58 lines
1.2 KiB
Go
58 lines
1.2 KiB
Go
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package main
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import (
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"bytes"
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"github.com/anthonynsimon/bild/transform"
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"image"
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"image/jpeg"
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"image/png"
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"io"
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"strings"
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)
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var mimeTypes = map[string]string{
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"jpg": "image/jpg",
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"jpeg": "image/jpeg",
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"png": "image/png",
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"json": "application/json",
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"html": "text/html",
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"xml": "application/xml",
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}
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func readMimeType(path string, mimeType string) string {
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if mimeType != "" {
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return mimeType
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}
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parts := strings.Split(path, ".")
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fileType := parts[len(parts)-1]
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if value, exists := mimeTypes[fileType]; exists {
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return value
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}
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return "application/octet-stream"
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}
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func resizeImage(imageBytes []byte, resizeHeight int) ([]byte, error) {
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img, format, err := image.Decode(bytes.NewReader(imageBytes))
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if err != nil {
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return nil, err
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}
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var buffer bytes.Buffer
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writer := io.Writer(&buffer)
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resizeWidth := img.Bounds().Dx() * resizeHeight / img.Bounds().Dy()
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img = transform.Resize(img, resizeWidth, resizeHeight, transform.Gaussian)
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switch format {
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case "png":
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err = png.Encode(writer, img)
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break
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case "jpeg":
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err = jpeg.Encode(writer, img, nil)
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break
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default:
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err = jpeg.Encode(writer, img, nil)
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}
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if err != nil {
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return nil, err
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}
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return buffer.Bytes(), nil
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}
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