fix: allow webp thumbnails (#758)

* use webp as thumbnail

* simpler way to use webp

---------

Co-authored-by: Felipe Martin <812088+fmartingr@users.noreply.github.com>

go.mod

@@ -34,6 +34,7 @@ require (
 	github.com/swaggo/swag v1.16.2
 	github.com/toorop/gin-logrus v0.0.0-20210225092905-2c785434f26f
 	golang.org/x/crypto v0.13.0
+	golang.org/x/image v0.12.0
 	golang.org/x/net v0.15.0
 	golang.org/x/term v0.12.0
 	modernc.org/sqlite v1.26.0
@@ -86,7 +87,6 @@ require (
 	go.etcd.io/bbolt v1.3.7 // indirect
 	go.uber.org/atomic v1.11.0 // indirect
 	golang.org/x/arch v0.5.0 // indirect
-	golang.org/x/image v0.12.0 // indirect
 	golang.org/x/mod v0.12.0 // indirect
 	golang.org/x/sys v0.12.0 // indirect
 	golang.org/x/text v0.13.0 // indirect

internal/core/processing.go

@@ -21,6 +21,7 @@ import (
 	"github.com/go-shiori/shiori/internal/model"
 	"github.com/go-shiori/warc"
 	"github.com/pkg/errors"
+	_ "golang.org/x/image/webp"
 
 	// Add support for png
 	_ "image/png"
@@ -204,6 +205,7 @@ func DownloadBookImage(url, dstPath string) error {
 	if !strings.Contains(cp, "image/jpeg") &&
 		!strings.Contains(cp, "image/pjpeg") &&
 		!strings.Contains(cp, "image/jpg") &&
+		!strings.Contains(cp, "image/webp") &&
 		!strings.Contains(cp, "image/png") {
 		return ErrNoSupportedImageType
 	}