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Annotation of gforth/proxy.fs, revision 1.3

1.1       pazsan      1: \ a http proxy
                      2: 
                      3: \ Copyright (C) 2000 Free Software Foundation, Inc.
                      4: 
                      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: Variable proxy s" localhost" proxy $!
                     40: Variable proxy-port     3128 proxy-port !
                     41: 
                     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: response: Cache-Control:
                     71: response: Connection:
                     72: response: Proxy-Connection:
                     73: response: Content-Base:
                     74: response: Content-Encoding:
                     75: response: Content-Language:
                     76: response: Content-Length:
                     77: response: Content-Location:
                     78: response: Content-MD5:
                     79: response: Content-Range:
                     80: response: Content-Type:
                     81: response: Date:
                     82: response: ETag:
                     83: response: Expires:
                     84: response: Last-modified:
                     85: response: Location:
                     86: response: Mime-Version:
                     87: response: Proxy-Authenticate:
                     88: response: Public:
                     89: response: Retry-After:
                     90: response: Server:
                     91: response: Transfer-Encoding:
                     92: response: Upgrade:
                     93: response: Via:
                     94: response: Warning:
                     95: response: WWW-Authenticate:
                     96: response: X-Cache:
                     97: response: X-Powered-By:
                     98: 
                     99: Forth definitions
                    100: 
                    101: \ response handling
                    102: 
                    103: : get-response ( fid -- ior )
                    104:     push-file loadfile !  loadline off  blk off
                    105:     response 1 set-order  ['] refill-loop catch
                    106:     only forth also  pop-file ;
                    107: 
                    108: \ data handling
                    109: 
                    110: Variable data-buffer
                    111: 
                    112: : clear-data ( -- )
                    113:     s" " data-buffer $! ;
                    114: : add-chunk ( u fid -- u' )
                    115:     swap data-buffer $@len dup >r + data-buffer $!len
                    116:     data-buffer $@ r@ /string rot read-file throw
                    117:     dup r> + data-buffer $!len ;
                    118: : read-sized ( u fid -- )
                    119:     add-chunk drop ;
                    120: : read-to-end ( fid -- )
                    121:     >r BEGIN  $1000 r@ add-chunk $1000 <> UNTIL  rdrop ;
                    122: 
                    123: : read-chunked ( fid -- ) base @ >r hex >r
                    124:     BEGIN  pad $100 r@ read-line throw  WHILE
                    125:        pad swap s>number drop dup WHILE  r@ add-chunk drop
                    126:        pad 1 r@ read-line throw  nip 0= UNTIL
                    127:     ELSE  drop  THEN  THEN  rdrop r> base ! ;
                    128: 
                    129: : read-data ( fid -- ) clear-data >r
                    130:     Content-Length @ IF
                    131:        Content-Length $@ s>number drop r> read-sized  EXIT  THEN
                    132:     Transfer-Encoding @ IF
                    133:        Transfer-Encoding $@ s" chunked" compare 0= IF
                    134:            r> read-chunked  EXIT  THEN  THEN
                    135:     r> read-to-end ;
                    136: 
                    137: \ convert data
                    138: 
                    139: : convert-data ( -- )
                    140:     \ stub
                    141: ;
                    142: 
                    143: \ write response
                    144: 
                    145: : write-response ( -- ) \ stub -- we really want to mirror what we got
                    146:     .ok
                    147:     ." Connection: close" cr
                    148:     ." Accept-Ranges: bytes" cr
                    149:     ." Content-Type: " Content-Type $@ type cr
                    150:     ." Content-Length: " data-buffer $@len 0 .r cr cr ;
                    151: 
                    152: \ write data
                    153: 
                    154: : write-data ( -- )
                    155:     data-buffer $@ type ;
                    156: 
                    157: \ handle proxy request
                    158: 
                    159: : proxy-request ( host u request u -- )
                    160:     proxy-open
                    161:     dup >r get-response throw
                    162:     r@ read-data r> close-file throw
                    163:     convert-data write-response write-data ;
                    164: 
                    165: : http-request ( host u request u -- )
                    166:     http-open
                    167:     dup >r get-response throw
                    168:     r@ read-data r> close-file throw
                    169:     convert-data write-response write-data ;
                    170: 
                    171: \ request redirection
                    172: 
                    173: wordlist Constant redirects
                    174: 
                    175: Variable redir$
                    176: Variable host$
                    177: 
                    178: : redirect: ( "path" host<"> redirecton<"> -- )  Create
                    179:     [char] " parse  here over char+ allot  place
                    180:     [char] " parse  here over char+ allot  place
                    181: DOES> ( -- addr u )
                    182:     data @ IF s" GET " ELSE s" HEAD " THEN redir$ $!
                    183:     count 2dup host$ $! +
                    184:     count redir$ $+!
                    185:     source >in @ /string dup >in +!
                    186:     2dup bounds ?DO  I c@ #lf = IF  '/ I c!  THEN  LOOP
                    187:     redir$ $+! redir$ $@ ;
                    188: 
                    189: : (redirect?) ( addr u -- addr' u' t / f )
                    190:     htmldir $! htmldir $@ bounds ?DO
                    191:        I c@ '/ = IF  #lf I c!  THEN  LOOP
                    192:     redirects 1 set-order
                    193:     htmldir $@ ['] evaluate catch
                    194:     IF  2drop false  ELSE  true  THEN ;
                    195: 
                    196: : (redirect) ( addr u -- )
                    197:     host$ $@ 2swap proxy-request maxnum off ;
                    198: 
                    199: ' (redirect?) IS redirect?
                    200: ' (redirect) IS redirect
                    201: 
                    202: \ example
                    203: 
                    204: redirects set-current
                    205: get-order redirects swap 1+ set-order
                    206: 
                    207: Vocabulary systems
                    208: 
                    209: also systems definitions
                    210: 
1.2       pazsan    211: redirect: bigforth www.jwdt.com"http://www.jwdt.com/~paysan/"
1.1       pazsan    212: 
                    213: previous previous definitions