Added sha1_filecheck

openlp/core/common/__init__.py

@@ -190,6 +190,32 @@ def verify_ip_address(addr):
     return True if verify_ipv4(addr) else verify_ipv6(addr)
 
 
+def sha1_filecheck(input_file, check):
+    """
+    Validate a downloaded file has the same SHA1 as recorded.
+
+    :param input_file: File to test
+    :param check: MD5Sum to validate
+    :return: File MD5 == check
+    """
+    log.debug('sha1_filecheck(file="{}", check="{}"'.format(input_file, check))
+    try:
+        file_ = open(input_file, 'rb')
+    except OSError as err:
+        log.error('Unable to check "{}"'.format(input_file))
+        log.error('Error code: {}'.format(err.errno))
+        log.error('Error msg:  {}'.format(err.strerror))
+        return False
+    hash_obj = hashlib.new('sha1')
+    while True:
+        data = file_.read(1024)
+        if not data:
+            break
+        hash_obj.update(data)
+    log.debug('sha1_filecheck validating "{}"'.format(hash_obj.hexdigest()))
+    return hash_obj.hexdigest() == check
+
+
 def md5_filecheck(input_file, check):
     """
     Validate a downloaded file has the same MD5 as recorded.