Add `Configuring-OpenIddict.md`

docs/en/Deployment/Configuring-OpenIddict.md

@@ -0,0 +1,62 @@
+# Configuring OpenIddict
+
+This document introduces how to configure `OpenIddict` in the `AuthServer` project.
+
+There are different configurations in the `AuthServer` project for `Development` and `Production` environment.
+
+````csharp
+public override void PreConfigureServices(ServiceConfigurationContext context)
+{
+    var hostingEnvironment = context.Services.GetHostingEnvironment();
+
+    // Development environment
+    if (hostingEnvironment.IsDevelopment())
+    {
+        PreConfigure<AbpOpenIddictAspNetCoreOptions>(options =>
+        {
+            // This is default value, you can remove this line.
+            options.AddDevelopmentEncryptionAndSigningCertificate = true;
+        });
+    }
+
+    // Production or Staging environment
+    if (!hostingEnvironment.IsDevelopment())
+    {
+        PreConfigure<AbpOpenIddictAspNetCoreOptions>(options =>
+        {
+            options.AddDevelopmentEncryptionAndSigningCertificate = false;
+        });
+
+        PreConfigure<OpenIddictServerBuilder>(builder =>
+        {
+            builder.AddSigningCertificate(GetSigningCertificate(hostingEnvironment));
+            builder.AddEncryptionCertificate(GetSigningCertificate(hostingEnvironment));
+
+            //...
+        });
+    }
+}
+
+private X509Certificate2 GetSigningCertificate(IWebHostEnvironment hostingEnv)
+{
+    return new X509Certificate2(Path.Combine(hostingEnv.ContentRootPath, "authserver.pfx"), "00000000-0000-0000-0000-000000000000");
+}
+````
+
+## Development Environment
+
+We enabled `AddDevelopmentEncryptionAndSigningCertificate` by default on development environment, It will registers (and generates if necessary) a user-specific development encryption/development signing certificate. This is a certificate used for signing and encrypting the tokens and for **development environment only**.
+
+`AddDevelopmentEncryptionAndSigningCertificate` cannot be used in applications deployed on IIS or Azure App Service: trying to use them on IIS or Azure App Service will result in an exception being thrown at runtime (unless the application pool is configured to [load a user profile](https://learn.microsoft.com/en-us/iis/manage/configuring-security/application-pool-identities#user-profile)). 
+
+To avoid that, consider creating self-signed certificates and storing them in the X.509 certificates store of the host machine(s). This is the way we use in production environment.
+
+## Production Environment
+
+We disabled `AddDevelopmentEncryptionAndSigningCertificate` in production environment and tried to setup signing and encrypting certificates using `authserver.pfx`.
+
+You can use `dotnet dev-certs https -v -ep authserver.pfx -p 00000000-0000-0000-0000-000000000000` command to generate the `authserver.pfx` certificate.
+
+> `00000000-0000-0000-0000-000000000000` is the password of the certificate, you can change it to any password you want.
+
+>  Please also remember to copy `authserver.pfx` to the [Content Root Folder](https://learn.microsoft.com/en-us/dotnet/api/microsoft.aspnetcore.hosting.ihostingenvironment.contentrootpath?view=aspnetcore-7.0) of the `AuthServer` website.

docs/en/Deployment/Index.md

@@ -6,6 +6,7 @@ However, there are some topics that you should care about when you are deploying
 
 ## Guides
 
+* [Configuring for OpenIddict](Configuring-OpenIddict.md): Notes for some essential configurations for OpenIddict.
 * [Configuring for Production](Configuring-Production.md): Notes for some essential configurations for production environments.
 * [Optimization for Production](Optimizing-Production.md): Tips and suggestions for optimizing your application on production environments.
 * [Deploying to a Clustered Environment](Clustered-Environment.md): Explains how to configure your application when you want to run multiple instances of your application concurrently.

docs/en/docs-nav.json

@@ -1397,7 +1397,7 @@
             }
           ]
         },
-		{
+        {
           "text": "OpenIddict",
           "items": [
             {
@@ -1493,4 +1493,4 @@
       "path": "Contribution/Index.md"
     }
   ]
-}
+}