summaryrefslogtreecommitdiffstats
path: root/application/models/Mfile.php
blob: 2c433887d0e4ce33778eeb5b31df827a49c8d9ba (plain)
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
266
267
268
269
270
271
272
273
274
<?php
/*
 * Copyright 2009-2013 Florian "Bluewind" Pritz <bluewind@server-speed.net>
 *
 * Licensed under AGPLv3
 * (see COPYING for full license text)
 *
 */

class Mfile extends CI_Model {

	private $upload_path;

	function __construct()
	{
		$this->load->model("muser");

		$this->upload_path = $this->config->item('upload_path');
		$this->id_validation_config = array(
			"upload_max_age" => $this->config->item("upload_max_age"),
			"small_upload_size" => $this->config->item("small_upload_size"),
			"sess_expiration" => $this->config->item("sess_expiration"),
		);
	}

	// Returns an unused ID
	function new_id($min = 3, $max = 6)
	{
		static $id_blacklist = NULL;

		if ($id_blacklist == NULL) {
			// This prevents people from being unable to access their uploads
			// because of URL rewriting
			$id_blacklist = scandir(FCPATH);
			$id_blacklist[] = "file";
			$id_blacklist[] = "user";
		}

		$max_tries = 100;

		for ($try = 0; $try < $max_tries; $try++) {
			$id = random_alphanum($min, $max);

			if ($this->id_exists($id) || in_array($id, $id_blacklist)) {
				continue;
			}

			return $id;
		}

		throw new \exceptions\PublicApiException("file/new_id-try-limit", "Failed to find unused ID after $max_tries tries");
	}

	function id_exists($id)
	{
		if (!$id) {
			return false;
		}

		$query = $this->db->select('id')
			->from('files')
			->where('id', $id)
			->limit(1)
			->get();

		return $query->num_rows() == 1;
	}

	function get_filedata($id)
	{
		return cache_function("filedatav2-$id", 300, function() use ($id) {
			$query = $this->db
				->select('files.id, hash, file_storage.id storage_id, filename, mimetype, files.date, user, filesize')
				->from('files')
				->join('file_storage', 'file_storage.id = files.file_storage_id')
				->where('files.id', $id)
				->limit(1)
				->get();

			if ($query->num_rows() > 0) {
				$data = $query->row_array();
				$data["data_id"] = $data["hash"]."-".$data["storage_id"];
				return $data;
			} else {
				return false;
			}
		});
	}

	// return the folder in which the file with $data_id is stored
	function folder($data_id) {
		return $this->upload_path.'/'.substr($data_id, 0, 3);
	}

	// Returns the full path to the file with $data_id
	function file($data_id) {
		return $this->folder($data_id).'/'.$data_id;
	}

	// Add a file to the DB
	function add_file($userid, $id, $filename, $storage_id)
	{
		$this->db->insert("files", array(
			"id" => $id,
			"filename" => $filename,
			"date" => time(),
			"user" => $userid,
			"file_storage_id" => $storage_id,
		));
	}

	function adopt($id)
	{
		$userid = $this->muser->get_userid();

		$this->db->set(array('user' => $userid ))
			->where('id', $id)
			->where('user', 0)
			->update('files');
		return $this->db->affected_rows();
	}

	// remove old/invalid/broken IDs
	public function valid_id($id)
	{
		$filedata = $this->get_filedata($id);

		if (!$filedata) {
			return false;
		}

		return $this->valid_filedata($filedata);
	}

	public function valid_filedata($filedata)
	{
		return \service\files::valid_id($filedata, $this->id_validation_config, $this, time());
	}

	public function file_exists($file)
	{
		return file_exists($file);
	}

	public function filemtime($file)
	{
		return filemtime($file);
	}

	public function filesize($file)
	{
		return filesize($file);
	}

	public function get_timeout($id)
	{
		$filedata = $this->get_filedata($id);
		$file = $this->file($filedata["data_id"]);

		if ($this->config->item("upload_max_age") == 0) {
			return -1;
		}

		if (filesize($file) > $this->config->item("small_upload_size")) {
			return $filedata["date"] + $this->config->item("upload_max_age");
		} else {
			return -1;
		}
	}

	public function get_timeout_string($id)
	{
		$timeout = $this->get_timeout($id);

		if ($timeout >= 0) {
			return date("r", $timeout);
		} else {
			return "unknown";
		}
	}

	private function unused_file($data_id)
	{
		list ($hash, $storage_id) = explode("-", $data_id);
		$query = $this->db->select('files.id')
			->from('files')
			->join('file_storage', 'file_storage.id = files.file_storage_id')
			->where('hash', $hash)
			->where('file_storage.id', $storage_id)
			->limit(1)
			->get();

		return $query->num_rows() == 0;
	}

	public function delete_by_user($userid)
	{
		$query = $this->db->select("id")
			->where("user", $userid)
			->get("files")->result_array();
		$ids = array_map(function ($a) {return $a['id'];}, $query);

		foreach ($ids as $id) {
			$this->delete_id($id);
		}
	}

	public function delete_id($id)
	{
		$filedata = $this->get_filedata($id);

		// Delete the file and all multipastes using it
		// Note that this does not delete all relations in multipaste_file_map
		// which is actually done by an SQL contraint.
		// TODO: make it work properly without the constraint
		$map = $this->db->select('url_id')
			->distinct()
			->from('multipaste_file_map')
			->join("multipaste", "multipaste.multipaste_id = multipaste_file_map.multipaste_id")
			->where('file_url_id', $id)
			->get()->result_array();

		$this->db->where('id', $id)
			->delete('files');
		delete_cache("filedata-$id");

		foreach ($map as $entry) {
			assert(!empty($entry['url_id']));
			$this->mmultipaste->delete_id($entry["url_id"]);
		}

		if ($this->id_exists($id))  {
			return false;
		}

		if ($filedata !== false) {
			assert(isset($filedata["data_id"]));
			if ($this->unused_file($filedata['data_id'])) {
				$this->delete_data_id($filedata['data_id']);
			}
		}
		return true;
	}

	public function delete_data_id($data_id)
	{
		list ($hash, $storage_id) = explode("-", $data_id);

		$this->db->where('id', $storage_id)
			->delete('file_storage');
		if (file_exists($this->file($data_id))) {
			unlink($this->file($data_id));
		}
		$dir = $this->folder($data_id);
		if (file_exists($dir)) {
			if (count(scandir($dir)) == 2) {
				rmdir($dir);
			}
		}
		delete_cache("{$data_id}_thumb_150");
	}

	public function get_owner($id)
	{
		return $this->db->select('user')
			->from('files')
			->where('id', $id)
			->get()->row_array()
			['user'];
	}

}

# vim: set noet: