bhaskargurram-ai commented on code in PR #707: URL: https://github.com/apache/shenyu-dashboard/pull/707#discussion_r4261790463
########## src/utils/regExpRule.js: ########## @@ -0,0 +1,112 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You 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. + */ + +// Plugin handle metadata (extObj.rule) stores optional validation rules as +// regular expression literals such as "/^(true|false)$/" or "/^[a-z]+$/i". +// The value is admin-editable data, so it must be parsed, never evaluated. +const VALID_FLAGS = /^[dgimsuvy]*$/; + +// JavaScript line terminators: LF, CR, LINE SEPARATOR, PARAGRAPH SEPARATOR. +const LINE_TERMINATOR = /[\n\r\u2028\u2029]/; + +// Splits "/source/flags" at the first "/" that closes the literal, following +// JavaScript regular expression literal rules: "\/" and "/" inside a +// character class do not end the literal, and a line terminator (escaped or +// not) is not allowed anywhere in the literal. +function splitRegExpLiteral(literal) { + if (literal[0] !== "/") { + return null; + } + let inClass = false; + for (let i = 1; i < literal.length; i += 1) { + const char = literal[i]; + if (LINE_TERMINATOR.test(char)) { + return null; + } + if (char === "\\") { + i += 1; + if (LINE_TERMINATOR.test(literal[i])) { + return null; + } + } else if (char === "[") { + inClass = true; + } else if (char === "]") { + inClass = false; + } else if (char === "/" && !inClass) { + return { source: literal.slice(1, i), flags: literal.slice(i + 1) }; + } + } + return null; +} + +/** + * Converts a stored check rule into a RegExp without executing it as code. + * + * @param {*} rule rule in "/source/flags" form + * @returns {RegExp|undefined} the parsed RegExp, or undefined when the rule + * is empty or is not a valid regular expression literal + */ +export function parseRegExpRule(rule) { + if (typeof rule !== "string") { + return undefined; + } + const literal = splitRegExpLiteral(rule.trim()); + if (!literal || !literal.source || !VALID_FLAGS.test(literal.flags)) { + return undefined; + } + try { + return new RegExp(literal.source, literal.flags); + } catch (e) { + // Invalid pattern or flag combination (e.g. duplicated flags). + return undefined; + } +} + +const reportedInvalidRules = new Set(); Review Comment: Capped at 100 entries (cleared when full) in 857c7fa. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
