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"""
Data validation utilities for Medical Transcriber application.
Provides validation functions for audio files, text, patient data, etc.
"""
from pathlib import Path
from typing import Tuple, Optional
from .constants import AudioFormats, ValidationRules
from .exceptions import ValidationException, AudioFileException
from .logger import get_logger
logger = get_logger(__name__)
class Validator:
"""Centralized validation utility."""
@staticmethod
def validate_audio_file(file_path: str) -> Path:
"""
Validate audio file existence and format.
Args:
file_path: Path to audio file
Returns:
Validated Path object
Raises:
AudioFileException: If file doesn't exist or invalid format
ValidationException: If file path is invalid
"""
logger.debug(f"Validating audio file: {file_path}")
if not file_path:
logger.error("Audio file path is required")
raise ValidationException("audio_file", "", "Audio file path is required")
audio_path = Path(file_path)
if not audio_path.exists():
logger.error(f"Audio file not found: {audio_path}")
raise AudioFileException(str(audio_path), "File does not exist")
if not audio_path.is_file():
logger.error(f"Path is not a file: {audio_path}")
raise AudioFileException(str(audio_path), "Path is not a file")
if audio_path.suffix.lower() not in AudioFormats.SUPPORTED_EXTENSIONS:
logger.error(f"Unsupported audio format: {audio_path.suffix}")
raise AudioFileException(
str(audio_path),
f"Unsupported format. Supported: {', '.join(AudioFormats.SUPPORTED_EXTENSIONS)}"
)
if audio_path.stat().st_size == 0:
logger.error(f"Audio file is empty: {audio_path}")
raise AudioFileException(str(audio_path), "File is empty")
logger.info(f"✓ Audio file validated: {audio_path} ({audio_path.stat().st_size} bytes)")
return audio_path
@staticmethod
def validate_text(text: str, field_name: str = "text") -> str:
"""
Validate text content.
Args:
text: Text to validate
field_name: Name of the field for error messages
Returns:
Validated text
Raises:
ValidationException: If text is invalid
"""
logger.debug(f"Validating text field '{field_name}': {len(text)} chars")
if not text:
logger.error(f"Text field '{field_name}' cannot be empty")
raise ValidationException(field_name, "", "Text cannot be empty")
if len(text) < ValidationRules.MIN_TEXT_LENGTH:
logger.error(f"Text field '{field_name}' is too short ({len(text)} < {ValidationRules.MIN_TEXT_LENGTH})")
raise ValidationException(
field_name,
text,
f"Text must be at least {ValidationRules.MIN_TEXT_LENGTH} characters"
)
if len(text) > ValidationRules.MAX_TEXT_LENGTH:
logger.error(f"Text field '{field_name}' is too long ({len(text)} > {ValidationRules.MAX_TEXT_LENGTH})")
raise ValidationException(
field_name,
text[:50],
f"Text exceeds maximum length of {ValidationRules.MAX_TEXT_LENGTH} characters"
)
logger.info(f"✓ Text field '{field_name}' validated: {len(text.strip())} chars")
return text.strip()
@staticmethod
def validate_patient_name(name: Optional[str]) -> Optional[str]:
"""
Validate patient name.
Args:
name: Patient name
Returns:
Validated name or None
Raises:
ValidationException: If name format is invalid
"""
logger.debug(f"Validating patient name: {name}")
if not name:
logger.debug("Patient name is optional, skipping validation")
return None
name = name.strip()
if len(name) < 3:
logger.error(f"Patient name too short: '{name}' ({len(name)} < 3)")
raise ValidationException(
"patient_name",
name,
"Patient name must be at least 3 characters"
)
# Check for only letters, spaces, and hyphens
if not all(c.isalpha() or c.isspace() or c == '-' for c in name):
logger.error(f"Patient name contains invalid characters: '{name}'")
raise ValidationException(
"patient_name",
name,
"Patient name can only contain letters, spaces, and hyphens"
)
logger.info(f"✓ Patient name validated: '{name}'")
return name
@staticmethod
def validate_date(date_str: Optional[str], date_format: str = "%d.%m.%Y") -> Optional[str]:
"""
Validate date format.
Args:
date_str: Date string to validate
date_format: Expected date format
Returns:
Validated date string or None
Raises:
ValidationException: If date format is invalid
"""
logger.debug(f"Validating date: '{date_str}' (format: {date_format})")
if not date_str:
logger.debug("Date is optional, skipping validation")
return None
date_str = date_str.strip()
try:
from datetime import datetime
datetime.strptime(date_str, date_format)
logger.info(f"✓ Date validated: '{date_str}'")
return date_str
except ValueError as e:
logger.error(f"Invalid date format: '{date_str}' (expected: {date_format})")
raise ValidationException(
"date",
date_str,
f"Invalid date format. Expected: {date_format}"
)
@staticmethod
def validate_api_key(api_key: Optional[str]) -> Optional[str]:
"""
Validate API key format.
Args:
api_key: API key string
Returns:
Validated API key or None
Raises:
ValidationException: If API key is invalid
"""
logger.debug("Validating API key (hidden for security)")
if not api_key:
logger.debug("API key is optional, skipping validation")
return None
api_key = api_key.strip()
if len(api_key) < 10:
logger.error("API key seems too short to be valid")
raise ValidationException(
"api_key",
"***",
"API key seems too short to be valid"
)
logger.info(f"✓ API key validated ({len(api_key)} chars)")
return api_key
@staticmethod
def validate_file_path(path_str: str, must_exist: bool = False) -> Path:
"""
Validate file or directory path.
Args:
path_str: Path string
must_exist: Whether path must exist
Returns:
Validated Path object
Raises:
ValidationException: If path is invalid
"""
logger.debug(f"Validating file path: {path_str} (must_exist={must_exist})")
if not path_str:
logger.error("Path cannot be empty")
raise ValidationException("path", "", "Path cannot be empty")
try:
path = Path(path_str).resolve()
if must_exist and not path.exists():
logger.error(f"Path does not exist: {path}")
raise ValidationException(
"path",
str(path),
"Path does not exist"
)
logger.info(f"✓ File path validated: {path}")
return path
except (ValueError, OSError) as e:
raise ValidationException("path", path_str, f"Invalid path: {str(e)}")
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