Remove Python 2.7 compatibility (#457)

* Remove py27 support

* [py27] Remove useless compatibility files

.travis.yml

@@ -1,17 +1,12 @@
 language: python
 matrix:
   include:
-    - python: 2.7
-      env: TOXENV=py27-crypto,py27-nocrypto,py27-contrib_crypto
-    - python: 3.4
-      env: TOXENV=py34-crypto,py34-nocrypto
     - python: 3.5
       env: TOXENV=py35-crypto,py35-nocrypto,py35-contrib_crypto
     - python: 3.6
       env: TOXENV=py36-crypto,py36-nocrypto,py36-contrib_crypto
     - python: 3.7
       env: TOXENV=lint,typing,py37-crypto,py37-nocrypto,py37-contrib_crypto
-      dist: xenial
 install:
   - pip install -U pip
   - pip install -U tox coveralls

appveyor.yml

@@ -1,11 +1,14 @@
 environment:
   matrix:
-    - PYTHON: "C:\\Python27-x64"
-      TOX_ENV: "py27-crypto"
-
     - PYTHON: "C:\\Python35-x64"
       TOX_ENV: "py35-crypto"
 
+    - PYTHON: "C:\\Python36-x64"
+      TOX_ENV: "py36-crypto"
+
+    - PYTHON: "C:\\Python37-x64"
+      TOX_ENV: "py37-crypto"
+
 init:
   - SET PATH=%PYTHON%;%PATH%
   - python -c "import sys;sys.stdout.write(sys.version)"

jwt/__main__.py

@@ -1,6 +1,4 @@
-#!/usr/bin/env python
-
-from __future__ import absolute_import, print_function
+#!/usr/bin/env python3
 
 import argparse
 import json

jwt/compat.py

@@ -4,69 +4,27 @@
 """
 # flake8: noqa
 import hmac
-import struct
-import sys
 
-PY3 = sys.version_info[0] == 3
-
-
-if PY3:
-    text_type = str
-    binary_type = bytes
-else:
-    text_type = unicode
-    binary_type = str
-
-string_types = (text_type, binary_type)
+text_type = str
+binary_type = bytes
+string_types = (str, bytes)
 
 try:
     # Importing ABCs from collections will be removed in PY3.8
     from collections.abc import Iterable, Mapping
 except ImportError:
     from collections import Iterable, Mapping
 
-try:
-    constant_time_compare = hmac.compare_digest
-except AttributeError:
-    # Fallback for Python < 2.7
-    def constant_time_compare(val1, val2):
-        """
-        Returns True if the two strings are equal, False otherwise.
-
-        The time taken is independent of the number of characters that match.
-        """
-        if len(val1) != len(val2):
-            return False
-
-        result = 0
-
-        for x, y in zip(val1, val2):
-            result |= ord(x) ^ ord(y)
-
-        return result == 0
-
-
-# Use int.to_bytes if it exists (Python 3)
-if getattr(int, "to_bytes", None):
-
-    def bytes_from_int(val):
-        remaining = val
-        byte_length = 0
-
-        while remaining != 0:
-            remaining = remaining >> 8
-            byte_length += 1
 
-        return val.to_bytes(byte_length, "big", signed=False)
+constant_time_compare = hmac.compare_digest
 
 
-else:
+def bytes_from_int(val):
+    remaining = val
+    byte_length = 0
 
-    def bytes_from_int(val):
-        buf = []
-        while val:
-            val, remainder = divmod(val, 256)
-            buf.append(remainder)
+    while remaining != 0:
+        remaining = remaining >> 8
+        byte_length += 1
 
-        buf.reverse()
-        return struct.pack("%sB" % len(buf), *buf)
+    return val.to_bytes(byte_length, "big", signed=False)

setup.py

@@ -1,5 +1,5 @@
-#!/usr/bin/env python
-# -*- coding: utf-8 -*-
+#!/usr/bin/env python3
+
 import os
 import re
 import sys
@@ -60,14 +60,13 @@ def get_version(package):
         "Natural Language :: English",
         "License :: OSI Approved :: MIT License",
         "Programming Language :: Python",
-        "Programming Language :: Python :: 2.7",
-        "Programming Language :: Python :: 3.4",
+        "Programming Language :: Python :: 3",
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
         "Topic :: Utilities",
     ],
-    python_requires=">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*",
+    python_requires=">=3, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*",
     extras_require=EXTRAS_REQUIRE,
     entry_points={"console_scripts": ["pyjwt = jwt.__main__:main"]},
     options={"bdist_wheel": {"universal": "1"}},

tests/test_api_jws.py

@@ -13,8 +13,6 @@
 )
 from jwt.utils import base64url_decode, force_bytes, force_unicode
 
-from .compat import string_types, text_type
-
 try:
     from cryptography.hazmat.backends import default_backend
     from cryptography.hazmat.primitives.serialization import (
@@ -107,7 +105,7 @@ def test_decode_fails_when_alg_is_not_on_method_algorithms_param(
 
     def test_decode_works_with_unicode_token(self, jws):
         secret = "secret"
-        unicode_jws = text_type(
+        unicode_jws = (
             "eyJhbGciOiAiSFMyNTYiLCAidHlwIjogIkpXVCJ9"
             ".eyJoZWxsbyI6ICJ3b3JsZCJ9"
             ".tvagLDLoaiJKxOKqpBXSEGy7SYSifZhjntgm9ctpyj8"
@@ -732,13 +730,13 @@ def test_encode_headers_parameter_adds_headers(self, jws, payload):
         headers = {"testheader": True}
         token = jws.encode(payload, "secret", headers=headers)
 
-        if not isinstance(token, string_types):
+        if not isinstance(token, str):
             token = token.decode()
 
         header = token[0 : token.index(".")].encode()
         header = base64url_decode(header)
 
-        if not isinstance(header, text_type):
+        if not isinstance(header, str):
             header = header.decode()
 
         header_obj = json.loads(header)

tox.ini

@@ -1,5 +1,10 @@
 [tox]
-envlist = lint, typing, py{27,34,35,36,37}-crypto, py{27,35,36,37}-contrib_crypto, py{27,35,36,37}-nocrypto
+envlist =
+    lint
+    typing
+    py{35,36,37}-crypto
+    py{35,36,37}-contrib_crypto
+    py{35,36,37}-nocrypto
 
 
 [testenv]