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/**
* @fileoverview Restrict usage of specified node modules.
* @author Christian Schulz
*/
"use strict";
//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------
const DEFAULT_MESSAGE_TEMPLATE = "'{{moduleName}}' module is restricted from being used.";
const CUSTOM_MESSAGE_TEMPLATE = "'{{moduleName}}' module is restricted from being used. {{customMessage}}";
//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------
const ignore = require("ignore");
const arrayOfStrings = {
type: "array",
items: { type: "string" },
uniqueItems: true
};
const arrayOfStringsOrObjects = {
type: "array",
items: {
anyOf: [
{ type: "string" },
{
type: "object",
properties: {
name: { type: "string" },
message: {
type: "string",
minLength: 1
}
},
additionalProperties: false,
required: ["name"]
}
]
},
uniqueItems: true
};
module.exports = {
meta: {
docs: {
description: "disallow specified modules when loaded by `require`",
category: "Node.js and CommonJS",
recommended: false
},
schema: {
anyOf: [
arrayOfStringsOrObjects,
{
type: "array",
items: {
type: "object",
properties: {
paths: arrayOfStringsOrObjects,
patterns: arrayOfStrings
},
additionalProperties: false
},
additionalItems: false
}
]
}
},
create(context) {
const options = Array.isArray(context.options) ? context.options : [];
const isPathAndPatternsObject =
typeof options[0] === "object" &&
(options[0].hasOwnProperty("paths") || options[0].hasOwnProperty("patterns"));
const restrictedPaths = (isPathAndPatternsObject ? options[0].paths : context.options) || [];
const restrictedPatterns = (isPathAndPatternsObject ? options[0].patterns : []) || [];
const restrictedPathMessages = restrictedPaths.reduce((memo, importName) => {
if (typeof importName === "string") {
memo[importName] = null;
} else {
memo[importName.name] = importName.message;
}
return memo;
}, {});
// if no imports are restricted we don"t need to check
if (Object.keys(restrictedPaths).length === 0 && restrictedPatterns.length === 0) {
return {};
}
const ig = ignore().add(restrictedPatterns);
/**
* Function to check if a node is a string literal.
* @param {ASTNode} node The node to check.
* @returns {boolean} If the node is a string literal.
*/
function isString(node) {
return node && node.type === "Literal" && typeof node.value === "string";
}
/**
* Function to check if a node is a require call.
* @param {ASTNode} node The node to check.
* @returns {boolean} If the node is a require call.
*/
function isRequireCall(node) {
return node.callee.type === "Identifier" && node.callee.name === "require";
}
/**
* Report a restricted path.
* @param {node} node representing the restricted path reference
* @returns {void}
* @private
*/
function reportPath(node) {
const moduleName = node.arguments[0].value.trim();
const customMessage = restrictedPathMessages[moduleName];
const message = customMessage
? CUSTOM_MESSAGE_TEMPLATE
: DEFAULT_MESSAGE_TEMPLATE;
context.report({
node,
message,
data: {
moduleName,
customMessage
}
});
}
/**
* Check if the given name is a restricted path name
* @param {string} name name of a variable
* @returns {boolean} whether the variable is a restricted path or not
* @private
*/
function isRestrictedPath(name) {
return Object.prototype.hasOwnProperty.call(restrictedPathMessages, name);
}
return {
CallExpression(node) {
if (isRequireCall(node)) {
// node has arguments and first argument is string
if (node.arguments.length && isString(node.arguments[0])) {
const moduleName = node.arguments[0].value.trim();
// check if argument value is in restricted modules array
if (isRestrictedPath(moduleName)) {
reportPath(node);
}
if (restrictedPatterns.length > 0 && ig.ignores(moduleName)) {
context.report({
node,
message: "'{{moduleName}}' module is restricted from being used by a pattern.",
data: { moduleName }
});
}
}
}
}
};
}
};
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