mjolnir/src/config.ts

/*
Copyright 2019, 2021 The Matrix.org Foundation C.I.C.

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.
*/

import * as fs from "fs";
import { load } from "js-yaml";
import { MatrixClient } from "matrix-bot-sdk";
import Config from "config";

/**
 * The configuration, as read from production.yaml
 *
 * See file default.yaml for the documentation on individual options.
 */
// The object is magically generated by external lib `config`
// from the file specified by `NODE_ENV`, e.g. production.yaml
// or harness.yaml.
export interface IConfig {
    homeserverUrl: string;
    rawHomeserverUrl: string;
    accessToken: string;
    pantalaimon: {
        use: boolean;
        username: string;
        password: string;
    };
    dataPath: string;
    acceptInvitesFromSpace: string;
    autojoinOnlyIfManager: boolean;
    recordIgnoredInvites: boolean;
    managementRoom: string;
    verboseLogging: boolean;
    logLevel: "DEBUG" | "INFO" | "WARN" | "ERROR";
    syncOnStartup: boolean;
    verifyPermissionsOnStartup: boolean;
    noop: boolean;
    protectedRooms: string[]; // matrix.to urls
    fasterMembershipChecks: boolean;
    automaticallyRedactForReasons: string[]; // case-insensitive globs
    protectAllJoinedRooms: boolean;
    /**
     * Backgrounded tasks: number of milliseconds to wait between the completion
     * of one background task and the start of the next one.
     */
    backgroundDelayMS: number;
    pollReports: boolean;
    /**
     * Whether or not new reports, received either by webapi or polling,
     * should be printed to our managementRoom.
     */
    displayReports: boolean;
    admin?: {
        enableMakeRoomAdminCommand?: boolean;
    }
    commands: {
        allowNoPrefix: boolean;
        additionalPrefixes: string[];
        confirmWildcardBan: boolean;
    };
    protections: {
        wordlist: {
            words: string[];
            minutesBeforeTrusting: number;
        };
    };
    health: {
        healthz: {
            enabled: boolean;
            port: number;
            address: string;
            endpoint: string;
            healthyStatus: number;
            unhealthyStatus: number;
        };
    };
    web: {
        enabled: boolean;
        port: number;
        address: string;
        abuseReporting: {
            enabled: boolean;
        }
        ruleServer?: {
            enabled: boolean;
        }
    }

    /**
     * Config options only set at runtime. Try to avoid using the objects
     * here as much as possible.
     */
    RUNTIME: {
        client?: MatrixClient;
    };
}

const defaultConfig: IConfig = {
    homeserverUrl: "http://localhost:8008",
    rawHomeserverUrl: "http://localhost:8008",
    accessToken: "NONE_PROVIDED",
    pantalaimon: {
        use: false,
        username: "",
        password: "",
    },
    dataPath: "/data/storage",
    acceptInvitesFromSpace: '!noop:example.org',
    autojoinOnlyIfManager: false,
    recordIgnoredInvites: false,
    managementRoom: "!noop:example.org",
    verboseLogging: false,
    logLevel: "INFO",
    syncOnStartup: true,
    verifyPermissionsOnStartup: true,
    noop: false,
    protectedRooms: [],
    fasterMembershipChecks: false,
    automaticallyRedactForReasons: ["spam", "advertising"],
    protectAllJoinedRooms: false,
    backgroundDelayMS: 500,
    pollReports: false,
    displayReports: true,
    commands: {
        allowNoPrefix: false,
        additionalPrefixes: [],
        confirmWildcardBan: true,
    },
    protections: {
        wordlist: {
            words: [],
            minutesBeforeTrusting: 20
        }
    },
    health: {
        healthz: {
            enabled: false,
            port: 8080,
            address: "0.0.0.0",
            endpoint: "/healthz",
            healthyStatus: 200,
            unhealthyStatus: 418,
        },
    },
    web: {
        enabled: false,
        port: 8080,
        address: "localhost",
        abuseReporting: {
            enabled: false,
        },
        ruleServer: {
            enabled: false,
        },
    },

    // Needed to make the interface happy.
    RUNTIME: {
    },
};

/**
 * Grabs an explicit path provided for mjolnir's config from an arguments vector if provided, otherwise returns undefined.
 * @param argv An arguments vector sourced from `process.argv`.
 * @returns The path if one was provided or undefined.
 */
function configPathFromArguments(argv: string[]): undefined|string {
    const configOptionIndex = argv.findIndex(arg => arg === "--mjolnir-config");
    if (configOptionIndex > 0) {
        const configOptionPath = argv.at(configOptionIndex + 1);
        if (!configOptionPath) {
            throw new Error("No path provided with option --mjolnir-config");
        }
        return configOptionPath;
    } else {
        return;
    }
}

export function read(): IConfig {
    const explicitConfigPath = configPathFromArguments(process.argv);
    if (explicitConfigPath) {
        const content = fs.readFileSync(explicitConfigPath, "utf8");
        const parsed = load(content);
        return Config.util.extendDeep({}, defaultConfig, parsed);
    } else {
        const config = Config.util.extendDeep({}, defaultConfig, Config.util.toObject()) as IConfig;
        return config;
    }
}