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from base64 import b64decode, b64encode

import pytest
from webtest import TestApp

import paste.db
from paste import application
from paste.store import Auth

DB = "file::memory:?cache=shared"


@pytest.fixture
def db():
    with paste.db.connect(DB) as d:
        yield d


@pytest.fixture
def app(db):
    _ = db
    app = TestApp(application, extra_environ={"HTTP_HOST": "localhost", "PASTE_DB": DB})
    yield app


@pytest.fixture
def token(db):
    return b64encode(Auth(db).generate_token()).decode()


@pytest.mark.parametrize("method", ["put", "post", "delete"])
def test_without_apikey(app, method):
    res = getattr(app, method)(
        "/test_key",
        "Hello, World!",
        headers={"Content-Type": "text/plain"},
        expect_errors=True,
    )
    assert res.status == "401 Unauthorized"
    assert res.headers["WWW-Authenticate"] == "APIKey"


@pytest.mark.parametrize("method", ["put", "post", "delete"])
def test_malformed_authorization_header(app, method):
    res = getattr(app, method)(
        "/test_key",
        "Hello, World!",
        headers={"Content-Type": "text/plain", "Authorization": "malformed"},
        expect_errors=True,
    )
    assert res.status == "401 Unauthorized"
    assert res.headers["WWW-Authenticate"] == "APIKey"


@pytest.mark.parametrize("method", ["put", "post", "delete"])
def test_malformed_apikey(app, method):
    res = getattr(app, method)(
        "/test_key" "Hello, World!",
        headers={"Content-Type": "text/plain", "Authorization": "APIKey malformed"},
        expect_errors=True,
    )
    assert res.status == "401 Unauthorized"
    assert res.headers["WWW-Authenticate"] == "APIKey"


@pytest.mark.parametrize("method", ["put", "post", "delete"])
def test_invalid_apikey(app, method, token):
    invalid = b64encode(bytes(b ^ 13 for b in b64decode(token))).decode()
    res = getattr(app, method)(
        "/test_key" "Hello, World!",
        headers={"Content-Type": "text/plain", "Authorization": f"APIKey {invalid}"},
        expect_errors=True,
    )
    assert res.status == "401 Unauthorized"
    assert res.headers["WWW-Authenticate"] == "APIKey"


def test_put(app, token):
    res = app.put(
        "/test_key",
        "Hello, World!",
        headers={"Content-Type": "text/plain", "Authorization": f"APIKey {token}"},
    )
    assert res.status == "201 Created"
    assert res.headers["Location"] == res.request.url


def test_put_twice(app, token):
    res = app.put(
        "/test_key",
        "Hello, World!",
        headers={"Content-Type": "text/plain", "Authorization": f"APIKey {token}"},
    )
    assert res.status == "201 Created"
    assert res.headers["Location"] == res.request.url
    res = app.put(
        "/test_key",
        "Hello, World!",
        headers={"Content-Type": "text/plain", "Authorization": f"APIKey {token}"},
    )
    assert res.status == "204 No Content"
    assert res.headers["Location"] == res.request.url


@pytest.mark.parametrize("method", ["get", "head", "delete"])
def test_method_nonexistent_fails(app, method, token):
    headers = {}
    if method == "delete":
        headers = {"Authorization": f"APIKey {token}"}
    res = getattr(app, method)("/test_key", headers=headers, expect_errors=True)
    assert res.status == "404 Not Found"


def test_put_then_get_then_head(app, token):
    BODY = "Hello, World!"
    res = app.put(
        "/test_key",
        BODY,
        headers={"Content-Type": "text/plain", "Authorization": f"APIKey {token}"},
    )
    assert res.status == "201 Created"
    assert res.headers["Location"] == res.request.url
    etag = res.headers["ETag"]
    res = app.get("/test_key")
    assert res.status == "200 OK"
    assert res.headers["ETag"] == etag
    assert res.text == BODY
    res = app.head("/test_key")
    assert res.status == "200 OK"
    assert res.headers["ETag"] == etag
    assert res.text == ""


def test_if_none_match(app, token):
    res = app.put(
        "/test_key",
        "Hello, World!",
        headers={"Content-Type": "text/plain", "Authorization": f"APIKey {token}"},
    )
    assert res.status == "201 Created"
    assert res.headers["Location"] == res.request.url
    etag = res.headers["ETag"]
    res = app.get("/test_key", headers={"If-None-Match": etag})
    assert res.status == "304 Not Modified"
    assert res.headers["ETag"] == etag


def test_if_none_match_other_etag(app, token):
    BODY = "Hello, World!"
    res = app.put(
        "/test_key",
        BODY,
        headers={"Content-Type": "text/plain", "Authorization": f"APIKey {token}"},
    )
    assert res.status == "201 Created"
    assert res.headers["Location"] == res.request.url
    etag = res.headers["ETag"]
    res = app.get("/test_key", headers={"If-None-Match": '"not a real etag"'})
    assert res.status == "200 OK"
    assert res.headers["ETag"] == etag
    assert res.text == BODY


def test_if_none_match_malformed_etag(app, token):
    res = app.put(
        "/test_key",
        "Hello, World!",
        headers={"Content-Type": "text/plain", "Authorization": f"APIKey {token}"},
    )
    assert res.status == "201 Created"
    assert res.headers["Location"] == res.request.url
    res = app.get(
        "/test_key", headers={"If-None-Match": "malformed"}, expect_errors=True
    )
    assert res.status == "400 Bad Request"


@pytest.mark.parametrize(
    "etags",
    [
        [None, "a"],
        ["a", None],
        [None, "a", "b"],
        ["a", None, "b"],
        ["a", "b", None],
    ],
)
def test_if_none_match_list(app, etags, token):
    res = app.put(
        "/test_key",
        "Hello, World!",
        headers={"Content-Type": "text/plain", "Authorization": f"APIKey {token}"},
    )
    assert res.status == "201 Created"
    assert res.headers["Location"] == res.request.url
    etag = res.headers["ETag"]
    etags_str = ", ".join(f'"{e}"' if e else etag for e in etags)
    res = app.get("/test_key", headers={"If-None-Match": etags_str})
    assert res.status == "304 Not Modified"
    assert res.headers["ETag"] == etag


def test_put_update(app, token):
    res = app.put(
        "/test_key",
        "Hello, World!",
        headers={"Content-Type": "text/plain", "Authorization": f"APIKey {token}"},
    )
    assert res.status == "201 Created"
    assert res.headers["Location"] == res.request.url
    etag = res.headers["ETag"]
    res = app.put(
        "/test_key",
        "Hello, Updated World!",
        headers={"Content-Type": "text/plain", "Authorization": f"APIKey {token}"},
    )
    assert res.status == "204 No Content"
    assert res.headers["ETag"] != etag
    res = app.get("/test_key")
    assert res.status == "200 OK"
    assert res.text == "Hello, Updated World!"


def test_delete(app, token):
    res = app.put(
        "/test_key",
        "Hello, World!",
        headers={"Content-Type": "text/plain", "Authorization": f"APIKey {token}"},
    )
    assert res.status == "201 Created"
    assert res.headers["Location"] == res.request.url
    res = app.delete("/test_key", expect_errors=True)
    assert res.status == "401 Unauthorized"
    res = app.delete("/test_key", headers={"Authorization": f"APIKey {token}"})
    assert res.status == "204 No Content"
    res = app.delete(
        "/test_key", headers={"Authorization": f"APIKey {token}"}, expect_errors=True
    )
    assert res.status == "404 Not Found"


def test_post(app, token):
    res = app.post(
        "/test_key",
        "Hello, World!",
        headers={"Content-Type": "text/plain", "Authorization": f"APIKey {token}"},
    )
    assert res.status == "201 Created"
    assert res.headers["Location"] != res.request.url
    print(res.headers["Location"])
    print(res.request.url)
    assert res.headers["Location"].startswith(res.request.url)
    etag = res.headers["ETag"]
    res = app.get(res.headers["Location"])
    assert res.status == "200 OK"
    assert res.headers["ETag"] == etag