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# Copyright (C) 2018  Lars Wirzenius
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.


import json
import unittest


import ick2


json_type = 'application/json'


class HttpAPITests(unittest.TestCase):

    def setUp(self):
        self.session = FakeHttpSession()
        self.session.token = 'SECRET-TOKEN'
        self.client = ick2.HttpAPI()
        self.client.set_session(self.session)
        self.client.set_token(self.session.token)

    def test_get_dict_raises_exception_on_error(self):
        self.session.response = FakeResponse(400)
        with self.assertRaises(ick2.HttpError):
            self.client.get_dict('http://controller/version')

    def test_get_dict_raises_exception_on_not_json(self):
        self.session.response = FakeResponse(200, body=json.dumps('{}'))
        with self.assertRaises(ick2.HttpError):
            self.client.get_dict('http://controller/version')

    def test_get_dict_raises_exception_on_malformed_json(self):
        self.session.response = FakeResponse(
            200, body='this is not really JSON', content_type=json_type)
        with self.assertRaises(ick2.HttpError):
            self.client.get_dict('http://controller/version')

    def test_get_dict_returns_response(self):
        version = {
            'version': '1.0',
        }

        self.session.response = FakeResponse(
            200, body=json.dumps(version), content_type=json_type)
        obj = self.client.get_dict('http://controller/version')
        self.assertEqual(obj, version)

    def test_get_blob_raises_exception_on_error(self):
        self.session.response = FakeResponse(404)
        with self.assertRaises(ick2.HttpError):
            self.client.get_blob('http://blobs/blob/foo')

    def test_get_blob_returns_response(self):
        blob = b'hello, world\n'
        self.session.response = FakeResponse(200, body=blob)
        obj = self.client.get_blob('http://blobs/blob/foo')
        self.assertEqual(obj, blob)

    def test_post_raises_exception_on_error(self):
        self.session.response = FakeResponse(400)
        with self.assertRaises(ick2.HttpError):
            self.client.post('http://controller/work', body='')

    def test_post_succeeds(self):
        work = {
            'project': 'foo',
            'stdout': 'hello, world\n',
        }

        self.session.response = FakeResponse(
            201, body=json.dumps(work), content_type=json_type)
        obj = self.client.post('http://controller/work', body=work)
        self.assertEqual(obj, None)

    def test_put_raises_exception_on_error(self):
        blob = b'fooblob'
        self.session.response = FakeResponse(400)
        with self.assertRaises(ick2.HttpError):
            self.client.put('http://blobs/blob/foo', body=blob)

    def test_put_succeeds(self):
        blob = b'fooblob'
        self.session.response = FakeResponse(201, body=None)
        obj = self.client.put('http://controller/work', body=blob)
        self.assertEqual(obj, None)


class FakeHttpSession:

    def __init__(self):
        self.response = None
        self.token = None

    def get(self, url, headers=None, verify=None):
        assert self.response is not None
        assert self.is_authorized(headers)
        return self.response

    def post(self, url, headers=None, data=None, verify=None):
        assert self.response is not None
        assert self.is_authorized(headers)
        return self.response

    def put(self, url, headers=None, data=None, verify=None):
        assert self.response is not None
        assert self.is_authorized(headers)
        return self.response

    def is_authorized(self, headers):
        assert self.token is not None
        assert 'Authorization' in headers
        v = headers['Authorization']
        return v == 'Bearer {}'.format(self.token)


class FakeResponse:

    def __init__(self, status_code, body=None, content_type=None):
        if content_type is None:
            content_type = 'application/octet-stream'

        self.status_code = status_code
        self.headers = {
            'Content-Type': content_type,
        }
        self.content = body

    @property
    def ok(self):
        return self.status_code in (200, 201)

    def json(self):
        return json.loads(self.content)