#!/usr/bin/python
#

# Copyright (C) 2012 Google Inc.
# All rights reserved.
#
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# modification, are permitted provided that the following conditions are
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# 1. Redistributions of source code must retain the above copyright notice,
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# 2. Redistributions in binary form must reproduce the above copyright
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"""Script for testing ganeti.server.rapi"""

import re
import unittest
import random
import mimetools
import base64
from cStringIO import StringIO

from ganeti import constants
from ganeti import utils
from ganeti import compat
from ganeti import errors
from ganeti import serializer
from ganeti import rapi
from ganeti import http
from ganeti import objects

from ganeti.rapi.auth.basic_auth import BasicAuthenticator
from ganeti.rapi.auth import users_file
import ganeti.rapi.testutils
import ganeti.rapi.rlib2
import ganeti.http.auth

import testutils


class TestRemoteApiHandler(unittest.TestCase):
  @staticmethod
  def _LookupWrongUser(_):
    return None

  def _Test(self, method, path, headers, reqbody,
            user_fn=NotImplemented, luxi_client=NotImplemented,
            reqauth=False):
    rm = rapi.testutils._RapiMock(BasicAuthenticator(user_fn), luxi_client,
                                  reqauth=reqauth)

    (resp_code, resp_headers, resp_body) = \
      rm.FetchResponse(path, method, http.ParseHeaders(StringIO(headers)),
                       reqbody)

    self.assertTrue(resp_headers[http.HTTP_DATE])
    self.assertEqual(resp_headers[http.HTTP_CONNECTION], "close")
    self.assertEqual(resp_headers[http.HTTP_CONTENT_TYPE], http.HTTP_APP_JSON)
    self.assertEqual(resp_headers[http.HTTP_SERVER], http.HTTP_GANETI_VERSION)

    return (resp_code, resp_headers, serializer.LoadJson(resp_body))

  def testRoot(self):
    (code, _, data) = self._Test(http.HTTP_GET, "/", "", None)
    self.assertEqual(code, http.HTTP_OK)
    self.assertTrue(data is None)

  def testRootReqAuth(self):
    (code, _, _) = self._Test(http.HTTP_GET, "/", "", None, reqauth=True)
    self.assertEqual(code, http.HttpUnauthorized.code)

  def testVersion(self):
    (code, _, data) = self._Test(http.HTTP_GET, "/version", "", None)
    self.assertEqual(code, http.HTTP_OK)
    self.assertEqual(data, constants.RAPI_VERSION)

  def testSlashTwo(self):
    (code, _, data) = self._Test(http.HTTP_GET, "/2", "", None)
    self.assertEqual(code, http.HTTP_OK)
    self.assertTrue(data is None)

  def testFeatures(self):
    (code, _, data) = self._Test(http.HTTP_GET, "/2/features", "", None)
    self.assertEqual(code, http.HTTP_OK)
    self.assertEqual(set(data), set(rapi.rlib2.ALL_FEATURES))

  def testPutInstances(self):
    (code, _, data) = self._Test(http.HTTP_PUT, "/2/instances", "", None)
    self.assertEqual(code, http.HttpNotImplemented.code)
    self.assertTrue(data["message"].startswith("Method PUT is unsupported"))

  def testPostInstancesNoAuth(self):
    (code, _, _) = self._Test(http.HTTP_POST, "/2/instances", "", None,
                              reqauth=True)
    self.assertEqual(code, http.HttpUnauthorized.code)

  def testRequestWithUnsupportedMediaType(self):
    for fn in [lambda s: s, lambda s: s.upper(), lambda s: s.title()]:
      headers = rapi.testutils._FormatHeaders([
        "%s: %s" % (http.HTTP_CONTENT_TYPE, fn("un/supported/media/type")),
        ])
      (code, _, data) = self._Test(http.HTTP_GET, "/", headers, "body")
      self.assertEqual(code, http.HttpUnsupportedMediaType.code)
      self.assertEqual(data["message"], "Unsupported Media Type")

  def testRequestWithInvalidJsonData(self):
    body = "_this/is/no'valid.json"
    self.assertRaises(Exception, serializer.LoadJson, body)

    headers = rapi.testutils._FormatHeaders([
      "%s: %s" % (http.HTTP_CONTENT_TYPE, http.HTTP_APP_JSON),
      ])

    (code, _, data) = self._Test(http.HTTP_GET, "/", headers, body)
    self.assertEqual(code, http.HttpBadRequest.code)
    self.assertEqual(data["message"], "Unable to parse JSON data")

  def testUnsupportedAuthScheme(self):
    headers = rapi.testutils._FormatHeaders([
      "%s: %s" % (http.HTTP_AUTHORIZATION, "Unsupported scheme"),
      ])

    (code, _, _) = self._Test(http.HTTP_POST, "/2/instances", headers, "",
                              reqauth=True)
    self.assertEqual(code, http.HttpUnauthorized.code)

  def testIncompleteBasicAuth(self):
    headers = rapi.testutils._FormatHeaders([
      "%s: Basic" % http.HTTP_AUTHORIZATION,
      ])

    (code, _, data) = self._Test(http.HTTP_POST, "/2/instances", headers, "",
                                 reqauth=True)
    self.assertEqual(code, http.HttpBadRequest.code)
    self.assertEqual(data["message"],
                     "Basic authentication requires credentials")

  def testInvalidBasicAuth(self):
    for auth in ["!invalid=base!64.", base64.b64encode(" "),
                 base64.b64encode("missingcolonchar")]:
      headers = rapi.testutils._FormatHeaders([
        "%s: Basic %s" % (http.HTTP_AUTHORIZATION, auth),
        ])

      (code, _, data) = self._Test(http.HTTP_POST, "/2/instances", headers, "",
                                   reqauth=True)
      self.assertEqual(code, http.HttpBadRequest.code)

  @staticmethod
  def _MakeAuthHeaders(username, password, correct_password):
    if correct_password:
      pw = password
    else:
      pw = "wrongpass"

    return rapi.testutils._FormatHeaders([
      "%s: Basic %s" % (http.HTTP_AUTHORIZATION,
                        base64.b64encode("%s:%s" % (username, pw))),
      "%s: %s" % (http.HTTP_CONTENT_TYPE, http.HTTP_APP_JSON),
      ])

  def testQueryAuth(self):
    username = "admin"
    password = "2046920054"

    header_fn = compat.partial(self._MakeAuthHeaders, username, password)

    def _LookupUserNoWrite(name):
      if name == username:
        return users_file.PasswordFileUser(name, password, [])
      else:
        return None

    for access in [rapi.RAPI_ACCESS_WRITE, rapi.RAPI_ACCESS_READ]:
      def _LookupUserWithWrite(name):
        if name == username:
          return users_file.PasswordFileUser(name, password, [access])
        else:
          return None

      for qr in constants.QR_VIA_RAPI:
        # The /2/query resource has somewhat special rules for authentication as
        # it can be used to retrieve critical information
        path = "/2/query/%s" % qr

        for method in rapi.baserlib._SUPPORTED_METHODS:
          # No authorization
          (code, _, _) = self._Test(method, path, "", "", reqauth=True)

          if method in (http.HTTP_DELETE, http.HTTP_POST):
            self.assertEqual(code, http.HttpNotImplemented.code)
            continue

          self.assertEqual(code, http.HttpUnauthorized.code)

          # Incorrect user
          (code, _, _) = self._Test(method, path, header_fn(True), "",
                                    user_fn=self._LookupWrongUser, reqauth=True)
          self.assertEqual(code, http.HttpUnauthorized.code)

          # User has no write access, but the password is correct
          (code, _, _) = self._Test(method, path, header_fn(True), "",
                                    user_fn=_LookupUserNoWrite, reqauth=True)
          self.assertEqual(code, http.HttpForbidden.code)

          # Wrong password and no write access
          (code, _, _) = self._Test(method, path, header_fn(False), "",
                                    user_fn=_LookupUserNoWrite, reqauth=True)
          self.assertEqual(code, http.HttpUnauthorized.code)

          # Wrong password with write access
          (code, _, _) = self._Test(method, path, header_fn(False), "",
                                    user_fn=_LookupUserWithWrite, reqauth=True)
          self.assertEqual(code, http.HttpUnauthorized.code)

          # Prepare request information
          if method == http.HTTP_PUT:
            reqpath = path
            body = serializer.DumpJson({
              "fields": ["name"],
              })
          elif method == http.HTTP_GET:
            reqpath = "%s?fields=name" % path
            body = ""
          else:
            self.fail("Unknown method '%s'" % method)

          # User has write access, password is correct
          (code, _, data) = self._Test(method, reqpath, header_fn(True), body,
                                       user_fn=_LookupUserWithWrite,
                                       luxi_client=_FakeLuxiClientForQuery,
                                       reqauth=True)
          self.assertEqual(code, http.HTTP_OK)
          self.assertTrue(objects.QueryResponse.FromDict(data))

  def testConsole(self):
    path = "/2/instances/inst1.example.com/console"

    for method in rapi.baserlib._SUPPORTED_METHODS:
      for reqauth in [False, True]:
        if method == http.HTTP_GET and not reqauth:
          # we don't have a mock client to test this case
          continue
        # No authorization
        (code, _, _) = self._Test(method, path, "", "",
                                  user_fn=lambda _ : None, reqauth=reqauth)

        if method == http.HTTP_GET and reqauth:
          self.assertEqual(code, http.HttpUnauthorized.code)
        else:
          self.assertEqual(code, http.HttpNotImplemented.code)


class _FakeLuxiClientForQuery:
  def __init__(self, *args, **kwargs):
    pass

  def Query(self, *args):
    return objects.QueryResponse(fields=[])


if __name__ == "__main__":
  testutils.GanetiTestProgram()