From e15ef936212a444234ca3badced78d2fdb0784b4 Mon Sep 17 00:00:00 2001
From: "Collin M. Barrett" <collinbarrett@users.noreply.github.com>
Date: Tue, 21 Aug 2018 06:38:16 -0500
Subject: [PATCH] add url validation to SnapshotService

---
 src/FilterLists.Services/Snapshot/Snapshot.cs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/FilterLists.Services/Snapshot/Snapshot.cs b/src/FilterLists.Services/Snapshot/Snapshot.cs
index e710a756b..f4123a524 100644
--- a/src/FilterLists.Services/Snapshot/Snapshot.cs
+++ b/src/FilterLists.Services/Snapshot/Snapshot.cs
@@ -42,6 +42,8 @@ public Snapshot(FilterListsDbContext dbContext, EmailService emailService, Filte
         public async Task TrySaveAsync()
         {
             await AddSnapEntity();
+            if (!IsViewUrlValid())
+                return;
             try
             {
                 await SaveAsync();
@@ -57,6 +59,10 @@ private async Task AddSnapEntity()
             dbContext.Snapshots.Add(snapEntity);
             await dbContext.SaveChangesAsync();
         }
+        
+        private bool IsViewUrlValid() =>
+            Uri.TryCreate(list.ViewUrl, UriKind.Absolute, out var uriResult) &&
+            (uriResult.Scheme == Uri.UriSchemeHttp || uriResult.Scheme == Uri.UriSchemeHttps);
 
         private async Task SaveAsync()
         {