FR: Start supporting ios 15's interruption-level

[AntonNguyen]

Describe your environment

• Operating System version: All
• Firebase SDK version: v4.7.0
• Firebase Product: FCM

Describe the problem

With the release of iOS 15, they've added a new value to the payload:

• interruption-level

A string that indicates the importance and delivery timing of a notification. The string values “passive”, “active”, “time-sensitive”, or “critical” correspond to the UNNotificationInterruptionLevel enumeration cases.

The FCM library at the moment doesn't support this key.

[hiranya911]

You can always use the CustomData field to add parameters that are not explicitly defined on the type.

aps := &messaging.Aps{
  CustomData: map[string]interface{}{
    "interruption-level": "active",
  }
}

The SDK will serialize the json request correctly.

[AntonNguyen]

You can always use the CustomData field to add parameters that are not explicitly defined on the type.

aps := &messaging.Aps{
  CustomData: map[string]interface{}{
    "interruption-level": "active",
  }
}

The SDK will serialize the json request correctly.

@hiranya911 You're right. That works. Thanks!