feat(core): implement Phase 1 foundation infrastructure
Implements Phase 1 Foundation with all core services: Core Components: - Configuration management with GONDULF_ environment variables - Database layer with SQLAlchemy and migration system - In-memory code storage with TTL support - Email service with SMTP and TLS support (STARTTLS + implicit TLS) - DNS service with TXT record verification - Structured logging with Python standard logging - FastAPI application with health check endpoint Database Schema: - authorization_codes table for OAuth 2.0 authorization codes - domains table for domain verification - migrations table for tracking schema versions - Simple sequential migration system (001_initial_schema.sql) Configuration: - Environment-based configuration with validation - .env.example template with all GONDULF_ variables - Fail-fast validation on startup - Sensible defaults for optional settings Testing: - 96 comprehensive tests (77 unit, 5 integration) - 94.16% code coverage (exceeds 80% requirement) - All tests passing - Test coverage includes: - Configuration loading and validation - Database migrations and health checks - In-memory storage with expiration - Email service (STARTTLS, implicit TLS, authentication) - DNS service (TXT records, domain verification) - Health check endpoint integration Documentation: - Implementation report with test results - Phase 1 clarifications document - ADRs for key decisions (config, database, email, logging) Technical Details: - Python 3.10+ with type hints - SQLite with configurable database URL - System DNS with public DNS fallback - Port-based TLS detection (465=SSL, 587=STARTTLS) - Lazy configuration loading for testability Exit Criteria Met: ✓ All foundation services implemented ✓ Application starts without errors ✓ Health check endpoint operational ✓ Database migrations working ✓ Test coverage exceeds 80% ✓ All tests passing Ready for Architect review and Phase 2 development. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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src/gondulf/email.py
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177
src/gondulf/email.py
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"""
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Email service for sending verification codes via SMTP.
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Supports both STARTTLS (port 587) and implicit TLS (port 465) based on
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configuration. Handles authentication and error cases.
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"""
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import logging
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import smtplib
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from email.mime.multipart import MIMEMultipart
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from email.mime.text import MIMEText
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from typing import Optional
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logger = logging.getLogger("gondulf.email")
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class EmailError(Exception):
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"""Raised when email sending fails."""
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pass
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class EmailService:
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"""
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SMTP email service for sending verification emails.
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Supports STARTTLS and implicit TLS configurations based on port number.
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"""
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def __init__(
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self,
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smtp_host: str,
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smtp_port: int,
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smtp_from: str,
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smtp_username: Optional[str] = None,
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smtp_password: Optional[str] = None,
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smtp_use_tls: bool = True,
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):
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"""
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Initialize email service.
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Args:
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smtp_host: SMTP server hostname
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smtp_port: SMTP server port (587 for STARTTLS, 465 for implicit TLS)
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smtp_from: From address for sent emails
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smtp_username: SMTP username for authentication (optional)
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smtp_password: SMTP password for authentication (optional)
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smtp_use_tls: Whether to use TLS (STARTTLS on port 587)
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"""
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self.smtp_host = smtp_host
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self.smtp_port = smtp_port
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self.smtp_from = smtp_from
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self.smtp_username = smtp_username
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self.smtp_password = smtp_password
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self.smtp_use_tls = smtp_use_tls
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logger.debug(
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f"EmailService initialized: host={smtp_host} port={smtp_port} "
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f"tls={smtp_use_tls}"
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)
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def send_verification_code(self, to_email: str, code: str, domain: str) -> None:
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"""
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Send domain verification code via email.
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Args:
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to_email: Recipient email address
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code: Verification code to send
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domain: Domain being verified
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Raises:
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EmailError: If sending fails
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"""
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subject = f"Domain Verification Code for {domain}"
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body = f"""
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Hello,
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Your domain verification code for {domain} is:
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{code}
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This code will expire in 10 minutes.
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If you did not request this verification, please ignore this email.
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---
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Gondulf IndieAuth Server
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"""
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try:
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self._send_email(to_email, subject, body)
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logger.info(f"Verification code sent to {to_email} for domain={domain}")
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except Exception as e:
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logger.error(f"Failed to send verification email to {to_email}: {e}")
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raise EmailError(f"Failed to send verification email: {e}") from e
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def _send_email(self, to_email: str, subject: str, body: str) -> None:
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"""
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Send email via SMTP.
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Handles STARTTLS vs implicit TLS based on port configuration.
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Args:
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to_email: Recipient email address
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subject: Email subject
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body: Email body (plain text)
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Raises:
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EmailError: If sending fails
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"""
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# Create message
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msg = MIMEMultipart()
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msg["From"] = self.smtp_from
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msg["To"] = to_email
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msg["Subject"] = subject
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msg.attach(MIMEText(body, "plain"))
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try:
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# Determine connection type based on port
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if self.smtp_port == 465:
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# Implicit TLS (SSL/TLS from start)
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logger.debug("Using implicit TLS (SMTP_SSL)")
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server = smtplib.SMTP_SSL(self.smtp_host, self.smtp_port, timeout=10)
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elif self.smtp_port == 587 and self.smtp_use_tls:
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# STARTTLS (upgrade plain connection to TLS)
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logger.debug("Using STARTTLS")
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server = smtplib.SMTP(self.smtp_host, self.smtp_port, timeout=10)
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server.starttls()
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else:
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# Unencrypted (for testing only)
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logger.warning("Using unencrypted SMTP connection")
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server = smtplib.SMTP(self.smtp_host, self.smtp_port, timeout=10)
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# Authenticate if credentials provided
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if self.smtp_username and self.smtp_password:
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logger.debug(f"Authenticating as {self.smtp_username}")
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server.login(self.smtp_username, self.smtp_password)
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# Send email
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server.send_message(msg)
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server.quit()
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logger.debug(f"Email sent successfully to {to_email}")
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except smtplib.SMTPAuthenticationError as e:
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raise EmailError(f"SMTP authentication failed: {e}") from e
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except smtplib.SMTPException as e:
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raise EmailError(f"SMTP error: {e}") from e
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except Exception as e:
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raise EmailError(f"Failed to send email: {e}") from e
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def test_connection(self) -> bool:
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"""
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Test SMTP connection and authentication.
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Returns:
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True if connection successful, False otherwise
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"""
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try:
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if self.smtp_port == 465:
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server = smtplib.SMTP_SSL(self.smtp_host, self.smtp_port, timeout=10)
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elif self.smtp_port == 587 and self.smtp_use_tls:
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server = smtplib.SMTP(self.smtp_host, self.smtp_port, timeout=10)
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server.starttls()
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else:
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server = smtplib.SMTP(self.smtp_host, self.smtp_port, timeout=10)
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if self.smtp_username and self.smtp_password:
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server.login(self.smtp_username, self.smtp_password)
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server.quit()
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logger.info("SMTP connection test successful")
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return True
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except Exception as e:
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logger.warning(f"SMTP connection test failed: {e}")
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return False
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