Add support for range requests (RFC7233) in cowboy_rest

This is currently undocumented but is planned to be documented
in the next version.

1 files changed, 46 insertions, 0 deletions

diff --git a/test/handlers/if_range_h.erl b/test/handlers/if_range_h.erl
new file mode 100644
index 0000000..868edbf
--- /dev/null
+++ b/test/handlers/if_range_h.erl
@@ -0,0 +1,46 @@
+%% This module defines the ranges_provided callback
+%% and a generate_etag callback that returns something
+%% different depending on query string. It also defines
+%% a last_modified callback that must be ignored when a
+%% date is provided in if_range.
+
+-module(if_range_h).
+
+-export([init/2]).
+-export([content_types_provided/2]).
+-export([ranges_provided/2]).
+-export([generate_etag/2]).
+-export([last_modified/2]).
+-export([get_text_plain/2]).
+-export([get_text_plain_bytes/2]).
+
+init(Req, State) ->
+	{cowboy_rest, Req, State}.
+
+content_types_provided(Req, State) ->
+	{[{{<<"text">>, <<"plain">>, []}, get_text_plain}], Req, State}.
+
+%% Simulate the callback being missing.
+ranges_provided(#{qs := <<"missing-ranges_provided">>}, _) ->
+	no_call;
+ranges_provided(Req=#{qs := <<"empty-ranges_provided">>}, State) ->
+	{[], Req, State};
+ranges_provided(Req, State) ->
+	{[{<<"bytes">>, get_text_plain_bytes}], Req, State}.
+
+generate_etag(Req=#{qs := <<"weak-etag">>}, State) ->
+	{{weak, <<"weak-no-match">>}, Req, State};
+generate_etag(Req, State) ->
+	{{strong, <<"strong-and-match">>}, Req, State}.
+
+last_modified(Req, State) ->
+	{{{2222, 2, 22}, {11, 11, 11}}, Req, State}.
+
+get_text_plain(Req, State) ->
+	{<<"This is REST!">>, Req, State}.
+
+get_text_plain_bytes(Req, State) ->
+	%% We send everything in one part, since we are not testing
+	%% this callback specifically.
+	Body = <<"This is ranged REST!">>,
+	{[{{0, byte_size(Body) - 1, byte_size(Body)}, Body}], Req, State}.