Added is_signed(), parse_changes(), verify_signature().

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>

pydebsign/debsign.py

@@ -12,6 +12,7 @@
 """
 import hashlib
 import gnupg
+import deb822
 
 
 class Debsign(object):
@@ -24,14 +25,20 @@ def is_signed(self, file_path):
         Returns: `bool` True is signed, False is unsigned.
         :param file_path: expecting .dsc file or .changes file.
         """
-        pass
+        with open(file_path, 'rb') as fileobj:
+            if self.gpg.verify(fileobj.read()).status is None:
+                return False
+            else:
+                return True
 
     def parse_changes(self, changes_path):
         """ parse .changes and retrieve efile size and file name list.
         Returns: file list with file size and checksums.
         :param changes_path: .changes file path
         """
-        pass
+        with open(changes_path, 'rb') as fileobj:
+            changes = deb822.Changes(fileobj)
+        return [_file for _file in changes['Files']]
 
     def retrieve_dsc_path(self, file_list):
         """ retrieve dsc file path from file list.
@@ -103,7 +110,8 @@ def verify_signature(self, file_path):
         Returns: `bool` True is valid, False is invalid
         :param file_path: expecting .dsc file path or .changes file path
         """
-        pass
+        with open(file_path) as fileobj:
+            return self.gpg.verify(fileobj.read()).valid
 
     def verify_with_dput(self, changes_path):
         """ verify .changes and .dsc files with `dput` command.

requirements.txt

@@ -1 +1,2 @@
 python_gnupg
+python_debian

setup.py

@@ -46,7 +46,8 @@ def run_tests(self):
     open(os.path.join("docs", "TODO.rst")).read())
 
 requires = ['setuptools',
-            'python_gnupg']
+            'python_gnupg',
+            'python_debian']
 
 setup(name='pydebsign',
       version='0.1.0',

tox.ini

@@ -9,6 +9,7 @@ commands =
 [py]
 deps=
         python_gnupg
+        python_debian
 		pep8
 		coverage
         pytest