etherpad-lite/src/node/utils/Settings.js

870 lines
27 KiB
JavaScript

'use strict';
/**
* The Settings module reads the settings out of settings.json and provides
* this information to the other modules
*
* TODO muxator 2020-04-14:
*
* 1) get rid of the reloadSettings() call at module loading;
* 2) provide a factory method that configures the settings module at runtime,
* reading the file name either from command line parameters, from a function
* argument, or falling back to a default.
*/
/*
* 2011 Peter 'Pita' Martischka (Primary Technology Ltd)
*
* 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.
*/
const absolutePaths = require('./AbsolutePaths');
const deepEqual = require('fast-deep-equal/es6');
const fs = require('fs');
const os = require('os');
const path = require('path');
const argv = require('./Cli').argv;
const jsonminify = require('jsonminify');
const log4js = require('log4js');
const randomString = require('./randomstring');
const suppressDisableMsg = ' -- To suppress these warning messages change ' +
'suppressErrorsInPadText to true in your settings.json\n';
const _ = require('underscore');
const logger = log4js.getLogger('settings');
// Exported values that settings.json and credentials.json cannot override.
const nonSettings = [
'credentialsFilename',
'settingsFilename',
];
// This is a function to make it easy to create a new instance. It is important to not reuse a
// config object after passing it to log4js.configure() because that method mutates the object. :(
const defaultLogConfig = () => ({appenders: [{type: 'console'}]});
const defaultLogLevel = 'INFO';
const initLogging = (logLevel, config) => {
// log4js.configure() modifies exports.logconfig so check for equality first.
const logConfigIsDefault = deepEqual(config, defaultLogConfig());
log4js.configure(config);
log4js.setGlobalLogLevel(logLevel);
log4js.replaceConsole();
// Log the warning after configuring log4js to increase the chances the user will see it.
if (!logConfigIsDefault) logger.warn('The logconfig setting is deprecated.');
};
// Initialize logging as early as possible with reasonable defaults. Logging will be re-initialized
// with the user's chosen log level and logger config after the settings have been loaded.
initLogging(defaultLogLevel, defaultLogConfig());
/* Root path of the installation */
exports.root = absolutePaths.findEtherpadRoot();
logger.info('All relative paths will be interpreted relative to the identified ' +
`Etherpad base dir: ${exports.root}`);
exports.settingsFilename = absolutePaths.makeAbsolute(argv.settings || 'settings.json');
exports.credentialsFilename = absolutePaths.makeAbsolute(argv.credentials || 'credentials.json');
/**
* The app title, visible e.g. in the browser window
*/
exports.title = 'Etherpad';
/**
* Pathname of the favicon you want to use. If null, the skin's favicon is
* used if one is provided by the skin, otherwise the default Etherpad favicon
* is used. If this is a relative path it is interpreted as relative to the
* Etherpad root directory.
*/
exports.favicon = null;
/*
* Skin name.
*
* Initialized to null, so we can spot an old configuration file and invite the
* user to update it before falling back to the default.
*/
exports.skinName = null;
exports.skinVariants = 'super-light-toolbar super-light-editor light-background';
/**
* The IP ep-lite should listen to
*/
exports.ip = '0.0.0.0';
/**
* The Port ep-lite should listen to
*/
exports.port = process.env.PORT || 9001;
/**
* Should we suppress Error messages from being in Pad Contents
*/
exports.suppressErrorsInPadText = false;
/**
* The SSL signed server key and the Certificate Authority's own certificate
* default case: ep-lite does *not* use SSL. A signed server key is not required in this case.
*/
exports.ssl = false;
/**
* socket.io transport methods
**/
exports.socketTransportProtocols = ['xhr-polling', 'jsonp-polling', 'htmlfile'];
exports.socketIo = {
/**
* Maximum permitted client message size (in bytes).
*
* All messages from clients that are larger than this will be rejected. Large values make it
* possible to paste large amounts of text, and plugins may require a larger value to work
* properly, but increasing the value increases susceptibility to denial of service attacks
* (malicious clients can exhaust memory).
*/
maxHttpBufferSize: 10000,
};
/*
* The Type of the database
*/
exports.dbType = 'dirty';
/**
* This setting is passed with dbType to ueberDB to set up the database
*/
exports.dbSettings = {filename: path.join(exports.root, 'var/dirty.db')};
/**
* The default Text of a new pad
*/
exports.defaultPadText = [
'Welcome to Etherpad!',
'',
'This pad text is synchronized as you type, so that everyone viewing this page sees the same ' +
'text. This allows you to collaborate seamlessly on documents!',
'',
'Etherpad on Github: https://github.com/ether/etherpad-lite',
].join('\n');
/**
* The default Pad Settings for a user (Can be overridden by changing the setting
*/
exports.padOptions = {
noColors: false,
showControls: true,
showChat: true,
showLineNumbers: true,
useMonospaceFont: false,
userName: null,
userColor: null,
rtl: false,
alwaysShowChat: false,
chatAndUsers: false,
lang: null,
};
/**
* Whether certain shortcut keys are enabled for a user in the pad
*/
exports.padShortcutEnabled = {
altF9: true,
altC: true,
delete: true,
cmdShift2: true,
return: true,
esc: true,
cmdS: true,
tab: true,
cmdZ: true,
cmdY: true,
cmdB: true,
cmdI: true,
cmdU: true,
cmd5: true,
cmdShiftL: true,
cmdShiftN: true,
cmdShift1: true,
cmdShiftC: true,
cmdH: true,
ctrlHome: true,
pageUp: true,
pageDown: true,
};
/**
* The toolbar buttons and order.
*/
exports.toolbar = {
left: [
['bold', 'italic', 'underline', 'strikethrough'],
['orderedlist', 'unorderedlist', 'indent', 'outdent'],
['undo', 'redo'],
['clearauthorship'],
],
right: [
['importexport', 'timeslider', 'savedrevision'],
['settings', 'embed'],
['showusers'],
],
timeslider: [
['timeslider_export', 'timeslider_settings', 'timeslider_returnToPad'],
],
};
/**
* A flag that requires any user to have a valid session (via the api) before accessing a pad
*/
exports.requireSession = false;
/**
* A flag that prevents users from creating new pads
*/
exports.editOnly = false;
/**
* Max age that responses will have (affects caching layer).
*/
exports.maxAge = 1000 * 60 * 60 * 6; // 6 hours
/**
* A flag that shows if minification is enabled or not
*/
exports.minify = true;
/**
* The path of the abiword executable
*/
exports.abiword = null;
/**
* The path of the libreoffice executable
*/
exports.soffice = null;
/**
* The path of the tidy executable
*/
exports.tidyHtml = null;
/**
* Should we support none natively supported file types on import?
*/
exports.allowUnknownFileEnds = true;
/**
* The log level of log4js
*/
exports.loglevel = defaultLogLevel;
/**
* Disable IP logging
*/
exports.disableIPlogging = false;
/**
* Number of seconds to automatically reconnect pad
*/
exports.automaticReconnectionTimeout = 0;
/**
* Disable Load Testing
*/
exports.loadTest = false;
/**
* Disable dump of objects preventing a clean exit
*/
exports.dumpOnUncleanExit = false;
/**
* Enable indentation on new lines
*/
exports.indentationOnNewLine = true;
/*
* log4js appender configuration
*/
exports.logconfig = defaultLogConfig();
/*
* Deprecated cookie signing key.
*/
exports.sessionKey = null;
/*
* Trust Proxy, whether or not trust the x-forwarded-for header.
*/
exports.trustProxy = false;
/*
* Settings controlling the session cookie issued by Etherpad.
*/
exports.cookie = {
keyRotationInterval: 1 * 24 * 60 * 60 * 1000,
/*
* Value of the SameSite cookie property. "Lax" is recommended unless
* Etherpad will be embedded in an iframe from another site, in which case
* this must be set to "None". Note: "None" will not work (the browser will
* not send the cookie to Etherpad) unless https is used to access Etherpad
* (either directly or via a reverse proxy with "trustProxy" set to true).
*
* "Strict" is not recommended because it has few security benefits but
* significant usability drawbacks vs. "Lax". See
* https://stackoverflow.com/q/41841880 for discussion.
*/
sameSite: 'Lax',
sessionLifetime: 10 * 24 * 60 * 60 * 1000,
sessionRefreshInterval: 1 * 24 * 60 * 60 * 1000,
};
/*
* This setting is used if you need authentication and/or
* authorization. Note: /admin always requires authentication, and
* either authorization by a module, or a user with is_admin set
*/
exports.requireAuthentication = false;
exports.requireAuthorization = false;
exports.users = {};
/*
* Show settings in admin page, by default it is true
*/
exports.showSettingsInAdminPage = true;
/*
* By default, when caret is moved out of viewport, it scrolls the minimum
* height needed to make this line visible.
*/
exports.scrollWhenFocusLineIsOutOfViewport = {
/*
* Percentage of viewport height to be additionally scrolled.
*/
percentage: {
editionAboveViewport: 0,
editionBelowViewport: 0,
},
/*
* Time (in milliseconds) used to animate the scroll transition. Set to 0 to
* disable animation
*/
duration: 0,
/*
* Percentage of viewport height to be additionally scrolled when user presses arrow up
* in the line of the top of the viewport.
*/
percentageToScrollWhenUserPressesArrowUp: 0,
/*
* Flag to control if it should scroll when user places the caret in the last
* line of the viewport
*/
scrollWhenCaretIsInTheLastLineOfViewport: false,
};
/*
* Expose Etherpad version in the web interface and in the Server http header.
*
* Do not enable on production machines.
*/
exports.exposeVersion = false;
/*
* Override any strings found in locale directories
*/
exports.customLocaleStrings = {};
/*
* From Etherpad 1.8.3 onwards, import and export of pads is always rate
* limited.
*
* The default is to allow at most 10 requests per IP in a 90 seconds window.
* After that the import/export request is rejected.
*
* See https://github.com/nfriedly/express-rate-limit for more options
*/
exports.importExportRateLimiting = {
// duration of the rate limit window (milliseconds)
windowMs: 90000,
// maximum number of requests per IP to allow during the rate limit window
max: 10,
};
/*
* From Etherpad 1.9.0 onwards, commits from individual users are rate limited
*
* The default is to allow at most 10 changes per IP in a 1 second window.
* After that the change is rejected.
*
* See https://github.com/animir/node-rate-limiter-flexible/wiki/Overall-example#websocket-single-connection-prevent-flooding for more options
*/
exports.commitRateLimiting = {
// duration of the rate limit window (seconds)
duration: 1,
// maximum number of chanes per IP to allow during the rate limit window
points: 10,
};
/*
* From Etherpad 1.8.3 onwards, the maximum allowed size for a single imported
* file is always bounded.
*
* File size is specified in bytes. Default is 50 MB.
*/
exports.importMaxFileSize = 50 * 1024 * 1024;
/*
* Disable Admin UI tests
*/
exports.enableAdminUITests = false;
/*
* Enable auto conversion of pad Ids to lowercase.
* e.g. /p/EtHeRpAd to /p/etherpad
*/
exports.lowerCasePadIds = false;
// checks if abiword is avaiable
exports.abiwordAvailable = () => {
if (exports.abiword != null) {
return os.type().indexOf('Windows') !== -1 ? 'withoutPDF' : 'yes';
} else {
return 'no';
}
};
exports.sofficeAvailable = () => {
if (exports.soffice != null) {
return os.type().indexOf('Windows') !== -1 ? 'withoutPDF' : 'yes';
} else {
return 'no';
}
};
exports.exportAvailable = () => {
const abiword = exports.abiwordAvailable();
const soffice = exports.sofficeAvailable();
if (abiword === 'no' && soffice === 'no') {
return 'no';
} else if ((abiword === 'withoutPDF' && soffice === 'no') ||
(abiword === 'no' && soffice === 'withoutPDF')) {
return 'withoutPDF';
} else {
return 'yes';
}
};
// Provide git version if available
exports.getGitCommit = () => {
let version = '';
try {
let rootPath = exports.root;
if (fs.lstatSync(`${rootPath}/.git`).isFile()) {
rootPath = fs.readFileSync(`${rootPath}/.git`, 'utf8');
rootPath = rootPath.split(' ').pop().trim();
} else {
rootPath += '/.git';
}
const ref = fs.readFileSync(`${rootPath}/HEAD`, 'utf-8');
if (ref.startsWith('ref: ')) {
const refPath = `${rootPath}/${ref.substring(5, ref.indexOf('\n'))}`;
version = fs.readFileSync(refPath, 'utf-8');
} else {
version = ref;
}
version = version.substring(0, 7);
} catch (e) {
logger.warn(`Can't get git version for server header\n${e.message}`);
}
return version;
};
// Return etherpad version from package.json
exports.getEpVersion = () => require('../../package.json').version;
/**
* Receives a settingsObj and, if the property name is a valid configuration
* item, stores it in the module's exported properties via a side effect.
*
* This code refactors a previous version that copied & pasted the same code for
* both "settings.json" and "credentials.json".
*/
const storeSettings = (settingsObj) => {
for (const i of Object.keys(settingsObj || {})) {
if (nonSettings.includes(i)) {
logger.warn(`Ignoring setting: '${i}'`);
continue;
}
// test if the setting starts with a lowercase character
if (i.charAt(0).search('[a-z]') !== 0) {
logger.warn(`Settings should start with a lowercase character: '${i}'`);
}
// we know this setting, so we overwrite it
// or it's a settings hash, specific to a plugin
if (exports[i] !== undefined || i.indexOf('ep_') === 0) {
if (_.isObject(settingsObj[i]) && !Array.isArray(settingsObj[i])) {
exports[i] = _.defaults(settingsObj[i], exports[i]);
} else {
exports[i] = settingsObj[i];
}
} else {
// this setting is unknown, output a warning and throw it away
logger.warn(`Unknown Setting: '${i}'. This setting doesn't exist or it was removed`);
}
}
};
/*
* If stringValue is a numeric string, or its value is "true" or "false", coerce
* them to appropriate JS types. Otherwise return stringValue as-is.
*
* Please note that this function is used for converting types for default
* values in the settings file (for example: "${PORT:9001}"), and that there is
* no coercition for "null" values.
*
* If the user wants a variable to be null by default, he'll have to use the
* short syntax "${ABIWORD}", and not "${ABIWORD:null}": the latter would result
* in the literal string "null", instead.
*/
const coerceValue = (stringValue) => {
// cooked from https://stackoverflow.com/questions/175739/built-in-way-in-javascript-to-check-if-a-string-is-a-valid-number
const isNumeric = !isNaN(stringValue) && !isNaN(parseFloat(stringValue) && isFinite(stringValue));
if (isNumeric) {
// detected numeric string. Coerce to a number
return +stringValue;
}
switch (stringValue) {
case 'true': return true;
case 'false': return false;
case 'undefined': return undefined;
case 'null': return null;
default: return stringValue;
}
};
/**
* Takes a javascript object containing Etherpad's configuration, and returns
* another object, in which all the string properties whose value is of the form
* "${ENV_VAR}" or "${ENV_VAR:default_value}" got their value replaced with the
* contents of the given environment variable, or with a default value.
*
* By definition, an environment variable's value is always a string. However,
* the code base makes use of the various json types. To maintain compatiblity,
* some heuristics is applied:
*
* - if ENV_VAR does not exist in the environment, null is returned;
* - if ENV_VAR's value is "true" or "false", it is converted to the js boolean
* values true or false;
* - if ENV_VAR's value looks like a number, it is converted to a js number
* (details in the code).
*
* The following is a scheme of the behaviour of this function:
*
* +---------------------------+---------------+------------------+
* | Configuration string in | Value of | Resulting confi- |
* | settings.json | ENV_VAR | guration value |
* |---------------------------|---------------|------------------|
* | "${ENV_VAR}" | "some_string" | "some_string" |
* | "${ENV_VAR}" | "9001" | 9001 |
* | "${ENV_VAR}" | undefined | null |
* | "${ENV_VAR:some_default}" | "some_string" | "some_string" |
* | "${ENV_VAR:some_default}" | undefined | "some_default" |
* +---------------------------+---------------+------------------+
*
* IMPLEMENTATION NOTE: variable substitution is performed doing a round trip
* conversion to/from json, using a custom replacer parameter in
* JSON.stringify(), and parsing the JSON back again. This ensures that
* environment variable replacement is performed even on nested objects.
*
* see: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify#The_replacer_parameter
*/
const lookupEnvironmentVariables = (obj) => {
const stringifiedAndReplaced = JSON.stringify(obj, (key, value) => {
/*
* the first invocation of replacer() is with an empty key. Just go on, or
* we would zap the entire object.
*/
if (key === '') {
return value;
}
/*
* If we received from the configuration file a number, a boolean or
* something that is not a string, we can be sure that it was a literal
* value. No need to perform any variable substitution.
*
* The environment variable expansion syntax "${ENV_VAR}" is just a string
* of specific form, after all.
*/
if (typeof value !== 'string') {
return value;
}
/*
* Let's check if the string value looks like a variable expansion (e.g.:
* "${ENV_VAR}" or "${ENV_VAR:default_value}")
*/
// MUXATOR 2019-03-21: we could use named capture groups here once we migrate to nodejs v10
const match = value.match(/^\$\{([^:]*)(:((.|\n)*))?\}$/);
if (match == null) {
// no match: use the value literally, without any substitution
return value;
}
/*
* We found the name of an environment variable. Let's read its actual value
* and its default value, if given
*/
const envVarName = match[1];
const envVarValue = process.env[envVarName];
const defaultValue = match[3];
if ((envVarValue === undefined) && (defaultValue === undefined)) {
logger.warn(`Environment variable "${envVarName}" does not contain any value for ` +
`configuration key "${key}", and no default was given. Using null. ` +
'THIS BEHAVIOR MAY CHANGE IN A FUTURE VERSION OF ETHERPAD; you should ' +
'explicitly use "null" as the default if you want to continue to use null.');
/*
* We have to return null, because if we just returned undefined, the
* configuration item "key" would be stripped from the returned object.
*/
return null;
}
if ((envVarValue === undefined) && (defaultValue !== undefined)) {
logger.debug(`Environment variable "${envVarName}" not found for ` +
`configuration key "${key}". Falling back to default value.`);
return coerceValue(defaultValue);
}
// envVarName contained some value.
/*
* For numeric and boolean strings let's convert it to proper types before
* returning it, in order to maintain backward compatibility.
*/
logger.debug(
`Configuration key "${key}" will be read from environment variable "${envVarName}"`);
return coerceValue(envVarValue);
});
const newSettings = JSON.parse(stringifiedAndReplaced);
return newSettings;
};
/**
* - reads the JSON configuration file settingsFilename from disk
* - strips the comments
* - replaces environment variables calling lookupEnvironmentVariables()
* - returns a parsed Javascript object
*
* The isSettings variable only controls the error logging.
*/
const parseSettings = (settingsFilename, isSettings) => {
let settingsStr = '';
let settingsType, notFoundMessage, notFoundFunction;
if (isSettings) {
settingsType = 'settings';
notFoundMessage = 'Continuing using defaults!';
notFoundFunction = logger.warn.bind(logger);
} else {
settingsType = 'credentials';
notFoundMessage = 'Ignoring.';
notFoundFunction = logger.info.bind(logger);
}
try {
// read the settings file
settingsStr = fs.readFileSync(settingsFilename).toString();
} catch (e) {
notFoundFunction(`No ${settingsType} file found in ${settingsFilename}. ${notFoundMessage}`);
// or maybe undefined!
return null;
}
try {
settingsStr = jsonminify(settingsStr).replace(',]', ']').replace(',}', '}');
const settings = JSON.parse(settingsStr);
logger.info(`${settingsType} loaded from: ${settingsFilename}`);
const replacedSettings = lookupEnvironmentVariables(settings);
return replacedSettings;
} catch (e) {
logger.error(`There was an error processing your ${settingsType} ` +
`file from ${settingsFilename}: ${e.message}`);
process.exit(1);
}
};
exports.reloadSettings = () => {
const settings = parseSettings(exports.settingsFilename, true);
const credentials = parseSettings(exports.credentialsFilename, false);
storeSettings(settings);
storeSettings(credentials);
initLogging(exports.loglevel, exports.logconfig);
if (!exports.skinName) {
logger.warn('No "skinName" parameter found. Please check out settings.json.template and ' +
'update your settings.json. Falling back to the default "colibris".');
exports.skinName = 'colibris';
}
// checks if skinName has an acceptable value, otherwise falls back to "colibris"
if (exports.skinName) {
const skinBasePath = path.join(exports.root, 'src', 'static', 'skins');
const countPieces = exports.skinName.split(path.sep).length;
if (countPieces !== 1) {
logger.error(`skinName must be the name of a directory under "${skinBasePath}". This is ` +
`not valid: "${exports.skinName}". Falling back to the default "colibris".`);
exports.skinName = 'colibris';
}
// informative variable, just for the log messages
let skinPath = path.join(skinBasePath, exports.skinName);
// what if someone sets skinName == ".." or "."? We catch him!
if (absolutePaths.isSubdir(skinBasePath, skinPath) === false) {
logger.error(`Skin path ${skinPath} must be a subdirectory of ${skinBasePath}. ` +
'Falling back to the default "colibris".');
exports.skinName = 'colibris';
skinPath = path.join(skinBasePath, exports.skinName);
}
if (fs.existsSync(skinPath) === false) {
logger.error(`Skin path ${skinPath} does not exist. Falling back to the default "colibris".`);
exports.skinName = 'colibris';
skinPath = path.join(skinBasePath, exports.skinName);
}
logger.info(`Using skin "${exports.skinName}" in dir: ${skinPath}`);
}
if (exports.abiword) {
// Check abiword actually exists
if (exports.abiword != null) {
fs.exists(exports.abiword, (exists) => {
if (!exists) {
const abiwordError = 'Abiword does not exist at this path, check your settings file.';
if (!exports.suppressErrorsInPadText) {
exports.defaultPadText += `\nError: ${abiwordError}${suppressDisableMsg}`;
}
logger.error(`${abiwordError} File location: ${exports.abiword}`);
exports.abiword = null;
}
});
}
}
if (exports.soffice) {
fs.exists(exports.soffice, (exists) => {
if (!exists) {
const sofficeError =
'soffice (libreoffice) does not exist at this path, check your settings file.';
if (!exports.suppressErrorsInPadText) {
exports.defaultPadText += `\nError: ${sofficeError}${suppressDisableMsg}`;
}
logger.error(`${sofficeError} File location: ${exports.soffice}`);
exports.soffice = null;
}
});
}
const sessionkeyFilename = absolutePaths.makeAbsolute(argv.sessionkey || './SESSIONKEY.txt');
if (!exports.sessionKey) {
try {
exports.sessionKey = fs.readFileSync(sessionkeyFilename, 'utf8');
logger.info(`Session key loaded from: ${sessionkeyFilename}`);
} catch (err) { /* ignored */ }
const keyRotationEnabled = exports.cookie.keyRotationInterval && exports.cookie.sessionLifetime;
if (!exports.sessionKey && !keyRotationEnabled) {
logger.info(
`Session key file "${sessionkeyFilename}" not found. Creating with random contents.`);
exports.sessionKey = randomString(32);
fs.writeFileSync(sessionkeyFilename, exports.sessionKey, 'utf8');
}
} else {
logger.warn('Declaring the sessionKey in the settings.json is deprecated. ' +
'This value is auto-generated now. Please remove the setting from the file. -- ' +
'If you are seeing this error after restarting using the Admin User ' +
'Interface then you can ignore this message.');
}
if (exports.sessionKey) {
logger.warn(`The sessionKey setting and ${sessionkeyFilename} file are deprecated; ` +
'use automatic key rotation instead (see the cookie.keyRotationInterval setting).');
}
if (exports.dbType === 'dirty') {
const dirtyWarning = 'DirtyDB is used. This is not recommended for production.';
if (!exports.suppressErrorsInPadText) {
exports.defaultPadText += `\nWarning: ${dirtyWarning}${suppressDisableMsg}`;
}
exports.dbSettings.filename = absolutePaths.makeAbsolute(exports.dbSettings.filename);
logger.warn(`${dirtyWarning} File location: ${exports.dbSettings.filename}`);
}
if (exports.ip === '') {
// using Unix socket for connectivity
logger.warn('The settings file contains an empty string ("") for the "ip" parameter. The ' +
'"port" parameter will be interpreted as the path to a Unix socket to bind at.');
}
/*
* At each start, Etherpad generates a random string and appends it as query
* parameter to the URLs of the static assets, in order to force their reload.
* Subsequent requests will be cached, as long as the server is not reloaded.
*
* For the rationale behind this choice, see
* https://github.com/ether/etherpad-lite/pull/3958
*
* ACHTUNG: this may prevent caching HTTP proxies to work
* TODO: remove the "?v=randomstring" parameter, and replace with hashed filenames instead
*/
exports.randomVersionString = randomString(4);
logger.info(`Random string used for versioning assets: ${exports.randomVersionString}`);
};
exports.exportedForTestingOnly = {
parseSettings,
};
// initially load settings
exports.reloadSettings();