%% ``Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% The Initial Developer of the Original Code is Mobile Arts AB
%% Portions created by Mobile Arts are Copyright 2002, Mobile Arts AB
%% All Rights Reserved.''
%%
%%
%% Author : Johan Blom <[email protected]>
%% Description :
%% Implements various scheme dependent subsets (e.g. HTTP, FTP etc) based on
%% RFC 2396, Uniform Resource Identifiers (URI): Generic Syntax
%% Created : 27 Jul 2001 by Johan Blom <[email protected]>
-module(uri).
-author('[email protected]').
-export([parse/1,resolve/2]).
%%% Parse URI and return {Scheme,Path}
%%% Note that Scheme specific parsing/validation is not handled here!
resolve(Root,Rel) ->
ok.
%%% See "http://www.isi.edu/in-notes/iana/assignments/url-schemes" for a list of
%%% defined URL schemes and references to its sources.
parse(URI) ->
case parse_scheme(URI) of
{http,Cont} -> parse_http(Cont,http);
{https,Cont} -> parse_http(Cont,https);
{ftp,Cont} -> parse_ftp(Cont,ftp);
{sip,Cont} -> parse_sip(Cont,sip);
{sms,Cont} -> parse_sms(Cont,sip);
{error,Error} -> {error,Error};
{Scheme,Cont} -> {Scheme,Cont}
end.
%%% Parse the scheme.
parse_scheme(URI) ->
parse_scheme(URI,[]).
parse_scheme([H|URI],Acc) when $a=<H,H=<$z; $A=<H,H=<$Z ->
parse_scheme2(URI,[H|Acc]);
parse_scheme(_,_) ->
{error,no_scheme}.
parse_scheme2([H|URI],Acc)
when $a=<H,H=<$z; $A=<H,H=<$Z; $0=<H,H=<$9; H==$-;H==$+;H==$. ->
parse_scheme2(URI,[H|Acc]);
parse_scheme2([$:|URI],Acc) ->
{list_to_atom(lists:reverse(Acc)),URI};
parse_scheme2(_,_) ->
{error,no_scheme}.
%%% ............................................................................
-define(HTTP_DEFAULT_PORT, 80).
-define(HTTPS_DEFAULT_PORT, 443).
%%% HTTP (Source RFC 2396, RFC 2616)
%%% http_URL = "*" | absoluteURI | abs_path [ "?" query ] | authority
%%% http_URL = "http:" "//" host [ ":" port ] [ abs_path [ "?" query ]]
%%% Returns a tuple {http,Host,Port,PathQuery} where
%%% Host = string() Host value
%%% Port = string() Port value
%%% PathQuery= string() Combined absolute path and query value
parse_http("//"++C0,Scheme) ->
case scan_hostport(C0,Scheme) of
{C1,Host,Port} ->
case scan_pathquery(C1) of
{error,Error} ->
{error,Error};
PathQuery ->
{Scheme,Host,Port,PathQuery}
end;
{error,Error} ->
{error,Error}
end;
parse_http(_,_) ->
{error,invalid_url}.
scan_pathquery(C0) ->
case scan_abspath(C0) of
{error,Error} ->
{error,Error};
{[],[]} -> % Add implicit path
"/";
{"?"++C1,Path} ->
case scan_query(C1,[]) of
{error,Error} ->
{error,Error};
Query ->
Path++"?"++Query
end;
{[],Path} ->
Path
end.
%%% ............................................................................
%%% FIXME!!! This is just a quick hack that doesn't work!
-define(FTP_DEFAULT_PORT, 80).
%%% FTP (Source RFC 2396, RFC 1738, RFC 959)
%%% Note: This BNF has been modified to better fit with RFC 2396
%%% ftp_URL = "ftp:" "//" [ ftp_userinfo ] host [ ":" port ] ftp_abs_path
%%% ftp_userinfo = ftp_user [ ":" ftp_password ]
%%% ftp_abs_path = "/" ftp_path_segments [ ";type=" ftp_type ]
%%% ftp_path_segments = ftp_segment *( "/" ftp_segment)
%%% ftp_segment = *[ ftp_uchar | "?" | ":" | "@" | "&" | "=" ]
%%% ftp_type = "A" | "I" | "D" | "a" | "i" | "d"
%%% ftp_user = *[ ftp_uchar | ";" | "?" | "&" | "=" ]
%%% ftp_password = *[ ftp_uchar | ";" | "?" | "&" | "=" ]
%%% ftp_uchar = ftp_unreserved | escaped
%%% ftp_unreserved = alphanum | mark | "$" | "+" | ","
parse_ftp("//"++C0,Scheme) ->
case ftp_userinfo(C0) of
{C1,Creds} ->
case scan_hostport(C1,Scheme) of
{C2,Host,Port} ->
case scan_abspath(C2) of
{error,Error} ->
{error,Error};
{[],[]} -> % Add implicit path
{Scheme,Creds,Host,Port,"/"};
{[],Path} ->
{Scheme,Creds,Host,Port,Path}
end;
{error,Error} ->
{error,Error}
end;
{error,Error} ->
{error,Error}
end.
ftp_userinfo(C0) ->
User="",
Password="",
{C0,{User,Password}}.
%%% ............................................................................
%%% SIP (Source RFC 2396, RFC 2543)
%%% sip_URL = "sip:" [ sip_userinfo "@" ] host [ ":" port ]
%%% sip_url-parameters [ sip_headers ]
%%% sip_userinfo = sip_user [ ":" sip_password ]
%%% sip_user = *( unreserved | escaped | "&" | "=" | "+" | "$" | "," )
%%% sip_password = *( unreserved | escaped | "&" | "=" | "+" | "$" | "," )
%%% sip_url-parameters = *( ";" sip_url-parameter )
%%% sip_url-parameter = sip_transport-param | sip_user-param |
%%% sip_method-param | sip_ttl-param |
%%% sip_maddr-param | sip_other-param
%%% sip_transport-param = "transport=" ( "udp" | "tcp" )
%%% sip_ttl-param = "ttl=" sip_ttl
%%% sip_ttl = 1*3DIGIT ; 0 to 255
%%% sip_maddr-param = "maddr=" host
%%% sip_user-param = "user=" ( "phone" | "ip" )
%%% sip_method-param = "method=" sip_Method
%%% sip_tag-param = "tag=" sip_UUID
%%% sip_UUID = 1*( hex | "-" )
%%% sip_other-param = ( token | ( token "=" ( token | quoted-string )))
%%% sip_Method = "INVITE" | "ACK" | "OPTIONS" | "BYE" |
%%% "CANCEL" | "REGISTER"
%%% sip_token = 1*< any CHAR except CTL's or separators>
%%% sip_quoted-string = ( <"> *(qdtext | quoted-pair ) <"> )
%%% sip_qdtext = <any TEXT-UTF8 except <">>
%%% sip_quoted-pair = " \ " CHAR
parse_sip(Cont,Scheme) ->
{Scheme,Cont}.
%%% ............................................................................
%%% SMS (Source draft-wilde-sms-uri-01, January 24 2002 and
%%% draft-allocchio-gstn-01, November 2001)
%%% The syntax definition for "gstn-phone" is taken from
%%% [draft-allocchio-gstn-01], allowing global as well as local telephone
%%% numbers.
%%% Note: This BNF has been modified to better fit with RFC 2396
%%% sms_URI = sms ":" 1*( sms-recipient ) [ sms-body ]
%%% sms-recipient = gstn-phone sms-qualifier
%%% [ "," sms-recipient ]
%%% sms-qualifier = *( smsc-qualifier / pid-qualifier )
%%% smsc-qualifier = ";smsc=" SMSC-sub-addr
%%% pid-qualifier = ";pid=" PID-sub-addr
%%% sms-body = ";body=" *urlc
%%% gstn-phone = ( global-phone / local-phone )
%%% global-phone = "+" 1*( DIGIT / written-sep )
%%% local-phone = [ exit-code ] dial-number / exit-code [ dial-number ]
%%% exit-code = phone-string
%%% dial-number = phone-string
%%% subaddr-string = phone-string
%%% post-dial = phone-string
%%% phone-string = 1*( DTMF / pause / tonewait / written-sep )
%%% DTMF = ( DIGIT / "#" / "*" / "A" / "B" / "C" / "D" )
%%% written-sep = ( "-" / "." )
%%% pause = "p"
%%% tonewait = "w"
parse_sms(Cont,Scheme) ->
{Scheme,Cont}.
%%% ============================================================================
%%% Generic URI parsing. BNF rules from RFC 2396
%%% hostport = host [ ":" port ]
scan_hostport(C0,Scheme) ->
case scan_host(C0) of
{error,Error} ->
{error,Error};
{":"++C1,Host} ->
{C2,Port}=scan_port(C1,[]),
{C2,Host,list_to_integer(Port)};
{C1,Host} when Scheme==http ->
{C1,Host,?HTTP_DEFAULT_PORT};
{C1,Host} when Scheme==https ->
{C1,Host,?HTTPS_DEFAULT_PORT};
{C1,Host} when Scheme==ftp ->
{C1,Host,?FTP_DEFAULT_PORT}
end.
%%% host = hostname | IPv4address
%%% hostname = *( domainlabel "." ) toplabel [ "." ]
%%% domainlabel = alphanum | alphanum *( alphanum | "-" ) alphanum
%%% toplabel = alpha | alpha *( alphanum | "-" ) alphanum
%%% IPv4address = 1*digit "." 1*digit "." 1*digit "." 1*digit
-define(ALPHA, 1).
-define(DIGIT, 2).
scan_host(C0) ->
case scan_host2(C0,[],0,[],[]) of
{C1,IPv4address,[?DIGIT,?DIGIT,?DIGIT,?DIGIT]} ->
{C1,lists:reverse(lists:append(IPv4address))};
{C1,Hostname,[?ALPHA|HostF]} ->
{C1,lists:reverse(lists:append(Hostname))};
_ ->
{error,no_host}
end.
scan_host2([H|C0],Acc,CurF,Host,HostF) when $0=<H,H=<$9 ->
scan_host2(C0,[H|Acc],CurF bor ?DIGIT,Host,HostF);
scan_host2([H|C0],Acc,CurF,Host,HostF) when $a=<H,H=<$z; $A=<H,H=<$Z ->
scan_host2(C0,[H|Acc],CurF bor ?ALPHA,Host,HostF);
scan_host2([$-|C0],Acc,CurF,Host,HostF) when CurF=/=0 ->
scan_host2(C0,[$-|Acc],CurF,Host,HostF);
scan_host2([$.|C0],Acc,CurF,Host,HostF) when CurF=/=0 ->
scan_host2(C0,[],0,[".",Acc|Host],[CurF|HostF]);
scan_host2(C0,Acc,CurF,Host,HostF) ->
{C0,[Acc|Host],[CurF|HostF]}.
%%% port = *digit
scan_port([H|C0],Acc) when $0=<H,H=<$9 ->
scan_port(C0,[H|Acc]);
scan_port(C0,Acc) ->
{C0,lists:reverse(Acc)}.
%%% abs_path = "/" path_segments
scan_abspath([]) ->
{[],[]};
scan_abspath("/"++C0) ->
scan_pathsegments(C0,["/"]);
scan_abspath(_) ->
{error,no_abspath}.
%%% path_segments = segment *( "/" segment )
scan_pathsegments(C0,Acc) ->
case scan_segment(C0,[]) of
{"/"++C1,Segment} ->
scan_pathsegments(C1,["/",Segment|Acc]);
{C1,Segment} ->
{C1,lists:reverse(lists:append([Segment|Acc]))}
end.
%%% segment = *pchar *( ";" param )
%%% param = *pchar
scan_segment(";"++C0,Acc) ->
{C1,ParamAcc}=scan_pchars(C0,";"++Acc),
scan_segment(C1,ParamAcc);
scan_segment(C0,Acc) ->
case scan_pchars(C0,Acc) of
{";"++C1,Segment} ->
{C2,ParamAcc}=scan_pchars(C1,";"++Segment),
scan_segment(C2,ParamAcc);
{C1,Segment} ->
{C1,Segment}
end.
%%% query = *uric
%%% uric = reserved | unreserved | escaped
%%% reserved = ";" | "/" | "?" | ":" | "@" | "&" | "=" | "+" |
%%% "$" | ","
%%% unreserved = alphanum | mark
%%% mark = "-" | "_" | "." | "!" | "~" | "*" | "'" |
%%% "(" | ")"
%%% escaped = "%" hex hex
scan_query([],Acc) ->
lists:reverse(Acc);
scan_query([$%,H1,H2|C0],Acc) -> % escaped
scan_query(C0,[hex2dec(H1)*16+hex2dec(H2)|Acc]);
scan_query([H|C0],Acc) when $a=<H,H=<$z;$A=<H,H=<$Z;$0=<H,H=<$9 -> % alphanum
scan_query(C0,[H|Acc]);
scan_query([H|C0],Acc) when H==$;; H==$/; H==$?; H==$:; H==$@;
H==$&; H==$=; H==$+; H==$$; H==$, -> % reserved
scan_query(C0,[H|Acc]);
scan_query([H|C0],Acc) when H==$-; H==$_; H==$.; H==$!; H==$~;
H==$*; H==$'; H==$(; H==$) -> % mark
scan_query(C0,[H|Acc]);
scan_query([H|C0],Acc) ->
{error,no_query}.
%%% pchar = unreserved | escaped |
%%% ":" | "@" | "&" | "=" | "+" | "$" | ","
scan_pchars([],Acc) ->
{[],Acc};
scan_pchars([$%,H1,H2|C0],Acc) -> % escaped
scan_pchars(C0,[hex2dec(H1)*16+hex2dec(H2)|Acc]);
scan_pchars([H|C0],Acc) when $a=<H,H=<$z;$A=<H,H=<$Z;$0=<H,H=<$9 -> % alphanum
scan_pchars(C0,[H|Acc]);
scan_pchars([H|C0],Acc) when H==$-; H==$_; H==$.; H==$!; H==$~;
H==$*; H==$'; H==$(; H==$) -> % mark
scan_pchars(C0,[H|Acc]);
scan_pchars([H|C0],Acc) when H==$:; H==$@; H==$&; H==$=; H==$+; H==$$; H==$, ->
scan_pchars(C0,[H|Acc]);
scan_pchars(C0,Acc) ->
{C0,Acc}.
hex2dec(X) when X>=$0,X=<$9 -> X-$0;
hex2dec(X) when X>=$A,X=<$F -> X-$A+10;
hex2dec(X) when X>=$a,X=<$f -> X-$a+10.
