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<!DOCTYPE html>
<html>
<head>
<title>QR Code Scanner by Panagiotis Bakas</title>
<link rel="stylesheet" href="bootstrap.min.css">
<script>
window.$ = window.jQuery = require('./jquery.min.js');
</script>
<script src="popper.min.js"></script>
<script src="bootstrap.min.js"></script>
<script src="instascan.min.js"></script>
<script src="axios.min.js"></script>
</head>
<body>
<header>
<div class="navbar navbar-dark bg-dark shadow-sm">
<div class="container d-flex justify-content-between">
<span class="navbar-brand d-flex align-items-center">
<strong>QR Code Scanner</strong>
</span>
<span class="nav-item">
<button type="button" class="btn btn-light" data-toggle="modal" data-target="#settingsModal">Settings</button>
</span>
</div>
</div>
</header>
<div class="alert alert-danger" role="alert" id="connection_lost" style="display: none;">
There is no connection with server.
</div>
<div class="alert alert-danger" role="alert" id="unknown_response" style="display: none;">
Unknown response from server.
</div>
<div class="container">
<div class="row">
<video id="preview" class="mx-auto"></video>
</div>
<table class="table table-striped mx-auto mt-1" id="latest_scans_table">
<thead>
<tr>
<th scope="col">Datetime</th>
<th scope="col">QR Code</th>
<th scope="col">Status</th>
</tr>
</thead>
<tbody id="latest_scans">
</tbody>
</table>
</div>
<!-- SETTINGS MODAL -->
<div class="modal fade" id="settingsModal" tabindex="-1" role="dialog" aria-labelledby="exampleModalLabel" aria-hidden="true">
<div class="modal-dialog" role="document">
<div class="modal-content">
<div class="modal-header">
<h5 class="modal-title" id="settingsModalLabel">Settings</h5><button type="button" data-toggle="tooltip" data-placement="top" title="qr_code_scanner_settings.conf in same directory with app" class="btn btn-info ml-3" onclick="loadSettings()">Load Settings from File</button>
<button type="button" class="close" data-dismiss="modal" aria-label="Close">
<span aria-hidden="true">×</span>
</button>
</div>
<div class="modal-body">
<h6>Select Camera:</h6>
<div class="form-group">
<select id="selected_camera" class="custom-select" onchange="useCamera()">
</select>
</div>
<h6>API URL:</h6>
<div class="row">
<div class="col-8">
<input type="text" class="form-control" id="url">
</div>
<div class="col-4">
<select id="selected_method" class="custom-select">
<option value="post">Post</option>
<option value="get">Get</option>
</select>
</div>
</div>
<form id="setting_form">
<h6>Responses:</h6>
<div class="row">
<div class="col">
<label for="success" class="col-form-label">Success:</label>
<input type="text" class="form-control" id="success">
</div>
<div class="col">
<label for="fail" class="col-form-label">Fail:</label>
<input type="text" class="form-control" id="fail">
</div>
</div>
<div class="form-group">
<label for="qrcode" class="col-form-label">Field name for QR Code:</label>
<input type="text" class="form-control" id="qrcode">
</div>
<h6>Fields:</h6>
</form>
<button class="btn btn-outline-primary mt-2" onclick="add_field()">Add Field</button>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-outline-success" id="save_settings_button" onclick="saveSettings()">Save Settings to File</button><div class="spinner-border text-success" id="save_settings_loader" style="display: none;" role="status"><span class="sr-only">Saving...</span></div>
<button type="button" class="btn btn-secondary" data-dismiss="modal">Close</button>
<button type="button" class="btn btn-primary" onclick="changeSettings()" data-dismiss="modal">Change Settings</button>
</div>
</div>
</div>
</div>
<!-- SETTINGS MODAL END -->
<script type="text/javascript">
//DEFAULT FIELD NAMES
var qrcode = "QRcode";
var success = "success";
var fail = "fail";
var url = "http://";
var selected_method = "post";
//SET VALUES OF FIELDS
$("#qrcode").val(qrcode);
$("#success").val(success);
$("#fail").val(fail);
$("#url").val(url);
$("#selected_method").val(selected_method);
///////////////////
var selected_camera = 0;
var scanner = new Instascan.Scanner({
video: document.getElementById('preview')
});
scanner.addListener('scan', function(content) {
let now = new Date();
let now_formatted = [
[AddZero(now.getDate()), AddZero(now.getMonth() + 1), now.getFullYear()].join("/"), [AddZero(now.getHours()), AddZero(now.getMinutes())].join(":"), now.getHours() >= 12 ? "PM" : "AM"
].join(" ");
let api_request_config = request_config_builder(content);
$("#unknown_response").hide();
axios(api_request_config).then((response) => {
if (response.data == success.trim()) {
$("#latest_scans").prepend("<tr><td>" + now_formatted + "</td><td>" + content + "</td><td><span class='text-success'>" + success + "</span></td></tr>");
let rowCount = $('#latest_scans tr').length;
if (rowCount > 5) {
$('#latest_scans tr').last().remove();
}
} else if (response.data == fail.trim()) {
$("#latest_scans").prepend("<tr><td>" + now_formatted + "</td><td>" + content + "</td><td><span class='text-danger'>" + fail + "</span></td></tr>");
let rowCount = $('#latest_scans tr').length;
if (rowCount > 5) {
$('#latest_scans tr').last().remove();
}
} else {
console.log(response);
$("#unknown_response").show();
}
}).catch(function(error) {
$("#latest_scans").prepend("<tr><td>" + now_formatted + "</td><td>" + content + "</td><td><span class='text-danger'>" + fail + "</span></td></tr>");
let rowCount = $('#latest_scans tr').length;
if (rowCount > 5) {
$('#latest_scans tr').last().remove();
}
});
});
Instascan.Camera.getCameras().then(function(cameras) {
if (cameras.length > 0) {
for (let i = 0; i < cameras.length; i++) {
try {
scanner.start(cameras[i]);
$("#selected_camera").val(i)
break;
} catch (err) {
console.log("Camera " + i + " not Available.");
}
}
appendCameras(cameras);
} else {
alert('No cameras found.');
}
}).catch(function(e) {
alert("Cannot access video input. Please check if camera is already used.");
});
function appendCameras(cameras) {
for (let i = 0; i < cameras.length; i++) {
$("#selected_camera").append('<option value="' + i + '">' + cameras[i].name + '</option>');
}
}
function useCamera() {
Instascan.Camera.getCameras().then(function(cameras) {
scanner.stop(cameras[selected_camera]);
selected_camera = $("#selected_camera").val();
if (cameras.length > 0) {
scanner.start(cameras[selected_camera]);
} else {
console.error('No cameras found.');
}
}).catch(function(e) {
console.error(e);
});
}
function AddZero(num) {
return (num >= 0 && num < 10) ? "0" + num : num + "";
}
function changeSettings() {
qrcode = $("#qrcode").val();
success = $("#success").val();
fail = $("#fail").val();
url = $("#url").val();
selected_method = $("#selected_method").val();
}
function saveSettings() {
let extra_fields = $(".extra-fields");
console.log(extra_fields);
let configuration = {};
let params = {};
configuration['url'] = url.trim();
configuration['method'] = selected_method.trim();
params[qrcode.trim()] = '';
for (let i = 0; i < extra_fields.length; i++) {
if ($(extra_fields[i]).find('.field-name').val().trim().length > 0) {
params[$(extra_fields[i]).find('.field-name').val().trim()] = $(extra_fields[i]).find('.field-value').val();
}
}
configuration['data'] = params;
$("#save_settings_loader").show();
let fs = require("fs");
fs.writeFile('qr_code_scanner_settings.conf', JSON.stringify(configuration), function(err) {
if (err) {
alert("Save Setting to File failed!");
}else{
$("#save_settings_button").html("Saved!");
}
});
$("#save_settings_loader").hide();
fs.readFile('qr_code_scanner_settings.conf', function (err, data) {
if (err) {
return console.error(err);
}
console.log("Asynchronous read: " + data.toString());
});
}
$('#settingsModal').on('hidden.bs.modal', function () {
$("#save_settings_button").html("Save Setting to File");
});
function add_field() {
let field = '<div class="row extra-fields mt-2"> <div class="col"> <input type="text" class="form-control field-name" placeholder="Field Name"> </div> <div class="col"> <input type="text" class="form-control field-value" placeholder="Field Value"> </div> </div>';
$("#setting_form").append(field);
}
function request_config_builder(content) {
let extra_fields = $(".extra-fields");
let configuration = {};
let params = new URLSearchParams();
configuration['url'] = url.trim();
configuration['method'] = selected_method.trim();
params.append(qrcode.trim(), content.trim());
for (let i = 0; i < extra_fields.length; i++) {
if ($(extra_fields[0]).find('.field-name').val().trim().length > 0) {
params.append($(extra_fields[0]).find('.field-name').val().trim(), $(extra_fields[0]).find('.field-value').val());
}
}
configuration['data'] = params;
return configuration;
}
setInterval(function() {
axios({
method: selected_method,
url: url
}).then((response) => {
$("#connection_lost").hide();
}).catch(function(error) {
$("#connection_lost").show();
});
}, 5000);
</script>
</body>
</html>