// Copyright (c) Microsoft Corporation.
// Licensed under the MIT license.
import { CredentialUnavailableError } from "../errors";
import { credentialLogger, formatSuccess, formatError } from "../util/logging";
import { trace } from "../util/tracing";
import { ensureValidScope, getScopeResource } from "../util/scopeUtils";
import { processUtils } from "../util/processUtils";
import { processMultiTenantRequest } from "../util/validateMultiTenant";
import { checkTenantId } from "../util/checkTenantId";
const logger = credentialLogger("AzurePowerShellCredential");
const isWindows = process.platform === "win32";
/**
 * Returns a platform-appropriate command name by appending ".exe" on Windows.
 *
 * @internal
 */
export function formatCommand(commandName) {
    if (isWindows) {
        return `${commandName}.exe`;
    }
    else {
        return commandName;
    }
}
/**
 * Receives a list of commands to run, executes them, then returns the outputs.
 * If anything fails, an error is thrown.
 * @internal
 */
async function runCommands(commands) {
    const results = [];
    for (const command of commands) {
        const [file, ...parameters] = command;
        const result = (await processUtils.execFile(file, parameters, { encoding: "utf8" }));
        results.push(result);
    }
    return results;
}
/**
 * Known PowerShell errors
 * @internal
 */
export const powerShellErrors = {
    login: "Run Connect-AzAccount to login",
    installed: "The specified module 'Az.Accounts' with version '2.2.0' was not loaded because no valid module file was found in any module directory",
};
/**
 * Messages to use when throwing in this credential.
 * @internal
 */
export const powerShellPublicErrorMessages = {
    login: "Please run 'Connect-AzAccount' from PowerShell to authenticate before using this credential.",
    installed: `The 'Az.Account' module >= 2.2.0 is not installed. Install the Azure Az PowerShell module with: "Install-Module -Name Az -Scope CurrentUser -Repository PSGallery -Force".`,
    troubleshoot: `To troubleshoot, visit https://aka.ms/azsdk/js/identity/powershellcredential/troubleshoot.`,
};
// PowerShell Azure User not logged in error check.
const isLoginError = (err) => err.message.match(`(.*)${powerShellErrors.login}(.*)`);
// Az Module not Installed in Azure PowerShell check.
const isNotInstalledError = (err) => err.message.match(powerShellErrors.installed);
/**
 * The PowerShell commands to be tried, in order.
 *
 * @internal
 */
export const commandStack = [formatCommand("pwsh")];
if (isWindows) {
    commandStack.push(formatCommand("powershell"));
}
/**
 * This credential will use the currently logged-in user information from the
 * Azure PowerShell module. To do so, it will read the user access token and
 * expire time with Azure PowerShell command `Get-AzAccessToken -ResourceUrl {ResourceScope}`
 */
export class AzurePowerShellCredential {
    /**
     * Creates an instance of the {@link AzurePowerShellCredential}.
     *
     * To use this credential:
     * - Install the Azure Az PowerShell module with:
     *   `Install-Module -Name Az -Scope CurrentUser -Repository PSGallery -Force`.
     * - You have already logged in to Azure PowerShell using the command
     * `Connect-AzAccount` from the command line.
     *
     * @param options - Options, to optionally allow multi-tenant requests.
     */
    constructor(options) {
        this.tenantId = options === null || options === void 0 ? void 0 : options.tenantId;
    }
    /**
     * Gets the access token from Azure PowerShell
     * @param resource - The resource to use when getting the token
     */
    async getAzurePowerShellAccessToken(resource, tenantId) {
        // Clone the stack to avoid mutating it while iterating
        for (const powerShellCommand of [...commandStack]) {
            try {
                await runCommands([[powerShellCommand, "/?"]]);
            }
            catch (e) {
                // Remove this credential from the original stack so that we don't try it again.
                commandStack.shift();
                continue;
            }
            let tenantSection = "";
            if (tenantId) {
                tenantSection = `-TenantId "${tenantId}"`;
            }
            const results = await runCommands([
                [
                    powerShellCommand,
                    "-Command",
                    "Import-Module Az.Accounts -MinimumVersion 2.2.0 -PassThru",
                ],
                [
                    powerShellCommand,
                    "-Command",
                    `Get-AzAccessToken ${tenantSection} -ResourceUrl "${resource}" | ConvertTo-Json`,
                ],
            ]);
            const result = results[1];
            try {
                return JSON.parse(result);
            }
            catch (e) {
                throw new Error(`Unable to parse the output of PowerShell. Received output: ${result}`);
            }
        }
        throw new Error(`Unable to execute PowerShell. Ensure that it is installed in your system`);
    }
    /**
     * Authenticates with Azure Active Directory and returns an access token if successful.
     * If the authentication cannot be performed through PowerShell, a {@link CredentialUnavailableError} will be thrown.
     *
     * @param scopes - The list of scopes for which the token will have access.
     * @param options - The options used to configure any requests this TokenCredential implementation might make.
     */
    async getToken(scopes, options = {}) {
        return trace(`${this.constructor.name}.getToken`, options, async () => {
            const tenantId = processMultiTenantRequest(this.tenantId, options);
            if (tenantId) {
                checkTenantId(logger, tenantId);
            }
            const scope = typeof scopes === "string" ? scopes : scopes[0];
            ensureValidScope(scope, logger);
            logger.getToken.info(`Using the scope ${scope}`);
            const resource = getScopeResource(scope);
            try {
                const response = await this.getAzurePowerShellAccessToken(resource, tenantId);
                logger.getToken.info(formatSuccess(scopes));
                return {
                    token: response.Token,
                    expiresOnTimestamp: new Date(response.ExpiresOn).getTime(),
                };
            }
            catch (err) {
                if (isNotInstalledError(err)) {
                    const error = new CredentialUnavailableError(powerShellPublicErrorMessages.installed);
                    logger.getToken.info(formatError(scope, error));
                    throw error;
                }
                else if (isLoginError(err)) {
                    const error = new CredentialUnavailableError(powerShellPublicErrorMessages.login);
                    logger.getToken.info(formatError(scope, error));
                    throw error;
                }
                const error = new CredentialUnavailableError(`${err}. ${powerShellPublicErrorMessages.troubleshoot}`);
                logger.getToken.info(formatError(scope, error));
                throw error;
            }
        });
    }
}
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