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 DB;
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use App\{
Follower,
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Profile,
User
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};
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class FollowerService
{
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const CACHE_KEY = 'pf:services:followers:';
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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, $target)
{
RelationshipService::refresh($actor, $target);
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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, $target)
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{
RelationshipService::refresh($actor, $target);
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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, $scope);
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}
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public static function softwareAudience($profile, $software = 'pixelfed')
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{
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return collect(self::audience($profile))
->filter(function($inbox) use($software) {
$domain = parse_url($inbox, PHP_URL_HOST);
if(!$domain) {
return false;
}
return InstanceService::software($domain) === strtolower($software);
})
->unique()
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->values()
->toArray();
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}
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protected function getAudienceInboxes($pid, $scope = null)
{
$key = 'pf:services:follow:audience:' . $pid;
return Cache::remember($key, 86400, function() use($pid) {
$profile = Profile::find($pid);
if(!$profile) {
return [];
}
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return $profile
->followers()
->whereLocalProfile(false)
->get()
->map(function($follow) {
return $follow->sharedInbox ?? $follow->inbox_url;
})
->unique()
->values()
->toArray();
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});
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}
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public static function mutualCount($pid, $mid)
{
return Cache::remember(self::CACHE_KEY . ':mutualcount:' . $pid . ':' . $mid, 3600, function() use($pid, $mid) {
return DB::table('followers as u')
->join('followers as s', 'u.following_id', '=', 's.following_id')
->where('s.profile_id', $mid)
->where('u.profile_id', $pid)
->count();
});
}
public static function mutualIds($pid, $mid, $limit = 3)
{
$key = self::CACHE_KEY . ':mutualids:' . $pid . ':' . $mid . ':limit_' . $limit;
return Cache::remember($key, 3600, function() use($pid, $mid, $limit) {
return DB::table('followers as u')
->join('followers as s', 'u.following_id', '=', 's.following_id')
->where('s.profile_id', $mid)
->where('u.profile_id', $pid)
->limit($limit)
->pluck('s.following_id')
->toArray();
});
}
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}