"use strict";
// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
Object.defineProperty(exports, "__esModule", { value: true });
const child_process_1 = require("child_process");
const fs = require("fs");
const gcpMetadata = require("gcp-metadata");
const os = require("os");
const path = require("path");
const crypto_1 = require("../crypto/crypto");
const messages = require("../messages");
const transporters_1 = require("../transporters");
const computeclient_1 = require("./computeclient");
const idtokenclient_1 = require("./idtokenclient");
const envDetect_1 = require("./envDetect");
const jwtclient_1 = require("./jwtclient");
const refreshclient_1 = require("./refreshclient");
exports.CLOUD_SDK_CLIENT_ID = '764086051850-6qr4p6gpi6hn506pt8ejuq83di341hur.apps.googleusercontent.com';
class GoogleAuth {
    constructor(opts) {
        /**
         * Caches a value indicating whether the auth layer is running on Google
         * Compute Engine.
         * @private
         */
        this.checkIsGCE = undefined;
        // To save the contents of the JSON credential file
        this.jsonContent = null;
        this.cachedCredential = null;
        opts = opts || {};
        this._cachedProjectId = opts.projectId || null;
        this.keyFilename = opts.keyFilename || opts.keyFile;
        this.scopes = opts.scopes;
        this.jsonContent = opts.credentials || null;
        this.clientOptions = opts.clientOptions;
    }
    // Note:  this properly is only public to satisify unit tests.
    // https://github.com/Microsoft/TypeScript/issues/5228
    get isGCE() {
        return this.checkIsGCE;
    }
    getDefaultProjectId(callback) {
        messages.warn(messages.DEFAULT_PROJECT_ID_DEPRECATED);
        if (callback) {
            this.getProjectIdAsync().then(r => callback(null, r), callback);
        }
        else {
            return this.getProjectIdAsync();
        }
    }
    getProjectId(callback) {
        if (callback) {
            this.getProjectIdAsync().then(r => callback(null, r), callback);
        }
        else {
            return this.getProjectIdAsync();
        }
    }
    getProjectIdAsync() {
        if (this._cachedProjectId) {
            return Promise.resolve(this._cachedProjectId);
        }
        // In implicit case, supports three environments. In order of precedence,
        // the implicit environments are:
        // - GCLOUD_PROJECT or GOOGLE_CLOUD_PROJECT environment variable
        // - GOOGLE_APPLICATION_CREDENTIALS JSON file
        // - Cloud SDK: `gcloud config config-helper --format json`
        // - GCE project ID from metadata server)
        if (!this._getDefaultProjectIdPromise) {
            this._getDefaultProjectIdPromise = new Promise(async (resolve, reject) => {
                try {
                    const projectId = this.getProductionProjectId() ||
                        (await this.getFileProjectId()) ||
                        (await this.getDefaultServiceProjectId()) ||
                        (await this.getGCEProjectId());
                    this._cachedProjectId = projectId;
                    if (!projectId) {
                        throw new Error('Unable to detect a Project Id in the current environment. \n' +
                            'To learn more about authentication and Google APIs, visit: \n' +
                            'https://cloud.google.com/docs/authentication/getting-started');
                    }
                    resolve(projectId);
                }
                catch (e) {
                    reject(e);
                }
            });
        }
        return this._getDefaultProjectIdPromise;
    }
    getApplicationDefault(optionsOrCallback = {}, callback) {
        let options;
        if (typeof optionsOrCallback === 'function') {
            callback = optionsOrCallback;
        }
        else {
            options = optionsOrCallback;
        }
        if (callback) {
            this.getApplicationDefaultAsync(options).then(r => callback(null, r.credential, r.projectId), callback);
        }
        else {
            return this.getApplicationDefaultAsync(options);
        }
    }
    async getApplicationDefaultAsync(options = {}) {
        // If we've already got a cached credential, just return it.
        if (this.cachedCredential) {
            return {
                credential: this.cachedCredential,
                projectId: await this.getProjectIdAsync(),
            };
        }
        let credential;
        let projectId;
        // Check for the existence of a local environment variable pointing to the
        // location of the credential file. This is typically used in local
        // developer scenarios.
        credential = await this._tryGetApplicationCredentialsFromEnvironmentVariable(options);
        if (credential) {
            if (credential instanceof jwtclient_1.JWT) {
                credential.scopes = this.scopes;
            }
            this.cachedCredential = credential;
            projectId = await this.getProjectId();
            return { credential, projectId };
        }
        // Look in the well-known credential file location.
        credential = await this._tryGetApplicationCredentialsFromWellKnownFile(options);
        if (credential) {
            if (credential instanceof jwtclient_1.JWT) {
                credential.scopes = this.scopes;
            }
            this.cachedCredential = credential;
            projectId = await this.getProjectId();
            return { credential, projectId };
        }
        // Determine if we're running on GCE.
        let isGCE;
        try {
            isGCE = await this._checkIsGCE();
        }
        catch (e) {
            e.message = `Unexpected error determining execution environment: ${e.message}`;
            throw e;
        }
        if (!isGCE) {
            // We failed to find the default credentials. Bail out with an error.
            throw new Error('Could not load the default credentials. Browse to https://cloud.google.com/docs/authentication/getting-started for more information.');
        }
        // For GCE, just return a default ComputeClient. It will take care of
        // the rest.
        options.scopes = this.scopes;
        this.cachedCredential = new computeclient_1.Compute(options);
        projectId = await this.getProjectId();
        return { projectId, credential: this.cachedCredential };
    }
    /**
     * Determines whether the auth layer is running on Google Compute Engine.
     * @returns A promise that resolves with the boolean.
     * @api private
     */
    async _checkIsGCE() {
        if (this.checkIsGCE === undefined) {
            this.checkIsGCE = await gcpMetadata.isAvailable();
        }
        return this.checkIsGCE;
    }
    /**
     * Attempts to load default credentials from the environment variable path..
     * @returns Promise that resolves with the OAuth2Client or null.
     * @api private
     */
    async _tryGetApplicationCredentialsFromEnvironmentVariable(options) {
        const credentialsPath = process.env['GOOGLE_APPLICATION_CREDENTIALS'] ||
            process.env['google_application_credentials'];
        if (!credentialsPath || credentialsPath.length === 0) {
            return null;
        }
        try {
            return this._getApplicationCredentialsFromFilePath(credentialsPath, options);
        }
        catch (e) {
            e.message = `Unable to read the credential file specified by the GOOGLE_APPLICATION_CREDENTIALS environment variable: ${e.message}`;
            throw e;
        }
    }
    /**
     * Attempts to load default credentials from a well-known file location
     * @return Promise that resolves with the OAuth2Client or null.
     * @api private
     */
    async _tryGetApplicationCredentialsFromWellKnownFile(options) {
        // First, figure out the location of the file, depending upon the OS type.
        let location = null;
        if (this._isWindows()) {
            // Windows
            location = process.env['APPDATA'];
        }
        else {
            // Linux or Mac
            const home = process.env['HOME'];
            if (home) {
                location = path.join(home, '.config');
            }
        }
        // If we found the root path, expand it.
        if (location) {
            location = path.join(location, 'gcloud', 'application_default_credentials.json');
            if (!fs.existsSync(location)) {
                location = null;
            }
        }
        // The file does not exist.
        if (!location) {
            return null;
        }
        // The file seems to exist. Try to use it.
        const client = await this._getApplicationCredentialsFromFilePath(location, options);
        this.warnOnProblematicCredentials(client);
        return client;
    }
    /**
     * Attempts to load default credentials from a file at the given path..
     * @param filePath The path to the file to read.
     * @returns Promise that resolves with the OAuth2Client
     * @api private
     */
    async _getApplicationCredentialsFromFilePath(filePath, options = {}) {
        // Make sure the path looks like a string.
        if (!filePath || filePath.length === 0) {
            throw new Error('The file path is invalid.');
        }
        // Make sure there is a file at the path. lstatSync will throw if there is
        // nothing there.
        try {
            // Resolve path to actual file in case of symlink. Expect a thrown error
            // if not resolvable.
            filePath = fs.realpathSync(filePath);
            if (!fs.lstatSync(filePath).isFile()) {
                throw new Error();
            }
        }
        catch (err) {
            err.message = `The file at ${filePath} does not exist, or it is not a file. ${err.message}`;
            throw err;
        }
        // Now open a read stream on the file, and parse it.
        const readStream = fs.createReadStream(filePath);
        return this.fromStream(readStream, options);
    }
    /**
     * Credentials from the Cloud SDK that are associated with Cloud SDK's project
     * are problematic because they may not have APIs enabled and have limited
     * quota. If this is the case, warn about it.
     */
    warnOnProblematicCredentials(client) {
        if (client.email === exports.CLOUD_SDK_CLIENT_ID) {
            messages.warn(messages.PROBLEMATIC_CREDENTIALS_WARNING);
        }
    }
    /**
     * Create a credentials instance using the given input options.
     * @param json The input object.
     * @param options The JWT or UserRefresh options for the client
     * @returns JWT or UserRefresh Client with data
     */
    fromJSON(json, options) {
        let client;
        if (!json) {
            throw new Error('Must pass in a JSON object containing the Google auth settings.');
        }
        options = options || {};
        if (json.type === 'authorized_user') {
            client = new refreshclient_1.UserRefreshClient(options);
        }
        else {
            options.scopes = this.scopes;
            client = new jwtclient_1.JWT(options);
        }
        client.fromJSON(json);
        return client;
    }
    /**
     * Return a JWT or UserRefreshClient from JavaScript object, caching both the
     * object used to instantiate and the client.
     * @param json The input object.
     * @param options The JWT or UserRefresh options for the client
     * @returns JWT or UserRefresh Client with data
     */
    _cacheClientFromJSON(json, options) {
        let client;
        // create either a UserRefreshClient or JWT client.
        options = options || {};
        if (json.type === 'authorized_user') {
            client = new refreshclient_1.UserRefreshClient(options);
        }
        else {
            options.scopes = this.scopes;
            client = new jwtclient_1.JWT(options);
        }
        client.fromJSON(json);
        // cache both raw data used to instantiate client and client itself.
        this.jsonContent = json;
        this.cachedCredential = client;
        return this.cachedCredential;
    }
    fromStream(inputStream, optionsOrCallback = {}, callback) {
        let options = {};
        if (typeof optionsOrCallback === 'function') {
            callback = optionsOrCallback;
        }
        else {
            options = optionsOrCallback;
        }
        if (callback) {
            this.fromStreamAsync(inputStream, options).then(r => callback(null, r), callback);
        }
        else {
            return this.fromStreamAsync(inputStream, options);
        }
    }
    fromStreamAsync(inputStream, options) {
        return new Promise((resolve, reject) => {
            if (!inputStream) {
                throw new Error('Must pass in a stream containing the Google auth settings.');
            }
            let s = '';
            inputStream
                .setEncoding('utf8')
                .on('error', reject)
                .on('data', chunk => (s += chunk))
                .on('end', () => {
                try {
                    const data = JSON.parse(s);
                    const r = this._cacheClientFromJSON(data, options);
                    return resolve(r);
                }
                catch (err) {
                    return reject(err);
                }
            });
        });
    }
    /**
     * Create a credentials instance using the given API key string.
     * @param apiKey The API key string
     * @param options An optional options object.
     * @returns A JWT loaded from the key
     */
    fromAPIKey(apiKey, options) {
        options = options || {};
        const client = new jwtclient_1.JWT(options);
        client.fromAPIKey(apiKey);
        return client;
    }
    /**
     * Determines whether the current operating system is Windows.
     * @api private
     */
    _isWindows() {
        const sys = os.platform();
        if (sys && sys.length >= 3) {
            if (sys.substring(0, 3).toLowerCase() === 'win') {
                return true;
            }
        }
        return false;
    }
    /**
     * Run the Google Cloud SDK command that prints the default project ID
     */
    async getDefaultServiceProjectId() {
        return new Promise(resolve => {
            child_process_1.exec('gcloud config config-helper --format json', (err, stdout, stderr) => {
                if (!err && stdout) {
                    try {
                        const projectId = JSON.parse(stdout).configuration.properties.core
                            .project;
                        resolve(projectId);
                        return;
                    }
                    catch (e) {
                        // ignore errors
                    }
                }
                resolve(null);
            });
        });
    }
    /**
     * Loads the project id from environment variables.
     * @api private
     */
    getProductionProjectId() {
        return (process.env['GCLOUD_PROJECT'] ||
            process.env['GOOGLE_CLOUD_PROJECT'] ||
            process.env['gcloud_project'] ||
            process.env['google_cloud_project']);
    }
    /**
     * Loads the project id from the GOOGLE_APPLICATION_CREDENTIALS json file.
     * @api private
     */
    async getFileProjectId() {
        if (this.cachedCredential) {
            // Try to read the project ID from the cached credentials file
            return this.cachedCredential.projectId;
        }
        // Ensure the projectId is loaded from the keyFile if available.
        if (this.keyFilename) {
            const creds = await this.getClient();
            if (creds && creds.projectId) {
                return creds.projectId;
            }
        }
        // Try to load a credentials file and read its project ID
        const r = await this._tryGetApplicationCredentialsFromEnvironmentVariable();
        if (r) {
            return r.projectId;
        }
        else {
            return null;
        }
    }
    /**
     * Gets the Compute Engine project ID if it can be inferred.
     */
    async getGCEProjectId() {
        try {
            const r = await gcpMetadata.project('project-id');
            return r;
        }
        catch (e) {
            // Ignore any errors
            return null;
        }
    }
    getCredentials(callback) {
        if (callback) {
            this.getCredentialsAsync().then(r => callback(null, r), callback);
        }
        else {
            return this.getCredentialsAsync();
        }
    }
    async getCredentialsAsync() {
        await this.getClient();
        if (this.jsonContent) {
            const credential = {
                client_email: this.jsonContent.client_email,
                private_key: this.jsonContent.private_key,
            };
            return credential;
        }
        const isGCE = await this._checkIsGCE();
        if (!isGCE) {
            throw new Error('Unknown error.');
        }
        // For GCE, return the service account details from the metadata server
        // NOTE: The trailing '/' at the end of service-accounts/ is very important!
        // The GCF metadata server doesn't respect querystring params if this / is
        // not included.
        const data = await gcpMetadata.instance({
            property: 'service-accounts/',
            params: { recursive: 'true' },
        });
        if (!data || !data.default || !data.default.email) {
            throw new Error('Failure from metadata server.');
        }
        return { client_email: data.default.email };
    }
    /**
     * Automatically obtain a client based on the provided configuration.  If no
     * options were passed, use Application Default Credentials.
     */
    async getClient(options) {
        if (options) {
            throw new Error('Passing options to getClient is forbidden in v5.0.0. Use new GoogleAuth(opts) instead.');
        }
        if (!this.cachedCredential) {
            if (this.jsonContent) {
                this._cacheClientFromJSON(this.jsonContent, this.clientOptions);
            }
            else if (this.keyFilename) {
                const filePath = path.resolve(this.keyFilename);
                const stream = fs.createReadStream(filePath);
                await this.fromStreamAsync(stream, this.clientOptions);
            }
            else {
                await this.getApplicationDefaultAsync(this.clientOptions);
            }
        }
        return this.cachedCredential;
    }
    /**
     * Creates a client which will fetch an ID token for authorization.
     * @param targetAudience the audience for the fetched ID token.
     * @returns IdTokenClient for making HTTP calls authenticated with ID tokens.
     */
    async getIdTokenClient(targetAudience) {
        const client = await this.getClient();
        if (!('fetchIdToken' in client)) {
            throw new Error('Cannot fetch ID token in this environment, use GCE or set the GOOGLE_APPLICATION_CREDENTIALS environment variable to a service account credentials JSON file.');
        }
        return new idtokenclient_1.IdTokenClient({ targetAudience, idTokenProvider: client });
    }
    /**
     * Automatically obtain application default credentials, and return
     * an access token for making requests.
     */
    async getAccessToken() {
        const client = await this.getClient();
        return (await client.getAccessToken()).token;
    }
    /**
     * Obtain the HTTP headers that will provide authorization for a given
     * request.
     */
    async getRequestHeaders(url) {
        const client = await this.getClient();
        return client.getRequestHeaders(url);
    }
    /**
     * Obtain credentials for a request, then attach the appropriate headers to
     * the request options.
     * @param opts Axios or Request options on which to attach the headers
     */
    async authorizeRequest(opts) {
        opts = opts || {};
        const url = opts.url || opts.uri;
        const client = await this.getClient();
        const headers = await client.getRequestHeaders(url);
        opts.headers = Object.assign(opts.headers || {}, headers);
        return opts;
    }
    /**
     * Automatically obtain application default credentials, and make an
     * HTTP request using the given options.
     * @param opts Axios request options for the HTTP request.
     */
    // tslint:disable-next-line no-any
    async request(opts) {
        const client = await this.getClient();
        return client.request(opts);
    }
    /**
     * Determine the compute environment in which the code is running.
     */
    getEnv() {
        return envDetect_1.getEnv();
    }
    /**
     * Sign the given data with the current private key, or go out
     * to the IAM API to sign it.
     * @param data The data to be signed.
     */
    async sign(data) {
        const client = await this.getClient();
        const crypto = crypto_1.createCrypto();
        if (client instanceof jwtclient_1.JWT && client.key) {
            const sign = await crypto.sign(client.key, data);
            return sign;
        }
        const projectId = await this.getProjectId();
        if (!projectId) {
            throw new Error('Cannot sign data without a project ID.');
        }
        const creds = await this.getCredentials();
        if (!creds.client_email) {
            throw new Error('Cannot sign data without `client_email`.');
        }
        const id = `projects/${projectId}/serviceAccounts/${creds.client_email}`;
        const res = await this.request({
            method: 'POST',
            url: `https://iam.googleapis.com/v1/${id}:signBlob`,
            data: { bytesToSign: crypto.encodeBase64StringUtf8(data) },
        });
        return res.data.signature;
    }
}
exports.GoogleAuth = GoogleAuth;
/**
 * Export DefaultTransporter as a static property of the class.
 */
GoogleAuth.DefaultTransporter = transporters_1.DefaultTransporter;
//# sourceMappingURL=googleauth.js.map