signal-desktop/js/modules/privacy.js
2018-04-11 15:54:32 -04:00

88 lines
2.3 KiB
JavaScript

/* eslint-env node */
const is = require('@sindresorhus/is');
const path = require('path');
const { compose } = require('lodash/fp');
const { escapeRegExp } = require('lodash');
const APP_ROOT_PATH = path.join(__dirname, '..', '..', '..');
const PHONE_NUMBER_PATTERN = /\+\d{7,12}(\d{3})/g;
const GROUP_ID_PATTERN = /(group\()([^)]+)(\))/g;
const REDACTION_PLACEHOLDER = '[REDACTED]';
// _redactPath :: Path -> String -> String
exports._redactPath = (filePath) => {
if (!is.string(filePath)) {
throw new TypeError("'filePath' must be a string");
}
const filePathPattern = exports._pathToRegExp(filePath);
return (text) => {
if (!is.string(text)) {
throw new TypeError("'text' must be a string");
}
if (!is.regExp(filePathPattern)) {
return text;
}
return text.replace(filePathPattern, REDACTION_PLACEHOLDER);
};
};
// _pathToRegExp :: Path -> Maybe RegExp
exports._pathToRegExp = (filePath) => {
try {
const pathWithNormalizedSlashes = filePath.replace(/\//g, '\\');
const pathWithEscapedSlashes = filePath.replace(/\\/g, '\\\\');
const urlEncodedPath = encodeURI(filePath);
// Safe `String::replaceAll`:
// https://github.com/lodash/lodash/issues/1084#issuecomment-86698786
const patternString = [
filePath,
pathWithNormalizedSlashes,
pathWithEscapedSlashes,
urlEncodedPath,
].map(escapeRegExp).join('|');
return new RegExp(patternString, 'g');
} catch (error) {
return null;
}
};
// Public API
// redactPhoneNumbers :: String -> String
exports.redactPhoneNumbers = (text) => {
if (!is.string(text)) {
throw new TypeError("'text' must be a string");
}
return text.replace(PHONE_NUMBER_PATTERN, `+${REDACTION_PLACEHOLDER}$1`);
};
// redactGroupIds :: String -> String
exports.redactGroupIds = (text) => {
if (!is.string(text)) {
throw new TypeError("'text' must be a string");
}
return text.replace(
GROUP_ID_PATTERN,
(match, before, id, after) =>
`${before}${REDACTION_PLACEHOLDER}${id.slice(-3)}${after}`
);
};
// redactSensitivePaths :: String -> String
exports.redactSensitivePaths = exports._redactPath(APP_ROOT_PATH);
// redactAll :: String -> String
exports.redactAll = compose(
exports.redactSensitivePaths,
exports.redactGroupIds,
exports.redactPhoneNumbers
);