ENHANCEMENT [file_link id=n] shortcode support for file links in HtmlEditorField

_config.php

@@ -49,6 +49,8 @@ Object::useCustomClass('Datetime',   'SS_Datetime', true);
  */
 define('MCE_ROOT', 'sapphire/thirdparty/tinymce/');
 
+ShortcodeParser::get('default')->register('file_link', array('File', 'link_shortcode_handler'));
+
 /**
  * The secret key that needs to be sent along with pings to /Email_BounceHandler
  *

filesystem/File.php

@@ -138,6 +138,43 @@ class File extends DataObject {
 	 */
 	protected static $cache_file_fields = null;
 
+	/**
+	 * Replace "[file_link id=n]" shortcode with an anchor tag or link to the file.
+	 * @param $arguments array Arguments to the shortcode
+	 * @param $content string Content of the returned link (optional)
+	 * @param $parser object Specify a parser to parse the content (see {@link ShortCodeParser})
+	 * @return string anchor HTML tag if content argument given, otherwise file path link
+	 */
+	public static function link_shortcode_handler($arguments, $content = null, $parser = null) {
+		if(!isset($arguments['id']) || !is_numeric($arguments['id'])) return;
+
+		if (
+			   !($record = DataObject::get_by_id('File', $arguments['id']))             // Get the file by ID.
+			&& !($record = DataObject::get_one('ErrorPage', '"ErrorCode" = \'404\''))   // Link to 404 page directly.
+		) {
+			return; // There were no suitable matches at all.
+		}
+
+		// build the HTML tag
+		if($content) {
+			// build some useful meta-data (file type and size) as data attributes
+			$attrs = ' ';
+			if($record instanceof File) {
+				foreach(array(
+					'class' => 'file',
+					'data-type' => $record->getExtension(),
+					'data-size' => $record->getSize()
+				) as $name => $value) {
+					$attrs .= sprintf('%s="%s" ', $name, $value);
+				}
+			}
+
+			return sprintf('<a href="%s"%s>%s</a>', $record->Link(), rtrim($attrs), $parser->parse($content));
+		} else {
+			return $record->Link();
+		}
+	}
+
 	/**
 	 * Find a File object by the given filename.
 	 * 
@@ -167,7 +204,7 @@ class File extends DataObject {
 		return Director::baseURL() . $this->RelativeLink();
 	}
 
-	function RelativeLink(){
+	function RelativeLink() {
 		return $this->Filename;
 	}
 

forms/HtmlEditorField.php

@@ -307,7 +307,7 @@ class HtmlEditorField_Toolbar extends RequestHandler {
 					$siteTree,
 					new TextField('external', _t('HtmlEditorField.URL', 'URL'), 'http://'),
 					new EmailField('email', _t('HtmlEditorField.EMAIL', 'Email address')),
-					new TreeDropdownField('file', _t('HtmlEditorField.FILE', 'File'), 'File', 'Filename', 'Title', true),
+					new TreeDropdownField('file', _t('HtmlEditorField.FILE', 'File'), 'File', 'ID', 'Title', true),
 					new TextField('Anchor', _t('HtmlEditorField.ANCHORVALUE', 'Anchor')),
 					new TextField('Description', _t('HtmlEditorField.LINKDESCR', 'Link description')),
 					new CheckboxField('TargetBlank', _t('HtmlEditorField.LINKOPENNEWWIN', 'Open link in a new window?')),

javascript/HtmlEditorField.js

@@ -379,7 +379,7 @@ ss.editorWrappers['default'] = ss.editorWrappers.tinyMCE;
 						break;
 					
 					case 'file':
-						href = this.find(':input[name=file]').val();
+						href = '[file_link id=' + this.find(':input[name=file]').val() + ']';
 						target = '_blank';
 						break;
 					
@@ -532,7 +532,7 @@ ss.editorWrappers['default'] = ss.editorWrappers.tinyMCE;
 					email: RegExp.$1,
 					Description: title
 				};
-			} else if(href.match(/^(assets\/.*)$/)) {
+			} else if(href.match(/^(assets\/.*)$/) || href.match(/^\[file_link\s*(?:%20)?id=([0-9]+)\]?(#.*)?$/)) {
 				return {
 					LinkType: 'file',
 					file: RegExp.$1,

tests/filesystem/FileTest.php

@@ -9,6 +9,38 @@ class FileTest extends SapphireTest {
 	
 	protected $extraDataObjects = array('FileTest_MyCustomFile');
 
+	public function testLinkShortcodeHandler() {
+		$testFile = $this->objFromFixture('File', 'asdf');
+		$errorPage = $this->objFromFixture('ErrorPage', '404');
+
+		$parser = new ShortcodeParser();
+		$parser->register('file_link', array('File', 'link_shortcode_handler'));
+
+		$fileShortcode = sprintf('[file_link id=%d]', $testFile->ID);
+		$fileEnclosed  = sprintf('[file_link id=%d]Example Content[/file_link]', $testFile->ID);
+
+		$fileShortcodeExpected = $testFile->Link();
+		$fileEnclosedExpected  = sprintf('<a href="%s" class="file" data-type="txt" data-size="977 KB">Example Content</a>', $testFile->Link());
+
+		$this->assertEquals($fileShortcodeExpected, $parser->parse($fileShortcode), 'Test that simple linking works.');
+		$this->assertEquals($fileEnclosedExpected, $parser->parse($fileEnclosed), 'Test enclosed content is linked.');
+
+		$testFile->delete();
+
+		$fileShortcode = '[file_link id="-1"]';
+		$fileEnclosed  = '[file_link id="-1"]Example Content[/file_link]';
+
+		$fileShortcodeExpected = $errorPage->Link();
+		$fileEnclosedExpected  = sprintf('<a href="%s">Example Content</a>', $errorPage->Link());
+
+		$this->assertEquals($fileShortcodeExpected, $parser->parse($fileShortcode), 'Test link to 404 page if no suitable matches.');
+		$this->assertEquals($fileEnclosedExpected, $parser->parse($fileEnclosed));
+
+		$this->assertEquals('', $parser->parse('[file_link]'), 'Test that invalid ID attributes are not parsed.');
+		$this->assertEquals('', $parser->parse('[file_link id="text"]'));
+		$this->assertEquals('', $parser->parse('[file_link]Example Content[/file_link]'));
+	}
+
 	function testCreateWithFilenameWithSubfolder() {
 		// Note: We can't use fixtures/setUp() for this, as we want to create the db record manually.
 		// Creating the folder is necessary to avoid having "Filename" overwritten by setName()/setRelativePath(),

tests/filesystem/FileTest.yml

@@ -28,3 +28,7 @@ File:
       Filename: assets/FileTest-folder1/File1.txt
       Name: File1.txt
       ParentID: =>Folder.folder1
+ErrorPage:
+    404:
+      Title: Page not Found
+      ErrorCode: 404