feat/Implement booking contract for managing reservations by ussyalfaks · Pull Request #58 · Stellar-Rent/stellar-rent

ussyalfaks · 2025-05-30T23:17:30Z

Pull Request | StellarRent

📋 Summary

This PR introduces the Application Binary Interface (ABI) for the BookingContract, a critical component of the StellarRent decentralized property rental platform. The ABI provides a standardized interface for frontend applications and other smart contracts to interact with the booking functionality on the Stellar blockchain using Soroban.

Close #45

🎯 Motivation

The booking contract needed a properly structured ABI to:

Enable seamless integration between the smart contract and frontend applications
Provide type safety for contract interactions
Document the contract interface for developers
Facilitate automated SDK generation for various programming languages

🔧 Changes Made

New Files

apps/stellar-contracts/booking_abi.json - Complete ABI specification for the BookingContract

ABI Structure

The ABI includes comprehensive definitions for:

📌 Functions (8 total)

Function	Purpose	Key Parameters
`initialize`	Set up the contract	None
`check_availability`	Verify property availability	property_id, start_date, end_date
`create_booking`	Create new reservation	property_id, user_id, dates, price
`cancel_booking`	Cancel existing booking	booking_id, user_id
`get_booking`	Retrieve booking details	booking_id
`update_status`	Modify booking status	booking_id, new_status, caller
`get_property_bookings`	List property bookings	property_id
`set_escrow_id`	Link escrow transaction	booking_id, escrow_id

📊 Data Types

BookingStatus Enum:

enum BookingStatus {
  Pending,
  Confirmed,
  Completed,
  Cancelled
}

Booking Struct:

struct Booking {
  id: u64                    // Unique booking identifier
  property_id: String        // Reference to property
  user_id: String           // Guest identifier
  start_date: u64           // Check-in timestamp
  end_date: u64             // Check-out timestamp
  total_price: i128         // Price in USDC
  status: BookingStatus     // Current booking state
  escrow_id: Option<String> // Optional escrow reference
}

⚠️ Error Types

InvalidDates - Date validation failures
InvalidPrice - Pricing errors
BookingOverlap - Double booking prevention
Unauthorized - Permission violations
InvalidStatus - Invalid status transitions
BookingNotFound - Missing booking errors

🌟 Key Features

1. Availability Management

Real-time availability checking
Overlap detection to prevent double bookings
Date validation ensuring logical booking periods

2. Booking Lifecycle

Complete state management from creation to completion
Status transitions with validation rules
Integration points for escrow services

3. Security & Authorization

User authentication for booking modifications
Owner-only cancellation rights
Secure escrow integration points

📚 Usage Example

// Check availability
const isAvailable = await contract.check_availability({
  property_id: "PROP123",
  start_date: 1704067200,
  end_date: 1704153600
});

// Create booking
const bookingId = await contract.create_booking({
  property_id: "PROP123",
  user_id: "USER456",
  start_date: 1704067200,
  end_date: 1704153600,
  total_price: 1000000000 // 100 USDC
});

🧪 Testing Considerations

The ABI supports comprehensive testing scenarios:

✅ Availability conflict detection
✅ Date validation edge cases
✅ Status transition workflows
✅ Authorization verification
✅ Escrow integration points

🔗 Integration Points

This ABI enables integration with:

Frontend: Next.js application for user interactions
Backend: Node.js/Express API for business logic
Escrow: Trustless Work for secure payments
Database: Supabase for metadata storage

📖 Documentation

Comprehensive documentation available at:

Contract Overview: apps/stellar-contracts/contracts/booking/CONTRACT_OVERVIEW.md
Stellar Expert: Contract Explorer

🚀 Deployment Information

Network: Stellar Testnet
Contract ID: CB3ILSDNHL6TWZYZJAS4L27GLHNAGW4ISW6YXIBHGHL4QYI4JPLP6W3E
ABI Path: apps/stellar-contracts/booking_abi.json

✅ Checklist

ABI follows Soroban standards
All contract functions documented
Error types clearly defined
Data structures properly typed
Integration examples provided
Contract ID and network specified

Building the future of decentralized property rentals on Stellar! 🏠✨

Summary by CodeRabbit

New Features
- Introduced a blockchain-based booking system for property reservations, enabling users to check availability, create, cancel, and manage bookings, as well as integrate escrow payments.
- Added support for tracking booking status (Pending, Confirmed, Completed, Cancelled) and detailed booking information.
Documentation
- Added comprehensive user and developer documentation outlining contract functionality, workflows, security considerations, and integration guidance.
Tests
- Implemented extensive automated tests covering booking creation, availability checks, overlap prevention, cancellations, status updates, and error handling.
- Included test snapshots to validate contract behavior and ledger state across key scenarios.
Chores
- Added configuration files and build scripts to streamline development, testing, and deployment workflows.

coderabbitai · 2025-05-30T23:17:38Z

Walkthrough

This change introduces a new BookingContract smart contract for the Stellar blockchain (Soroban) to manage property reservations. It includes contract logic, ABI, documentation, configuration, a Makefile, comprehensive unit tests, and a suite of test ledger snapshots. The contract supports booking creation, availability checks, overlap prevention, status management, escrow integration, and cancellation.

Changes

File(s)	Change Summary
`apps/stellar-contracts/booking_abi.json`	Added ABI JSON for BookingContract with functions, types, and errors.
`apps/stellar-contracts/contracts/booking/CONTRACT_OVERVIEW.md`	Added detailed contract overview and documentation.
`apps/stellar-contracts/contracts/booking/Cargo.toml`	Added Rust package configuration for the booking contract.
`apps/stellar-contracts/contracts/booking/Makefile`	Added Makefile for building, testing, formatting, and cleaning the contract.
`apps/stellar-contracts/contracts/booking/src/lib.rs`	Implemented BookingContract logic, data structures, and public methods.
`apps/stellar-contracts/contracts/booking/src/test.rs`	Added comprehensive unit tests for BookingContract functionality and error handling.
`apps/stellar-contracts/contracts/booking/test_snapshots/test/*.json`	Added test ledger state snapshots for various booking scenarios (creation, overlap, cancellation, etc.).

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant BookingContract
    participant EscrowContract

    User->>BookingContract: check_availability(property_id, start_date, end_date)
    BookingContract-->>User: availability (bool)

    User->>BookingContract: create_booking(property_id, user_id, start_date, end_date, total_price)
    BookingContract->>BookingContract: validate dates, check overlap
    BookingContract->>EscrowContract: initiate escrow (escrow_id)
    BookingContract-->>User: booking_id

    User->>BookingContract: cancel_booking(booking_id, user_id)
    BookingContract->>EscrowContract: trigger refund (if applicable)
    BookingContract-->>User: cancellation status

    User->>BookingContract: get_booking(booking_id)
    BookingContract-->>User: Booking details

    User->>BookingContract: update_status(booking_id, new_status, caller)
    BookingContract-->>User: updated Booking

Assessment against linked issues

Objective (Issue #)	Addressed	Explanation
Contract overview documentation present (#45)	✅
BookingContract implements: check_availability, create_booking, cancel_booking, unique ID, overlap prevention (#45)	✅
Booking struct and storage mappings, proper data structures (#45)	✅
Escrow integration included in booking creation and cancellation logic (#45)	✅
Comprehensive tests: creation, overlap, cancellation, edge cases, escrow (mocked) (#45)	✅

Poem

In the blockchain burrow, a contract was spun,
For bookings and stays, and double-booking—none!
With tests that all pass and docs clear as day,
Escrow and dates keep trouble at bay.
A rabbit’s delight—reservations done right!
🐇✨

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📥 Commits

Reviewing files that changed from the base of the PR and between f7a7825 and f6f76ac.

📒 Files selected for processing (2)

apps/stellar-contracts/contracts/booking/src/lib.rs (1 hunks)
apps/stellar-contracts/contracts/booking/src/test.rs (1 hunks)

🚧 Files skipped from review as they are similar to previous changes (2)

apps/stellar-contracts/contracts/booking/src/test.rs
apps/stellar-contracts/contracts/booking/src/lib.rs

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coderabbitai

Actionable comments posted: 6

♻️ Duplicate comments (2)

apps/stellar-contracts/contracts/booking/test_snapshots/test/test_invalid_price.1.json (1)

21-105: Storage keys match initial state
Snapshot only populates BOOKCOUNT, contract instance, and code—no bookings exist prior to InvalidPrice validation.

apps/stellar-contracts/contracts/booking/test_snapshots/test/test_booking_overlap_prevention.1.json (1)

6-11: Auth array length consistency
Matches the non-overlapping snapshot—ensure this count corresponds to the number of distinct contract calls recorded before snapshotting.

🧹 Nitpick comments (8)

apps/stellar-contracts/contracts/booking/Cargo.toml (2)

1-6: Consider enriching crate metadata
The package section currently contains minimal fields. Adding description, license, and authors (even if unpublished) will improve clarity and future maintainability.

27-29: Custom profile for logging
The release-with-logs profile enables debug assertions. Consider whether additional logging features from the SDK should be toggled here, or if this profile needs further customization.

apps/stellar-contracts/contracts/booking/CONTRACT_OVERVIEW.md (1)

1-305: Comprehensive and well-structured documentation!

The documentation provides excellent coverage of the contract's functionality, integration patterns, and usage examples. The CLI examples are particularly helpful for understanding contract interactions.

Consider addressing these minor improvements:

Fix the markdown formatting issues flagged by static analysis (loose punctuation marks)

Ensure error types mentioned in documentation match those defined in the ABI (e.g., "PropertyNotFound" vs actual ABI errors)

Consider using the bare URL formatting for the contract link on line 11 as suggested by markdownlint

🧰 Tools

🪛 LanguageTool

[uncategorized] ~73-~73: Loose punctuation mark.
Context: ... \ --end_date 1704153600 ``` - PROP1: Property ID to check. - `1704067200`: S...

(UNLIKELY_OPENING_PUNCTUATION)

[uncategorized] ~74-~74: Loose punctuation mark.
Context: ...1: Property ID to check. - 1704067200`: Start date (Unix timestamp - Jan 1, 202...

(UNLIKELY_OPENING_PUNCTUATION)

[uncategorized] ~75-~75: Loose punctuation mark.
Context: ...timestamp - Jan 1, 2024). - 1704153600: End date (Unix timestamp - Jan 2, 2024)...

(UNLIKELY_OPENING_PUNCTUATION)

[uncategorized] ~99-~99: Loose punctuation mark.
Context: ... --total_price 1000000000 ``` - PROP1: Property being booked. - `USER123`: Use...

(UNLIKELY_OPENING_PUNCTUATION)

[uncategorized] ~100-~100: Loose punctuation mark.
Context: ...OP1: Property being booked. - USER123: User making the booking. - 1704067200`...

(UNLIKELY_OPENING_PUNCTUATION)

[uncategorized] ~101-~101: Loose punctuation mark.
Context: ... User making the booking. - 1704067200: Check-in date. - 1704153600: Check-ou...

(UNLIKELY_OPENING_PUNCTUATION)

[uncategorized] ~102-~102: Loose punctuation mark.
Context: ...04067200: Check-in date. - 1704153600: Check-out date. - 1000000000`: Total p...

(UNLIKELY_OPENING_PUNCTUATION)

[uncategorized] ~103-~103: Loose punctuation mark.
Context: ...4153600: Check-out date. - 1000000000`: Total price in USDC (100 USDC with 7 de...

(UNLIKELY_OPENING_PUNCTUATION)

[uncategorized] ~124-~124: Loose punctuation mark.
Context: ...23 \ --user_id USER123 ``` - BOOK123: Booking ID to cancel. - `USER123`: User...

(UNLIKELY_OPENING_PUNCTUATION)

[uncategorized] ~125-~125: Loose punctuation mark.
Context: ...K123: Booking ID to cancel. - USER123`: User requesting cancellation (must matc...

(UNLIKELY_OPENING_PUNCTUATION)

[style] ~166-~166: To form a complete sentence, be sure to include a subject.
Context: ...ler <HOST_ADDRESS> ``` - --new_status can be `Pending`, `Confirmed`, `Completed`,...

(MISSING_IT_THERE)

[uncategorized] ~246-~246: Loose punctuation mark.
Context: ...h existing reservation. - InvalidDates: Start date is after end date or dates a...

(UNLIKELY_OPENING_PUNCTUATION)

[uncategorized] ~247-~247: Loose punctuation mark.
Context: ...es are in the past. - PropertyNotFound: Referenced property doesn't exist. - `U...

(UNLIKELY_OPENING_PUNCTUATION)

[uncategorized] ~248-~248: Loose punctuation mark.
Context: ...ty doesn't exist. - UnauthorizedAction: User attempting action they don't have ...

(UNLIKELY_OPENING_PUNCTUATION)

[uncategorized] ~249-~249: Loose punctuation mark.
Context: ...'t have permission for. - InvalidPrice: Negative or zero price provided. - `Boo...

(UNLIKELY_OPENING_PUNCTUATION)

[uncategorized] ~250-~250: Loose punctuation mark.
Context: ...zero price provided. - BookingNotFound: Referenced booking ID doesn't exist. - ...

(UNLIKELY_OPENING_PUNCTUATION)

[uncategorized] ~251-~251: Loose punctuation mark.
Context: ...king ID doesn't exist. - InvalidStatus: Attempted invalid status transition. -...

(UNLIKELY_OPENING_PUNCTUATION)

[style] ~261-~261: Three successive sentences begin with the same word. Consider rewording the sentence or use a thesaurus to find a synonym.
Context: ...selects check-in/check-out dates. 2. Guest creates booking: - Backend verifie...

(ENGLISH_WORD_REPEAT_BEGINNING_RULE)

🪛 markdownlint-cli2 (0.17.2)

11-11: Bare URL used
null

(MD034, no-bare-urls)
apps/stellar-contracts/contracts/booking/src/lib.rs (5)
18-29: Consider using Address type for user identification.

While the Booking struct is well-designed, consider using Address instead of String for user_id to leverage Soroban's built-in authentication and ensure type safety.
pub struct Booking {
    pub id: u64,
    pub property_id: String,
-   pub user_id: String,
+   pub user_id: Address,
    pub start_date: u64,
    pub end_date: u64,
    pub total_price: i128,
    pub status: BookingStatus,
    pub escrow_id: Option<String>,
}
53-71: Optimize availability check with early validation.

The availability logic is correct, but consider validating the current timestamp to prevent checking availability for past dates.
pub fn check_availability(
    env: Env,
    property_id: String,
    start_date: u64,
    end_date: u64,
) -> bool {
    // Validate dates
    if start_date >= end_date {
        return false;
    }
+   
+   // Check if start date is in the past
+   let current_time = env.ledger().timestamp();
+   if start_date < current_time {
+       return false;
+   }

    // Get all bookings for this property
    let bookings = Self::get_property_bookings_internal(&env, property_id.clone());
    
    // Check for overlaps
    for booking in bookings.iter() {
        if booking.status != BookingStatus::Cancelled {
            // Check if dates overlap
            if !(end_date <= booking.start_date || start_date >= booking.end_date) {
                return false;
            }
        }
    }
    
    true
}
242-243: Implement proper authorization for update_status.

The TODO comment indicates incomplete authorization. This function should verify that only authorized entities (property owners, system administrators) can update booking status.

The current authorization is incomplete. Would you like me to help implement proper role-based authorization for status updates?
pub fn update_status(
    env: Env,
    booking_id: u64,
    new_status: BookingStatus,
    caller: Address,
) -> Booking {
-   // TODO: Add proper authorization check for host/system
    caller.require_auth();
+   
+   // Verify caller is authorized (property owner, system admin, etc.)
+   // This requires additional contract design for role management
143-145: Document escrow integration requirements.

The TODO comments indicate incomplete escrow integration. Consider documenting the expected escrow contract interface and integration points.

Would you like me to help design the escrow integration interface or create documentation for the required escrow contract interactions?

258-268: Consider adding state transition validation for business rules.

While the basic state transitions are correct, consider adding business rule validation (e.g., time-based restrictions for cancellations).
match (booking.status, new_status) {
    (BookingStatus::Pending, BookingStatus::Confirmed) |
    (BookingStatus::Confirmed, BookingStatus::Completed) |
    (BookingStatus::Pending, BookingStatus::Cancelled) |
    (BookingStatus::Confirmed, BookingStatus::Cancelled) => {
+       // Add time-based validation for cancellations
+       if new_status == BookingStatus::Cancelled {
+           let current_time = env.ledger().timestamp();
+           // Example: prevent cancellation within 24 hours of start
+           if booking.start_date.saturating_sub(current_time) < 86400 {
+               panic!("Cannot cancel booking within 24 hours of start date");
+           }
+       }
        booking.status = new_status;
        bookings_map.set(i, (id.clone(), booking.clone()));
        updated_booking = Some(booking.clone());
        booking_found = true;
    }
    _ => panic!("Invalid status transition"),
}

📜 Review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 877e6d9 and f7a7825.

⛔ Files ignored due to path filters (1)

apps/stellar-contracts/Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (20)

apps/stellar-contracts/booking_abi.json (1 hunks)
apps/stellar-contracts/contracts/booking/CONTRACT_OVERVIEW.md (1 hunks)
apps/stellar-contracts/contracts/booking/Cargo.toml (1 hunks)
apps/stellar-contracts/contracts/booking/Makefile (1 hunks)
apps/stellar-contracts/contracts/booking/src/lib.rs (1 hunks)
apps/stellar-contracts/contracts/booking/src/test.rs (1 hunks)
apps/stellar-contracts/contracts/booking/test_snapshots/test/test_booking_not_found.1.json (1 hunks)
apps/stellar-contracts/contracts/booking/test_snapshots/test/test_booking_overlap_prevention.1.json (1 hunks)
apps/stellar-contracts/contracts/booking/test_snapshots/test/test_cancel_booking_success.1.json (1 hunks)
apps/stellar-contracts/contracts/booking/test_snapshots/test/test_cancel_booking_unauthorized.1.json (1 hunks)
apps/stellar-contracts/contracts/booking/test_snapshots/test/test_check_availability_empty.1.json (1 hunks)
apps/stellar-contracts/contracts/booking/test_snapshots/test/test_create_booking_success.1.json (1 hunks)
apps/stellar-contracts/contracts/booking/test_snapshots/test/test_get_property_bookings.1.json (1 hunks)
apps/stellar-contracts/contracts/booking/test_snapshots/test/test_initialize.1.json (1 hunks)
apps/stellar-contracts/contracts/booking/test_snapshots/test/test_invalid_dates.1.json (1 hunks)
apps/stellar-contracts/contracts/booking/test_snapshots/test/test_invalid_price.1.json (1 hunks)
apps/stellar-contracts/contracts/booking/test_snapshots/test/test_invalid_status_transition.1.json (1 hunks)
apps/stellar-contracts/contracts/booking/test_snapshots/test/test_non_overlapping_bookings.1.json (1 hunks)
apps/stellar-contracts/contracts/booking/test_snapshots/test/test_set_escrow_id.1.json (1 hunks)
apps/stellar-contracts/contracts/booking/test_snapshots/test/test_update_status.1.json (1 hunks)

🧰 Additional context used

🪛 LanguageTool

apps/stellar-contracts/contracts/booking/CONTRACT_OVERVIEW.md

[uncategorized] ~73-~73: Loose punctuation mark.
Context: ... \ --end_date 1704153600 ``` - PROP1: Property ID to check. - `1704067200`: S...