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114 lines
3.5 KiB
PHP
114 lines
3.5 KiB
PHP
<?php
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/**
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* \file
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* Implement the fetching of Community room icons.
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*/
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require_once 'servers/known-servers.php';
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/**
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* Return local path to room icon.
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* @param string $room_id Id of room to locate icon for.
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*/
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function room_icon_path(string $room_id): string {
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global $ROOM_ICONS_CACHE;
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return "$ROOM_ICONS_CACHE/$room_id";
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}
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/**
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* Return local path to resized room icon.
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* @param string $room_id Id of room to locate icon for.
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* @param string $size Image dimensions.
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*/
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function room_icon_path_resized(string $room_id, string $size): string {
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global $ROOM_ICONS;
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return "$ROOM_ICONS/$room_id-$size";
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}
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/**
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* Return web-facing path to room icon.
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* @param string $room_id Id of room to locate icon for.
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* @param string $size Image dimensions.
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*/
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function room_icon_path_relative(string $room_id, string $size): string {
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global $ROOM_ICONS_RELATIVE;
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return "$ROOM_ICONS_RELATIVE/$room_id-$size";
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}
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/**
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* Fetch the icon of a Community and yield required network requests.
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* @param CommunityRoom $room Community to fetch icon for.
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* @return Generator<int,CurlHandle,CurlHandle|false,void>
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*/
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function fetch_room_icon_coroutine(CommunityRoom $room): Generator {
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$room_id = $room->get_room_identifier();
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$icon_cached = room_icon_path($room_id);
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$icon_expired = file_exists($icon_cached) && filemtime($icon_cached) < strtotime("-1 day");
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// Re-fetch icons periodically.
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if (!file_exists($icon_cached) || $icon_expired) {
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$icon_url = $room->get_icon_url();
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if (empty($icon_url)) {
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return null;
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}
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log_debug("Fetching icon for $room_id.");
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$icon_response = yield from FetchingCoroutine::from_url($icon_url)->run();
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$icon = $icon_response ? curl_multi_getcontent($icon_response) : null;
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if (empty($icon)) {
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log_info("$room_id returned an empty icon.");
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}
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// Never overwrite with an empty file.
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if (!(file_exists($icon_cached) && filesize($icon_cached) > 0 && empty($icon))) {
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file_put_contents($icon_cached, $icon);
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}
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}
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}
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/**
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* Resize a fetched icon of the given room and return its relative path.
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* @param CommunityRoom $room
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* @param string $size Image dimensions.
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* @return string Relative path or null if icon is absent.
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*/
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function room_icon(CommunityRoom $room, string $size): ?string {
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list($width, $height) = explode("x", $size);
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$width = intval($width);
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$height = intval($height);
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assert(!empty($width) && !empty($height));
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if ($room->icon_safety() < 0) {
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return null;
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}
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$room_id = $room->get_room_identifier();
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$icon_cached = room_icon_path($room_id);
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$icon_resized = room_icon_path_resized($room_id, $size);
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$icon_expired = file_exists($icon_cached) && filemtime($icon_cached) < strtotime("-1 day");
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if (!file_exists($icon_cached)) {
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log_debug("Missing icon asset for $room_id");
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return "";
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}
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if (!file_exists($icon_resized) || $icon_expired) {
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$icon_cached_contents = file_get_contents($icon_cached);
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if (empty($icon_cached_contents)) {
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file_put_contents($icon_resized, "");
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return "";
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}
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// Resize image
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$gd_image = imagecreatefromstring($icon_cached_contents);
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$gd_resized = imagescale($gd_image, $width, $height);
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if (!imagewebp($gd_resized, $icon_resized)) {
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log_info("Converting image for $room_id to $size failed");
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}
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}
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if (filesize($icon_resized) == 0) {
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return "";
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}
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return room_icon_path_relative($room_id, $size);
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}
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file_exists($ROOM_ICONS_CACHE) or mkdir($ROOM_ICONS_CACHE, 0755, true);
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file_exists($ROOM_ICONS) or mkdir($ROOM_ICONS, 0755, true);
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?>
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