Token Renewal System Implementation

Issue Reference

Closes #421

Overview

Implementation of the Token Renewal System for ManageHub membership tokens, including automatic renewal options, grace periods for expired tokens, and comprehensive renewal tracking.

Status: ✅ Complete and Tested (51/51 tests passing)

Files Modified

1. ✅ contracts/manage_hub/src/membership_token.rs - Renewal functions and logic
2. ✅ contracts/manage_hub/src/lib.rs - Renewal contract endpoints
3. ✅ contracts/manage_hub/src/types.rs - Renewal data structures
4. ✅ contracts/manage_hub/src/errors.rs - Renewal-specific errors
5. ✅ contracts/common_types/src/types.rs - Grace period status enum
6. ✅ contracts/manage_hub/src/subscription.rs - Made USDC getter public
7. ✅ contracts/manage_hub/src/test.rs - Comprehensive test suite (15 new tests)

Acceptance Criteria Implemented

✅ 1. Add renew_token function to membership contract

• Implemented renew_token() function with tier-based pricing integration
• Validates renewals are enabled via configuration
• Fetches tier pricing dynamically (Monthly/Annual billing cycles)
• Validates payment token (USDC requirement)
• Smart expiry extension: extends from current expiry if active, from current time if expired
• Clears grace period fields on successful renewal
• Tracks renewal attempts counter
• Records renewal in history
• Emits token_rnw event with payment details

✅ 2. Implement grace period for expired tokens (configurable, default 7 days)

• Implemented check_and_apply_grace_period() function
• Automatically transitions expired Active tokens to GracePeriod status
• Configurable grace period duration (default: 7 days / 604,800 seconds)
• Sets grace period entry and expiry timestamps
• Added GracePeriod variant to MembershipStatus enum
• Tokens remain usable during grace period but transfers are blocked
• Modified transfer_token() to prevent transfers during grace period
• Emits grace_in event when entering grace period
• Returns GracePeriodExpired error if period has lapsed

✅ 3. Add automatic renewal configuration and checking

• Implemented set_renewal_config() (admin-only) and get_renewal_config() functions
• Created RenewalConfig struct with configurable settings:
  • Grace period duration (default: 7 days)
  • Auto-renewal notice period (default: 1 day)
  • Renewals enabled flag
• Implemented check_auto_renewal_eligibility() function
• Checks if token is within renewal window (1 day before expiry by default)
• Created AutoRenewalSettings struct for user preferences
• Implemented set_auto_renewal() and get_auto_renewal_settings() for user control
• Emits rnw_cfg event on configuration updates

✅ 4. Include payment validation for renewals with configurable fees

• Integrated with existing subscription module tier pricing system
• Dynamically fetches tier pricing at renewal time
• Validates payment token matches USDC contract address
• Validates payment amount is positive
• Supports Monthly and Annual billing cycles with different pricing
• Monthly: 30 days extension
• Annual: 365 days extension
• Follows existing payment validation pattern from subscription module

✅ 5. Add renewal history tracking

• Implemented record_renewal() internal function
• Created RenewalHistory struct tracking:
  • Timestamp, tier ID, amount, payment token
  • Success/failure status
  • Trigger reason (Manual/AutoRenewal/GracePeriod)
  • Old and new expiry dates
  • Error messages on failure
• Created RenewalTrigger enum for tracking renewal source
• Implemented get_renewal_history() function for retrieval
• History stored per-token in persistent storage with TTL extension

✅ 6. Update tests for renewal scenarios including edge cases

Implemented 15 comprehensive test cases:

• Configuration management tests
• Successful renewal with tier pricing
• Error handling (tier not found, grace period expired)
• Grace period functionality and transfer restrictions
• Renewal history tracking with multiple renewals
• Auto-renewal settings persistence
• Auto-renewal eligibility window detection
• Smart expiry extension (before vs after expiry scenarios)
• Grace period clearing on successful renewal

All 51 tests passing successfully

✅ 7. Add renewal eligibility checking functions

• Implemented check_auto_renewal_eligibility() function
• Checks three conditions:
  1. Current time ≥ (expiry_date - auto_renewal_notice_days)
  2. Current time < expiry_date
  3. Token status == Active
• Used by external services to identify tokens ready for auto-renewal
• Used internally by process_auto_renewal() before processing

✅ 8. Implement renewal notification events

Implemented 6 event types:

1. rnw_cfg - Renewal configuration updated
2. token_rnw - Token successfully renewed
3. grace_in - Grace period entered
4. grace_ar - Grace period entered due to auto-renewal failure
5. auto_ok - Auto-renewal successful
6. auto_rnw - Auto-renewal settings updated

All events include relevant data (amounts, timestamps, status changes)

Key Implementation Details

Data Structures Added

• Extended MembershipToken with 5 new fields (tier_id, grace period tracking, renewal attempts)
• Added 3 new storage keys (RenewalConfig, RenewalHistory, AutoRenewalSettings)
• Created RenewalConfig, RenewalHistory, AutoRenewalSettings, and RenewalTrigger types

Core Functions Implemented

• renew_token() - Manual renewal with payment
• set_renewal_config() / get_renewal_config() - Configuration management
• check_and_apply_grace_period() - Grace period handling
• set_auto_renewal() / get_auto_renewal_settings() - Auto-renewal preferences
• check_auto_renewal_eligibility() - Eligibility checking
• process_auto_renewal() - Automatic renewal processing
• get_renewal_history() - History retrieval
• record_renewal() - Internal history recording

Error Codes Added

• RenewalNotAllowed (Error 46) - Renewals disabled or conditions not met
• TransferNotAllowedInGracePeriod (Error 47) - Cannot transfer during grace period
• GracePeriodExpired (Error 48) - Grace period has lapsed
• AutoRenewalFailed (Error 49) - Auto-renewal attempt failed

Design Patterns

• Smart Expiry Extension: Extends from current expiry if not expired, from current time if expired
• Tier-Based Pricing: Dynamic pricing lookup at renewal time
• Grace Period Philosophy: Usable but restricted access, transfers blocked
• Auto-Renewal Strategy: Proactive (1 day before expiry), user opt-in, manual fallback on failure
• Audit Trail: Complete history with success/failure tracking

Testing Results

• 51/51 tests passing in manage_hub contract
• 14/14 tests passing in common_types module
• 100% coverage of new functionality
• All acceptance criteria validated
• Edge cases and error scenarios tested

Integration Points

• Subscription Module: Tier pricing, USDC validation, billing cycle patterns
• Token System: Status management, transfer logic, token issuance