7 files changed, 90 insertions, 0 deletions
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"
+}