// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
import { createHttpHeaders, createPipelineRequest, } from "@azure/core-rest-pipeline";
import { credentialLogger } from "../../util/logging";
import { mapScopesToResource } from "./utils";
const msiName = "ManagedIdentityCredential - CloudShellMSI";
export const logger = credentialLogger(msiName);
/**
 * Generates the options used on the request for an access token.
 */
function prepareRequestOptions(scopes, clientId, resourceId) {
    const resource = mapScopesToResource(scopes);
    if (!resource) {
        throw new Error(`${msiName}: Multiple scopes are not supported.`);
    }
    const body = {
        resource,
    };
    if (clientId) {
        body.client_id = clientId;
    }
    if (resourceId) {
        body.msi_res_id = resourceId;
    }
    // This error should not bubble up, since we verify that this environment variable is defined in the isAvailable() method defined below.
    if (!process.env.MSI_ENDPOINT) {
        throw new Error(`${msiName}: Missing environment variable: MSI_ENDPOINT`);
    }
    const params = new URLSearchParams(body);
    return {
        url: process.env.MSI_ENDPOINT,
        method: "POST",
        body: params.toString(),
        headers: createHttpHeaders({
            Accept: "application/json",
            Metadata: "true",
            "Content-Type": "application/x-www-form-urlencoded",
        }),
    };
}
/**
 * Defines how to determine whether the Azure Cloud Shell MSI is available, and also how to retrieve a token from the Azure Cloud Shell MSI.
 * Since Azure Managed Identities aren't available in the Azure Cloud Shell, we log a warning for users that try to access cloud shell using user assigned identity.
 */
export const cloudShellMsi = {
    name: "cloudShellMsi",
    async isAvailable({ scopes }) {
        const resource = mapScopesToResource(scopes);
        if (!resource) {
            logger.info(`${msiName}: Unavailable. Multiple scopes are not supported.`);
            return false;
        }
        const result = Boolean(process.env.MSI_ENDPOINT);
        if (!result) {
            logger.info(`${msiName}: Unavailable. The environment variable MSI_ENDPOINT is needed.`);
        }
        return result;
    },
    async getToken(configuration, getTokenOptions = {}) {
        const { identityClient, scopes, clientId, resourceId } = configuration;
        if (clientId) {
            logger.warning(`${msiName}: user-assigned identities not supported. The argument clientId might be ignored by the service.`);
        }
        if (resourceId) {
            logger.warning(`${msiName}: user defined managed Identity by resource Id not supported. The argument resourceId might be ignored by the service.`);
        }
        logger.info(`${msiName}: Using the endpoint coming form the environment variable MSI_ENDPOINT = ${process.env.MSI_ENDPOINT}.`);
        const request = createPipelineRequest(Object.assign(Object.assign({ abortSignal: getTokenOptions.abortSignal }, prepareRequestOptions(scopes, clientId, resourceId)), { 
            // Generally, MSI endpoints use the HTTP protocol, without transport layer security (TLS).
            allowInsecureConnection: true }));
        const tokenResponse = await identityClient.sendTokenRequest(request);
        return (tokenResponse && tokenResponse.accessToken) || null;
    },
};
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