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-module(oauth_uri).
-export([normalize/1, calate/2, encode/1]).
-export([params_from_string/1, params_to_string/1,
params_from_header_string/1, params_to_header_string/1]).
-import(lists, [concat/1]).
normalize(URI) ->
case http_uri:parse(URI) of
{Scheme, UserInfo, Host, Port, Path, _Query} ->
normalize(Scheme, UserInfo, string:to_lower(Host), Port, [Path]);
Else ->
Else
end.
normalize(http, UserInfo, Host, 80, Acc) ->
normalize(http, UserInfo, [Host|Acc]);
normalize(https, UserInfo, Host, 443, Acc) ->
normalize(https, UserInfo, [Host|Acc]);
normalize(Scheme, UserInfo, Host, Port, Acc) ->
normalize(Scheme, UserInfo, [Host, ":", Port|Acc]).
normalize(Scheme, [], Acc) ->
concat([Scheme, "://"|Acc]);
normalize(Scheme, UserInfo, Acc) ->
concat([Scheme, "://", UserInfo, "@"|Acc]).
params_to_header_string(Params) ->
intercalate(", ", [concat([encode(K), "=\"", encode(V), "\""]) || {K, V} <- Params]).
params_from_header_string(String) ->
[param_from_header_string(Param) || Param <- re:split(String, ",\\s*", [{return, list}]), Param =/= ""].
param_from_header_string(Param) ->
[Key, QuotedValue] = string:tokens(Param, "="),
Value = string:substr(QuotedValue, 2, length(QuotedValue) - 2),
{decode(Key), decode(Value)}.
params_from_string(Params) ->
[param_from_string(Param) || Param <- string:tokens(Params, "&")].
param_from_string(Param) ->
list_to_tuple([decode(Value) || Value <- string:tokens(Param, "=")]).
params_to_string(Params) ->
intercalate("&", [calate("=", [K, V]) || {K, V} <- Params]).
calate(Sep, Xs) ->
intercalate(Sep, [encode(X) || X <- Xs]).
intercalate(Sep, Xs) ->
concat(intersperse(Sep, Xs)).
intersperse(_, []) -> [];
intersperse(_, [X]) -> [X];
intersperse(Sep, [X|Xs]) ->
[X, Sep|intersperse(Sep, Xs)].
-define(is_alphanum(C), C >= $A, C =< $Z; C >= $a, C =< $z; C >= $0, C =< $9).
encode(Term) when is_integer(Term) ->
integer_to_list(Term);
encode(Term) when is_atom(Term) ->
encode(atom_to_list(Term));
encode(Term) when is_list(Term) ->
encode(lists:reverse(Term, []), []).
encode([X | T], Acc) when ?is_alphanum(X); X =:= $-; X =:= $_; X =:= $.; X =:= $~ ->
encode(T, [X | Acc]);
encode([X | T], Acc) ->
NewAcc = [$%, dec2hex(X bsr 4), dec2hex(X band 16#0f) | Acc],
encode(T, NewAcc);
encode([], Acc) ->
Acc.
decode(Str) when is_list(Str) ->
decode(Str, []).
decode([$%, A, B | T], Acc) ->
decode(T, [(hex2dec(A) bsl 4) + hex2dec(B) | Acc]);
decode([X | T], Acc) ->
decode(T, [X | Acc]);
decode([], Acc) ->
lists:reverse(Acc, []).
-compile({inline, [{dec2hex, 1}, {hex2dec, 1}]}).
dec2hex(N) when N >= 10 andalso N =< 15 ->
N + $A - 10;
dec2hex(N) when N >= 0 andalso N =< 9 ->
N + $0.
hex2dec(C) when C >= $A andalso C =< $F ->
C - $A + 10;
hex2dec(C) when C >= $0 andalso C =< $9 ->
C - $0.
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