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Filename : token-generator.js
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/*! firebase-admin v13.2.0 */
"use strict";
/*!
 * @license
 * Copyright 2017 Google Inc.
 *
 * 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 });
exports.FirebaseTokenGenerator = exports.EmulatedSigner = exports.BLACKLISTED_CLAIMS = void 0;
exports.handleCryptoSignerError = handleCryptoSignerError;
const error_1 = require("../utils/error");
const crypto_signer_1 = require("../utils/crypto-signer");
const validator = require("../utils/validator");
const utils_1 = require("../utils");
const ALGORITHM_NONE = 'none';
const ONE_HOUR_IN_SECONDS = 60 * 60;
// List of blacklisted claims which cannot be provided when creating a custom token
exports.BLACKLISTED_CLAIMS = [
    'acr', 'amr', 'at_hash', 'aud', 'auth_time', 'azp', 'cnf', 'c_hash', 'exp', 'iat', 'iss', 'jti',
    'nbf', 'nonce',
];
// Audience to use for Firebase Auth Custom tokens
const FIREBASE_AUDIENCE = 'https://identitytoolkit.googleapis.com/google.identity.identitytoolkit.v1.IdentityToolkit';
/**
 * A CryptoSigner implementation that is used when communicating with the Auth emulator.
 * It produces unsigned tokens.
 */
class EmulatedSigner {
    constructor() {
        this.algorithm = ALGORITHM_NONE;
    }
    /**
     * @inheritDoc
     */
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    sign(buffer) {
        return Promise.resolve(Buffer.from(''));
    }
    /**
     * @inheritDoc
     */
    getAccountId() {
        return Promise.resolve('firebase-auth-emulator@example.com');
    }
}
exports.EmulatedSigner = EmulatedSigner;
/**
 * Class for generating different types of Firebase Auth tokens (JWTs).
 *
 * @internal
 */
class FirebaseTokenGenerator {
    /**
     * @param tenantId - The tenant ID to use for the generated Firebase Auth
     *     Custom token. If absent, then no tenant ID claim will be set in the
     *     resulting JWT.
     */
    constructor(signer, tenantId) {
        this.tenantId = tenantId;
        if (!validator.isNonNullObject(signer)) {
            throw new error_1.FirebaseAuthError(error_1.AuthClientErrorCode.INVALID_CREDENTIAL, 'INTERNAL ASSERT: Must provide a CryptoSigner to use FirebaseTokenGenerator.');
        }
        if (typeof this.tenantId !== 'undefined' && !validator.isNonEmptyString(this.tenantId)) {
            throw new error_1.FirebaseAuthError(error_1.AuthClientErrorCode.INVALID_ARGUMENT, '`tenantId` argument must be a non-empty string.');
        }
        this.signer = signer;
    }
    /**
     * Creates a new Firebase Auth Custom token.
     *
     * @param uid - The user ID to use for the generated Firebase Auth Custom token.
     * @param developerClaims - Optional developer claims to include in the generated Firebase
     *     Auth Custom token.
     * @returns A Promise fulfilled with a Firebase Auth Custom token signed with a
     *     service account key and containing the provided payload.
     */
    createCustomToken(uid, developerClaims) {
        let errorMessage;
        if (!validator.isNonEmptyString(uid)) {
            errorMessage = '`uid` argument must be a non-empty string uid.';
        }
        else if (uid.length > 128) {
            errorMessage = '`uid` argument must a uid with less than or equal to 128 characters.';
        }
        else if (!this.isDeveloperClaimsValid_(developerClaims)) {
            errorMessage = '`developerClaims` argument must be a valid, non-null object containing the developer claims.';
        }
        if (errorMessage) {
            throw new error_1.FirebaseAuthError(error_1.AuthClientErrorCode.INVALID_ARGUMENT, errorMessage);
        }
        const claims = {};
        if (typeof developerClaims !== 'undefined') {
            for (const key in developerClaims) {
                /* istanbul ignore else */
                if (Object.prototype.hasOwnProperty.call(developerClaims, key)) {
                    if (exports.BLACKLISTED_CLAIMS.indexOf(key) !== -1) {
                        throw new error_1.FirebaseAuthError(error_1.AuthClientErrorCode.INVALID_ARGUMENT, `Developer claim "${key}" is reserved and cannot be specified.`);
                    }
                    claims[key] = developerClaims[key];
                }
            }
        }
        return this.signer.getAccountId().then((account) => {
            const header = {
                alg: this.signer.algorithm,
                typ: 'JWT',
            };
            const iat = Math.floor(Date.now() / 1000);
            const body = {
                aud: FIREBASE_AUDIENCE,
                iat,
                exp: iat + ONE_HOUR_IN_SECONDS,
                iss: account,
                sub: account,
                uid,
            };
            if (this.tenantId) {
                body.tenant_id = this.tenantId;
            }
            if (Object.keys(claims).length > 0) {
                body.claims = claims;
            }
            const token = `${this.encodeSegment(header)}.${this.encodeSegment(body)}`;
            const signPromise = this.signer.sign(Buffer.from(token));
            return Promise.all([token, signPromise]);
        }).then(([token, signature]) => {
            return `${token}.${this.encodeSegment(signature)}`;
        }).catch((err) => {
            throw handleCryptoSignerError(err);
        });
    }
    encodeSegment(segment) {
        const buffer = (segment instanceof Buffer) ? segment : Buffer.from(JSON.stringify(segment));
        return (0, utils_1.toWebSafeBase64)(buffer).replace(/=+$/, '');
    }
    /**
     * Returns whether or not the provided developer claims are valid.
     *
     * @param developerClaims - Optional developer claims to validate.
     * @returns True if the provided claims are valid; otherwise, false.
     */
    // eslint-disable-next-line @typescript-eslint/naming-convention
    isDeveloperClaimsValid_(developerClaims) {
        if (typeof developerClaims === 'undefined') {
            return true;
        }
        return validator.isNonNullObject(developerClaims);
    }
}
exports.FirebaseTokenGenerator = FirebaseTokenGenerator;
/**
 * Creates a new FirebaseAuthError by extracting the error code, message and other relevant
 * details from a CryptoSignerError.
 *
 * @param err - The Error to convert into a FirebaseAuthError error
 * @returns A Firebase Auth error that can be returned to the user.
 */
function handleCryptoSignerError(err) {
    if (!(err instanceof crypto_signer_1.CryptoSignerError)) {
        return err;
    }
    if (err.code === crypto_signer_1.CryptoSignerErrorCode.SERVER_ERROR && validator.isNonNullObject(err.cause)) {
        const httpError = err.cause;
        const errorResponse = httpError.response.data;
        if (validator.isNonNullObject(errorResponse) && errorResponse.error) {
            const errorCode = errorResponse.error.status;
            const description = 'Please refer to https://firebase.google.com/docs/auth/admin/create-custom-tokens ' +
                'for more details on how to use and troubleshoot this feature.';
            const errorMsg = `${errorResponse.error.message}; ${description}`;
            return error_1.FirebaseAuthError.fromServerError(errorCode, errorMsg, errorResponse);
        }
        return new error_1.FirebaseAuthError(error_1.AuthClientErrorCode.INTERNAL_ERROR, 'Error returned from server: ' + errorResponse + '. Additionally, an ' +
            'internal error occurred while attempting to extract the ' +
            'errorcode from the error.');
    }
    return new error_1.FirebaseAuthError(mapToAuthClientErrorCode(err.code), err.message);
}
function mapToAuthClientErrorCode(code) {
    switch (code) {
        case crypto_signer_1.CryptoSignerErrorCode.INVALID_CREDENTIAL:
            return error_1.AuthClientErrorCode.INVALID_CREDENTIAL;
        case crypto_signer_1.CryptoSignerErrorCode.INVALID_ARGUMENT:
            return error_1.AuthClientErrorCode.INVALID_ARGUMENT;
        default:
            return error_1.AuthClientErrorCode.INTERNAL_ERROR;
    }
}