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| 1 | <?php |
| 2 | |
| 3 | namespace MediaWiki\Extension\AbuseFilter\VariableGenerator; |
| 4 | |
| 5 | use MediaWiki\Extension\AbuseFilter\Hooks\AbuseFilterHookRunner; |
| 6 | use MediaWiki\Extension\AbuseFilter\Variables\VariableHolder; |
| 7 | use MediaWiki\Storage\PreparedUpdate; |
| 8 | use MediaWiki\Title\Title; |
| 9 | use MediaWiki\User\UserFactory; |
| 10 | use MediaWiki\User\UserIdentity; |
| 11 | use MediaWiki\Utils\MWTimestamp; |
| 12 | use RecentChange; |
| 13 | use WikiPage; |
| 14 | |
| 15 | /** |
| 16 | * Class used to generate variables, for instance related to a given user or title. |
| 17 | */ |
| 18 | class VariableGenerator { |
| 19 | /** |
| 20 | * @var VariableHolder |
| 21 | */ |
| 22 | protected $vars; |
| 23 | |
| 24 | /** @var AbuseFilterHookRunner */ |
| 25 | protected $hookRunner; |
| 26 | /** @var UserFactory */ |
| 27 | protected $userFactory; |
| 28 | |
| 29 | /** |
| 30 | * @param AbuseFilterHookRunner $hookRunner |
| 31 | * @param UserFactory $userFactory |
| 32 | * @param VariableHolder|null $vars |
| 33 | */ |
| 34 | public function __construct( |
| 35 | AbuseFilterHookRunner $hookRunner, |
| 36 | UserFactory $userFactory, |
| 37 | VariableHolder $vars = null |
| 38 | ) { |
| 39 | $this->hookRunner = $hookRunner; |
| 40 | $this->userFactory = $userFactory; |
| 41 | $this->vars = $vars ?? new VariableHolder(); |
| 42 | } |
| 43 | |
| 44 | /** |
| 45 | * @return VariableHolder |
| 46 | */ |
| 47 | public function getVariableHolder(): VariableHolder { |
| 48 | return $this->vars; |
| 49 | } |
| 50 | |
| 51 | /** |
| 52 | * Computes all variables unrelated to title and user. In general, these variables may be known |
| 53 | * even without an ongoing action. |
| 54 | * |
| 55 | * @param RecentChange|null $rc If the variables should be generated for an RC entry, |
| 56 | * this is the entry. Null if it's for the current action being filtered. |
| 57 | * @return $this For chaining |
| 58 | */ |
| 59 | public function addGenericVars( RecentChange $rc = null ): self { |
| 60 | $timestamp = $rc |
| 61 | ? MWTimestamp::convert( TS_UNIX, $rc->getAttribute( 'rc_timestamp' ) ) |
| 62 | : wfTimestamp( TS_UNIX ); |
| 63 | $this->vars->setVar( 'timestamp', $timestamp ); |
| 64 | // These are lazy-loaded just to reduce the amount of preset variables, but they |
| 65 | // shouldn't be expensive. |
| 66 | $this->vars->setLazyLoadVar( 'wiki_name', 'get-wiki-name', [] ); |
| 67 | $this->vars->setLazyLoadVar( 'wiki_language', 'get-wiki-language', [] ); |
| 68 | |
| 69 | $this->hookRunner->onAbuseFilter_generateGenericVars( $this->vars, $rc ); |
| 70 | return $this; |
| 71 | } |
| 72 | |
| 73 | /** |
| 74 | * @param UserIdentity $userIdentity |
| 75 | * @param RecentChange|null $rc If the variables should be generated for an RC entry, |
| 76 | * this is the entry. Null if it's for the current action being filtered. |
| 77 | * @return $this For chaining |
| 78 | */ |
| 79 | public function addUserVars( UserIdentity $userIdentity, RecentChange $rc = null ): self { |
| 80 | $asOf = $rc ? $rc->getAttribute( 'rc_timestamp' ) : wfTimestampNow(); |
| 81 | $user = $this->userFactory->newFromUserIdentity( $userIdentity ); |
| 82 | |
| 83 | $this->vars->setLazyLoadVar( |
| 84 | 'user_editcount', |
| 85 | 'user-editcount', |
| 86 | [ 'user-identity' => $userIdentity ] |
| 87 | ); |
| 88 | |
| 89 | $this->vars->setVar( 'user_name', $user->getName() ); |
| 90 | |
| 91 | $this->vars->setLazyLoadVar( |
| 92 | 'user_type', |
| 93 | 'user-type', |
| 94 | [ 'user-identity' => $userIdentity ] |
| 95 | ); |
| 96 | |
| 97 | $this->vars->setLazyLoadVar( |
| 98 | 'user_emailconfirm', |
| 99 | 'user-emailconfirm', |
| 100 | [ 'user' => $user ] |
| 101 | ); |
| 102 | |
| 103 | $this->vars->setLazyLoadVar( |
| 104 | 'user_age', |
| 105 | 'user-age', |
| 106 | [ 'user' => $user, 'asof' => $asOf ] |
| 107 | ); |
| 108 | |
| 109 | $this->vars->setLazyLoadVar( |
| 110 | 'user_groups', |
| 111 | 'user-groups', |
| 112 | [ 'user-identity' => $userIdentity ] |
| 113 | ); |
| 114 | |
| 115 | $this->vars->setLazyLoadVar( |
| 116 | 'user_rights', |
| 117 | 'user-rights', |
| 118 | [ 'user-identity' => $userIdentity ] |
| 119 | ); |
| 120 | |
| 121 | $this->vars->setLazyLoadVar( |
| 122 | 'user_blocked', |
| 123 | 'user-block', |
| 124 | [ 'user' => $user ] |
| 125 | ); |
| 126 | |
| 127 | $this->hookRunner->onAbuseFilter_generateUserVars( $this->vars, $user, $rc ); |
| 128 | |
| 129 | return $this; |
| 130 | } |
| 131 | |
| 132 | /** |
| 133 | * @param Title $title |
| 134 | * @param string $prefix |
| 135 | * @param RecentChange|null $rc If the variables should be generated for an RC entry, |
| 136 | * this is the entry. Null if it's for the current action being filtered. |
| 137 | * @return $this For chaining |
| 138 | */ |
| 139 | public function addTitleVars( |
| 140 | Title $title, |
| 141 | string $prefix, |
| 142 | RecentChange $rc = null |
| 143 | ): self { |
| 144 | if ( $rc && $rc->getAttribute( 'rc_type' ) == RC_NEW ) { |
| 145 | $this->vars->setVar( $prefix . '_id', 0 ); |
| 146 | } else { |
| 147 | $this->vars->setVar( $prefix . '_id', $title->getArticleID() ); |
| 148 | } |
| 149 | $this->vars->setVar( $prefix . '_namespace', $title->getNamespace() ); |
| 150 | $this->vars->setVar( $prefix . '_title', $title->getText() ); |
| 151 | $this->vars->setVar( $prefix . '_prefixedtitle', $title->getPrefixedText() ); |
| 152 | |
| 153 | // We only support the default values in $wgRestrictionTypes. Custom restrictions wouldn't |
| 154 | // have i18n messages. If a restriction is not enabled we'll just return the empty array. |
| 155 | $types = [ 'edit', 'move', 'create', 'upload' ]; |
| 156 | foreach ( $types as $action ) { |
| 157 | $this->vars->setLazyLoadVar( |
| 158 | "{$prefix}_restrictions_$action", |
| 159 | 'get-page-restrictions', |
| 160 | [ 'title' => $title, 'action' => $action ] |
| 161 | ); |
| 162 | } |
| 163 | |
| 164 | $asOf = $rc ? $rc->getAttribute( 'rc_timestamp' ) : wfTimestampNow(); |
| 165 | |
| 166 | // TODO: add 'asof' to this as well |
| 167 | $this->vars->setLazyLoadVar( |
| 168 | "{$prefix}_recent_contributors", |
| 169 | 'load-recent-authors', |
| 170 | [ 'title' => $title ] |
| 171 | ); |
| 172 | |
| 173 | $this->vars->setLazyLoadVar( |
| 174 | "{$prefix}_age", |
| 175 | 'page-age', |
| 176 | [ 'title' => $title, 'asof' => $asOf ] |
| 177 | ); |
| 178 | |
| 179 | $this->vars->setLazyLoadVar( |
| 180 | "{$prefix}_first_contributor", |
| 181 | 'load-first-author', |
| 182 | [ 'title' => $title ] |
| 183 | ); |
| 184 | |
| 185 | $this->hookRunner->onAbuseFilter_generateTitleVars( $this->vars, $title, $prefix, $rc ); |
| 186 | |
| 187 | return $this; |
| 188 | } |
| 189 | |
| 190 | public function addDerivedEditVars(): self { |
| 191 | $this->vars->setLazyLoadVar( 'edit_diff', 'diff', |
| 192 | [ 'oldtext-var' => 'old_wikitext', 'newtext-var' => 'new_wikitext' ] ); |
| 193 | $this->vars->setLazyLoadVar( 'edit_diff_pst', 'diff', |
| 194 | [ 'oldtext-var' => 'old_wikitext', 'newtext-var' => 'new_pst' ] ); |
| 195 | $this->vars->setLazyLoadVar( 'new_size', 'length', [ 'length-var' => 'new_wikitext' ] ); |
| 196 | $this->vars->setLazyLoadVar( 'old_size', 'length', [ 'length-var' => 'old_wikitext' ] ); |
| 197 | $this->vars->setLazyLoadVar( 'edit_delta', 'subtract-int', |
| 198 | [ 'val1-var' => 'new_size', 'val2-var' => 'old_size' ] ); |
| 199 | |
| 200 | // Some more specific/useful details about the changes. |
| 201 | $this->vars->setLazyLoadVar( 'added_lines', 'diff-split', |
| 202 | [ 'diff-var' => 'edit_diff', 'line-prefix' => '+' ] ); |
| 203 | $this->vars->setLazyLoadVar( 'removed_lines', 'diff-split', |
| 204 | [ 'diff-var' => 'edit_diff', 'line-prefix' => '-' ] ); |
| 205 | $this->vars->setLazyLoadVar( 'added_lines_pst', 'diff-split', |
| 206 | [ 'diff-var' => 'edit_diff_pst', 'line-prefix' => '+' ] ); |
| 207 | |
| 208 | // Links |
| 209 | $this->vars->setLazyLoadVar( 'added_links', 'link-diff-added', |
| 210 | [ 'oldlink-var' => 'old_links', 'newlink-var' => 'all_links' ] ); |
| 211 | $this->vars->setLazyLoadVar( 'removed_links', 'link-diff-removed', |
| 212 | [ 'oldlink-var' => 'old_links', 'newlink-var' => 'all_links' ] ); |
| 213 | |
| 214 | // Text |
| 215 | $this->vars->setLazyLoadVar( 'new_text', 'strip-html', |
| 216 | [ 'html-var' => 'new_html' ] ); |
| 217 | |
| 218 | return $this; |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * @param WikiPage $page |
| 223 | * @param UserIdentity $userIdentity The current user |
| 224 | * @param bool $forFilter Whether the variables should be computed for an ongoing action |
| 225 | * being filtered |
| 226 | * @param PreparedUpdate|null $update |
| 227 | * @return $this For chaining |
| 228 | */ |
| 229 | public function addEditVars( |
| 230 | WikiPage $page, |
| 231 | UserIdentity $userIdentity, |
| 232 | bool $forFilter = true, |
| 233 | PreparedUpdate $update = null |
| 234 | ): self { |
| 235 | $this->addDerivedEditVars(); |
| 236 | |
| 237 | if ( $forFilter && $update ) { |
| 238 | $this->vars->setLazyLoadVar( 'all_links', 'links-from-update', |
| 239 | [ 'update' => $update ] ); |
| 240 | } else { |
| 241 | $this->vars->setLazyLoadVar( 'all_links', 'links-from-wikitext', |
| 242 | [ |
| 243 | 'text-var' => 'new_wikitext', |
| 244 | 'article' => $page, |
| 245 | 'forFilter' => $forFilter, |
| 246 | 'contextUserIdentity' => $userIdentity |
| 247 | ] ); |
| 248 | } |
| 249 | |
| 250 | if ( $forFilter ) { |
| 251 | $this->vars->setLazyLoadVar( 'old_links', 'links-from-database', |
| 252 | [ 'article' => $page ] ); |
| 253 | } else { |
| 254 | $this->vars->setLazyLoadVar( 'old_links', 'links-from-wikitext-or-database', |
| 255 | [ |
| 256 | 'article' => $page, |
| 257 | 'text-var' => 'old_wikitext', |
| 258 | 'contextUserIdentity' => $userIdentity |
| 259 | ] ); |
| 260 | } |
| 261 | |
| 262 | // TODO: the following should use PreparedUpdate, too |
| 263 | $this->vars->setLazyLoadVar( 'new_pst', 'parse-wikitext', |
| 264 | [ |
| 265 | 'wikitext-var' => 'new_wikitext', |
| 266 | 'article' => $page, |
| 267 | 'pst' => true, |
| 268 | 'contextUserIdentity' => $userIdentity |
| 269 | ] ); |
| 270 | |
| 271 | if ( $forFilter && $update ) { |
| 272 | $this->vars->setLazyLoadVar( 'new_html', 'html-from-update', |
| 273 | [ 'update' => $update ] ); |
| 274 | } else { |
| 275 | $this->vars->setLazyLoadVar( 'new_html', 'parse-wikitext', |
| 276 | [ |
| 277 | 'wikitext-var' => 'new_wikitext', |
| 278 | 'article' => $page, |
| 279 | 'contextUserIdentity' => $userIdentity |
| 280 | ] ); |
| 281 | } |
| 282 | |
| 283 | return $this; |
| 284 | } |
| 285 | } |