unikernel/duniverse/httpun/lib/message.ml

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+(*----------------------------------------------------------------------------
+    Copyright (c) 2017 Inhabited Type LLC.
+
+    All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    3. Neither the name of the author nor the names of his contributors
+       may be used to endorse or promote products derived from this software
+       without specific prior written permission.
+
+    THIS SOFTWARE IS PROVIDED BY THE CONTRIBUTORS ``AS IS'' AND ANY EXPRESS
+    OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+    WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+    DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
+    ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+    OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+    HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+    STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+    ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+    POSSIBILITY OF SUCH DAMAGE.
+  ----------------------------------------------------------------------------*)
+
+
+(* This module contains functionality that applies to both requests and
+   responses, which are collectively referred to in the HTTP 1.1 specifications
+   as 'messages'. *)
+
+let persistent_connection ?(proxy=false) version headers =
+  let _ = proxy in
+  (* XXX(seliopou): use proxy argument in the case of HTTP/1.0 as per
+     https://tools.ietf.org/html/rfc7230#section-6.3 *)
+  match Headers.get headers "connection" with
+  | Some "close"      -> false
+  | Some "keep-alive" -> Version.(compare version v1_0) >= 0
+  | _                 -> Version.(compare version v1_1) >= 0
+
+let sort_uniq xs =
+  (* Though {!List.sort_uniq} performs a check on the input length and returns
+   * immediately for lists of length less than [2], it still allocates closures
+   * before it does that check! To avoid that just do our own checking here to
+   * avoid the allocations in the common case. *)
+  match xs with
+  | [] | [ _ ] -> xs
+  | _          -> List.sort_uniq String.compare xs
+
+let unique_content_length_values headers =
+  (* XXX(seliopou): perform proper content-length parsing *)
+  sort_uniq (Headers.get_multi headers "content-length")
+
+let content_length_of_string s =
+  try Int64.of_string s with _ -> -1L