Peer invitation refactor, Contact invitationId, Qrcode compression

contactcard.go

@@ -3,7 +3,6 @@ package meowlib
 import (
 	"bytes"
 	"compress/gzip"
-	"encoding/json"
 	"fmt"
 	"image"
 	"image/color"
@@ -96,13 +95,14 @@ func (contact *ContactCard) WritePng(filename string) {
 }
 
 func (Contact *ContactCard) WriteQr(filename string) {
-	jsonContact, _ := json.Marshal(Contact)
+	//jsonContact, _ := json.Marshal(Contact)
+	jsonContact, _ := Contact.Compress()
 	qwriter := qrcode.NewQRCodeWriter()
 	code, err := qwriter.Encode(string(jsonContact), gozxing.BarcodeFormat_QR_CODE, 512, 512, nil)
 	if err != nil {
 		println(err.Error())
 	}
-	file, _ := os.Create("barcode.png")
+	file, _ := os.Create(filename)
 	defer file.Close()
 
 	// *BitMatrix implements the image.Image interface,