Make no-cgo build work without source changes

no-cgo.go

@@ -0,0 +1,38 @@
+// mautrix-whatsapp - A Matrix-WhatsApp puppeting bridge.
+// Copyright (C) 2020 Tulir Asokan
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+// +build !cgo
+
+package main
+
+import (
+	"image"
+	"io"
+
+	"golang.org/x/image/webp"
+)
+
+func (bridge *Bridge) initCrypto() error {
+	if !bridge.Config.Bridge.Encryption.Allow {
+		bridge.Log.Warnln("Bridge built without end-to-bridge encryption, but encryption is enabled in config")
+	}
+	bridge.Log.Debugln("Bridge built without end-to-bridge encryption")
+	return nil
+}
+
+func decodeWebp(r io.Reader) (image.Image, error) {
+	return webp.Decode(r)
+}