rootcastleco/rei-skills/azure-identity-ts

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Authenticate to Azure services using Azure Identity SDK for JavaScript (@azure/identity). Use when configuring authentication with DefaultAzureCredential, managed identity, service principals, or i...

Install

npx vskill@latest install rootcastleco/rei-skills/azure-identity-ts

SKILL.md

Azure Identity SDK for TypeScript

Authenticate to Azure services with various credential types.

Installation

bash
npm install @azure/identity

Environment Variables

Service Principal (Secret)
bash
AZURE_TENANT_ID=<tenant-id>
AZURE_CLIENT_ID=<client-id>
AZURE_CLIENT_SECRET=<client-secret>
Service Principal (Certificate)
bash
AZURE_TENANT_ID=<tenant-id>
AZURE_CLIENT_ID=<client-id>
AZURE_CLIENT_CERTIFICATE_PATH=/path/to/cert.pem
AZURE_CLIENT_CERTIFICATE_PASSWORD=<optional-password>
Workload Identity (Kubernetes)
bash
AZURE_TENANT_ID=<tenant-id>
AZURE_CLIENT_ID=<client-id>
AZURE_FEDERATED_TOKEN_FILE=/var/run/secrets/tokens/azure-identity

DefaultAzureCredential (Recommended)

typescript
import { DefaultAzureCredential } from "@azure/identity";
const credential = new DefaultAzureCredential();
// Use with any Azure SDK client
import { BlobServiceClient } from "@azure/storage-blob";
const blobClient = new BlobServiceClient(
"https://<account>.blob.core.windows.net",
credential
);

Credential Chain Order:

  1. EnvironmentCredential
  2. WorkloadIdentityCredential
  3. ManagedIdentityCredential
  4. VisualStudioCodeCredential
  5. AzureCliCredential
  6. AzurePowerShellCredential
  7. AzureDeveloperCliCredential

Managed Identity

System-Assigned
typescript
import { ManagedIdentityCredential } from "@azure/identity";
const credential = new ManagedIdentityCredential();
User-Assigned (by Client ID)
typescript
const credential = new ManagedIdentityCredential({
clientId: "<user-assigned-client-id>"
});
User-Assigned (by Resource ID)
typescript
const credential = new ManagedIdentityCredential({
resourceId: "/subscriptions/<sub>/resourceGroups/<rg>/providers/Microsoft.ManagedIdentity/userAssignedIdentities/<name>"
});

Service Principal

Client Secret
typescript
import { ClientSecretCredential } from "@azure/identity";
const credential = new ClientSecretCredential(
"<tenant-id>",
"<client-id>",
"<client-secret>"
);
Client Certificate
typescript
import { ClientCertificateCredential } from "@azure/identity";
const credential = new ClientCertificateCredential(
"<tenant-id>",
"<client-id>",
{ certificatePath: "/path/to/cert.pem" }
);
// With password
const credentialWithPwd = new ClientCertificateCredential(
"<tenant-id>",
"<client-id>",
{
certificatePath: "/path/to/cert.pem",
certificatePassword: "<password>"
}
);

Interactive Authentication

Browser-Based Login
typescript
import { InteractiveBrowserCredential } from "@azure/identity";
const credential = new InteractiveBrowserCredential({
clientId: "<client-id>",
tenantId: "<tenant-id>",
loginHint: "user@example.com"
});
Device Code Flow
typescript
import { DeviceCodeCredential } from "@azure/identity";
const credential = new DeviceCodeCredential({
clientId: "<client-id>",
tenantId: "<tenant-id>",
userPromptCallback: (info) => {
console.log(info.message);
// "To sign in, use a web browser to open..."
}
});

Custom Credential Chain

typescript
import {
ChainedTokenCredential,
ManagedIdentityCredential,
AzureCliCredential
} from "@azure/identity";
// Try managed identity first, fall back to CLI
const credential = new ChainedTokenCredential(
new ManagedIdentityCredential(),
new AzureCliCredential()
);

Developer Credentials

Azure CLI
typescript
import { AzureCliCredential } from "@azure/identity";
const credential = new AzureCliCredential();
// Uses: az login
Azure Developer CLI
typescript
import { AzureDeveloperCliCredential } from "@azure/identity";
const credential = new AzureDeveloperCliCredential();
// Uses: azd auth login
Azure PowerShell
typescript
import { AzurePowerShellCredential } from "@azure/identity";
const credential = new AzurePowerShellCredential();
// Uses: Connect-AzAccount

Sovereign Clouds

typescript
import { ClientSecretCredential, AzureAuthorityHosts } from "@azure/identity";
// Azure Government
const credential = new ClientSecretCredential(
"<tenant>", "<client>", "<secret>",
{ authorityHost: AzureAuthorityHosts.AzureGovernment }
);
// Azure China
const credentialChina = new ClientSecretCredential(
"<tenant>", "<client>", "<secret>",
{ authorityHost: AzureAuthorityHosts.AzureChina }
);

Bearer Token Provider

typescript
import { DefaultAzureCredential, getBearerTokenProvider } from "@azure/identity";
const credential = new DefaultAzureCredential();
// Create a function that returns tokens
const getAccessToken = getBearerTokenProvider(
credential,
"https://cognitiveservices.azure.com/.default"
);
// Use with APIs that need bearer tokens
const token = await getAccessToken();

Key Types

typescript
import type {
TokenCredential,
AccessToken,
GetTokenOptions
} from "@azure/core-auth";
import {
DefaultAzureCredential,
DefaultAzureCredentialOptions,
ManagedIdentityCredential,
ClientSecretCredential,
ClientCertificateCredential,
InteractiveBrowserCredential,
ChainedTokenCredential,
AzureCliCredential,
AzurePowerShellCredential,
AzureDeveloperCliCredential,
DeviceCodeCredential,
AzureAuthorityHosts
} from "@azure/identity";

Custom Credential Implementation

typescript
import type { TokenCredential, AccessToken, GetTokenOptions } from "@azure/core-auth";
class CustomCredential implements TokenCredential {
async getToken(
scopes: string | string[],
options?: GetTokenOptions
): Promise<AccessToken | null> {
// Custom token acquisition logic
return {
token: "<access-token>",
expiresOnTimestamp: Date.now() + 3600000
};
}
}

Debugging

typescript
import { setLogLevel, AzureLogger } from "@azure/logger";
setLogLevel("verbose");
// Custom log handler
AzureLogger.log = (...args) => {
console.log("[Azure]", ...args);
};

Best Practices

  1. Use DefaultAzureCredential - Works in development (CLI) and production (managed identity)
  2. Never hardcode credentials - Use environment variables or managed identity
  3. Prefer managed identity - No secrets to manage in production
  4. Scope credentials appropriately - Use user-assigned identity for multi-tenant scenarios
  5. Handle token refresh - Azure SDK handles this automatically
  6. Use ChainedTokenCredential - For custom fallback scenarios

When to Use

This skill is applicable to execute the workflow or actions described in the overview.


🏰 Rei Skills — Curated by Rootcastle Engineering & Innovation | Batuhan Ayrıbaş
Engineering Beyond Boundaries | admin@rootcastle.com

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Source

Popularity

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6
Repository forks
2
7-day trend score
15

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