Add Managed Identity Support

[AndyOHart]

PR Summary: Add Managed Identity Support

Branch: andyohart/managed-identity
Merging into: main

Overview

This PR introduces Managed Identity support to the Microsoft Authentication Library for Go through a new client. The new client supports multiple sources for managed identities, including:

• IMDS
• Azure Arc
• Service Fabric
• App Service
• Azure Machine Learning
• Cloud Shell

The client can handle both System Assigned Managed Identities and User Assigned Managed Identities.
For user-assigned identities, you can specify:

• Client ID
• Resource ID
• Object ID

Key Changes

• New Managed Identity Client: Added a new client to handle managed identity authentication.
• Multiple Sources Support: The client supports various managed identity sources, enhancing flexibility and usability.
• Tests: Comprehensive tests have been added to ensure the reliability and correctness of the new functionality.
• Documentation: Updated documentation to include details on the new managed identity client and usage instructions.

Code Sample

Here's a basic example of how to use the new managed identity client to acquire a token:

package main

import (
    "context"
    "fmt"
    "github.com/AzureAD/microsoft-authentication-library-for-go/msal"
)

func main() {
	miSystemAssigned, err := mi.New(mi.SystemAssigned())
	if err != nil {
		log.Fatal(err)
	}
	result, err := miSystemAssigned.AcquireToken(context.TODO(), "https://management.azure.com")
	if err != nil {
		log.Fatal(err)
	}
	fmt.Println("token expire at : ", result.ExpiresOn)
}

[sonarqubecloud]

Quality Gate failed

Failed conditions
2 Security Hotspots

See analysis details on SonarQube Cloud