pixelfed/notes/DeduplicationChanges.md

# ActivityPub Delivery boilerplate
- `ActivityPubDeliveryService::pool($profile, $audience, $activity);`

replaces

```
        $payload = json_encode($activity);

        $client = new Client([
            'timeout' => config('federation.activitypub.delivery.timeout'),
        ]);

        $version = config('pixelfed.version');
        $appUrl = config('app.url');
        $userAgent = "(Pixelfed/{$version}; +{$appUrl})";

        $requests = function ($audience) use ($client, $activity, $profile, $payload, $userAgent) {
            foreach ($audience as $url) {
                $headers = HttpSignature::sign($profile, $url, $activity, [
                    'Content-Type' => 'application/ld+json; profile="https://www.w3.org/ns/activitystreams"',
                    'User-Agent' => $userAgent,
                ]);
                yield function () use ($client, $url, $headers, $payload) {
                    return $client->postAsync($url, [
                        'curl' => [
                            CURLOPT_HTTPHEADER => $headers,
                            CURLOPT_POSTFIELDS => $payload,
                            CURLOPT_HEADER => true,
                        ],
                    ]);
                };
            }
        };

        $pool = new Pool($client, $requests($audience), [
            'concurrency' => config('federation.activitypub.delivery.concurrency'),
            'fulfilled' => function ($response, $index) {},
            'rejected' => function ($reason, $index) {},
        ]);

        $promise = $pool->promise();

        $promise->wait();
```

# Username validation boilerplate
- `new ValidUsername,`

replaces

```
              function ($attribute, $value, $fail) {
                    $dash = substr_count($value, '-');
                    $underscore = substr_count($value, '_');
                    $period = substr_count($value, '.');

                    if (Str::endsWith($value, ['.php', '.js', '.css'])) {
                        return $fail('Username is invalid.');
                    }

                    if (($dash + $underscore + $period) > 1) {
                        return $fail('Username is invalid. Can only contain one dash (-), period (.) or underscore (_).');
                    }

                    if (! ctype_alnum($value[0])) {
                        return $fail('Username is invalid. Must start with a letter or number.');
                    }

                    if (! ctype_alnum($value[strlen($value) - 1])) {
                        return $fail('Username is invalid. Must end with a letter or number.');
                    }

                    $val = str_replace(['_', '.', '-'], '', $value);
                    if (! ctype_alnum($val)) {
                        return $fail('Username is invalid. Username must be alpha-numeric and may contain dashes (-), periods (.) and underscores (_).');
                    }

                    $restricted = RestrictedNames::get();
                    if (in_array(strtolower($value), array_map('strtolower', $restricted))) {
                        return $fail('Username cannot be used.');
                    }
                },
```

# Notification boilerplate
- `NotificationService::createNotification($recipient->id, $profile->id, 'dm', $dm->id, DirectMessage::class);`
- `NotificationService::firstOrCreateNotification($parent->profile_id, $actor->id, 'share', $parent->id, Status::class);`

replaces

```
            $notification = new Notification;
            $notification->profile_id = $recipient->id;
            $notification->actor_id = $profile->id;
            $notification->action = 'dm';
            $notification->item_id = $dm->id;
            $notification->item_type = DirectMessage::class;
            $notification->save();
```

# fractal boilerplate for items and collection
- `$activity = FractalService::item($follow, new AcceptFollow);`
- `return FractalService::collection($media, new MediaTransformer);`

replaces

```
            $fractal = new Fractal\Manager;
            $fractal->setSerializer(new ArraySerializer);
            $resource = new Fractal\Resource\Item($follow, new AcceptFollow);
            $activity = $fractal->createData($resource)->toArray();
```