feature(symfony): Add CSS Color Schema Restriction for Property Validation

src/Symfony/Bundle/Resources/config/metadata/validator.xml

@@ -22,6 +22,10 @@
             <tag name="api_platform.metadata.property_schema_restriction"/>
         </service>
 
+        <service id="api_platform.metadata.property_schema.css_color_restriction" class="ApiPlatform\Symfony\Validator\Metadata\Property\Restriction\PropertySchemaCssColorRestriction" public="false">
+            <tag name="api_platform.metadata.property_schema_restriction"/>
+        </service>
+
         <service id="api_platform.metadata.property_schema.greater_than_or_equal_restriction" class="ApiPlatform\Symfony\Validator\Metadata\Property\Restriction\PropertySchemaGreaterThanOrEqualRestriction" public="false">
             <tag name="api_platform.metadata.property_schema_restriction"/>
         </service>

src/Symfony/Validator/Metadata/Property/Restriction/PropertySchemaCssColorRestriction.php

@@ -0,0 +1,78 @@
+<?php
+
+/*
+ * This file is part of the API Platform project.
+ *
+ * (c) Kévin Dunglas <dunglas@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace ApiPlatform\Symfony\Validator\Metadata\Property\Restriction;
+
+use ApiPlatform\Metadata\ApiProperty;
+use Symfony\Component\Validator\Constraint;
+use Symfony\Component\Validator\Constraints\CssColor;
+
+/**
+ * Class PropertySchemaRegexRestriction.
+ */
+class PropertySchemaCssColorRestriction implements PropertySchemaRestrictionMetadataInterface
+{
+    private const PATTERN_HEX_LONG = '/^#[0-9a-f]{6}$/iD';
+    private const PATTERN_HEX_LONG_WITH_ALPHA = '/^#[0-9a-f]{8}$/iD';
+    private const PATTERN_HEX_SHORT = '/^#[0-9a-f]{3}$/iD';
+    private const PATTERN_HEX_SHORT_WITH_ALPHA = '/^#[0-9a-f]{4}$/iD';
+    // List comes from https://www.w3.org/wiki/CSS/Properties/color/keywords#Basic_Colors
+    private const PATTERN_BASIC_NAMED_COLORS = '/^(black|silver|gray|white|maroon|red|purple|fuchsia|green|lime|olive|yellow|navy|blue|teal|aqua)$/iD';
+    // List comes from https://www.w3.org/wiki/CSS/Properties/color/keywords#Extended_colors
+    private const PATTERN_EXTENDED_NAMED_COLORS = '/^(aliceblue|antiquewhite|aqua|aquamarine|azure|beige|bisque|black|blanchedalmond|blue|blueviolet|brown|burlywood|cadetblue|chartreuse|chocolate|coral|cornflowerblue|cornsilk|crimson|cyan|darkblue|darkcyan|darkgoldenrod|darkgray|darkgreen|darkgrey|darkkhaki|darkmagenta|darkolivegreen|darkorange|darkorchid|darkred|darksalmon|darkseagreen|darkslateblue|darkslategray|darkslategrey|darkturquoise|darkviolet|deeppink|deepskyblue|dimgray|dimgrey|dodgerblue|firebrick|floralwhite|forestgreen|fuchsia|gainsboro|ghostwhite|gold|goldenrod|gray|green|greenyellow|grey|honeydew|hotpink|indianred|indigo|ivory|khaki|lavender|lavenderblush|lawngreen|lemonchiffon|lightblue|lightcoral|lightcyan|lightgoldenrodyellow|lightgray|lightgreen|lightgrey|lightpink|lightsalmon|lightseagreen|lightskyblue|lightslategray|lightslategrey|lightsteelblue|lightyellow|lime|limegreen|linen|magenta|maroon|mediumaquamarine|mediumblue|mediumorchid|mediumpurple|mediumseagreen|mediumslateblue|mediumspringgreen|mediumturquoise|mediumvioletred|midnightblue|mintcream|mistyrose|moccasin|navajowhite|navy|oldlace|olive|olivedrab|orange|orangered|orchid|palegoldenrod|palegreen|paleturquoise|palevioletred|papayawhip|peachpuff|peru|pink|plum|powderblue|purple|red|rosybrown|royalblue|saddlebrown|salmon|sandybrown|seagreen|seashell|sienna|silver|skyblue|slateblue|slategray|slategrey|snow|springgreen|steelblue|tan|teal|thistle|tomato|turquoise|violet|wheat|white|whitesmoke|yellow|yellowgreen)$/iD';
+    // List comes from https://drafts.csswg.org/css-color/#css-system-colors
+    private const PATTERN_SYSTEM_COLORS = '/^(Canvas|CanvasText|LinkText|VisitedText|ActiveText|ButtonFace|ButtonText|ButtonBorder|Field|FieldText|Highlight|HighlightText|SelectedItem|SelectedItemText|Mark|MarkText|GrayText)$/iD';
+    private const PATTERN_KEYWORDS = '/^(transparent|currentColor)$/iD';
+    private const PATTERN_RGB = '/^rgb\(\s*(0|255|25[0-4]|2[0-4]\d|1\d\d|0?\d?\d),\s*(0|255|25[0-4]|2[0-4]\d|1\d\d|0?\d?\d),\s*(0|255|25[0-4]|2[0-4]\d|1\d\d|0?\d?\d)\s*\)$/iD';
+    private const PATTERN_RGBA = '/^rgba\(\s*(0|255|25[0-4]|2[0-4]\d|1\d\d|0?\d?\d),\s*(0|255|25[0-4]|2[0-4]\d|1\d\d|0?\d?\d),\s*(0|255|25[0-4]|2[0-4]\d|1\d\d|0?\d?\d),\s*(0|0?\.\d+|1(\.0)?)\s*\)$/iD';
+    private const PATTERN_HSL = '/^hsl\(\s*(0|360|35\d|3[0-4]\d|[12]\d\d|0?\d?\d),\s*(0|100|\d{1,2})%,\s*(0|100|\d{1,2})%\s*\)$/iD';
+    private const PATTERN_HSLA = '/^hsla\(\s*(0|360|35\d|3[0-4]\d|[12]\d\d|0?\d?\d),\s*(0|100|\d{1,2})%,\s*(0|100|\d{1,2})%,\s*(0|0?\.\d+|1(\.0)?)\s*\)$/iD';
+
+    private const COLOR_PATTERNS = [
+        CssColor::HEX_LONG => self::PATTERN_HEX_LONG,
+        CssColor::HEX_LONG_WITH_ALPHA => self::PATTERN_HEX_LONG_WITH_ALPHA,
+        CssColor::HEX_SHORT => self::PATTERN_HEX_SHORT,
+        CssColor::HEX_SHORT_WITH_ALPHA => self::PATTERN_HEX_SHORT_WITH_ALPHA,
+        CssColor::BASIC_NAMED_COLORS => self::PATTERN_BASIC_NAMED_COLORS,
+        CssColor::EXTENDED_NAMED_COLORS => self::PATTERN_EXTENDED_NAMED_COLORS,
+        CssColor::SYSTEM_COLORS => self::PATTERN_SYSTEM_COLORS,
+        CssColor::KEYWORDS => self::PATTERN_KEYWORDS,
+        CssColor::RGB => self::PATTERN_RGB,
+        CssColor::RGBA => self::PATTERN_RGBA,
+        CssColor::HSL => self::PATTERN_HSL,
+        CssColor::HSLA => self::PATTERN_HSLA,
+    ];
+
+    /**
+     * {@inheritdoc}
+     *
+     * @param CssColor $constraint
+     */
+    public function create(Constraint $constraint, ApiProperty $propertyMetadata): array
+    {
+        return [
+            'pattern' => '^('.implode('|', array_map(
+                fn ($format) => trim(self::COLOR_PATTERNS[$format], '/iD^$'),
+                (array) $constraint->formats
+            )).')$',
+        ];
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function supports(Constraint $constraint, ApiProperty $propertyMetadata): bool
+    {
+        return $constraint instanceof CssColor;
+    }
+}