imagepage.php

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<?php
/**
 * @package MediaWiki
 */

/**
 *
 */
if( !defined( 'MEDIAWIKI' ) )
	die( 1 );

require_once( 'Image.php' );

/**
 * Special handling for image description pages
 * @package MediaWiki
 */
class ImagePage extends Article {

	/* private */ var $img;  // Image object this page is shown for
	var $mExtraDescription = false;

	/**
	 * Handler for action=render
	 * Include body text only; none of the image extras
	 */
	function render() {
		global $wgOut;
		$wgOut->setArticleBodyOnly( true );
		$wgOut->addSecondaryWikitext( $this->getContent() );
	}

	function view() {
		global $wgOut, $wgShowEXIF;

		$this->img = new Image( $this->mTitle );

		if( $this->mTitle->getNamespace() == NS_IMAGE  ) {
			if ($wgShowEXIF && $this->img->exists()) {
				$exif = $this->img->getExifData();
				$showmeta = count($exif) ? true : false;
			} else {
				$exif = false;
				$showmeta = false;
			}

			if ($this->img->exists())
				$wgOut->addHTML($this->showTOC($showmeta));

			$this->openShowImage();

			# No need to display noarticletext, we use our own message, output in openShowImage()
			if( $this->getID() ) {
				Article::view();
			} else {
				# Just need to set the right headers
				$wgOut->setArticleFlag( true );
				$wgOut->setRobotpolicy( 'index,follow' );
				$wgOut->setPageTitle( $this->mTitle->getPrefixedText() );
				$this->viewUpdates();
			}

			# Show shared description, if needed
			if( $this->mExtraDescription ) {
				$fol = wfMsg( 'shareddescriptionfollows' );
				if( $fol != '-' ) {
					$wgOut->addWikiText( $fol );
				}
				$wgOut->addHTML( '<div id="shared-image-desc">' . $this->mExtraDescription . '</div>' );
			}

			$this->closeShowImage();
			$this->imageHistory();
			$this->imageLinks();
			if( $exif ) {
				global $wgStylePath;
				$expand = htmlspecialchars( wfEscapeJsString( wfMsg( 'metadata-expand' ) ) );
				$collapse = htmlspecialchars( wfEscapeJsString( wfMsg( 'metadata-collapse' ) ) );
				$wgOut->addHTML( "<h2 id=\"metadata\">" . wfMsgHtml( 'metadata' ) . "</h2>\n" );
				$wgOut->addWikiText( $this->makeMetadataTable( $exif ) );
				$wgOut->addHTML(
					"<script type=\"text/javascript\" src=\"$wgStylePath/common/metadata.js\"></script>\n" .
					"<script type=\"text/javascript\">attachMetadataToggle('mw_metadata', '$expand', '$collapse');</script>\n" );
			}
		} else {
			Article::view();
		}
	}

	/**
	 * Create the TOC
	 *
	 * @access private
	 *
	 * @param bool $metadata Whether or not to show the metadata link
	 * @return string
	 */
	function showTOC( $metadata ) {
		global $wgLang;
		$r = '<ul id="filetoc">
			<li><a href="#file">' . $wgLang->getNsText( NS_IMAGE ) . '</a></li>
			<li><a href="#filehistory">' . wfMsgHtml( 'imghistory' ) . '</a></li>
			<li><a href="#filelinks">' . wfMsgHtml( 'imagelinks' ) . '</a></li>' .
			($metadata ? '<li><a href="#metadata">' . wfMsgHtml( 'metadata' ) . '</a></li>' : '') . '
		</ul>';
		return $r;
	}

	/**
	 * Make a table with metadata to be shown in the output page.
	 *
	 * @access private
	 *
	 * @param array $exif The array containing the EXIF data
	 * @return string
	 */
	function makeMetadataTable( $exif ) {
		$r = wfMsg( 'metadata-help' ) . "\n\n";
		$r .= "{| id=mw_metadata class=mw_metadata\n";
		$visibleFields = $this->visibleMetadataFields();
		foreach( $exif as $k => $v ) {
			$tag = strtolower( $k );
			$msg = wfMsg( "exif-$tag" );
			$class = "exif-$tag";
			if( !in_array( $tag, $visibleFields ) ) {
				$class .= ' collapsable';
			}
			$r .= "|- class=\"$class\"\n";
			$r .= "!| $msg\n";
			$r .= "|| $v\n";
		}
		$r .= '|}';
		return $r;
	}

	/**
	 * Get a list of EXIF metadata items which should be displayed when
	 * the metadata table is collapsed.
	 *
	 * @return array of strings
	 * @access private
	 */
	function visibleMetadataFields() {
		$fields = array();
		$lines = explode( "\n", wfMsgForContent( 'metadata-fields' ) );
		foreach( $lines as $line ) {
			if( preg_match( '/^\\*\s*(.*?)\s*$/', $line, $matches ) ) {
				$fields[] = $matches[1];
			}
		}
		return $fields;
	}

	/**
	 * Overloading Article's getContent method.
	 * 
	 * Omit noarticletext if sharedupload; text will be fetched from the
	 * shared upload server if possible.
	 */
	function getContent() {
		if( $this->img && $this->img->fromSharedDirectory && 0 == $this->getID() ) {
			return '';
		}
		return Article::getContent();
	}

	function openShowImage() {
		global $wgOut, $wgUser, $wgImageLimits, $wgRequest;
		global $wgUseImageResize, $wgGenerateThumbnailOnParse;

		$full_url  = $this->img->getURL();
		$anchoropen = '';
		$anchorclose = '';

		if( $wgUser->getOption( 'imagesize' ) == '' ) {
			$sizeSel = User::getDefaultOption( 'imagesize' );
		} else {
			$sizeSel = intval( $wgUser->getOption( 'imagesize' ) );
		}
		if( !isset( $wgImageLimits[$sizeSel] ) ) {
			$sizeSel = User::getDefaultOption( 'imagesize' );
		}
		$max = $wgImageLimits[$sizeSel];
		$maxWidth = $max[0];
		$maxHeight = $max[1];
		$sk = $wgUser->getSkin();

		if ( $this->img->exists() ) {
			# image
			$width = $this->img->getWidth();
			$height = $this->img->getHeight();
			$showLink = false;

			if ( $this->img->allowInlineDisplay() and $width and $height) {
				# image

				# "Download high res version" link below the image
				$msg = wfMsgHtml('showbigimage', $width, $height, intval( $this->img->getSize()/1024 ) );

				# We'll show a thumbnail of this image
				if ( $width > $maxWidth || $height > $maxHeight ) {
					# Calculate the thumbnail size.
					# First case, the limiting factor is the width, not the height.
					if ( $width / $height >= $maxWidth / $maxHeight ) {
						$height = round( $height * $maxWidth / $width);
						$width = $maxWidth;
						# Note that $height <= $maxHeight now.
					} else {
						$newwidth = floor( $width * $maxHeight / $height);
						$height = round( $height * $newwidth / $width );
						$width = $newwidth;
						# Note that $height <= $maxHeight now, but might not be identical
						# because of rounding.
					}

					if( $wgUseImageResize ) {
						$thumbnail = $this->img->getThumbnail( $width, -1, $wgGenerateThumbnailOnParse );
						if ( $thumbnail == null ) {
							$url = $this->img->getViewURL();
						} else {
							$url = $thumbnail->getURL();
						}
					} else {
						# No resize ability? Show the full image, but scale
						# it down in the browser so it fits on the page.
						$url = $this->img->getViewURL();
					}
					$anchoropen  = "<a href=\"{$full_url}\">";
					$anchorclose = "</a><br />";
					if( $this->img->mustRender() ) {
						$showLink = true;
					} else {
						$anchorclose .= "\n$anchoropen{$msg}</a>";
					}
				} else {
					$url = $this->img->getViewURL();
					$showLink = true;
				}
				$wgOut->addHTML( '<div class="fullImageLink" id="file">' . $anchoropen .
				     "<img border=\"0\" src=\"{$url}\" width=\"{$width}\" height=\"{$height}\" alt=\"" .
				     htmlspecialchars( $wgRequest->getVal( 'image' ) ).'" />' . $anchorclose . '</div>' );
			} else {
				#if direct link is allowed but it's not a renderable image, show an icon.
				if ($this->img->isSafeFile()) {
					$icon= $this->img->iconThumb();

					$wgOut->addHTML( '<div class="fullImageLink" id="file"><a href="' . $full_url . '">' .
					$icon->toHtml() .
					'</a></div>' );
				}

				$showLink = true;
			}


			if ($showLink) {
				$filename = wfEscapeWikiText( $this->img->getName() );
				$info = wfMsg( 'fileinfo',
					ceil($this->img->getSize()/1024.0),
					$this->img->getMimeType() );

				global $wgContLang;
				$dirmark = $wgContLang->getDirMark();
				if (!$this->img->isSafeFile()) {
					$warning = wfMsg( 'mediawarning' );
					$wgOut->addWikiText( <<<END
<div class="fullMedia">
<span class="dangerousLink">[[Media:$filename|$filename]]</span>$dirmark
<span class="fileInfo"> ($info)</span>
</div>

<div class="mediaWarning">$warning</div>
END
						);
				} else {
					$wgOut->addWikiText( <<<END
<div class="fullMedia">
[[Media:$filename|$filename]]$dirmark <span class="fileInfo"> ($info)</span>
</div>
END
						);
				}
			}

			if($this->img->fromSharedDirectory) {
				$this->printSharedImageText();
			}
		} else {
			# Image does not exist

			$title = Title::makeTitle( NS_SPECIAL, 'Upload' );
			$link = $sk->makeKnownLinkObj($title, wfMsgHtml('noimage-linktext'),
				'wpDestFile=' . urlencode( $this->img->getName() ) );
			$wgOut->addHTML( wfMsgWikiHtml( 'noimage', $link ) );
		}
	}

	function printSharedImageText() {
		global $wgRepositoryBaseUrl, $wgFetchCommonsDescriptions, $wgOut, $wgUser;

		$url = $wgRepositoryBaseUrl . urlencode($this->mTitle->getDBkey());
		$sharedtext = "<div class='sharedUploadNotice'>" . wfMsgWikiHtml("sharedupload");
		if ($wgRepositoryBaseUrl && !$wgFetchCommonsDescriptions) {

			$sk = $wgUser->getSkin();
			$title = Title::makeTitle( NS_SPECIAL, 'Upload' );
			$link = $sk->makeKnownLinkObj($title, wfMsgHtml('shareduploadwiki-linktext'),
			array( 'wpDestFile' => urlencode( $this->img->getName() )));
			$sharedtext .= " " . wfMsgWikiHtml('shareduploadwiki', $link);
		}
		$sharedtext .= "</div>";
		$wgOut->addHTML($sharedtext);

		if ($wgRepositoryBaseUrl && $wgFetchCommonsDescriptions) {
			require_once("HttpFunctions.php");
			$ur = ini_set('allow_url_fopen', true);
			$text = wfGetHTTP($url . '?action=render');
			ini_set('allow_url_fopen', $ur);
			if ($text)
				$this->mExtraDescription = $text;
		}
	}

	function getUploadUrl() {
		global $wgServer;
		$uploadTitle = Title::makeTitle( NS_SPECIAL, 'Upload' );
		return $wgServer . $uploadTitle->getLocalUrl( 'wpDestFile=' . urlencode( $this->img->getName() ) );
	}

	/**
	 * Print out the various links at the bottom of the image page, e.g. reupload,
	 * external editing (and instructions link) etc.
	 */
	function uploadLinksBox() {
		global $wgUser, $wgOut;

		if( $this->img->fromSharedDirectory )
			return;

		$sk = $wgUser->getSkin();
		
		$wgOut->addHtml( '<br /><ul>' );
		
		# "Upload a new version of this file" link
		if( $wgUser->isAllowed( 'reupload' ) ) {
			$ulink = $sk->makeExternalLink( $this->getUploadUrl(), wfMsg( 'uploadnewversion-linktext' ) );
			$wgOut->addHtml( "<li><div>{$ulink}</div></li>" );
		}
		
		# External editing link
		$elink = $sk->makeKnownLinkObj( $this->mTitle, wfMsg( 'edit-externally' ), 'action=edit&externaledit=true&mode=file' );
		$wgOut->addHtml( '<li>' . $elink . '<div>' . wfMsgWikiHtml( 'edit-externally-help' ) . '</div></li>' );
		
		$wgOut->addHtml( '</ul>' );
	}

	function closeShowImage()
	{
		# For overloading

	}

	/**
	 * If the page we've just displayed is in the "Image" namespace,