# MongoDB integration

## Basic configuration

To configure OpenIddict to use MongoDB as the database for applications, authorizations, scopes and tokens, you'll need to:
  - **Reference the `OpenIddict.MongoDb` package**:

    ```xml
    <PackageReference Include="OpenIddict.MongoDb" Version="4.6.0" />
    ```

  - **Configure OpenIddict to use the MongoDB stores**:

    ```csharp
    services.AddOpenIddict()
        .AddCore(options =>
        {
            // Note: to use a remote server, call the MongoClient constructor overload
            // that accepts a connection string or an instance of MongoClientSettings.
            options.UseMongoDb()
                   .UseDatabase(new MongoClient().GetDatabase("openiddict"));
        });
    ```

    Alternatively, you can register the `IMongoDatabase` instance as a service:

    ```csharp
    services.AddOpenIddict()
        .AddCore(options =>
        {
            options.UseMongoDb();
        });

    // Note: to use a remote server, call the MongoClient constructor overload
    // that accepts a connection string or an instance of MongoClientSettings.
    services.AddSingleton(new MongoClient().GetDatabase("shared-database-instance"));
    ```

  - **Create indexes to improve performance** (recommended): for that, you can use the following script to
initialize the database and create the indexes used by the OpenIddict entities:

    ```csharp
    using System.Threading;
    using Microsoft.Extensions.DependencyInjection;
    using Microsoft.Extensions.Options;
    using MongoDB.Driver;
    using OpenIddict.MongoDb;
    using OpenIddict.MongoDb.Models;

    var services = new ServiceCollection();
    services.AddOpenIddict()
        .AddCore(options => options.UseMongoDb());

    services.AddSingleton(new MongoClient("mongodb://localhost:27017").GetDatabase("openiddict"));

    var provider = services.BuildServiceProvider();
    var context = provider.GetRequiredService<IOpenIddictMongoDbContext>();
    var options = provider.GetRequiredService<IOptionsMonitor<OpenIddictMongoDbOptions>>().CurrentValue;
    var database = await context.GetDatabaseAsync(CancellationToken.None);

    var applications = database.GetCollection<OpenIddictMongoDbApplication>(options.ApplicationsCollectionName);

    await applications.Indexes.CreateManyAsync(new[]
    {
        new CreateIndexModel<OpenIddictMongoDbApplication>(
            Builders<OpenIddictMongoDbApplication>.IndexKeys.Ascending(application => application.ClientId),
            new CreateIndexOptions
            {
                Unique = true
            }),

        new CreateIndexModel<OpenIddictMongoDbApplication>(
            Builders<OpenIddictMongoDbApplication>.IndexKeys.Ascending(application => application.PostLogoutRedirectUris),
            new CreateIndexOptions
            {
                Background = true
            }),

        new CreateIndexModel<OpenIddictMongoDbApplication>(
            Builders<OpenIddictMongoDbApplication>.IndexKeys.Ascending(application => application.RedirectUris),
            new CreateIndexOptions
            {
                Background = true
            })
    });

    var authorizations = database.GetCollection<OpenIddictMongoDbAuthorization>(options.AuthorizationsCollectionName);

    await authorizations.Indexes.CreateOneAsync(
        new CreateIndexModel<OpenIddictMongoDbAuthorization>(
            Builders<OpenIddictMongoDbAuthorization>.IndexKeys
                .Ascending(authorization => authorization.ApplicationId)
                .Ascending(authorization => authorization.Scopes)
                .Ascending(authorization => authorization.Status)
                .Ascending(authorization => authorization.Subject)
                .Ascending(authorization => authorization.Type),
            new CreateIndexOptions
            {
                Background = true
            }));

    var scopes = database.GetCollection<OpenIddictMongoDbScope>(options.ScopesCollectionName);

    await scopes.Indexes.CreateOneAsync(new CreateIndexModel<OpenIddictMongoDbScope>(
        Builders<OpenIddictMongoDbScope>.IndexKeys.Ascending(scope => scope.Name),
        new CreateIndexOptions
        {
            Unique = true
        }));

    var tokens = database.GetCollection<OpenIddictMongoDbToken>(options.TokensCollectionName);

    await tokens.Indexes.CreateManyAsync(new[]
    {
        new CreateIndexModel<OpenIddictMongoDbToken>(
            Builders<OpenIddictMongoDbToken>.IndexKeys.Ascending(token => token.ReferenceId),
            new CreateIndexOptions<OpenIddictMongoDbToken>
            {
                // Note: partial filter expressions are not supported on Azure Cosmos DB.
                // As a workaround, the expression and the unique constraint can be removed.
                PartialFilterExpression = Builders<OpenIddictMongoDbToken>.Filter.Exists(token => token.ReferenceId),
                Unique = true
            }),

        new CreateIndexModel<OpenIddictMongoDbToken>(
            Builders<OpenIddictMongoDbToken>.IndexKeys
                .Ascending(token => token.ApplicationId)
                .Ascending(token => token.Status)
                .Ascending(token => token.Subject)
                .Ascending(token => token.Type),
            new CreateIndexOptions
            {
                Background = true
            })
    });
    ```

## Advanced configuration

### Use custom entities

For applications that require storing additional data alongside the properties used by OpenIddict, custom entities can be used. For that, you need to:
  - **Create custom entities**:

    ```csharp
    public class CustomApplication : OpenIddictMongoDbApplication
    {
        public string CustomProperty { get; set; }
    }

    public class CustomAuthorization : OpenIddictMongoDbAuthorization
    {
        public string CustomProperty { get; set; }
    }

    public class CustomScope : OpenIddictMongoDbScope
    {
        public string CustomProperty { get; set; }
    }

    public class CustomToken : OpenIddictMongoDbToken
    {
        public string CustomProperty { get; set; }
    }
    ```

  - **Configure MongoDb to use the custom entities**:

    ```csharp
    services.AddOpenIddict()
        .AddCore(options =>
        {
            options.UseMongoDb()
                   .ReplaceDefaultApplicationEntity<CustomApplication>()
                   .ReplaceDefaultAuthorizationEntity<CustomAuthorization>()
                   .ReplaceDefaultScopeEntity<CustomScope>()
                   .ReplaceDefaultTokenEntity<CustomToken>();
        });
    ```

### Use custom collection names

By default, OpenIddict uses the `openiddict.[entity name]s` pattern to determine the default collection names.
Applications that require using different collection names can use the `Set*CollectionName()` helpers:

```csharp
services.AddOpenIddict()
    .AddCore(options =>
    {
        options.UseMongoDb()
               .SetApplicationsCollectionName("custom-applications-collection")
               .SetAuthorizationsCollectionName("custom-authorizations-collection")
               .SetScopesCollectionName("custom-scopes-collection")
               .SetTokensCollectionName("custom-tokens-collection");
    });
```