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qr-legacy.html
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qr-legacy.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<!-- Make sure that no communication with external sites is possible -->
<meta http-equiv="Content-Security-Policy" content="default-src 'none'; script-src 'unsafe-inline'; style-src 'unsafe-inline'; img-src data:;">
<title>Offline QR code generator</title>
<script>
console.log("Offline QR code generator by github.com/six-two - Version 2024-09-14 - qr-creator Engine")
const get_or_default_int = (name, default_value) => {
const stored = localStorage.getItem(name);
if (stored != null) {
try {
return parseInt(stored);
} catch (error) {
console.warn(`Failed to parse stored entry for '${name}'`);
}
}
return default_value;
}
// ================== Start of user settings ==================
// You can modify these settings without breaking stuff
// Thanks to @d3xbot for providing the numbers
// ERROR_CORRECTION_LEVEL L – up to 7% damage - MAX_TEXT_LENGTH: 2953
// ERROR_CORRECTION_LEVEL M – up to 15% damage - MAX_TEXT_LENGTH: 2331
// ERROR_CORRECTION_LEVEL Q – up to 25% damage - MAX_TEXT_LENGTH: 1663
// ERROR_CORRECTION_LEVEL H – up to 30% damage - MAX_TEXT_LENGTH: 1273
let ERROR_CORRECTION_LEVEL = localStorage.getItem("ERROR_CORRECTION_LEVEL") || "L";
// Allow users to enable the clipboard monitoring function. Set this to false to hide the checkbox
let SHOW_CLIPBOARD_MONITORING_CONTROLS = true;
// Size of the QR code in pixels. Set it to 0 to automatically fit the free space
let QR_MIN_SIZE = get_or_default_int("QR_MIN_SIZE", 30); //in pixels
let QR_MAX_SIZE = get_or_default_int("QR_MAX_SIZE", Infinity); // in pixels
// If you want a border around the QR code (that will stay when you right click -> "Save image as..." the image, set this to something greater than zero)
let QR_BORDER_SIZE = get_or_default_int("QR_BORDER_SIZE", 0); // in pixels
let QR_BORDER_COLOR = localStorage.getItem("QR_BORDER_COLOR") || "#909090"; // standard html color codes
// =================== End of user settings ===================
</script>
<style>
* {
box-sizing: border-box;
}
body {
width: 100vw;
height: 100vh;
max-height: 100vh;
margin: 0px;
padding: 0px;
display: flex;
flex-direction: column;
background-color: lightgray;
overflow: hidden;
}
header {
width: 100%;
min-height: 40px;
background-color: #444;
color: lightgray;
display: flex;
font-size: 25px;
padding: 5px;
}
header a, header .button {
color: lightgray;
margin-right: 20px;
}
header .button {
cursor: pointer;
text-decoration: underline
}
.expand {
flex: 1;
}
#text-and-qr {
flex: 1;
display: flex;
flex-direction: column;
padding: 5px;
}
#input-div {
min-height: 100px;
min-width: 200px;
flex: 1;
display: flex;
flex-direction: column;
}
#input {
width: 100%;
height: 100%;
flex: 1;
resize: none;
}
#input-error {
margin-bottom: 10px;
display: none;
}
.error {
width: 100%;
background-color: rgb(255, 140, 140);
border: 2px solid red;
border-radius: 10px;
padding: 5px;
}
#qrcode {
width: 100%;
height: 100%;
padding: 5px;
}
#qrcode canvas {
margin: auto;
display: block;
}
</style>
</head>
<body>
<header id="header">
<div class="title">Offline QR code generator</div>
<div class="expand"></div>
<div id="monitor-clipboard" class="button"></div>
<a id="download" href="" download>Download</a>
<a href="https://github.com/six-two/qr.html" target="_blank" rel="noopener noreferrer">Source code</a>
</header>
<div id="text-and-qr">
<div id="input-div">
<div id="input-error" class="error"></div>
<textarea id="input" name="input" placeholder="Type the data you want to convert to a QR code here. Alternatively you can try to drag and drop or copy-paste a file in this text box, but not all browsers/operating systems support that." id="" autofocus>You can generate QR codes from any text by typing in in this box. The code generation is performed on your local device, no data is sent anywhere.
You can even download this file (see button on the top right) and use it when you are not connected to the Internet.
If the layout looks strange, try resizing your browser window. It always tries to maximize the QR code's size, which can look strange sometimes.
⚠️ The maximum size of a QR code is 2953 bytes (one character is normally one byte, although foreign language characters and emojis take up multiple bytes)
⚠️ Some features will not work in some browsers. In my experience Google Chrome works best.
🎉 This should now also work with Emojis
📁 You can now drag and drop a file in this text box
📁 And you can copy-paste a file to this text area
Here are some examples of what you can do with QR codes:
- Link to a website: https://your-website.com/some/page?with=parameters
- Share email address: mailto:your.name@gmail.com
- Share phone number: tel:+49123456789
- Share WLAN network password: WIFI:T:WPA;S:Your WLAN name;P:Your WLAN password;;
- Send SMS: smsto:+49123456789:Hi John, how are you?
- Send email: mailto:recipient@example.com?subject=Test email&body=This is a test email
- Add second factor to Google Authenticator: otpauth://totp/Issuer Name:alice@google.com?secret=JBSWY3DPEHPK3PXP&issuer=Issuer Name
</textarea>
</div>
<div id="qrcode"><div class="error">You need to enable JavaScript to use this page</div></div>
</div>
<script type="text/javascript">
// Automatically select the matching maximum size
const MAX_TEXT_LENGTH_FOR = {
"L": 2953,
"M": 2331,
"Q": 1663,
"H": 1273,
};
const header = document.getElementById("header");
const qrcode = document.getElementById("qrcode");
const input_area = document.getElementById("input");
const input_error = document.getElementById("input-error");
const text_and_qr = document.getElementById("text-and-qr");
const onHashUpdate = () => {
if (location.hash.length > 1) {
let initial_value = location.hash.slice(1); // remove leading '#'
initial_value = decodeURIComponent(initial_value); // URL encoded because of special characters
console.log("Using initial value from URL hash:", initial_value);
input_area.value = initial_value;
}
}
// You can set the initial value of the page via the # after the URL. This enables stuff like links and bookmarks for common values
// we use the hash instead of an URL parameter, since the hash is never sent to a server -> better privacy (only relevant if you use the hosted version)
onHashUpdate();
// If the user changes the hash, we should update the text box with it
window.addEventListener("hashchange", onHashUpdate);
const PADDING = 10; // 5px on any side for the text-and-qr element -> always 10px in total
const showInputError = (message) => {
// message is untrusted input, so we should escape it properly
if (message) {
input_error.innerHTML = ""; // remove current children
const messageElement = document.createTextNode(message);
input_error.appendChild(messageElement);
input_error.style.display = "block";
} else {
input_error.style.display = "none";
}
}
const showQrCodeGenerationError = (message) => {
// Bad practice, but XSS should not be possible
qrcode.innerHTML = `<div class="error"><b>QR code generation failed:</b><br>${message}</div>`;
}
const updateQRCode = () => {
const max_size_fit_window = Math.min(qrcode.clientWidth, qrcode.clientHeight, QR_MAX_SIZE);
const qr_size = Math.max(QR_MIN_SIZE, max_size_fit_window) - 10; // remove 2 * 5px for the paddings
text = input_area.value;
const max_length = MAX_TEXT_LENGTH_FOR[ERROR_CORRECTION_LEVEL];
if (!text) {
showQrCodeGenerationError("You need to type some text in the input area! It will then be rendered as a QR code.");
} else if (text.length > max_length) {
// If the error correction level is not L, add the suggestion of lowering it to allow more contents
let level_text = "", suggestion = "";
if (ERROR_CORRECTION_LEVEL != "L") {
level_text = ` with error correction level '${ERROR_CORRECTION_LEVEL}'`;
suggestion = ` You could also try to decrease the ERROR_CORRECTION_LEVEL setting. At level 'L' the maximum size would be ${MAX_TEXT_LENGTH_FOR["L"]} characters.`;
}
showQrCodeGenerationError(`Your text is ${text.length} characters long. Sadly, due to technical limitations, the maximum QR code size${level_text} is ${max_length} characters. Try splitting your text into multiple smaller parts.${suggestion}`);
} else {
// Delete the error message (in case it existed) or the old QR code
qrcode.innerHTML = "";
// @TODO: I probably could do that border stuff more efficiently if I prepared a canvas and passed it to the render method
try {
QrCreator.render({
text: text,
radius: 0.0, // square pixels
ecLevel: ERROR_CORRECTION_LEVEL,
fill: '#000000',
background: "#ffffff",
size: qr_size - 2 * QR_BORDER_SIZE,
}, qrcode);
if (QR_BORDER_SIZE > 0) {
const canvas = qrcode.getElementsByTagName("canvas")[0];
// copy the old image
const image = document.createElement("img");
image.src = canvas.toDataURL();
ctx = canvas.getContext('2d');
// clear the whole image by filling it with the border color
ctx.fillStyle = QR_BORDER_COLOR;
ctx.fillRect(0, 0, qr_size, qr_size);
// Copy the saved image, but make it smaller, so that a bit of the border remains
ctx.drawImage(image, 0, 0, qr_size, qr_size,
QR_BORDER_SIZE, QR_BORDER_SIZE, qr_size - 2 * QR_BORDER_SIZE, qr_size - 2 * QR_BORDER_SIZE);
console.log(QR_BORDER_SIZE, qr_size - 2 * QR_BORDER_SIZE);
}
} catch (error) {
showQrCodeGenerationError("Failed to generate the QR code! Please try a shorter text and try removing special characters and emojis. If you are a programmer, look in the prowser console for the error message");
console.error("Error while generating QR code", error);
}
}
};
const handleFileUpload = (files) => {
if (files.length == 1) {
files[0].text().then(file_text => {
console.log("Received file:\n", file_text);
// Update the text field and the QR code
input_area.value = file_text
showInputError();
updateQRCode();
}).catch(error => {
showInputError(`Error reading the file: ${error}`);
})
} else {
showInputError(`Received ${files.length} files. Please use only one file at a time.`);
}
};
// Handle pasting a file (copying if in file manager and them pressing Crtl-V [Cmd-V on Mac] while in the browser)
document.addEventListener("paste", async e => {
if (e.clipboardData.files.length == 0) {
// do not prevent the default action, since it would break normal copy + paste
return
} else {
// process files as a file upload
e.preventDefault();
handleFileUpload(e.clipboardData.files)
}
});
// Support drag and drop for the input element
input_area.addEventListener("drop", e => {
// process files as a file upload
e.preventDefault();
handleFileUpload(e.dataTransfer.files)
return false;
});
// Update the QR code whenever the text or the window size changes
// Use max-width/height to keep the QR code div in square shape and allow the textarea to use the remaining space
input_area.addEventListener("input", updateQRCode);
const on_window_resize = () => {
const width = text_and_qr.clientWidth;
const height = text_and_qr.clientHeight;
if (!width || !height) {
console.warn(`Size can not be 0 or undefined. But size is (${width}, ${height})`)
}
const toStyleValue = (size_in_pixels) => {
return `${Math.max(size_in_pixels - PADDING, 0)}px`
}
if (width < height) {
const remaining_height = document.body.clientHeight - header.clientHeight - 100; // 100 is the minimum height of the input area div
// portrait view -> vertical
text_and_qr.style.flexDirection = "column";
qrcode.style.maxWidth = "";
qrcode.style.maxHeight = toStyleValue(Math.min(width, remaining_height));
} else {
// landscape view -> horizontal
const remaining_width = document.body.clientWidth - 200; // 200 is the minimum width of the input area div
text_and_qr.style.flexDirection = "row";
qrcode.style.maxWidth = toStyleValue(Math.min(height, remaining_width));
// Workaround for QR code not shrinking
qrcode.style.maxHeight = toStyleValue(document.body.clientHeight - header.clientHeight);
}
updateQRCode();
};
window.addEventListener("resize", on_window_resize);
// sometimes the event does not get called (for example when closing the browser console). So we call it regularly just to be sure
setInterval(on_window_resize, 1000)
// Call it shortly after loading the page to determine the inital layout
setTimeout(on_window_resize, 10);
if (SHOW_CLIPBOARD_MONITORING_CONTROLS) {
let monitor_clipboard_enabled = false;
let clipboard_interval_handle;
const monitor_clipboard_menuitem = document.getElementById("monitor-clipboard");
const update_cb_mon_menuitem = () => monitor_clipboard_menuitem.innerHTML = monitor_clipboard_enabled ? "Stop clipboard monitoring" : "Start clipboard monitoring";
monitor_clipboard_menuitem.addEventListener("click", () => {
if (window.isSecureContext) {
if (monitor_clipboard_enabled) {
console.log("Stopping clipboard monitoring");
clearInterval(clipboard_interval_handle);
monitor_clipboard_enabled = false;
showInputError(); // clear the error just in case it was caused by the clipboard
} else {
console.log("Starting clipboard monitoring");
clipboard_interval_handle = setInterval(check_clipboard, 100);
monitor_clipboard_enabled = true;
}
} else {
if (monitor_clipboard_enabled) {
// enable the user to hide the message by pressing stop
showInputError();
} else {
showInputError("Clipboard can not be monitored, because the page is not a secure context. See https://developer.mozilla.org/en-US/docs/Web/Security/Secure_Contexts for more details.")
}
monitor_clipboard_enabled = !monitor_clipboard_enabled;
}
update_cb_mon_menuitem()
});
update_cb_mon_menuitem();
let last_value_copied = "";
const check_clipboard = () => {
if (monitor_clipboard_enabled) {
console.debug("Reading clipboard");
let clipboard_promise;
try {
clipboard_promise = navigator.clipboard.readText();
} catch (error) {
// Firefox (at least on Linux and Mac) causes this
showInputError('Failed to read clipboard contents. This is a known problem in Firefox, please try using a different Browser like Chrome, Edge, etc (anything except Internet Explorer). If you only have Firefox, you could enable Clipboard access by typing "about:config" in the URL bar, searching for "dom.events.testing.asyncClipboard" and setting it to true (by double clicking). Afterwards you can reload the page. Please note, that doing this may have severe security implications, since other websites will be able to read your clipboard, which may contain sensitive information such as passwords.');
return;
}
clipboard_promise.then(
clip_text => {
// Only update the text when a different value is copied. This allows the user to change the text without it being reset every second.
if (clip_text && clip_text != last_value_copied) {
input.value = clip_text;
last_value_copied = clip_text;
}
showInputError();
}
).catch(error => {
// This error only occured on Mac with Safari
showInputError(`Failed to read clipboard contents because of the following error: ${error}`);
});
}
};
}
// ======= https://github.com/nimiq/qr-creator, MIT License, Copyright (c) 2017 The Nimiq Foundation =======
// Minified version from https://cdn.jsdelivr.net/npm/qr-creator/dist/qr-creator.min.js
/* jquery-qrcode v0.14.0 - https://larsjung.de/jquery-qrcode/ */
'use strict';let G=null;class H{}H.render=function(w,B){G(w,B)};self.QrCreator=H;
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