refactor: rename FcmOptions property and verify well formed uri

Author: Odonno

FirebaseAdmin/FirebaseAdmin.Tests/Messaging/MessageTest.cs

@@ -1572,7 +1572,7 @@ public void WebpushNotificationWithLinkUrl()
                         Body = "body",
                         Icon = "icon",
                     },
-                    Options = new WebpushFcmOptions()
+                    FcmOptions = new WebpushFcmOptions()
                     {
                         Link = "https://www.firebase.io/",
                     },
@@ -1618,7 +1618,7 @@ public void WebpushNotificationWithInvalidLinkUrl()
                         Body = "body",
                         Icon = "icon",
                     },
-                    Options = new WebpushFcmOptions()
+                    FcmOptions = new WebpushFcmOptions()
                     {
                         Link = "http://www.firebase.io/",
                     },

FirebaseAdmin/FirebaseAdmin/Messaging/WebpushConfig.cs

@@ -48,7 +48,7 @@ public sealed class WebpushConfig
         /// Gets or sets the Webpush options that will be included in the message.
         /// </summary>
         [JsonProperty("fcm_options")]
-        public WebpushFcmOptions Options { get; set; }
+        public WebpushFcmOptions FcmOptions { get; set; }
 
         /// <summary>
         /// Copies this Webpush config, and validates the content of it to ensure that it can be
@@ -61,7 +61,7 @@ internal WebpushConfig CopyAndValidate()
                 Headers = this.Headers?.Copy(),
                 Data = this.Data?.Copy(),
                 Notification = this.Notification?.CopyAndValidate(),
-                Options = this.Options?.CopyAndValidate(),
+                FcmOptions = this.FcmOptions?.CopyAndValidate(),
             };
         }
     }

FirebaseAdmin/FirebaseAdmin/Messaging/WebpushFcmOptions.cs

@@ -35,16 +35,16 @@ public sealed class WebpushFcmOptions
         /// </summary>
         internal WebpushFcmOptions CopyAndValidate()
         {
-            if (this.Link != null && !this.Link.StartsWith("https"))
-            {
-                throw new ArgumentException("The link options should be a valid https url.");
-            }
-
             var copy = new WebpushFcmOptions()
             {
                 Link = this.Link,
             };
 
+            if (copy.Link != null && Uri.IsWellFormedUriString(copy.Link, UriKind.Absolute) && !copy.Link.StartsWith("https"))
+            {
+                throw new ArgumentException("The link options should be a valid https url.");
+            }
+
             return copy;
         }
     }