/*! @azure/msal-common v15.13.1 2025-10-29 */
'use strict';
import { Constants, HttpStatus, RegionDiscoverySources } from '../utils/Constants.mjs';
import { PerformanceEvents } from '../telemetry/performance/PerformanceEvent.mjs';
import { invokeAsync } from '../utils/FunctionWrappers.mjs';

/*
 * Copyright (c) Microsoft Corporation. All rights reserved.
 * Licensed under the MIT License.
 */
class RegionDiscovery {
    constructor(networkInterface, logger, performanceClient, correlationId) {
        this.networkInterface = networkInterface;
        this.logger = logger;
        this.performanceClient = performanceClient;
        this.correlationId = correlationId;
    }
    /**
     * Detect the region from the application's environment.
     *
     * @returns Promise<string | null>
     */
    async detectRegion(environmentRegion, regionDiscoveryMetadata) {
        this.performanceClient?.addQueueMeasurement(PerformanceEvents.RegionDiscoveryDetectRegion, this.correlationId);
        // Initialize auto detected region with the region from the envrionment
        let autodetectedRegionName = environmentRegion;
        // Check if a region was detected from the environment, if not, attempt to get the region from IMDS
        if (!autodetectedRegionName) {
            const options = RegionDiscovery.IMDS_OPTIONS;
            try {
                const localIMDSVersionResponse = await invokeAsync(this.getRegionFromIMDS.bind(this), PerformanceEvents.RegionDiscoveryGetRegionFromIMDS, this.logger, this.performanceClient, this.correlationId)(Constants.IMDS_VERSION, options);
                if (localIMDSVersionResponse.status === HttpStatus.SUCCESS) {
                    autodetectedRegionName = localIMDSVersionResponse.body;
                    regionDiscoveryMetadata.region_source =
                        RegionDiscoverySources.IMDS;
                }
                // If the response using the local IMDS version failed, try to fetch the current version of IMDS and retry.
                if (localIMDSVersionResponse.status === HttpStatus.BAD_REQUEST) {
                    const currentIMDSVersion = await invokeAsync(this.getCurrentVersion.bind(this), PerformanceEvents.RegionDiscoveryGetCurrentVersion, this.logger, this.performanceClient, this.correlationId)(options);
                    if (!currentIMDSVersion) {
                        regionDiscoveryMetadata.region_source =
                            RegionDiscoverySources.FAILED_AUTO_DETECTION;
                        return null;
                    }
                    const currentIMDSVersionResponse = await invokeAsync(this.getRegionFromIMDS.bind(this), PerformanceEvents.RegionDiscoveryGetRegionFromIMDS, this.logger, this.performanceClient, this.correlationId)(currentIMDSVersion, options);
                    if (currentIMDSVersionResponse.status === HttpStatus.SUCCESS) {
                        autodetectedRegionName =
                            currentIMDSVersionResponse.body;
                        regionDiscoveryMetadata.region_source =
                            RegionDiscoverySources.IMDS;
                    }
                }
            }
            catch (e) {
                regionDiscoveryMetadata.region_source =
                    RegionDiscoverySources.FAILED_AUTO_DETECTION;
                return null;
            }
        }
        else {
            regionDiscoveryMetadata.region_source =
                RegionDiscoverySources.ENVIRONMENT_VARIABLE;
        }
        // If no region was auto detected from the environment or from the IMDS endpoint, mark the attempt as a FAILED_AUTO_DETECTION
        if (!autodetectedRegionName) {
            regionDiscoveryMetadata.region_source =
                RegionDiscoverySources.FAILED_AUTO_DETECTION;
        }
        return autodetectedRegionName || null;
    }
    /**
     * Make the call to the IMDS endpoint
     *
     * @param imdsEndpointUrl
     * @returns Promise<NetworkResponse<string>>
     */
    async getRegionFromIMDS(version, options) {
        this.performanceClient?.addQueueMeasurement(PerformanceEvents.RegionDiscoveryGetRegionFromIMDS, this.correlationId);
        return this.networkInterface.sendGetRequestAsync(`${Constants.IMDS_ENDPOINT}?api-version=${version}&format=text`, options, Constants.IMDS_TIMEOUT);
    }
    /**
     * Get the most recent version of the IMDS endpoint available
     *
     * @returns Promise<string | null>
     */
    async getCurrentVersion(options) {
        this.performanceClient?.addQueueMeasurement(PerformanceEvents.RegionDiscoveryGetCurrentVersion, this.correlationId);
        try {
            const response = await this.networkInterface.sendGetRequestAsync(`${Constants.IMDS_ENDPOINT}?format=json`, options);
            // When IMDS endpoint is called without the api version query param, bad request response comes back with latest version.
            if (response.status === HttpStatus.BAD_REQUEST &&
                response.body &&
                response.body["newest-versions"] &&
                response.body["newest-versions"].length > 0) {
                return response.body["newest-versions"][0];
            }
            return null;
        }
        catch (e) {
            return null;
        }
    }
}
// Options for the IMDS endpoint request
RegionDiscovery.IMDS_OPTIONS = {
    headers: {
        Metadata: "true",
    },
};

export { RegionDiscovery };
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