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//! Settle message type for the Transaction Authorization Protocol.
//!
//! This module defines the Settle message type, which is used
//! for settling transactions in the TAP protocol.
use crate::error::{Error, Result};
use crate::TapMessage;
use serde::{Deserialize, Serialize};
/// Settle message body (TAIP-4).
#[derive(Debug, Clone, Serialize, Deserialize, TapMessage)]
#[tap(message_type = "https://tap.rsvp/schema/1.0#Settle", custom_validation)]
pub struct Settle {
/// ID of the transaction being settled.
#[tap(thread_id)]
pub transaction_id: String,
/// Settlement ID (CAIP-220 identifier of the underlying settlement transaction).
#[serde(
rename = "settlementId",
skip_serializing_if = "Option::is_none",
default
)]
pub settlement_id: Option<String>,
/// Optional amount settled. If specified, must be less than or equal to the original amount.
#[serde(skip_serializing_if = "Option::is_none")]
pub amount: Option<String>,
}
impl Settle {
/// Create a new Settle message
pub fn new(transaction_id: &str, settlement_id: &str) -> Self {
Self {
transaction_id: transaction_id.to_string(),
settlement_id: Some(settlement_id.to_string()),
amount: None,
}
}
/// Create a new Settle message with an amount
pub fn with_amount(transaction_id: &str, settlement_id: &str, amount: &str) -> Self {
Self {
transaction_id: transaction_id.to_string(),
settlement_id: Some(settlement_id.to_string()),
amount: Some(amount.to_string()),
}
}
/// Create a minimal Settle message (for testing/special cases)
pub fn minimal(transaction_id: &str) -> Self {
Self {
transaction_id: transaction_id.to_string(),
settlement_id: None,
amount: None,
}
}
}
impl Settle {
/// Custom validation for Settle messages
pub fn validate_settle(&self) -> Result<()> {
if self.transaction_id.is_empty() {
return Err(Error::Validation(
"Transaction ID is required in Settle".to_string(),
));
}
// Note: settlement_id is now optional to support minimal test cases
// In production use, settlement_id should typically be provided
if let Some(ref settlement_id) = self.settlement_id {
if settlement_id.is_empty() {
return Err(Error::Validation(
"Settlement ID cannot be empty when provided".to_string(),
));
}
// Validate CAIP-220 format: namespace:chain_id:tx_type/tx_hash
// Example: eip155:1:tx/0x3edb98c24d46d148eb926c714f4fbaa117c47b0c0821f38bfce9763604457c33
// First check if it starts with 0x (common mistake - raw hex without CAIP format)
if settlement_id.starts_with("0x") && !settlement_id.contains(':') {
return Err(Error::Validation(
"Invalid format for 'settlementId', CAIP-220 block address expected"
.to_string(),
));
}
let parts: Vec<&str> = settlement_id.split(':').collect();
if parts.len() < 3 {
return Err(Error::Validation(
"Invalid format for 'settlementId', CAIP-220 block address expected"
.to_string(),
));
}
// Check if the third part contains tx_type/tx_hash
if let Some(tx_part) = parts.get(2) {
if !tx_part.contains('/') {
return Err(Error::Validation(
"Invalid format for 'settlementId', CAIP-220 block address expected"
.to_string(),
));
}
}
}
if let Some(amount) = &self.amount {
if amount.is_empty() {
return Err(Error::Validation(
"Amount must be a valid number".to_string(),
));
}
// Validate amount is a finite positive number if provided
match amount.parse::<f64>() {
Ok(amount) if !amount.is_finite() => {
return Err(Error::Validation(
"Amount must be a finite number".to_string(),
));
}
Ok(amount) if amount <= 0.0 => {
return Err(Error::Validation("Amount must be positive".to_string()));
}
Err(_) => {
return Err(Error::Validation(
"Amount must be a valid number".to_string(),
));
}
_ => {}
}
}
Ok(())
}
}