580 lines
18 KiB
Erlang
580 lines
18 KiB
Erlang
%% @author Bob Ippolito <bob@mochimedia.com>
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%% @copyright 2007 Mochi Media, Inc.
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%% @doc Utilities for parsing and quoting.
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-module(mochiweb_util).
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-author('bob@mochimedia.com').
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-export([join/2, quote_plus/1, urlencode/1, parse_qs/1, unquote/1]).
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-export([path_split/1]).
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-export([urlsplit/1, urlsplit_path/1, urlunsplit/1, urlunsplit_path/1]).
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-export([guess_mime/1, parse_header/1]).
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-export([shell_quote/1, cmd/1, cmd_string/1, cmd_port/2]).
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-export([record_to_proplist/2, record_to_proplist/3]).
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-export([safe_relative_path/1, partition/2]).
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-export([test/0]).
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-define(PERCENT, 37). % $\%
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-define(FULLSTOP, 46). % $\.
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-define(IS_HEX(C), ((C >= $0 andalso C =< $9) orelse
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(C >= $a andalso C =< $f) orelse
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(C >= $A andalso C =< $F))).
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-define(QS_SAFE(C), ((C >= $a andalso C =< $z) orelse
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(C >= $A andalso C =< $Z) orelse
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(C >= $0 andalso C =< $9) orelse
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(C =:= ?FULLSTOP orelse C =:= $- orelse C =:= $~ orelse
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C =:= $_))).
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hexdigit(C) when C < 10 -> $0 + C;
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hexdigit(C) when C < 16 -> $A + (C - 10).
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unhexdigit(C) when C >= $0, C =< $9 -> C - $0;
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unhexdigit(C) when C >= $a, C =< $f -> C - $a + 10;
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unhexdigit(C) when C >= $A, C =< $F -> C - $A + 10.
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%% @spec partition(String, Sep) -> {String, [], []} | {Prefix, Sep, Postfix}
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%% @doc Inspired by Python 2.5's str.partition:
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%% partition("foo/bar", "/") = {"foo", "/", "bar"},
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%% partition("foo", "/") = {"foo", "", ""}.
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partition(String, Sep) ->
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case partition(String, Sep, []) of
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undefined ->
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{String, "", ""};
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Result ->
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Result
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end.
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partition("", _Sep, _Acc) ->
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undefined;
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partition(S, Sep, Acc) ->
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case partition2(S, Sep) of
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undefined ->
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[C | Rest] = S,
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partition(Rest, Sep, [C | Acc]);
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Rest ->
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{lists:reverse(Acc), Sep, Rest}
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end.
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partition2(Rest, "") ->
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Rest;
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partition2([C | R1], [C | R2]) ->
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partition2(R1, R2);
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partition2(_S, _Sep) ->
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undefined.
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%% @spec safe_relative_path(string()) -> string() | undefined
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%% @doc Return the reduced version of a relative path or undefined if it
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%% is not safe. safe relative paths can be joined with an absolute path
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%% and will result in a subdirectory of the absolute path.
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safe_relative_path("/" ++ _) ->
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undefined;
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safe_relative_path(P) ->
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safe_relative_path(P, []).
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safe_relative_path("", Acc) ->
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case Acc of
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[] ->
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"";
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_ ->
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string:join(lists:reverse(Acc), "/")
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end;
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safe_relative_path(P, Acc) ->
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case partition(P, "/") of
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{"", "/", _} ->
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%% /foo or foo//bar
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undefined;
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{"..", _, _} when Acc =:= [] ->
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undefined;
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{"..", _, Rest} ->
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safe_relative_path(Rest, tl(Acc));
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{Part, "/", ""} ->
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safe_relative_path("", ["", Part | Acc]);
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{Part, _, Rest} ->
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safe_relative_path(Rest, [Part | Acc])
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end.
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%% @spec shell_quote(string()) -> string()
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%% @doc Quote a string according to UNIX shell quoting rules, returns a string
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%% surrounded by double quotes.
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shell_quote(L) ->
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shell_quote(L, [$\"]).
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%% @spec cmd_port([string()], Options) -> port()
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%% @doc open_port({spawn, mochiweb_util:cmd_string(Argv)}, Options).
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cmd_port(Argv, Options) ->
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open_port({spawn, cmd_string(Argv)}, Options).
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%% @spec cmd([string()]) -> string()
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%% @doc os:cmd(cmd_string(Argv)).
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cmd(Argv) ->
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os:cmd(cmd_string(Argv)).
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%% @spec cmd_string([string()]) -> string()
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%% @doc Create a shell quoted command string from a list of arguments.
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cmd_string(Argv) ->
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join([shell_quote(X) || X <- Argv], " ").
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%% @spec join([string()], Separator) -> string()
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%% @doc Join a list of strings together with the given separator
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%% string or char.
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join([], _Separator) ->
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[];
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join([S], _Separator) ->
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lists:flatten(S);
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join(Strings, Separator) ->
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lists:flatten(revjoin(lists:reverse(Strings), Separator, [])).
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revjoin([], _Separator, Acc) ->
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Acc;
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revjoin([S | Rest], Separator, []) ->
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revjoin(Rest, Separator, [S]);
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revjoin([S | Rest], Separator, Acc) ->
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revjoin(Rest, Separator, [S, Separator | Acc]).
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%% @spec quote_plus(atom() | integer() | float() | string() | binary()) -> string()
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%% @doc URL safe encoding of the given term.
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quote_plus(Atom) when is_atom(Atom) ->
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quote_plus(atom_to_list(Atom));
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quote_plus(Int) when is_integer(Int) ->
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quote_plus(integer_to_list(Int));
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quote_plus(Binary) when is_binary(Binary) ->
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quote_plus(binary_to_list(Binary));
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quote_plus(Float) when is_float(Float) ->
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quote_plus(mochinum:digits(Float));
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quote_plus(String) ->
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quote_plus(String, []).
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quote_plus([], Acc) ->
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lists:reverse(Acc);
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quote_plus([C | Rest], Acc) when ?QS_SAFE(C) ->
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quote_plus(Rest, [C | Acc]);
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quote_plus([$\s | Rest], Acc) ->
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quote_plus(Rest, [$+ | Acc]);
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quote_plus([C | Rest], Acc) ->
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<<Hi:4, Lo:4>> = <<C>>,
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quote_plus(Rest, [hexdigit(Lo), hexdigit(Hi), ?PERCENT | Acc]).
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%% @spec urlencode([{Key, Value}]) -> string()
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%% @doc URL encode the property list.
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urlencode(Props) ->
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RevPairs = lists:foldl(fun ({K, V}, Acc) ->
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[[quote_plus(K), $=, quote_plus(V)] | Acc]
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end, [], Props),
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lists:flatten(revjoin(RevPairs, $&, [])).
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%% @spec parse_qs(string() | binary()) -> [{Key, Value}]
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%% @doc Parse a query string or application/x-www-form-urlencoded.
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parse_qs(Binary) when is_binary(Binary) ->
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parse_qs(binary_to_list(Binary));
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parse_qs(String) ->
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parse_qs(String, []).
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parse_qs([], Acc) ->
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lists:reverse(Acc);
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parse_qs(String, Acc) ->
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{Key, Rest} = parse_qs_key(String),
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{Value, Rest1} = parse_qs_value(Rest),
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parse_qs(Rest1, [{Key, Value} | Acc]).
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parse_qs_key(String) ->
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parse_qs_key(String, []).
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parse_qs_key([], Acc) ->
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{qs_revdecode(Acc), ""};
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parse_qs_key([$= | Rest], Acc) ->
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{qs_revdecode(Acc), Rest};
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parse_qs_key(Rest=[$; | _], Acc) ->
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{qs_revdecode(Acc), Rest};
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parse_qs_key(Rest=[$& | _], Acc) ->
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{qs_revdecode(Acc), Rest};
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parse_qs_key([C | Rest], Acc) ->
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parse_qs_key(Rest, [C | Acc]).
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parse_qs_value(String) ->
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parse_qs_value(String, []).
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parse_qs_value([], Acc) ->
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{qs_revdecode(Acc), ""};
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parse_qs_value([$; | Rest], Acc) ->
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{qs_revdecode(Acc), Rest};
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parse_qs_value([$& | Rest], Acc) ->
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{qs_revdecode(Acc), Rest};
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parse_qs_value([C | Rest], Acc) ->
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parse_qs_value(Rest, [C | Acc]).
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%% @spec unquote(string() | binary()) -> string()
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%% @doc Unquote a URL encoded string.
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unquote(Binary) when is_binary(Binary) ->
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unquote(binary_to_list(Binary));
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unquote(String) ->
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qs_revdecode(lists:reverse(String)).
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qs_revdecode(S) ->
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qs_revdecode(S, []).
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qs_revdecode([], Acc) ->
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Acc;
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qs_revdecode([$+ | Rest], Acc) ->
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qs_revdecode(Rest, [$\s | Acc]);
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qs_revdecode([Lo, Hi, ?PERCENT | Rest], Acc) when ?IS_HEX(Lo), ?IS_HEX(Hi) ->
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qs_revdecode(Rest, [(unhexdigit(Lo) bor (unhexdigit(Hi) bsl 4)) | Acc]);
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qs_revdecode([C | Rest], Acc) ->
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qs_revdecode(Rest, [C | Acc]).
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%% @spec urlsplit(Url) -> {Scheme, Netloc, Path, Query, Fragment}
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%% @doc Return a 5-tuple, does not expand % escapes. Only supports HTTP style
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%% URLs.
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urlsplit(Url) ->
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{Scheme, Url1} = urlsplit_scheme(Url),
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{Netloc, Url2} = urlsplit_netloc(Url1),
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{Path, Query, Fragment} = urlsplit_path(Url2),
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{Scheme, Netloc, Path, Query, Fragment}.
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urlsplit_scheme(Url) ->
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urlsplit_scheme(Url, []).
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urlsplit_scheme([], Acc) ->
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{"", lists:reverse(Acc)};
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urlsplit_scheme(":" ++ Rest, Acc) ->
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{string:to_lower(lists:reverse(Acc)), Rest};
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urlsplit_scheme([C | Rest], Acc) ->
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urlsplit_scheme(Rest, [C | Acc]).
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urlsplit_netloc("//" ++ Rest) ->
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urlsplit_netloc(Rest, []);
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urlsplit_netloc(Path) ->
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{"", Path}.
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urlsplit_netloc(Rest=[C | _], Acc) when C =:= $/; C =:= $?; C =:= $# ->
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{lists:reverse(Acc), Rest};
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urlsplit_netloc([C | Rest], Acc) ->
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urlsplit_netloc(Rest, [C | Acc]).
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%% @spec path_split(string()) -> {Part, Rest}
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%% @doc Split a path starting from the left, as in URL traversal.
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%% path_split("foo/bar") = {"foo", "bar"},
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%% path_split("/foo/bar") = {"", "foo/bar"}.
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path_split(S) ->
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path_split(S, []).
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path_split("", Acc) ->
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{lists:reverse(Acc), ""};
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path_split("/" ++ Rest, Acc) ->
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{lists:reverse(Acc), Rest};
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path_split([C | Rest], Acc) ->
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path_split(Rest, [C | Acc]).
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%% @spec urlunsplit({Scheme, Netloc, Path, Query, Fragment}) -> string()
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%% @doc Assemble a URL from the 5-tuple. Path must be absolute.
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urlunsplit({Scheme, Netloc, Path, Query, Fragment}) ->
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lists:flatten([case Scheme of "" -> ""; _ -> [Scheme, "://"] end,
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Netloc,
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urlunsplit_path({Path, Query, Fragment})]).
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%% @spec urlunsplit_path({Path, Query, Fragment}) -> string()
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%% @doc Assemble a URL path from the 3-tuple.
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urlunsplit_path({Path, Query, Fragment}) ->
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lists:flatten([Path,
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case Query of "" -> ""; _ -> [$? | Query] end,
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case Fragment of "" -> ""; _ -> [$# | Fragment] end]).
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%% @spec urlsplit_path(Url) -> {Path, Query, Fragment}
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%% @doc Return a 3-tuple, does not expand % escapes. Only supports HTTP style
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%% paths.
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urlsplit_path(Path) ->
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urlsplit_path(Path, []).
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urlsplit_path("", Acc) ->
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{lists:reverse(Acc), "", ""};
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urlsplit_path("?" ++ Rest, Acc) ->
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{Query, Fragment} = urlsplit_query(Rest),
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{lists:reverse(Acc), Query, Fragment};
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urlsplit_path("#" ++ Rest, Acc) ->
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{lists:reverse(Acc), "", Rest};
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urlsplit_path([C | Rest], Acc) ->
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urlsplit_path(Rest, [C | Acc]).
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urlsplit_query(Query) ->
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urlsplit_query(Query, []).
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urlsplit_query("", Acc) ->
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{lists:reverse(Acc), ""};
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urlsplit_query("#" ++ Rest, Acc) ->
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{lists:reverse(Acc), Rest};
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urlsplit_query([C | Rest], Acc) ->
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urlsplit_query(Rest, [C | Acc]).
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%% @spec guess_mime(string()) -> string()
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%% @doc Guess the mime type of a file by the extension of its filename.
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guess_mime(File) ->
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case filename:extension(File) of
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".html" ->
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"text/html";
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".xhtml" ->
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"application/xhtml+xml";
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".xml" ->
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"application/xml";
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".css" ->
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"text/css";
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".js" ->
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"application/x-javascript";
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".jpg" ->
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"image/jpeg";
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".gif" ->
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"image/gif";
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".png" ->
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"image/png";
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".swf" ->
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"application/x-shockwave-flash";
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".zip" ->
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"application/zip";
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".bz2" ->
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"application/x-bzip2";
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".gz" ->
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"application/x-gzip";
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".tar" ->
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"application/x-tar";
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".tgz" ->
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"application/x-gzip";
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".txt" ->
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"text/plain";
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".doc" ->
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"application/msword";
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".pdf" ->
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"application/pdf";
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".xls" ->
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"application/vnd.ms-excel";
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".rtf" ->
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"application/rtf";
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".mov" ->
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"video/quicktime";
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".mp3" ->
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"audio/mpeg";
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".z" ->
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"application/x-compress";
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".wav" ->
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"audio/x-wav";
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".ico" ->
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"image/x-icon";
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".bmp" ->
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"image/bmp";
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".m4a" ->
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"audio/mpeg";
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".m3u" ->
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"audio/x-mpegurl";
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".exe" ->
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"application/octet-stream";
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".csv" ->
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"text/csv";
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_ ->
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"text/plain"
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end.
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%% @spec parse_header(string()) -> {Type, [{K, V}]}
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%% @doc Parse a Content-Type like header, return the main Content-Type
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%% and a property list of options.
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parse_header(String) ->
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%% TODO: This is exactly as broken as Python's cgi module.
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%% Should parse properly like mochiweb_cookies.
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[Type | Parts] = [string:strip(S) || S <- string:tokens(String, ";")],
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F = fun (S, Acc) ->
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case lists:splitwith(fun (C) -> C =/= $= end, S) of
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{"", _} ->
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%% Skip anything with no name
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Acc;
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{_, ""} ->
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%% Skip anything with no value
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Acc;
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{Name, [$\= | Value]} ->
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[{string:to_lower(string:strip(Name)),
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unquote_header(string:strip(Value))} | Acc]
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end
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end,
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{string:to_lower(Type),
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lists:foldr(F, [], Parts)}.
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unquote_header("\"" ++ Rest) ->
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unquote_header(Rest, []);
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unquote_header(S) ->
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S.
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unquote_header("", Acc) ->
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lists:reverse(Acc);
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unquote_header("\"", Acc) ->
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lists:reverse(Acc);
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unquote_header([$\\, C | Rest], Acc) ->
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unquote_header(Rest, [C | Acc]);
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unquote_header([C | Rest], Acc) ->
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unquote_header(Rest, [C | Acc]).
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%% @spec record_to_proplist(Record, Fields) -> proplist()
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%% @doc calls record_to_proplist/3 with a default TypeKey of '__record'
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record_to_proplist(Record, Fields) ->
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record_to_proplist(Record, Fields, '__record').
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%% @spec record_to_proplist(Record, Fields, TypeKey) -> proplist()
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%% @doc Return a proplist of the given Record with each field in the
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%% Fields list set as a key with the corresponding value in the Record.
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%% TypeKey is the key that is used to store the record type
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%% Fields should be obtained by calling record_info(fields, record_type)
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%% where record_type is the record type of Record
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record_to_proplist(Record, Fields, TypeKey)
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when is_tuple(Record),
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is_list(Fields),
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size(Record) - 1 =:= length(Fields) ->
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lists:zip([TypeKey | Fields], tuple_to_list(Record)).
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shell_quote([], Acc) ->
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lists:reverse([$\" | Acc]);
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shell_quote([C | Rest], Acc) when C =:= $\" orelse C =:= $\` orelse
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C =:= $\\ orelse C =:= $\$ ->
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shell_quote(Rest, [C, $\\ | Acc]);
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shell_quote([C | Rest], Acc) ->
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shell_quote(Rest, [C | Acc]).
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test() ->
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test_join(),
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test_quote_plus(),
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test_unquote(),
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test_urlencode(),
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test_parse_qs(),
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test_urlsplit_path(),
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test_urlunsplit_path(),
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test_urlsplit(),
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test_urlunsplit(),
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test_path_split(),
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test_guess_mime(),
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test_parse_header(),
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test_shell_quote(),
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test_cmd(),
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test_cmd_string(),
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test_partition(),
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test_safe_relative_path(),
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ok.
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test_shell_quote() ->
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"\"foo \\$bar\\\"\\`' baz\"" = shell_quote("foo $bar\"`' baz"),
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ok.
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test_cmd() ->
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"$bling$ `word`!\n" = cmd(["echo", "$bling$ `word`!"]),
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ok.
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test_cmd_string() ->
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"\"echo\" \"\\$bling\\$ \\`word\\`!\"" = cmd_string(["echo", "$bling$ `word`!"]),
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ok.
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test_parse_header() ->
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{"multipart/form-data", [{"boundary", "AaB03x"}]} =
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parse_header("multipart/form-data; boundary=AaB03x"),
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ok.
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test_guess_mime() ->
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"text/plain" = guess_mime(""),
|
|
"text/plain" = guess_mime(".text"),
|
|
"application/zip" = guess_mime(".zip"),
|
|
"application/zip" = guess_mime("x.zip"),
|
|
"text/html" = guess_mime("x.html"),
|
|
"application/xhtml+xml" = guess_mime("x.xhtml"),
|
|
ok.
|
|
|
|
test_path_split() ->
|
|
{"", "foo/bar"} = path_split("/foo/bar"),
|
|
{"foo", "bar"} = path_split("foo/bar"),
|
|
{"bar", ""} = path_split("bar"),
|
|
ok.
|
|
|
|
test_urlsplit() ->
|
|
{"", "", "/foo", "", "bar?baz"} = urlsplit("/foo#bar?baz"),
|
|
{"http", "host:port", "/foo", "", "bar?baz"} =
|
|
urlsplit("http://host:port/foo#bar?baz"),
|
|
ok.
|
|
|
|
test_urlsplit_path() ->
|
|
{"/foo/bar", "", ""} = urlsplit_path("/foo/bar"),
|
|
{"/foo", "baz", ""} = urlsplit_path("/foo?baz"),
|
|
{"/foo", "", "bar?baz"} = urlsplit_path("/foo#bar?baz"),
|
|
{"/foo", "", "bar?baz#wibble"} = urlsplit_path("/foo#bar?baz#wibble"),
|
|
{"/foo", "bar", "baz"} = urlsplit_path("/foo?bar#baz"),
|
|
{"/foo", "bar?baz", "baz"} = urlsplit_path("/foo?bar?baz#baz"),
|
|
ok.
|
|
|
|
test_urlunsplit() ->
|
|
"/foo#bar?baz" = urlunsplit({"", "", "/foo", "", "bar?baz"}),
|
|
"http://host:port/foo#bar?baz" =
|
|
urlunsplit({"http", "host:port", "/foo", "", "bar?baz"}),
|
|
ok.
|
|
|
|
test_urlunsplit_path() ->
|
|
"/foo/bar" = urlunsplit_path({"/foo/bar", "", ""}),
|
|
"/foo?baz" = urlunsplit_path({"/foo", "baz", ""}),
|
|
"/foo#bar?baz" = urlunsplit_path({"/foo", "", "bar?baz"}),
|
|
"/foo#bar?baz#wibble" = urlunsplit_path({"/foo", "", "bar?baz#wibble"}),
|
|
"/foo?bar#baz" = urlunsplit_path({"/foo", "bar", "baz"}),
|
|
"/foo?bar?baz#baz" = urlunsplit_path({"/foo", "bar?baz", "baz"}),
|
|
ok.
|
|
|
|
test_join() ->
|
|
"foo,bar,baz" = join(["foo", "bar", "baz"], $,),
|
|
"foo,bar,baz" = join(["foo", "bar", "baz"], ","),
|
|
"foo bar" = join([["foo", " bar"]], ","),
|
|
"foo bar,baz" = join([["foo", " bar"], "baz"], ","),
|
|
"foo" = join(["foo"], ","),
|
|
"foobarbaz" = join(["foo", "bar", "baz"], ""),
|
|
ok.
|
|
|
|
test_quote_plus() ->
|
|
"foo" = quote_plus(foo),
|
|
"1" = quote_plus(1),
|
|
"1.1" = quote_plus(1.1),
|
|
"foo" = quote_plus("foo"),
|
|
"foo+bar" = quote_plus("foo bar"),
|
|
"foo%0A" = quote_plus("foo\n"),
|
|
"foo%0A" = quote_plus("foo\n"),
|
|
"foo%3B%26%3D" = quote_plus("foo;&="),
|
|
ok.
|
|
|
|
test_unquote() ->
|
|
"foo bar" = unquote("foo+bar"),
|
|
"foo bar" = unquote("foo%20bar"),
|
|
"foo\r\n" = unquote("foo%0D%0A"),
|
|
ok.
|
|
|
|
test_urlencode() ->
|
|
"foo=bar&baz=wibble+%0D%0A&z=1" = urlencode([{foo, "bar"},
|
|
{"baz", "wibble \r\n"},
|
|
{z, 1}]),
|
|
ok.
|
|
|
|
test_parse_qs() ->
|
|
[{"foo", "bar"}, {"baz", "wibble \r\n"}, {"z", "1"}] =
|
|
parse_qs("foo=bar&baz=wibble+%0D%0A&z=1"),
|
|
ok.
|
|
|
|
test_partition() ->
|
|
{"foo", "", ""} = partition("foo", "/"),
|
|
{"foo", "/", "bar"} = partition("foo/bar", "/"),
|
|
{"foo", "/", ""} = partition("foo/", "/"),
|
|
{"", "/", "bar"} = partition("/bar", "/"),
|
|
{"f", "oo/ba", "r"} = partition("foo/bar", "oo/ba"),
|
|
ok.
|
|
|
|
test_safe_relative_path() ->
|
|
"foo" = safe_relative_path("foo"),
|
|
"foo/" = safe_relative_path("foo/"),
|
|
"foo" = safe_relative_path("foo/bar/.."),
|
|
"bar" = safe_relative_path("foo/../bar"),
|
|
"bar/" = safe_relative_path("foo/../bar/"),
|
|
"" = safe_relative_path("foo/.."),
|
|
"" = safe_relative_path("foo/../"),
|
|
undefined = safe_relative_path("/foo"),
|
|
undefined = safe_relative_path("../foo"),
|
|
undefined = safe_relative_path("foo/../.."),
|
|
undefined = safe_relative_path("foo//"),
|
|
ok.
|