Update the Reddit integration to support the duration parameter

sandbox/OpenIddict.Sandbox.AspNetCore.Client/Startup.cs

@@ -147,7 +147,8 @@ public class Startup
                        {
                            options.SetClientId("vDLNqhrkwrvqHgnoBWF3og")
                                   .SetClientSecret("Tpab28Dz0upyZLqn7AN3GFD1O-zaAw")
-                                  .SetRedirectUri("https://localhost:44381/callback/login/reddit");
+                                  .SetRedirectUri("https://localhost:44381/callback/login/reddit")
+                                  .SetDuration("permanent");
                        })
                        .UseTwitter(options =>
                        {

src/OpenIddict.Client.WebIntegration/OpenIddictClientWebIntegrationHandlers.cs

@@ -545,6 +545,13 @@ public static partial class OpenIddictClientWebIntegrationHandlers
                 context.Request["access_type"] = options.AccessType;
             }
 
+            else if (context.Registration.ProviderName is Providers.Reddit)
+            {
+                var options = context.Registration.GetRedditOptions();
+
+                context.Request["duration"] = options.Duration;
+            }
+
             return default;
         }
     }

src/OpenIddict.Client.WebIntegration/OpenIddictClientWebIntegrationProviders.xml

@@ -125,6 +125,9 @@
       <Configuration AuthorizationEndpoint="https://www.reddit.com/api/v1/authorize"
                      TokenEndpoint="https://www.reddit.com/api/v1/access_token"
                      UserinfoEndpoint="https://oauth.reddit.com/api/v1/me">
+        <GrantType Value="authorization_code" />
+        <GrantType Value="refresh_token" />
+
         <TokenEndpointAuthMethod Value="client_secret_basic" />
       </Configuration>
 
@@ -137,6 +140,9 @@
 
       <Scope Name="identity" Default="true" Required="true" />
     </Environment>
+
+    <Setting PropertyName="Duration" ParameterName="duration" Type="String" Required="false"
+             Description="The value used as the 'duration' parameter (can be set to 'permanent' to retrieve a refresh token)" />
   </Provider>
 
   <Provider Name="StackExchange" Documentation="https://api.stackexchange.com/docs/authentication">