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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]).
-define(is_uppercase_alpha(C), C >= $A, C =< $Z).
-define(is_lowercase_alpha(C), C >= $a, C =< $z).
-define(is_alpha(C), ?is_uppercase_alpha(C); ?is_lowercase_alpha(C)).
-define(is_digit(C), C >= $0, C =< $9).
-define(is_alphanumeric(C), ?is_alpha(C); ?is_digit(C)).
-define(is_unreserved(C), ?is_alphanumeric(C); C =:= $-; C =:= $_; C =:= $.; C =:= $~).
-define(is_hex(C), ?is_digit(C); C >= $A, C =< $F).
normalize(URI) ->
case http_uri:parse(URI) of
{Scheme, UserInfo, Host, Port, Path, _Query} ->
normalize(Scheme, UserInfo, string:to_lower(Host), Port, [Path]);
Else ->
Else
end.
normalize(http, UserInfo, Host, 80, Acc) ->
normalize(http, UserInfo, [Host|Acc]);
normalize(https, UserInfo, Host, 443, Acc) ->
normalize(https, UserInfo, [Host|Acc]);
normalize(Scheme, UserInfo, Host, Port, Acc) ->
normalize(Scheme, UserInfo, [Host, ":", Port|Acc]).
normalize(Scheme, [], Acc) ->
concat([Scheme, "://"|Acc]);
normalize(Scheme, UserInfo, Acc) ->
concat([Scheme, "://", UserInfo, "@"|Acc]).
params_to_header_string(Params) ->
intercalate(", ", [concat([encode(K), "=\"", encode(V), "\""]) || {K, V} <- Params]).
params_from_header_string(String) ->
[param_from_header_string(Param) || Param <- re:split(String, ",\\s*", [{return, list}]), Param =/= ""].
param_from_header_string(Param) ->
[Key, QuotedValue] = string:tokens(Param, "="),
Value = string:substr(QuotedValue, 2, length(QuotedValue) - 2),
{decode(Key), decode(Value)}.
params_from_string(Params) ->
[param_from_string(Param) || Param <- string:tokens(Params, "&")].
param_from_string(Param) ->
list_to_tuple([decode(Value) || Value <- string:tokens(Param, "=")]).
params_to_string(Params) ->
intercalate("&", [calate("=", [K, V]) || {K, V} <- Params]).
calate(Sep, Xs) ->
intercalate(Sep, [encode(X) || X <- Xs]).
intercalate(Sep, Xs) ->
concat(intersperse(Sep, Xs)).
intersperse(_, []) -> [];
intersperse(_, [X]) -> [X];
intersperse(Sep, [X|Xs]) ->
[X, Sep|intersperse(Sep, Xs)].
decode(Chars) ->
decode(Chars, []).
decode([], Decoded) ->
lists:reverse(Decoded);
decode([$%,A,B|Etc], Decoded) when ?is_hex(A), ?is_hex(B) ->
decode(Etc, [erlang:list_to_integer([A,B], 16)|Decoded]);
decode([C|Etc], Decoded) when ?is_unreserved(C) ->
decode(Etc, [C|Decoded]).
encode(Chars) ->
encode(Chars, []).
encode([], Encoded) ->
lists:flatten(lists:reverse(Encoded));
encode([C|Etc], Encoded) when ?is_unreserved(C) ->
encode(Etc, [C|Encoded]);
encode([C|Etc], Encoded) ->
Value = io_lib:format("%~2.1.0s", [erlang:integer_to_list(C, 16)]),
encode(Etc, [Value|Encoded]).
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