Google geolocation using cell tower info- Curl 400 Bad request PHP - php

Question

I'm trying to get latitude and longitude from cell tower info using Google's geolocation api.
It requires a valid JSON with information like MCC, MNC, cellId, lac etc.., My PHP post request looks like this.
<?php
header("Access-Control-Allow-Origin: *");
$mcc = $_POST["mcc"];
$mnc = $_POST["mnc"];
$cellId = $_POST["cellId"];
$lac = $_POST["lac"];
$post_array = array(
"cellId" => (int) $cellId,
"locationAreaCode" => (int) $lac,
"mobileCountryCode" => (int) $mcc,
"mobileNetworkCode" => (int) $mnc,
);
$post_data = json_encode(array('cellTowers' => array($post_array)));
echo $post_data;
$url = "https://www.googleapis.com/geolocation/v1/geolocate?key=".$api_key; // not including api key here but its there in my code
$ch = curl_init();
curl_setopt_array($ch, array(
CURLOPT_URL => $url,
CURLOPT_POST => true,
CURLOPT_HEADER => false,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_SSL_VERIFYPEER => false,
CURLOPT_SSL_VERIFYHOST => 2,
CURLOPT_HTTPHEADER => array(
'Content-Type: application/json'
),
CURLOPT_POSTFIELDS => $post_data
));
$result = curl_exec($ch);
echo "Result: ".$result;
curl_close($ch);
?>
However I get an error saying bad request in the response. The error is shown below.
Result: {
"error": {
"errors": [
{
"domain": "geolocation",
"reason": "invalidRequest",
"message": "Bad Request"
}
],
"code": 400,
"message": "Bad Request"
}
}
I thought my JSON was not in the correct format but it was working with the following command line execution, so that can't be the issue.
$ curl -d #your_filename.json -H "Content-Type: application/json" -i "https://www.googleapis.com/geolocation/v1/geolocate?key=API_KEY"
The above command in terminal gives lattitude and longitude properly with the same JSON in a file. What am I doing wrong ?

Answer 1

Try this
$DadosLBS['homeMobileCountryCode'] = $data['MCC'];
$DadosLBS['homeMobileNetworkCode'] = $data['MNC'];
$DadosLBS['radioType'] = 'gsm';
$DadosLBS['carrier'] = $data['MNCOperator'];
$DadosLBS['cellTowers'] = [
[
'mobileCountryCode' => $data['MCC'],
'mobileNetworkCode' => $data['MNC'],
'age' => $data['Age'],
'timingAdvance' => $data['TA'],
'locationAreaCode' => $data['LAC'],
'cellId' => $data['CELL_ID'],
'signalStrength' => $data['SIGNAL'],
],
];
//Ver detalhes da API no https://developers.google.com/maps/documentation/geolocation/intro?hl=pt-br
$service_url = "https://www.googleapis.com/geolocation/v1/geolocate";
//Chave de acesso
$Curl_Data = array(
'key' => <YOUR KEY HERE>
);
$CurlQueryString = http_build_query($Curl_Data);
//Preparando o método a ser enviado os dados
$Metodo = array(
CURLOPT_URL => $service_url.'?'.$CurlQueryString // Define URL to be called
);
//Criando s string de dados
$DadosPost = json_encode($DadosLBS);
//Preparando as opções padrões do CUrl
$Curl_Adicional_Options = array(
CURLOPT_CUSTOMREQUEST => "POST"
,CURLOPT_POSTFIELDS => $DadosPost
,CURLOPT_RETURNTRANSFER => true // return web page
,CURLOPT_CONNECTTIMEOUT => 15 // time-out on connect
,CURLOPT_TIMEOUT => 15 // time-out on response
,CURLOPT_FAILONERROR => true //
,CURLOPT_HEADER => false // don't return headers
,CURLOPT_HTTPHEADER => array(
'Content-Type: application/json',
'Content-Length: ' . strlen($DadosPost)
) // Dados para o cabeçalho do post
,CURLOPT_FOLLOWLOCATION => true // follow redirects
,CURLOPT_MAXREDIRS => 10 // stop after 10 redirects
,CURLOPT_SSL_VERIFYPEER => false
,CURLOPT_SSL_VERIFYHOST => false
);
$Curl_Options = array_replace_recursive($Metodo,$Curl_Adicional_Options);
$cURLConn = curl_init();
curl_setopt_array($cURLConn, $Curl_Options);
$vDados['Curl']['Output'] = curl_exec($cURLConn);
$vDados['Curl']['Error'] = curl_error($cURLConn);
$vDados['Curl']['ErrorNum'] = curl_errno($cURLConn);
$vDados['Curl']['ErrorMsg'] = curl_strerror($vDados['Curl']['ErrorNum']);
$vDados['Curl']['Info'] = curl_getinfo($cURLConn);
curl_close($cURLConn);
if ($vDados['Curl']['ErrorNum'] != 0) {
$Dados['loc'] = array(
'status' => 'ERROR',
'error' => array(
'error_cod' => $vDados['Curl']['ErrorNum'],
'error_msg' => $vDados['Curl']['ErrorMsg']
)
);
return $Dados['loc'];
}
//Tratando as respostas
$vDados['Curl']['Dados'] = json_decode($vDados['Curl']['Output']) or die("Error: Cannot create object");
print_r($vDados['Curl']['Dados']);
Don't forget to create our key on google console.