ai-agent-deep-dive/extracted-source/node_modules/@azure/msal-node/dist/client/ManagedIdentitySources/Imds.mjs

/*! @azure/msal-node v3.8.1 2025-10-29 */
'use strict';
import { ManagedIdentityRequestParameters } from '../../config/ManagedIdentityRequestParameters.mjs';
import { BaseManagedIdentitySource } from './BaseManagedIdentitySource.mjs';
import { ManagedIdentityEnvironmentVariableNames, ManagedIdentitySourceNames, ManagedIdentityHeaders, ManagedIdentityQueryParameters, ManagedIdentityIdType, HttpMethod } from '../../utils/Constants.mjs';
import { ImdsRetryPolicy } from '../../retry/ImdsRetryPolicy.mjs';

/*
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */
// Documentation for IMDS is available at https://docs.microsoft.com/azure/active-directory/managed-identities-azure-resources/how-to-use-vm-token#get-a-token-using-http
const IMDS_TOKEN_PATH = "/metadata/identity/oauth2/token";
const DEFAULT_IMDS_ENDPOINT = `http://169.254.169.254${IMDS_TOKEN_PATH}`;
const IMDS_API_VERSION = "2018-02-01";
/**
 * Managed Identity source implementation for Azure Instance Metadata Service (IMDS).
 *
 * IMDS is available on Azure Virtual Machines and Virtual Machine Scale Sets and provides
 * a REST endpoint to obtain OAuth tokens for managed identities. This implementation
 * handles both system-assigned and user-assigned managed identities.
 *
 * Original source of code: https://github.com/Azure/azure-sdk-for-net/blob/main/sdk/identity/Azure.Identity/src/ImdsManagedIdentitySource.cs
 */
class Imds extends BaseManagedIdentitySource {
    /**
     * Constructs an Imds instance with the specified configuration.
     *
     * @param logger - Logger instance for recording debug information and errors
     * @param nodeStorage - NodeStorage instance used for token caching operations
     * @param networkClient - Network client implementation for making HTTP requests to IMDS
     * @param cryptoProvider - CryptoProvider for generating correlation IDs and other cryptographic operations
     * @param disableInternalRetries - When true, disables the built-in retry logic for IMDS requests
     * @param identityEndpoint - The complete IMDS endpoint URL including the token path
     */
    constructor(logger, nodeStorage, networkClient, cryptoProvider, disableInternalRetries, identityEndpoint) {
        super(logger, nodeStorage, networkClient, cryptoProvider, disableInternalRetries);
        this.identityEndpoint = identityEndpoint;
    }
    /**
     * Creates an Imds instance with the appropriate endpoint configuration.
     *
     * This method checks for the presence of the AZURE_POD_IDENTITY_AUTHORITY_HOST environment
     * variable, which is used in Azure Kubernetes Service (AKS) environments with Azure AD
     * Pod Identity. If found, it uses that endpoint; otherwise, it falls back to the standard
     * IMDS endpoint (169.254.169.254).
     *
     * @param logger - Logger instance for recording endpoint discovery and validation
     * @param nodeStorage - NodeStorage instance for token caching
     * @param networkClient - Network client for HTTP requests
     * @param cryptoProvider - CryptoProvider for cryptographic operations
     * @param disableInternalRetries - Whether to disable built-in retry logic
     *
     * @returns A configured Imds instance ready to make token requests
     */
    static tryCreate(logger, nodeStorage, networkClient, cryptoProvider, disableInternalRetries) {
        let validatedIdentityEndpoint;
        if (process.env[ManagedIdentityEnvironmentVariableNames
            .AZURE_POD_IDENTITY_AUTHORITY_HOST]) {
            logger.info(`[Managed Identity] Environment variable ${ManagedIdentityEnvironmentVariableNames.AZURE_POD_IDENTITY_AUTHORITY_HOST} for ${ManagedIdentitySourceNames.IMDS} returned endpoint: ${process.env[ManagedIdentityEnvironmentVariableNames
                .AZURE_POD_IDENTITY_AUTHORITY_HOST]}`);
            validatedIdentityEndpoint = Imds.getValidatedEnvVariableUrlString(ManagedIdentityEnvironmentVariableNames.AZURE_POD_IDENTITY_AUTHORITY_HOST, `${process.env[ManagedIdentityEnvironmentVariableNames
                .AZURE_POD_IDENTITY_AUTHORITY_HOST]}${IMDS_TOKEN_PATH}`, ManagedIdentitySourceNames.IMDS, logger);
        }
        else {
            logger.info(`[Managed Identity] Unable to find ${ManagedIdentityEnvironmentVariableNames.AZURE_POD_IDENTITY_AUTHORITY_HOST} environment variable for ${ManagedIdentitySourceNames.IMDS}, using the default endpoint.`);
            validatedIdentityEndpoint = DEFAULT_IMDS_ENDPOINT;
        }
        return new Imds(logger, nodeStorage, networkClient, cryptoProvider, disableInternalRetries, validatedIdentityEndpoint);
    }
    /**
     * Creates a properly configured HTTP request for acquiring an access token from IMDS.
     *
     * This method builds a complete request object with all necessary headers, query parameters,
     * and retry policies required by the Azure Instance Metadata Service.
     *
     * Key request components:
     * - HTTP GET method to the IMDS token endpoint
     * - Metadata header set to "true" (required by IMDS)
     * - API version parameter (currently "2018-02-01")
     * - Resource parameter specifying the target audience
     * - Identity-specific parameters for user-assigned managed identities
     * - IMDS-specific retry policy
     *
     * @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.METADATA_HEADER_NAME] = "true";
        request.queryParameters[ManagedIdentityQueryParameters.API_VERSION] =
            IMDS_API_VERSION;
        request.queryParameters[ManagedIdentityQueryParameters.RESOURCE] =
            resource;
        if (managedIdentityId.idType !== ManagedIdentityIdType.SYSTEM_ASSIGNED) {
            request.queryParameters[this.getManagedIdentityUserAssignedIdQueryParameterKey(managedIdentityId.idType, true // indicates source is IMDS
            )] = managedIdentityId.id;
        }
        // The bodyParameters are calculated in BaseManagedIdentity.acquireTokenWithManagedIdentity.
        request.retryPolicy = new ImdsRetryPolicy();
        return request;
    }
}

export { Imds };
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