Remove exif tags when processing images

6 files changed, 67 insertions, 12 deletions

diff --git a/.github/actions/reusable-prepare-peertube-run/action.yml b/.github/actions/reusable-prepare-peertube-run/action.yml
index 1a6cd2cfd..aa5b897c9 100644
--- a/.github/actions/reusable-prepare-peertube-run/action.yml
+++ b/.github/actions/reusable-prepare-peertube-run/action.yml
@@ -8,7 +8,7 @@ runs:
     - name: Setup system dependencies
       shell: bash
       run: |
-        sudo apt-get install postgresql-client-common redis-tools parallel
+        sudo apt-get install postgresql-client-common redis-tools parallel libimage-exiftool-perl
         wget --quiet --no-check-certificate "https://download.cpy.re/ffmpeg/ffmpeg-release-4.3.1-64bit-static.tar.xz"
         tar xf ffmpeg-release-4.3.1-64bit-static.tar.xz
         mkdir -p $HOME/bin
diff --git a/server/helpers/image-utils.ts b/server/helpers/image-utils.ts
index b174ae436..28d8fff4c 100644
--- a/server/helpers/image-utils.ts
+++ b/server/helpers/image-utils.ts
@@ -80,6 +80,8 @@ async function autoResize (options: {
   const sourceIsPortrait = sourceImage.getWidth() < sourceImage.getHeight()
   const destIsPortraitOrSquare = newSize.width <= newSize.height
 
+  removeExif(sourceImage)
+
   if (sourceIsPortrait && !destIsPortraitOrSquare) {
     const baseImage = sourceImage.cloneQuiet().cover(newSize.width, newSize.height)
                                               .color([ { apply: 'shade', params: [ 50 ] } ])
@@ -106,6 +108,7 @@ function skipProcessing (options: {
   const { sourceImage, newSize, imageBytes, inputExt, outputExt } = options
   const { width, height } = newSize
 
+  if (hasExif(sourceImage)) return false
   if (sourceImage.getWidth() > width || sourceImage.getHeight() > height) return false
   if (inputExt !== outputExt) return false
 
@@ -116,3 +119,11 @@ function skipProcessing (options: {
 
   return imageBytes <= 15 * kB
 }
+
+function hasExif (image: Jimp) {
+  return !!(image.bitmap as any).exifBuffer
+}
+
+function removeExif (image: Jimp) {
+  (image.bitmap as any).exifBuffer = null
+}
diff --git a/server/tests/fixtures/exif.jpg b/server/tests/fixtures/exif.jpg
new file mode 100644
index 000000000..2997b38e9
--- /dev/null
+++ b/server/tests/fixtures/exif.jpg
diff --git a/server/tests/fixtures/exif.png b/server/tests/fixtures/exif.png
new file mode 100644
index 000000000..a1a0113f8
--- /dev/null
+++ b/server/tests/fixtures/exif.png
diff --git a/server/tests/helpers/image.ts b/server/tests/helpers/image.ts
index 64bd373cc..475ca8fb2 100644
--- a/server/tests/helpers/image.ts
+++ b/server/tests/helpers/image.ts
@@ -4,6 +4,7 @@ import 'mocha'
 import { expect } from 'chai'
 import { readFile, remove } from 'fs-extra'
 import { join } from 'path'
+import { execPromise } from '@server/helpers/core-utils'
 import { buildAbsoluteFixturePath, root } from '@shared/core-utils'
 import { processImage } from '../../../server/helpers/image-utils'
 
@@ -20,40 +21,77 @@ async function checkBuffers (path1: string, path2: string, equals: boolean) {
   }
 }
 
+async function hasTitleExif (path: string) {
+  const result = JSON.parse(await execPromise(`exiftool -json ${path}`))
+
+  return result[0]?.Title === 'should be removed'
+}
+
 describe('Image helpers', function () {
   const imageDestDir = join(root(), 'test-images')
-  const imageDest = join(imageDestDir, 'test.jpg')
+
+  const imageDestJPG = join(imageDestDir, 'test.jpg')
+  const imageDestPNG = join(imageDestDir, 'test.png')
+
   const thumbnailSize = { width: 223, height: 122 }
 
   it('Should skip processing if the source image is okay', async function () {
     const input = buildAbsoluteFixturePath('thumbnail.jpg')
-    await processImage(input, imageDest, thumbnailSize, true)
+    await processImage(input, imageDestJPG, thumbnailSize, true)
 
-    await checkBuffers(input, imageDest, true)
+    await checkBuffers(input, imageDestJPG, true)
   })
 
   it('Should not skip processing if the source image does not have the appropriate extension', async function () {
     const input = buildAbsoluteFixturePath('thumbnail.png')
-    await processImage(input, imageDest, thumbnailSize, true)
+    await processImage(input, imageDestJPG, thumbnailSize, true)
 
-    await checkBuffers(input, imageDest, false)
+    await checkBuffers(input, imageDestJPG, false)
   })
 
   it('Should not skip processing if the source image does not have the appropriate size', async function () {
     const input = buildAbsoluteFixturePath('preview.jpg')
-    await processImage(input, imageDest, thumbnailSize, true)
+    await processImage(input, imageDestJPG, thumbnailSize, true)
 
-    await checkBuffers(input, imageDest, false)
+    await checkBuffers(input, imageDestJPG, false)
   })
 
   it('Should not skip processing if the source image does not have the appropriate size', async function () {
     const input = buildAbsoluteFixturePath('thumbnail-big.jpg')
-    await processImage(input, imageDest, thumbnailSize, true)
+    await processImage(input, imageDestJPG, thumbnailSize, true)
+
+    await checkBuffers(input, imageDestJPG, false)
+  })
+
+  it('Should strip exif for a jpg file that can not be copied', async function () {
+    const input = buildAbsoluteFixturePath('exif.jpg')
+    expect(await hasTitleExif(input)).to.be.true
+
+    await processImage(input, imageDestJPG, { width: 100, height: 100 }, true)
+    await checkBuffers(input, imageDestJPG, false)
+
+    expect(await hasTitleExif(imageDestJPG)).to.be.false
+  })
+
+  it('Should strip exif for a jpg file that could be copied', async function () {
+    const input = buildAbsoluteFixturePath('exif.jpg')
+    expect(await hasTitleExif(input)).to.be.true
+
+    await processImage(input, imageDestJPG, thumbnailSize, true)
+    await checkBuffers(input, imageDestJPG, false)
+
+    expect(await hasTitleExif(imageDestJPG)).to.be.false
+  })
+
+  it('Should strip exif for png', async function () {
+    const input = buildAbsoluteFixturePath('exif.png')
+    expect(await hasTitleExif(input)).to.be.true
 
-    await checkBuffers(input, imageDest, false)
+    await processImage(input, imageDestPNG, thumbnailSize, true)
+    expect(await hasTitleExif(imageDestPNG)).to.be.false
   })
 
   after(async function () {
-    await remove(imageDest)
+    await remove(imageDestDir)
   })
 })
diff --git a/support/doc/development/tests.md b/support/doc/development/tests.md
index 02fc41147..47602156c 100644
--- a/support/doc/development/tests.md
+++ b/support/doc/development/tests.md
@@ -31,6 +31,12 @@ $ sudo docker run -p 9444:9000 chocobozzz/s3-ninja
 $ sudo docker run -p 10389:10389 chocobozzz/docker-test-openldap
 ```
 
+Ensure you also have these commands:
+
+```
+$ exiftool --help
+```
+
 ### Test
 
 To run all test suites:
@@ -39,7 +45,7 @@ To run all test suites:
 $ npm run test # See scripts/test.sh to run a particular suite
 ```
 
-Most of tests can be runned using:
+Most of tests can be run using:
 
 ```bash
 TS_NODE_TRANSPILE_ONLY=true npm run mocha -- --timeout 30000 --exit -r ts-node/register -r tsconfig-paths/register --bail server/tests/api/videos/video-transcoder.ts