[gforth] / gforth / proxy.fs  

gforth: gforth/proxy.fs

1 : pazsan 1.1 \ a http proxy
2 :    
3 : anton 1.8 \ Copyright (C) 2000,2002 Free Software Foundation, Inc.
4 : pazsan 1.1
5 :     \ This file is part of Gforth.
6 :    
7 :     \ Gforth is free software; you can redistribute it and/or
8 :     \ modify it under the terms of the GNU General Public License
9 :     \ as published by the Free Software Foundation; either version 2
10 :     \ of the License, or (at your option) any later version.
11 :    
12 :     \ This program is distributed in the hope that it will be useful,
13 :     \ but WITHOUT ANY WARRANTY; without even the implied warranty of
14 :     \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 :     \ GNU General Public License for more details.
16 :    
17 :     \ You should have received a copy of the GNU General Public License
18 :     \ along with this program; if not, write to the Free Software
19 :     \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
20 :    
21 :     require unix/socket.fs
22 :    
23 :     Create crlf #cr c, #lf c,
24 :    
25 :     : writeln ( addr u fd -- )
26 :     dup >r write-file throw crlf 2 r> write-file throw ;
27 :    
28 :     : request ( host u request u proxy-host u port -- fid )
29 :     open-socket >r
30 :     r@ write-file throw s" HTTP/1.1" r@ writeln
31 :     s" Host: " r@ write-file throw r@ writeln
32 :     s" Connection: close" r@ writeln
33 :     s" User-Agent: " r@ write-file throw
34 :     User-Agent @ IF
35 :     User-Agent $@ r@ write-file throw s" via Gforth Proxy 0.1"
36 :     ELSE s" Gforth Proxy 0.1" THEN r@ writeln
37 :     s" " r@ writeln r> ;
38 :    
39 : pazsan 1.5 Variable proxy s" proxy" proxy $! \ replace that with your proxy host
40 :     Variable proxy-port 3128 proxy-port ! \ replace that with your proxy port
41 : pazsan 1.1
42 :     : proxy-open ( host u request u -- fid )
43 :     proxy $@ proxy-port @ request ;
44 :    
45 :     : http-open ( host u request u -- fid )
46 :     2over 80 request ;
47 :    
48 :     wordlist Constant response
49 :     wordlist Constant response-values
50 :    
51 :     Variable response-string
52 :    
53 :     : response: ( -- ) name
54 :     Forth definitions 2dup 1- nextname Variable
55 :     response-values set-current nextname here cell - Create ,
56 :     DOES> @ get-rest ;
57 :     : >response response-values 1 set-order ;
58 :    
59 :     response set-current
60 :    
61 :     : HTTP/1.1 response-string get-rest >response ;
62 :     : HTTP/1.0 response-string get-rest >response ;
63 :    
64 :     \ response variables
65 :    
66 :     Forth definitions
67 :    
68 :     response: Allow:
69 :     response: Age:
70 : pazsan 1.4 response: Accept-Ranges:
71 : pazsan 1.1 response: Cache-Control:
72 :     response: Connection:
73 :     response: Proxy-Connection:
74 :     response: Content-Base:
75 :     response: Content-Encoding:
76 :     response: Content-Language:
77 :     response: Content-Length:
78 :     response: Content-Location:
79 :     response: Content-MD5:
80 :     response: Content-Range:
81 :     response: Content-Type:
82 :     response: Date:
83 :     response: ETag:
84 :     response: Expires:
85 : pazsan 1.4 response: Last-Modified:
86 : pazsan 1.1 response: Location:
87 :     response: Mime-Version:
88 :     response: Proxy-Authenticate:
89 : pazsan 1.4 response: Proxy-Connection:
90 : pazsan 1.1 response: Public:
91 :     response: Retry-After:
92 :     response: Server:
93 :     response: Transfer-Encoding:
94 :     response: Upgrade:
95 :     response: Via:
96 :     response: Warning:
97 :     response: WWW-Authenticate:
98 :     response: X-Cache:
99 :     response: X-Powered-By:
100 :    
101 :     Forth definitions
102 :    
103 :     \ response handling
104 :    
105 :     : get-response ( fid -- ior )
106 :     push-file loadfile ! loadline off blk off
107 :     response 1 set-order ['] refill-loop catch
108 :     only forth also pop-file ;
109 :    
110 :     \ data handling
111 :    
112 :     Variable data-buffer
113 :    
114 :     : clear-data ( -- )
115 :     s" " data-buffer $! ;
116 :     : add-chunk ( u fid -- u' )
117 :     swap data-buffer $@len dup >r + data-buffer $!len
118 :     data-buffer $@ r@ /string rot read-file throw
119 :     dup r> + data-buffer $!len ;
120 :     : read-sized ( u fid -- )
121 :     add-chunk drop ;
122 :     : read-to-end ( fid -- )
123 :     >r BEGIN $1000 r@ add-chunk $1000 <> UNTIL rdrop ;
124 :    
125 :     : read-chunked ( fid -- ) base @ >r hex >r
126 :     BEGIN pad $100 r@ read-line throw WHILE
127 :     pad swap s>number drop dup WHILE r@ add-chunk drop
128 :     pad 1 r@ read-line throw nip 0= UNTIL
129 :     ELSE drop THEN THEN rdrop r> base ! ;
130 :    
131 :     : read-data ( fid -- ) clear-data >r
132 :     Content-Length @ IF
133 :     Content-Length $@ s>number drop r> read-sized EXIT THEN
134 :     Transfer-Encoding @ IF
135 : anton 1.7 Transfer-Encoding $@ s" chunked" str= 0= IF
136 : pazsan 1.1 r> read-chunked EXIT THEN THEN
137 :     r> read-to-end ;
138 :    
139 :     \ convert data
140 :    
141 :     : convert-data ( -- )
142 :     \ stub
143 :     ;
144 :    
145 :     \ write response
146 :    
147 :     : write-response ( -- ) \ stub -- we really want to mirror what we got
148 :     .ok
149 :     ." Connection: close" cr
150 :     ." Accept-Ranges: bytes" cr
151 :     ." Content-Type: " Content-Type $@ type cr
152 :     ." Content-Length: " data-buffer $@len 0 .r cr cr ;
153 :    
154 :     \ write data
155 :    
156 :     : write-data ( -- )
157 :     data-buffer $@ type ;
158 :    
159 :     \ handle proxy request
160 :    
161 : pazsan 1.5 : handle-request ( fid -- )
162 : pazsan 1.1 dup >r get-response throw
163 :     r@ read-data r> close-file throw
164 :     convert-data write-response write-data ;
165 :    
166 :     \ request redirection
167 :    
168 :     wordlist Constant redirects
169 :    
170 :     Variable redir$
171 :     Variable host$
172 :    
173 :     : redirect: ( "path" host<"> redirecton<"> -- ) Create
174 :     [char] " parse here over char+ allot place
175 :     [char] " parse here over char+ allot place
176 :     DOES> ( -- addr u )
177 :     data @ IF s" GET " ELSE s" HEAD " THEN redir$ $!
178 :     count 2dup host$ $! +
179 :     count redir$ $+!
180 :     source >in @ /string dup >in +!
181 :     2dup bounds ?DO I c@ #lf = IF '/ I c! THEN LOOP
182 :     redir$ $+! redir$ $@ ;
183 :    
184 :     : (redirect?) ( addr u -- addr' u' t / f )
185 :     htmldir $! htmldir $@ bounds ?DO
186 :     I c@ '/ = IF #lf I c! THEN LOOP
187 : pazsan 1.5 redirects 1 set-order redir$ $off
188 : pazsan 1.1 htmldir $@ ['] evaluate catch
189 : pazsan 1.6 IF 2drop false ELSE redir$ @ 0<> THEN ;
190 : pazsan 1.1
191 : pazsan 1.5 : (redirect) ( -- )
192 :     host$ $@ redir$ $@ proxy-open handle-request maxnum off ;
193 : pazsan 1.1
194 :     ' (redirect?) IS redirect?
195 :     ' (redirect) IS redirect
196 :    
197 :     \ example
198 :    
199 :     redirects set-current
200 :     get-order redirects swap 1+ set-order
201 :    
202 :     Vocabulary systems
203 :    
204 :     also systems definitions
205 :    
206 : pazsan 1.5 redirect: bigforth bigforth.sourceforge.net"http://bigforth.sourceforge.net/"
207 : pazsan 1.1
208 :     previous previous definitions
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