem::remove(artwork->getAbsoluteFilePath(), ec);
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if (ec)
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LMS_LOG(PODCAST, WARNING, "Failed to remove old podcast artwork file '" << artwork->getAbsoluteFilePath() << "': " << ec.message());
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session.destroy<db::Image>(*imageId);
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}
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void updatePodcast(db::Session& session, db::PodcastId podcastId, const Podcast& podcast)
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{
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auto transaction{ session.createWriteTransaction() };
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db::Podcast::pointer dbPodcast{ db::Podcast::find(session, podcastId) };
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if (!dbPodcast)
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return; // may have been deleted by admin
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LMS_LOG(PODCAST, DEBUG, "Refreshing podcast '" << podcast.title << "' received from '" << dbPodcast->getUrl() << "'");
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// force update the podcast data
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if (!podcast.newUrl.empty() && podcast.newUrl != dbPodcast->getUrl())
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{
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LMS_LOG(PODCAST, INFO, "Podcast '" << podcast.title << "' : URL changed from '" << dbPodcast->getUrl() << "' to '" << podcast.newUrl << "'");
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dbPodcast.modify()->setUrl(podcast.newUrl);
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}
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dbPodcast.modify()->setAuthor(podcast.author);
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dbPodcast.modify()->setCategory(podcast.category);
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dbPodcast.modify()->setCopyright(podcast.copyright);
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dbPodcast.modify()->setDescription(podcast.description);
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dbPodcast.modify()->setExplicit(podcast.explicitContent ? *podcast.explicitContent : false);
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dbPodcast.modify()->setLanguage(podcast.language);
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dbPodcast.modify()->setLastBuildDate(podcast.lastBuildDate);
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dbPodcast.modify()->setLink(podcast.link);
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dbPodcast.modify()->setOwnerEmail(podcast.ownerEmail);
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dbPodcast.modify()->setOwnerName(podcast.ownerName);
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dbPodcast.modify()->setSubtitle(podcast.subtitle);
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dbPodcast.modify()->setSummary(podcast.summary);
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dbPodcast.modify()->setTitle(podcast.title);
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if (dbPodcast->getImageUrl() != podcast.imageUrl)
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{
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LMS_LOG(PODCAST, INFO, "Podcast '" << podcast.title << "' : image url changed from '" << dbPodcast->getImageUrl() << "' to '" << podcast.imageUrl << "'");
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if (db::Artwork::pointer currentArtwork{ dbPodcast->getArtwork() })
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removeArtwork(session, currentArtwork);
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dbPodcast.modify()->setImageUrl(podcast.imageUrl);
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}
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// Only create episodes if they are new, do not modify/update existing entries for now
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// TODO: update existing episodes, remove artwork if url changed
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Wt::WDateTime previousNewestEpisodeDateTime{};
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if (db::PodcastEpisode::pointer dbEpisode{ db::PodcastEpisode::findNewtestEpisode(session, podcastId) })
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previousNewestEpisodeDateTime = dbEpisode->getPubDate();
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// TODO: mark for deletion old episodes that are no longer referenced!!
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for (const auto& episode : podcast.episodes)
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{
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if (previousNewestEpisodeDateTime.isValid() && episode.pubDate <= previousNewestEpisodeDateTime)
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continue; // consider already in db
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LMS_LOG(PODCAST, DEBUG, "Adding episode '" << episode.title << "' to podcast '" << podcast.title << "'");
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auto dbEpisode{ session.create<db::PodcastEpisode>(dbPodcast) };
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dbEpisode.modify()->setAuthor(episode.author);
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dbEpisode.modify()->setCategory(episode.category);
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dbEpisode.modify()->setDescription(episode.description);
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dbEpisode.modify()->setEnclosureUrl(episode.enclosureUrl.url);
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dbEpisode.modify()->setEnclosureContentType(episode.enclosureUrl.type);
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dbEpisode.modify()->setEnclosureLength(episode.enclosureUrl.length);
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dbEpisode.modify()->setExplicit(episode.explicitContent ? *episode.explicitContent : false);
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dbEpisode.modify()->setLink(episode.link);
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dbEpisode.modify()->setPubDate(episode.pubDate);
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dbEpisode.modify()->setTitle(episode.title);
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dbEpisode.modify()->setImageUrl(episode.imageUrl);
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dbEpisode.modify()->setDuration(episode.duration);
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}
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}
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} // namespace
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core::LiteralString RefreshPodcastsStep::getName() const
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{
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return "Refresh podcasts";
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}
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void RefreshPodcastsStep::run()
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{
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auto& session{ getDb().getTLSSession() };
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auto transaction{ session.createReadTransaction() };
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db::Podcast::find(session, [this](const db::Podcast::pointer& podcast) {
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LMS_LOG(PODCAST, DEBUG, "Found podcast to refresh at '" << podcast->getUrl() << "'");
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podcastsToRefresh.push(podcast->getId());
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});
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refreshNextPodcast();
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}
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void RefreshPodcastsStep::refreshNextPodcast()
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{
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if (abortRequested())
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{
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onAbort();
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return;
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}
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getExecutor().post([this] {
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if (podcastsToRefresh.empty())
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{
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LMS_LOG(PODCAST, DEBUG, "All podcasts refreshed");
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onDone();
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return;
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}
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const db::PodcastId podcastId{ podcastsToRefresh.front() };
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podcastsToRefresh.pop();
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refreshPodcast(podcastId);
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});
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}
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void RefreshPodcastsStep::refreshPodcast(db::PodcastId podcastId)
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{
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auto& session{ getDb().getTLSSession() };
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auto transaction{ session.createReadTransaction() };
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const db::Podcast::pointer podcast{ db::Podcast::find(session, podcastId) };
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if (!podcast)
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{
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refreshNextPodcast(); // maybe removed in the meantime by admin
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return;
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}
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LMS_LOG(PODCAST, DEBUG, "Syncing podcast from '" << podcast->getUrl() << "'");
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const std::string url{ podcast->getUrl() };
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core::http::ClientGETRequestParameters params;
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params.relativeUrl = podcast->getUrl();
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params.onFailureFunc = [this, podcast] {
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LMS_LOG(PODCAST, ERROR, "Failed to sync podcast from '" << podcast->getUrl() << "'");
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refreshNextPodcast();
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};
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params.onSuccessFunc = [this, podcast, podcastId](const Wt::Http::Message& msg) {
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getExecutor().post([this, podcast, podcastId, msgBody = msg.body()] {
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try
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{
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const auto podcast{ parsePodcastRssFeed(msgBody) };
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updatePodcast(getDb().getTLSSession(), podcastId, podcast);
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}
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catch (const ParseException& e)
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{
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LMS_LOG(PODCAST, ERROR, "Failed to parse rss feed from '" << podcast->getUrl() << "': " << e.what());
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}
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refreshNextPodcast();
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});
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};
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params.onAbortFunc = [this] {
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onAbort();
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};
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getClient().sendGETRequest(std::move(params));
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}
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} // namespace lms::podcast
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