147 lines
3.4 KiB
C++
147 lines
3.4 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// Copyright The Music Player Daemon Project
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#include "TagAny.hxx"
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#include "TagStream.hxx"
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#include "TagFile.hxx"
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#include "tag/Generic.hxx"
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#include "song/LightSong.hxx"
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#include "db/Interface.hxx"
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#include "storage/StorageInterface.hxx"
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#include "client/Client.hxx"
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#include "protocol/Ack.hxx"
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#include "fs/AllocatedPath.hxx"
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#include "input/InputStream.hxx"
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#include "util/Compiler.h"
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#include "util/ScopeExit.hxx"
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#include "util/StringCompare.hxx"
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#include "util/UriExtract.hxx"
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#include "LocateUri.hxx"
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static void
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TagScanStream(const char *uri, TagHandler &handler)
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{
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Mutex mutex;
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auto is = InputStream::OpenReady(uri, mutex);
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if (!tag_stream_scan(*is, handler))
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throw ProtocolError(ACK_ERROR_NO_EXIST, "Failed to load file");
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ScanGenericTags(*is, handler);
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}
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static void
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TagScanFile(const Path path_fs, TagHandler &handler)
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{
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if (!ScanFileTagsNoGeneric(path_fs, handler))
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throw ProtocolError(ACK_ERROR_NO_EXIST, "Failed to load file");
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ScanGenericTags(path_fs, handler);
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}
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#ifdef ENABLE_DATABASE
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/**
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* Collapse "../" prefixes in a URI relative to the specified base
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* URI.
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*/
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static std::string
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ResolveUri(std::string_view base, const char *relative)
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{
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while (true) {
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const char *rest = StringAfterPrefix(relative, "../");
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if (rest == nullptr)
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break;
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if (base == ".")
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throw ProtocolError(ACK_ERROR_NO_EXIST, "Bad real URI");
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base = PathTraitsUTF8::GetParent(base);
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relative = rest;
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}
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return PathTraitsUTF8::Build(base, relative);
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}
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/**
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* Look up the specified song in the database and return its
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* (resolved) "real" URI.
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*/
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static std::string
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GetRealSongUri(Client &client, std::string_view uri)
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{
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const auto &db = client.GetDatabaseOrThrow();
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const auto *song = db.GetSong(uri);
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if (song == nullptr)
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throw ProtocolError(ACK_ERROR_NO_EXIST, "No such song");
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AtScopeExit(&db, song) { db.ReturnSong(song); };
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if (song->real_uri == nullptr)
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return {};
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return ResolveUri(PathTraitsUTF8::GetParent(uri), song->real_uri);
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}
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#endif
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static void
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TagScanDatabase(Client &client, const char *uri, TagHandler &handler)
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{
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#ifdef ENABLE_DATABASE
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const auto real_uri = GetRealSongUri(client, uri);
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if (!real_uri.empty()) {
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uri = real_uri.c_str();
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// TODO: support absolute paths?
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if (uri_has_scheme(uri))
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return TagScanStream(uri, handler);
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}
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const Storage *storage = client.GetStorage();
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if (storage == nullptr) {
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#else
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(void)client;
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(void)uri;
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(void)handler;
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#endif
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throw ProtocolError(ACK_ERROR_NO_EXIST, "No database");
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#ifdef ENABLE_DATABASE
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}
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if (const auto path_fs = storage->MapFS(uri); !path_fs.IsNull())
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return TagScanFile(path_fs, handler);
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if (const auto absolute_uri = storage->MapUTF8(uri);
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uri_has_scheme(absolute_uri))
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return TagScanStream(absolute_uri.c_str(), handler);
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throw ProtocolError(ACK_ERROR_NO_EXIST, "No such file");
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#endif
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}
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void
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TagScanAny(Client &client, const char *uri, TagHandler &handler)
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{
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const auto located_uri = LocateUri(UriPluginKind::INPUT, uri, &client
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#ifdef ENABLE_DATABASE
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, nullptr
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#endif
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);
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switch (located_uri.type) {
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case LocatedUri::Type::ABSOLUTE:
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return TagScanStream(located_uri.canonical_uri, handler);
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case LocatedUri::Type::RELATIVE:
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return TagScanDatabase(client, located_uri.canonical_uri,
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handler);
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case LocatedUri::Type::PATH:
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return TagScanFile(located_uri.path, handler);
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}
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gcc_unreachable();
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}
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