From ab85fd6ff6a0f4b5b36bd61eadb1750a7f54d747 Mon Sep 17 00:00:00 2001
From: Douglas Wade <douglas.b.wade@gmail.com>
Date: Tue, 17 May 2022 03:48:40 -0700
Subject: [PATCH] Add `vue/no-invalid-attribute-name` rule (#1851)

* Fix #1373: Add rule no-invalid-attribute-name

* Remove stray newline

* Apply suggestions from code review

Co-authored-by: Flo Edelmann <florian-edelmann@online.de>

* #1373 Use xml-name-validator

* Fix linting error

* remove stray newline

* refactor test code

* Update lib/rules/no-invalid-attribute-name.js

Co-authored-by: Flo Edelmann <florian-edelmann@online.de>

* fix bad commit from github ui

* fix typechecking error

* Respond to PR feedback

* Include the added types in package.json

* check v-bind directives

* Update tests/lib/rules/no-invalid-attribute-name.js

Co-authored-by: Flo Edelmann <florian-edelmann@online.de>

* Fix failing unit test

* Update lib/rules/no-invalid-attribute-name.js

* Update lib/rules/no-invalid-attribute-name.js

* Update tests/lib/rules/no-invalid-attribute-name.js

* Update tests/lib/rules/no-invalid-attribute-name.js

Co-authored-by: Flo Edelmann <florian-edelmann@online.de>
Co-authored-by: Yosuke Ota <otameshiyo23@gmail.com>
---
 docs/rules/README.md                         |   1 +
 docs/rules/no-invalid-attribute-name.md      |  43 ++++++
 lib/index.js                                 |   1 +
 lib/rules/no-invalid-attribute-name.js       |  69 +++++++++
 package.json                                 |   4 +-
 tests/lib/rules/no-invalid-attribute-name.js | 146 +++++++++++++++++++
 6 files changed, 263 insertions(+), 1 deletion(-)
 create mode 100644 docs/rules/no-invalid-attribute-name.md
 create mode 100644 lib/rules/no-invalid-attribute-name.js
 create mode 100644 tests/lib/rules/no-invalid-attribute-name.js

diff --git a/docs/rules/README.md b/docs/rules/README.md
index 0f39db375..869a0cee0 100644
--- a/docs/rules/README.md
+++ b/docs/rules/README.md
@@ -224,6 +224,7 @@ For example:
 | [vue/no-boolean-default](./no-boolean-default.md) | disallow boolean defaults | :wrench: | :hammer: |
 | [vue/no-duplicate-attr-inheritance](./no-duplicate-attr-inheritance.md) | enforce `inheritAttrs` to be set to `false` when using `v-bind="$attrs"` |  | :hammer: |
 | [vue/no-empty-component-block](./no-empty-component-block.md) | disallow the `<template>` `<script>` `<style>` block to be empty |  | :hammer: |
+| [vue/no-invalid-attribute-name](./no-invalid-attribute-name.md) | require valid attribute names |  | :warning: |
 | [vue/no-multiple-objects-in-class](./no-multiple-objects-in-class.md) | disallow to pass multiple objects into array to class |  | :hammer: |
 | [vue/no-potential-component-option-typo](./no-potential-component-option-typo.md) | disallow a potential typo in your component property | :bulb: | :hammer: |
 | [vue/no-restricted-block](./no-restricted-block.md) | disallow specific block |  | :hammer: |
diff --git a/docs/rules/no-invalid-attribute-name.md b/docs/rules/no-invalid-attribute-name.md
new file mode 100644
index 000000000..811d92322
--- /dev/null
+++ b/docs/rules/no-invalid-attribute-name.md
@@ -0,0 +1,43 @@
+---
+pageClass: rule-details
+sidebarDepth: 0
+title: vue/no-invalid-attribute-name
+description: require valid attribute names
+---
+# vue/no-invalid-attribute-name
+
+> require valid attribute names
+
+- :exclamation: <badge text="This rule has not been released yet." vertical="middle" type="error"> ***This rule has not been released yet.*** </badge>
+
+## :book: Rule Details
+
+This rule detects invalid HTML attributes.
+
+<eslint-code-block :rules="{'vue/no-invalid-attribute-name': ['error']}">
+
+```vue
+<template>
+  <!-- ✓ GOOD -->
+  <p foo.bar></p>
+  <p foo-bar></p>
+  <p _foo.bar></p>
+  <p :foo-bar></p>
+
+  <!-- ✗ BAD -->
+  <p 0abc></p>
+  <p -def></p>
+  <p !ghi></p>
+</template>
+```
+
+</eslint-code-block>
+
+## :wrench: Options
+
+Nothing.
+
+## :mag: Implementation
+
+- [Rule source](https://github.com/vuejs/eslint-plugin-vue/blob/master/lib/rules/no-invalid-attribute-name.js)
+- [Test source](https://github.com/vuejs/eslint-plugin-vue/blob/master/tests/lib/rules/no-invalid-attribute-name.js)
diff --git a/lib/index.js b/lib/index.js
index b46d395d4..7d30f4e51 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -91,6 +91,7 @@ module.exports = {
     'no-export-in-script-setup': require('./rules/no-export-in-script-setup'),
     'no-expose-after-await': require('./rules/no-expose-after-await'),
     'no-extra-parens': require('./rules/no-extra-parens'),
+    'no-invalid-attribute-name': require('./rules/no-invalid-attribute-name'),
     'no-invalid-model-keys': require('./rules/no-invalid-model-keys'),
     'no-irregular-whitespace': require('./rules/no-irregular-whitespace'),
     'no-lifecycle-after-await': require('./rules/no-lifecycle-after-await'),
diff --git a/lib/rules/no-invalid-attribute-name.js b/lib/rules/no-invalid-attribute-name.js
new file mode 100644
index 000000000..8fd3c713a
--- /dev/null
+++ b/lib/rules/no-invalid-attribute-name.js
@@ -0,0 +1,69 @@
+/**
+ * @author Doug Wade <douglas.b.wade@gmail.com>
+ * See LICENSE file in root directory for full license.
+ */
+'use strict'
+
+const utils = require('../utils')
+const xnv = require('xml-name-validator')
+
+module.exports = {
+  meta: {
+    type: 'problem',
+    docs: {
+      description: 'require valid attribute names',
+      categories: undefined,
+      url: 'https://eslint.vuejs.org/rules/no-invalid-attribute-name.html'
+    },
+    fixable: null,
+    schema: [],
+    messages: {
+      attribute: 'Attribute name {{name}} is not valid.'
+    }
+  },
+  /** @param {RuleContext} context */
+  create(context) {
+    /**
+     * @param {string | VIdentifier} key
+     * @return {string}
+     */
+    const getName = (key) => (typeof key === 'string' ? key : key.name)
+
+    return utils.defineTemplateBodyVisitor(context, {
+      /** @param {VDirective | VAttribute} node */
+      VAttribute(node) {
+        if (utils.isCustomComponent(node.parent.parent)) {
+          return
+        }
+
+        const name = getName(node.key.name)
+
+        if (
+          node.directive &&
+          name === 'bind' &&
+          node.key.argument &&
+          node.key.argument.type === 'VIdentifier' &&
+          !xnv.name(node.key.argument.name)
+        ) {
+          context.report({
+            node,
+            messageId: 'attribute',
+            data: {
+              name: node.key.argument.name
+            }
+          })
+        }
+
+        if (!node.directive && !xnv.name(name)) {
+          context.report({
+            node,
+            messageId: 'attribute',
+            data: {
+              name
+            }
+          })
+        }
+      }
+    })
+  }
+}
diff --git a/package.json b/package.json
index 5a910309b..be8dac23f 100644
--- a/package.json
+++ b/package.json
@@ -59,7 +59,8 @@
     "nth-check": "^2.0.1",
     "postcss-selector-parser": "^6.0.9",
     "semver": "^7.3.5",
-    "vue-eslint-parser": "^9.0.1"
+    "vue-eslint-parser": "^9.0.1",
+    "xml-name-validator": "^4.0.0"
   },
   "devDependencies": {
     "@types/eslint": "^8.4.2",
@@ -67,6 +68,7 @@
     "@types/natural-compare": "^1.4.1",
     "@types/node": "^13.13.5",
     "@types/semver": "^7.3.9",
+    "@types/xml-name-validator": "^4.0.0",
     "@typescript-eslint/parser": "^5.23.0",
     "@vuepress/plugin-pwa": "^1.9.7",
     "acorn": "^8.7.1",
diff --git a/tests/lib/rules/no-invalid-attribute-name.js b/tests/lib/rules/no-invalid-attribute-name.js
new file mode 100644
index 000000000..09c07cc23
--- /dev/null
+++ b/tests/lib/rules/no-invalid-attribute-name.js
@@ -0,0 +1,146 @@
+/**
+ * @author *****your name*****
+ * See LICENSE file in root directory for full license.
+ */
+'use strict'
+
+const RuleTester = require('eslint').RuleTester
+const rule = require('../../../lib/rules/no-invalid-attribute-name')
+
+const tester = new RuleTester({
+  parser: require.resolve('vue-eslint-parser'),
+  parserOptions: {
+    ecmaVersion: 2020,
+    sourceType: 'module'
+  }
+})
+
+tester.run('no-invalid-attribute-name', rule, {
+  valid: [
+    {
+      filename: 'test.vue',
+      code: '<template><p foo /></template>'
+    },
+    {
+      filename: 'test.vue',
+      code: `<template><p foo="bar" /></template>`
+    },
+    {
+      filename: 'test.vue',
+      code: `<template><p foo-bar /></template>`
+    },
+    {
+      filename: 'test.vue',
+      code: `<template><p _foo-bar /></template>`
+    },
+    {
+      filename: 'test.vue',
+      code: `<template><p :foo-bar /></template>`
+    },
+    {
+      filename: 'test.vue',
+      code: `<template><p foo.bar /></template>`
+    },
+    {
+      filename: 'test.vue',
+      code: `<template><p quux-.9 /></template>`
+    },
+    {
+      filename: 'test.vue',
+      code: `<template><MyComponent 0abc="foo" /></template>`
+    },
+    {
+      filename: 'test.vue',
+      code: `<template><MyComponent :0abc="foo" /></template>`
+    },
+    {
+      filename: 'test.vue',
+      code: `<template><a :href="url"> ... </a></template>`
+    },
+    {
+      filename: 'test.vue',
+      code: `<template><div v-bind:class="{ active: isActive }"></div></template>`
+    },
+    {
+      filename: 'test.vue',
+      code: `<template><p v-if="seen">Now you see me</p></template>`
+    },
+    {
+      filename: 'test.vue',
+      code: `<a v-on:[eventName]="doSomething"> ... </a>`
+    },
+    {
+      filename: 'test.vue',
+      code: `<form v-on:submit.prevent="onSubmit"> ... </form>`
+    },
+    {
+      filename: 'test.vue',
+      code: `<a @[event]="doSomething"> ... </a>`
+    },
+    {
+      filename: 'test.vue',
+      code: `<template><div v-bind="..."></div></template>`
+    },
+    {
+      filename: 'test.vue',
+      code: `<template><div v-0abc="..."></div></template>`
+    }
+  ],
+  invalid: [
+    {
+      filename: 'test.vue',
+      code: `<template><p 0abc /></template>`,
+      errors: [
+        {
+          message: 'Attribute name 0abc is not valid.',
+          line: 1,
+          column: 14
+        }
+      ]
+    },
+    {
+      filename: 'test.vue',
+      code: `<template><p -def></template>`,
+      errors: [
+        {
+          message: 'Attribute name -def is not valid.',
+          line: 1,
+          column: 14
+        }
+      ]
+    },
+    {
+      filename: 'test.vue',
+      code: `<template><p !ghi /></template>`,
+      errors: [
+        {
+          message: 'Attribute name !ghi is not valid.',
+          line: 1,
+          column: 14
+        }
+      ]
+    },
+    {
+      filename: 'test.vue',
+      code: `<template><p v-bind:0abc=""></template>`,
+      errors: [
+        {
+          message: 'Attribute name 0abc is not valid.',
+          line: 1,
+          column: 14
+        }
+      ]
+    },
+    {
+      filename: 'test.vue',
+      code: `<template><p :0abc="..." /></template>`,
+      errors: [
+        {
+          message: 'Attribute name 0abc is not valid.',
+          line: 1,
+          column: 14
+        }
+      ]
+    }
+  ]
+})