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| 1 | <?php declare(strict_types=1); |
| 2 | /** |
| 3 | * PrivateBin |
| 4 | * |
| 5 | * a zero-knowledge paste bin |
| 6 | * |
| 7 | * @link https://github.com/PrivateBin/PrivateBin |
| 8 | * @copyright 2012 Sébastien SAUVAGE (sebsauvage.net) |
| 9 | * @license https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License |
| 10 | */ |
| 11 | |
| 12 | namespace PrivateBin\Model; |
| 13 | |
| 14 | use Exception; |
| 15 | use PrivateBin\Controller; |
| 16 | use PrivateBin\Persistence\ServerSalt; |
| 17 | |
| 18 | /** |
| 19 | * Paste |
| 20 | * |
| 21 | * Model of a PrivateBin paste. |
| 22 | */ |
| 23 | class Paste extends AbstractModel |
| 24 | { |
| 25 | /** |
| 26 | * Get paste data. |
| 27 | * |
| 28 | * @access public |
| 29 | * @throws Exception |
| 30 | * @return array |
| 31 | */ |
| 32 | public function get() |
| 33 | { |
| 34 | $data = $this->_store->read($this->getId()); |
| 35 | if ($data === false) { |
| 36 | throw new Exception(Controller::GENERIC_ERROR, 64); |
| 37 | } |
| 38 | |
| 39 | // check if paste has expired and delete it if necessary. |
| 40 | if (array_key_exists('expire_date', $data['meta'])) { |
| 41 | if ($data['meta']['expire_date'] < time()) { |
| 42 | $this->delete(); |
| 43 | throw new Exception(Controller::GENERIC_ERROR, 63); |
| 44 | } |
| 45 | // We kindly provide the remaining time before expiration (in seconds) |
| 46 | $data['meta']['time_to_live'] = $data['meta']['expire_date'] - time(); |
| 47 | unset($data['meta']['expire_date']); |
| 48 | } |
| 49 | foreach (array('created', 'postdate') as $key) { |
| 50 | if (array_key_exists($key, $data['meta'])) { |
| 51 | unset($data['meta'][$key]); |
| 52 | } |
| 53 | } |
| 54 | |
| 55 | // check if non-expired burn after reading paste needs to be deleted |
| 56 | if ( |
| 57 | (array_key_exists('adata', $data) && $data['adata'][3] === 1) || |
| 58 | (array_key_exists('burnafterreading', $data['meta']) && $data['meta']['burnafterreading']) |
| 59 | ) { |
| 60 | $this->delete(); |
| 61 | } |
| 62 | |
| 63 | // set formatter for the view in version 1 pastes. |
| 64 | if (array_key_exists('data', $data) && !array_key_exists('formatter', $data['meta'])) { |
| 65 | // support < 0.21 syntax highlighting |
| 66 | if (array_key_exists('syntaxcoloring', $data['meta']) && $data['meta']['syntaxcoloring'] === true) { |
| 67 | $data['meta']['formatter'] = 'syntaxhighlighting'; |
| 68 | } else { |
| 69 | $data['meta']['formatter'] = $this->_conf->getKey('defaultformatter'); |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | // support old paste format with server wide salt |
| 74 | if (!array_key_exists('salt', $data['meta'])) { |
| 75 | $data['meta']['salt'] = ServerSalt::get(); |
| 76 | } |
| 77 | $data['comments'] = array_values($this->getComments()); |
| 78 | $data['comment_count'] = count($data['comments']); |
| 79 | $data['comment_offset'] = 0; |
| 80 | $data['@context'] = '?jsonld=paste'; |
| 81 | $this->_data = $data; |
| 82 | |
| 83 | return $this->_data; |
| 84 | } |
| 85 | |
| 86 | /** |
| 87 | * Store the paste's data. |
| 88 | * |
| 89 | * @access public |
| 90 | * @throws Exception |
| 91 | */ |
| 92 | public function store() |
| 93 | { |
| 94 | // Check for improbable collision. |
| 95 | if ($this->exists()) { |
| 96 | throw new Exception('You are unlucky. Try again.', 75); |
| 97 | } |
| 98 | |
| 99 | $this->_data['meta']['salt'] = ServerSalt::generate(); |
| 100 | |
| 101 | // store paste |
| 102 | if ( |
| 103 | $this->_store->create( |
| 104 | $this->getId(), |
| 105 | $this->_data |
| 106 | ) === false |
| 107 | ) { |
| 108 | throw new Exception('Error saving paste. Sorry.', 76); |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Delete the paste. |
| 114 | * |
| 115 | * @access public |
| 116 | * @throws Exception |
| 117 | */ |
| 118 | public function delete() |
| 119 | { |
| 120 | $this->_store->delete($this->getId()); |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * Test if paste exists in store. |
| 125 | * |
| 126 | * @access public |
| 127 | * @return bool |
| 128 | */ |
| 129 | public function exists() |
| 130 | { |
| 131 | return $this->_store->exists($this->getId()); |
| 132 | } |
| 133 | |
| 134 | /** |
| 135 | * Get a comment, optionally a specific instance. |
| 136 | * |
| 137 | * @access public |
| 138 | * @param string $parentId |
| 139 | * @param string $commentId |
| 140 | * @throws Exception |
| 141 | * @return Comment |
| 142 | */ |
| 143 | public function getComment($parentId, $commentId = '') |
| 144 | { |
| 145 | if (!$this->exists()) { |
| 146 | throw new Exception('Invalid data.', 62); |
| 147 | } |
| 148 | $comment = new Comment($this->_conf, $this->_store); |
| 149 | $comment->setPaste($this); |
| 150 | $comment->setParentId($parentId); |
| 151 | if ($commentId !== '') { |
| 152 | $comment->setId($commentId); |
| 153 | } |
| 154 | return $comment; |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * Get all comments, if any. |
| 159 | * |
| 160 | * @access public |
| 161 | * @return array |
| 162 | */ |
| 163 | public function getComments() |
| 164 | { |
| 165 | if ($this->_conf->getKey('discussiondatedisplay')) { |
| 166 | return $this->_store->readComments($this->getId()); |
| 167 | } |
| 168 | return array_map(function ($comment) { |
| 169 | foreach (array('created', 'postdate') as $key) { |
| 170 | if (array_key_exists($key, $comment['meta'])) { |
| 171 | unset($comment['meta'][$key]); |
| 172 | } |
| 173 | } |
| 174 | return $comment; |
| 175 | }, $this->_store->readComments($this->getId())); |
| 176 | } |
| 177 | |
| 178 | /** |
| 179 | * Generate the "delete" token. |
| 180 | * |
| 181 | * The token is the hmac of the pastes ID signed with the server salt. |
| 182 | * The paste can be deleted by calling: |
| 183 | * https://example.com/privatebin/?pasteid=<pasteid>&deletetoken=<deletetoken> |
| 184 | * |
| 185 | * @access public |
| 186 | * @return string |
| 187 | */ |
| 188 | public function getDeleteToken() |
| 189 | { |
| 190 | if (!array_key_exists('salt', $this->_data['meta'])) { |
| 191 | $this->get(); |
| 192 | } |
| 193 | return hash_hmac( |
| 194 | $this->_conf->getKey('zerobincompatibility') ? 'sha1' : 'sha256', |
| 195 | $this->getId(), |
| 196 | $this->_data['meta']['salt'] |
| 197 | ); |
| 198 | } |
| 199 | |
| 200 | /** |
| 201 | * Check if paste has discussions enabled. |
| 202 | * |
| 203 | * @access public |
| 204 | * @throws Exception |
| 205 | * @return bool |
| 206 | */ |
| 207 | public function isOpendiscussion() |
| 208 | { |
| 209 | if (!array_key_exists('adata', $this->_data) && !array_key_exists('data', $this->_data)) { |
| 210 | $this->get(); |
| 211 | } |
| 212 | return |
| 213 | (array_key_exists('adata', $this->_data) && $this->_data['adata'][2] === 1) || |
| 214 | (array_key_exists('opendiscussion', $this->_data['meta']) && $this->_data['meta']['opendiscussion']); |
| 215 | } |
| 216 | |
| 217 | /** |
| 218 | * Sanitizes data to conform with current configuration. |
| 219 | * |
| 220 | * @access protected |
| 221 | * @param array $data |
| 222 | * @return array |
| 223 | */ |
| 224 | protected function _sanitize(array $data) |
| 225 | { |
| 226 | $expiration = $data['meta']['expire']; |
| 227 | unset($data['meta']['expire']); |
| 228 | $expire_options = $this->_conf->getSection('expire_options'); |
| 229 | if (array_key_exists($expiration, $expire_options)) { |
| 230 | $expire = $expire_options[$expiration]; |
| 231 | } else { |
| 232 | // using getKey() to ensure a default value is present |
| 233 | $expire = $this->_conf->getKey($this->_conf->getKey('default', 'expire'), 'expire_options'); |
| 234 | } |
| 235 | if ($expire > 0) { |
| 236 | $data['meta']['expire_date'] = time() + $expire; |
| 237 | } |
| 238 | return $data; |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * Validate data. |
| 243 | * |
| 244 | * @access protected |
| 245 | * @param array $data |
| 246 | * @throws Exception |
| 247 | */ |
| 248 | protected function _validate(array $data) |
| 249 | { |
| 250 | // reject invalid or disabled formatters |
| 251 | if (!array_key_exists($data['adata'][1], $this->_conf->getSection('formatter_options'))) { |
| 252 | throw new Exception('Invalid data.', 75); |
| 253 | } |
| 254 | |
| 255 | // discussion requested, but disabled in config or burn after reading requested as well, or invalid integer |
| 256 | if ( |
| 257 | ($data['adata'][2] === 1 && ( // open discussion flag |
| 258 | !$this->_conf->getKey('discussion') || |
| 259 | $data['adata'][3] === 1 // burn after reading flag |
| 260 | )) || |
| 261 | ($data['adata'][2] !== 0 && $data['adata'][2] !== 1) |
| 262 | ) { |
| 263 | throw new Exception('Invalid data.', 74); |
| 264 | } |
| 265 | |
| 266 | // reject invalid burn after reading |
| 267 | if ($data['adata'][3] !== 0 && $data['adata'][3] !== 1) { |
| 268 | throw new Exception('Invalid data.', 73); |
| 269 | } |
| 270 | } |
| 271 | } |