To avoid a situation where a user has to sign in twice for Azure Functions with and without SignalR, you can set up your Azure Functions and SignalR to share the same authentication mechanism. This can be achieved by using Azure AD authentication for both your Azure Functions and SignalR endpoints, and then using the acquired authentication token for accessing both resources. Here's how you can approach this:
1. **Azure AD Authentication for Azure Functions (with and without SignalR):**
- Configure your Azure Functions app to use Azure AD authentication as you've described for Azure Functions without SignalR.
- For Azure Functions with SignalR, you can follow the authentication routine you mentioned for authorizing requests to SignalR resources with Azure AD.
2. **Client-Side Authentication:**
- In your client app (e.g., .NET MAUI), authenticate the user using Azure AD once, and obtain an access token.
3. **Accessing Azure Functions (Non-SignalR) from Client:**
- When invoking Azure Functions (non-SignalR) from your client app, you can include the Azure AD access token in the `Authorization` header of the HTTP request. This token should grant access to both Azure Functions with and without SignalR.
4. **Accessing Azure Functions with SignalR from Client:**
- For invoking Azure Functions with SignalR, you can set up a SignalR connection and use the same Azure AD access token obtained during the initial authentication. You should attach the access token as a bearer token in the `Authorization` header of the HubConnection.
By using the same access token for both Azure Functions and SignalR, you ensure that the user is authenticated seamlessly across both resources, and they won't need to sign in again visually. The key is to manage the token correctly and pass it to the respective resources.
Remember that managing access tokens securely is crucial, and you should ensure that tokens are refreshed as needed and properly secured in your client app. Additionally, make sure to configure your Azure AD app registration with the necessary permissions for both Azure Functions and SignalR resources.