Add content type assertion fallback for JSON file imports

compose/service/import_session.go

@@ -84,7 +84,7 @@ func (svc *importSession) Create(ctx context.Context, f io.ReadSeeker, name, con
 		}
 
 		f.Seek(0, 0)
-		if jd.CanDecodeFile(f) {
+		if jd.CanDecodeFile(f) || jd.CanDecodeMime(contentType) {
 			f.Seek(0, 0)
 			return jd.Decode(ctx, f, do)
 		}

pkg/envoy/json/decoder.go

@@ -48,6 +48,10 @@ func (d *decoder) CanDecodeFile(f io.Reader) bool {
 	return d.CanDecodeExt(ext)
 }
 
+func (d *decoder) CanDecodeMime(m string) bool {
+	return m == "application/json" || m == "application/jsonlines"
+}
+
 func (d *decoder) CanDecodeExt(ext string) bool {
 	pt := strings.Split(ext, ".")
 	ext = strings.TrimSpace(pt[len(pt)-1])