Update request signing to work for any content type

.travis.yml

@@ -4,7 +4,6 @@ language: python
 python:
   - "2.7.6"
   - "2.7"
-  - "3.3"
   - "3.4"
   - "3.5"
   - "3.6"

requirements-dev.txt

@@ -2,7 +2,7 @@ coveralls==1.1
 ipdb==0.9.3
 ipython==4.1.2
 pdbpp==0.8.3
-pytest>=3.2.0
+pytest>=3.2.0,<4.0.0
 pytest-flask==0.10.0
 pytest-mock>=1.6.3
 pytest-cov==2.5.1

slackeventsapi/server.py

@@ -53,7 +53,7 @@ def verify_signature(self, timestamp, signature):
         # It's recommended to use Python 2.7.7+
         # noqa See https://docs.python.org/2/whatsnew/2.7.html#pep-466-network-security-enhancements-for-python-2-7
         if hasattr(hmac, "compare_digest"):
-            req = str.encode('v0:' + str(timestamp) + ':') + request.data
+            req = str.encode('v0:' + str(timestamp) + ':') + request.get_data()
             request_hash = 'v0=' + hmac.new(
                 str.encode(self.signing_secret),
                 req, hashlib.sha256
@@ -65,7 +65,7 @@ def verify_signature(self, timestamp, signature):
                 return hmac.compare_digest(request_hash, signature)
         else:
             # So, we'll compare the signatures explicitly
-            req = str.encode('v0:' + str(timestamp) + ':') + request.data
+            req = str.encode('v0:' + str(timestamp) + ':') + request.get_data()
             request_hash = 'v0=' + hmac.new(
                 str.encode(self.signing_secret),
                 req, hashlib.sha256

tox.ini

@@ -4,7 +4,7 @@
 ; for quality analysis, use `tox -e flake8` or just `flake8 slackeventsapi`
 ; to build the docs, use `tox -e docs`
 envlist=
-    py{276,27,33,34,35,36},
+    py{276,27,34,35,36},
     flake8,
     docs