74 lines
2.1 KiB
Go
74 lines
2.1 KiB
Go
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package contented
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import (
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"errors"
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"fmt"
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"log"
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"net/http"
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"path/filepath"
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"code.ivysaur.me/thumbnail"
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)
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func thumbnailer(t byte) (*thumbnail.Thumbnailer, error) {
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// Modelled on what imgur.com offers
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// @ref https://api.imgur.com/models/image#thumbs
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const (
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cacheSize = 1
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outputFmt = thumbnail.OUTPUT_JPG
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scaleFmt = thumbnail.SCALEFMT_BILINEAR
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)
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switch t {
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case 's':
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return thumbnail.NewThumbnailerEx(90, 90, cacheSize, outputFmt, thumbnail.ASPECT_CROP_TO_DIMENSIONS, scaleFmt), nil
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case 'b':
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return thumbnail.NewThumbnailerEx(160, 160, cacheSize, outputFmt, thumbnail.ASPECT_CROP_TO_DIMENSIONS, scaleFmt), nil
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case 't':
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return thumbnail.NewThumbnailerEx(160, 160, cacheSize, outputFmt, thumbnail.ASPECT_RESPECT_MAX_DIMENSION_ONLY, scaleFmt), nil
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case 'm':
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return thumbnail.NewThumbnailerEx(340, 340, cacheSize, outputFmt, thumbnail.ASPECT_RESPECT_MAX_DIMENSION_ONLY, scaleFmt), nil
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case 'l':
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return thumbnail.NewThumbnailerEx(640, 640, cacheSize, outputFmt, thumbnail.ASPECT_RESPECT_MAX_DIMENSION_ONLY, scaleFmt), nil
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case 'h':
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return thumbnail.NewThumbnailerEx(1024, 1024, cacheSize, outputFmt, thumbnail.ASPECT_RESPECT_MAX_DIMENSION_ONLY, scaleFmt), nil
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default:
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return nil, errors.New("Unsupported thumbnail type (should be s/b/t/m/l/h)")
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}
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}
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func (this *Server) handleThumb(w http.ResponseWriter, r *http.Request, thumbnailType byte, fileId string) {
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err := this.handleThumbInternal(w, thumbnailType, fileId)
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if err != nil {
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log.Printf("%s Thumbnail failed: %s\n", this.remoteIP(r), err.Error())
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http.Error(w, "Couldn't provide content", 500)
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}
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}
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func (this *Server) handleThumbInternal(w http.ResponseWriter, thumbnailType byte, fileId string) error {
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t, err := thumbnailer(thumbnailType)
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if err != nil {
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return err
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}
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// Load metadata
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m, err := this.Metadata(fileId)
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if err != nil {
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return err
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}
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filePath := filepath.Join(this.opts.DataDirectory, m.FileHash)
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thumb, err := t.RenderFile_NoCache_MimeType(filePath, m.MimeType)
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if err != nil {
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return err
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}
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w.Header().Set(`Content-Length`, fmt.Sprintf("%d", len(thumb)))
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w.Header().Set(`Content-Type`, `image/jpeg`)
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w.WriteHeader(200)
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w.Write(thumb)
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return nil
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}
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