chore(ckeditor5/plugins): add file-upload

Original commit: a440988df452ab4367f5288269ba3c05aa5e6b8e

_regroup/ckeditor5-file-upload/src/fileuploadcommand.js

@@ -0,0 +1,53 @@
+import { FileRepository } from 'ckeditor5/src/upload';
+import { Command } from 'ckeditor5/src/core';
+
+export default class FileUploadCommand extends Command {
+	refresh() {
+		this.isEnabled = true;
+	}
+
+	/**
+	 * Executes the command.
+	 *
+	 * @fires execute
+	 * @param {Object} options Options for the executed command.
+	 * @param {File|Array.<File>} options.file The file or an array of files to upload.
+	 */
+	execute( options ) {
+		const editor = this.editor;
+		const model = editor.model;
+
+		const fileRepository = editor.plugins.get( FileRepository );
+
+		model.change( writer => {
+			const filesToUpload = options.file;
+			for ( const file of filesToUpload ) {
+				uploadFile( writer, model, fileRepository, file );
+			}
+		} );
+	}
+}
+
+/**
+ * 	Handles uploading single file.
+ *
+ *	@param {module:engine/model/writer~writer} writer
+ *	@param {module:engine/model/model~Model} model
+ *	@param {File} file
+ */
+function uploadFile( writer, model, fileRepository, file ) {
+	const loader = fileRepository.createLoader( file );
+
+	// Do not throw when upload adapter is not set. FileRepository will log an error anyway.
+	if ( !loader ) {
+		return;
+	}
+
+	insertFileLink( writer, model, { href: '', uploadId: loader.id }, file );
+}
+
+function insertFileLink( writer, model, attributes = {}, file ) {
+	const placeholder = writer.createElement( 'reference', attributes );
+	model.insertContent( placeholder, model.document.selection );
+	writer.insertText( ' ', placeholder, 'after' );
+}