From 3ef6c15e36a92291b506ea6fcaf0d340b2f53264 Mon Sep 17 00:00:00 2001
From: Aniruddh Singh <aniruddh18122006@gmail.com>
Date: Sun, 11 Oct 2026 21:52:48 +0530
Subject: [PATCH] Fix uppercase image extension MIME handling

---
 playwright/e2e/actions/edit.spec.ts | 37 ++++++++++++++++++++++++++++-
 src/components/ImageEditor.vue      | 21 ++++++++++++----
 2 files changed, 53 insertions(+), 5 deletions(-)

diff --git a/playwright/e2e/actions/edit.spec.ts b/playwright/e2e/actions/edit.spec.ts
index b35176eee..e124120c4 100644
--- a/playwright/e2e/actions/edit.spec.ts
+++ b/playwright/e2e/actions/edit.spec.ts
@@ -13,7 +13,11 @@ test.describe.serial('Open the new saved as image', () => {
 	let page: Page
 
 	test.beforeAll(async ({ browser }) => {
-		({ page } = await setupFilesPage(browser, [{ fixture: 'image1.jpg', mimeType: 'image/jpeg' }]))
+		({ page } = await setupFilesPage(browser, [
+			{ fixture: 'image1.jpg', mimeType: 'image/jpeg' },
+			{ fixture: 'image1.jpg', mimeType: 'image/jpeg', target: '/ABC1234.JPG' },
+			{ fixture: 'image1.jpg', mimeType: 'image/jpeg', target: '/ABC1234.JPEG' },
+		]))
 	})
 
 	test.afterAll(async () => {
@@ -51,4 +55,35 @@ test.describe.serial('Open the new saved as image', () => {
 	test('See the new saved image in the list', async () => {
 		await expect(getRowForFile(page, 'imageSave.jpg')).toContainText('imageSave .jpg')
 	})
+
+	for (const [sourceName, savedName] of [
+		['ABC1234.JPG', 'imageSaveUppercaseJPG.jpg'],
+		['ABC1234.JPEG', 'imageSaveUppercaseJPEG.jpeg'],
+	] as const) {
+		test(`Save ${sourceName} as a valid JPEG with a lowercase extension`, async () => {
+			await openFile(page, sourceName)
+			await getEditButton(page).click()
+			await page.locator('.FIE_topbar-save-button').click()
+
+			const nameInput = page.locator('input[type="text"].SfxInput-Base')
+			await nameInput.clear()
+			await nameInput.fill(savedName.slice(0, savedName.lastIndexOf('.')))
+
+			const uploadRequestPromise = page.waitForRequest(request =>
+				request.method() === 'PUT'
+				&& decodeURIComponent(new URL(request.url()).pathname).endsWith(`/${savedName}`),
+			)
+			await page.locator('.SfxModal-Container button[color="primary"].SfxButton-root')
+				.filter({ hasText: 'Save' })
+				.click()
+
+			const uploadRequest = await uploadRequestPromise
+			expect(uploadRequest.postDataBuffer()?.subarray(0, 2)).toEqual(Buffer.from([0xFF, 0xD8]))
+
+			await page.locator('.FIE_topbar-close-button').click()
+			await expect(getViewerName(page)).toContainText(savedName)
+			await getCloseButton(page).click()
+			await expect(getRowForFile(page, savedName)).toContainText(savedName)
+		})
+	}
 })
diff --git a/src/components/ImageEditor.vue b/src/components/ImageEditor.vue
index 60839d4db..96fb8ab72 100644
--- a/src/components/ImageEditor.vue
+++ b/src/components/ImageEditor.vue
@@ -116,8 +116,10 @@ export default {
 		defaultSavedImageName() {
 			return basename(this.decodedSourceName, extname(this.decodedSourceName))
 		},
+
 		defaultSavedImageType() {
-			return extname(this.decodedSourceName).slice(1) || 'jpeg'
+			const extension = extname(this.decodedSourceName).slice(1)
+			return extension ? extension.toLowerCase() : 'jpeg'
 		},
 
 		hasHighContrastEnabled() {
@@ -278,14 +280,25 @@ export default {
 			}
 
 			// toBlob is not very smart...
-			mimeType = mimeType.replace('jpg', 'jpeg')
+			mimeType = mimeType.toLowerCase().replace(/^image\/jpg$/, 'image/jpeg')
 
 			// Sanity check, 0 < quality < 1
 			quality = Math.max(Math.min(quality, 1), 0) || 1
 
 			try {
-				const blob = await new Promise(resolve => imageCanvas.toBlob(resolve, mimeType, quality))
-				const response = await axios.put(putUrl, new File([blob], fullName))
+				const blob = await new Promise(resolve => {
+					imageCanvas.toBlob(resolve, mimeType, quality)
+				})
+
+				if (!blob || blob.type !== mimeType) {
+					showError(t('viewer', 'Error saving image'))
+					return
+				}
+
+				const response = await axios.put(
+					putUrl,
+					new File([blob], fullName),
+				)
 				logger.info('Edited image saved!', { response })
 				showSuccess(t('viewer', 'Image saved'))
 				if (putUrl !== this.src) {