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| 1 | <?php |
| 2 | |
| 3 | namespace Automattic\Jetpack\Schema; |
| 4 | |
| 5 | use Automattic\Jetpack\Schema\Modifiers\Modifier_Fallback; |
| 6 | use Automattic\Jetpack\Schema\Types\Type_Any; |
| 7 | use Automattic\Jetpack\Schema\Types\Type_Any_JSON; |
| 8 | use Automattic\Jetpack\Schema\Types\Type_Array; |
| 9 | use Automattic\Jetpack\Schema\Types\Type_Assoc_Array; |
| 10 | use Automattic\Jetpack\Schema\Types\Type_Boolean; |
| 11 | use Automattic\Jetpack\Schema\Types\Type_Enum; |
| 12 | use Automattic\Jetpack\Schema\Types\Type_Float; |
| 13 | use Automattic\Jetpack\Schema\Types\Type_Number; |
| 14 | use Automattic\Jetpack\Schema\Types\Type_String; |
| 15 | use Automattic\Jetpack\Schema\Types\Type_Void; |
| 16 | |
| 17 | /** |
| 18 | * The Schema class is a factory for creating and managing validation rules based on specific |
| 19 | * schema types. It is a central point for defining the structure of your data |
| 20 | * and ensuring that it conforms to the expected format. |
| 21 | * |
| 22 | * The class provides static methods for creating Schema instances with different data types, |
| 23 | * making it easy to build complex validation rules with a clean and readable syntax. |
| 24 | * |
| 25 | * The purpose of the Schema class is to provide a consistent way to parse structured data. |
| 26 | * |
| 27 | * Use this to ensure that your data adheres to the defined schema and avoid issues |
| 28 | * caused by incorrect data types or missing properties. |
| 29 | * |
| 30 | * How to use the Schema class: |
| 31 | * |
| 32 | * 1. Define your schema structure using the static methods provided by the Schema |
| 33 | * class, such as `as_string()`, `as_array()`, `as_boolean()`, `as_number()`, |
| 34 | * `as_float()`, and `enum()`. These methods return Schema instances |
| 35 | * for the respective data types. |
| 36 | * |
| 37 | * 2. Optionally, you can chain additional methods on the Schema instances |
| 38 | * to further customize the validation behavior. For example, you can use |
| 39 | * `fallback()` to specify a default value when the input data is invalid or |
| 40 | * `nullable()` to allow null values. |
| 41 | * |
| 42 | * 3. Parse your data using the Schema instances. Call the `parse()` method on the |
| 43 | * Schema instance, passing in the input data to be parsed. |
| 44 | * The method will return the parsed data or a default |
| 45 | * value (if specified) when the input data is invalid. |
| 46 | * |
| 47 | * Example: |
| 48 | * |
| 49 | * $my_schema = Schema::as_array( |
| 50 | * [ |
| 51 | * 'name' => Schema::as_string(), |
| 52 | * 'age' => Schema::as_number()->fallback(0), |
| 53 | * 'is_active' => Schema::as_boolean()->nullable(), |
| 54 | * 'tags' => Schema::as_array(Schema::as_string()) |
| 55 | * ] |
| 56 | * ); |
| 57 | * |
| 58 | * $input_data = [ |
| 59 | * 'name' => 'John Doe', |
| 60 | * 'age' => 30, |
| 61 | * 'is_active' => null, |
| 62 | * 'tags' => ['tag1', 'tag2'] |
| 63 | * ]; |
| 64 | * |
| 65 | * $parsed_data = $my_schema->parse($input_data); |
| 66 | */ |
| 67 | class Schema { |
| 68 | const PACKAGE_VERSION = '0.3.0'; |
| 69 | |
| 70 | public static function as_string() { |
| 71 | return new Schema_Parser( new Type_String() ); |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * @param Parser $parser - The parser to apply to each array item when $data is parsed. |
| 76 | * |
| 77 | * @return Schema_Parser |
| 78 | */ |
| 79 | public static function as_array( Parser $parser ) { |
| 80 | return new Schema_Parser( new Type_Array( $parser ) ); |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * @param array $assoc_parser_array - An associative array of ["key" => "Parser"] pairs |
| 85 | * |
| 86 | * @return Schema_Parser |
| 87 | */ |
| 88 | public static function as_assoc_array( $assoc_parser_array ) { |
| 89 | return new Schema_Parser( new Type_Assoc_Array( $assoc_parser_array ) ); |
| 90 | } |
| 91 | |
| 92 | public static function as_boolean() { |
| 93 | return new Schema_Parser( new Type_Boolean() ); |
| 94 | } |
| 95 | |
| 96 | public static function as_number() { |
| 97 | return new Schema_Parser( new Type_Number() ); |
| 98 | } |
| 99 | |
| 100 | public static function as_float() { |
| 101 | return new Schema_Parser( new Type_Float() ); |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * @param array $allowed_values - An array of values that are allowed for this enum. |
| 106 | * |
| 107 | * @return Schema_Parser |
| 108 | */ |
| 109 | public static function enum( $allowed_values ) { |
| 110 | return new Schema_Parser( new Type_Enum( $allowed_values ) ); |
| 111 | } |
| 112 | |
| 113 | public static function any_json_data() { |
| 114 | return new Schema_Parser( new Type_Any_JSON() ); |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * Mark a schema as void - it should have no data worth keeping, and |
| 119 | * will always parse to null. |
| 120 | */ |
| 121 | public static function as_void() { |
| 122 | return new Schema_Parser( new Type_Void() ); |
| 123 | } |
| 124 | |
| 125 | /** |
| 126 | * Use With Caution! This will not parse the data - it will simply return it as-is. |
| 127 | * This is useful for delivering read-only data that we don't need to parse server-side. |
| 128 | * |
| 129 | * @see Type_Any |
| 130 | */ |
| 131 | public static function as_unsafe_any() { |
| 132 | return new Schema_Parser( new Type_Any() ); |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * @var \Automattic\Jetpack\Schema\Parser $parser - The parser to apply to each array item when $data is parsed. |
| 137 | */ |
| 138 | public static function either( ...$parsers ) { |
| 139 | $or = new Modifier_Fallback(); |
| 140 | foreach ( $parsers as $parser ) { |
| 141 | $or->add_fallback_parser( $parser ); |
| 142 | } |
| 143 | return new Schema_Parser( $or ); |
| 144 | } |
| 145 | } |