1 files changed, 47 insertions, 0 deletions
diff --git a/urllib3/packages/mimetools_choose_boundary/__init__.py b/urllib3/packages/mimetools_choose_boundary/__init__.py
new file mode 100644
index 0000000..a0109ab
--- /dev/null
+++ b/urllib3/packages/mimetools_choose_boundary/__init__.py
@@ -0,0 +1,47 @@
+"""The function mimetools.choose_boundary() from Python 2.7, which seems to
+have disappeared in Python 3 (although email.generator._make_boundary() might
+work as a replacement?).
+
+Tweaked to use lock from threading rather than thread.
+"""
+import os
+from threading import Lock
+_counter_lock = Lock()
+
+_counter = 0
+def _get_next_counter():
+    global _counter
+    with _counter_lock:
+        _counter += 1
+        return _counter
+
+_prefix = None
+
+def choose_boundary():
+    """Return a string usable as a multipart boundary.
+
+    The string chosen is unique within a single program run, and
+    incorporates the user id (if available), process id (if available),
+    and current time.  So it's very unlikely the returned string appears
+    in message text, but there's no guarantee.
+
+    The boundary contains dots so you have to quote it in the header."""
+
+    global _prefix
+    import time
+    if _prefix is None:
+        import socket
+        try:
+            hostid = socket.gethostbyname(socket.gethostname())
+        except socket.gaierror:
+            hostid = '127.0.0.1'
+        try:
+            uid = repr(os.getuid())
+        except AttributeError:
+            uid = '1'
+        try:
+            pid = repr(os.getpid())
+        except AttributeError:
+            pid = '1'
+        _prefix = hostid + '.' + uid + '.' + pid
+    return "%s.%.3f.%d" % (_prefix, time.time(), _get_next_counter())