//! Amazon SNS message types
//!
//! These message types are defined in the [Parsing message formats][0] page of
//! the AWS Documentation.
//!
//! [0]: https://docs.aws.amazon.com/sns/latest/dg/sns-message-and-json-formats.html
use serde::{Deserialize, Serialize};

/// Union for all known SNS message types
///
/// This type can be used to deserialize an arbitrary SNS message into the
/// appropriate type, based on the value of the `Type` field in the JSON
/// document.
#[derive(Deserialize)]
#[serde(tag = "Type")]
pub enum Message {
    SubscriptionConfirmation(SubscriptionConfirmationMessage),
    UnsubscribeConfirmation(UnsubscribeConfirmationMessage),
    Notification(NotificationMessage),
}

/// SNS Subscription confirmation message
///
/// See also: [HTTP/HTTPS subscription confirmation JSON format][0]
///
/// [0]: https://docs.aws.amazon.com/sns/latest/dg/sns-message-and-json-formats.html#http-subscription-confirmation-json
#[derive(Deserialize, Serialize)]
#[serde(rename_all = "PascalCase")]
pub struct SubscriptionConfirmationMessage {
    #[serde(rename = "MessageId")]
    pub message_id: String,
    pub token: String,
    pub topic_arn: String,
    pub message: String,
    #[serde(rename = "SubscribeURL")]
    pub subscribe_url: String,
    pub timestamp: String,
    pub signature_version: String,
    pub signature: String,
    #[serde(rename = "SigningCertURL")]
    pub signing_cert_url: String,
}

/// SNS Notification message
///
/// See also: [HTTP/HTTPS notification JSON format][0]
///
/// [0]: https://docs.aws.amazon.com/sns/latest/dg/sns-message-and-json-formats.html#http-notification-json
#[derive(Deserialize, Serialize)]
#[serde(rename_all = "PascalCase")]
pub struct NotificationMessage {
    #[serde(rename = "MessageId")]
    pub message_id: String,
    pub topic_arn: String,
    pub message: String,
    #[serde(default)]
    pub subject: Option<String>,
    pub timestamp: String,
    pub signature_version: String,
    pub signature: String,
    #[serde(rename = "SigningCertURL")]
    pub signing_cert_url: String,
}

/// SNS Unsubscribe confirmation message
///
/// See also: [HTTP/HTTPS unsubscribe confirmation JSON format][0]
///
/// [0]: https://docs.aws.amazon.com/sns/latest/dg/sns-message-and-json-formats.html#http-unsubscribe-confirmation-json
#[derive(Deserialize, Serialize)]
#[serde(rename_all = "PascalCase")]
pub struct UnsubscribeConfirmationMessage {
    #[serde(rename = "MessageId")]
    pub message_id: String,
    pub token: String,
    pub topic_arn: String,
    pub message: String,
    #[serde(rename = "SubscribeURL")]
    pub subscribe_url: String,
    pub timestamp: String,
    pub signature_version: String,
    pub signature: String,
    #[serde(rename = "SigningCertURL")]
    pub signing_cert_url: String,
}