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Annotation of gforth/httpd.fs, revision 1.3

1.1       pazsan      1: #! /usr/local/bin/gforth
                      2: 
                      3: warnings off
                      4: 
                      5: include string.fs
                      6: 
                      7: Variable url
                      8: Variable protocol
1.2       pazsan      9: Variable data
                     10: Variable command?
1.1       pazsan     11: 
                     12: : get ( addr -- )  name rot $! ;
                     13: : get-rest ( addr -- )  source >in @ /string dup >in +! rot $! ;
                     14: 
1.2       pazsan     15: Table constant values
                     16: Table constant commands
1.1       pazsan     17: 
1.2       pazsan     18: : value:  ( -- )  name
1.1       pazsan     19:   Forth definitions 2dup 1- nextname Variable
1.2       pazsan     20:   values set-current nextname here cell - Create ,
1.1       pazsan     21:   DOES> @ get-rest ;
1.2       pazsan     22: : >values  values 1 set-order command? off ;
1.1       pazsan     23: 
1.2       pazsan     24: \ HTTP protocol commands                               26mar00py
1.1       pazsan     25: 
1.2       pazsan     26: : rework-% ( -- )  base @ >r hex
                     27:     0 url $@len 0 ?DO
                     28:        url $@ drop I + c@ dup '% = IF
                     29:            drop 0. url $@ I 1+ /string
                     30:            2 min dup >r >number r> swap - >r 2drop
                     31:        ELSE  0 >r  THEN  over url $@ drop + c!  1+
                     32:     r> 1+ +LOOP  url $!len
                     33:     r> base ! ;
                     34: 
                     35: commands set-current
                     36: 
                     37: : GET   url get rework-% protocol get-rest >values data on  ;
                     38: : HEAD  url get rework-% protocol get-rest >values data off ;
                     39: 
                     40: \ HTTP protocol values                                 26mar00py
                     41: 
                     42: values set-current
                     43: 
                     44: value: User-Agent:
                     45: value: Pragma:
                     46: value: Host:
                     47: value: Accept:
                     48: value: Accept-Encoding:
                     49: value: Accept-Language:
                     50: value: Accept-Charset:
                     51: value: Via:
                     52: value: X-Forwarded-For:
                     53: value: Cache-Control:
                     54: value: Connection:
                     55: value: Referer:
1.1       pazsan     56: 
                     57: definitions
                     58: 
                     59: 
                     60: Variable maxnum
                     61: 
                     62: : ?cr ( -- )
                     63:   #tib @ 1 >= IF  source 1- + c@ #cr = #tib +!  THEN ;
                     64: : refill-loop ( -- flag )
                     65:   BEGIN  refill ?cr  WHILE  interpret  >in @ 0=  UNTIL
                     66:   true  ELSE  maxnum off false  THEN ;
                     67: : get-input ( -- flag ior )
1.3     ! pazsan     68:   s" /nosuchfile" url $!  s" HTTP/1.0" protocol $!
1.2       pazsan     69:   s" close" connection $!
1.3     ! pazsan     70:   infile-id push-file loadfile !  loadline off  blk off
1.2       pazsan     71:   commands 1 set-order  command? on  ['] refill-loop catch
1.1       pazsan     72:   only forth also  pop-file ;
                     73: 
                     74: \ Keep-Alive handling                                  26mar00py
                     75: 
                     76: : .connection ( -- )
                     77:   ." Connection: "
                     78:   connection $@ s" Keep-Alive" compare 0= maxnum @ 0> and
                     79:   IF  connection $@ type cr
                     80:       ." Keep-Alive: timeout=15, max=" maxnum @ 0 .r cr
                     81:       -1 maxnum +!  ELSE  ." close" cr maxnum off  THEN ;
                     82: 
                     83: \ Use Forth as server-side script language             26mar00py
                     84: 
                     85: : $> ( -- )
                     86:     BEGIN  source >in @ /string s" <$" search  0= WHILE
                     87:         type cr refill  0= UNTIL  EXIT  THEN
                     88:     nip source >in @ /string rot - dup 2 + >in +! type ;
                     89: : <HTML> ( -- )  ." <HTML>" $> ;
                     90: 
                     91: \ Rework HTML directory                                26mar00py
                     92: 
                     93: Variable htmldir
                     94: 
                     95: : rework-htmldir ( addr u -- addr' u' / ior )
                     96:   htmldir $!
                     97:   htmldir $@ 1 min s" ~" compare 0=
                     98:   IF    s" /.html-data" htmldir dup $@ 2dup '/ scan
                     99:         nip - nip $ins
                    100:   ELSE  s" /usr/local/httpd/htdocs/" htmldir 0 $ins  THEN
                    101:   htmldir $@ 1- 0 max + c@ '/ = htmldir $@len 0= or
                    102:   IF  s" index.html" htmldir dup $@len $ins  THEN
                    103:   htmldir $@ file-status nip ?dup ?EXIT
                    104:   htmldir $@ ;
                    105: 
                    106: \ MIME type handling                                   26mar00py
                    107: 
                    108: : >mime ( addr u -- mime u' )  2dup tuck over + 1- ?DO
                    109:   I c@ '. = ?LEAVE  1-  -1 +LOOP  /string ;
                    110: 
                    111: : >file ( addr u -- size fd )
                    112:   r/o bin open-file throw >r
                    113:   r@ file-size throw drop
                    114:   ." Accept-Ranges: bytes" cr
                    115:   ." Content-Length: " dup 0 .r cr r> ;
                    116: : transparent ( size fd -- ) >r
                    117:   dup allocate throw swap
                    118:   over swap r@ read-file throw over swap type
                    119:   free r> close-file throw throw ;
                    120: 
1.2       pazsan    121: : transparent: ( addr u -- ) Create  here over 1+ allot place
                    122:   DOES>  >r  >file
1.1       pazsan    123:   .connection
                    124:   ." Content-Type: "  r> count type cr cr
1.2       pazsan    125:   data @ IF  transparent  ELSE  nip close-file throw  THEN ;
1.1       pazsan    126: 
                    127: \ mime types                                           26mar00py
                    128: 
1.2       pazsan    129: : mime-read ( addr u -- )  r/o open-file throw
                    130:     push-file loadfile !  0 loadline ! blk off
                    131:     BEGIN  refill  WHILE  name
                    132:        BEGIN  >in @ >r name nip  WHILE
                    133:            r> >in ! 2dup transparent:  REPEAT
                    134:        2drop rdrop
                    135:     REPEAT  loadfile @ close-file pop-file throw ;
                    136: 
1.1       pazsan    137: : lastrequest
                    138:   ." Connection: close" cr maxnum off
                    139:   ." Content-Type: text/html" cr cr ;
                    140: 
                    141: wordlist constant mime
                    142: mime set-current
                    143: 
1.2       pazsan    144: : shtml ( addr u -- )  lastrequest
                    145:     data @ IF  included  ELSE  2drop  THEN ;
1.1       pazsan    146: 
1.2       pazsan    147: s" application/pgp-signature" transparent: sig
                    148: s" application/x-bzip2" transparent: bz2
                    149: s" application/x-gzip" transparent: gz
                    150: s" /etc/mime.types" mime-read
1.1       pazsan    151: 
                    152: definitions
                    153: 
1.2       pazsan    154: s" text/plain" transparent: txt
1.1       pazsan    155: 
                    156: \ http errors                                          26mar00py
                    157: 
1.2       pazsan    158: : .server ." Server: Gforth httpd/0.1 ("
                    159:     s" os-class" environment? IF  type  THEN  ." )" cr ;
                    160: : .ok   ." HTTP/1.1 200 OK" cr .server ;
1.1       pazsan    161: : html-error ( n addr u -- )
1.2       pazsan    162:     ." HTTP/1.1 " 2 pick . 2dup type cr .server
                    163:     2 pick &405 = IF ." Allow: GET, HEAD" cr  THEN  lastrequest
1.1       pazsan    164:     ." <HTML><HEAD><TITLE>" 2 pick . 2dup type ." </TITLE></HEAD>" cr
                    165:     ." <BODY><H1>" type drop ." </H1>" cr ;
                    166: : .trailer ( -- )
                    167:     ." <HR><ADDRESS>Gforth httpd 0.1</ADDRESS>" cr
                    168:     ." </BODY></HTML>" cr ;
1.2       pazsan    169: : .nok  command? @ IF  &405 s" Method Not Allowed"
                    170:     ELSE  &400 s" Bad Request"  THEN  html-error
1.1       pazsan    171:     ." <P>Your browser sent a request that this server could not understand.</P>" cr
                    172:     ." <P>Invalid request in: <CODE>" error-stack cell+ 2@ swap type
                    173:     ." </CODE></P>" cr .trailer ;
                    174: : .nofile  &404 s" Not Found" html-error
                    175:     ." <P>The requested URL <CODE>" url $@ type
                    176:     ." </CODE> was not found on this server</P>" cr .trailer ;
                    177: 
                    178: \ http server                                          26mar00py
                    179: 
                    180: : http  get-input  IF  .nok  ELSE
                    181:     IF  url $@ 1 /string rework-htmldir
                    182:        dup 0< IF  drop .nofile
                    183:        ELSE  .ok  2dup >mime mime search-wordlist
1.2       pazsan    184:            0= IF  ['] txt  THEN  catch IF  maxnum off THEN
1.1       pazsan    185:        THEN  THEN  THEN  outfile-id flush-file throw ;
                    186: 
                    187: : httpd  ( n -- )  maxnum !
1.3     ! pazsan    188:   BEGIN  ['] http catch  maxnum @ 0= or  UNTIL ;
1.1       pazsan    189: 
1.2       pazsan    190: script? [IF]  &100 httpd bye  [THEN]