html - How to login with Google Account from my PHP application? -

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i need help. have been create php application , has sign in authentication access it. user table :

=========================================================== username | password |        email      |     e_pass =========================================================== admin    | admin    | mymail@google.com | mygooglepassword ===========================================================

username , password column local authentication, email , e_pass google authentication. so, how can that? both local , google authentication done @ same step? because google calendar , google drive embedded in php application , need google authentication access them.

here authentication code php code :

<?php if (empty($_post['userid']) or empty($_post['passwd'])) { // jika file diakses secara langsung ?>                <script type="text/javascript">                  alert("you can't access file directly!");                </script>";                <script> document.location.href='index.php'; </script> <?php    } else {     include "conn.php";     $user = $_post['userid'];     $pass = sha1($_post['passwd']);      $sql = mysql_query("select * access username = '$user'") or die (mysql_error());     $num = mysql_num_rows($sql);      if ($num <> 0) { // jika username ditemukan dalam tabel access         $sql = mysql_query("select * access password = '$pass'") or die (mysql_error());         $num = mysql_num_rows($sql);          if ($num <> 0) { // jika password ditemukan dalam table access             $sql = mysql_query("select * access username = '$user' , password = '$pass'") or die (mysql_error());             $data = mysql_fetch_array($sql);              // google authentication code supposed here              if ($data['unit'] == 'operational') { // jika unit operational                 session_start();                 $_session['id'] = $data['id'];                 $_session['unit'] = $data['unit'];                 $_session['sub'] = $data['subunit'];                  if ($data['subunit'] == 'manager') { // jika berstatus manager ?>                     <script>document.location.href='operational/manager/operational_manager.php?page=home';</script>                     <?php                 }                 else if ($data['subunit'] == 'facility') { ?>                     <script>document.location.href='operational/facility/facility.php?page=home';</script>                     <?php                 }                 else if ($data['subunit'] == 'transport') { ?>                     <script>document.location.href='operational/transportation/transport.php?page=home';</script>                     <?php                 }                 else if ($data['subunit'] == 'procure') { ?>                     <script>document.location.href='operational/procurement/procure.php?page=home';</script>                     <?php                 }                 else if ($data['subunit'] == 'it') { ?>                     <script>document.location.href='operational/it/it.php?page=home';</script>                     <?php                    }                 else if ($data['subunit'] == 'accounting') { ?>                     <script>document.location.href='operational/accounting/account.php?page=home';</script>                     <?php                    }             }             else if ($data['unit'] == 'academic') { // jika unit academic                 session_start();                 $_session['id'] = $data['id'];                 $_session['unit'] = $data['unit'];                 $_session['sub'] = $data['subunit'];                  if ($data['subunit'] == 'manager') { // jika berstatus manager ?>                     <script>document.location.href='academic/manager/academic_manager.php?page=home';</script>                     <?php                 }                 else { ?>                     <script>document.location.href='academic/academic.php?page=home';</script>                     <?php                 }             }             else if ($data['unit'] == 'bisdev') { // jika unit bisdev                 session_start();                 $_session['id'] = $data['id'];                 $_session['unit'] = $data['unit'];                 $_session['sub'] = $data['subunit'];                  if ($data['subunit'] == 'manager') { // jika berstatus manager ?>                     <script>document.location.href='bisdev/manager/bisdev_manager.php?page=home';</script>                     <?php                 }                 else { ?>                     <script>document.location.href='bisdev/bisdev.php?page=home';</script>                     <?php                 }             }             else if ($data['unit'] == 'admin') { // jika admin                 session_start();                 $_session['id'] = $data['id'];                 $_session['unit'] = $data['unit'];                 $_session['sub'] = $data['subunit'];                  ?>                     <script>document.location.href='admin/admin.php?page=home';</script>                 <?php             }             else if ($data['unit'] == 'director') { // jika director                 session_start();                 $_session['id'] = $data['id'];                 $_session['unit'] = $data['unit'];                 $_session['sub'] = $data['subunit'];                  ?>                     <script>document.location.href='director/director.php?page=home';</script>                 <?php             }         }         else if ($num == 0){ // jika password tidak ditemukan dalam table access             ?>                    <script type="text/javascript">                      alert("incorrect password!");                    </script>";                    <script> document.location.href='index.php'; </script>             <?php         }     }     else if($num == 0) { // jika username tidak ditemukan dalam tabel access         ?>                <script type="text/javascript">                  alert("username not registered!");                </script>";                <script> document.location.href='index.php'; </script>         <?php        } } ?>

you should not use email , password directly. should use oauth 2.0. can learn more oauth here.

you should store user's access token instead of email id's password.


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