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Merge pull request #248 from ckeditor/t/246

Feature: Support for uploading images with base64 source. Closes #246. Closes ckeditor/ckeditor5-paste-from-office#24.
Piotrek Koszuliński 7 лет назад
Родитель
Сommit
d90830f232

+ 95 - 28
packages/ckeditor5-image/src/imageupload/imageuploadediting.js

@@ -10,9 +10,11 @@
 import Plugin from '@ckeditor/ckeditor5-core/src/plugin';
 import FileRepository from '@ckeditor/ckeditor5-upload/src/filerepository';
 import Notification from '@ckeditor/ckeditor5-ui/src/notification/notification';
+import UpcastWriter from '@ckeditor/ckeditor5-engine/src/view/upcastwriter';
+import { upcastAttributeToAttribute } from '@ckeditor/ckeditor5-engine/src/conversion/upcast-converters';
 
 import ImageUploadCommand from '../../src/imageupload/imageuploadcommand';
-import { isImageType } from '../../src/imageupload/utils';
+import { isImageType, isLocalImage, fetchLocalImage } from '../../src/imageupload/utils';
 
 /**
  * The editing part of the image upload feature. It registers the `'imageUpload'` command.
@@ -34,6 +36,7 @@ export default class ImageUploadEditing extends Plugin {
 		const editor = this.editor;
 		const doc = editor.model.document;
 		const schema = editor.model.schema;
+		const conversion = editor.conversion;
 		const fileRepository = editor.plugins.get( FileRepository );
 
 		// Setup schema to allow uploadId and uploadStatus for images.
@@ -44,6 +47,16 @@ export default class ImageUploadEditing extends Plugin {
 		// Register imageUpload command.
 		editor.commands.add( 'imageUpload', new ImageUploadCommand( editor ) );
 
+		// Register upcast converter for uploadId.
+		conversion.for( 'upcast' )
+			.add( upcastAttributeToAttribute( {
+				view: {
+					name: 'img',
+					key: 'uploadId'
+				},
+				model: 'uploadId'
+			} ) );
+
 		// Handle pasted images.
 		// For every image file, a new file loader is created and a placeholder image is
 		// inserted into the content. Then, those images are uploaded once they appear in the model
@@ -81,6 +94,48 @@ export default class ImageUploadEditing extends Plugin {
 			} );
 		} );
 
+		// Handle HTML pasted with images with base64 or blob sources.
+		// For every image file, a new file loader is created and a placeholder image is
+		// inserted into the content. Then, those images are uploaded once they appear in the model
+		// (see Document#change listener below).
+		this.listenTo( editor.plugins.get( 'Clipboard' ), 'inputTransformation', ( evt, data ) => {
+			const fetchableImages = Array.from( editor.editing.view.createRangeIn( data.content ) )
+				.filter( value => isLocalImage( value.item ) && !value.item.getAttribute( 'uploadProcessed' ) )
+				.map( value => fetchLocalImage( value.item ) );
+
+			if ( !fetchableImages.length ) {
+				return;
+			}
+
+			evt.stop();
+
+			Promise.all( fetchableImages ).then( items => {
+				const writer = new UpcastWriter();
+
+				for ( const item of items ) {
+					if ( !item.file ) {
+						// Failed to fetch image or create a file instance, remove image element.
+						writer.remove( item.image );
+					} else {
+						// Set attribute marking the image as processed.
+						writer.setAttribute( 'uploadProcessed', true, item.image );
+
+						const loader = fileRepository.createLoader( item.file );
+
+						if ( loader ) {
+							writer.setAttribute( 'src', '', item.image );
+							writer.setAttribute( 'uploadId', loader.id, item.image );
+						}
+					}
+				}
+
+				editor.plugins.get( 'Clipboard' ).fire( 'inputTransformation', {
+					content: data.content,
+					dataTransfer: data.dataTransfer
+				} );
+			} );
+		} );
+
 		// Prevents from the browser redirecting to the dropped image.
 		editor.editing.view.document.on( 'dragover', ( evt, data ) => {
 			data.preventDefault();
@@ -163,33 +218,7 @@ export default class ImageUploadEditing extends Plugin {
 			.then( data => {
 				model.enqueueChange( 'transparent', writer => {
 					writer.setAttributes( { uploadStatus: 'complete', src: data.default }, imageElement );
-
-					// Srcset attribute for responsive images support.
-					let maxWidth = 0;
-					const srcsetAttribute = Object.keys( data )
-						// Filter out keys that are not integers.
-						.filter( key => {
-							const width = parseInt( key, 10 );
-
-							if ( !isNaN( width ) ) {
-								maxWidth = Math.max( maxWidth, width );
-
-								return true;
-							}
-						} )
-
-						// Convert each key to srcset entry.
-						.map( key => `${ data[ key ] } ${ key }w` )
-
-						// Join all entries.
-						.join( ', ' );
-
-					if ( srcsetAttribute != '' ) {
-						writer.setAttribute( 'srcset', {
-							data: srcsetAttribute,
-							width: maxWidth
-						}, imageElement );
-					}
+					this._parseAndSetSrcsetAttributeOnImage( data, imageElement, writer );
 				} );
 
 				clean();
@@ -226,6 +255,44 @@ export default class ImageUploadEditing extends Plugin {
 			fileRepository.destroyLoader( loader );
 		}
 	}
+
+	/**
+	 * Creates `srcset` attribute based on a given file upload response and sets it as an attribute to a specific image element.
+	 *
+	 * @protected
+	 * @param {Object} data Data object from which `srcset` will be created.
+	 * @param {module:engine/model/element~Element} image The image element on which `srcset` attribute will be set.
+	 * @param {module:engine/model/writer~Writer} writer
+	 */
+	_parseAndSetSrcsetAttributeOnImage( data, image, writer ) {
+		// Srcset attribute for responsive images support.
+		let maxWidth = 0;
+
+		const srcsetAttribute = Object.keys( data )
+			// Filter out keys that are not integers.
+			.filter( key => {
+				const width = parseInt( key, 10 );
+
+				if ( !isNaN( width ) ) {
+					maxWidth = Math.max( maxWidth, width );
+
+					return true;
+				}
+			} )
+
+			// Convert each key to srcset entry.
+			.map( key => `${ data[ key ] } ${ key }w` )
+
+			// Join all entries.
+			.join( ', ' );
+
+		if ( srcsetAttribute != '' ) {
+			writer.setAttribute( 'srcset', {
+				data: srcsetAttribute,
+				width: maxWidth
+			}, image );
+		}
+	}
 }
 
 // Returns `true` if non-empty `text/html` is included in the data transfer.

+ 79 - 0
packages/ckeditor5-image/src/imageupload/utils.js

@@ -7,6 +7,8 @@
  * @module image/imageupload/utils
  */
 
+/* global fetch, File */
+
 /**
  * Checks if a given file is an image.
  *
@@ -18,3 +20,80 @@ export function isImageType( file ) {
 
 	return types.test( file.type );
 }
+
+/**
+ * Creates a promise which fetches the image local source (base64 or blob) and returns as a `File` object.
+ *
+ * @param {module:engine/view/element~Element} image Image which source to fetch.
+ * @returns {Promise} A promise which resolves when image source is fetched and converted to `File` instance.
+ * It resolves with object holding initial image element (as `image`) and its file source (as `file`). If
+ * the `file` attribute is null, it means fetching failed.
+ */
+export function fetchLocalImage( image ) {
+	return new Promise( resolve => {
+		// Fetch works asynchronously and so does not block browser UI when processing data.
+		fetch( image.getAttribute( 'src' ) )
+			.then( resource => resource.blob() )
+			.then( blob => {
+				const mimeType = getImageMimeType( blob, image.getAttribute( 'src' ) );
+				const ext = mimeType.replace( 'image/', '' );
+				const filename = `image.${ ext }`;
+				const file = createFileFromBlob( blob, filename, mimeType );
+
+				resolve( { image, file } );
+			} )
+			.catch( () => {
+				// We always resolve a promise so `Promise.all` will not reject if one of many fetch fails.
+				resolve( { image, file: null } );
+			} );
+	} );
+}
+
+/**
+ * Checks whether given node is an image element with local source (base64 or blob).
+ *
+ * @param {module:engine/view/node~Node} node Node to check.
+ * @returns {Boolean}
+ */
+export function isLocalImage( node ) {
+	if ( !node.is( 'element', 'img' ) || !node.getAttribute( 'src' ) ) {
+		return false;
+	}
+
+	return node.getAttribute( 'src' ).match( /^data:image\/\w+;base64,/g ) ||
+		node.getAttribute( 'src' ).match( /^blob:/g );
+}
+
+// Extracts image type based on its blob representation or its source.
+//
+// @param {String} src Image src attribute value.
+// @param {Blob} blob Image blob representation.
+// @returns {String}
+function getImageMimeType( blob, src ) {
+	if ( blob.type ) {
+		return blob.type;
+	} else if ( src.match( /data:(image\/\w+);base64/ ) ) {
+		return src.match( /data:(image\/\w+);base64/ )[ 1 ].toLowerCase();
+	} else {
+		// Fallback to 'jpeg' as common extension.
+		return 'image/jpeg';
+	}
+}
+
+// Creates `File` instance from the given `Blob` instance using specified filename.
+//
+// @param {Blob} blob The `Blob` instance from which file will be created.
+// @param {String} filename Filename used during file creation.
+// @param {String} mimeType File mime type.
+// @returns {File|null} The `File` instance created from the given blob or `null` if `File API` is not available.
+function createFileFromBlob( blob, filename, mimeType ) {
+	try {
+		return new File( [ blob ], filename, { type: mimeType } );
+	} catch ( err ) {
+		// Edge does not support `File` constructor ATM, see https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/9551546/.
+		// However, the `File` function is present (so cannot be checked with `!window.File` or `typeof File === 'function'`), but
+		// calling it with `new File( ... )` throws an error. This try-catch prevents that. Also when the function will
+		// be implemented correctly in Edge the code will start working without any changes (see #247).
+		return null;
+	}
+}

+ 2 - 1
packages/ckeditor5-image/tests/imageupload.js

@@ -6,6 +6,7 @@
 /* globals document */
 
 import ClassicEditor from '@ckeditor/ckeditor5-editor-classic/src/classiceditor';
+import Clipboard from '@ckeditor/ckeditor5-clipboard/src/clipboard';
 import Image from '../src/image';
 import ImageUpload from '../src/imageupload';
 import ImageUploadEditing from '../src/imageupload/imageuploadediting';
@@ -23,7 +24,7 @@ describe( 'ImageUpload', () => {
 
 		return ClassicEditor
 			.create( editorElement, {
-				plugins: [ Image, ImageUpload, UploadAdapterPluginMock ]
+				plugins: [ Image, ImageUpload, UploadAdapterPluginMock, Clipboard ]
 			} )
 			.then( newEditor => {
 				editor = newEditor;

+ 318 - 10
packages/ckeditor5-image/tests/imageupload/imageuploadediting.js

@@ -3,7 +3,7 @@
  * For licensing, see LICENSE.md.
  */
 
-/* globals window, setTimeout */
+/* globals window, setTimeout, atob, URL, Blob */
 
 import VirtualTestEditor from '@ckeditor/ckeditor5-core/tests/_utils/virtualtesteditor';
 
@@ -30,7 +30,10 @@ import Notification from '@ckeditor/ckeditor5-ui/src/notification/notification';
 describe( 'ImageUploadEditing', () => {
 	// eslint-disable-next-line max-len
 	const base64Sample = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mNk+A8AAQUBAScY42YAAAAASUVORK5CYII=';
-	let editor, model, view, doc, fileRepository, viewDocument, nativeReaderMock, loader, adapterMock;
+	const isEdgeEnv = env.isEdge;
+
+	let adapterMocks = [];
+	let editor, model, view, doc, fileRepository, viewDocument, nativeReaderMock, loader;
 
 	testUtils.createSinonSandbox();
 
@@ -39,7 +42,9 @@ describe( 'ImageUploadEditing', () => {
 			fileRepository = this.editor.plugins.get( FileRepository );
 			fileRepository.createUploadAdapter = newLoader => {
 				loader = newLoader;
-				adapterMock = new UploadAdapterMock( loader );
+				const adapterMock = new UploadAdapterMock( loader );
+
+				adapterMocks.push( adapterMock );
 
 				return adapterMock;
 			};
@@ -47,6 +52,12 @@ describe( 'ImageUploadEditing', () => {
 	}
 
 	beforeEach( () => {
+		if ( isEdgeEnv ) {
+			testUtils.sinon.stub( window, 'File' ).callsFake( () => {
+				return { name: 'file.jpg' };
+			} );
+		}
+
 		// Most tests assume non-edge environment but we do not set `contenteditable=false` on Edge so stub `env.isEdge`.
 		testUtils.sinon.stub( env, 'isEdge' ).get( () => false );
 
@@ -58,7 +69,7 @@ describe( 'ImageUploadEditing', () => {
 
 		return VirtualTestEditor
 			.create( {
-				plugins: [ ImageEditing, ImageUploadEditing, Paragraph, UndoEditing, UploadAdapterPluginMock ]
+				plugins: [ ImageEditing, ImageUploadEditing, Paragraph, UndoEditing, UploadAdapterPluginMock, Clipboard ]
 			} )
 			.then( newEditor => {
 				editor = newEditor;
@@ -66,10 +77,15 @@ describe( 'ImageUploadEditing', () => {
 				doc = model.document;
 				view = editor.editing.view;
 				viewDocument = view.document;
+
+				// Stub `view.scrollToTheSelection` as it will fail on VirtualTestEditor without DOM.
+				testUtils.sinon.stub( view, 'scrollToTheSelection' ).callsFake( () => {} );
 			} );
 	} );
 
 	afterEach( () => {
+		adapterMocks = [];
+
 		return editor.destroy();
 	} );
 
@@ -185,7 +201,11 @@ describe( 'ImageUploadEditing', () => {
 			type: 'media/mp3',
 			size: 1024
 		};
-		const dataTransfer = new DataTransfer( { files: [ fileMock ], types: [ 'Files' ] } );
+		const dataTransfer = new DataTransfer( {
+			files: [ fileMock ],
+			types: [ 'Files' ],
+			getData: () => ''
+		} );
 
 		setModelData( model, '<paragraph>foo[]</paragraph>' );
 
@@ -199,7 +219,7 @@ describe( 'ImageUploadEditing', () => {
 
 	it( 'should not insert image when file is null', () => {
 		const viewDocument = editor.editing.view.document;
-		const dataTransfer = new DataTransfer( { files: [ null ], types: [ 'Files' ] } );
+		const dataTransfer = new DataTransfer( { files: [ null ], types: [ 'Files' ], getData: () => null } );
 
 		setModelData( model, '<paragraph>foo[]</paragraph>' );
 
@@ -225,7 +245,7 @@ describe( 'ImageUploadEditing', () => {
 
 		viewDocument.fire( 'clipboardInput', { dataTransfer, targetRanges: [ targetViewRange ] } );
 
-		expect( getModelData( model ) ).to.equal( '<paragraph>[]foo</paragraph>' );
+		expect( getModelData( model ) ).to.equal( '<paragraph>SomeData[]foo</paragraph>' );
 	} );
 
 	it( 'should not insert image nor crash when pasted image could not be inserted', () => {
@@ -289,7 +309,7 @@ describe( 'ImageUploadEditing', () => {
 		viewDocument.fire( 'clipboardInput', { dataTransfer, targetRanges: [ targetViewRange ] } );
 
 		// Well, there's no clipboard plugin, so nothing happens.
-		expect( getModelData( model ) ).to.equal( '<paragraph>[]foo</paragraph>' );
+		expect( getModelData( model ) ).to.equal( '<paragraph>SomeData[]foo</paragraph>' );
 	} );
 
 	it( 'should not convert image\'s uploadId attribute if is consumed already', () => {
@@ -340,7 +360,7 @@ describe( 'ImageUploadEditing', () => {
 				done();
 			}, { priority: 'lowest' } );
 
-			adapterMock.mockSuccess( { default: 'image.png' } );
+			adapterMocks[ 0 ].mockSuccess( { default: 'image.png' } );
 		} );
 
 		nativeReaderMock.mockSuccess( base64Sample );
@@ -547,7 +567,7 @@ describe( 'ImageUploadEditing', () => {
 				done();
 			}, { priority: 'lowest' } );
 
-			adapterMock.mockSuccess( { default: 'image.png', 500: 'image-500.png', 800: 'image-800.png' } );
+			adapterMocks[ 0 ].mockSuccess( { default: 'image.png', 500: 'image-500.png', 800: 'image-800.png' } );
 		} );
 
 		nativeReaderMock.mockSuccess( base64Sample );
@@ -562,4 +582,292 @@ describe( 'ImageUploadEditing', () => {
 
 		expect( spy.calledOnce ).to.equal( true );
 	} );
+
+	it( 'should upload image with base64 src', done => {
+		editor.plugins.get( 'Clipboard' ).on( 'inputTransformation', () => {
+			const id = adapterMocks[ 0 ].loader.id;
+			const expected = '<paragraph>bar</paragraph>' +
+				`[<image src="" uploadId="${ id }" uploadStatus="reading"></image>]` +
+				'<paragraph>foo</paragraph>';
+
+			expectModel( done, getModelData( model ), expected );
+		}, { priority: 'low' } );
+
+		setModelData( model, '<paragraph>[]foo</paragraph>' );
+
+		const clipboardHtml = `<p>bar</p><img src=${ base64Sample } />`;
+		const dataTransfer = mockDataTransfer( clipboardHtml );
+
+		const targetRange = model.createRange( model.createPositionAt( doc.getRoot(), 1 ), model.createPositionAt( doc.getRoot(), 1 ) );
+		const targetViewRange = editor.editing.mapper.toViewRange( targetRange );
+
+		viewDocument.fire( 'clipboardInput', { dataTransfer, targetRanges: [ targetViewRange ] } );
+	} );
+
+	it( 'should upload image with blob src', done => {
+		editor.plugins.get( 'Clipboard' ).on( 'inputTransformation', () => {
+			const id = adapterMocks[ 0 ].loader.id;
+			const expected = `[<image src="" uploadId="${ id }" uploadStatus="reading"></image>]` +
+				'<paragraph>foo</paragraph>';
+
+			expectModel( done, getModelData( model ), expected );
+		}, { priority: 'low' } );
+
+		setModelData( model, '<paragraph>[]foo</paragraph>' );
+
+		const clipboardHtml = `<img src=${ base64ToBlobUrl( base64Sample ) } />`;
+		const dataTransfer = mockDataTransfer( clipboardHtml );
+
+		const targetRange = model.createRange( model.createPositionAt( doc.getRoot(), 1 ), model.createPositionAt( doc.getRoot(), 1 ) );
+		const targetViewRange = editor.editing.mapper.toViewRange( targetRange );
+
+		viewDocument.fire( 'clipboardInput', { dataTransfer, targetRanges: [ targetViewRange ] } );
+	} );
+
+	it( 'should not upload image if no loader available', done => {
+		editor.plugins.get( 'Clipboard' ).on( 'inputTransformation', () => {
+			const expected = `[<image src="${ base64Sample }"></image>]<paragraph>foo</paragraph>`;
+
+			expectModel( done, getModelData( model ), expected );
+		}, { priority: 'low' } );
+
+		testUtils.sinon.stub( fileRepository, 'createLoader' ).callsFake( () => null );
+
+		setModelData( model, '<paragraph>[]foo</paragraph>' );
+
+		const clipboardHtml = `<img src=${ base64Sample } />`;
+		const dataTransfer = mockDataTransfer( clipboardHtml );
+
+		const targetRange = model.createRange( model.createPositionAt( doc.getRoot(), 1 ), model.createPositionAt( doc.getRoot(), 1 ) );
+		const targetViewRange = editor.editing.mapper.toViewRange( targetRange );
+
+		viewDocument.fire( 'clipboardInput', { dataTransfer, targetRanges: [ targetViewRange ] } );
+	} );
+
+	it( 'should not upload and remove image if fetch failed', done => {
+		editor.plugins.get( 'Clipboard' ).on( 'inputTransformation', () => {
+			const expected = '<paragraph>[]foo</paragraph>';
+
+			expectModel( done, getModelData( model ), expected );
+		}, { priority: 'low' } );
+
+		setModelData( model, '<paragraph>[]foo</paragraph>' );
+
+		const clipboardHtml = `<img src=${ base64Sample } />`;
+		const dataTransfer = mockDataTransfer( clipboardHtml );
+
+		const targetRange = model.createRange( model.createPositionAt( doc.getRoot(), 1 ), model.createPositionAt( doc.getRoot(), 1 ) );
+		const targetViewRange = editor.editing.mapper.toViewRange( targetRange );
+
+		// Stub `fetch` so it can be rejected.
+		testUtils.sinon.stub( window, 'fetch' ).callsFake( () => {
+			return new Promise( ( res, rej ) => rej() );
+		} );
+
+		viewDocument.fire( 'clipboardInput', { dataTransfer, targetRanges: [ targetViewRange ] } );
+	} );
+
+	it( 'should upload only images which were successfully fetched and remove failed ones', done => {
+		editor.plugins.get( 'Clipboard' ).on( 'inputTransformation', () => {
+			const expected = '<paragraph>bar</paragraph>' +
+				`<image src="" uploadId="${ adapterMocks[ 0 ].loader.id }" uploadStatus="reading"></image>` +
+				`[<image src="" uploadId="${ adapterMocks[ 1 ].loader.id }" uploadStatus="reading"></image>]` +
+				'<paragraph>foo</paragraph>';
+
+			expectModel( done, getModelData( model ), expected );
+		}, { priority: 'low' } );
+
+		setModelData( model, '<paragraph>[]foo</paragraph>' );
+
+		const clipboardHtml = `<p>bar</p><img src=${ base64Sample } />` +
+			`<img src=${ base64ToBlobUrl( base64Sample ) } /><img src=${ base64Sample } />`;
+		const dataTransfer = mockDataTransfer( clipboardHtml );
+
+		const targetRange = model.createRange( model.createPositionAt( doc.getRoot(), 1 ), model.createPositionAt( doc.getRoot(), 1 ) );
+		const targetViewRange = editor.editing.mapper.toViewRange( targetRange );
+
+		// Stub `fetch` in a way that 2 first calls are successful and 3rd fails.
+		let counter = 0;
+		const fetch = window.fetch;
+		testUtils.sinon.stub( window, 'fetch' ).callsFake( src => {
+			counter++;
+			if ( counter < 3 ) {
+				return fetch( src );
+			} else {
+				return new Promise( ( res, rej ) => rej() );
+			}
+		} );
+
+		viewDocument.fire( 'clipboardInput', { dataTransfer, targetRanges: [ targetViewRange ] } );
+	} );
+
+	it( 'should not upload and remove image when `File` constructor is not present', done => {
+		const fileFn = window.File;
+
+		window.File = undefined;
+
+		editor.plugins.get( 'Clipboard' ).on( 'inputTransformation', () => {
+			window.File = fileFn;
+
+			const expected = '<paragraph>baz[]foo</paragraph>';
+
+			expectModel( done, getModelData( model ), expected );
+		}, { priority: 'low' } );
+
+		setModelData( model, '<paragraph>[]foo</paragraph>' );
+
+		const clipboardHtml = `<img src=${ base64ToBlobUrl( base64Sample ) } /><p>baz</p>`;
+		const dataTransfer = mockDataTransfer( clipboardHtml );
+
+		const targetRange = model.createRange( model.createPositionAt( doc.getRoot(), 1 ), model.createPositionAt( doc.getRoot(), 1 ) );
+		const targetViewRange = editor.editing.mapper.toViewRange( targetRange );
+
+		viewDocument.fire( 'clipboardInput', { dataTransfer, targetRanges: [ targetViewRange ] } );
+	} );
+
+	it( 'should not upload and remove image when `File` constructor is not supported', done => {
+		const fileFn = window.File;
+
+		window.File = function() {
+			throw new Error( 'Function expected.' ); // Simulating Edge browser behaviour here.
+		};
+
+		editor.plugins.get( 'Clipboard' ).on( 'inputTransformation', () => {
+			window.File = fileFn;
+
+			const expected = '<paragraph>baz[]foo</paragraph>';
+
+			expectModel( done, getModelData( model ), expected );
+		}, { priority: 'low' } );
+
+		setModelData( model, '<paragraph>[]foo</paragraph>' );
+
+		const clipboardHtml = `<p>baz</p><img src=${ base64ToBlobUrl( base64Sample ) } />`;
+		const dataTransfer = mockDataTransfer( clipboardHtml );
+
+		const targetRange = model.createRange( model.createPositionAt( doc.getRoot(), 1 ), model.createPositionAt( doc.getRoot(), 1 ) );
+		const targetViewRange = editor.editing.mapper.toViewRange( targetRange );
+
+		viewDocument.fire( 'clipboardInput', { dataTransfer, targetRanges: [ targetViewRange ] } );
+	} );
+
+	// Skip this test on Edge as we mock `File` object there so there is no sense in testing it.
+	( isEdgeEnv ? it.skip : it )( 'should get file extension from base64 string', done => {
+		editor.plugins.get( 'Clipboard' ).on( 'inputTransformation', () => {
+			try {
+				expect( loader.file.name.split( '.' ).pop() ).to.equal( 'png' );
+				done();
+			} catch ( err ) {
+				done( err );
+			}
+		}, { priority: 'low' } );
+
+		setModelData( model, '<paragraph>[]foo</paragraph>' );
+
+		const clipboardHtml = `<img src=${ base64Sample } />`;
+		const dataTransfer = mockDataTransfer( clipboardHtml );
+
+		const targetRange = model.createRange( model.createPositionAt( doc.getRoot(), 1 ), model.createPositionAt( doc.getRoot(), 1 ) );
+		const targetViewRange = editor.editing.mapper.toViewRange( targetRange );
+
+		// Stub `fetch` to return custom blob without type.
+		testUtils.sinon.stub( window, 'fetch' ).callsFake( () => {
+			return new Promise( res => res( {
+				blob() {
+					return new Promise( res => res( new Blob( [ 'foo', 'bar' ] ) ) );
+				}
+			} ) );
+		} );
+
+		viewDocument.fire( 'clipboardInput', { dataTransfer, targetRanges: [ targetViewRange ] } );
+	} );
+
+	// Skip this test on Edge as we mock `File` object there so there is no sense in testing it.
+	( isEdgeEnv ? it.skip : it )( 'should use fallback file extension', done => {
+		editor.plugins.get( 'Clipboard' ).on( 'inputTransformation', () => {
+			try {
+				expect( loader.file.name.split( '.' ).pop() ).to.equal( 'jpeg' );
+				done();
+			} catch ( err ) {
+				done( err );
+			}
+		}, { priority: 'low' } );
+
+		setModelData( model, '<paragraph>[]foo</paragraph>' );
+
+		const clipboardHtml = `<img src=${ base64ToBlobUrl( base64Sample ) } />`;
+		const dataTransfer = mockDataTransfer( clipboardHtml );
+
+		const targetRange = model.createRange( model.createPositionAt( doc.getRoot(), 1 ), model.createPositionAt( doc.getRoot(), 1 ) );
+		const targetViewRange = editor.editing.mapper.toViewRange( targetRange );
+
+		// Stub `fetch` to return custom blob without type.
+		testUtils.sinon.stub( window, 'fetch' ).callsFake( () => {
+			return new Promise( res => res( {
+				blob() {
+					return new Promise( res => res( new Blob( [ 'foo', 'bar' ] ) ) );
+				}
+			} ) );
+		} );
+
+		viewDocument.fire( 'clipboardInput', { dataTransfer, targetRanges: [ targetViewRange ] } );
+	} );
 } );
+
+// Asserts actual and expected model data.
+// Note: Since this function is run inside a promise, all errors needs to be caught
+// and rethrow to be correctly processed by a testing framework.
+//
+// @param {function} done Callback function to be called when assertion is done.
+// @param {String} actual Actual model data.
+// @param {String} expected Expected model data.
+function expectModel( done, actual, expected ) {
+	try {
+		expect( actual ).to.equal( expected );
+		done();
+	} catch ( err ) {
+		done( err );
+	}
+}
+
+// Creates data transfer object with predefined data.
+//
+// @param {String} content The content returned as `text/html` when queried.
+// @returns {module:clipboard/datatransfer~DataTransfer} DataTransfer object.
+function mockDataTransfer( content ) {
+	return new DataTransfer( {
+		types: [ 'text/html' ],
+		getData: type => type === 'text/html' ? content : ''
+	} );
+}
+
+// Creates blob url from the given base64 data.
+//
+// @param {String} base64 The base64 string from which blob url will be generated.
+// @returns {String} Blob url.
+function base64ToBlobUrl( base64 ) {
+	return URL.createObjectURL( base64ToBlob( base64.trim() ) );
+}
+
+// Transforms base64 data into a blob object.
+//
+// @param {String} The base64 data to be transformed.
+// @returns {Blob} Blob object representing given base64 data.
+function base64ToBlob( base64Data ) {
+	const [ type, data ] = base64Data.split( ',' );
+	const byteCharacters = atob( data );
+	const byteArrays = [];
+
+	for ( let offset = 0; offset < byteCharacters.length; offset += 512 ) {
+		const slice = byteCharacters.slice( offset, offset + 512 );
+		const byteNumbers = new Array( slice.length );
+
+		for ( let i = 0; i < slice.length; i++ ) {
+			byteNumbers[ i ] = slice.charCodeAt( i );
+		}
+
+		byteArrays.push( new Uint8Array( byteNumbers ) );
+	}
+
+	return new Blob( byteArrays, { type } );
+}

+ 2 - 1
packages/ckeditor5-image/tests/imageupload/imageuploadprogress.js

@@ -13,6 +13,7 @@ import ImageUploadEditing from '../../src/imageupload/imageuploadediting';
 import ImageUploadProgress from '../../src/imageupload/imageuploadprogress';
 import Paragraph from '@ckeditor/ckeditor5-paragraph/src/paragraph';
 import FileRepository from '@ckeditor/ckeditor5-upload/src/filerepository';
+import Clipboard from '@ckeditor/ckeditor5-clipboard/src/clipboard';
 
 import { UploadAdapterMock, createNativeFileMock, NativeFileReaderMock } from '@ckeditor/ckeditor5-upload/tests/_utils/mocks';
 import { setData as setModelData } from '@ckeditor/ckeditor5-engine/src/dev-utils/model';
@@ -54,7 +55,7 @@ describe( 'ImageUploadProgress', () => {
 
 		return VirtualTestEditor
 			.create( {
-				plugins: [ ImageEditing, Paragraph, ImageUploadEditing, ImageUploadProgress, UploadAdapterPluginMock ]
+				plugins: [ ImageEditing, Paragraph, ImageUploadEditing, ImageUploadProgress, UploadAdapterPluginMock, Clipboard ]
 			} )
 			.then( newEditor => {
 				editor = newEditor;

+ 2 - 1
packages/ckeditor5-image/tests/imageupload/imageuploadui.js

@@ -15,6 +15,7 @@ import ImageUploadUI from '../../src/imageupload/imageuploadui';
 import ImageUploadEditing from '../../src/imageupload/imageuploadediting';
 import Paragraph from '@ckeditor/ckeditor5-paragraph/src/paragraph';
 import Notification from '@ckeditor/ckeditor5-ui/src/notification/notification';
+import Clipboard from '@ckeditor/ckeditor5-clipboard/src/clipboard';
 
 import { createNativeFileMock, UploadAdapterMock } from '@ckeditor/ckeditor5-upload/tests/_utils/mocks';
 import { setData as setModelData, getData as getModelData } from '@ckeditor/ckeditor5-engine/src/dev-utils/model';
@@ -37,7 +38,7 @@ describe( 'ImageUploadUI', () => {
 
 		return ClassicEditor
 			.create( editorElement, {
-				plugins: [ Paragraph, Image, ImageUploadEditing, ImageUploadUI, FileRepository, UploadAdapterPluginMock ]
+				plugins: [ Paragraph, Image, ImageUploadEditing, ImageUploadUI, FileRepository, UploadAdapterPluginMock, Clipboard ]
 			} )
 			.then( newEditor => {
 				editor = newEditor;