pixelfed/app/Services/FollowerService.php

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<?php
namespace App\Services;
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use Illuminate\Support\Facades\Redis;
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use Cache;
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use App\{
Follower,
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Profile,
User
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};
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class FollowerService
{
const FOLLOWING_KEY = 'pf:services:follow:following:id:';
const FOLLOWERS_KEY = 'pf:services:follow:followers:id:';
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public static function add($actor, $target)
{
Redis::zadd(self::FOLLOWING_KEY . $actor, $target, $target);
Redis::zadd(self::FOLLOWERS_KEY . $target, $actor, $actor);
}
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public static function remove($actor, $target)
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{
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Redis::zrem(self::FOLLOWING_KEY . $actor, $target);
Redis::zrem(self::FOLLOWERS_KEY . $target, $actor);
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Cache::forget('pf:services:follow:audience:' . $actor);
Cache::forget('pf:services:follow:audience:' . $target);
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}
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public static function followers($id, $start = 0, $stop = 10)
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{
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return Redis::zrange(self::FOLLOWERS_KEY . $id, $start, $stop);
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}
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public static function following($id, $start = 0, $stop = 10)
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{
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return Redis::zrange(self::FOLLOWING_KEY . $id, $start, $stop);
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}
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public static function follows(string $actor, string $target)
{
return Follower::whereProfileId($actor)->whereFollowingId($target)->exists();
}
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public static function audience($profile, $scope = null)
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{
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return (new self)->getAudienceInboxes($profile);
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}
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protected function getAudienceInboxes($profile, $scope = null)
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{
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if(!$profile instanceOf Profile) {
return [];
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}
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$key = 'pf:services:follow:audience:' . $profile->id;
return Cache::remember($key, 86400, function() use($profile) {
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return $profile
->followers()
->whereLocalProfile(false)
->get()
->map(function($follow) {
return $follow->sharedInbox ?? $follow->inbox_url;
})
->unique()
->values()
->toArray();
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});
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}
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}