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481 lines
16 KiB
Forth
481 lines
16 KiB
Forth
\ 1991
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include unix/socket.fs
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\ Helper words
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: +s ( addr1 u1 addr2 u2 -- addr3 u3 ) \ like s+ but prepend rather than append.
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2swap s+ ;
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: str-count ( addr1 u1 addr2 u2 -- u3 ) \ Counts occurrences of addr2 within addr1.
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2swap 0 >r
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begin 2over search
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while 2over nip /string
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r> 1+ >r
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repeat 2drop 2drop r> ;
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: -leading ( addr len -- addr' len' )
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begin over c@ bl = while 1 /string repeat ;
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: trim ( addr len -- addr' len')
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-leading -trailing ;
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: exchange ( a1 a2 -- )
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2dup c@ swap c@ rot c! swap c! ;
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: reverse ( caddr u -- ) \ reverse a string
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1- bounds begin 2dup > while
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2dup exchange
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-1 /string
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repeat 2drop ;
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: sourcedir ( -- saddr su )
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\ Returns the directory in which the file
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\ invoking the word finds itself
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\ relative to gforth's execution directory.
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\ Useful for specifying in which dir to find
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\ specific files (e.g., public/, views/).
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sourcefilename \ get the name of our file
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pad dup >r place \ copy the string so we don't
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r> count \ modify sourcefilename.
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2dup reverse \ reverse and search for first /
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s" /" search if \ if found, reverse string to
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2dup reverse \ strip the filename but keep dir.
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else
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2drop \ no slash,
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s" ./" \ same dir execution.
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then ;
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: file-exists? ( addr u -- addr u bool )
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2dup file-status nip 0= ;
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: pubvar create 0 , 0 , ;
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\ Query params
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pubvar queryString
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: set-query-string ( addr u -- )
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queryString 2! ;
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: get-query-string ( -- addr u )
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queryString 2@ ;
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: add-to-query-string ( addr u -- )
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get-query-string
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dup if \ If queryString isn't empty, add & before
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s" &" s+
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then
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+s \ adding our new query values.
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set-query-string ;
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pubvar tmpQueryString
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: set-tmp-query-string ( addr u -- )
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tmpQueryString 2! ;
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: get-tmp-query-string ( -- addr u )
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tmpQueryString 2@ ;
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: add-to-tmp-query-string ( addr u -- )
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get-tmp-query-string
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dup if \ If queryString isn't empty, add & before
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s" &" s+
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then
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+s \ adding our new query values.
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set-tmp-query-string ;
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\ Request body
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pubvar requestBody
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: set-request-body ( addr u -- )
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requestBody 2! ;
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: get-request-body ( -- addr u )
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requestBody 2@ ;
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\ Request method
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pubvar requestMethod
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: set-request-method ( addr u -- )
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requestMethod 2! ;
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: get-request-method ( -- addr u )
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requestMethod 2@ ;
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\ User-defined routing
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wordlist constant routes
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pubvar reqroute
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: set-requested-route ( addr u -- )
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reqroute 2! ;
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: get-requested-route ( -- addr u )
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reqroute 2@ ;
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: fuzzy-find-route ( xt -- xt' bool )
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\ Takes an xt that accepts a name token
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\ and returns a bool.
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\ Traverse will run as long as xt
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\ returns true.
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\ Also takes the addr u of the requested
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\ route we're trying to validate.
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>r routes wordlist-id @
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begin
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dup
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while
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r@ over >r execute WHILE r> name>link
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repeat r>
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then
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rdrop
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?dup if
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get-tmp-query-string \ Save our fuzzy vars to the request's
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add-to-query-string \ query real string.
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name>int \ Get the xt of the nt.
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-1 \ Return true.
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else
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0
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then ;
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: fuzzy-compare ( nt -- bool )
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\ Takes a route name token and returns
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\ whether that route name fuzzy matches
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\ the requested url
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s" " set-tmp-query-string \ Reset tmp query string.
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name>string \ Get the string value of the NT.
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2dup s" <" search if \ See if the route expects fuzzy matching.
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2drop \ Drop search results.
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2dup s" /" str-count >r \ Check to see if both routes have the same
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get-requested-route s" /" str-count \ number of / occurrences.
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r> = if
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2dup s" <" str-count 0 do
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2dup 2>r
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2r@
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2dup s" <" search drop \ Get position of "<",
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nip -
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nip
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get-requested-route rot /string \ crop until there in the requested route,
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2dup s" /" search if \ search for the next / or end of route,
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nip -
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else
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2drop
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then
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\ (
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2dup 2r> 2swap 2>r 2>r \ (Store a copy of the real value of <match>.)
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\ )
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2r@
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2dup s" <" search drop \ and replace <...> with the requested route word
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nip
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\ (
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2dup - 1+ 2r@ rot /string \ (Store the beginnings of user's <"match"> word.)
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2dup s" >" search drop \ (Retrieve full <"match"> user word,)
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nip - s" =" s+
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2r> 2r> 2swap 2>r
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s+ \ (and associate it with the request value,)
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add-to-tmp-query-string \ (before saving it to the tmp query string.)
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\ )
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-
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+s \ by prepending pre-< to route word
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2r> s" >" search drop 1 /string \ and then by appending post-> to route word.
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s+
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2>r \ Save string progress,
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2drop \ drop old string,
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2r> \ set new string for start of next loop (or end).
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loop
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get-requested-route compare \ Check to see if the strings match.
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else
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2drop \ Drop name>string.
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-1 \ Keep looping.
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then
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else
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2drop \ Drop search results.
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2drop \ Drop name>string.
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-1 \ Keep looping.
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then ;
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: fuzzy-match ( addr u -- xt bool )
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set-requested-route
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['] fuzzy-compare fuzzy-find-route ;
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: find-route ( addr u -- data )
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2dup 2>r
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routes search-wordlist if
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2rdrop \ Exact match found. Drop the dup string.
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>body @
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else
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2r>
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fuzzy-match if \ Fuzzy match found.
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>body @
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else
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0 \ No match at all.
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then
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then ;
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: register-route ( data addr u -- )
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2dup routes search-wordlist if
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routes drop nip nip
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>body !
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else
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routes get-current >r set-current \ switch definition word lists
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nextname create ,
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r> set-current
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then ;
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\ Public directory
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pubvar public
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: set-public-path ( addr u -- )
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public 2! ;
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: get-public-path ( -- addr u )
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public 2@ ;
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sourcedir s" public" s+ set-public-path
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\ Views directory
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pubvar views
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: set-view-path ( addr u -- )
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views 2! ;
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: get-view-path ( -- addr u )
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views 2@ ;
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sourcedir s" views/" s+ set-view-path \ Needs that trailing slash
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\ Handling views
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pubvar viewoutput
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: set-view-output ( addr u -- )
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viewoutput 2! ;
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: get-view-output ( -- addr u )
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viewoutput 2@ ;
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: parse-view ( addr u -- )
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\ Get string between <$ $> and invoke `evaluate`.
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\ Append to viewoutput as we go.
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\ There's probably a better way of doing this
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\ but it works for me.
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begin
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2dup s" <$" search if
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2over swap 2>r \ If there is a match for <$, save addr and u.
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swap >r dup >r \ Store the match and output anything that
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- \ comes before it.
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get-view-output +s
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set-view-output
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r> r> swap \ Then reinstate the match "<$...".
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2dup s" $>" search if \ Check to see if there's a closing tag $>.
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2 - \ Add the close tag to the search result.
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nip \ Save the end position of $>.
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dup >r
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- \ Reduce the string to <$ ... $>.
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evaluate \ Run user's code (maybe a bad idea?).
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r> \ Retrieve our saved end position of $>.
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r> r> \ Retrive the addr u from start of loop iter.
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rot \ Bring end $> to stack top.
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over >r \ Store the real string's length.
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- \ Subtract end $> from u to get the pos from top
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r> swap \ that we'd like to strip away. Restore saved u.
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/string \ Drop top of the string until the end of $>.
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0 \ Keep looping.
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else
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get-view-output +s \ No closing tag. Just save the full string.
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set-view-output
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2rdrop \ And drop the stored addr and u
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2drop \ as well as both the 2dup we made before
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2drop \ searching twice.
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-1 \ Exit the loop.
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then
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else
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2drop \ No match for <$. Drop the 2dup from before search.
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get-view-output +s
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set-view-output \ Save string as-is to view output
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-1 \ exit the loop
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then
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until ;
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: render-view ( addr u -- vaddr vu ) \ Accepts a view filename. Returns parsed contents.
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s" " set-view-output
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get-view-path +s
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file-exists? if
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slurp-file
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parse-view
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else
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exit \ Continue to 404, no view.
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then
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get-view-output ;
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: <$ ( -- ) ; \ Do nothing.
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: $> ( -- ) ; \ Do nothing.
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: $type ( addr u -- ) \ User-land word for outputing via views.
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get-view-output +s
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set-view-output ;
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: import ( -- ) \ User-land word for including other view files.
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get-view-path +s
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file-exists? if
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slurp-file
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parse-view
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else
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s" "
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then ;
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\ Request's Content-Type
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pubvar RequestContentType
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: set-content-type ( addr u -- )
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RequestContentType 2! ;
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: get-content-type ( -- addr u )
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RequestContentType 2@ ;
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: filetype: ( addr u "extension" -- ) \ takes a content-type and the extension
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create here over 1+ allot place
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does> count ;
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: get-filetype ( addr u -- caddr cu ) \ takes an extension, looks to find a definition
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find-name dup if
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name>int
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execute
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else
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drop
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s" text/plain"
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then ;
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s" text/plain" filetype: txt \ txt should always be defined
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s" text/html" filetype: html
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s" text/css" filetype: css
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s" text/javascript" filetype: js
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s" image/png" filetype: png
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s" image/gif" filetype: gif
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s" image/jpeg" filetype: jpg
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s" image/jpeg" filetype: jpeg
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s" image/x-icon" filetype: ico
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\ Internal request handling
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: HTTP/1.1 s" HTTP/1.1 " ;
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: response-status ( u -- addr u )
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dup case \ get status code info
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200 of s" OK" endof
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404 of s" Not Found" endof
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endcase
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s\" \n" s+
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rot s>d <# #s #> +s \ convert status code to string and prepend to info
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HTTP/1.1 +s ; \ prepend HTTP/1.1
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: content-type ( addr u -- caddr cu )
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s" Content-Type: " +s \ Prepend to the provided content type
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s\" \n\n" s+ ; \ Append 2 new lines
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: set-header ( u addr u -- raddr ru ) \ Accepts status code and content type string
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rot response-status \ Set response status
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2swap content-type \ Set content-type
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s+ ; \ Join
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: get-content-length ( addr u -- clen )
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s" Content-Length:" search if
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2dup s\" \n" search drop nip -
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s" Content-Length:" nip /string
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trim
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s>number?
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2drop
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else
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2drop
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0
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then ;
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: read-request-body ( socket u -- )
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\ Takes the socket and the length of the
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\ body (Content-Length).
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here swap aligned read-socket
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set-request-body ;
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: read-request ( socket -- addr u )
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\ Returns the request header
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\ but also collects the request body.
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dup >r
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pad 4096 read-socket
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r> dup 2over rot drop
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get-content-length ?dup if
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read-request-body
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else
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s" " set-request-body
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drop
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then ;
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: send-response ( addr u socket -- )
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dup >r write-socket r> close-socket ;
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: store-query-string ( addr u -- raddr ru )
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2dup s" ?" search if
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2dup 1 /string set-query-string \ Store query string (without leading "?").
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nip -
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else
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s" " set-query-string \ Store empty query string (reset).
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2drop
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then ;
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: requested-route ( addr u -- raddr ru )
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bl scan 1- swap 1+ swap
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2dup bl scan nip - \ get the space-separated route
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store-query-string ; \ strip and store the query, leave route
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: .extension ( addr u -- addr u )
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2dup reverse \ reverse the file name
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2dup s" ." search \ search for the first occurance of "."
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if
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nip - \ remove the "." from the search results
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else
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s" txt"
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then
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2dup reverse ; \ reverse reversed extension
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: serve-file-type ( addr u -- )
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.extension get-filetype set-content-type ;
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: serve-file ( addr u -- addr u )
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slurp-file ;
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: 404content-type txt ;
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: 404html s" 404" ;
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: valid-method? ( addr u -- addr' u' bool )
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2dup s" GET" search if
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2nip
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-1
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s" GET" set-request-method
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exit
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then
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2drop
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2dup s" POST" search if
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2nip
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-1
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s" POST" set-request-method
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exit
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then
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2drop
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2dup s" PUT" search if
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2nip
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-1
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s" PUT" set-request-method
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exit
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then
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2drop
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2dup s" DELETE" search if
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2nip
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-1
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s" DELETE" set-request-method
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exit
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then
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2drop
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0 ;
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: either-resolve ( addr u -- resolveaddr resolveu )
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valid-method? if
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s" html" get-filetype set-content-type \ reset the request's content-type
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requested-route
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2dup find-route dup if
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>r 2drop r> \ keep xt, drop the route string
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execute \ execute the user's route handler
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else
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drop \ drop the null xt
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get-public-path +s \ see if route exists in public dir
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file-exists? if
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2dup serve-file \ collect file contents
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2swap serve-file-type \ set the file type
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else
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exit \ continue to 404
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then
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then
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200 get-content-type set-header +s
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rdrop exit
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then ;
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: or-404 ( addr u -- 404addr 404u )
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2drop
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404 404content-type set-header 404html s+ ;
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: prepare-response ( addr u -- returnaddr returnu)
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either-resolve or-404 ;
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: start-server { server client }
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30000000 set-socket-timeout
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begin
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server 255 listen
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server accept-socket to client
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client read-request prepare-response client send-response
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again ;
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\ Userland
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: 1991: ( port -- )
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create-server 0 start-server ;
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: /1991 ( "<path> <word>" -- )
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bl word ' swap count register-route ;
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