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67 lines
2.0 KiB
PHP
67 lines
2.0 KiB
PHP
<?php
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/**
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* \file
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* Implement the fetching of room invite QR codes.
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*/
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/**
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* Return local path to room invite code.
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* @param string $room_id Id of room to locate QR code for.
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*/
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function room_qr_code_path(string $room_id): string {
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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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* Return server-relative path to room invite code.
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* @param string $room_id Id of room to locate QR code for.
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*/
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function room_qr_code_path_relative(string $room_id): string {
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global $QR_CODES_RELATIVE;
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return "$QR_CODES_RELATIVE/$room_id.png";
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}
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/**
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* Fetches the QR code for the given Community, yielding required network requests.
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* @param CommunityRoom $room Community to fetch QR code for
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* @return Generator<int,CurlHandle,CurlHandle|false,void>
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*/
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function fetch_qr_code_coroutine(CommunityRoom $room): Generator {
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$room_id = $room->get_room_identifier();
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$png_cached = room_qr_code_path($room_id);
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$image_expired = file_exists($png_cached) &&
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filemtime($png_cached) < strtotime("-12 hour");
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if (file_exists($png_cached) && !$image_expired) {
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return room_qr_code_path_relative($room_id);
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}
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log_debug("Fetching QR code for $room_id.");
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$png_response = yield from FetchingCoroutine::from_url($room->get_invite_url())->run();
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$png = $png_response ? curl_multi_getcontent($png_response) : null;
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if (empty($png)) {
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log_warning("$room_id returned an empty QR code.");
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}
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// Never overwrite with an empty file.
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if (!(file_exists($png_cached) && filesize($png_cached) > 0 && empty($png))) {
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file_put_contents($png_cached, $png);
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}
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}
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/**
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* Fetch QR invite of the given room and return its relative path.
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* @param CommunityRoom $room
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* @return string
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*/
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function room_qr_code(CommunityRoom $room): string {
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$room_id = $room->get_room_identifier();
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if (!file_exists(room_qr_code_path($room_id))) {
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log_warning("Missing QR code asset for $room_id.");
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return "";
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}
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return room_qr_code_path_relative($room_id);
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}
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file_exists($QR_CODES) or mkdir($QR_CODES, 0755);
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?>
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