add context partial user helper and accept a generic interface on SetUser - the same method now returns an error if the given value does not complete at least one method of the User interface

_examples/auth/jwt/refresh-token/main.go

@@ -28,6 +28,21 @@ type UserClaims struct {
 	Username string `json:"username"`
 }
 
+// GetID implements the partial context user's ID interface.
+// Note that if claims were a map then the claims value converted to UserClaims
+// and no need to implement any method.
+//
+// This is useful when multiple auth methods are used (e.g. basic auth, jwt)
+// but they all share a couple of methods.
+func (u *UserClaims) GetID() string {
+	return u.ID
+}
+
+// GetUsername implements the partial context user's Username interface.
+func (u *UserClaims) GetUsername() string {
+	return u.Username
+}
+
 // Validate completes the middleware's custom ClaimsValidator.
 // It will not accept a token which its claims missing the username field
 // (useful to not accept refresh tokens generated by the same algorithm).
@@ -58,8 +73,15 @@ func main() {
 		protectedAPI.Use(verifyMiddleware)
 
 		protectedAPI.Get("/", func(ctx iris.Context) {
-			claims := jwt.Get(ctx).(*UserClaims)
-			ctx.Writef("Username: %s\n", claims.Username)
+			// Access the claims through: jwt.Get:
+			// claims := jwt.Get(ctx).(*UserClaims)
+			// ctx.Writef("Username: %s\n", claims.Username)
+			//
+			// OR through context's user (if at least one method was implement by our UserClaims):
+			user := ctx.User()
+			id, _ := user.GetID()
+			username, _ := user.GetUsername()
+			ctx.Writef("ID: %s\nUsername: %s\n", id, username)
 		})
 	}