python-werkzeug/tests/test_security.py

import os
import posixpath
import sys

import pytest

from werkzeug.security import check_password_hash
from werkzeug.security import generate_password_hash
from werkzeug.security import safe_join


def test_default_password_method():
    value = generate_password_hash("secret")
    assert value.startswith("scrypt:")


@pytest.mark.xfail(
    sys.implementation.name == "pypy", reason="scrypt unavailable on pypy"
)
def test_scrypt():
    value = generate_password_hash("secret", method="scrypt")
    assert check_password_hash(value, "secret")
    assert value.startswith("scrypt:32768:8:1$")


def test_pbkdf2():
    value = generate_password_hash("secret", method="pbkdf2")
    assert check_password_hash(value, "secret")
    assert value.startswith("pbkdf2:sha256:600000$")


def test_salted_hashes():
    hash1 = generate_password_hash("secret")
    hash2 = generate_password_hash("secret")
    assert hash1 != hash2
    assert check_password_hash(hash1, "secret")
    assert check_password_hash(hash2, "secret")


def test_require_salt():
    with pytest.raises(ValueError):
        generate_password_hash("secret", salt_length=0)


def test_invalid_method():
    with pytest.raises(ValueError, match="Invalid hash method"):
        generate_password_hash("secret", "sha256")


def test_safe_join():
    assert safe_join("foo", "bar/baz") == posixpath.join("foo", "bar/baz")
    assert safe_join("foo", "../bar/baz") is None
    if os.name == "nt":
        assert safe_join("foo", "foo\\bar") is None


def test_safe_join_os_sep():
    import werkzeug.security as sec

    prev_value = sec._os_alt_seps
    sec._os_alt_seps = "*"
    assert safe_join("foo", "bar/baz*") is None
    sec._os_alt_steps = prev_value


def test_safe_join_empty_trusted():
    assert safe_join("", "c:test.txt") == "./c:test.txt"