SignalR Service input binding for Azure Functions

Before a client can connect to Azure SignalR Service, it must retrieve the service endpoint URL and a valid access token. The SignalRConnectionInfo input binding produces the SignalR Service endpoint URL and a valid token that are used to connect to the service. Because the token is time-limited and can be used to authenticate a specific user to a connection, you should not cache the token or share it between clients. An HTTP trigger using this binding can be used by clients to retrieve the connection information.

For more information on how this binding is used to create a "negotiate" function that can be consumed by a SignalR client SDK, see the Azure Functions development and configuration article in the SignalR Service concepts documentation.

For information on setup and configuration details, see the overview.

Example

The following example shows a C# function that acquires SignalR connection information using the input binding and returns it over HTTP.

[FunctionName("negotiate")]
public static SignalRConnectionInfo Negotiate(
    [HttpTrigger(AuthorizationLevel.Anonymous)]HttpRequest req,
    [SignalRConnectionInfo(HubName = "chat")]SignalRConnectionInfo connectionInfo)
{
    return connectionInfo;
}

Authenticated tokens

If the function is triggered by an authenticated client, you can add a user ID claim to the generated token. You can easily add authentication to a function app using App Service Authentication.

App Service Authentication sets HTTP headers named x-ms-client-principal-id and x-ms-client-principal-name that contain the authenticated user's client principal ID and name, respectively.

You can set the UserId property of the binding to the value from either header using a binding expression: {headers.x-ms-client-principal-id} or {headers.x-ms-client-principal-name}.

[FunctionName("negotiate")]
public static SignalRConnectionInfo Negotiate(
    [HttpTrigger(AuthorizationLevel.Anonymous)]HttpRequest req, 
    [SignalRConnectionInfo
        (HubName = "chat", UserId = "{headers.x-ms-client-principal-id}")]
        SignalRConnectionInfo connectionInfo)
{
    // connectionInfo contains an access key token with a name identifier claim set to the authenticated user
    return connectionInfo;
}

Next steps