diff options
Diffstat (limited to 'src/cow_http_hd.erl')
| -rw-r--r-- | src/cow_http_hd.erl | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/src/cow_http_hd.erl b/src/cow_http_hd.erl index 848b8c9..bd0a258 100644 --- a/src/cow_http_hd.erl +++ b/src/cow_http_hd.erl @@ -32,6 +32,7 @@ -export([parse_etag/1]). -export([parse_expect/1]). -export([parse_expires/1]). +-export([parse_host/1]). -export([parse_if_match/1]). -export([parse_if_modified_since/1]). -export([parse_if_none_match/1]). @@ -1846,6 +1847,96 @@ horse_parse_expires_invalid() -> ). -endif. +%% @doc Parse the Host header. +%% +%% We only seek to have legal characters and separate the +%% host and port values. The number of segments in the host +%% or the size of each segment is not checked. +%% +%% There is no way to distinguish IPv4 addresses from regular +%% names until the last segment is reached therefore we do not +%% differentiate them. +%% +%% The following valid hosts are currently rejected: IPv6 +%% addresses with a zone identifier; IPvFuture addresses; +%% and percent-encoded addresses. + +-spec parse_host(binary()) -> {binary(), 0..65535 | undefined}. +parse_host(<< $[, R/bits >>) -> + ipv6_address(R, << $[ >>); +parse_host(Host) -> + reg_name(Host, <<>>). + +ipv6_address(<< $] >>, IP) -> {<< IP/binary, $] >>, undefined}; +ipv6_address(<< $], $:, Port/bits >>, IP) -> {<< IP/binary, $] >>, binary_to_integer(Port)}; +ipv6_address(<< C, R/bits >>, IP) when ?IS_HEX(C) orelse C =:= $: orelse C =:= $. -> + case C of + ?INLINE_LOWERCASE(ipv6_address, R, IP) + end. + +reg_name(<<>>, Name) -> {Name, undefined}; +reg_name(<< $:, Port/bits >>, Name) -> {Name, binary_to_integer(Port)}; +reg_name(<< C, R/bits >>, Name) when ?IS_URI_UNRESERVED(C) orelse ?IS_URI_SUB_DELIMS(C) -> + case C of + ?INLINE_LOWERCASE(reg_name, R, Name) + end. + +-ifdef(TEST). +host_chars() -> "!$&'()*+,-.0123456789;=ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz~". +host() -> vector(1, 255, elements(host_chars())). + +host_port() -> + ?LET({Host, Port}, + {host(), oneof([undefined, int(1, 65535)])}, + begin + HostBin = list_to_binary(Host), + {{?INLINE_LOWERCASE_BC(HostBin), Port}, + case Port of + undefined -> HostBin; + _ -> << HostBin/binary, $:, (integer_to_binary(Port))/binary >> + end} + end). + +prop_parse_host() -> + ?FORALL({Res, Host}, host_port(), Res =:= parse_host(Host)). + +parse_host_test_() -> + Tests = [ + {<<>>, {<<>>, undefined}}, + {<<"www.example.org:8080">>, {<<"www.example.org">>, 8080}}, + {<<"www.example.org">>, {<<"www.example.org">>, undefined}}, + {<<"192.0.2.1:8080">>, {<<"192.0.2.1">>, 8080}}, + {<<"192.0.2.1">>, {<<"192.0.2.1">>, undefined}}, + {<<"[2001:db8::1]:8080">>, {<<"[2001:db8::1]">>, 8080}}, + {<<"[2001:db8::1]">>, {<<"[2001:db8::1]">>, undefined}}, + {<<"[::ffff:192.0.2.1]:8080">>, {<<"[::ffff:192.0.2.1]">>, 8080}}, + {<<"[::ffff:192.0.2.1]">>, {<<"[::ffff:192.0.2.1]">>, undefined}} + ], + [{V, fun() -> R = parse_host(V) end} || {V, R} <- Tests]. +-endif. + +-ifdef(PERF). +horse_parse_host_blue_example_org() -> + horse:repeat(200000, + parse_host(<<"blue.example.org:8080">>) + ). + +horse_parse_host_ipv4() -> + horse:repeat(200000, + parse_host(<<"192.0.2.1:8080">>) + ). + +horse_parse_host_ipv6() -> + horse:repeat(200000, + parse_host(<<"[2001:db8::1]:8080">>) + ). + +horse_parse_host_ipv6_v4() -> + horse:repeat(200000, + parse_host(<<"[::ffff:192.0.2.1]:8080">>) + ). +-endif. + %% @doc Parse the If-Match header. -spec parse_if_match(binary()) -> '*' | [etag()]. |