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[bugfix] Allow processing of .png files where checksum is not correct (#487)

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* add png stripping code from google/wuffs

* experiment with stripping data from pngs

* add test images

* use StrippedPngDecode for pngs

* add StrippedPngDecode func

* update tests for (no)alphachannel pngs

* nolint on copied function
This commit is contained in:
tobi
2022-04-25 14:45:44 +02:00
committed by GitHub
parent d5fe729cf4
commit eeb78bd141
8 changed files with 352 additions and 3 deletions
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144
internal/media/manager_test.go
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@@ -111,6 +111,150 @@ func (suite *ManagerTestSuite) TestSimpleJpegProcessBlocking() {
suite.Equal(processedThumbnailBytesExpected, processedThumbnailBytes)
}
func (suite *ManagerTestSuite) TestPngNoAlphaChannelProcessBlocking() {
ctx := context.Background()
data := func(_ context.Context) (io.Reader, int, error) {
// load bytes from a test image
b, err := os.ReadFile("./test/test-png-noalphachannel.png")
if err != nil {
panic(err)
}
return bytes.NewBuffer(b), len(b), nil
}
accountID := "01FS1X72SK9ZPW0J1QQ68BD264"
// process the media with no additional info provided
processingMedia, err := suite.manager.ProcessMedia(ctx, data, nil, accountID, nil)
suite.NoError(err)
// fetch the attachment id from the processing media
attachmentID := processingMedia.AttachmentID()
// do a blocking call to fetch the attachment
attachment, err := processingMedia.LoadAttachment(ctx)
suite.NoError(err)
suite.NotNil(attachment)
// make sure it's got the stuff set on it that we expect
// the attachment ID and accountID we expect
suite.Equal(attachmentID, attachment.ID)
suite.Equal(accountID, attachment.AccountID)
// file meta should be correctly derived from the image
suite.EqualValues(gtsmodel.Original{
Width: 186, Height: 187, Size: 34782, Aspect: 0.9946524064171123,
}, attachment.FileMeta.Original)
suite.EqualValues(gtsmodel.Small{
Width: 186, Height: 187, Size: 34782, Aspect: 0.9946524064171123,
}, attachment.FileMeta.Small)
suite.Equal("image/png", attachment.File.ContentType)
suite.Equal("image/jpeg", attachment.Thumbnail.ContentType)
suite.Equal(17471, attachment.File.FileSize)
suite.Equal("LFP?{^.A-?xd.9o#RVRQ~oj:_0xW", attachment.Blurhash)
// now make sure the attachment is in the database
dbAttachment, err := suite.db.GetAttachmentByID(ctx, attachmentID)
suite.NoError(err)
suite.NotNil(dbAttachment)
// make sure the processed file is in storage
processedFullBytes, err := suite.storage.Get(attachment.File.Path)
suite.NoError(err)
suite.NotEmpty(processedFullBytes)
// load the processed bytes from our test folder, to compare
processedFullBytesExpected, err := os.ReadFile("./test/test-png-noalphachannel-processed.png")
suite.NoError(err)
suite.NotEmpty(processedFullBytesExpected)
// the bytes in storage should be what we expected
suite.Equal(processedFullBytesExpected, processedFullBytes)
// now do the same for the thumbnail and make sure it's what we expected
processedThumbnailBytes, err := suite.storage.Get(attachment.Thumbnail.Path)
suite.NoError(err)
suite.NotEmpty(processedThumbnailBytes)
processedThumbnailBytesExpected, err := os.ReadFile("./test/test-png-noalphachannel-thumbnail.jpg")
suite.NoError(err)
suite.NotEmpty(processedThumbnailBytesExpected)
suite.Equal(processedThumbnailBytesExpected, processedThumbnailBytes)
}
func (suite *ManagerTestSuite) TestPngAlphaChannelProcessBlocking() {
ctx := context.Background()
data := func(_ context.Context) (io.Reader, int, error) {
// load bytes from a test image
b, err := os.ReadFile("./test/test-png-alphachannel.png")
if err != nil {
panic(err)
}
return bytes.NewBuffer(b), len(b), nil
}
accountID := "01FS1X72SK9ZPW0J1QQ68BD264"
// process the media with no additional info provided
processingMedia, err := suite.manager.ProcessMedia(ctx, data, nil, accountID, nil)
suite.NoError(err)
// fetch the attachment id from the processing media
attachmentID := processingMedia.AttachmentID()
// do a blocking call to fetch the attachment
attachment, err := processingMedia.LoadAttachment(ctx)
suite.NoError(err)
suite.NotNil(attachment)
// make sure it's got the stuff set on it that we expect
// the attachment ID and accountID we expect
suite.Equal(attachmentID, attachment.ID)
suite.Equal(accountID, attachment.AccountID)
// file meta should be correctly derived from the image
suite.EqualValues(gtsmodel.Original{
Width: 186, Height: 187, Size: 34782, Aspect: 0.9946524064171123,
}, attachment.FileMeta.Original)
suite.EqualValues(gtsmodel.Small{
Width: 186, Height: 187, Size: 34782, Aspect: 0.9946524064171123,
}, attachment.FileMeta.Small)
suite.Equal("image/png", attachment.File.ContentType)
suite.Equal("image/jpeg", attachment.Thumbnail.ContentType)
suite.Equal(18904, attachment.File.FileSize)
suite.Equal("LFP?{^.A-?xd.9o#RVRQ~oj:_0xW", attachment.Blurhash)
// now make sure the attachment is in the database
dbAttachment, err := suite.db.GetAttachmentByID(ctx, attachmentID)
suite.NoError(err)
suite.NotNil(dbAttachment)
// make sure the processed file is in storage
processedFullBytes, err := suite.storage.Get(attachment.File.Path)
suite.NoError(err)
suite.NotEmpty(processedFullBytes)
// load the processed bytes from our test folder, to compare
processedFullBytesExpected, err := os.ReadFile("./test/test-png-alphachannel-processed.png")
suite.NoError(err)
suite.NotEmpty(processedFullBytesExpected)
// the bytes in storage should be what we expected
suite.Equal(processedFullBytesExpected, processedFullBytes)
// now do the same for the thumbnail and make sure it's what we expected
processedThumbnailBytes, err := suite.storage.Get(attachment.Thumbnail.Path)
suite.NoError(err)
suite.NotEmpty(processedThumbnailBytes)
processedThumbnailBytesExpected, err := os.ReadFile("./test/test-png-alphachannel-thumbnail.jpg")
suite.NoError(err)
suite.NotEmpty(processedThumbnailBytesExpected)
suite.Equal(processedThumbnailBytesExpected, processedThumbnailBytes)
}
func (suite *ManagerTestSuite) TestSimpleJpegProcessBlockingWithCallback() {
ctx := context.Background()