Allow Entra authentication when connecting to Redis

[pharring]

Why make this change?

So you can use an Azure Managed Redis or Azure Cache for Redis instance with Entra authentication as a level 2 cache.

What is this change?

If the Redis connection string does not include a password and you are NOT connecting to localhost, then we assume you are connecting to an instance that requires Entra authentication. In that case, we use the DefaultAzureCredential (managed identity) to connect.

How was this tested?

Tested manually and ran unit tests.

Sample Request(s)

N/A

[Copilot]

Pull request overview

This PR adds support for Azure Entra authentication when connecting to Azure Managed Redis or Azure Cache for Redis instances. The implementation automatically detects when Entra authentication should be used based on whether a password is present in the connection string and whether the endpoint is localhost.

Changes:

• Added new CreateConnectionMultiplexerAsync method that handles both traditional password-based and Entra-based Redis authentication
• Added Microsoft.Azure.StackExchangeRedis package to enable Azure-specific Redis features
• Updated Azure.Identity and Microsoft.Extensions.Configuration.Binder package versions

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
src/Service/Startup.cs	Added CreateConnectionMultiplexerAsync method with Entra authentication support and localhost detection logic
src/Service/Azure.DataApiBuilder.Service.csproj	Added Microsoft.Azure.StackExchangeRedis package reference
src/Directory.Packages.props	Updated Azure.Identity to 1.17.1, Microsoft.Extensions.Configuration.Binder to 8.0.2, and added Microsoft.Azure.StackExchangeRedis 3.3.1

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[Aniruddh25]

/azp run

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Azure Pipelines successfully started running 6 pipeline(s).

[Aniruddh25]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 6 pipeline(s).

[souvikghosh04]

Added some review comments. also, it would be good to mention how this was tested as I don't see any supporting tests for the change. having test coverage with different scenarios would be great.

[Aniruddh25]

/azp run

[Aniruddh25]

LGTM, thank you for these contributions :)

[azure-pipelines]

Azure Pipelines successfully started running 6 pipeline(s).

[Aniruddh25]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 6 pipeline(s).

[pharring]

I'm investigating the unit test failure(s). The response message says the audience is "null" instead of BAD_AUDIENCE. Possibly caused by the Azure.Identity version bump (perhaps the latest MSAL obscures the audience name).

[souvikghosh04]

/azp run

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Azure Pipelines successfully started running 6 pipeline(s).

[Aniruddh25]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 6 pipeline(s).

[Aniruddh25]

@copilot: can you fix the following formatting issues:

/home/vsts/work/1/s/src/Service/Startup.cs(155,151): error WHITESPACE: Fix whitespace formatting. Replace 25 characters with '\n\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s'. [/home/vsts/work/1/s/src/Service/Azure.DataApiBuilder.Service.csproj]
/home/vsts/work/1/s/src/Service/Startup.cs(156,73): error WHITESPACE: Fix whitespace formatting. Replace 25 characters with '\n\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s'. [/home/vsts/work/1/s/src/Service/Azure.DataApiBuilder.Service.csproj]
/home/vsts/work/1/s/src/Service/Startup.cs(157,118): error WHITESPACE: Fix whitespace formatting. Replace 25 characters with '\n\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s'. [/home/vsts/work/1/s/src/Service/Azure.DataApiBuilder.Service.csproj]
/home/vsts/work/1/s/src/Service/Startup.cs(158,60): error WHITESPACE: Fix whitespace formatting. Replace 25 characters with '\n\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s'. [/home/vsts/work/1/s/src/Service/Azure.DataApiBuilder.Service.csproj]
/home/vsts/work/1/s/src/Service/Startup.cs(170,56): error WHITESPACE: Fix whitespace formatting. Replace 25 characters with '\n\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s'. [/home/vsts/work/1/s/src/Service/Azure.DataApiBuilder.Service.csproj]
/home/vsts/work/1/s/src/Service/Startup.cs(171,72): error WHITESPACE: Fix whitespace formatting. Replace 25 characters with '\n\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s'. [/home/vsts/work/1/s/src/Service/Azure.DataApiBuilder.Service.csproj]
/home/vsts/work/1/s/src/Service/Startup.cs(172,118): error WHITESPACE: Fix whitespace formatting. Replace 25 characters with '\n\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s'. [/home/vsts/work/1/s/src/Service/Azure.DataApiBuilder.Service.csproj]
/home/vsts/work/1/s/src/Service/Startup.cs(173,60): error WHITESPACE: Fix whitespace formatting. Replace 25 characters with '\n\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s'. [/home/vsts/work/1/s/src/Service/Azure.DataApiBuilder.Service.csproj]
/home/vsts/work/1/s/src/Service/Startup.cs(517,1): error WHITESPACE: Fix whitespace formatting. Replace 15 characters with '\n\s\s\s\s\s\s\s\s'. [/home/vsts/work/1/s/src/Service/Azure.DataApiBuilder.Service.csproj]
/home/vsts/work/1/s/src/Service/Startup.cs(523,1): error WHITESPACE: Fix whitespace formatting. Replace 8 characters with '\s\s\s\s\s\s\s\s'. [/home/vsts/work/1/s/src/Service/Azure.DataApiBuilder.Service.csproj]
/home/vsts/work/1/s/src/Service/Startup.cs(635,19): error WHITESPACE: Fix whitespace formatting. Replace 17 characters with '\n\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s'. [/home/vsts/work/1/s/src/Service/Azure.DataApiBuilder.Service.csproj]
/home/vsts/work/1/s/src/Service/Startup.cs(636,83): error WHITESPACE: Fix whitespace formatting. Replace 17 characters with '\n\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s'. [/home/vsts/work/1/s/src/Service/Azure.DataApiBuilder.Service.csproj]
/home/vsts/work/1/s/src/Service/Startup.cs(637,82): error WHITESPACE: Fix whitespace formatting. Replace 17 characters with '\n\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s'. [/home/vsts/work/1/s/src/Service/Azure.DataApiBuilder.Service.csproj]
/home/vsts/work/1/s/src/Service/Startup.cs(638,90): error WHITESPACE: Fix whitespace formatting. Replace 17 characters with '\n\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s\s'. [/home/vsts/work/1/s/src/Service/Azure.DataApiBuilder.Service.csproj]

[Aniruddh25]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 6 pipeline(s).