Added conditional notifications

- Absolute values
- Percentage threshold

app/Notifications/SpeedtestAbsoluteThresholdNotificationSlack.php

@@ -0,0 +1,86 @@
+<?php
+
+namespace App\Notifications;
+
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Notifications\Messages\MailMessage;
+use Illuminate\Notifications\Messages\SlackMessage;
+use Illuminate\Notifications\Notification;
+
+class SpeedtestAbsoluteThresholdNotificationSlack extends Notification
+{
+    use Queueable;
+
+    protected $errors;
+
+    /**
+     * Create a new notification instance.
+     *
+     * @param array $errors
+     * @return void
+     */
+    public function __construct(array $errors)
+    {
+        $this->errors = $errors;
+    }
+
+    /**
+     * Get the notification's delivery channels.
+     *
+     * @param  mixed  $notifiable
+     * @return array
+     */
+    public function via($notifiable)
+    {
+        return ['slack'];
+    }
+
+    /**
+     * Format slack notification
+     *
+     * @param   mixed   $notifiable
+     * @return  SlackMessage
+     */
+    public function toSlack($notifiable)
+    {
+        return (new SlackMessage)
+                ->warning()
+                ->attachment(function ($attachment) {
+                    $attachment->title('Speedtest absolute threshold error')
+                               ->content($this->formatMessage());
+                });
+    }
+
+    /**
+     * Parse $this->errors and format message
+     *
+     * @return String
+     */
+    public function formatMessage()
+    {
+        $msg = 'For the latest speedtest, the ';
+
+        for($i = 0; $i < sizeof($this->errors); $i++) {
+            $key = $this->errors[$i];
+            $msg = $msg . $key;
+            if(sizeof($this->errors) > 1 && $i < (sizeof($this->errors) - 1)) {
+                $msg = $msg . ', ';
+            }
+        }
+
+        if($msg[-1] != '') {
+            $msg = $msg . ' ';
+        }
+
+        if(sizeof($this->errors) > 1) {
+            $msg = $msg . 'values ';
+        } else {
+            $msg = $msg . 'value ';
+        }
+
+        $msg = $msg . 'exceeded the absolute threshold';
+
+        return $msg;
+    }
+}