contented/thumb.go

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package contented
import (
"errors"
"fmt"
"log"
"net/http"
"path/filepath"
"code.ivysaur.me/thumbnail"
)
func thumbnailer(t byte) (*thumbnail.Thumbnailer, error) {
// Modelled on what imgur.com offers
// @ref https://api.imgur.com/models/image#thumbs
const (
cacheSize = 1
outputFmt = thumbnail.OUTPUT_JPG
scaleFmt = thumbnail.SCALEFMT_BILINEAR
)
switch t {
case 's':
return thumbnail.NewThumbnailerEx(90, 90, cacheSize, outputFmt, thumbnail.ASPECT_CROP_TO_DIMENSIONS, scaleFmt), nil
case 'b':
return thumbnail.NewThumbnailerEx(160, 160, cacheSize, outputFmt, thumbnail.ASPECT_CROP_TO_DIMENSIONS, scaleFmt), nil
case 't':
return thumbnail.NewThumbnailerEx(160, 160, cacheSize, outputFmt, thumbnail.ASPECT_RESPECT_MAX_DIMENSION_ONLY, scaleFmt), nil
case 'm':
return thumbnail.NewThumbnailerEx(340, 340, cacheSize, outputFmt, thumbnail.ASPECT_RESPECT_MAX_DIMENSION_ONLY, scaleFmt), nil
case 'l':
return thumbnail.NewThumbnailerEx(640, 640, cacheSize, outputFmt, thumbnail.ASPECT_RESPECT_MAX_DIMENSION_ONLY, scaleFmt), nil
case 'h':
return thumbnail.NewThumbnailerEx(1024, 1024, cacheSize, outputFmt, thumbnail.ASPECT_RESPECT_MAX_DIMENSION_ONLY, scaleFmt), nil
default:
return nil, errors.New("Unsupported thumbnail type (should be s/b/t/m/l/h)")
}
}
func (this *Server) handleThumb(w http.ResponseWriter, r *http.Request, thumbnailType byte, fileId string) {
t, err := thumbnailer(thumbnailType)
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if err != nil {
log.Printf("%s Thumbnail failed: %s\n", this.remoteIP(r), err.Error())
http.Error(w, err.Error(), 400)
return
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}
err = this.handleThumbInternal(w, t, fileId)
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if err != nil {
log.Printf("%s Thumbnail failed: %s\n", this.remoteIP(r), err.Error())
w.Header().Set(`Location`, fmt.Sprintf(`/nothumb_%d.png`, t.Height()))
w.WriteHeader(302)
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}
}
func (this *Server) handleThumbInternal(w http.ResponseWriter, t *thumbnail.Thumbnailer, fileId string) error {
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// Load metadata
m, err := this.Metadata(fileId)
if err != nil {
return err
}
filePath := filepath.Join(this.opts.DataDirectory, m.FileHash)
thumb, err := t.RenderFile_NoCache_MimeType(filePath, m.MimeType)
if err != nil {
return err
}
w.Header().Set(`Content-Length`, fmt.Sprintf("%d", len(thumb)))
w.Header().Set(`Content-Type`, `image/jpeg`)
w.WriteHeader(200)
w.Write(thumb)
return nil
}