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-rw-r--r--src/cow_http_hd.erl76
1 files changed, 61 insertions, 15 deletions
diff --git a/src/cow_http_hd.erl b/src/cow_http_hd.erl
index aaec21d..527f0a6 100644
--- a/src/cow_http_hd.erl
+++ b/src/cow_http_hd.erl
@@ -22,6 +22,7 @@
-export([parse_content_length/1]).
-export([parse_content_type/1]).
-export([parse_date/1]).
+-export([parse_etag/1]).
-export([parse_expect/1]).
-export([parse_if_match/1]).
-export([parse_if_modified_since/1]).
@@ -965,6 +966,66 @@ parse_date_test_() ->
[{V, fun() -> R = parse_date(V) end} || {V, R} <- Tests].
-endif.
+%% @doc Parse the ETag header.
+
+-spec parse_etag(binary()) -> etag().
+parse_etag(<< $W, $/, $", R/bits >>) ->
+ etag(R, weak, <<>>);
+parse_etag(<< $", R/bits >>) ->
+ etag(R, strong, <<>>).
+
+etag(<< $", R/bits >>, Strength, Tag) ->
+ ws_end(R),
+ {Strength, Tag};
+etag(<< C, R/bits >>, Strength, Tag) when ?IS_ETAGC(C) ->
+ etag(R, Strength, << Tag/binary, C >>).
+
+-ifdef(TEST).
+etagc() ->
+ ?SUCHTHAT(C, int(16#21, 16#ff), C =/= 16#22 andalso C =/= 16#7f).
+
+etag() ->
+ ?LET({Strength, Tag},
+ {oneof([weak, strong]), list(etagc())},
+ begin
+ TagBin = list_to_binary(Tag),
+ {{Strength, TagBin},
+ case Strength of
+ weak -> << $W, $/, $", TagBin/binary, $" >>;
+ strong -> << $", TagBin/binary, $" >>
+ end}
+ end).
+
+prop_parse_etag() ->
+ ?FORALL({Tag, TagBin},
+ etag(),
+ Tag =:= parse_etag(TagBin)).
+
+parse_etag_test_() ->
+ Tests = [
+ {<<"\"xyzzy\"">>, {strong, <<"xyzzy">>}},
+ {<<"W/\"xyzzy\"">>, {weak, <<"xyzzy">>}},
+ {<<"\"\"">>, {strong, <<>>}}
+ ],
+ [{V, fun() -> R = parse_etag(V) end} || {V, R} <- Tests].
+
+parse_etag_error_test_() ->
+ Tests = [
+ <<>>,
+ <<"\"">>,
+ <<"W">>,
+ <<"W/">>
+ ],
+ [{V, fun() -> {'EXIT', _} = (catch parse_etag(V)) end} || V <- Tests].
+-endif.
+
+-ifdef(PERF).
+horse_parse_etag() ->
+ horse:repeat(200000,
+ parse_etag(<<"W/\"xyzzy\"">>)
+ ).
+-endif.
+
%% @doc Parse the Expect header.
-spec parse_expect(binary()) -> continue.
@@ -1042,21 +1103,6 @@ etag_list_sep(<< $\t, R/bits >>, Acc) -> etag_list_sep(R, Acc);
etag_list_sep(<< $,, R/bits >>, Acc) -> etag_list(R, Acc).
-ifdef(TEST).
-etagc() ->
- ?SUCHTHAT(C, int(16#21, 16#ff), C =/= 16#22 andalso C =/= 16#7f).
-
-etag() ->
- ?LET({Strength, Tag},
- {oneof([weak, strong]), list(etagc())},
- begin
- TagBin = list_to_binary(Tag),
- {{Strength, TagBin},
- case Strength of
- weak -> << $W, $/, $", TagBin/binary, $" >>;
- strong -> << $", TagBin/binary, $" >>
- end}
- end).
-
prop_parse_if_match() ->
?FORALL(L,
non_empty(list(etag())),