Update Facebook API to 4.0 #4684 (#14798)

Author: Tratcher

src/Security/Authentication/Facebook/src/FacebookDefaults.cs

@@ -10,10 +10,10 @@ public static class FacebookDefaults
         public static readonly string DisplayName = "Facebook";
 
         // https://developers.facebook.com/docs/facebook-login/manually-build-a-login-flow#login
-        public static readonly string AuthorizationEndpoint = "https://www.facebook.com/v3.3/dialog/oauth";
+        public static readonly string AuthorizationEndpoint = "https://www.facebook.com/v4.0/dialog/oauth";
 
-        public static readonly string TokenEndpoint = "https://graph.facebook.com/v3.3/oauth/access_token";
+        public static readonly string TokenEndpoint = "https://graph.facebook.com/v4.0/oauth/access_token";
 
-        public static readonly string UserInformationEndpoint = "https://graph.facebook.com/v3.3/me";
+        public static readonly string UserInformationEndpoint = "https://graph.facebook.com/v4.0/me";
     }
 }

src/Security/Authentication/test/FacebookTests.cs

@@ -225,7 +225,7 @@ public async Task NestedMapWillNotAffectRedirect()
             var transaction = await server.SendAsync("http://example.com/base/login");
             Assert.Equal(HttpStatusCode.Redirect, transaction.Response.StatusCode);
             var location = transaction.Response.Headers.Location.AbsoluteUri;
-            Assert.Contains("https://www.facebook.com/v3.3/dialog/oauth", location);
+            Assert.Contains("https://www.facebook.com/v4.0/dialog/oauth", location);
             Assert.Contains("response_type=code", location);
             Assert.Contains("client_id=", location);
             Assert.Contains("redirect_uri=" + UrlEncoder.Default.Encode("http://example.com/base/signin-facebook"), location);
@@ -257,7 +257,7 @@ public async Task MapWillNotAffectRedirect()
             var transaction = await server.SendAsync("http://example.com/login");
             Assert.Equal(HttpStatusCode.Redirect, transaction.Response.StatusCode);
             var location = transaction.Response.Headers.Location.AbsoluteUri;
-            Assert.Contains("https://www.facebook.com/v3.3/dialog/oauth", location);
+            Assert.Contains("https://www.facebook.com/v4.0/dialog/oauth", location);
             Assert.Contains("response_type=code", location);
             Assert.Contains("client_id=", location);
             Assert.Contains("redirect_uri=" + UrlEncoder.Default.Encode("http://example.com/signin-facebook"), location);
@@ -291,7 +291,7 @@ public async Task ChallengeWillTriggerRedirection()
             var transaction = await server.SendAsync("http://example.com/challenge");
             Assert.Equal(HttpStatusCode.Redirect, transaction.Response.StatusCode);
             var location = transaction.Response.Headers.Location.AbsoluteUri;
-            Assert.Contains("https://www.facebook.com/v3.3/dialog/oauth", location);
+            Assert.Contains("https://www.facebook.com/v4.0/dialog/oauth", location);
             Assert.Contains("response_type=code", location);
             Assert.Contains("client_id=", location);
             Assert.Contains("redirect_uri=", location);