@slack/oauth/dist/state-stores/file-state-store.js

Official library for interacting with Slack's Oauth endpoints

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.FileStateStore = void 0;
const node_fs_1 = __importDefault(require("node:fs"));
const node_os_1 = require("node:os");
const node_path_1 = __importDefault(require("node:path"));
const logger_1 = require("@slack/logger");
const errors_1 = require("../errors");
class FileStateStore {
    constructor(args) {
        this.baseDir = args.baseDir !== undefined ? args.baseDir : `${(0, node_os_1.homedir)()}/.bolt-js-oauth-states`;
        this.stateExpirationSeconds = args.stateExpirationSeconds !== undefined ? args.stateExpirationSeconds : 600;
        this.logger = args.logger !== undefined ? args.logger : new logger_1.ConsoleLogger();
    }
    async generateStateParam(installOptions, now) {
        let state = generateRandomString();
        while (this.alreadyExists(state)) {
            // Still race condition can arise here
            state = generateRandomString();
        }
        const source = { installOptions, now };
        this.writeToFile(state, source);
        return state;
    }
    async verifyStateParam(now, state) {
        try {
            // decode the state using the secret
            let decoded;
            try {
                decoded = this.readFile(state);
            }
            catch (e) {
                const message = `Failed to load the data represented by the state parameter (error: ${e})`;
                throw new errors_1.InvalidStateError(message);
            }
            if (decoded !== undefined) {
                // Check if the state value is not too old
                const generatedAt = new Date(decoded.now);
                const passedSeconds = Math.floor((now.getTime() - generatedAt.getTime()) / 1000);
                if (passedSeconds > this.stateExpirationSeconds) {
                    throw new errors_1.InvalidStateError('The state value is already expired');
                }
                // return installOptions
                return decoded.installOptions;
            }
        }
        finally {
            this.deleteFile(state);
        }
        throw new errors_1.InvalidStateError('The state value is already expired');
    }
    // -------------------------------------------
    // private methods
    // -------------------------------------------
    alreadyExists(filename) {
        const fullpath = node_path_1.default.resolve(`${this.baseDir}/${filename}`);
        return node_fs_1.default.existsSync(fullpath);
    }
    writeToFile(filename, data) {
        node_fs_1.default.mkdirSync(this.baseDir, { recursive: true });
        const fullpath = node_path_1.default.resolve(`${this.baseDir}/${filename}`);
        node_fs_1.default.writeFileSync(fullpath, JSON.stringify(data));
    }
    readFile(filename) {
        const fullpath = node_path_1.default.resolve(`${this.baseDir}/${filename}`);
        try {
            const data = node_fs_1.default.readFileSync(fullpath);
            if (data !== undefined) {
                return JSON.parse(data.toString());
            }
            return undefined;
        }
        catch (e) {
            this.logger.debug(`Failed to load state data from file (error: ${e})`);
            return undefined;
        }
    }
    deleteFile(filename) {
        const fullpath = node_path_1.default.resolve(`${this.baseDir}/${filename}`);
        if (node_fs_1.default.existsSync(fullpath)) {
            node_fs_1.default.unlinkSync(fullpath);
        }
    }
}
exports.FileStateStore = FileStateStore;
const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
function generateRandomString(length = 10) {
    let generated = '';
    for (let i = 0; i < length; i += 1) {
        const position = Math.floor(Math.random() * chars.length);
        generated += chars.charAt(position);
    }
    return generated;
}
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