Add configurable QR code page
This commit is contained in:
parent
c4afd3c253
commit
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7 changed files with 610 additions and 20 deletions
3
.gitignore
vendored
3
.gitignore
vendored
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@ -1 +1,4 @@
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AGENTS.md
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# Local/server QR data; may contain secrets such as Wi-Fi passwords
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what.json
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6
.htaccess
Normal file
6
.htaccess
Normal file
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@ -0,0 +1,6 @@
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Options -Indexes
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DirectoryIndex index.php
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<FilesMatch "^(what\.json|AGENTS\.md|deploy\.sh)$">
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Require all denied
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</FilesMatch>
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43
README.md
43
README.md
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@ -1,11 +1,52 @@
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# qr
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Static webpage intended to be hosted at:
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QR-code webpage intended to be hosted at:
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```text
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192.168.0.226:/var/www/html/qr
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```
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Open QR codes with:
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```text
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http://192.168.0.226/qr?what=wifi
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http://192.168.0.226/qr?what=haguest
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```
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If `what` is not defined in `what.json`, the page returns `404 Not Found`.
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## QR data
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Copy the example on the web server:
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```bash
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cp what.example.json what.json
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```
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Edit `what.json` on the server. It is ignored by git and excluded from deploys because it may contain secrets like Wi-Fi passwords.
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Supported entries:
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```json
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{
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"wifi": {
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"type": "wifi",
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"label": "Home Wi-Fi",
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"ssid": "Your WiFi name",
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"password": "Your WiFi password",
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"security": "WPA",
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"hidden": false
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},
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"haguest": {
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"type": "url",
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"label": "HA Guest",
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"url": "http://192.168.0.226/haguest"
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}
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}
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```
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The key name, such as `wifi` or `haguest`, is shown in the centre of the QR code.
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## Deploy
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```bash
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@ -7,7 +7,9 @@ DEST="${QR_DEPLOY_DEST:-/var/www/html/qr}"
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rsync -av --delete \
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--exclude '.git/' \
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--exclude 'AGENTS.md' \
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--exclude 'what.json' \
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--exclude '.DS_Store' \
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./ "${HOST}:${DEST}/"
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echo "Deployed to ${HOST}:${DEST}"
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echo "Remember to create/update ${DEST}/what.json on the server."
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19
index.html
19
index.html
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@ -1,19 +0,0 @@
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<!doctype html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<title>QR</title>
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<style>
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:root { color-scheme: light dark; font-family: system-ui, sans-serif; }
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body { margin: 0; min-height: 100vh; display: grid; place-items: center; }
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main { text-align: center; padding: 2rem; }
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</style>
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</head>
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<body>
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<main>
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<h1>QR</h1>
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<p>QR webpage placeholder.</p>
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</main>
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</body>
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</html>
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542
index.php
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542
index.php
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@ -0,0 +1,542 @@
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<?php
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declare(strict_types=1);
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const DATA_FILE = __DIR__ . '/what.json';
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function not_found(): never
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{
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http_response_code(404);
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header('Content-Type: text/plain; charset=utf-8');
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echo "404 Not Found\n";
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exit;
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}
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function fail(int $status, string $message): never
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{
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http_response_code($status);
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header('Content-Type: text/plain; charset=utf-8');
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echo $message . "\n";
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exit;
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}
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function h(string $value): string
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{
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return htmlspecialchars($value, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
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}
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function wifi_escape(string $value): string
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{
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return strtr($value, [
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'\\' => '\\\\',
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';' => '\\;',
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',' => '\\,',
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':' => '\\:',
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'"' => '\\"',
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]);
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}
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function qr_entry_to_payload(string $key, mixed $entry): ?array
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{
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if (is_string($entry)) {
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return [
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'payload' => $entry,
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'title' => $key,
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'subtitle' => 'Scan this QR code.',
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'link' => filter_var($entry, FILTER_VALIDATE_URL) ? $entry : null,
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];
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}
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if (!is_array($entry)) {
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return null;
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}
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$type = strtolower((string)($entry['type'] ?? ''));
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$label = (string)($entry['label'] ?? $key);
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if ($type === 'wifi' || isset($entry['ssid'])) {
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$ssid = (string)($entry['ssid'] ?? '');
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if ($ssid === '') {
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return null;
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}
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$security = strtoupper((string)($entry['security'] ?? $entry['encryption'] ?? 'WPA'));
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if (in_array($security, ['', 'NONE', 'OPEN', 'NOPASS'], true)) {
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$security = 'nopass';
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}
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$hidden = !empty($entry['hidden']) ? 'true' : 'false';
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$payload = 'WIFI:T:' . wifi_escape($security) . ';S:' . wifi_escape($ssid) . ';';
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if ($security !== 'nopass') {
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$payload .= 'P:' . wifi_escape((string)($entry['password'] ?? '')) . ';';
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}
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$payload .= 'H:' . $hidden . ';;';
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return [
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'payload' => $payload,
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'title' => $label,
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'subtitle' => 'Scan to connect to ' . $ssid,
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'link' => null,
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];
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}
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$payload = $entry['url'] ?? $entry['text'] ?? $entry['payload'] ?? null;
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if (!is_string($payload) || $payload === '') {
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return null;
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}
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return [
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'payload' => $payload,
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'title' => $label,
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'subtitle' => filter_var($payload, FILTER_VALIDATE_URL) ? $payload : 'Scan this QR code.',
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'link' => filter_var($payload, FILTER_VALIDATE_URL) ? $payload : null,
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];
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}
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final class QrCode
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{
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private const ECC_CODEWORDS_PER_BLOCK = [1 => 10, 2 => 16, 3 => 26, 4 => 18, 5 => 24, 6 => 16, 7 => 18, 8 => 22, 9 => 22, 10 => 26];
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private const DATA_CODEWORDS_PER_BLOCK = [
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1 => [16],
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2 => [28],
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3 => [44],
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4 => [32, 32],
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5 => [43, 43],
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6 => [27, 27, 27, 27],
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7 => [31, 31, 31, 31],
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8 => [38, 38, 39, 39],
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9 => [36, 36, 36, 37, 37],
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10 => [43, 43, 43, 43, 44],
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];
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private const ALIGNMENT_POSITIONS = [
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1 => [],
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2 => [6, 18],
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3 => [6, 22],
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4 => [6, 26],
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5 => [6, 30],
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6 => [6, 34],
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7 => [6, 22, 38],
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8 => [6, 24, 42],
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9 => [6, 26, 46],
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10 => [6, 28, 50],
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];
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/** @var array<int,int> */
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private static array $gfExp = [];
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/** @var array<int,int> */
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private static array $gfLog = [];
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private int $version;
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private int $size;
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/** @var array<int,array<int,bool>> */
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private array $modules;
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/** @var array<int,array<int,bool>> */
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private array $isFunction;
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private function __construct(int $version)
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{
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$this->version = $version;
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$this->size = 21 + 4 * ($version - 1);
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$row = array_fill(0, $this->size, false);
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$this->modules = array_fill(0, $this->size, $row);
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$this->isFunction = array_fill(0, $this->size, $row);
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}
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public static function fromText(string $text): self
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{
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$bytes = array_values(unpack('C*', $text) ?: []);
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$version = self::chooseVersion(count($bytes));
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$qr = new self($version);
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$qr->drawFunctionPatterns();
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$dataCodewords = $qr->makeDataCodewords($bytes);
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$allCodewords = self::addEccAndInterleave($version, $dataCodewords);
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$qr->drawCodewords($allCodewords, 0);
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$qr->drawFormatBits(0);
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return $qr;
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}
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public function toSvg(string $centerText = '', int $border = 4): string
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{
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$fullSize = $this->size + $border * 2;
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$svg = '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 ' . $fullSize . ' ' . $fullSize . '" role="img" aria-label="QR code">';
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$svg .= '<rect width="100%" height="100%" rx="2" fill="#fff"/>';
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$svg .= '<g fill="#111">';
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for ($y = 0; $y < $this->size; $y++) {
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for ($x = 0; $x < $this->size; $x++) {
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if ($this->modules[$y][$x]) {
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$svg .= '<rect x="' . ($x + $border) . '" y="' . ($y + $border) . '" width="1" height="1" rx="0.18"/>';
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}
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}
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}
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$svg .= '</g>';
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if ($centerText !== '') {
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$safeText = htmlspecialchars($centerText, ENT_QUOTES | ENT_SUBSTITUTE, 'UTF-8');
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$chars = max(1, strlen($centerText));
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$badgeWidth = min($this->size * 0.48, max($this->size * 0.25, $chars * 1.15 + 4));
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$badgeHeight = max(4.8, min(6.2, $this->size * 0.18));
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$x = ($fullSize - $badgeWidth) / 2;
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$y = ($fullSize - $badgeHeight) / 2;
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$fontSize = min(3.2, max(2.1, ($badgeWidth - 2) / ($chars * 0.62)));
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$svg .= '<rect x="' . $x . '" y="' . $y . '" width="' . $badgeWidth . '" height="' . $badgeHeight . '" rx="' . ($badgeHeight / 2) . '" fill="#fff" stroke="#111" stroke-width="0.45"/>';
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$svg .= '<text x="' . ($fullSize / 2) . '" y="' . ($fullSize / 2) . '" fill="#111" font-family="system-ui, -apple-system, Segoe UI, sans-serif" font-size="' . $fontSize . '" font-weight="800" text-anchor="middle" dominant-baseline="central">' . $safeText . '</text>';
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}
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$svg .= '</svg>';
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return $svg;
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}
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private static function chooseVersion(int $byteLength): int
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{
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for ($version = 1; $version <= 10; $version++) {
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$countBits = $version <= 9 ? 8 : 16;
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$capacityBits = array_sum(self::DATA_CODEWORDS_PER_BLOCK[$version]) * 8;
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if (4 + $countBits + $byteLength * 8 <= $capacityBits) {
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return $version;
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}
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}
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fail(413, 'QR payload is too long.');
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}
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/** @param array<int,int> $bytes @return array<int,int> */
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private function makeDataCodewords(array $bytes): array
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{
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$capacityBits = array_sum(self::DATA_CODEWORDS_PER_BLOCK[$this->version]) * 8;
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$bits = [];
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self::appendBits($bits, 0b0100, 4); // Byte mode
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self::appendBits($bits, count($bytes), $this->version <= 9 ? 8 : 16);
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foreach ($bytes as $byte) {
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self::appendBits($bits, $byte, 8);
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}
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$terminator = min(4, $capacityBits - count($bits));
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for ($i = 0; $i < $terminator; $i++) {
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$bits[] = 0;
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}
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while (count($bits) % 8 !== 0) {
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$bits[] = 0;
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}
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$result = [];
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for ($i = 0; $i < count($bits); $i += 8) {
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$byte = 0;
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for ($j = 0; $j < 8; $j++) {
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$byte = ($byte << 1) | $bits[$i + $j];
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}
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$result[] = $byte;
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}
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$pad = [0xEC, 0x11];
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for ($i = 0; count($result) < intdiv($capacityBits, 8); $i++) {
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$result[] = $pad[$i % 2];
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}
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return $result;
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}
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/** @param array<int,int> $bits */
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private static function appendBits(array &$bits, int $value, int $length): void
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{
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for ($i = $length - 1; $i >= 0; $i--) {
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$bits[] = ($value >> $i) & 1;
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}
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}
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/** @param array<int,int> $data @return array<int,int> */
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private static function addEccAndInterleave(int $version, array $data): array
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{
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$blockLengths = self::DATA_CODEWORDS_PER_BLOCK[$version];
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$eccLength = self::ECC_CODEWORDS_PER_BLOCK[$version];
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$divisor = self::reedSolomonDivisor($eccLength);
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$blocks = [];
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$offset = 0;
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foreach ($blockLengths as $length) {
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$blockData = array_slice($data, $offset, $length);
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$offset += $length;
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$blocks[] = ['data' => $blockData, 'ecc' => self::reedSolomonRemainder($blockData, $divisor)];
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}
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$result = [];
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$maxData = max($blockLengths);
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for ($i = 0; $i < $maxData; $i++) {
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foreach ($blocks as $block) {
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if ($i < count($block['data'])) {
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$result[] = $block['data'][$i];
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}
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}
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}
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for ($i = 0; $i < $eccLength; $i++) {
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foreach ($blocks as $block) {
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$result[] = $block['ecc'][$i];
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}
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}
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return $result;
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}
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/** @return array<int,int> */
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private static function reedSolomonDivisor(int $degree): array
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{
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self::initGalois();
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$result = array_fill(0, $degree, 0);
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$result[$degree - 1] = 1;
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$root = 1;
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for ($i = 0; $i < $degree; $i++) {
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for ($j = 0; $j < $degree; $j++) {
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$result[$j] = self::gfMultiply($result[$j], $root);
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if ($j + 1 < $degree) {
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$result[$j] ^= $result[$j + 1];
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}
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}
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$root = self::gfMultiply($root, 0x02);
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}
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return $result;
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}
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/** @param array<int,int> $data @param array<int,int> $divisor @return array<int,int> */
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private static function reedSolomonRemainder(array $data, array $divisor): array
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{
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$result = array_fill(0, count($divisor), 0);
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foreach ($data as $byte) {
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$factor = $byte ^ $result[0];
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array_shift($result);
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$result[] = 0;
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foreach ($divisor as $i => $coefficient) {
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$result[$i] ^= self::gfMultiply($coefficient, $factor);
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}
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}
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return $result;
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}
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private static function initGalois(): void
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{
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if (self::$gfExp !== []) {
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return;
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}
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$x = 1;
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for ($i = 0; $i < 255; $i++) {
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self::$gfExp[$i] = $x;
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self::$gfLog[$x] = $i;
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$x <<= 1;
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if (($x & 0x100) !== 0) {
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$x ^= 0x11D;
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}
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}
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for ($i = 255; $i < 512; $i++) {
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self::$gfExp[$i] = self::$gfExp[$i - 255];
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}
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}
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private static function gfMultiply(int $x, int $y): int
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{
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if ($x === 0 || $y === 0) {
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return 0;
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}
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return self::$gfExp[self::$gfLog[$x] + self::$gfLog[$y]];
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}
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private function drawFunctionPatterns(): void
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{
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$this->drawFinderPattern(3, 3);
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$this->drawFinderPattern($this->size - 4, 3);
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$this->drawFinderPattern(3, $this->size - 4);
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for ($i = 0; $i < $this->size; $i++) {
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if (!$this->isFunction[6][$i]) {
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$this->setFunctionModule($i, 6, $i % 2 === 0);
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}
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if (!$this->isFunction[$i][6]) {
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$this->setFunctionModule(6, $i, $i % 2 === 0);
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}
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}
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foreach (self::ALIGNMENT_POSITIONS[$this->version] as $x) {
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foreach (self::ALIGNMENT_POSITIONS[$this->version] as $y) {
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if (!$this->isFunction[$y][$x]) {
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$this->drawAlignmentPattern($x, $y);
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}
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}
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}
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$this->drawFormatBits(0);
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if ($this->version >= 7) {
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$this->drawVersionBits();
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}
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}
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private function drawFinderPattern(int $cx, int $cy): void
|
||||
{
|
||||
for ($dy = -4; $dy <= 4; $dy++) {
|
||||
for ($dx = -4; $dx <= 4; $dx++) {
|
||||
$x = $cx + $dx;
|
||||
$y = $cy + $dy;
|
||||
if ($x < 0 || $x >= $this->size || $y < 0 || $y >= $this->size) {
|
||||
continue;
|
||||
}
|
||||
$dist = max(abs($dx), abs($dy));
|
||||
$this->setFunctionModule($x, $y, $dist !== 2 && $dist !== 4);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
private function drawAlignmentPattern(int $cx, int $cy): void
|
||||
{
|
||||
for ($dy = -2; $dy <= 2; $dy++) {
|
||||
for ($dx = -2; $dx <= 2; $dx++) {
|
||||
$this->setFunctionModule($cx + $dx, $cy + $dy, max(abs($dx), abs($dy)) !== 1);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
private function drawFormatBits(int $mask): void
|
||||
{
|
||||
$data = $mask; // Medium ECC has format bits 00.
|
||||
$rem = $data;
|
||||
for ($i = 0; $i < 10; $i++) {
|
||||
$rem = ($rem << 1) ^ ((($rem >> 9) & 1) * 0x537);
|
||||
}
|
||||
$bits = (($data << 10) | ($rem & 0x3FF)) ^ 0x5412;
|
||||
|
||||
for ($i = 0; $i <= 5; $i++) {
|
||||
$this->setFunctionModule(8, $i, (($bits >> $i) & 1) !== 0);
|
||||
}
|
||||
$this->setFunctionModule(8, 7, (($bits >> 6) & 1) !== 0);
|
||||
$this->setFunctionModule(8, 8, (($bits >> 7) & 1) !== 0);
|
||||
$this->setFunctionModule(7, 8, (($bits >> 8) & 1) !== 0);
|
||||
for ($i = 9; $i < 15; $i++) {
|
||||
$this->setFunctionModule(14 - $i, 8, (($bits >> $i) & 1) !== 0);
|
||||
}
|
||||
|
||||
for ($i = 0; $i < 8; $i++) {
|
||||
$this->setFunctionModule($this->size - 1 - $i, 8, (($bits >> $i) & 1) !== 0);
|
||||
}
|
||||
for ($i = 8; $i < 15; $i++) {
|
||||
$this->setFunctionModule(8, $this->size - 15 + $i, (($bits >> $i) & 1) !== 0);
|
||||
}
|
||||
$this->setFunctionModule(8, $this->size - 8, true);
|
||||
}
|
||||
|
||||
private function drawVersionBits(): void
|
||||
{
|
||||
$rem = $this->version;
|
||||
for ($i = 0; $i < 12; $i++) {
|
||||
$rem = ($rem << 1) ^ ((($rem >> 11) & 1) * 0x1F25);
|
||||
}
|
||||
$bits = ($this->version << 12) | ($rem & 0xFFF);
|
||||
for ($i = 0; $i < 18; $i++) {
|
||||
$bit = (($bits >> $i) & 1) !== 0;
|
||||
$a = $this->size - 11 + ($i % 3);
|
||||
$b = intdiv($i, 3);
|
||||
$this->setFunctionModule($a, $b, $bit);
|
||||
$this->setFunctionModule($b, $a, $bit);
|
||||
}
|
||||
}
|
||||
|
||||
/** @param array<int,int> $codewords */
|
||||
private function drawCodewords(array $codewords, int $mask): void
|
||||
{
|
||||
$bits = [];
|
||||
foreach ($codewords as $byte) {
|
||||
self::appendBits($bits, $byte, 8);
|
||||
}
|
||||
|
||||
$i = 0;
|
||||
$upward = true;
|
||||
for ($right = $this->size - 1; $right >= 1; $right -= 2) {
|
||||
if ($right === 6) {
|
||||
$right = 5;
|
||||
}
|
||||
for ($vert = 0; $vert < $this->size; $vert++) {
|
||||
$y = $upward ? $this->size - 1 - $vert : $vert;
|
||||
for ($j = 0; $j < 2; $j++) {
|
||||
$x = $right - $j;
|
||||
if ($this->isFunction[$y][$x]) {
|
||||
continue;
|
||||
}
|
||||
$bit = $i < count($bits) && $bits[$i] === 1;
|
||||
$i++;
|
||||
if ($this->maskBit($mask, $x, $y)) {
|
||||
$bit = !$bit;
|
||||
}
|
||||
$this->modules[$y][$x] = $bit;
|
||||
}
|
||||
}
|
||||
$upward = !$upward;
|
||||
}
|
||||
}
|
||||
|
||||
private function maskBit(int $mask, int $x, int $y): bool
|
||||
{
|
||||
return match ($mask) {
|
||||
0 => (($x + $y) % 2) === 0,
|
||||
default => false,
|
||||
};
|
||||
}
|
||||
|
||||
private function setFunctionModule(int $x, int $y, bool $dark): void
|
||||
{
|
||||
$this->modules[$y][$x] = $dark;
|
||||
$this->isFunction[$y][$x] = true;
|
||||
}
|
||||
}
|
||||
|
||||
$what = (string)($_GET['what'] ?? '');
|
||||
if ($what === '') {
|
||||
fail(400, 'Missing required query parameter: what');
|
||||
}
|
||||
if (!preg_match('/^[A-Za-z0-9_.-]+$/', $what)) {
|
||||
not_found();
|
||||
}
|
||||
if (!is_readable(DATA_FILE)) {
|
||||
not_found();
|
||||
}
|
||||
|
||||
$config = json_decode((string)file_get_contents(DATA_FILE), true);
|
||||
if (!is_array($config)) {
|
||||
fail(500, 'Invalid what.json');
|
||||
}
|
||||
if (!array_key_exists($what, $config)) {
|
||||
not_found();
|
||||
}
|
||||
|
||||
$entry = qr_entry_to_payload($what, $config[$what]);
|
||||
if ($entry === null) {
|
||||
not_found();
|
||||
}
|
||||
|
||||
$qr = QrCode::fromText($entry['payload']);
|
||||
$title = (string)$entry['title'];
|
||||
$subtitle = (string)$entry['subtitle'];
|
||||
$link = is_string($entry['link']) ? $entry['link'] : null;
|
||||
|
||||
header('Content-Type: text/html; charset=utf-8');
|
||||
?>
|
||||
<!doctype html>
|
||||
<html lang="en">
|
||||
<head>
|
||||
<meta charset="utf-8">
|
||||
<meta name="viewport" content="width=device-width, initial-scale=1">
|
||||
<title><?= h($title) ?> QR</title>
|
||||
<style>
|
||||
:root { color-scheme: light dark; font-family: system-ui, sans-serif; }
|
||||
body { margin: 0; min-height: 100vh; display: grid; place-items: center; background: #f5f5f5; color: #111; }
|
||||
main { width: min(34rem, calc(100vw - 2rem)); text-align: center; padding: 1rem; }
|
||||
.card { background: #fff; border-radius: 1.5rem; box-shadow: 0 1rem 3rem rgb(0 0 0 / 12%); padding: clamp(1.25rem, 5vw, 2.5rem); }
|
||||
h1 { margin: 0 0 .5rem; font-size: clamp(1.75rem, 8vw, 3rem); }
|
||||
p { margin: .5rem 0 1.5rem; overflow-wrap: anywhere; }
|
||||
a { color: inherit; }
|
||||
.qr { margin: auto; max-width: 24rem; }
|
||||
.qr svg { display: block; width: 100%; height: auto; }
|
||||
@media (prefers-color-scheme: dark) {
|
||||
body { background: #111; color: #f5f5f5; }
|
||||
.card { background: #1d1d1d; }
|
||||
}
|
||||
</style>
|
||||
</head>
|
||||
<body>
|
||||
<main>
|
||||
<section class="card">
|
||||
<h1><?= h($title) ?></h1>
|
||||
<p><?php if ($link !== null): ?><a href="<?= h($link) ?>"><?= h($subtitle) ?></a><?php else: ?><?= h($subtitle) ?><?php endif; ?></p>
|
||||
<div class="qr"><?= $qr->toSvg($what) ?></div>
|
||||
</section>
|
||||
</main>
|
||||
</body>
|
||||
</html>
|
||||
15
what.example.json
Normal file
15
what.example.json
Normal file
|
|
@ -0,0 +1,15 @@
|
|||
{
|
||||
"wifi": {
|
||||
"type": "wifi",
|
||||
"label": "Home Wi-Fi",
|
||||
"ssid": "Your WiFi name",
|
||||
"password": "Your WiFi password",
|
||||
"security": "WPA",
|
||||
"hidden": false
|
||||
},
|
||||
"haguest": {
|
||||
"type": "url",
|
||||
"label": "HA Guest",
|
||||
"url": "http://192.168.0.226/haguest"
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Add a link
Reference in a new issue