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Viewing file:     callback_workflow.js (5.93 KB)      -rw-r--r--

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.CallbackWorkflow = exports.AUTOMATED_TIMEOUT_MS = exports.HUMAN_TIMEOUT_MS = void 0;
const promises_1 = require("timers/promises");
const error_1 = require("../../../error");
const utils_1 = require("../../../utils");
const command_builders_1 = require("./command_builders");
/** 5 minutes in milliseconds */
exports.HUMAN_TIMEOUT_MS = 300000;
/** 1 minute in milliseconds */
exports.AUTOMATED_TIMEOUT_MS = 60000;
/** Properties allowed on results of callbacks. */
const RESULT_PROPERTIES = ['accessToken', 'expiresInSeconds', 'refreshToken'];
/** Error message when the callback result is invalid. */
const CALLBACK_RESULT_ERROR = 'User provided OIDC callbacks must return a valid object with an accessToken.';
/** The time to throttle callback calls. */
const THROTTLE_MS = 100;
/**
 * OIDC implementation of a callback based workflow.
 * @internal
 */
class CallbackWorkflow {
    /**
     * Instantiate the callback workflow.
     */
    constructor(cache, callback) {
        this.cache = cache;
        this.callback = this.withLock(callback);
        this.lastExecutionTime = Date.now() - THROTTLE_MS;
    }
    /**
     * Get the document to add for speculative authentication. This also needs
     * to add a db field from the credentials source.
     */
    async speculativeAuth(connection, credentials) {
        // Check if the Client Cache has an access token.
        // If it does, cache the access token in the Connection Cache and send a JwtStepRequest
        // with the cached access token in the speculative authentication SASL payload.
        if (this.cache.hasAccessToken) {
            const accessToken = this.cache.getAccessToken();
            connection.accessToken = accessToken;
            const document = (0, command_builders_1.finishCommandDocument)(accessToken);
            document.db = credentials.source;
            return { speculativeAuthenticate: document };
        }
        return {};
    }
    /**
     * Reauthenticate the callback workflow. For this we invalidated the access token
     * in the cache and run the authentication steps again. No initial handshake needs
     * to be sent.
     */
    async reauthenticate(connection, credentials) {
        if (this.cache.hasAccessToken) {
            // Reauthentication implies the token has expired.
            if (connection.accessToken === this.cache.getAccessToken()) {
                // If connection's access token is the same as the cache's, remove
                // the token from the cache and connection.
                this.cache.removeAccessToken();
                delete connection.accessToken;
            }
            else {
                // If the connection's access token is different from the cache's, set
                // the cache's token on the connection and do not remove from the
                // cache.
                connection.accessToken = this.cache.getAccessToken();
            }
        }
        await this.execute(connection, credentials);
    }
    /**
     * Starts the callback authentication process. If there is a speculative
     * authentication document from the initial handshake, then we will use that
     * value to get the issuer, otherwise we will send the saslStart command.
     */
    async startAuthentication(connection, credentials, response) {
        let result;
        if (response?.speculativeAuthenticate) {
            result = response.speculativeAuthenticate;
        }
        else {
            result = await connection.command((0, utils_1.ns)(credentials.source), (0, command_builders_1.startCommandDocument)(credentials), undefined);
        }
        return result;
    }
    /**
     * Finishes the callback authentication process.
     */
    async finishAuthentication(connection, credentials, token, conversationId) {
        await connection.command((0, utils_1.ns)(credentials.source), (0, command_builders_1.finishCommandDocument)(token, conversationId), undefined);
    }
    /**
     * Executes the callback and validates the output.
     */
    async executeAndValidateCallback(params) {
        const result = await this.callback(params);
        // Validate that the result returned by the callback is acceptable. If it is not
        // we must clear the token result from the cache.
        if (isCallbackResultInvalid(result)) {
            throw new error_1.MongoMissingCredentialsError(CALLBACK_RESULT_ERROR);
        }
        return result;
    }
    /**
     * Ensure the callback is only executed one at a time and throttles the calls
     * to every 100ms.
     */
    withLock(callback) {
        let lock = Promise.resolve();
        return async (params) => {
            // We do this to ensure that we would never return the result of the
            // previous lock, only the current callback's value would get returned.
            await lock;
            lock = lock
                .catch(() => null)
                .then(async () => {
                const difference = Date.now() - this.lastExecutionTime;
                if (difference <= THROTTLE_MS) {
                    await (0, promises_1.setTimeout)(THROTTLE_MS - difference, { signal: params.timeoutContext });
                }
                this.lastExecutionTime = Date.now();
                return await callback(params);
            });
            return await lock;
        };
    }
}
exports.CallbackWorkflow = CallbackWorkflow;
/**
 * Determines if a result returned from a request or refresh callback
 * function is invalid. This means the result is nullish, doesn't contain
 * the accessToken required field, and does not contain extra fields.
 */
function isCallbackResultInvalid(tokenResult) {
    if (tokenResult == null || typeof tokenResult !== 'object')
        return true;
    if (!('accessToken' in tokenResult))
        return true;
    return !Object.getOwnPropertyNames(tokenResult).every(prop => RESULT_PROPERTIES.includes(prop));
}
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