JsonValidator

jsonvalidator.php

<?php
/**
 * Created by PhpStorm.
 * User: aonurdemir
 * Date: 31/10/2017
 * Time: 10:03
 */

class JsonValidator
{

    const BOOLEAN = "boolean";
    const INTEGER = "integer";
    const DOUBLE  = "double";
    const STRING  = "string";
    const ARRAY_ = "array";
    const OBJECT = "object";

    //TODO required check
    //TODO optional check
    public static function validateJson($json,$mappings){
        if(empty($mappings)){
            throw new Exception("mappings array is empty");
        }

        foreach ($mappings as $mapping_key=>$mapping_value){
            //base case
            if(gettype($mapping_value) !== self::ARRAY_){
                if(gettype($json[$mapping_key]) !== $mapping_value){
                    return false;
                }
            }
            //recursive part. Since it passes base case, json value corresponding to the mapping key should be an array.
            else{
                if(gettype($mapping_key) === self::INTEGER){//checks for array of objects. i.e "regions":[{},{}]
                    $result = true;
                    foreach ($json as $json_key=>$json_value){
                        $result = $result && self::validateJson($json_value,$mapping_value);
                    }
                    return $result;
                }
                else{
                    return self::validateJson($json[$mapping_key],$mapping_value);
                }
            }
        }
        return true;
    }
}

usage.php

$validator = array("setting"=>array(
                      "student_id"=>JsonValidator::INTEGER,
                      "regions"=>array(//this indicates that, regions is an array consisting of multiple objects
                                       //including below fields.
                          array(
                            "lat"=>JsonValidator::DOUBLE,
                            "lon"=>JsonValidator::DOUBLE,
                            "radius"=>JsonValidator::DOUBLE,
                            "gsm"=>JsonValidator::STRING,
                            "day_part"=>JsonValidator::STRING,
                            "is_pn_enabled"=>JsonValidator::BOOLEAN,
                            "is_sms_enabled"=>JsonValidator::BOOLEAN))));

$validated = JsonValidator::validateJson($setting,$validator);

validated_json.json

{
  "setting": {
		"student_id": 123,
    "regions": [
      {
        "lat": 11.0,
        "lon": 22.0,
        "radius": 1.0,
        "gsm": "5051230055",
        "day_part": "morning",
        "is_pn_enabled": true,
        "is_sms_enabled": true
      },
      {
        "lat": 33.0,
        "lon": 44.0,
        "radius": 5.0,
        "gsm": "5554443322",
        "day_part": "evening",
        "is_pn_enabled": false,
        "is_sms_enabled": false
      }
    ]
  }
}