/*! @azure/msal-node v3.8.7 2026-02-10 */
'use strict';
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 };
//# sourceMappingURL=AppService.mjs.map
