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Edit File: utils.py

"""
oauthlib.utils
~~~~~~~~~~~~~~

This module contains utility methods used by various parts of the OAuth 2 spec.
"""
import datetime
import os
from urllib.parse import quote, urlparse

from oauthlib.common import urldecode

def list_to_scope(scope):
    """Convert a list of scopes to a space separated string."""
    if isinstance(scope, str) or scope is None:
        return scope
    elif isinstance(scope, (set, tuple, list)):
        return " ".join([str(s) for s in scope])
    else:
        raise ValueError("Invalid scope (%s), must be string, tuple, set, or list." % scope)

def scope_to_list(scope):
    """Convert a space separated string to a list of scopes."""
    if isinstance(scope, (tuple, list, set)):
        return [str(s) for s in scope]
    elif scope is None:
        return None
    else:
        return scope.strip().split(" ")

def params_from_uri(uri):
    params = dict(urldecode(urlparse(uri).query))
    if 'scope' in params:
        params['scope'] = scope_to_list(params['scope'])
    return params

def host_from_uri(uri):
    """Extract hostname and port from URI.

Will use default port for HTTP and HTTPS if none is present in the URI.
    """
    default_ports = {
        'HTTP': '80',
        'HTTPS': '443',
    }

sch, netloc, path, par, query, fra = urlparse(uri)
    if ':' in netloc:
        netloc, port = netloc.split(':', 1)
    else:
        port = default_ports.get(sch.upper())

return netloc, port

def escape(u):
    """Escape a string in an OAuth-compatible fashion.

TODO: verify whether this can in fact be used for OAuth 2

"""
    if not isinstance(u, str):
        raise ValueError('Only unicode objects are escapable.')
    return quote(u.encode('utf-8'), safe=b'~')

def generate_age(issue_time):
    """Generate a age parameter for MAC authentication draft 00."""
    td = datetime.datetime.now() - issue_time
    age = (td.microseconds + (td.seconds + td.days * 24 * 3600)
           * 10 ** 6) / 10 ** 6
    return str(age)

def is_secure_transport(uri):
    """Check if the uri is over ssl."""
    if os.environ.get('OAUTHLIB_INSECURE_TRANSPORT'):
        return True
    return uri.lower().startswith('https://')