1 files changed, 64 insertions, 0 deletions
diff --git a/third_party/dnspython/dns/ttl.py b/third_party/dnspython/dns/ttl.py
new file mode 100644
index 0000000000..ab6ddf4e66
--- /dev/null
+++ b/third_party/dnspython/dns/ttl.py
@@ -0,0 +1,64 @@
+# Copyright (C) 2003-2007, 2009-2011 Nominum, Inc.
+#
+# Permission to use, copy, modify, and distribute this software and its
+# documentation for any purpose with or without fee is hereby granted,
+# provided that the above copyright notice and this permission notice
+# appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+"""DNS TTL conversion."""
+
+import dns.exception
+
+class BadTTL(dns.exception.SyntaxError):
+    pass
+
+def from_text(text):
+    """Convert the text form of a TTL to an integer.
+
+    The BIND 8 units syntax for TTLs (e.g. '1w6d4h3m10s') is supported.
+
+    @param text: the textual TTL
+    @type text: string
+    @raises dns.ttl.BadTTL: the TTL is not well-formed
+    @rtype: int
+    """
+
+    if text.isdigit():
+        total = long(text)
+    else:
+        if not text[0].isdigit():
+            raise BadTTL
+        total = 0L
+        current = 0L
+        for c in text:
+            if c.isdigit():
+                current *= 10
+                current += long(c)
+            else:
+                c = c.lower()
+                if c == 'w':
+                    total += current * 604800L
+                elif c == 'd':
+                    total += current * 86400L
+                elif c == 'h':
+                    total += current * 3600L
+                elif c == 'm':
+                    total += current * 60L
+                elif c == 's':
+                    total += current
+                else:
+                    raise BadTTL("unknown unit '%s'" % c)
+                current = 0
+        if not current == 0:
+            raise BadTTL("trailing integer")
+    if total < 0L or total > 2147483647L:
+        raise BadTTL("TTL should be between 0 and 2^31 - 1 (inclusive)")
+    return total