Convert IOErrors to Flask response for HTTP errors

http_errors.py

import errno

def error_response(error, filename):
    status = 500  # Default to "server error"

    if hasattr(error, 'errno'):
        if error.errno in [errno.EPERM, errno.EACCES]:
            status = 403  # Forbidden

        if error.errno in [errno.ENOENT, errno.ENXIO]:
            status = 404  # Not found

        if error.errno in [errno.EEXIST]:
            status = 409  # Conflict

        if error.errno in [errno.E2BIG]:
            status = 413  # Request Entity Too Large

    message = error.message

    if not message and hasattr(error, "strerror"):
        message = error.strerror
    elif not message and hasattr(error, "log_message"):
        message = error.log_message

    return {
        "filename": filename,
        "error_class": error.__class__.__name__,
        "message": message,
        "code": status
    }, status