Claude-skill-registry check-blacklist

User Input

$ARGUMENTS

Format: email address to check, or

list

to show all blacklisted emails

Task

Check if an email is blacklisted or list all blacklisted emails with expiry dates.

Steps

1. Parse Arguments:

   if [ "${ARGUMENTS}" = "list" ]; then
       ACTION="list"
   elif [ -n "${ARGUMENTS}" ]; then
       ACTION="check"
       EMAIL="${ARGUMENTS}"
   else
       echo "Usage: /check-blacklist <email> or /check-blacklist list"
       exit 1
   fi
   

2. Check Single Email:

   if [ "${ACTION}" = "check" ]; then
       cd backend
       python -c "
       from src.models.email_blacklist import EmailBlacklist
       from src.lib.email_utils import normalize_email
       from src.lib.database import SessionLocal
       from datetime import datetime
   
       email = '${EMAIL}'
       normalized = normalize_email(email)
   
       db = SessionLocal()
       blacklist_entry = db.query(EmailBlacklist).filter_by(
           normalized_email=normalized
       ).first()
   
       if blacklist_entry:
           days_remaining = (blacklist_entry.expires_at - datetime.utcnow()).days
           print(f'❌ Email is BLACKLISTED')
           print(f'   Normalized: {normalized}')
           print(f'   Reason: {blacklist_entry.reason}')
           print(f'   Blacklisted: {blacklist_entry.created_at}')
           print(f'   Expires: {blacklist_entry.expires_at}')
           print(f'   Days remaining: {days_remaining}')
       else:
           print(f'✅ Email is NOT blacklisted')
           print(f'   Normalized: {normalized}')
       "
   fi
   

3. List All Blacklisted Emails:

   if [ "${ACTION}" = "list" ]; then
       cd backend
       python -c "
       from src.models.email_blacklist import EmailBlacklist
       from src.lib.database import SessionLocal
       from datetime import datetime
   
       db = SessionLocal()
       entries = db.query(EmailBlacklist).all()
   
       print(f'📋 Blacklisted Emails: {len(entries)}')
       print('━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━')
   
       for entry in entries:
           days_remaining = (entry.expires_at - datetime.utcnow()).days
           status = 'ACTIVE' if days_remaining > 0 else 'EXPIRED'
   
           print(f'\n{status}: {entry.normalized_email}')
           print(f'   Reason: {entry.reason}')
           print(f'   Created: {entry.created_at.strftime(\"%Y-%m-%d\")}')
           print(f'   Expires: {entry.expires_at.strftime(\"%Y-%m-%d\")} ({days_remaining}d)')
   
       # Count by reason
       chargebacks = sum(1 for e in entries if e.reason == 'chargeback')
       print(f'\nSummary:')
       print(f'  Chargebacks: {chargebacks}')
       print(f'  Total: {len(entries)}')
       "
   fi
   

4. Check Expiring Soon (optional):

   python -c "
   from src.models.email_blacklist import EmailBlacklist
   from src.lib.database import SessionLocal
   from datetime import datetime, timedelta
   
   db = SessionLocal()
   expiring_soon = db.query(EmailBlacklist).filter(
       EmailBlacklist.expires_at < datetime.utcnow() + timedelta(days=7),
       EmailBlacklist.expires_at > datetime.utcnow()
   ).all()
   
   if expiring_soon:
       print(f'\n⚠️ Expiring within 7 days: {len(expiring_soon)}')
       for entry in expiring_soon:
           days = (entry.expires_at - datetime.utcnow()).days
           print(f'  - {entry.normalized_email} ({days}d)')
   "
   

5. Output Summary:

   For Single Check:

   ✅ Email Blacklist Check
   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   
   Email: user@example.com
   Normalized: user@example.com
   
   Status: ❌ BLACKLISTED
   
   Reason: chargeback
   Blacklisted: 2025-11-15
   Expires: 2026-02-13
   Days Remaining: 45
   
   Note: This email cannot make purchases until expiry.
   

   For List:

   📋 Blacklisted Emails Report
   ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
   
   Total: 12 emails
   
   ACTIVE: fraudster@example.com
     Reason: chargeback
     Created: 2025-11-20
     Expires: 2026-02-18 (51d)
   
   ACTIVE: abuser@example.com
     Reason: chargeback
     Created: 2025-12-01
     Expires: 2026-03-01 (62d)
   
   EXPIRED: oldcase@example.com
     Reason: chargeback
     Created: 2025-08-01
     Expires: 2025-10-30 (-31d)
   
   Summary:
     Chargebacks: 12
     Total: 12
   
   ⚠️ Expiring within 7 days: 2
     - user1@example.com (3d)
     - user2@example.com (6d)
   

Example Usage

/check-blacklist user@example.com    # Check specific email
/check-blacklist list                # List all blacklisted emails

Exit Criteria

• Email checked against blacklist
• Blacklist status and details displayed
• Expiry date calculated
• All blacklisted emails listed (if list command)

Blacklist Policy (FR-P-009)

• Trigger: Chargeback received from payment processor
• Duration: 90 days from blacklist date
• Effect: Prevents checkout via normalized_email lookup
• Auto-Cleanup: Expired entries removed by cleanup job
• Normalization: Email normalized to prevent bypass (dots/plus tags removed)