Fix/interactive message stale image cache key

app/components/block_renderer/mm_blocks_image.tsx

@@ -86,7 +86,7 @@ const MmBlocksImageContent = ({
         return computeMmBlocksImageLayout(caps, layoutWidth, imageMetadata, viewPortWidth);
     }, [caps, imageMetadata, intrinsicSize, layoutWidth, viewPortWidth]);
 
-    const fileId = useRef(`uid-mm-blocks-image-${urlSafeBase64Encode(imageUrl)}`);
+    const fileId = useMemo(() => `uid-mm-blocks-image-${urlSafeBase64Encode(imageUrl)}`, [imageUrl]);
 
     const dimensionsStyle = useMemo(() => ({
         width: layout.width,
@@ -97,7 +97,7 @@ const MmBlocksImageContent = ({
 
     const onPress = useCallback(() => {
         const item: GalleryItemType = {
-            id: fileId.current,
+            id: fileId,
             postId,
             uri: displaySrc,
             width: layout.galleryWidth,
@@ -106,10 +106,10 @@ const MmBlocksImageContent = ({
             mime_type: lookupMimeType(imageUrl) || 'image/png',
             type: 'image',
             lastPictureUpdate: 0,
-            cacheKey: fileId.current,
+            cacheKey: fileId,
         };
         openGalleryAtIndex(galleryIdentifier, 0, [item]);
-    }, [altText, displaySrc, galleryIdentifier, imageUrl, layout.galleryHeight, layout.galleryWidth, postId]);
+    }, [altText, displaySrc, fileId, galleryIdentifier, imageUrl, layout.galleryHeight, layout.galleryWidth, postId]);
 
     const {ref, onGestureEvent, styles: galleryStyles} = useGalleryItem(
         galleryIdentifier,
@@ -159,9 +159,9 @@ const MmBlocksImageContent = ({
 
         return (
             <ExpoImage
-                id={fileId.current}
+                id={fileId}
                 ref={ref}
-                nativeID={`MmBlocksImage-${fileId.current}`}
+                nativeID={`MmBlocksImage-${fileId}`}
                 source={{uri: displaySrc}}
                 style={[dimensionsStyle, {borderRadius: imageBorderRadius}]}
                 contentFit={imageStyle === 'person' ? 'cover' : 'contain'}

app/components/post_list/post/body/content/message_attachments/attachment_image/index.test.tsx

@@ -0,0 +1,130 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import React from 'react';
+
+import ProgressiveImage from '@components/progressive_image';
+import {Screens, Preferences} from '@constants';
+import {renderWithIntlAndTheme} from '@test/intl-test-helper';
+import {openGalleryAtIndex} from '@utils/gallery';
+import {urlSafeBase64Encode} from '@utils/security';
+
+import AttachmentImage from './index';
+
+jest.mock('@components/progressive_image', () => ({
+    __esModule: true,
+    default: jest.fn(() => null),
+}));
+
+jest.mock('@context/gallery', () => ({
+    GalleryInit: ({children}: {children: React.ReactNode}) => children,
+}));
+
+jest.mock('@hooks/device', () => ({
+    useIsTablet: () => false,
+}));
+
+jest.mock('@hooks/gallery', () => ({
+    useGalleryItem: jest.fn((_galleryIdentifier, _index, onPress) => ({
+        ref: {current: null},
+        onGestureEvent: onPress,
+        styles: {},
+    })),
+}));
+
+jest.mock('@utils/gallery', () => ({
+    openGalleryAtIndex: jest.fn(),
+}));
+
+jest.mock('@utils/url', () => ({
+    ...jest.requireActual('@utils/url'),
+    isValidUrl: (url: string) => url.startsWith('https://'),
+}));
+
+const IMAGE_URL = 'https://example.com/quotes/image/AAPL_day.png';
+const IMAGE_URL_2 = 'https://example.com/quotes/image/AAPL_week.png';
+const IMAGE_METADATA = {width: 700, height: 300, format: 'png', frame_count: 0} as PostImage;
+
+describe('AttachmentImage', () => {
+    const theme = Preferences.THEMES.denim;
+
+    beforeEach(() => {
+        jest.clearAllMocks();
+    });
+
+    function buildElement(props: Partial<React.ComponentProps<typeof AttachmentImage>> = {}) {
+        return (
+            <AttachmentImage
+                imageUrl={IMAGE_URL}
+                imageMetadata={IMAGE_METADATA}
+                layoutWidth={400}
+                location={Screens.CHANNEL}
+                postId='post-id'
+                theme={theme}
+                {...props}
+            />
+        );
+    }
+
+    function renderImage(props: Partial<React.ComponentProps<typeof AttachmentImage>> = {}) {
+        return renderWithIntlAndTheme(buildElement(props));
+    }
+
+    function lastProgressiveImageId() {
+        const calls = jest.mocked(ProgressiveImage).mock.calls;
+        return calls[calls.length - 1][0].id;
+    }
+
+    it('renders ProgressiveImage with the image and a cache id derived from imageUrl', () => {
+        renderImage();
+
+        expect(ProgressiveImage).toHaveBeenCalledWith(
+            expect.objectContaining({
+                imageUri: IMAGE_URL,
+                id: `uid-${urlSafeBase64Encode(IMAGE_URL)}`,
+            }),
+            undefined,
+        );
+    });
+
+    // Regression test for the stale-image bug: when the same post is edited in place
+    // to a new image URL, the cache id must follow imageUrl. Previously it was frozen
+    // via useRef, so the new image rendered under the old cache key and stayed stale.
+    it('updates the cache id when imageUrl changes on re-render', () => {
+        const {rerender} = renderImage({imageUrl: IMAGE_URL});
+        const firstId = lastProgressiveImageId();
+        expect(firstId).toBe(`uid-${urlSafeBase64Encode(IMAGE_URL)}`);
+
+        rerender(buildElement({imageUrl: IMAGE_URL_2}));
+        const secondId = lastProgressiveImageId();
+
+        expect(secondId).toBe(`uid-${urlSafeBase64Encode(IMAGE_URL_2)}`);
+        expect(secondId).not.toBe(firstId);
+    });
+
+    it('opens the gallery with a cacheKey matching the current imageUrl', () => {
+        renderImage();
+
+        // Trigger the gallery open via the captured gesture handler.
+        const {useGalleryItem} = jest.requireMock('@hooks/gallery');
+        const onGestureEvent = jest.mocked(useGalleryItem).mock.results.at(-1)!.value.onGestureEvent;
+        onGestureEvent();
+
+        expect(openGalleryAtIndex).toHaveBeenCalledWith(
+            `post-id-AttachmentImage-${Screens.CHANNEL}`,
+            0,
+            expect.arrayContaining([
+                expect.objectContaining({
+                    id: `uid-${urlSafeBase64Encode(IMAGE_URL)}`,
+                    cacheKey: `uid-${urlSafeBase64Encode(IMAGE_URL)}`,
+                    uri: IMAGE_URL,
+                }),
+            ]),
+        );
+    });
+
+    it('renders an error frame for an invalid url and skips ProgressiveImage', () => {
+        renderImage({imageUrl: 'not-a-url'});
+        expect(ProgressiveImage).not.toHaveBeenCalled();
+    });
+});

app/components/post_list/post/body/content/message_attachments/attachment_image/index.tsx

@@ -1,7 +1,7 @@
 // Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
 // See LICENSE.txt for license information.
 
-import React, {useCallback, useMemo, useRef, useState} from 'react';
+import React, {useCallback, useMemo, useState} from 'react';
 import {TouchableWithoutFeedback, View} from 'react-native';
 import Animated from 'react-native-reanimated';
 
@@ -55,10 +55,7 @@ export type Props = {
 const AttachmentImage = ({imageUrl, imageMetadata, layoutWidth, location, postId, theme}: Props) => {
     const galleryIdentifier = `${postId}-AttachmentImage-${location}`;
     const [error, setError] = useState(false);
-    const fileId = useRef<string | null>(null);
-    if (fileId.current === null) {
-        fileId.current = `uid-${urlSafeBase64Encode(imageUrl)}`;
-    }
+    const fileId = useMemo(() => `uid-${urlSafeBase64Encode(imageUrl)}`, [imageUrl]);
     const isTablet = useIsTablet();
     const {height, width} = calculateDimensions(imageMetadata.height, imageMetadata.width, layoutWidth || getViewPortWidth(false, isTablet, true));
     const style = getStyleSheet(theme);
@@ -70,7 +67,7 @@ const AttachmentImage = ({imageUrl, imageMetadata, layoutWidth, location, postId
 
     const onPress = () => {
         const item: GalleryItemType = {
-            id: fileId.current || '',
+            id: fileId || '',
             postId,
             uri: imageUrl,
             width: imageMetadata.width,
@@ -79,7 +76,7 @@ const AttachmentImage = ({imageUrl, imageMetadata, layoutWidth, location, postId
             mime_type: lookupMimeType(imageUrl) || 'image/png',
             type: 'image',
             lastPictureUpdate: 0,
-            cacheKey: fileId.current || '',
+            cacheKey: fileId || '',
         };
         openGalleryAtIndex(galleryIdentifier, 0, [item]);
     };
@@ -109,7 +106,7 @@ const AttachmentImage = ({imageUrl, imageMetadata, layoutWidth, location, postId
                     <Animated.View testID={`attachmentImage-${fileId}`}>
                         <ProgressiveImage
                             forwardRef={ref}
-                            id={fileId.current}
+                            id={fileId}
                             imageStyle={style.attachmentMargin}
                             imageUri={imageUrl}
                             onError={onError}