Add core extensions: UserCSS, UserJS (#6267)

* Copy CustomCSS and CustomJS

Original: FreshRSS/Extensions@9f21984

* Rename CustomCSS -> UserCSS

* Rename CustomJS -> UserJS

* Change metadata

The name is used for the directory where the configuration
is stored and should not contain spaces.
Since the name was changed, I reset the version number and
changed to semantic versioning.

* Change data directory

Changed the location of the configuration file to
the user data directory, because it is not `static`.
That way, the user's configurations are gathered
in the user directory, which makes it easier to backup them.

* Edit documentations

Remove procedures to install the extension
because it is no longer necessary.

* Fix wrong variables in the configuration page

Remove permission error indication because the storage location
is now in the user data directory managed by the application.

* Remove the `xExtension-` prefix for core extensions

* Set version to 1.0.0 for UserCSS, UserJS

* Refactoring

* Remove unused variables

* Remove version 0.0.1 in Changelog

Version 0.0.1 will not be merged, so only version 1.0.0 will remain.

* public getFileUrl

* Revert more protected

* Use entrypoint for extension user path instead of name

* Add space to extension name

* Add `#[\Override]`

* Add explains of User CSS and User JS to docs

* Remove README of User CSS and User JS

* Add migration code for extension user path

---------

Co-authored-by: Alexandre Alapetite <alexandre@alapetite.fr>

15 files changed, 228 insertions, 24 deletions

diff --git a/lib/Minz/Extension.php b/lib/Minz/Extension.php
index 15fae77a6..0069e21cb 100644
--- a/lib/Minz/Extension.php
+++ b/lib/Minz/Extension.php
@@ -80,7 +80,9 @@ abstract class Minz_Extension {
 	 * enabled by the extension manager).
 	 * @return void
 	 */
-	abstract public function init();
+	public function init() {
+		$this->migrateExtensionUserPath();
+	}
 
 	/**
 	 * Set the current extension to enable.
@@ -118,7 +120,9 @@ abstract class Minz_Extension {
 	 * Handle the configure action.
 	 * @return void
 	 */
-	public function handleConfigureAction() {}
+	public function handleConfigureAction() {
+		$this->migrateExtensionUserPath();
+	}
 
 	/**
 	 * Getters and setters.
@@ -154,6 +158,32 @@ abstract class Minz_Extension {
 		$this->type = $type;
 	}
 
+	/** Return the user-specific, extension-specific, folder where this extension can save user-specific data */
+	protected final function getExtensionUserPath(): string {
+		$username = Minz_User::name() ?: '_';
+		return USERS_PATH . "/{$username}/extensions/{$this->getEntrypoint()}";
+	}
+
+	private function migrateExtensionUserPath(): void {
+		$username = Minz_User::name() ?: '_';
+		$old_extension_user_path = USERS_PATH . "/{$username}/extensions/{$this->getName()}";
+		$new_extension_user_path = $this->getExtensionUserPath();
+		if (is_dir($old_extension_user_path)) {
+			rename($old_extension_user_path, $new_extension_user_path);
+		}
+	}
+
+	/** Return whether a user-specific, extension-specific, file exists */
+	protected final function hasFile(string $filename): bool {
+		return file_exists($this->getExtensionUserPath() . '/' . $filename);
+	}
+
+	/** Return the user-specific, extension-specific, file content, or null if it does not exist */
+	protected final function getFile(string $filename): ?string {
+		$content = @file_get_contents($this->getExtensionUserPath() . '/' . $filename);
+		return is_string($content) ? $content : null;
+	}
+
 	/**
 	 * Return the url for a given file.
 	 *
@@ -172,8 +202,8 @@ abstract class Minz_Extension {
 			if ($username == null) {
 				return '';
 			}
-			$path = USERS_PATH . "/{$username}/extensions/{$this->getName()}/{$filename}";
-			$file_name_url = urlencode("{$username}/extensions/{$this->getName()}/{$filename}");
+			$path = $this->getExtensionUserPath() . "/{$filename}";
+			$file_name_url = urlencode("{$username}/extensions/{$this->getEntrypoint()}/{$filename}");
 			$mtime = @filemtime($path);
 		}
 
@@ -185,21 +215,21 @@ abstract class Minz_Extension {
 	 *
 	 * @param string $base_name the base name of the controller. Final name will be FreshExtension_<base_name>_Controller.
 	 */
-	public final function registerController(string $base_name): void {
+	protected final function registerController(string $base_name): void {
 		Minz_Dispatcher::registerController($base_name, $this->path);
 	}
 
 	/**
 	 * Register the views in order to be accessible by the application.
 	 */
-	public final function registerViews(): void {
+	protected final function registerViews(): void {
 		Minz_View::addBasePathname($this->path);
 	}
 
 	/**
 	 * Register i18n files from ext_dir/i18n/
 	 */
-	public final function registerTranslates(): void {
+	protected final function registerTranslates(): void {
 		$i18n_dir = $this->path . '/i18n';
 		Minz_Translate::registerPath($i18n_dir);
 	}
@@ -210,7 +240,7 @@ abstract class Minz_Extension {
 	 * @param string $hook_name the hook name (must exist).
 	 * @param callable $hook_function the function name to call (must be callable).
 	 */
-	public final function registerHook(string $hook_name, $hook_function): void {
+	protected final function registerHook(string $hook_name, $hook_function): void {
 		Minz_ExtensionManager::addHook($hook_name, $hook_function);
 	}
 
@@ -249,7 +279,7 @@ abstract class Minz_Extension {
 	/**
 	 * @return array<string,mixed>
 	 */
-	public final function getSystemConfiguration(): array {
+	protected final function getSystemConfiguration(): array {
 		if ($this->isConfigurationEnabled('system') && $this->isExtensionConfigured('system')) {
 			return FreshRSS_Context::systemConf()->extensions[$this->getName()];
 		}
@@ -259,7 +289,7 @@ abstract class Minz_Extension {
 	/**
 	 * @return array<string,mixed>
 	 */
-	public final function getUserConfiguration(): array {
+	protected final function getUserConfiguration(): array {
 		if ($this->isConfigurationEnabled('user') && $this->isExtensionConfigured('user')) {
 			return FreshRSS_Context::userConf()->extensions[$this->getName()];
 		}
@@ -324,13 +354,13 @@ abstract class Minz_Extension {
 	}
 
 	/** @param array<string,mixed> $configuration */
-	public final function setSystemConfiguration(array $configuration): void {
+	protected final function setSystemConfiguration(array $configuration): void {
 		$this->setConfiguration('system', $configuration);
 		$this->system_configuration = $configuration;
 	}
 
 	/** @param array<string,mixed> $configuration */
-	public final function setUserConfiguration(array $configuration): void {
+	protected final function setUserConfiguration(array $configuration): void {
 		$this->setConfiguration('user', $configuration);
 		$this->user_configuration = $configuration;
 	}
@@ -361,19 +391,18 @@ abstract class Minz_Extension {
 		$conf->save();
 	}
 
-	public final function removeSystemConfiguration(): void {
+	protected final function removeSystemConfiguration(): void {
 		$this->removeConfiguration('system');
 		$this->system_configuration = null;
 	}
 
-	public final function removeUserConfiguration(): void {
+	protected final function removeUserConfiguration(): void {
 		$this->removeConfiguration('user');
 		$this->user_configuration = null;
 	}
 
-	public final function saveFile(string $filename, string $content): void {
-		$username = Minz_User::name();
-		$path = USERS_PATH . "/{$username}/extensions/{$this->getName()}";
+	protected final function saveFile(string $filename, string $content): void {
+		$path = $this->getExtensionUserPath();
 
 		if (!file_exists($path)) {
 			mkdir($path, 0777, true);
@@ -382,13 +411,8 @@ abstract class Minz_Extension {
 		file_put_contents("{$path}/{$filename}", $content);
 	}
 
-	public final function removeFile(string $filename): void {
-		$username = Minz_User::name();
-		if ($username == null) {
-			return;
-		}
-		$path = USERS_PATH . "/{$username}/extensions/{$this->getName()}/{$filename}";
-
+	protected final function removeFile(string $filename): void {
+		$path = $path = $this->getExtensionUserPath() . '/' . $filename;
 		if (file_exists($path)) {
 			unlink($path);
 		}
diff --git a/lib/core-extensions/UserCSS/configure.phtml b/lib/core-extensions/UserCSS/configure.phtml
new file mode 100644
index 000000000..22d4ea79a
--- /dev/null
+++ b/lib/core-extensions/UserCSS/configure.phtml
@@ -0,0 +1,20 @@
+<?php
+	declare(strict_types=1);
+	/** @var UserCSSExtension $this */
+?>
+<form action="<?= _url('extension', 'configure', 'e', urlencode($this->getName())); ?>" method="post">
+	<input type="hidden" name="_csrf" value="<?= FreshRSS_Auth::csrfToken() ?>" />
+	<div class="form-group">
+		<label class="group-name" for="css-rules"><?= _t('ext.user_css.write_css') ?></label>
+		<div class="group-controls">
+			<textarea name="css-rules" id="css-rules"><?= $this->css_rules ?></textarea>
+		</div>
+	</div>
+
+	<div class="form-group form-actions">
+		<div class="group-controls">
+			<button type="submit" class="btn btn-important"><?= _t('gen.action.submit') ?></button>
+			<button type="reset" class="btn"><?= _t('gen.action.cancel') ?></button>
+		</div>
+	</div>
+</form>
diff --git a/lib/core-extensions/UserCSS/extension.php b/lib/core-extensions/UserCSS/extension.php
new file mode 100644
index 000000000..5343fd39a
--- /dev/null
+++ b/lib/core-extensions/UserCSS/extension.php
@@ -0,0 +1,34 @@
+<?php
+declare(strict_types=1);
+
+final class UserCSSExtension extends Minz_Extension {
+	public string $css_rules = '';
+	private const FILENAME = 'style.css';
+
+	#[\Override]
+	public function init(): void {
+		parent::init();
+
+		$this->registerTranslates();
+		if ($this->hasFile(self::FILENAME)) {
+			Minz_View::appendStyle($this->getFileUrl(self::FILENAME, 'css', false));
+		}
+	}
+
+	#[\Override]
+	public function handleConfigureAction(): void {
+		parent::init();
+
+		$this->registerTranslates();
+
+		if (Minz_Request::isPost()) {
+			$css_rules = html_entity_decode(Minz_Request::paramString('css-rules'));
+			$this->saveFile(self::FILENAME, $css_rules);
+		}
+
+		$this->css_rules = '';
+		if ($this->hasFile(self::FILENAME)) {
+			$this->css_rules = htmlentities($this->getFile(self::FILENAME) ?? '');
+		}
+	}
+}
diff --git a/lib/core-extensions/UserCSS/i18n/de/ext.php b/lib/core-extensions/UserCSS/i18n/de/ext.php
new file mode 100644
index 000000000..cafc5f2f0
--- /dev/null
+++ b/lib/core-extensions/UserCSS/i18n/de/ext.php
@@ -0,0 +1,7 @@
+<?php
+
+return array(
+	'user_css' => array(
+		'write_css' => 'Benutzerspezifische CSS Regeln',
+	),
+);
diff --git a/lib/core-extensions/UserCSS/i18n/en/ext.php b/lib/core-extensions/UserCSS/i18n/en/ext.php
new file mode 100644
index 000000000..b82cd8331
--- /dev/null
+++ b/lib/core-extensions/UserCSS/i18n/en/ext.php
@@ -0,0 +1,7 @@
+<?php
+
+return array(
+	'user_css' => array(
+		'write_css' => 'Additional CSS rules',
+	),
+);
diff --git a/lib/core-extensions/UserCSS/i18n/fr/ext.php b/lib/core-extensions/UserCSS/i18n/fr/ext.php
new file mode 100644
index 000000000..507d8be45
--- /dev/null
+++ b/lib/core-extensions/UserCSS/i18n/fr/ext.php
@@ -0,0 +1,7 @@
+<?php
+
+return array(
+	'user_css' => array(
+		'write_css' => 'Règles CSS supplémentaires',
+	),
+);
diff --git a/lib/core-extensions/UserCSS/i18n/ja/ext.php b/lib/core-extensions/UserCSS/i18n/ja/ext.php
new file mode 100644
index 000000000..ce8d17c78
--- /dev/null
+++ b/lib/core-extensions/UserCSS/i18n/ja/ext.php
@@ -0,0 +1,7 @@
+<?php
+
+return array(
+	'user_css' => array(
+		'write_css' => '追加のCSSルール',
+	),
+);
diff --git a/lib/core-extensions/UserCSS/metadata.json b/lib/core-extensions/UserCSS/metadata.json
new file mode 100644
index 000000000..2de79af8c
--- /dev/null
+++ b/lib/core-extensions/UserCSS/metadata.json
@@ -0,0 +1,8 @@
+{
+	"name": "User CSS",
+	"author": "hkcomori, Marien Fressinaud",
+	"description": "Give possibility to overwrite the CSS with a user-specific rules.",
+	"version": "1.0.0",
+	"entrypoint": "UserCSS",
+	"type": "user"
+}
diff --git a/lib/core-extensions/UserJS/configure.phtml b/lib/core-extensions/UserJS/configure.phtml
new file mode 100644
index 000000000..88172679d
--- /dev/null
+++ b/lib/core-extensions/UserJS/configure.phtml
@@ -0,0 +1,20 @@
+<?php
+	declare(strict_types=1);
+	/** @var UserJSExtension $this */
+?>
+<form action="<?= _url('extension', 'configure', 'e', urlencode($this->getName())) ?>" method="post">
+	<input type="hidden" name="_csrf" value="<?= FreshRSS_Auth::csrfToken() ?>" />
+	<div class="form-group">
+		<label class="group-name" for="js-rules"><?= _t('ext.user_js.write_js') ?></label>
+		<div class="group-controls">
+			<textarea name="js-rules" id="js-rules"><?= $this->js_rules ?></textarea>
+		</div>
+	</div>
+
+	<div class="form-group form-actions">
+		<div class="group-controls">
+			<button type="submit" class="btn btn-important"><?= _t('gen.action.submit') ?></button>
+			<button type="reset" class="btn"><?= _t('gen.action.cancel') ?></button>
+		</div>
+	</div>
+</form>
diff --git a/lib/core-extensions/UserJS/extension.php b/lib/core-extensions/UserJS/extension.php
new file mode 100644
index 000000000..a33114ec5
--- /dev/null
+++ b/lib/core-extensions/UserJS/extension.php
@@ -0,0 +1,34 @@
+<?php
+declare(strict_types=1);
+
+final class UserJSExtension extends Minz_Extension {
+	public string $js_rules = '';
+	private const FILENAME = 'script.js';
+
+	#[\Override]
+	public function init(): void {
+		parent::init();
+
+		$this->registerTranslates();
+		if ($this->hasFile(self::FILENAME)) {
+			Minz_View::appendScript($this->getFileUrl(self::FILENAME, 'js', false));
+		}
+	}
+
+	#[\Override]
+	public function handleConfigureAction(): void {
+		parent::init();
+
+		$this->registerTranslates();
+
+		if (Minz_Request::isPost()) {
+			$js_rules = html_entity_decode(Minz_Request::paramString('js-rules'));
+			$this->saveFile(self::FILENAME, $js_rules);
+		}
+
+		$this->js_rules = '';
+		if ($this->hasFile(self::FILENAME)) {
+			$this->js_rules = htmlentities($this->getFile(self::FILENAME) ?? '');
+		}
+	}
+}
diff --git a/lib/core-extensions/UserJS/i18n/de/ext.php b/lib/core-extensions/UserJS/i18n/de/ext.php
new file mode 100644
index 000000000..be57c7553
--- /dev/null
+++ b/lib/core-extensions/UserJS/i18n/de/ext.php
@@ -0,0 +1,7 @@
+<?php
+
+return array(
+	'user_js' => array(
+		'write_js' => 'Benutzerspezifische Javascript Regeln',
+	),
+);
diff --git a/lib/core-extensions/UserJS/i18n/en/ext.php b/lib/core-extensions/UserJS/i18n/en/ext.php
new file mode 100644
index 000000000..1217a46fa
--- /dev/null
+++ b/lib/core-extensions/UserJS/i18n/en/ext.php
@@ -0,0 +1,7 @@
+<?php
+
+return array(
+	'user_js' => array(
+		'write_js' => 'Additional JS',
+	),
+);
diff --git a/lib/core-extensions/UserJS/i18n/fr/ext.php b/lib/core-extensions/UserJS/i18n/fr/ext.php
new file mode 100644
index 000000000..c12e919d0
--- /dev/null
+++ b/lib/core-extensions/UserJS/i18n/fr/ext.php
@@ -0,0 +1,7 @@
+<?php
+
+return array(
+	'user_js' => array(
+		'write_js' => 'JS supplémentaires',
+	),
+);
diff --git a/lib/core-extensions/UserJS/i18n/ja/ext.php b/lib/core-extensions/UserJS/i18n/ja/ext.php
new file mode 100644
index 000000000..390ff6a2f
--- /dev/null
+++ b/lib/core-extensions/UserJS/i18n/ja/ext.php
@@ -0,0 +1,7 @@
+<?php
+
+return array(
+	'user_js' => array(
+		'write_js' => '追加のJS',
+	),
+);
diff --git a/lib/core-extensions/UserJS/metadata.json b/lib/core-extensions/UserJS/metadata.json
new file mode 100644
index 000000000..d38958801
--- /dev/null
+++ b/lib/core-extensions/UserJS/metadata.json
@@ -0,0 +1,8 @@
+{
+	"name": "User JS",
+	"author": "hkcomori, Frans de Jonge",
+	"description": "Apply user JS.",
+	"version": "1.0.0",
+	"entrypoint": "UserJS",
+	"type": "user"
+}