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CRUNCHYROLL DOWNLOADER - CHALLENGE 2 SOLUTION
Chapter 2: Configuration Management
Challenge: Validation
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PROBLEM:
Extend Config to validate email format and required fields.

SOLUTION:
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File: config.py (updated with validation)

import os
import re
from pathlib import Path
from dotenv import load_dotenv

ENV_FILE = Path(__file__).parent / ".env"
load_dotenv(ENV_FILE)

class Config:
    """Crunchyroll configuration with validation."""

    def __init__(self):
        self.email = os.environ.get('CRUNCHYROLL_EMAIL')
        self.password = os.environ.get('CRUNCHYROLL_PASSWORD')
        self.api_base = os.environ.get('API_BASE_URL', 'https://api.crunchyroll.com')
        self.token_cache = os.environ.get('TOKEN_CACHE_FILE', 'token_cache.json')

    def validate(self) -> bool:
        """Validate all configuration values."""

        # Check email is not empty
        if not self.email:
            print("❌ CRUNCHYROLL_EMAIL is empty!")
            print("   Fix: Add CRUNCHYROLL_EMAIL=your-email@example.com to .env")
            return False

        # Check email is not whitespace
        if not self.email.strip():
            print("❌ CRUNCHYROLL_EMAIL is just whitespace!")
            return False

        # Validate email format
        email_pattern = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
        if not re.match(email_pattern, self.email):
            print(f"❌ CRUNCHYROLL_EMAIL '{self.email}' is not valid!")
            print("   Expected format: user@example.com")
            return False

        # Check password is not empty
        if not self.password:
            print("❌ CRUNCHYROLL_PASSWORD is empty!")
            print("   Fix: Add CRUNCHYROLL_PASSWORD=your-password to .env")
            return False

        if not self.password.strip():
            print("❌ CRUNCHYROLL_PASSWORD is just whitespace!")
            return False

        # Check password minimum length
        if len(self.password) < 6:
            print("❌ CRUNCHYROLL_PASSWORD is too short (minimum 6 characters)")
            return False

        # Check API base URL format
        if not self.api_base.startswith('http'):
            print(f"❌ API_BASE_URL '{self.api_base}' must start with http or https")
            return False

        print("✅ Configuration is valid!")
        return True


if __name__ == "__main__":
    config = Config()
    if config.validate():
        print("Ready to use!")
    else:
        print("Configuration has errors")


TESTING DIFFERENT SCENARIOS
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Test 1: Valid config
.env:
CRUNCHYROLL_EMAIL=user@gmail.com
CRUNCHYROLL_PASSWORD=mypassword123

Result: ✅ Configuration is valid!


Test 2: Missing email
.env:
CRUNCHYROLL_EMAIL=
CRUNCHYROLL_PASSWORD=mypassword123

Result: ❌ CRUNCHYROLL_EMAIL is empty!


Test 3: Invalid email format
.env:
CRUNCHYROLL_EMAIL=notanemail
CRUNCHYROLL_PASSWORD=mypassword123

Result: ❌ CRUNCHYROLL_EMAIL 'notanemail' is not valid!


Test 4: Password too short
.env:
CRUNCHYROLL_EMAIL=user@gmail.com
CRUNCHYROLL_PASSWORD=123

Result: ❌ CRUNCHYROLL_PASSWORD is too short (minimum 6 characters)


VALIDATION CHECKLIST
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✅ Email not empty
✅ Email is not just whitespace
✅ Email format is valid (has @ and domain)
✅ Password not empty
✅ Password not just whitespace
✅ Password minimum 6 characters
✅ API URL starts with http or https

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