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feat: reintroducing thumbnails (#3821)
* Reintroducing thumbnails * Aligned with linting rules * making recomended code review change - changed method names to start with lower case as they are not used outside of their package - made receiver types for struct funcs to be pointers to not need to create copies Trying to cover all linting issues - converted slog warning to use attributes when logging warnings - seperated imports to have package files in their own section * Update go.mod --------- Co-authored-by: boojack <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| package v1 | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "fmt" | ||
| "image" | ||
| "io" | ||
| "os" | ||
| "path/filepath" | ||
| "sync/atomic" | ||
|
|
||
| "github.com/disintegration/imaging" | ||
| "github.com/pkg/errors" | ||
|
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| "github.com/usememos/memos/store" | ||
| ) | ||
|
|
||
| // thumbnail provides functionality to manage thumbnail images | ||
| // for resources. | ||
| type thumbnail struct { | ||
| // The resource the thumbnail is for | ||
| resource *store.Resource | ||
| } | ||
|
|
||
| func (thumbnail) supportedMimeTypes() []string { | ||
| return []string{ | ||
| "image/png", | ||
| "image/jpeg", | ||
| } | ||
| } | ||
|
|
||
| func (t *thumbnail) getFilePath(assetsFolderPath string) (string, error) { | ||
| if assetsFolderPath == "" { | ||
| return "", errors.New("aapplication path is not set") | ||
| } | ||
|
|
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| ext := filepath.Ext(t.resource.Filename) | ||
| path := filepath.Join(assetsFolderPath, thumbnailImagePath, fmt.Sprintf("%d%s", t.resource.ID, ext)) | ||
|
|
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| return path, nil | ||
| } | ||
|
|
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| func (t *thumbnail) getFile(assetsFolderPath string) ([]byte, error) { | ||
| path, err := t.getFilePath(assetsFolderPath) | ||
|
|
||
| if err != nil { | ||
| return nil, errors.Wrap(err, "failed to get thumbnail file path") | ||
| } | ||
|
|
||
| if _, err := os.Stat(path); err != nil { | ||
| if !errors.Is(err, os.ErrNotExist) { | ||
| return nil, errors.Wrap(err, "failed to check thumbnail image stat") | ||
| } | ||
| } | ||
|
|
||
| dstFile, err := os.Open(path) | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, "failed to open thumbnail file") | ||
| } | ||
| defer dstFile.Close() | ||
|
|
||
| dstBlob, err := io.ReadAll(dstFile) | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, "failed to read thumbnail file") | ||
| } | ||
|
|
||
| return dstBlob, nil | ||
| } | ||
|
|
||
| func (thumbnail) generateImage(sourceBlob []byte) (image.Image, error) { | ||
| var availableGeneratorAmount int32 = 32 | ||
|
|
||
| if atomic.LoadInt32(&availableGeneratorAmount) <= 0 { | ||
| return nil, errors.New("not enough available generator amount") | ||
| } | ||
|
|
||
| atomic.AddInt32(&availableGeneratorAmount, -1) | ||
| defer func() { | ||
| atomic.AddInt32(&availableGeneratorAmount, 1) | ||
| }() | ||
|
|
||
| reader := bytes.NewReader(sourceBlob) | ||
| src, err := imaging.Decode(reader, imaging.AutoOrientation(true)) | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, "failed to decode thumbnail image") | ||
| } | ||
|
|
||
| thumbnailImage := imaging.Resize(src, 512, 0, imaging.Lanczos) | ||
| return thumbnailImage, nil | ||
| } | ||
|
|
||
| func (t *thumbnail) saveAsFile(assetsFolderPath string, thumbnailImage image.Image) error { | ||
| path, err := t.getFilePath(assetsFolderPath) | ||
| if err != nil { | ||
| return errors.Wrap(err, "failed to get thumbnail file path") | ||
| } | ||
|
|
||
| dstDir := filepath.Dir(path) | ||
| if err := os.MkdirAll(dstDir, os.ModePerm); err != nil { | ||
| return errors.Wrap(err, "failed to create thumbnail directory") | ||
| } | ||
|
|
||
| if err := imaging.Save(thumbnailImage, path); err != nil { | ||
| return errors.Wrap(err, "failed to save thumbnail file") | ||
| } | ||
|
|
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| return nil | ||
| } | ||
|
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| func (t *thumbnail) imageToBlob(thumbnailImage image.Image) ([]byte, error) { | ||
| mimeTypeMap := map[string]imaging.Format{ | ||
| "image/png": imaging.JPEG, | ||
| "image/jpeg": imaging.PNG, | ||
| } | ||
|
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||
| imgFormat, ok := mimeTypeMap[t.resource.Type] | ||
| if !ok { | ||
| return nil, errors.New("failed to map resource type to an image encoder format") | ||
| } | ||
|
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| buf := new(bytes.Buffer) | ||
| if err := imaging.Encode(buf, thumbnailImage, imgFormat); err != nil { | ||
| return nil, errors.Wrap(err, "failed to convert thumbnail image to bytes") | ||
| } | ||
|
|
||
| return buf.Bytes(), nil | ||
| } | ||
|
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||
| func (t *thumbnail) deleteFile(assetsFolderPath string) error { | ||
| path, err := t.getFilePath(assetsFolderPath) | ||
| if err != nil { | ||
| return errors.Wrap(err, "failed to get thumbnail file path") | ||
| } | ||
|
|
||
| if _, err := os.Stat(path); err != nil { | ||
| if !errors.Is(err, os.ErrNotExist) { | ||
| return errors.Wrap(err, "failed to check thumbnail image stat") | ||
| } | ||
| } | ||
|
|
||
| if err := os.Remove(path); err != nil { | ||
| return errors.Wrap(err, "failed to delete thumbnail file") | ||
| } | ||
|
|
||
| return nil | ||
| } |
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