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implement thumbnail support for txt files
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David Christofas
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Apr 29, 2021
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,5 @@ | ||
| Enhancement: Support thumbnails for txt files | ||
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| Implemented support for thumbnails for txt files in the thumbnails service. | ||
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| https://github.com/owncloud/ocis/pull/1988 |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| package preprocessor | ||
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| import ( | ||
| "bufio" | ||
| "github.com/golang/freetype" | ||
| "github.com/golang/freetype/truetype" | ||
| "github.com/pkg/errors" | ||
| "golang.org/x/image/font" | ||
| "golang.org/x/image/font/gofont/goregular" | ||
| "image" | ||
| "image/draw" | ||
| "io" | ||
| "mime" | ||
| "strings" | ||
| ) | ||
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| const ( | ||
| fontSize = 12 | ||
| spacing float64 = 1.5 | ||
| ) | ||
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| type FileConverter interface { | ||
| Convert(r io.Reader) (image.Image, error) | ||
| } | ||
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| type ImageDecoder struct{} | ||
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| func (i ImageDecoder) Convert(r io.Reader) (image.Image, error) { | ||
| img, _, err := image.Decode(r) | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, `could not decode the image`) | ||
| } | ||
| return img, nil | ||
| } | ||
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| type TxtToImageConverter struct{} | ||
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| func (t TxtToImageConverter) Convert(r io.Reader) (image.Image, error) { | ||
| img := image.NewRGBA(image.Rect(0, 0, 640, 480)) | ||
| draw.Draw(img, img.Bounds(), image.White, image.Point{}, draw.Src) | ||
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| c := freetype.NewContext() | ||
| // Ignoring the error since we are using the embedded Golang font. | ||
| // This shouldn't return an error. | ||
| f, _ := truetype.Parse(goregular.TTF) | ||
| c.SetFont(f) | ||
| c.SetFontSize(fontSize) | ||
| c.SetClip(img.Bounds()) | ||
| c.SetDst(img) | ||
| c.SetSrc(image.Black) | ||
| c.SetHinting(font.HintingFull) | ||
| pt := freetype.Pt(10, 10+int(c.PointToFixed(fontSize)>>6)) | ||
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| scanner := bufio.NewScanner(r) | ||
| for scanner.Scan() { | ||
| txt := scanner.Text() | ||
| cs := chunks(txt, 80) | ||
| for _, s := range cs { | ||
| _, err := c.DrawString(strings.TrimSpace(s), pt) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| pt.Y += c.PointToFixed(fontSize * spacing) | ||
| if pt.Y.Round() >= img.Bounds().Dy() { | ||
| return img, scanner.Err() | ||
| } | ||
| } | ||
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| } | ||
| return img, scanner.Err() | ||
| } | ||
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| // Code from https://stackoverflow.com/a/61469854 | ||
| // Written By Igor Mikushkin | ||
| func chunks(s string, chunkSize int) []string { | ||
| if chunkSize >= len(s) { | ||
| return []string{s} | ||
| } | ||
| var chunks []string | ||
| chunk := make([]rune, chunkSize) | ||
| length := 0 | ||
| for _, r := range s { | ||
| chunk[length] = r | ||
| length++ | ||
| if length == chunkSize { | ||
| chunks = append(chunks, string(chunk)) | ||
| length = 0 | ||
| } | ||
| } | ||
| if length > 0 { | ||
| chunks = append(chunks, string(chunk[:length])) | ||
| } | ||
| return chunks | ||
| } | ||
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| func ForType(mimeType string) FileConverter { | ||
| // We can ignore the error here because we parse it in IsMimeTypeSupported before and if it fails | ||
| // return the service call. So we should only get here when the mimeType parses fine. | ||
| mimeType, _, _ = mime.ParseMediaType(mimeType) | ||
| switch mimeType { | ||
| case "text/plain": | ||
| return TxtToImageConverter{} | ||
| default: | ||
| return ImageDecoder{} | ||
| } | ||
| } |
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