Add PinHandler interface to keyshare and manager api

keyshare.go

@@ -17,7 +17,7 @@ import (
 
 // KeysharePinRequestor is used to asking the user for his PIN.
 type KeysharePinRequestor interface {
-	RequestPin(remainingAttempts int, callback func(proceed bool, pin string))
+	RequestPin(remainingAttempts int, callback PinHandler)
 }
 
 type keyshareSessionHandler interface {
@@ -203,7 +203,7 @@ func startKeyshareSession(
 // Ask for a pin, repeatedly if necessary, and either continue the keyshare protocol
 // with authorization, or stop the keyshare protocol and inform of failure.
 func (ks *keyshareSession) VerifyPin(attempts int) {
-	ks.pinRequestor.RequestPin(attempts, func(proceed bool, pin string) {
+	ks.pinRequestor.RequestPin(attempts, PinHandler(func(proceed bool, pin string) {
 		success, attemptsRemaining, blocked, err := ks.verifyPinAttempt(pin)
 		if err != nil {
 			ks.sessionHandler.KeyshareError(err)
@@ -222,7 +222,7 @@ func (ks *keyshareSession) VerifyPin(attempts int) {
 		}
 		// Not successful but no error and not yet blocked: try again
 		ks.VerifyPin(attemptsRemaining)
-	})
+	}))
 }
 
 // Verify the specified pin at each of the keyshare servers involved in the specified session.

session.go

@@ -17,6 +17,8 @@ import (
 // and specifying the attributes to be disclosed.
 type PermissionHandler func(proceed bool, choice *DisclosureChoice)
 
+type PinHandler func(proceed bool, pin string)
+
 // A Handler contains callbacks for communication to the user.
 type Handler interface {
 	StatusUpdate(action Action, status Status)
@@ -31,7 +33,7 @@ type Handler interface {
 	RequestSignaturePermission(request SignatureRequest, ServerName string, callback PermissionHandler)
 	RequestSchemeManagerPermission(manager *SchemeManager, callback func(proceed bool))
 
-	RequestPin(remainingAttempts int, callback func(proceed bool, pin string))
+	RequestPin(remainingAttempts int, callback PinHandler)
 }
 
 // A session is an IRMA session.

session_test.go

@@ -69,7 +69,7 @@ func (th TestHandler) RequestSignaturePermission(request SignatureRequest, Serve
 func (th TestHandler) RequestSchemeManagerPermission(manager *SchemeManager, callback func(proceed bool)) {
 	callback(true)
 }
-func (th TestHandler) RequestPin(remainingAttempts int, callback func(proceed bool, pin string)) {
+func (th TestHandler) RequestPin(remainingAttempts int, callback PinHandler) {
 	callback(true, "12345")
 }