AvroValidator.php

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<?php
class AvroValidator {
    public static function getErrors( AvroSchema $schema, $datum ) {
        switch ( $schema->type ) {
        case AvroSchema::NULL_TYPE:
            if ( !is_null( $datum ) ) {
                return self::wrongType( 'null', $datum );
            }
            return [];
        case AvroSchema::BOOLEAN_TYPE:
            if ( !is_bool( $datum ) ) {
                return self::wrongType( 'boolean', $datum );
            }
            return [];
        case AvroSchema::STRING_TYPE:
        case AvroSchema::BYTES_TYPE:
            if ( !is_string( $datum ) ) {
                return self::wrongType( 'string', $datum );
            }
            return [];
        case AvroSchema::INT_TYPE:
            if ( !is_int( $datum ) ) {
                return self::wrongType( 'integer', $datum );
            }
            if ( AvroSchema::INT_MIN_VALUE > $datum
                || $datum > AvroSchema::INT_MAX_VALUE
            ) {
                return self::outOfRange(
                    AvroSchema::INT_MIN_VALUE,
                    AvroSchema::INT_MAX_VALUE,
                    $datum
                );
            }
            return [];
        case AvroSchema::LONG_TYPE:
            if ( !is_int( $datum ) ) {
                return self::wrongType( 'integer', $datum );
            }
            if ( AvroSchema::LONG_MIN_VALUE > $datum
                || $datum > AvroSchema::LONG_MAX_VALUE
            ) {
                return self::outOfRange(
                    AvroSchema::LONG_MIN_VALUE,
                    AvroSchema::LONG_MAX_VALUE,
                    $datum
                );
            }
            return [];
        case AvroSchema::FLOAT_TYPE:
        case AvroSchema::DOUBLE_TYPE:
            if ( !is_float( $datum ) && !is_int( $datum ) ) {
                return self::wrongType( 'float or integer', $datum );
            }
            return [];
        case AvroSchema::ARRAY_SCHEMA:
            if ( !is_array( $datum ) ) {
                return self::wrongType( 'array', $datum );
            }
            $errors = [];
            foreach ( $datum as $d ) {
                $result = self::getErrors( $schema->items(), $d );
                if ( $result ) {
                    $errors[] = $result;
                }
            }
            return $errors;
        case AvroSchema::MAP_SCHEMA:
            if ( !is_array( $datum ) ) {
                return self::wrongType( 'array', $datum );
            }
            $errors = [];
            foreach ( $datum as $k => $v ) {
                if ( !is_string( $k ) ) {
                    $errors[] = self::wrongType( 'string key', $k );
                }
                $result = self::getErrors( $schema->values(), $v );
                if ( $result ) {
                    $errors[$k] = $result;
                }
            }
            return $errors;
        case AvroSchema::UNION_SCHEMA:
            $errors = [];
            foreach ( $schema->schemas() as $schema ) {
                $result = self::getErrors( $schema, $datum );
                if ( !$result ) {
                    return [];
                }
                $errors[] = $result;
            }
            if ( $errors ) {
                return [ "Expected any one of these to be true", $errors ];
            }
            return "No schemas provided to union";
        case AvroSchema::ENUM_SCHEMA:
            if ( !in_array( $datum, $schema->symbols() ) ) {
                $symbols = implode( ', ', $schema->symbols );
                return "Expected one of $symbols but recieved $datum";
            }
            return [];
        case AvroSchema::FIXED_SCHEMA:
            if ( !is_string( $datum ) ) {
                return self::wrongType( 'string', $datum );
            }
            $len = strlen( $datum );
            if ( $len !== $schema->size() ) {
                return "Expected string of length {$schema->size()}, "
                    . "but recieved one of length $len";
            }
            return [];
        case AvroSchema::RECORD_SCHEMA:
        case AvroSchema::ERROR_SCHEMA:
        case AvroSchema::REQUEST_SCHEMA:
            if ( !is_array( $datum ) ) {
                return self::wrongType( 'array', $datum );
            }
            $errors = [];
            foreach ( $schema->fields() as $field ) {
                $name = $field->name();
                if ( !array_key_exists( $name, $datum ) ) {
                    $errors[$name] = 'Missing expected field';
                    continue;
                }
                $result = self::getErrors( $field->type(), $datum[$name] );
                if ( $result ) {
                    $errors[$name] = $result;
                }
            }
            return $errors;
        default:
            return "Unknown avro schema type: {$schema->type}";
        }
    }
 
    public static function typeOf( $datum ) {
        return is_object( $datum ) ? get_class( $datum ) : gettype( $datum );
    }
 
    public static function wrongType( $expected, $datum ) {
        return "Expected $expected, but recieved " . self::typeOf( $datum );
    }
 
    public static function outOfRange( $min, $max, $datum ) {
        return "Expected value between $min and $max, but recieved $datum";
    }
}