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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Extension\SecurePoll\Ballots; |
| 4 | |
| 5 | use InvalidArgumentException; |
| 6 | use Language; |
| 7 | use LogicException; |
| 8 | use MediaWiki\Extension\SecurePoll\Context; |
| 9 | use MediaWiki\Extension\SecurePoll\Entities\Election; |
| 10 | use MediaWiki\Extension\SecurePoll\Entities\Entity; |
| 11 | use MediaWiki\Extension\SecurePoll\Entities\Question; |
| 12 | use MediaWiki\Request\WebRequest; |
| 13 | use MediaWiki\Status\Status; |
| 14 | use MessageLocalizer; |
| 15 | |
| 16 | /** |
| 17 | * Parent class for ballot forms. This is the UI component of a voting method. |
| 18 | */ |
| 19 | abstract class Ballot { |
| 20 | /** @var Election */ |
| 21 | public $election; |
| 22 | /** @var Context */ |
| 23 | public $context; |
| 24 | /** @var string|null */ |
| 25 | public $currentVote; |
| 26 | /** @var true[]|null */ |
| 27 | public $prevErrorIds; |
| 28 | /** @var true[]|null */ |
| 29 | public $usedErrorIds; |
| 30 | /** @var BallotStatus|null */ |
| 31 | public $prevStatus; |
| 32 | /** @var WebRequest|null */ |
| 33 | private $request; |
| 34 | /** @var MessageLocalizer|null */ |
| 35 | private $messageLocalizer; |
| 36 | /** @var Language|null */ |
| 37 | private $userLang; |
| 38 | |
| 39 | /** @var string[] */ |
| 40 | public const BALLOT_TYPES = [ |
| 41 | 'approval' => ApprovalBallot::class, |
| 42 | 'preferential' => PreferentialBallot::class, |
| 43 | 'choose' => ChooseBallot::class, |
| 44 | 'radio-range' => RadioRangeBallot::class, |
| 45 | 'radio-range-comment' => RadioRangeCommentBallot::class, |
| 46 | 'stv' => STVBallot::class, |
| 47 | ]; |
| 48 | |
| 49 | /** |
| 50 | * Get a list of names of tallying methods, which may be used to produce a |
| 51 | * result from this ballot type. |
| 52 | * @return array |
| 53 | */ |
| 54 | public static function getTallyTypes() { |
| 55 | throw new LogicException( "Subclass must override ::getTallyTypes()" ); |
| 56 | } |
| 57 | |
| 58 | /** |
| 59 | * Return descriptors for any properties this type requires for poll |
| 60 | * creation, for the election, questions, and options. |
| 61 | * |
| 62 | * The returned array should have three keys, "election", "question", and |
| 63 | * "option", each mapping to an array of HTMLForm descriptors. |
| 64 | * |
| 65 | * The descriptors should have an additional key, "SecurePoll_type", with |
| 66 | * the value being "property" or "message". |
| 67 | * |
| 68 | * @return array |
| 69 | */ |
| 70 | public static function getCreateDescriptors() { |
| 71 | return [ |
| 72 | 'election' => [ |
| 73 | 'shuffle-questions' => [ |
| 74 | 'label-message' => 'securepoll-create-label-shuffle_questions', |
| 75 | 'type' => 'check', |
| 76 | 'hidelabel' => true, |
| 77 | 'SecurePoll_type' => 'property', |
| 78 | ], |
| 79 | 'shuffle-options' => [ |
| 80 | 'label-message' => 'securepoll-create-label-shuffle_options', |
| 81 | 'type' => 'check', |
| 82 | 'hidelabel' => true, |
| 83 | 'SecurePoll_type' => 'property', |
| 84 | ], |
| 85 | ], |
| 86 | 'question' => [], |
| 87 | 'option' => [], |
| 88 | ]; |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * Get the HTML form segment for a single question |
| 93 | * @param Question $question |
| 94 | * @param array $options Array of options, in the order they should be displayed |
| 95 | * @return \OOUI\FieldsetLayout |
| 96 | */ |
| 97 | abstract public function getQuestionForm( $question, $options ); |
| 98 | |
| 99 | /** |
| 100 | * Get any extra messages that this ballot type uses to render questions. |
| 101 | * Used to get the list of translatable messages for TranslatePage. |
| 102 | * @param Entity|null $entity |
| 103 | * @return array |
| 104 | * @see Election::getMessageNames() |
| 105 | */ |
| 106 | public function getMessageNames( Entity $entity = null ) { |
| 107 | return []; |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * Get the request if it has been set, otherwise throw an exception. |
| 112 | * |
| 113 | * @return WebRequest |
| 114 | */ |
| 115 | protected function getRequest(): WebRequest { |
| 116 | if ( !$this->request ) { |
| 117 | throw new LogicException( |
| 118 | 'Ballot::initRequest() must be called before Ballot::getRequest()' ); |
| 119 | } |
| 120 | return $this->request; |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * Get the MessageLocalizer if it has been set, otherwise throw an exception |
| 125 | * |
| 126 | * @return MessageLocalizer |
| 127 | */ |
| 128 | private function getMessageLocalizer(): MessageLocalizer { |
| 129 | if ( !$this->messageLocalizer ) { |
| 130 | throw new LogicException( |
| 131 | 'Ballot::initRequest() must be called before Ballot::getMessageLocalizer()' ); |
| 132 | } |
| 133 | return $this->messageLocalizer; |
| 134 | } |
| 135 | |
| 136 | /** |
| 137 | * Get a MediaWiki message. setMessageLocalizer() must have been called. |
| 138 | * |
| 139 | * This can be used instead of SecurePoll's native message system if the |
| 140 | * message does not vary depending on the election, and if there are no |
| 141 | * security concerns with allowing people who are not admins of the election |
| 142 | * to set the text. |
| 143 | * |
| 144 | * @param string $key |
| 145 | * @param mixed ...$params |
| 146 | * @return \Message |
| 147 | */ |
| 148 | protected function msg( $key, ...$params ) { |
| 149 | return $this->getMessageLocalizer()->msg( $key, ...$params ); |
| 150 | } |
| 151 | |
| 152 | /** |
| 153 | * Get the user language, or throw an exception if it has not been set. |
| 154 | * @return Language |
| 155 | */ |
| 156 | protected function getUserLang(): Language { |
| 157 | return $this->userLang; |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * Set request dependencies |
| 162 | * |
| 163 | * @param WebRequest $request |
| 164 | * @param MessageLocalizer $localizer |
| 165 | * @param Language $userLang |
| 166 | */ |
| 167 | public function initRequest( |
| 168 | WebRequest $request, |
| 169 | MessageLocalizer $localizer, |
| 170 | Language $userLang |
| 171 | ) { |
| 172 | $this->request = $request; |
| 173 | $this->messageLocalizer = $localizer; |
| 174 | $this->userLang = $userLang; |
| 175 | } |
| 176 | |
| 177 | /** |
| 178 | * Called when the form is submitted. This returns a Status object which, |
| 179 | * when successful, contains a voting record in the value member. To |
| 180 | * preserve voter privacy, voting records should be the same length |
| 181 | * regardless of voter choices. |
| 182 | * @return Status |
| 183 | */ |
| 184 | public function submitForm() { |
| 185 | $questions = $this->election->getQuestions(); |
| 186 | $record = ''; |
| 187 | $status = new BallotStatus(); |
| 188 | |
| 189 | foreach ( $questions as $question ) { |
| 190 | $record .= $this->submitQuestion( $question, $status ); |
| 191 | } |
| 192 | if ( $status->isOK() ) { |
| 193 | $status->value = $record; |
| 194 | } |
| 195 | |
| 196 | return $status; |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * Construct a string record for a given question, during form submission. |
| 201 | * |
| 202 | * If there is a problem with the form data, the function should set a |
| 203 | * fatal error in the $status object and return null. |
| 204 | * |
| 205 | * @param Question $question |
| 206 | * @param BallotStatus $status |
| 207 | * @return string|null |
| 208 | */ |
| 209 | abstract public function submitQuestion( $question, $status ); |
| 210 | |
| 211 | /** |
| 212 | * Unpack a string record into an array format suitable for the tally type |
| 213 | * @param string $record |
| 214 | * @return array|bool |
| 215 | */ |
| 216 | abstract public function unpackRecord( $record ); |
| 217 | |
| 218 | /** |
| 219 | * Convert a record to a string of some kind |
| 220 | * @param string $record |
| 221 | * @param array $options |
| 222 | * @return string[]|false |
| 223 | */ |
| 224 | public function convertRecord( $record, $options = [] ) { |
| 225 | $scores = $this->unpackRecord( $record ); |
| 226 | |
| 227 | return $this->convertScores( $scores ); |
| 228 | } |
| 229 | |
| 230 | /** |
| 231 | * Convert a score array to a string of some kind |
| 232 | * @param array $scores |
| 233 | * @param array $options |
| 234 | * @return string|string[]|false |
| 235 | */ |
| 236 | abstract public function convertScores( $scores, $options = [] ); |
| 237 | |
| 238 | /** |
| 239 | * Create a ballot of the given type |
| 240 | * @param Context $context |
| 241 | * @param string $type |
| 242 | * @param Election $election |
| 243 | * @return Ballot |
| 244 | * @throws InvalidArgumentException |
| 245 | */ |
| 246 | public static function factory( $context, $type, $election ) { |
| 247 | if ( !isset( self::BALLOT_TYPES[$type] ) ) { |
| 248 | throw new InvalidArgumentException( "Invalid ballot type: $type" ); |
| 249 | } |
| 250 | $class = self::BALLOT_TYPES[$type]; |
| 251 | |
| 252 | return new $class( $context, $election ); |
| 253 | } |
| 254 | |
| 255 | /** |
| 256 | * Constructor. |
| 257 | * @param Context $context |
| 258 | * @param Election $election |
| 259 | */ |
| 260 | public function __construct( $context, $election ) { |
| 261 | $this->context = $context; |
| 262 | $this->election = $election; |
| 263 | } |
| 264 | |
| 265 | /** |
| 266 | * Get the HTML for this ballot. <form> tags should not be included, |
| 267 | * they will be added by the VotePage. |
| 268 | * @param bool|BallotStatus $prevStatus |
| 269 | * @return \OOUI\Element[] |
| 270 | */ |
| 271 | public function getForm( $prevStatus = false ) { |
| 272 | $questions = $this->election->getQuestions(); |
| 273 | if ( $this->election->getProperty( 'shuffle-questions' ) ) { |
| 274 | shuffle( $questions ); |
| 275 | } |
| 276 | $shuffleOptions = $this->election->getProperty( 'shuffle-options' ); |
| 277 | $this->setErrorStatus( $prevStatus ); |
| 278 | |
| 279 | $itemArray = []; |
| 280 | foreach ( $questions as $question ) { |
| 281 | $options = $question->getOptions(); |
| 282 | if ( $shuffleOptions ) { |
| 283 | shuffle( $options ); |
| 284 | } |
| 285 | |
| 286 | $questionForm = $this->getQuestionForm( |
| 287 | $question, |
| 288 | $options |
| 289 | ); |
| 290 | $questionForm->setLabel( |
| 291 | new \OOUI\HtmlSnippet( $question->parseMessage( 'text' ) ) |
| 292 | ); |
| 293 | $itemArray[] = $questionForm; |
| 294 | } |
| 295 | if ( $prevStatus ) { |
| 296 | $formStatus = new \OOUI\Element( [ |
| 297 | 'content' => new \OOUI\HTMLSnippet( |
| 298 | $this->formatStatus( $prevStatus ) |
| 299 | ), |
| 300 | ] ); |
| 301 | array_unshift( $itemArray, $formStatus ); |
| 302 | } |
| 303 | |
| 304 | return $itemArray; |
| 305 | } |
| 306 | |
| 307 | /** |
| 308 | * @param bool|BallotStatus $status |
| 309 | */ |
| 310 | public function setErrorStatus( $status ) { |
| 311 | if ( $status ) { |
| 312 | $this->prevErrorIds = $status->getIds(); |
| 313 | $this->prevStatus = $status; |
| 314 | } else { |
| 315 | $this->prevErrorIds = []; |
| 316 | } |
| 317 | $this->usedErrorIds = []; |
| 318 | } |
| 319 | |
| 320 | public function errorLocationIndicator( $id ) { |
| 321 | if ( !isset( $this->prevErrorIds[$id] ) ) { |
| 322 | return ''; |
| 323 | } |
| 324 | $this->usedErrorIds[$id] = true; |
| 325 | |
| 326 | return new \OOUI\IconWidget( [ |
| 327 | 'icon' => 'error', |
| 328 | 'title' => $this->prevStatus->spGetMessageText( $id ), |
| 329 | 'id' => "$id-location", |
| 330 | 'classes' => [ 'securepoll-error-location' ], |
| 331 | 'flags' => 'error', |
| 332 | ] ); |
| 333 | } |
| 334 | |
| 335 | /** |
| 336 | * Convert a BallotStatus object to HTML |
| 337 | * @param BallotStatus $status |
| 338 | * @return string |
| 339 | */ |
| 340 | public function formatStatus( $status ) { |
| 341 | return $status->spGetHTML( $this->usedErrorIds ); |
| 342 | } |
| 343 | } |