<?php
//Add the below credentials to a separate file and call here using include
/***************oAuth2 Connected App Credentials************************************/
define("CLIENT_ID", "<Replace with your Client Id");
define("CLIENT_SECRET", "Replace with your Client Secret");
define("REDIRECT_URI", "Replace with Redirect URI");
define("LOGIN_URI", "Replace with your Login URI");
define("USER_NAME", "Your Username to login to Salesforce");
define("PASSWORD", "Your Password to login to Salesforce");
define("SECURITY_TOKEN", "Your security token");

/***************oAuth2 Connected App Credentials************************************/

$token_url = LOGIN_URI . "/services/oauth2/token";
//Login to Salesforce
$params =  "&grant_type=password"
    . "&client_id=" . CLIENT_ID
    . "&client_secret=" . CLIENT_SECRET
    . "&username=".USER_NAME
	."&password=".PASSWORD
	."&security_token=".SECURITY_TOKEN;

$curl = curl_init($token_url);

//curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, true);
curl_setopt($curl, CURLOPT_HEADER, false);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_POST, true);
curl_setopt($curl, CURLOPT_POSTFIELDS, $params);

$json_response = curl_exec($curl);

$status = curl_getinfo($curl, CURLINFO_HTTP_CODE);

if ( $status != 200 ) {
	$errstr="Error: call to token URL $token_url failed with status $status, response $json_response, curl_error " . curl_error($curl) . ", curl_errno " . curl_errno($curl).'<br>';
    //die("Error: call to token URL $token_url failed with status $status, response $json_response, curl_error " . curl_error($curl) . ", curl_errno " . curl_errno($curl));
}

curl_close($curl);

$response = json_decode($json_response, true);

$access_token = $response['access_token'];
$instance_url = $response['instance_url'];

if (!isset($access_token) || $access_token == "") {
	$errstr=$errstr." Error - access token missing from response!".'<br>';
   // die("Error - access token missing from response!");
}

if (!isset($instance_url) || $instance_url == "") {
	$errstr=$errstr." Error - instance URL missing from response!".'<br>';
   // die("Error - instance URL missing from response!");
}
//Get the user uploaded file
$file = $_FILES["file"]["tmp_name"];
$remote_file = $_FILES["file"]["name"];

$post_text=[
    "Description" => "Example File",
    "Keywords" =>  "Rest API File Upload",
    "FolderId" => "Replace with your Folder Id",
    "Name" => "Example Name",
    "Type" => "pdf",
	"body" => base64_encode(file_get_contents($file)),
];
$json_test=json_encode($post_text);
//Upload the file to Documents

$url=$instance_url."/services/data/v45.0/sobjects/Document/";
 $curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_CUSTOMREQUEST, "POST");
 curl_setopt($curl, CURLOPT_HTTPHEADER,array("Authorization: OAuth $access_token","Content-type: application/json;boundary:a7V4kRcFA8E79pivMuV2tukQ85cmNKeoEgJgq"));
curl_setopt($curl, CURLOPT_POST, true);				   
    curl_setopt($curl, CURLOPT_VERBOSE, 1);
    curl_setopt($curl, CURLOPT_POSTFIELDS, $json_test);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($curl, CURLINFO_HEADER_OUT, true);
 $json_response = curl_exec($curl);

    $status = curl_getinfo($curl, CURLINFO_HTTP_CODE);

    if ( $status != 201 ) {
        error_log("Error: call to URL $url failed with status $status, response $json_response, curl_error " . curl_error($curl) . ", curl_errno " . curl_errno($curl));
		//echo "error_message";
		exit;
    }
?>