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import os, shutil, tempfile
from contextlib import contextmanager
from libmproxy import flow, utils, controller
from netlib import certutils
import mock

def treq(conn=None):
    if not conn:
        conn = flow.ClientConnect(("address", 22))
    conn.reply = controller.DummyReply()
    headers = flow.ODictCaseless()
    headers["header"] = ["qvalue"]
    r = flow.Request(conn, (1, 1), "host", 80, "http", "GET", "/path", headers, "content")
    r.reply = controller.DummyReply()
    return r


def tresp(req=None):
    if not req:
        req = treq()
    headers = flow.ODictCaseless()
    headers["header_response"] = ["svalue"]
    cert = certutils.SSLCert.from_der(file(test_data.path("data/dercert"),"rb").read())
    resp = flow.Response(req, (1, 1), 200, "message", headers, "content_response", cert)
    resp.reply = controller.DummyReply()
    return resp


def tflow():
    r = treq()
    return flow.Flow(r)


def tflow_full():
    r = treq()
    f = flow.Flow(r)
    f.response = tresp(r)
    return f


def tflow_err():
    r = treq()
    f = flow.Flow(r)
    f.error = flow.Error(r, "error")
    f.error.reply = controller.DummyReply()
    return f



@contextmanager
def tmpdir(*args, **kwargs):
    orig_workdir = os.getcwd()
    temp_workdir = tempfile.mkdtemp(*args, **kwargs)
    os.chdir(temp_workdir)

    yield temp_workdir

    os.chdir(orig_workdir)
    shutil.rmtree(temp_workdir)


def raises(exc, obj, *args, **kwargs):
    """
        Assert that a callable raises a specified exception.

        :exc An exception class or a string. If a class, assert that an
        exception of this type is raised. If a string, assert that the string
        occurs in the string representation of the exception, based on a
        case-insenstivie match.

        :obj A callable object.

        :args Arguments to be passsed to the callable.

        :kwargs Arguments to be passed to the callable.
    """
    try:
        apply(obj, args, kwargs)
    except Exception, v:
        if isinstance(exc, basestring):
            if exc.lower() in str(v).lower():
                return
            else:
                raise AssertionError(
                    "Expected %s, but caught %s"%(
                        repr(str(exc)), v
                    )
                )
        else:
            if isinstance(v, exc):
                return
            else:
                raise AssertionError(
                    "Expected %s, but caught %s %s"%(
                        exc.__name__, v.__class__.__name__, str(v)
                    )
                )
    raise AssertionError("No exception raised.")

test_data = utils.Data(__name__)