eslint/lib/rules/no-script-url.js

   1 /**
   2  * @fileoverview Rule to flag when using javascript: urls
   3  * @author Ilya Volodin
   4  */
   5 /* eslint no-script-url: 0 -- Code is checking to report such URLs */
   6
   7 "use strict";
   8
   9 const astUtils = require("./utils/ast-utils");
  10
  11 //------------------------------------------------------------------------------
  12 // Rule Definition
  13 //------------------------------------------------------------------------------
  14
  15 /** @type {import('../shared/types').Rule} */
  16 module.exports = {
  17     meta: {
  18         type: "suggestion",
  19
  20         docs: {
  21             description: "Disallow `javascript:` urls",
  22             recommended: false,
  23             url: "https://eslint.org/docs/rules/no-script-url"
  24         },
  25
  26         schema: [],
  27
  28         messages: {
  29             unexpectedScriptURL: "Script URL is a form of eval."
  30         }
  31     },
  32
  33     create(context) {
  34
  35         /**
  36          * Check whether a node's static value starts with "javascript:" or not.
  37          * And report an error for unexpected script URL.
  38          * @param {ASTNode} node node to check
  39          * @returns {void}
  40          */
  41         function check(node) {
  42             const value = astUtils.getStaticStringValue(node);
  43
  44             if (typeof value === "string" && value.toLowerCase().indexOf("javascript:") === 0) {
  45                 context.report({ node, messageId: "unexpectedScriptURL" });
  46             }
  47         }
  48         return {
  49             Literal(node) {
  50                 if (node.value && typeof node.value === "string") {
  51                     check(node);
  52                 }
  53             },
  54             TemplateLiteral(node) {
  55                 if (!(node.parent && node.parent.type === "TaggedTemplateExpression")) {
  56                     check(node);
  57                 }
  58             }
  59         };
  60     }
  61 };