fixing statics server so it's possible to use with python 3.6

pype/services/statics_server/statics_server.py

@@ -1,6 +1,8 @@
 import os
 import socket
 import http.server
+import urllib
+import posixpath
 import socketserver
 
 from Qt import QtCore
@@ -11,8 +13,118 @@ DIRECTORY = os.path.sep.join([os.environ['PYPE_MODULE_ROOT'], 'res'])
 
 
 class Handler(http.server.SimpleHTTPRequestHandler):
+    directory=DIRECTORY
     def __init__(self, *args, **kwargs):
-        super().__init__(*args, directory=DIRECTORY, **kwargs)
+        super().__init__(*args, **kwargs)
+
+    def send_head(self):
+        """Common code for GET and HEAD commands.
+
+        This sends the response code and MIME headers.
+
+        Return value is either a file object (which has to be copied
+        to the outputfile by the caller unless the command was HEAD,
+        and must be closed by the caller under all circumstances), or
+        None, in which case the caller has nothing further to do.
+
+        """
+        path = self.translate_path(self.path)
+        f = None
+        if os.path.isdir(path):
+            parts = urllib.parse.urlsplit(self.path)
+            if not parts.path.endswith('/'):
+                # redirect browser - doing basically what apache does
+                self.send_response(HTTPStatus.MOVED_PERMANENTLY)
+                new_parts = (parts[0], parts[1], parts[2] + '/',
+                             parts[3], parts[4])
+                new_url = urllib.parse.urlunsplit(new_parts)
+                self.send_header("Location", new_url)
+                self.end_headers()
+                return None
+            for index in "index.html", "index.htm":
+                index = os.path.join(path, index)
+                if os.path.exists(index):
+                    path = index
+                    break
+            else:
+                return self.list_directory(path)
+        ctype = self.guess_type(path)
+        try:
+            f = open(path, 'rb')
+        except OSError:
+            self.send_error(HTTPStatus.NOT_FOUND, "File not found")
+            return None
+
+        try:
+            fs = os.fstat(f.fileno())
+            # Use browser cache if possible
+            if ("If-Modified-Since" in self.headers
+                    and "If-None-Match" not in self.headers):
+                # compare If-Modified-Since and time of last file modification
+                try:
+                    ims = email.utils.parsedate_to_datetime(
+                        self.headers["If-Modified-Since"])
+                except (TypeError, IndexError, OverflowError, ValueError):
+                    # ignore ill-formed values
+                    pass
+                else:
+                    if ims.tzinfo is None:
+                        # obsolete format with no timezone, cf.
+                        # https://tools.ietf.org/html/rfc7231#section-7.1.1.1
+                        ims = ims.replace(tzinfo=datetime.timezone.utc)
+                    if ims.tzinfo is datetime.timezone.utc:
+                        # compare to UTC datetime of last modification
+                        last_modif = datetime.datetime.fromtimestamp(
+                            fs.st_mtime, datetime.timezone.utc)
+                        # remove microseconds, like in If-Modified-Since
+                        last_modif = last_modif.replace(microsecond=0)
+
+                        if last_modif <= ims:
+                            self.send_response(HTTPStatus.NOT_MODIFIED)
+                            self.end_headers()
+                            f.close()
+                            return None
+
+            self.send_response(HTTPStatus.OK)
+            self.send_header("Content-type", ctype)
+            self.send_header("Content-Length", str(fs[6]))
+            self.send_header("Last-Modified",
+                self.date_time_string(fs.st_mtime))
+            self.end_headers()
+            return f
+        except:
+            f.close()
+            raise
+
+    def translate_path(self, path):
+        """Translate a /-separated PATH to the local filename syntax.
+
+        Components that mean special things to the local file system
+        (e.g. drive or directory names) are ignored.  (XXX They should
+        probably be diagnosed.)
+
+        """
+        # abandon query parameters
+        path = path.split('?',1)[0]
+        path = path.split('#',1)[0]
+        # Don't forget explicit trailing slash when normalizing. Issue17324
+        trailing_slash = path.rstrip().endswith('/')
+        try:
+            path = urllib.parse.unquote(path, errors='surrogatepass')
+        except UnicodeDecodeError:
+            path = urllib.parse.unquote(path)
+        path = posixpath.normpath(path)
+        words = path.split('/')
+        words = filter(None, words)
+        path = self.directory
+        for word in words:
+            if os.path.dirname(word) or word in (os.curdir, os.pardir):
+                # Ignore components that are not a simple file/directory name
+                continue
+            path = os.path.join(path, word)
+        if trailing_slash:
+            path += '/'
+        return path
 
 
 class StaticsServer(QtCore.QThread):