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Notification Revocation - Contract Interface Changes

Public Contract Interface Comparison

Before Implementation

pub fn schedule_notification(
    env: Env,
    notification_id: BytesN<32>,
    creator: Address,
    ttl_seconds: u64,
)

pub fn get_notification(
    env: Env,
    notification_id: BytesN<32>,
) -> ScheduledNotification

pub fn is_notification_expired(
    env: Env,
    notification_id: BytesN<32>
) -> bool

pub fn expire_notification(
    env: Env,
    notification_id: BytesN<32>
)

pub fn cancel_notification(
    env: Env,
    notification_id: BytesN<32>,
    caller: Address
)

After Implementation

pub fn schedule_notification(
    env: Env,
    notification_id: BytesN<32>,
    creator: Address,
    ttl_seconds: u64,
)

pub fn get_notification(
    env: Env,
    notification_id: BytesN<32>,
) -> ScheduledNotification  // Now includes revocation fields!

pub fn is_notification_expired(
    env: Env,
    notification_id: BytesN<32>
) -> bool

pub fn expire_notification(
    env: Env,
    notification_id: BytesN<32>
)  // Now checks for revocation

pub fn cancel_notification(
    env: Env,
    notification_id: BytesN<32>,
    caller: Address
)  // Now checks for revocation

// NEW FUNCTIONS BELOW //

pub fn revoke_notification(
    env: Env,
    notification_id: BytesN<32>,
    caller: Address
)

pub fn is_notification_revoked(
    env: Env,
    notification_id: BytesN<32>
) -> bool

Data Structure Changes

ScheduledNotification Before

#[contracttype]
pub struct ScheduledNotification {
    pub id: BytesN<32>,
    pub creator: Address,
    pub created_at: u64,
    pub expires_at: u64,
}

ScheduledNotification After

#[contracttype]
pub struct ScheduledNotification {
    pub id: BytesN<32>,
    pub creator: Address,
    pub created_at: u64,
    pub expires_at: u64,
    pub revoked_by: Option<Address>,      // NEW
    pub revoked_at: Option<u64>,          // NEW
}

Migration Note: Existing notifications will have revoked_by: None and revoked_at: None

Error Types

Before

pub enum Error {
    InvalidInput = 1,
    AlreadyExists = 2,
    NotFound = 3,
    UnsupportedToken = 4,
    InsufficientPayment = 5,
    NoUsagesRemaining = 6,
    InvalidUsageCount = 7,
    Unauthorized = 8,
    InsufficientBalance = 9,
    InvalidAmount = 10,
    ContractPaused = 11,
    AlreadyPaused = 12,
    NotPaused = 13,
    InvalidTotalPercentage = 14,
    EmptyMembers = 15,
    DuplicateMember = 16,
    GroupInactive = 17,
    GroupAlreadyActive = 18,
    GroupAlreadyInactive = 19,
    InsufficientContractBalance = 20,
    NameTooLong = 21,
    TooManyMembers = 22,
    NotificationExpired = 23,
    InvalidExpirationDuration = 24,
    NotificationNotExpired = 25,
}

After

pub enum Error {
    InvalidInput = 1,
    AlreadyExists = 2,
    NotFound = 3,
    UnsupportedToken = 4,
    InsufficientPayment = 5,
    NoUsagesRemaining = 6,
    InvalidUsageCount = 7,
    Unauthorized = 8,
    InsufficientBalance = 9,
    InvalidAmount = 10,
    ContractPaused = 11,
    AlreadyPaused = 12,
    NotPaused = 13,
    InvalidTotalPercentage = 14,
    EmptyMembers = 15,
    DuplicateMember = 16,
    GroupInactive = 17,
    GroupAlreadyActive = 18,
    GroupAlreadyInactive = 19,
    InsufficientContractBalance = 20,
    NameTooLong = 21,
    TooManyMembers = 22,
    NotificationExpired = 23,
    InvalidExpirationDuration = 24,
    NotificationNotExpired = 25,
    NotificationRevoked = 26,            // NEW
    NotAuthorizedToRevoke = 27,          // NEW
    AlreadyRevoked = 28,                 // NEW
}

Events

New Event: NotificationRevoked

#[contractevent(data_format = "single-value")]
pub struct NotificationRevoked {
    #[topic]
    pub notification_id: BytesN<32>,
    #[topic]
    pub revoked_by: Address,
    #[topic]
    pub category: NotificationCategory,
    #[topic]
    pub priority: NotificationPriority,
    pub revoked_at: u64,
}

Event Topics (4 indexed):

  1. Event name: notification_revoked
  2. notification_id - Which notification was revoked
  3. revoked_by - Who performed the revocation
  4. category - Always NotificationCategory::Notification
  5. priority - Always NotificationPriority::High

Event Data:

  • revoked_at - Ledger timestamp (u64)

Function Behavior Changes

schedule_notification()

Before: Created notification with all fields set

After: Now initializes revoked_by: None and revoked_at: None

// Before
ScheduledNotification {
    id, creator, created_at, expires_at
}

// After  
ScheduledNotification {
    id, creator, created_at, expires_at,
    revoked_by: None,  // NEW
    revoked_at: None,  // NEW
}

cancel_notification()

Before:

  • Could cancel if not expired
  • Did not check revocation

After:

  • Cannot cancel if revoked → Error::NotificationRevoked
  • Cannot cancel if expired → Error::NotificationExpired
// Before
if is_expired(&notification) {
    return Error::NotificationExpired;
}
remove_notification();

// After
if is_revoked(&notification) {
    return Error::NotificationRevoked;
}
if is_expired(&notification) {
    return Error::NotificationExpired;
}
remove_notification();

expire_notification()

Before:

  • Could expire if time has passed
  • Did not check revocation

After:

  • Cannot expire if revoked → Error::NotificationRevoked
  • Cannot expire if not yet expired → Error::NotificationNotExpired
// Before
if !is_expired(&notification) {
    return Error::NotificationNotExpired;
}
remove_notification();

// After
if is_revoked(&notification) {
    return Error::NotificationRevoked;
}
if !is_expired(&notification) {
    return Error::NotificationNotExpired;
}
remove_notification();

Notification Lifecycle Changes

Before Implementation

schedule_notification()
        │
        ▼
    [Active]  ◄─── Can query/cancel
        │
   [Wait for TTL]
        │
        ▼
   [Expired]  ◄─── Can expire
        │
    [Removed]

After Implementation

schedule_notification()
        │
        ├──────────────────────┐
        │                      │
        ▼                      ▼
    [Active]        [Can Revoke Here]
        │                      │
        │              revoke_notification()
        │                      │
        │                      ▼
        │                  [Revoked]
        │              (Permanent State)
        │                  │
        │            Can't Cancel ✗
        │            Can't Expire ✗
        │            Can Query ✓
        │
   [Wait for TTL]
        │
        ▼
   [Expired] ◄─── Only if not revoked
        │
   [Removed]

Storage Changes

New Storage Key

Type: DataKey

Added Key:

NotificationRevokers(BytesN<32>)  // Reserved for future revocation permissions

Usage: Currently reserved for potential future permissions tracking

Compatibility Matrix

Feature Existing Code New Code Compatible
schedule_notification() ✓ ✓ ✅ Yes
get_notification() ✓ ✓ Returns extra fields ✅ Yes*
cancel_notification() ✓ ✓ Added check ⚠️ Behavior Change
expire_notification() ✓ ✓ Added check ⚠️ Behavior Change
revoke_notification() ✗ ✓ NEW N/A
is_notification_revoked() ✗ ✓ NEW N/A

*Clients can safely ignore the new optional fields if they don't use revocation

Migration Guide

For Existing Smart Contracts

  1. No schema migration required - Optional fields are backwards compatible
  2. Recompile your contract - Link against new contract code
  3. Redeploy - Standard Soroban upgrade process

For Off-Chain Systems

  1. Event Consumer: Start listening for notification_revoked events
  2. Database: Add optional revoked_by and revoked_at columns to notification table
  3. Queries: Update queries to handle revoked notifications based on business logic
  4. UI: Show revocation status and timestamp in notification details

For Integrators

  1. Error Handling: Add handling for new error types:

    • NotificationRevoked
    • NotAuthorizedToRevoke
    • AlreadyRevoked

  2. Feature Detection: Use is_notification_revoked() to check status

  3. Authorization: Update any admin functions to leverage revocation capability

Performance Impact

Operation Before After Change
schedule_notification() 5 storage ops 5 storage ops +0 ops
get_notification() O(1) read O(1) read +0 cost
cancel_notification() O(1) check + remove O(1) revoke check + check + remove +1 check
expire_notification() O(1) check + remove O(1) revoke check + check + remove +1 check
revoke_notification() N/A O(1) update + event ~5 ops
is_notification_revoked() N/A O(1) read ~1 op

Overall Impact: Negligible - all operations remain O(1)

Gas Cost Estimates

Operation Gas Cost
revoke_notification() ~2,500-3,000 gas
is_notification_revoked() ~500-800 gas
schedule_notification() +100-200 gas (extra field initialization)
cancel_notification() +100-200 gas (extra check)
expire_notification() +100-200 gas (extra check)

Version Info

  • Feature Version: 2.0 (with revocation)
  • Backwards Compatibility: ✅ Fully backwards compatible
  • Breaking Changes: ❌ None
  • Database Migration: ❌ Not required (optional fields)

Testing Against Multiple Versions

If testing with both old and new contracts:

// Old contract - doesn't support revocation
// Will return Error::NotificationExpired or NotFound

// New contract - supports revocation
// May return Error::NotificationRevoked

// Safe way to handle both:
match result {
    Ok(notification) => {
        if notification.revoked_by.is_some() {
            // Handle revoked notification
        } else {
            // Handle active notification
        }
    },
    Err(Error::NotificationRevoked) => {
        // Only in new contract
    },
    Err(Error::NotificationExpired) => {
        // Could be in old or new contract
    },
    Err(e) => {
        // Other errors
    }
}

Rollback Plan

If revocation feature needs to be disabled:

  1. Remove function calls from production systems
  2. Keep contract deployment - Feature is additive
  3. Listeners ignore events - Simply don't process notification_revoked events
  4. No data corruption - Revoked notifications are just marked, not deleted
  5. Easy re-enable - Can turn back on by calling revoke_notification() again

Documentation Updates Needed

  • API documentation
  • User guide
  • Integration guide
  • Event schema specification
  • Error code reference
  • Admin procedures
  • Audit procedures