feat(thumbnails): allow thumbnails on ggp files

Signed-off-by: jkoberg <jkoberg@owncloud.com>

changelog/unreleased/ggp-mimetype-thumbnails.md

@@ -0,0 +1,5 @@
+Enhancement: Create thumbnails for GGP MIME types
+
+Creates thumbnails for newly added ggp files
+
+https://github.com/owncloud/ocis/pull/10303

services/thumbnails/pkg/preprocessor/preprocessor.go

@@ -39,11 +39,10 @@ func (i GifDecoder) Convert(r io.Reader) (interface{}, error) {
 }
 
 // GgsDecoder is a converter for the geogebra slides file
-type GgsDecoder struct{}
+type GgsDecoder struct{ thumbnailpath string }
 
 // Convert reads the ggs file and returns the thumbnail image
 func (g GgsDecoder) Convert(r io.Reader) (interface{}, error) {
-	geogebraThumbnail := "_slide0/geogebra_thumbnail.png"
 	var buf bytes.Buffer
 	_, err := io.Copy(&buf, r)
 	if err != nil {
@@ -54,7 +53,7 @@ func (g GgsDecoder) Convert(r io.Reader) (interface{}, error) {
 		return nil, err
 	}
 	for _, file := range zipReader.File {
-		if file.Name == geogebraThumbnail {
+		if file.Name == g.thumbnailpath {
 			thumbnail, err := file.Open()
 			if err != nil {
 				return nil, err
@@ -70,7 +69,7 @@ func (g GgsDecoder) Convert(r io.Reader) (interface{}, error) {
 			return img, nil
 		}
 	}
-	return nil, errors.Errorf("%s not found", geogebraThumbnail)
+	return nil, errors.Errorf("%s not found", g.thumbnailpath)
 }
 
 // AudioDecoder is a converter for the audio file
@@ -258,7 +257,9 @@ func ForType(mimeType string, opts map[string]interface{}) FileConverter {
 			fontLoader: fontLoader,
 		}
 	case "application/vnd.geogebra.slides":
-		return GgsDecoder{}
+		return GgsDecoder{"_slide0/geogebra_thumbnail.png"}
+	case "application/vnd.geogebra.pinboard":
+		return GgsDecoder{"geogebra_thumbnail.png"}
 	case "image/gif":
 		return GifDecoder{}
 	case "audio/flac":

services/thumbnails/pkg/preprocessor/preprocessor_test.go

@@ -2,12 +2,13 @@ package preprocessor
 
 import (
 	"bytes"
-	"golang.org/x/image/font"
-	"golang.org/x/image/font/opentype"
 	"io"
 	"os"
 	"testing"
 
+	"golang.org/x/image/font"
+	"golang.org/x/image/font/opentype"
+
 	. "github.com/onsi/ginkgo"
 	. "github.com/onsi/gomega"
 )
@@ -80,14 +81,14 @@ var _ = Describe("ImageDecoder", func() {
 		})
 
 		It("should decode a ggs", func() {
-			decoder := GgsDecoder{}
+			decoder := GgsDecoder{"_slide0/geogebra_thumbnail.png"}
 			img, err := decoder.Convert(fileReader)
 			Expect(err).ToNot(HaveOccurred())
 			Expect(img).ToNot(BeNil())
 		})
 
 		It("should return an error if the ggs is invalid", func() {
-			decoder := GgsDecoder{}
+			decoder := GgsDecoder{"_slide0/geogebra_thumbnail.png"}
 			img, err := decoder.Convert(bytes.NewReader([]byte("not a ggs")))
 			Expect(err).To(HaveOccurred())
 			Expect(img).To(BeNil())

services/thumbnails/pkg/thumbnail/encoding.go

@@ -14,6 +14,7 @@ const (
 	typeJpeg = "jpeg"
 	typeGif  = "gif"
 	typeGgs  = "ggs"
+	typeGgp  = "ggp"
 )
 
 // Encoder encodes the thumbnail to a specific format.
@@ -52,7 +53,7 @@ func (e GifEncoder) MimeType() string {
 // or nil if the type is not supported.
 func EncoderForType(fileType string) (Encoder, error) {
 	switch strings.ToLower(fileType) {
-	case typePng, typeGgs:
+	case typePng, typeGgs, typeGgp:
 		return PngEncoder{}, nil
 	case typeJpg, typeJpeg:
 		return JpegEncoder{}, nil
@@ -71,6 +72,8 @@ func GetExtForMime(fileType string) string {
 		return ext
 	case "application/vnd.geogebra.slides":
 		return typeGgs
+	case "application/vnd.geogebra.pinboard":
+		return typeGgp
 	default:
 		return ""
 	}