@azure/msal-node
Version:
Microsoft Authentication Library for Node
110 lines (107 loc) • 6.92 kB
JavaScript
/*! @azure/msal-node v5.0.3 2026-01-28 */
;
import { BaseManagedIdentitySource } from './BaseManagedIdentitySource.mjs';
import { ManagedIdentityEnvironmentVariableNames, ManagedIdentitySourceNames, ManagedIdentityHeaders, ManagedIdentityQueryParameters, ManagedIdentityIdType, HttpMethod } from '../../utils/Constants.mjs';
import { ManagedIdentityRequestParameters } from '../../config/ManagedIdentityRequestParameters.mjs';
/*
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License.
*/
// MSI Constants. Docs for MSI are available here https://docs.microsoft.com/azure/app-service/overview-managed-identity
const APP_SERVICE_MSI_API_VERSION = "2019-08-01";
/**
* Azure App Service Managed Identity Source implementation.
*
* This class provides managed identity authentication for applications running in Azure App Service.
* It uses the local metadata service endpoint available within App Service environments to obtain
* access tokens without requiring explicit credentials.
*
* Original source of code: https://github.com/Azure/azure-sdk-for-net/blob/main/sdk/identity/Azure.Identity/src/AppServiceManagedIdentitySource.cs
*/
class AppService extends BaseManagedIdentitySource {
/**
* Creates a new instance of the AppService managed identity source.
*
* @param logger - Logger instance for diagnostic output
* @param nodeStorage - Node.js storage implementation for caching
* @param networkClient - Network client for making HTTP requests
* @param cryptoProvider - Cryptographic operations provider
* @param disableInternalRetries - Whether to disable internal retry logic
* @param identityEndpoint - The App Service identity endpoint URL
* @param identityHeader - The secret header value required for authentication
*/
constructor(logger, nodeStorage, networkClient, cryptoProvider, disableInternalRetries, identityEndpoint, identityHeader) {
super(logger, nodeStorage, networkClient, cryptoProvider, disableInternalRetries);
this.identityEndpoint = identityEndpoint;
this.identityHeader = identityHeader;
}
/**
* Retrieves the required environment variables for App Service managed identity.
*
* App Service managed identity requires two environment variables:
* - IDENTITY_ENDPOINT: The URL of the local metadata service
* - IDENTITY_HEADER: A secret header value for authentication
*
* @returns An array containing [identityEndpoint, identityHeader] values from environment variables.
* Either value may be undefined if the environment variable is not set.
*/
static getEnvironmentVariables() {
const identityEndpoint = process.env[ManagedIdentityEnvironmentVariableNames.IDENTITY_ENDPOINT];
const identityHeader = process.env[ManagedIdentityEnvironmentVariableNames.IDENTITY_HEADER];
return [identityEndpoint, identityHeader];
}
/**
* Attempts to create an AppService managed identity source if the environment supports it.
*
* This method checks for the presence of required environment variables and validates
* the identity endpoint URL. If the environment is not suitable for App Service managed
* identity (missing environment variables or invalid endpoint), it returns null.
*
* @param logger - Logger instance for diagnostic output
* @param nodeStorage - Node.js storage implementation for caching
* @param networkClient - Network client for making HTTP requests
* @param cryptoProvider - Cryptographic operations provider
* @param disableInternalRetries - Whether to disable internal retry logic
*
* @returns A new AppService instance if the environment is suitable, null otherwise
*/
static tryCreate(logger, nodeStorage, networkClient, cryptoProvider, disableInternalRetries) {
const [identityEndpoint, identityHeader] = AppService.getEnvironmentVariables();
// if either of the identity endpoint or identity header variables are undefined, this MSI provider is unavailable.
if (!identityEndpoint || !identityHeader) {
logger.info(`[Managed Identity] ${ManagedIdentitySourceNames.APP_SERVICE} managed identity is unavailable because one or both of the '${ManagedIdentityEnvironmentVariableNames.IDENTITY_HEADER}' and '${ManagedIdentityEnvironmentVariableNames.IDENTITY_ENDPOINT}' environment variables are not defined.`, "");
return null;
}
const validatedIdentityEndpoint = AppService.getValidatedEnvVariableUrlString(ManagedIdentityEnvironmentVariableNames.IDENTITY_ENDPOINT, identityEndpoint, ManagedIdentitySourceNames.APP_SERVICE, logger);
logger.info(`[Managed Identity] Environment variables validation passed for ${ManagedIdentitySourceNames.APP_SERVICE} managed identity. Endpoint URI: ${validatedIdentityEndpoint}. Creating ${ManagedIdentitySourceNames.APP_SERVICE} managed identity.`, "");
return new AppService(logger, nodeStorage, networkClient, cryptoProvider, disableInternalRetries, identityEndpoint, identityHeader);
}
/**
* Creates a managed identity token request for the App Service environment.
*
* This method constructs an HTTP GET request to the App Service identity endpoint
* with the required headers, query parameters, and managed identity configuration.
* The request includes the secret header for authentication and appropriate API version.
*
* @param resource - The target resource/scope for which to request an access token (e.g., "https://graph.microsoft.com/.default")
* @param managedIdentityId - The managed identity configuration specifying whether to use system-assigned or user-assigned identity
*
* @returns A configured ManagedIdentityRequestParameters object ready for network execution
*/
createRequest(resource, managedIdentityId) {
const request = new ManagedIdentityRequestParameters(HttpMethod.GET, this.identityEndpoint);
request.headers[ManagedIdentityHeaders.APP_SERVICE_SECRET_HEADER_NAME] =
this.identityHeader;
request.queryParameters[ManagedIdentityQueryParameters.API_VERSION] =
APP_SERVICE_MSI_API_VERSION;
request.queryParameters[ManagedIdentityQueryParameters.RESOURCE] =
resource;
if (managedIdentityId.idType !== ManagedIdentityIdType.SYSTEM_ASSIGNED) {
request.queryParameters[this.getManagedIdentityUserAssignedIdQueryParameterKey(managedIdentityId.idType)] = managedIdentityId.id;
}
// bodyParameters calculated in BaseManagedIdentity.acquireTokenWithManagedIdentity
return request;
}
}
export { AppService };
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