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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace NotificationChannels\WebPush;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                trait HasPushSubscriptions  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Get the user's subscriptions.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return \Illuminate\Database\Eloquent\Relations\HasMany  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function pushSubscriptions()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->hasMany(PushSubscription::class);  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Update (or create) user subscription.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  string $endpoint  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  string|null $key  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  string|null $token  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return \NotificationChannels\WebPush\PushSubscription  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function updatePushSubscription($endpoint, $key = null, $token = null)  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $subscription = PushSubscription::findByEndpoint($endpoint);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if ($subscription && $this->pushSubscriptionBelongsToUser($subscription)) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $subscription->public_key = $key;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $subscription->auth_token = $token;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $subscription->save();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            return $subscription;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if ($subscription && ! $this->pushSubscriptionBelongsToUser($subscription)) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $subscription->delete();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return $this->pushSubscriptions()->save(new PushSubscription([  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            'endpoint' => $endpoint,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            'public_key' => $key,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            'auth_token' => $token,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        ]));  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Determine if the given subscription belongs to this user.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  \NotificationChannels\WebPush\PushSubscription $subscription  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return bool  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function pushSubscriptionBelongsToUser($subscription)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return (int) $subscription->user_id === (int) $this->getAuthIdentifier();  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Delete subscription by endpoint.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param  string $endpoint  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return void  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function deletePushSubscription($endpoint)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->pushSubscriptions()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->where('endpoint', $endpoint) | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ->delete();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Get all subscriptions.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return \Illuminate\Database\Eloquent\Collection  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function routeNotificationForWebPush()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $this->pushSubscriptions;  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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This check looks for methods that are used by a trait but not required by it.
To illustrate, let’s look at the following code example
The trait
Idableprovides a methodequalsIdthat in turn relies on the methodgetId(). If this method does not exist on a class mixing in this trait, the method will fail.Adding the
getId()as an abstract method to the trait will make sure it is available.