1 files changed, 81 insertions, 0 deletions
diff --git a/includes/htmlform/HTMLTitleTextField.php b/includes/htmlform/HTMLTitleTextField.php
new file mode 100644
index 00000000..a225c67c
--- /dev/null
+++ b/includes/htmlform/HTMLTitleTextField.php
@@ -0,0 +1,81 @@
+<?php
+
+use MediaWiki\Widget\TitleInputWidget;
+
+/**
+ * Implements a text input field for page titles.
+ * Automatically does validation that the title is valid,
+ * as well as autocompletion if using the OOUI display format.
+ *
+ * Note: Forms using GET requests will need to make sure the title value is not
+ * an empty string.
+ *
+ * Optional parameters:
+ * 'namespace' - Namespace the page must be in
+ * 'relative' - If true and 'namespace' given, strip/add the namespace from/to the title as needed
+ * 'creatable' - Whether to validate the title is creatable (not a special page)
+ * 'exists' - Whether to validate that the title already exists
+ *
+ * @since 1.26
+ */
+class HTMLTitleTextField extends HTMLTextField {
+	public function __construct( $params ) {
+		$params += array(
+			'namespace' => false,
+			'relative' => false,
+			'creatable' => false,
+			'exists' => false,
+		);
+
+		parent::__construct( $params );
+	}
+
+	public function validate( $value, $alldata ) {
+		if ( $this->mParent->getMethod() === 'get' && $value === '' ) {
+			// If the form is a GET form and has no value, assume it hasn't been
+			// submitted yet, and skip validation
+			return parent::validate( $value, $alldata );
+		}
+		try {
+			if ( !$this->mParams['relative'] ) {
+				$title = Title::newFromTextThrow( $value );
+			} else {
+				// Can't use Title::makeTitleSafe(), because it doesn't throw useful exceptions
+				global $wgContLang;
+				$namespaceName = $wgContLang->getNsText( $this->mParams['namespace'] );
+				$title = Title::newFromTextThrow( $namespaceName . ':' . $value );
+			}
+		} catch ( MalformedTitleException $e ) {
+			$msg = $this->msg( $e->getErrorMessage() );
+			$params = $e->getErrorMessageParameters();
+			if ( $params ) {
+				$msg->params( $params );
+			}
+			return $msg->parse();
+		}
+
+		$text = $title->getPrefixedText();
+		if ( $this->mParams['namespace'] !== false && !$title->inNamespace( $this->mParams['namespace'] ) ) {
+			return $this->msg( 'htmlform-title-badnamespace', $this->mParams['namespace'], $text )->parse();
+		}
+
+		if ( $this->mParams['creatable'] && !$title->canExist() ) {
+			return $this->msg( 'htmlform-title-not-creatable', $text )->escaped();
+		}
+
+		if ( $this->mParams['exists'] && !$title->exists() ) {
+			return $this->msg( 'htmlform-title-not-exists', $text )->parse();
+		}
+
+		return parent::validate( $value, $alldata );
+	}
+
+	protected function getInputWidget( $params ) {
+		$this->mParent->getOutput()->addModules( 'mediawiki.widgets' );
+		if ( $this->mParams['namespace'] !== false ) {
+			$params['namespace'] = $this->mParams['namespace'];
+		}
+		$params['relative'] = $this->mParams['relative'];
+		return new TitleInputWidget( $params );
+	}
+}