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|
;;; "htmlform.scm" Generate HTML 2.0 forms; service CGI requests. -*-scheme-*-
; Copyright 1997, 1998 Aubrey Jaffer
;
;Permission to copy this software, to redistribute it, and to use it
;for any purpose is granted, subject to the following restrictions and
;understandings.
;
;1. Any copy made of this software must include this copyright notice
;in full.
;
;2. I have made no warrantee or representation that the operation of
;this software will be error-free, and I am under no obligation to
;provide any services, by way of maintenance, update, or otherwise.
;
;3. In conjunction with products arising from the use of this
;material, there shall be no use of my name in any advertising,
;promotional, or sales literature without prior written consent in
;each case.
(require 'sort)
(require 'scanf)
(require 'printf)
(require 'line-i/o)
(require 'parameters)
(require 'fluid-let)
(require 'dynamic-wind)
(require 'pretty-print)
(require 'object->string)
(require 'string-case)
(require 'string-port)
(require 'string-search)
(require 'database-utilities)
(require 'common-list-functions)
;;;;@code{(require 'html-form)}
;;@body Procedure names starting with @samp{html:} send their output
;;to the port @0. @0 is initially the current output port.
(define *html:output-port* (current-output-port))
(define (html:printf . args) (apply fprintf *html:output-port* args))
;;@body Returns a string with character substitutions appropriate to
;;send @1 as an @dfn{attribute-value}.
(define (make-atval txt) ; attribute-value
(if (symbol? txt) (set! txt (symbol->string txt)))
(if (number? txt)
(number->string txt)
(string-subst (if (string? txt) txt (object->string txt))
"&" "&"
"\"" """
"<" "<"
">" ">")))
;;@body Returns a string with character substitutions appropriate to
;;send @1 as an @dfn{plain-text}.
(define (make-plain txt) ; plain-text `Data Characters'
(if (symbol? txt) (set! txt (symbol->string txt)))
(if (number? txt)
(number->string txt)
(string-subst (if (string? txt) txt (object->string txt))
"&" "&"
"<" "<"
">" ">")))
;;@args title backlink tags ...
;;@args title backlink
;;@args title
;;
;;Outputs headers for an HTML page named @1. If string arguments @2
;;... are supplied they are printed verbatim within the @t{<HEAD>}
;;section.
(define (html:start-page title . args)
(define backlink (if (null? args) #f (car args)))
(if (not (null? args)) (set! args (cdr args)))
(html:printf "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 3.2 Final//EN\">\\n")
(html:printf "<HTML>\\n")
(html:comment "HTML by SLIB"
"http://swissnet.ai.mit.edu/~jaffer/SLIB.html")
(html:printf "<HEAD>%s<TITLE>%s</TITLE></HEAD>\\n"
(apply string-append args) (make-plain title))
(html:printf "<BODY><H1>%s</H1>\\n"
(or backlink (make-plain title))))
;;@body Outputs HTML codes to end a page.
(define (html:end-page)
(html:printf "</BODY>\\n")
(html:printf "</HTML>\\n"))
;;@body Writes (using @code{html:printf}) the strings @1, @2 as
;;@dfn{PRE}formmated plain text (rendered in fixed-width font).
;;Newlines are inserted between @1, @2. HTML tags (@samp{<tag>})
;;within @2 will be visible verbatim.
(define (html:pre line1 . lines)
(html:printf "<PRE>\\n%s" (make-plain line1))
(for-each (lambda (line) (html:printf "\\n%s" (make-plain line))) lines)
(html:printf "</PRE>\\n"))
;;@body Writes (using @code{html:printf}) the strings @1 as HTML
;;comments.
(define (html:comment line1 . lines)
(html:printf "<!")
(if (substring? "--" line1)
(slib:error 'html:comment "line contains --" line1)
(html:printf "--%s--" line1))
(for-each (lambda (line)
(if (substring? "--" line)
(slib:error 'html:comment "line contains --" line)
(html:printf "\\n --%s--" line)))
lines)
(html:printf ">\\n"))
;;@section HTML Tables
;;@body
(define (html:start-table caption)
(html:printf "<TABLE BORDER WIDTH=\"100%%\">\\n")
(html:printf "<CAPTION ALIGN=BOTTOM>%s</CAPTION>\\n" (make-plain caption)))
;;@body
(define (html:end-table)
(html:printf "</TABLE>\\n"))
;;@body Outputs a heading row for the currently-started table.
(define (html:heading columns)
(html:printf "<TR VALIGN=\"TOP\">\\n")
(for-each (lambda (datum) (html:printf "<TH>%s\\n" (or datum ""))) columns))
;;@body Outputs a heading row with column-names @1 linked to URLs @2.
(define (html:href-heading columns urls)
(html:heading
(map (lambda (column url)
(if url
(sprintf #f "<A HREF=\"%s\">%s</A>" url column)
column))
columns urls)))
;;@args k foreigns
;;
;;The positive integer @1 is the primary-key-limit (number of
;;primary-keys) of the table. @2 is a list of the filenames of
;;foreign-key field pages and #f for non foreign-key fields.
;;
;;@0 returns a procedure taking a row for its single argument. This
;;returned procedure prints the table row to @var{*html:output-port*}.
(define (make-row-converter pkl foreigns)
(lambda (data-row)
(define anchored? #f)
(define (present datum)
(cond ((or (string? datum) (symbol? datum))
(html:printf "%s" (make-plain datum)))
(else
(html:printf
"<PRE>\\n%s</PRE>\\n"
(make-plain (call-with-output-string
(lambda (port)
(pretty-print datum port))))))))
(html:printf "<TR VALIGN=\"TOP\">")
(for-each (lambda (datum foreign)
(html:printf "<TD>")
(cond ((not datum))
((null? datum))
((not anchored?)
(html:printf "<A NAME=\"")
(cond
((zero? pkl)
(html:printf "%s" (make-atval datum)))
(else (html:printf
"%s" (make-atval (car data-row)))
(do ((idx 1 (+ 1 idx))
(contents (cdr data-row) (cdr contents)))
((>= idx pkl))
(html:printf
" %s" (make-atval (car contents))))))
(html:printf "\">")
(set! anchored? (not (zero? pkl)))))
(cond ((not datum)) ((null? datum))
((not foreign) (present datum))
((zero? pkl)
(html:printf "<A HREF=\"%s\">" foreign)
(present datum)
(html:printf "</A>"))
(else
(html:printf "<A HREF=\"%s#%s\">"
foreign (make-atval datum))
(present datum)
(html:printf "</A>"))))
data-row foreigns)
(html:printf "\\n")))
;;@body
;;Returns the symbol @1 converted to a filename.
(define (table-name->filename table-name)
(and table-name (string-append
(string-subst (symbol->string table-name) "*" "" ":" "_")
".html")))
(define (table-name->column-table-name db table-name)
((((db 'open-table) '*catalog-data* #f) 'get 'coltab-name)
table-name))
;;@args caption db table-name match-key1 @dots{}
;;Writes HTML for @2 table @3 to @var{*html:output-port*}.
;;
;;The optional @4 @dots{} arguments restrict actions to a subset of
;;the table. @xref{Table Operations, match-key}.
(define (table->html caption db table-name . args)
(let* ((table ((db 'open-table) table-name #f))
(foreigns (table 'column-foreigns))
(tags (map table-name->filename foreigns))
(names (table 'column-names))
(primlim (table 'primary-limit)))
(html:start-table caption)
(html:href-heading
names
(append (make-list primlim (table-name->filename
(table-name->column-table-name db table-name)))
(make-list (- (length names) primlim) #f)))
(html:heading (table 'column-domains))
(html:href-heading foreigns tags)
(html:heading (table 'column-types))
(apply (table 'for-each-row) (make-row-converter primlim tags) args)
(html:end-table)))
;;@body
;;Writes a complete HTML page to @var{*html:output-port*}. The string
;;@3 names the page which refers to this one.
(define (table->page db table-name index-filename)
(dynamic-wind
(lambda ()
(if index-filename
(html:start-page
table-name
(sprintf #f "<A HREF=\"%s#%s\">%s</A>"
index-filename
(make-atval table-name)
(make-plain table-name)))
(html:start-page table-name)))
(lambda () (table->html table-name db table-name))
html:end-page))
;;@body
;;Writes HTML for the catalog table of @1 to @var{*html:output-port*}.
(define (catalog->html db caption)
(html:start-table caption)
(html:heading '(table columns))
((((db 'open-table) '*catalog-data* #f) 'for-each-row)
(lambda (row)
(cond ((and (eq? '*columns* (caddr row))
(not (eq? '*columns* (car row)))))
(else ((make-row-converter
0 (list (table-name->filename (car row))
(table-name->filename (caddr row))))
(list (car row) (caddr row))))))))
;;@body
;;Writes a complete HTML page for the catalog of @1 to
;;@var{*html:output-port*}.
(define (catalog->page db caption)
(dynamic-wind
(lambda () (html:start-page caption))
(lambda ()
(catalog->html db caption)
(html:end-table))
html:end-page))
;;@section HTML Forms
(define (html:dt-strong-doc name doc)
(if (and (string? doc) (not (equal? "" doc)))
(html:printf "<DT><STRONG>%s</STRONG> (%s)\\n"
(make-plain name) (make-plain doc))
(html:printf "<DT><STRONG>%s</STRONG>\\n" (make-plain name))))
(define (html:checkbox name doc pname)
(html:printf "<DT><INPUT TYPE=CHECKBOX NAME=%#a VALUE=T>\\n"
(make-atval pname))
(if (and (string? doc) (not (equal? "" doc)))
(html:printf "<DD><STRONG>%s</STRONG> (%s)\\n"
(make-plain name) (make-plain doc))
(html:printf "<DD><STRONG>%s</STRONG>\\n" (make-plain name))))
(define (html:text name doc pname default)
(cond (default
(html:dt-strong-doc name doc)
(html:printf "<DD><INPUT NAME=%#a SIZE=%d VALUE=%#a>\\n"
(make-atval pname)
(max 20 (string-length
(if (symbol? default)
(symbol->string default) default)))
(make-atval default)))
(else
(html:dt-strong-doc name doc)
(html:printf "<DD><INPUT NAME=%#a>\\n" (make-atval pname)))))
(define (html:text-area name doc pname default-list)
(html:dt-strong-doc name doc)
(html:printf "<DD><TEXTAREA NAME=%#a ROWS=%d COLS=%d>\\n"
(make-atval pname) (max 2 (length default-list))
(apply max 32 (map (lambda (d) (string-length
(if (symbol? d)
(symbol->string d)
d)))
default-list)))
(for-each (lambda (line) (html:printf "%s\\n" (make-plain line))) default-list)
(html:printf "</TEXTAREA>\\n"))
(define (html:s<? s1 s2)
(if (and (number? s1) (number? s2))
(< s1 s2)
(string<? (if (symbol? s1) (symbol->string s1) s1)
(if (symbol? s2) (symbol->string s2) s2))))
(define (html:select name doc pname arity default-list value-list)
(set! value-list (sort! value-list html:s<?))
(html:dt-strong-doc name doc)
(html:printf "<DD><SELECT NAME=%#a SIZE=%d%s>\\n"
(make-atval pname)
(case arity
((single optional) 1)
((nary nary1) 5))
(case arity
((nary nary1) " MULTIPLE")
(else "")))
(for-each (lambda (value)
(html:printf "<OPTION VALUE=%#a%s>%s\\n"
(make-atval value)
(if (member value default-list)
" SELECTED" "")
(make-plain value)))
(case arity
((optional nary) (cons (string->symbol "") value-list))
(else value-list)))
(html:printf "</SELECT>\\n"))
(define (html:buttons name doc pname arity default-list value-list)
(set! value-list (sort! value-list html:s<?))
(html:dt-strong-doc name doc)
(html:printf "<DD><MENU>")
(case arity
((single optional)
(for-each (lambda (value)
(html:printf
"<LI><INPUT TYPE=RADIO NAME=%#a VALUE=%#a%s> %s\\n"
(make-atval pname) (make-atval value)
(if (member value default-list) " CHECKED" "")
(make-plain value)))
value-list))
((nary nary1)
(for-each (lambda (value)
(html:printf
"<LI><INPUT TYPE=CHECKBOX NAME=%#a VALUE=%#a%s> %s\\n"
(make-atval pname) (make-atval value)
(if (member value default-list) " CHECKED" "")
(make-plain value)))
value-list)))
(html:printf "</MENU>"))
;;@body The symbol @1 is either @code{get}, @code{head}, @code{post},
;;@code{put}, or @code{delete}. @0 prints the header for an HTML
;;@dfn{form}.
(define (html:start-form method action)
(cond ((not (memq method '(get head post put delete)))
(slib:error 'html:start-form "method unknown:" method)))
(html:printf "<FORM METHOD=%#a ACTION=%#a>\\n"
(make-atval method) (make-atval action))
(html:printf "<DL>\\n"))
;;@body @0 prints the footer for an HTML @dfn{form}. The string @2
;;appears on the button which submits the form.
(define (html:end-form pname submit-label)
(html:printf "</DL>\\n")
(html:printf "<INPUT TYPE=SUBMIT NAME=%#a VALUE=%#a> <INPUT TYPE=RESET>\\n"
(make-atval '*command*) (make-atval submit-label))
(html:printf "</FORM><HR>\\n"))
(define (html:generate-form comname method action docu pnames docs aliases
arities types default-lists value-lists)
(define aliast (map list pnames))
(for-each (lambda (alias) (if (> (string-length (car alias)) 1)
(let ((apr (assq (cadr alias) aliast)))
(set-cdr! apr (cons (car alias) (cdr apr))))))
aliases)
(dynamic-wind
(lambda ()
(html:printf "<H2>%s:</H2><BLOCKQUOTE>%s</BLOCKQUOTE>\\n"
(make-plain comname) (make-plain docu))
(html:start-form 'post action))
(lambda ()
(for-each
(lambda (pname doc aliat arity default-list value-list)
(define longname
(remove-if (lambda (s) (= 1 (string-length s))) (cdr aliat)))
(set! longname (if (null? longname) #f (car longname)))
(cond (longname
(case (length value-list)
((0) (case arity
((boolean) (html:checkbox longname doc pname 'Y))
((single optional)
(html:text longname doc pname
(if (null? default-list)
#f (car default-list))))
(else
(html:text-area longname doc pname default-list))))
((1) (html:checkbox longname doc pname (car value-list)))
(else ((case arity
((single optional) html:select)
(else html:buttons))
longname doc pname arity default-list value-list))))))
pnames docs aliast arities default-lists value-lists))
(lambda ()
(html:end-form comname comname))))
;;@body The symbol @2 names a command table in the @1 relational
;;database.
;;
;;@0 writes an HTML-2.0 @dfn{form} for command @3 to the
;;current-output-port. The @samp{SUBMIT} button, which is labeled @3,
;;invokes the URI @5 with method @4 with a hidden attribute
;;@code{*command*} bound to the command symbol submitted.
;;
;;An action may invoke a CGI script
;;(@samp{http://www.my-site.edu/cgi-bin/search.cgi}) or HTTP daemon
;;(@samp{http://www.my-site.edu:8001}).
;;
;;This example demonstrates how to create a HTML-form for the @samp{build}
;;command.
;;
;;@example
;;(require (in-vicinity (implementation-vicinity) "build.scm"))
;;(call-with-output-file "buildscm.html"
;; (lambda (port)
;; (fluid-let ((*html:output-port* port))
;; (html:start-page 'commands)
;; (command->html
;; build '*commands* 'build 'post
;; (or "/cgi-bin/build.cgi"
;; "http://localhost:8081/buildscm"))
;; html:end-page)))
;;@end example
(define (command->html rdb command-table command method action)
(define rdb-open (rdb 'open-table))
(define (row-refer idx) (lambda (row) (list-ref row idx)))
(let ((comtab (rdb-open command-table #f))
(domain->type ((rdb-open '*domains-data* #f) 'get 'type-id))
(get-domain-choices
(let ((for-tab-name
((rdb-open '*domains-data* #f) 'get 'foreign-table)))
(lambda (domain-name)
(define tab-name (for-tab-name domain-name))
(if tab-name
(do ((dlst (((rdb-open tab-name #f) 'get* 1)) (cdr dlst))
(out '() (if (member (car dlst) (cdr dlst))
out (cons (car dlst) out))))
((null? dlst) out))
'())))))
(define row-ref
(let ((names (comtab 'column-names)))
(lambda (row name) (list-ref row (position name names)))))
(let* ((command:row ((comtab 'row:retrieve) command))
(parameter-table (rdb-open (row-ref command:row 'parameters) #f))
(pcnames (parameter-table 'column-names))
(param-rows (sort! ((parameter-table 'row:retrieve*))
(lambda (r1 r2) (< (car r1) (car r2))))))
(let ((domains (map (row-refer (position 'domain pcnames)) param-rows))
(parameter-names
(rdb-open (row-ref command:row 'parameter-names) #f)))
(html:generate-form
command
method
action
(row-ref command:row 'documentation)
(map (row-refer (position 'name pcnames)) param-rows)
(map (row-refer (position 'documentation pcnames)) param-rows)
(map list ((parameter-names 'get* 'name))
(map (parameter-table 'get 'name)
((parameter-names 'get* 'parameter-index))))
(map (row-refer (position 'arity pcnames)) param-rows)
(map domain->type domains)
(map cdr (fill-empty-parameters
(map slib:eval
(map (row-refer (position 'defaulter pcnames))
param-rows))
(make-parameter-list
(map (row-refer (position 'name pcnames)) param-rows))))
(map get-domain-choices domains))))))
(define (cgi:process-% str)
(define len (string-length str))
(define (sub str)
(cond
((string-index str #\%)
=> (lambda (idx)
(if (and (< (+ 2 idx) len)
(string->number (substring str (+ 1 idx) (+ 2 idx)) 16)
(string->number (substring str (+ 2 idx) (+ 3 idx)) 16))
(string-append
(substring str 0 idx)
(string (integer->char
(string->number
(substring str (+ 1 idx) (+ 3 idx))
16)))
(sub (substring str (+ 3 idx) (string-length str)))))))
(else str)))
(sub str))
(define (form:split-lines txt)
(let ((idx (string-index txt #\newline))
(carriage-return (integer->char #xd)))
(if idx
(cons (substring txt 0
(if (and (positive? idx)
(char=? carriage-return
(string-ref txt (+ -1 idx))))
(+ -1 idx)
idx))
(form:split-lines
(substring txt (+ 1 idx) (string-length txt))))
(list txt))))
(define (form-urlencoded->query-alist txt)
(if (symbol? txt) (set! txt (symbol->string txt)))
(set! txt (string-subst txt " " "" "+" " "))
(do ((lst '())
(edx (string-index txt #\=)
(string-index txt #\=)))
((not edx) lst)
(let* ((rxt (substring txt (+ 1 edx) (string-length txt)))
(adx (string-index rxt #\&))
(name (cgi:process-% (substring txt 0 edx))))
(set!
lst (append
lst
(map
(lambda (value) (list (string->symbol name)
(if (equal? "" value) #f value)))
(form:split-lines
(cgi:process-% (substring rxt 0 (or adx (string-length rxt))))))))
(set! txt (if adx (substring rxt (+ 1 adx) (string-length rxt)) "")))))
(define (query-alist->parameter-list alist optnames arities types)
(define (can-take-arg? opt)
(not (eq? (list-ref arities (position opt optnames)) 'boolean)))
(let ((parameter-list (make-parameter-list optnames)))
(for-each
(lambda (lst)
(let* ((value (cadr lst))
(name (car lst)))
(cond ((not (can-take-arg? name))
(adjoin-parameters! parameter-list (list name #t)))
(value
(adjoin-parameters!
parameter-list
(let ((type (list-ref types (position name optnames))))
(case type
((expression) (list name value))
((symbol)
(if (string? value)
(call-with-input-string
value
(lambda (port)
(do ((tok (scanf-read-list " %s" port)
(scanf-read-list " %s" port))
(lst '()
(cons (string-ci->symbol (car tok))
lst)))
((or (null? tok) (eof-object? tok))
(cons name lst)))))
(list name (coerce value type))))
(else (list name (coerce value type))))))))))
alist)
parameter-list))
;;@c node HTTP and CGI service, Printing Scheme, HTML Forms, Textual Conversion Packages
;;@section HTTP and CGI service
;;@code{(require 'html-form)}
;;;; Now that we have generated the HTML form, process the ensuing CGI request.
;;@body Reads a @samp{"POST"} or @samp{"GET"} query from
;;@code{(current-input-port)} and executes the encoded command from @2
;;in relational-database @1.
;;
;;This example puts up a plain-text page in response to a CGI query.
;;
;;@example
;;(display "Content-Type: text/plain") (newline) (newline)
;;(require 'html-form)
;;(load (in-vicinity (implementation-vicinity) "build.scm"))
;;(cgi:serve-command build '*commands*)
;;@end example
(define (cgi:serve-command rdb command-table)
(serve-urlencoded-command rdb command-table (cgi:read-query-string)))
;;@body Reads attribute-value pairs from @3, converts them to
;;parameters and invokes the @1 command named by the parameter
;;@code{*command*}.
(define (serve-urlencoded-command rdb command-table urlencoded)
(let* ((alist (form-urlencoded->query-alist urlencoded))
(comname #f)
(comtab ((rdb 'open-table) command-table #f))
(names (comtab 'column-names))
(row-ref (lambda (row name) (list-ref row (position name names))))
(comgetrow (comtab 'row:retrieve)))
(set! alist (remove-if (lambda (elt)
(cond ((not (and (list? elt) (pair? elt)
(eq? '*command* (car elt)))) #f)
(comname
(slib:error
'serve-urlencoded-command
'more-than-one-command? comname
(string->symbol (cadr elt))))
(else (set! comname
(string-ci->symbol (cadr elt)))
#t)))
alist))
(let* ((command:row (comgetrow comname))
(parameter-table ((rdb 'open-table)
(row-ref command:row 'parameters) #f))
(comval ((slib:eval (row-ref command:row 'procedure)) rdb))
(options ((parameter-table 'get* 'name)))
(positions ((parameter-table 'get* 'index)))
(arities ((parameter-table 'get* 'arity)))
(defaulters (map slib:eval ((parameter-table 'get* 'defaulter))))
(domains ((parameter-table 'get* 'domain)))
(types (map (((rdb 'open-table) '*domains-data* #f) 'get 'type-id)
domains))
(dirs (map (rdb 'domain-checker) domains)))
(let* ((params (query-alist->parameter-list alist options arities types))
(fparams (fill-empty-parameters defaulters params)))
(and (list? fparams) (check-parameters dirs fparams)
(comval fparams))))))
(define (serve-query-alist-command rdb command-table alist)
(let ((command #f))
(set! alist (remove-if (lambda (elt)
(cond ((not (and (list? elt) (pair? elt)
(eq? '*command* (car elt)))) #f)
(command
(slib:error
'serve-query-alist-command
'more-than-one-command? command
(string->symbol (cadr elt))))
(else (set! command
(string-ci->symbol (cadr elt)))
#t)))
alist))
((make-command-server rdb command-table)
command
(lambda (comname comval options positions
arities types defaulters dirs aliases)
(let* ((params (query-alist->parameter-list alist options arities types))
(fparams (fill-empty-parameters defaulters params)))
(and (list? fparams) (check-parameters dirs fparams)
(apply comval
(parameter-list->arglist positions arities fparams))))))))
(define http:crlf (string (integer->char 13) #\newline))
(define (http:read-header port)
(define alist '())
(do ((line (read-line port) (read-line port)))
((or (zero? (string-length line))
(and (= 1 (string-length line))
(char-whitespace? (string-ref line 0)))
(eof-object? line))
(if (and (= 1 (string-length line))
(char-whitespace? (string-ref line 0)))
(set! http:crlf (string (string-ref line 0) #\newline)))
(if (eof-object? line) line alist))
(let ((len (string-length line))
(idx (string-index line #\:)))
(if (char-whitespace? (string-ref line (+ -1 len)))
(set! len (+ -1 len)))
(and idx (do ((idx2 (+ idx 1) (+ idx2 1)))
((or (>= idx2 len)
(not (char-whitespace? (string-ref line idx2))))
(set! alist
(cons
(cons (string-ci->symbol (substring line 0 idx))
(substring line idx2 len))
alist)))))
;;Else -- ignore malformed line
;;(else (slib:error 'http:read-header 'malformed-input line))
)))
(define (http:read-query-string request-line header port)
(case (car request-line)
((get head)
(let* ((request-uri (cadr request-line))
(len (string-length request-uri)))
(and (> len 3)
(string-index request-uri #\?)
(substring request-uri
(+ 1 (string-index request-uri #\?))
(if (eqv? #\/ (string-ref request-uri (+ -1 len)))
(+ -1 len)
len)))))
((post put delete)
(let ((content-length (assq 'content-length header)))
(and content-length
(set! content-length (string->number (cdr content-length))))
(and content-length
(let ((str (make-string content-length #\ )))
(do ((idx 0 (+ idx 1)))
((>= idx content-length)
(if (>= idx (string-length str)) str (substring str 0 idx)))
(let ((chr (read-char port)))
(if (char? chr)
(string-set! str idx chr)
(set! content-length idx))))))))
(else #f)))
(define (http:send-status-line status-code reason)
(html:printf "HTTP/1.1 %d %s%s" status-code reason http:crlf))
(define (http:send-header alist)
(for-each (lambda (pair)
(html:printf "%s: %s%s" (car pair) (cdr pair) http:crlf))
alist)
(html:printf http:crlf))
(define *http:byline*
"<A HREF=http://swissnet.ai.mit.edu/~jaffer/SLIB.html>SLIB </A>HTTP/1.1 server")
(define (http:send-error-page code str port)
(fluid-let ((*html:output-port* port))
(http:send-status-line code str)
(http:send-header '(("Content-Type" . "text/html")))
(html:start-page (sprintf #f "%d %s" code str))
(and *http:byline* (html:printf "<HR>\\n%s\\n" *http:byline*))
(html:end-page)))
;;@body reads the @dfn{query-string} from @1. If this is a valid
;;@samp{"POST"} or @samp{"GET"} query, then @0 calls @3 with two
;;arguments, the query-string and the header-alist.
;;
;;Otherwise, @0 replies (to @2) with appropriate HTML describing the
;;problem.
(define (http:serve-query input-port output-port serve-proc)
(let ((request-line (http:read-request-line input-port)))
(cond ((not request-line)
(http:send-error-page 400 "Bad Request" output-port))
((string? (car request-line))
(http:send-error-page 501 "Not Implemented" output-port))
((not (case (car request-line)
((get post) #t)
(else #f)))
(http:send-error-page 405 "Method Not Allowed" output-port))
(else (let* ((header (http:read-header input-port))
(query-string
(http:read-query-string
request-line header input-port)))
(cond ((not query-string)
(http:send-error-page 400 "Bad Request" output-port))
(else (http:send-status-line 200 "OK")
(serve-proc query-string header))))))))
;;@ This example services HTTP queries from port 8081:
;;
;;@example
;;(define socket (make-stream-socket AF_INET 0))
;;(socket:bind socket 8081)
;;(socket:listen socket 10)
;;(dynamic-wind
;; (lambda () #f)
;; (lambda ()
;; (do ((port (socket:accept socket)
;; (socket:accept socket)))
;; (#f)
;; (dynamic-wind
;; (lambda () #f)
;; (lambda ()
;; (fluid-let ((*html:output-port* port))
;; (http:serve-query
;; port port
;; (lambda (query-string header)
;; (http:send-header
;; '(("Content-Type" . "text/plain")))
;; (with-output-to-port port
;; (lambda ()
;; (serve-urlencoded-command
;; build '*commands* query-string)))))))
;; (lambda () (close-port port)))))
;; (lambda () (close-port socket)))
;;@end example
(define (http:read-start-line port)
(do ((line (read-line port) (read-line port)))
((or (not (equal? "" line)) (eof-object? line)) line)))
;;@body Reads the first non-blank line from @1 and, if successful,
;;returns a list of three itmes from the request-line:
;;
;;@enumerate 0
;;
;;@item Method
;;
;;Either one of the symbols @code{options}, @code{get}, @code{head},
;;@code{post}, @code{put}, @code{delete}, or @code{trace}; Or a string.
;;
;;@item Request-URI
;;
;;A string. At the minimum, it will be the string @samp{"/"}.
;;
;;@item HTTP-Version
;;
;;A string. For example, @samp{HTTP/1.0}.
;;@end enumerate
(define (http:read-request-line port)
(let ((lst (scanf-read-list "%s %s %s %s" (http:read-start-line port))))
(and (list? lst)
(= 3 (length lst))
(let ((method
(assoc
(car lst)
'(("OPTIONS" . options) ; Section 9.2
("GET" . get) ; Section 9.3
("HEAD" . head) ; Section 9.4
("POST" . post) ; Section 9.5
("PUT" . put) ; Section 9.6
("DELETE" . delete) ; Section 9.7
("TRACE" . trace) ; Section 9.8
))))
(cons (if (pair? method) (cdr method) (car lst)) (cdr lst))))))
;;@body Reads the @dfn{query-string} from @code{(current-input-port)}.
;;@0 reads a @samp{"POST"} or @samp{"GET"} queries, depending on the
;;value of @code{(getenv "REQUEST_METHOD")}.
(define (cgi:read-query-string)
(define request-method (getenv "REQUEST_METHOD"))
(cond ((and request-method (string-ci=? "GET" request-method))
(getenv "QUERY_STRING"))
((and request-method (string-ci=? "POST" request-method))
(let ((content-length (getenv "CONTENT_LENGTH")))
(and content-length
(set! content-length (string->number content-length)))
(and content-length
(let ((str (make-string content-length #\ )))
(do ((idx 0 (+ idx 1)))
((>= idx content-length)
(if (>= idx (string-length str))
str
(substring str 0 idx)))
(let ((chr (read-char)))
(if (char? chr)
(string-set! str idx chr)
(set! content-length idx))))))))
(else #f)))
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