First commit

.editorconfig

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+root = true
+[*]
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+indent_style = space
+indent_size = 4
+[*.md]
+indent_size = 2
+trim_trailing_whitespace = false

.gitattributes

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+.gitattributes export-ignore
+.github export-ignore
+.gitignore export-ignore
+.gitmodules export-ignore
+js/*/src export-ignore
+js/*/Gulfile.js
+js/*/package.json
+js/*/yarn.lock
+
+js/*/dist/*.js -diff

.gitignore

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+js/*/node_modules
+vendor/
+composer.lock

LICENSE.md

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+The MIT License (MIT)
+
+Copyright (c) Flagrow
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Custom HTML Error Pages by ![Flagrow logo](https://avatars0.githubusercontent.com/u/16413865?v=3&s=20) [Flagrow](https://discuss.flarum.org/d/1832-flagrow-extension-developer-group), a project of [Gravure](https://gravure.io/)
+
+[![MIT license](https://img.shields.io/badge/license-MIT-blue.svg)](https://github.com/flagrow/html-errors/blob/master/LICENSE.md) [![Latest Stable Version](https://img.shields.io/packagist/v/flagrow/html-errors.svg)](https://packagist.org/packages/flagrow/html-errors) [![Total Downloads](https://img.shields.io/packagist/dt/flagrow/html-errors.svg)](https://packagist.org/packages/flagrow/html-errors) [![Donate](https://img.shields.io/badge/patreon-support-yellow.svg)](https://www.patreon.com/flagrow) [![Join our Discord server](https://discordapp.com/api/guilds/240489109041315840/embed.png)](https://flagrow.io/join-discord)
+
+This extension allows you to customize the Flarum error pages.
+By default these pages have very boring HTML content with no styling and no link in beta7.
+Now you can change them to something that better reflects your website!
+
+## Installation
+
+Use [Bazaar](https://discuss.flarum.org/d/5151-flagrow-bazaar-the-extension-marketplace) or install manually:
+
+```bash
+composer require flagrow/html-errors
+```
+
+## Updating
+
+```bash
+composer update flagrow/html-errors
+php flarum migrate
+php flarum cache:clear
+```
+
+## Configuration
+
+Open the extension options to configure the custom HTML.
+Leaving a field empty will show the default Flarum error page.
+
+The custom error pages are only applied when browsing the forum front-end.
+Any error response under /api or /admin is unaffected.
+
+You can handle additional error codes by entering the values manually in the `settings` table of the database.
+
+## Support our work
+
+We prefer to keep our work available to everyone.
+In order to do so we rely on voluntary contributions on [Patreon](https://www.patreon.com/flagrow).
+
+## Security
+
+If you discover a security vulnerability within Custom HTML Error Pages, please send an email to the Gravure team at [email protected]. All security vulnerabilities will be promptly addressed.
+
+Please include as many details as possible. You can use `php flarum info` to get the PHP, Flarum and extension versions installed.
+
+## Links
+
+- [Flarum Discuss post](https://discuss.flarum.org/d/10784-custom-html-error-pages)
+- [Source code on GitHub](https://github.com/flagrow/html-errors)
+- [Report an issue](https://github.com/flagrow/html-errors/issues)
+- [Download via Packagist](https://packagist.org/packages/flagrow/html-errors)
+
+An extension by [Flagrow](https://flagrow.io/), a project of [Gravure](https://gravure.io/).

bootstrap.php

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+<?php
+
+namespace Flagrow\HtmlErrors;
+
+use Illuminate\Contracts\Events\Dispatcher;
+
+return function (Dispatcher $events) {
+    $events->subscribe(Listeners\Assets::class);
+    $events->subscribe(Listeners\Middlewares::class);
+};

composer.json

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+{
+    "name": "flagrow/html-errors",
+    "description": "Add custom HTML error pages",
+    "keywords": [
+        "extension",
+        "flarum",
+        "error",
+        "page",
+        "html"
+    ],
+    "type": "flarum-extension",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Clark Winkelmann",
+            "email": "[email protected]",
+            "homepage": "https://clarkwinkelmann.com/"
+        }
+    ],
+    "support": {
+        "issues": "https://github.com/flagrow/html-errors/issues",
+        "source": "https://github.com/flagrow/html-errors"
+    },
+    "require": {
+        "flarum/core": "^0.1.0-beta.7"
+    },
+    "extra": {
+        "flarum-extension": {
+            "title": "Flagrow HTML Errors",
+            "icon": {
+                "name": "exclamation-circle",
+                "backgroundColor": "#f4f4f4",
+                "color": "#5f4bb6"
+            }
+        },
+        "flagrow": {
+            "discuss": "https://discuss.flarum.org/d/10784-custom-html-error-pages"
+        }
+    },
+    "autoload": {
+        "psr-4": {
+            "Flagrow\\HtmlErrors\\": "src/"
+        }
+    }
+}

js/admin/Gulpfile.js

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+const gulp = require('flarum-gulp');
+
+gulp({
+    modules: {
+        'flagrow/html-errors': 'src/**/*.js'
+    }
+});

js/admin/dist/extension.js

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+'use strict';
+
+System.register('flagrow/html-errors/components/ErrorSettingsModal', ['flarum/app', 'flarum/components/SettingsModal'], function (_export, _context) {
+    "use strict";
+
+    var app, SettingsModal, settingsPrefix, translationPrefix, ErrorSettingsModal;
+    return {
+        setters: [function (_flarumApp) {
+            app = _flarumApp.default;
+        }, function (_flarumComponentsSettingsModal) {
+            SettingsModal = _flarumComponentsSettingsModal.default;
+        }],
+        execute: function () {
+            settingsPrefix = 'flagrow-html-errors.';
+            translationPrefix = 'flagrow-html-errors.admin.settings.';
+
+            ErrorSettingsModal = function (_SettingsModal) {
+                babelHelpers.inherits(ErrorSettingsModal, _SettingsModal);
+
+                function ErrorSettingsModal() {
+                    babelHelpers.classCallCheck(this, ErrorSettingsModal);
+                    return babelHelpers.possibleConstructorReturn(this, (ErrorSettingsModal.__proto__ || Object.getPrototypeOf(ErrorSettingsModal)).apply(this, arguments));
+                }
+
+                babelHelpers.createClass(ErrorSettingsModal, [{
+                    key: 'title',
+                    value: function title() {
+                        return app.translator.trans(translationPrefix + 'title');
+                    }
+                }, {
+                    key: 'className',
+                    value: function className() {
+                        return 'Modal--large';
+                    }
+                }, {
+                    key: 'form',
+                    value: function form() {
+                        var _this2 = this;
+
+                        return [403, 404, 500, 503].map(function (error) {
+                            return m('.Form-group', [m('label', app.translator.trans(translationPrefix + 'error.' + error)), m('textarea.FormControl', {
+                                bidi: _this2.setting(settingsPrefix + 'custom' + error + 'ErrorHtml'),
+                                placeholder: app.translator.trans(translationPrefix + 'placeholder.empty_for_default')
+                            })]);
+                        });
+                    }
+                }]);
+                return ErrorSettingsModal;
+            }(SettingsModal);
+
+            _export('default', ErrorSettingsModal);
+        }
+    };
+});;
+'use strict';
+
+System.register('flagrow/html-errors/main', ['flarum/extend', 'flarum/app', 'flagrow/html-errors/components/ErrorSettingsModal'], function (_export, _context) {
+    "use strict";
+
+    var extend, app, ErrorSettingsModal;
+    return {
+        setters: [function (_flarumExtend) {
+            extend = _flarumExtend.extend;
+        }, function (_flarumApp) {
+            app = _flarumApp.default;
+        }, function (_flagrowHtmlErrorsComponentsErrorSettingsModal) {
+            ErrorSettingsModal = _flagrowHtmlErrorsComponentsErrorSettingsModal.default;
+        }],
+        execute: function () {
+
+            app.initializers.add('flagrow-html-errors', function (app) {
+                app.extensionSettings['flagrow-html-errors'] = function () {
+                    return app.modal.show(new ErrorSettingsModal());
+                };
+            });
+        }
+    };
+});

js/admin/package.json

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+{
+    "private": true,
+    "devDependencies": {
+        "gulp": "^3.8.11",
+        "flarum-gulp": "^0.2.0"
+    }
+}

js/admin/src/components/ErrorSettingsModal.js

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+import app from 'flarum/app';
+import SettingsModal from 'flarum/components/SettingsModal';
+
+const settingsPrefix = 'flagrow-html-errors.';
+const translationPrefix = 'flagrow-html-errors.admin.settings.';
+
+export default class ErrorSettingsModal extends SettingsModal {
+    title() {
+        return app.translator.trans(translationPrefix + 'title');
+    }
+
+    className() {
+        return 'Modal--large';
+    }
+
+    form() {
+        return [403, 404, 500, 503].map(
+            error => m('.Form-group', [
+                m('label', app.translator.trans(translationPrefix + 'error.' + error)),
+                m('textarea.FormControl', {
+                    bidi: this.setting(settingsPrefix + 'custom' + error + 'ErrorHtml'),
+                    placeholder: app.translator.trans(translationPrefix + 'placeholder.empty_for_default'),
+                }),
+            ])
+        );
+    }
+}

js/admin/src/main.js

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+import {extend} from 'flarum/extend';
+import app from 'flarum/app';
+import ErrorSettingsModal from 'flagrow/html-errors/components/ErrorSettingsModal';
+
+app.initializers.add('flagrow-html-errors', app => {
+    app.extensionSettings['flagrow-html-errors'] = () => app.modal.show(new ErrorSettingsModal());
+});