aboutsummaryrefslogtreecommitdiffstats
path: root/src/Mapper.cxx
blob: ebc9f89df213dc43f9cb1f59ac28597ce44c7b90 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
/*
 * Copyright (C) 2003-2013 The Music Player Daemon Project
 * http://www.musicpd.org
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

/*
 * Maps directory and song objects to file system paths.
 */

#include "config.h"
#include "Mapper.hxx"
#include "Directory.hxx"
#include "Song.hxx"
#include "fs/AllocatedPath.hxx"
#include "fs/Traits.hxx"
#include "fs/Charset.hxx"
#include "fs/FileSystem.hxx"
#include "fs/DirectoryReader.hxx"
#include "util/Domain.hxx"
#include "Log.hxx"

#include <assert.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <errno.h>
#include <dirent.h>

static constexpr Domain mapper_domain("mapper");

/**
 * The absolute path of the music directory encoded in UTF-8.
 */
static std::string music_dir_utf8;
static size_t music_dir_utf8_length;

/**
 * The absolute path of the music directory encoded in the filesystem
 * character set.
 */
static AllocatedPath music_dir_fs = AllocatedPath::Null();

/**
 * The absolute path of the playlist directory encoded in the
 * filesystem character set.
 */
static AllocatedPath playlist_dir_fs = AllocatedPath::Null();

static void
check_directory(const char *path_utf8, const AllocatedPath &path_fs)
{
	struct stat st;
	if (!StatFile(path_fs, st)) {
		FormatErrno(mapper_domain,
			    "Failed to stat directory \"%s\"",
			    path_utf8);
		return;
	}

	if (!S_ISDIR(st.st_mode)) {
		FormatError(mapper_domain,
			    "Not a directory: %s", path_utf8);
		return;
	}

#ifndef WIN32
	const auto x = AllocatedPath::Build(path_fs, ".");
	if (!StatFile(x, st) && errno == EACCES)
		FormatError(mapper_domain,
			    "No permission to traverse (\"execute\") directory: %s",
			    path_utf8);
#endif

	const DirectoryReader reader(path_fs);
	if (reader.HasFailed() && errno == EACCES)
		FormatError(mapper_domain,
			    "No permission to read directory: %s", path_utf8);
}

static void
mapper_set_music_dir(AllocatedPath &&path)
{
	assert(!path.IsNull());

	music_dir_fs = std::move(path);
	music_dir_fs.ChopSeparators();

	music_dir_utf8 = music_dir_fs.ToUTF8();
	music_dir_utf8_length = music_dir_utf8.length();

	check_directory(music_dir_utf8.c_str(), music_dir_fs);
}

static void
mapper_set_playlist_dir(AllocatedPath &&path)
{
	assert(!path.IsNull());

	playlist_dir_fs = std::move(path);

	const auto utf8 = playlist_dir_fs.ToUTF8();
	check_directory(utf8.c_str(), playlist_dir_fs);
}

void
mapper_init(AllocatedPath &&_music_dir, AllocatedPath &&_playlist_dir)
{
	if (!_music_dir.IsNull())
		mapper_set_music_dir(std::move(_music_dir));

	if (!_playlist_dir.IsNull())
		mapper_set_playlist_dir(std::move(_playlist_dir));
}

void mapper_finish(void)
{
}

const char *
mapper_get_music_directory_utf8(void)
{
	return music_dir_utf8.c_str();
}

const AllocatedPath &
mapper_get_music_directory_fs(void)
{
	return music_dir_fs;
}

const char *
map_to_relative_path(const char *path_utf8)
{
	return !music_dir_utf8.empty() &&
		memcmp(path_utf8, music_dir_utf8.c_str(),
		       music_dir_utf8_length) == 0 &&
		PathTraits::IsSeparatorUTF8(path_utf8[music_dir_utf8_length])
		? path_utf8 + music_dir_utf8_length + 1
		: path_utf8;
}

AllocatedPath
map_uri_fs(const char *uri)
{
	assert(uri != NULL);
	assert(*uri != '/');

	if (music_dir_fs.IsNull())
		return AllocatedPath::Null();

	const auto uri_fs = AllocatedPath::FromUTF8(uri);
	if (uri_fs.IsNull())
		return AllocatedPath::Null();

	return AllocatedPath::Build(music_dir_fs, uri_fs);
}

AllocatedPath
map_directory_fs(const Directory &directory)
{
	assert(!music_dir_fs.IsNull());

	if (directory.IsRoot())
		return music_dir_fs;

	return map_uri_fs(directory.GetPath());
}

AllocatedPath
map_directory_child_fs(const Directory &directory, const char *name)
{
	assert(!music_dir_fs.IsNull());

	/* check for invalid or unauthorized base names */
	if (*name == 0 || strchr(name, '/') != NULL ||
	    strcmp(name, ".") == 0 || strcmp(name, "..") == 0)
		return AllocatedPath::Null();

	const auto parent_fs = map_directory_fs(directory);
	if (parent_fs.IsNull())
		return AllocatedPath::Null();

	const auto name_fs = AllocatedPath::FromUTF8(name);
	if (name_fs.IsNull())
		return AllocatedPath::Null();

	return AllocatedPath::Build(parent_fs, name_fs);
}

/**
 * Map a song object that was created by song_dup_detached().  It does
 * not have a real parent directory, only the dummy object
 * #detached_root.
 */
static AllocatedPath
map_detached_song_fs(const char *uri_utf8)
{
	auto uri_fs = AllocatedPath::FromUTF8(uri_utf8);
	if (uri_fs.IsNull())
		return uri_fs;

	return AllocatedPath::Build(music_dir_fs, uri_fs);
}

AllocatedPath
map_song_fs(const Song &song)
{
	assert(song.IsFile());

	if (song.IsInDatabase())
		return song.IsDetached()
			? map_detached_song_fs(song.uri)
			: map_directory_child_fs(*song.parent, song.uri);
	else
		return AllocatedPath::FromUTF8(song.uri);
}

std::string
map_fs_to_utf8(const char *path_fs)
{
	if (PathTraits::IsSeparatorFS(path_fs[0])) {
		path_fs = music_dir_fs.RelativeFS(path_fs);
		if (path_fs == nullptr || *path_fs == 0)
			return std::string();
	}

	return PathToUTF8(path_fs);
}

const AllocatedPath &
map_spl_path(void)
{
	return playlist_dir_fs;
}

AllocatedPath
map_spl_utf8_to_fs(const char *name)
{
	if (playlist_dir_fs.IsNull())
		return AllocatedPath::Null();

	std::string filename_utf8 = name;
	filename_utf8.append(PLAYLIST_FILE_SUFFIX);

	const auto filename_fs =
		AllocatedPath::FromUTF8(filename_utf8.c_str());
	if (filename_fs.IsNull())
		return AllocatedPath::Null();

	return AllocatedPath::Build(playlist_dir_fs, filename_fs);
}