auto-sign thumbnails

processor.go

@@ -2,12 +2,14 @@ package imagorvideoextended
 
 import (
 	"context"
+	"crypto/sha256"
 	"github.com/antchfx/htmlquery"
 	"github.com/cshum/imagor"
 	"github.com/cshum/imagor/imagorpath"
 	"github.com/gabriel-vasile/mimetype"
 	"go.uber.org/zap"
 	"io"
+	"os"
 	"strings"
 )
 
@@ -39,6 +41,18 @@ func (p *Processor) Shutdown(_ context.Context) error {
 	return nil
 }
 
+func subThumbnail(url string) string {
+	key := os.Getenv("IMAGOR_SECRET")
+	params := imagorpath.Params{
+		Image:  url,
+		FitIn:  true,
+		Width:  400,
+		Height: 400,
+	}
+	path := imagorpath.Generate(params, imagorpath.NewHMACSigner(sha256.New, 0, key))
+	return path
+}
+
 // Process implements imagor.Processor interface
 func (p *Processor) Process(ctx context.Context, in *imagor.Blob, params imagorpath.Params, load imagor.LoadFunc) (out *imagor.Blob, err error) {
 	defer func() {
@@ -57,6 +71,7 @@ func (p *Processor) Process(ctx context.Context, in *imagor.Blob, params imagorp
 			}
 		}
 	}()
+
 	var mime = mimetype.Detect(in.Sniff())
 
 	if typ := mime.String(); !strings.HasPrefix(typ, "text/html") {
@@ -103,7 +118,7 @@ func (p *Processor) Process(ctx context.Context, in *imagor.Blob, params imagorp
 		case "og:image":
 			fallthrough
 		case "twitter:image:src":
-			meta.Image = val
+			meta.Image = subThumbnail(val)
 			break
 
 		case "og:title":