fix: outbound didcomm v2 messages always have 'body' and 'from' fields (#3209)

Signed-off-by: Filip Burlacu <[email protected]>

Author: Moopli

pkg/didcomm/common/middleware/middleware.go

@@ -77,6 +77,7 @@ type rotatePayload struct {
 const (
 	fromPriorJSONKey  = "from_prior"
 	fromDIDJSONKey    = "from"
+	bodyJSONKey       = "body"
 	initialStateParam = "initialState"
 )
 
@@ -160,6 +161,16 @@ func (h *DIDCommMessageMiddleware) HandleOutboundMessage(msg didcomm.DIDCommMsgM
 		return msg
 	}
 
+	// if there's no from DID, add a from DID.
+	if _, ok := msg[fromDIDJSONKey]; !ok {
+		msg[fromDIDJSONKey] = rec.MyDID
+	}
+
+	// if there's no body, add a body.
+	if _, ok := msg[bodyJSONKey]; !ok {
+		msg[bodyJSONKey] = map[string]interface{}{}
+	}
+
 	if rec.MyDIDRotation != nil {
 		msg[fromPriorJSONKey] = rec.MyDIDRotation.FromPrior
 	}