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45 lines
1.3 KiB
PHP
45 lines
1.3 KiB
PHP
<?php
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function room_qr_code_cached($room_id) {
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global $QR_CODES;
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return "$QR_CODES/$room_id.png";
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}
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/*
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* Use Google API to generate QR codes and encode them as base64
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*/
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function base64_qr_code($room_id, $join_url, $size = "512x512") {
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// Could use http_build_query() instead, but I won't break what works.
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// https://developers.google.com/chart/infographics/docs/qr_codes
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$png_cached = room_qr_code_cached($room_id);
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if (file_exists($png_cached))
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return base64_encode(file_get_contents($png_cached));
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$data = urlencode($join_url);
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$api_url =
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"https://chart.googleapis.com/chart?cht=qr" .
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"&chs=$size" .
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"&chl=$data" .
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"&chld=L|0";
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// error correction level: L = 7%, M = 15%, Q = 25%, H = 30%
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// | margin in number of rows
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$png = file_get_contents($api_url);
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file_put_contents($png_cached, $png);
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return base64_encode($png);
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}
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file_exists($QR_CODES) or mkdir($QR_CODES, 700);
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?>
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<?php foreach ($rooms as $id => $room): ?>
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<div id="modal_<?=$id?>" class="qr-code-modal">
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<div class="qr-code-modal-content">
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<span class="qr-code-modal-close" onclick='hideQRModal("<?=$id?>")'>
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×
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</span>
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<img
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src="data:image/png;base64,<?=base64_qr_code($id, $room->join_link)?>"
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alt="Community join link encoded as QR code"
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class="qr-code"
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>
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</div>
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</div>
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<?php endforeach; ?>
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