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Adding fastcgi library

This commit is contained in:
retropikzel 2026-01-17 10:33:44 +02:00
parent a88dd28348
commit 42753c1b18
19 changed files with 1254 additions and 134 deletions
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16
lighttpd.conf Normal file
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@ -0,0 +1,16 @@
server.document-root = "/your-project-path"
server.errorlog = "/your-project-path/error.log"
server.modules = ("mod_scgi")
server.port = 3000
scgi.debug = 1
scgi.server = ("/" =>
(( "host" => "127.0.0.1",
"port" => 3001,
"check-local" => "disable")))
mimetype.assign = (
".html" => "text/html",
".txt" => "text/plain",
".jpg" => "image/jpeg",
".png" => "image/png")

156
retropikzel/cgi.scm
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@ -1,96 +1,5 @@
(define stdin (open-binary-input-file "/dev/fd/0")) (define stdin (open-binary-input-file "/dev/fd/0"))
(define buffer-size 4000) (define buffer-size 4000)
(define temporary-directory (if (get-environment-variable "SCHEME_CGI_TMP_PATH")
(get-environment-variable "SCHEME_CGI_TMP_PATH")
"/tmp"))
(define file-move-buffer-size 4000)
(define encode-replacements
(list (list " " "%20")
(list " " "+")
(list "!" "%21")
(list "#" "%23")
(list "$" "%24")
(list "%" "%25")
(list "&" "%26")
(list "'" "%27")
(list "(" "%28")
(list ")" "%29")
(list "*" "%2A")
(list "+" "%2B")
(list "," "%2C")
(list "/" "%2F")
(list ":" "%3A")
(list ";" "%3B")
(list "=" "%3D")
(list "?" "%3F")
(list "@" "%40")
(list "[" "%5B")
(list "]" "%5D")
(list "<" "%3C")
(list ">" "%3E")
(list "\\" "%5C")
(list "\"" "%22")
(list "\n" "%0A")
(list "\r" "%0D")))
(define decode-replacements (map reverse encode-replacements))
(define make-temp-filename
(lambda (filename)
(letrec* ((dev-random (open-binary-input-file "/dev/random"))
(min-byte (char->integer #\a))
(max-byte (char->integer #\z))
(max-length 10)
(looper (lambda (result count)
(if (>= count max-length)
result
(let ((byte (read-u8 dev-random)))
(if (and (> byte min-byte) (< byte max-byte))
(looper (bytevector-append result
(bytevector byte))
(+ count 1))
(looper result count))))))
(result (string-append (utf8->string (looper (bytevector) 0))
"_"
(utf8->string (looper (bytevector) 0))
"_"
filename)))
(close-port dev-random)
result)))
#;(define headers->string
(lambda (headers)
(apply string-append (map
(lambda (key-value)
(string-append (car key-value) ": " (cdr key-value) "\r\n"))
headers))))
(define get-replacement
(lambda (key mode)
(let ((r (if (string=? mode "encode")
(assoc key encode-replacements)
(assoc key decode-replacements))))
(if r (car (cdr r)) key))))
(define endecode
(lambda (mode s)
(if (not s)
""
(letrec ((s-length (string-length s))
(looper
(lambda (i result)
(if (< i s-length)
(let ((key-length (if (and (string=? mode "decode")
(string=? (string-copy s i (+ i 1)) "%")
(> s-length (+ i 2)))
3
1)))
(looper (+ i key-length)
(string-append result
(get-replacement
(string-copy s i (+ i key-length))
mode))))
result))))
(looper 0 "")))))
(define string-split (define string-split
(lambda (str mark) (lambda (str mark)
@ -191,47 +100,13 @@
(define breaker (char->integer #\-)) (define breaker (char->integer #\-))
(define cgi-clean
#;(define request
(list (cons 'headers headers)
(cons 'parameters parameters)
(cons 'cookies cookies)
(cons 'body body)
(cons 'files files)))
(define (get from key)
(let ((value (assoc (if (string? key)
(string->symbol (endecode "encode" key))
key)
from)))
(if value (cdr value) #f)))
(define (get-file file)
(let ((value (assoc (endecode "encode" (if (symbol? file)
(symbol->string file)
file))
files)))
(if value (cdr value) #f)))
(define (move-file from to)
(letrec* ((input (open-binary-input-file from))
(output (open-binary-output-file to))
(looper (lambda (bytes)
(when (not (eof-object? bytes))
(write-bytevector bytes output)
(looper (read-bytevector file-move-buffer-size input))))))
(looper (read-bytevector file-move-buffer-size input))
(close-port input)
(close-port output)))
(define cgi-exit
(lambda args (lambda args
(for-each (lambda (file) (for-each (lambda (file)
(let ((path (cdr file))) (let ((path (cdr file)))
(when (file-exists? path) (when (file-exists? path)
(delete-file path)))) (delete-file path))))
files) files)))
(if (null? args)
(exit 0)
(exit (car args)))))
(define (cgi) (define (cgi)
(cond ((and content-type-pair (string=? content-type "multipart/form-data")) (cond ((and content-type-pair (string=? content-type "multipart/form-data"))
@ -287,9 +162,7 @@
(utf8->string (bytevector-copy content (utf8->string (bytevector-copy content
(+ (+ content-mark part-headers-length) 2) (+ (+ content-mark part-headers-length) 2)
(- index 2))))))) (- index 2)))))))
(let* ((tmp-file-path (string-append temporary-directory (let* ((tmp-file-path (make-temp-filename (cdr filename)))
"/"
(make-temp-filename (cdr filename))))
(tmp-file-port (begin (when (file-exists? tmp-file-path) (tmp-file-port (begin (when (file-exists? tmp-file-path)
(delete-file tmp-file-path)) (delete-file tmp-file-path))
(open-binary-output-file tmp-file-path)))) (open-binary-output-file tmp-file-path))))
@ -319,3 +192,26 @@
(cons 'cookies cookies) (cons 'cookies cookies)
(cons 'body body) (cons 'body body)
(cons 'files files))) (cons 'files files)))
(define (write-to-string str)
(let ((port (open-output-string)))
(write str port)
(get-output-string port)))
(define (handle-request options thunk)
(let* ((request (cgi)))
(with-exception-handler
(lambda (exn) (cgi-clean) #f)
(lambda ()
(display
(parameterize
((current-output-port (open-output-string)))
(apply thunk
(list request
(cdr (assq 'headers request))
(cdr (assq 'parameters request))
(cdr (assq 'cookies request))
(cdr (assq 'body request))
(cdr (assq 'files request))))
(get-output-string (current-output-port))))))
(cgi-clean)))

6
retropikzel/cgi.sld
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@ -6,7 +6,7 @@
(scheme write) (scheme write)
(scheme file) (scheme file)
(scheme char) (scheme char)
(scheme process-context)) (scheme process-context)
(export cgi (retropikzel net))
cgi-exit) (export handle-request)
(include "cgi.scm")) (include "cgi.scm"))

2
retropikzel/cgi/VERSION
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@ -1 +1 @@
1.0.1 1.1.0

219
retropikzel/fcgi.scm Normal file
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@ -0,0 +1,219 @@
(define FCGI-BEGIN-REQUEST 1)
(define FCGI-ABORT-REQUEST 2)
(define FCGI-END-REQUEST 7)
(define FCGI-PARAMS 4)
(define FCGI-STDIN 5)
(define FCGI-STDOUT 6)
(define FCGI-STDERR 7)
(define FCGI-DATA 8)
(define FCGI-GET-VALUES 9)
(define FCGI-GET-VALUES-RESULT 10)
(define FCGI-UNKNOWN-TYPE 11)
(define (fcgi-type->symbol type)
(cond ((= type FCGI-BEGIN-REQUEST) 'FCGI-BEGIN-REQUEST)
((= type FCGI-ABORT-REQUEST) 'FCGI-ABORT-REQUEST)
((= type FCGI-END-REQUEST) 'FCGI-END-REQUEST)
((= type FCGI-PARAMS) 'FCGI-PARAMS)
((= type FCGI-STDIN) 'FCGI-STDIN)
((= type FCGI-STDOUT) 'FCGI-STDOUT)
((= type FCGI-STDERR) 'FCGI-STDERR)
((= type FCGI-DATA) 'FCGI-DATA)
((= type FCGI-GET-VALUES) 'FCGI-GET-VALUES)
((= type FCGI-GET-VALUES-RESULT) 'FCGI-GET-VALUES-RESULT)
((= type FCGI-UNKNOWN-TYPE) 'FCGI-UNKNOWN-TYPE)))
(define FCGI-KEEP-CONN 1)
(define FCGI-RESPONDER 1)
(define FCGI-AUTHORIZER 2)
(define FCGI-FILTER 3)
(define (fcgi-role->symbol role)
(cond ((= role FCGI-RESPONDER) 'FCGI-RESPONDER)
((= role FCGI-AUTHORIZER) 'FCGI-AUTHORIZER)
((= role FCGI-FILTER) 'FCGI-FILTER)))
(define (b1+b0 b1 b0)
;; https://web.archive.org/web/20160119141816/http://www.fastcgi.com/drupal/node/6?q=node%2F22
;; FROM SPECIFICATION:
;; When two adjacent structure components are named identically except for
;; the suffixes "B1" and "B0," it means that the two components may be viewed
;; as a single number, computed as B1<<8 + B0
;; BUT IN CODE THEY DO: (B1<<8) + B0
(+ (arithmetic-shift b1 8) b0))
(define (integer->b1-b0 int)
(let ((b1 (bitwise-and (arithmetic-shift int -8) 255))
(b0 (bitwise-and int 255)))
`((b1 . ,b1) (b0 . ,b0))))
(define (parse-request-content type content)
(cond
((symbol=? type 'FCGI-BEGIN-REQUEST)
(let ((role-b1 (bytevector-u8-ref content 0))
(role-b0 (bytevector-u8-ref content 1))
(flags (bytevector-u8-ref content 2)))
`((role . ,(b1+b0 role-b1 role-b0))
(flags . ,flags))))
((symbol=? type 'FCGI-PARAMS)
;; https://web.archive.org/web/20160119141816/http://www.fastcgi.com/drupal/node/6?q=node%2F22
;; 3.4 Name-Value Pairs
(letrec*
((>>7 (lambda (n) (exact (floor (* n (expt 2 -7))))))
(read-length
(lambda (bv start-index)
(let*
((b0 (bytevector-u8-ref bv (+ start-index 0)))
(b0>>7 (>>7 b0))
(b3 (if (= b0>>7 0) 0 b0))
(b2 (if (= b0>>7 0) 0 (bytevector-u8-ref bv (+ start-index 1))))
(b1 (if (= b0>>7 0) 0 (bytevector-u8-ref bv (+ start-index 2))))
;; Notice redefinition of b0
(b0 (if (= b0>>7 0) b0 (bytevector-u8-ref bv (+ start-index 3))))
(bytes-in-length (if (= b0>>7 0) 1 4)))
(cons bytes-in-length
(if (= b0>>7 0)
b0
;; ((B3 & 0x7f) << 24) + (B2 << 16) + (B1 << 8) + B0
(+ (arithmetic-shift (bitwise-and b3 127) 24)
(arithmetic-shift b2 16)
(arithmetic-shift b1 8)
b0))))))
(content-length (bytevector-length content))
(looper
(lambda (start-index result)
(if (>= start-index content-length)
result
(let*
((name-length (read-length content start-index))
(value-length
(read-length content (+ start-index (car name-length))))
(lengths-length (+ (car name-length) (car value-length)))
(name (string->symbol
(utf8->string
(bytevector-copy content
(+ start-index lengths-length)
(+ start-index
lengths-length
(cdr name-length))))))
(value (utf8->string
(bytevector-copy content
(+ start-index
lengths-length
(cdr name-length))
(+ start-index
lengths-length
(cdr name-length)
(cdr value-length))))))
(looper (+ start-index
lengths-length
(cdr name-length)
(cdr value-length))
(append result (list (cons name value)))))))))
(if (= content-length 0)
(bytevector)
(looper 0 '()))))
((symbol=? type 'FCGI-STDIN)
(utf8->string content))
(else content)))
(define (read-request socket)
(let* ((fields (socket-recv socket 8))
(version (bytevector-u8-ref fields 0))
(type (bytevector-u8-ref fields 1))
(type-symbol (fcgi-type->symbol type))
(request-id-b1 (bytevector-u8-ref fields 2))
(request-id-b0 (bytevector-u8-ref fields 3))
(request-id (b1+b0 request-id-b1 request-id-b0))
(content-length-b1 (bytevector-u8-ref fields 4))
(content-length-b0 (bytevector-u8-ref fields 5))
(content-length (b1+b0 content-length-b1 content-length-b0))
(padding-length (bytevector-u8-ref fields 6))
(reserved (bytevector-u8-ref fields 7))
(content-data (if (> content-length 0)
(socket-recv socket content-length)
(bytevector)))
(padding-data (if (> padding-length 0)
(socket-recv socket padding-length)
(bytevector))))
(when (not (= version 1)) (error "Unsupported fastcgi version" version))
`(,type-symbol
(id . ,request-id)
(content . ,(parse-request-content type-symbol content-data)))))
(define (read-requests socket result)
(let ((request (read-request socket)))
(if (symbol=? (car request) 'FCGI-STDIN)
(reverse (cons request result))
(read-requests socket (cons request result)))))
(define (write-response socket type id response-bytes)
(let* ((version 1)
(header-bytes
(let* ((bytes (make-bytevector 8 0))
(id-b1-b0 (integer->b1-b0 id))
(content-length (bytevector-length response-bytes))
(content-length-b1-b0 (integer->b1-b0 content-length))
(padding-length 0)
(reserved 0))
(bytevector-u8-set! bytes 0 version)
(bytevector-u8-set! bytes 1 type)
(bytevector-u8-set! bytes 2 (cdr (assoc 'b1 id-b1-b0)))
(bytevector-u8-set! bytes 3 (cdr (assoc 'b0 id-b1-b0)))
(bytevector-u8-set! bytes 4 (cdr (assoc 'b1 content-length-b1-b0)))
(bytevector-u8-set! bytes 5 (cdr (assoc 'b0 content-length-b1-b0)))
(bytevector-u8-set! bytes 6 padding-length)
(bytevector-u8-set! bytes 7 reserved)
bytes))
(response (bytevector-append header-bytes response-bytes)))
(socket-send socket response)))
(define (check-role role)
(if (= role FCGI-RESPONDER)
role
(error "Unsupported fastcgi role" (fcgi-role->symbol role))))
(define fcgi-internal-handle
(lambda (client-socket thunk)
(let*
((requests (read-requests client-socket '()))
(begin-request (cdr (assoc 'FCGI-BEGIN-REQUEST requests)))
(begin-request-content (cdr (assoc 'content begin-request)))
(id (cdr (assoc 'id begin-request)))
(role (check-role (cdr (assoc 'role begin-request-content))))
(flags (cdr (assoc 'flags begin-request-content)))
(params-request (cdr (assoc 'FCGI-PARAMS requests)))
(headers (cdr (assoc 'content params-request)))
(content-length (string->number (cdr (assoc 'CONTENT_LENGTH headers))))
(query-string (cdr (assoc 'QUERY_STRING headers)))
(parameters '()) ;; TODO
(stdin-request (cdr (assoc 'FCGI-STDIN requests)))
(body (cdr (assoc 'content stdin-request)))
(files '()) ;; TODO
(request '())
(response (parameterize
((current-output-port (open-output-string)))
(apply thunk
(list request
headers
parameters
'() ;; TODO Cookies
body
files))
(get-output-string (current-output-port)))))
(write-response client-socket FCGI-STDOUT id (string->utf8 response))
(write-response client-socket FCGI-STDERR id (make-bytevector 0))
(write-response client-socket FCGI-END-REQUEST id (make-bytevector 0))
(socket-close client-socket))))
(define fcgi-listen
(lambda (socket thunk)
(fcgi-internal-handle (socket-accept socket) thunk)
(fcgi-listen socket thunk)))
(define (handle-request options thunk)
(let ((port (assoc 'port options)))
(when (not port)
(error "handle-request (fcgi) requires port to be passed in options, example: '((port . \"3000\"))"))
(fcgi-listen (make-server-socket (cdr port) *af-inet* *sock-stream* *ipproto-ip*) thunk)))

12
retropikzel/fcgi.sld Normal file
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@ -0,0 +1,12 @@
(define-library
(retropikzel fcgi)
(import (scheme base)
(scheme write)
(scheme char)
(scheme file)
(scheme complex)
(scheme process-context)
(srfi 60)
(srfi 106))
(export handle-request)
(include "fcgi.scm"))

165
retropikzel/fcgi/LICENSE Normal file
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@ -0,0 +1,165 @@
GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.
0. Additional Definitions.
As used herein, "this License" refers to version 3 of the GNU Lesser
General Public License, and the "GNU GPL" refers to version 3 of the GNU
General Public License.
"The Library" refers to a covered work governed by this License,
other than an Application or a Combined Work as defined below.
An "Application" is any work that makes use of an interface provided
by the Library, but which is not otherwise based on the Library.
Defining a subclass of a class defined by the Library is deemed a mode
of using an interface provided by the Library.
A "Combined Work" is a work produced by combining or linking an
Application with the Library. The particular version of the Library
with which the Combined Work was made is also called the "Linked
Version".
The "Minimal Corresponding Source" for a Combined Work means the
Corresponding Source for the Combined Work, excluding any source code
for portions of the Combined Work that, considered in isolation, are
based on the Application, and not on the Linked Version.
The "Corresponding Application Code" for a Combined Work means the
object code and/or source code for the Application, including any data
and utility programs needed for reproducing the Combined Work from the
Application, but excluding the System Libraries of the Combined Work.
1. Exception to Section 3 of the GNU GPL.
You may convey a covered work under sections 3 and 4 of this License
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43
retropikzel/fcgi/README.md Normal file
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@ -0,0 +1,43 @@
Scheme library implementing [FastCGI](https://en.wikipedia.org/wiki/FastCGI)
## Simple example
### Scheme Server
(import (scheme base)
(scheme write)
(retropikzel scgi))
(handle-request
'((port . "3001"))
(lambda (request)
(display "Content-type: text/html")
(display "\r\n")
(display "\r\n")
(display "Hello world")))
### HTTP Server
Using lighttpd might be the simplest to get started, install it and then
put this into file called lighttpd.conf in your project folder.
server.document-root = "/your-project-path"
server.errorlog = "/tmp/scgi-error.log"
server.modules = ("mod_scgi")
server.port = 3000
scgi.debug = 1
scgi.server = ("/" =>
(( "host" => "127.0.0.1",
"port" => 3001,
"check-local" => "disable")))
mimetype.assign = (
".html" => "text/html",
".txt" => "text/plain",
".jpg" => "image/jpeg",
".png" => "image/png")
Run ligghtpd:
lighttpd -D -f lighttpd.conf
Then run your SCGI porgram and open your browser to http://127.0.0.1:3000/

1
retropikzel/fcgi/VERSION Normal file
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@ -0,0 +1 @@
1.0.0

95
retropikzel/net.scm Normal file
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@ -0,0 +1,95 @@
(define temporary-directory
(if (get-environment-variable "NET_TMP_PATH")
(get-environment-variable "NET_TMP_PATH")
"/tmp"))
(define encode-replacements
(list (list " " "%20")
(list " " "+")
(list "!" "%21")
(list "#" "%23")
(list "$" "%24")
(list "%" "%25")
(list "&" "%26")
(list "'" "%27")
(list "(" "%28")
(list ")" "%29")
(list "*" "%2A")
(list "+" "%2B")
(list "," "%2C")
(list "/" "%2F")
(list ":" "%3A")
(list ";" "%3B")
(list "=" "%3D")
(list "?" "%3F")
(list "@" "%40")
(list "[" "%5B")
(list "]" "%5D")
(list "<" "%3C")
(list ">" "%3E")
(list "\\" "%5C")
(list "\"" "%22")
(list "\n" "%0A")
(list "\r" "%0D")))
(define decode-replacements (map reverse encode-replacements))
(define get-replacement
(lambda (key mode)
(let ((r (if (string=? mode "encode")
(assoc key encode-replacements)
(assoc key decode-replacements))))
(if r (car (cdr r)) key))))
(define endecode
(lambda (mode s)
(if (not s)
""
(letrec ((s-length (string-length s))
(looper
(lambda (i result)
(if (< i s-length)
(let ((key-length (if (and (string=? mode "decode")
(string=? (string-copy s i (+ i 1)) "%")
(> s-length (+ i 2)))
3
1)))
(looper (+ i key-length)
(string-append result
(get-replacement
(string-copy s i (+ i key-length))
mode))))
result))))
(looper 0 "")))))
(define url-encode
(lambda (str)
(cond ((string? str) (endecode "encode" str))
(else str))))
(define url-decode
(lambda (str)
(cond ((string? str) (endecode "decode" str))
(else str))))
(define make-temp-filename
(lambda (filename)
(letrec* ((dev-random (open-binary-input-file "/dev/random"))
(min-byte (char->integer #\a))
(max-byte (char->integer #\z))
(max-length 10)
(looper (lambda (result count)
(if (>= count max-length)
result
(let ((byte (read-u8 dev-random)))
(if (and (> byte min-byte) (< byte max-byte))
(looper (bytevector-append result
(bytevector byte))
(+ count 1))
(looper result count))))))
(result (string-append (utf8->string (looper (bytevector) 0))
"_"
(utf8->string (looper (bytevector) 0))
"_"
filename)))
(close-port dev-random)
result)))

9
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(define-library
(retropikzel net)
(import (scheme base)
(scheme file)
(scheme process-context))
(export url-encode
url-decode
make-temp-filename)
(include "net.scm"))

165
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@ -0,0 +1,165 @@
GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.
0. Additional Definitions.
As used herein, "this License" refers to version 3 of the GNU Lesser
General Public License, and the "GNU GPL" refers to version 3 of the GNU
General Public License.
"The Library" refers to a covered work governed by this License,
other than an Application or a Combined Work as defined below.
An "Application" is any work that makes use of an interface provided
by the Library, but which is not otherwise based on the Library.
Defining a subclass of a class defined by the Library is deemed a mode
of using an interface provided by the Library.
A "Combined Work" is a work produced by combining or linking an
Application with the Library. The particular version of the Library
with which the Combined Work was made is also called the "Linked
Version".
The "Minimal Corresponding Source" for a Combined Work means the
Corresponding Source for the Combined Work, excluding any source code
for portions of the Combined Work that, considered in isolation, are
based on the Application, and not on the Linked Version.
The "Corresponding Application Code" for a Combined Work means the
object code and/or source code for the Application, including any data
and utility programs needed for reproducing the Combined Work from the
Application, but excluding the System Libraries of the Combined Work.
1. Exception to Section 3 of the GNU GPL.
You may convey a covered work under sections 3 and 4 of this License
without being bound by section 3 of the GNU GPL.
2. Conveying Modified Versions.
If you modify a copy of the Library, and, in your modifications, a
facility refers to a function or data to be supplied by an Application
that uses the facility (other than as an argument passed when the
facility is invoked), then you may convey a copy of the modified
version:
a) under this License, provided that you make a good faith effort to
ensure that, in the event an Application does not supply the
function or data, the facility still operates, and performs
whatever part of its purpose remains meaningful, or
b) under the GNU GPL, with none of the additional permissions of
this License applicable to that copy.
3. Object Code Incorporating Material from Library Header Files.
The object code form of an Application may incorporate material from
a header file that is part of the Library. You may convey such object
code under terms of your choice, provided that, if the incorporated
material is not limited to numerical parameters, data structure
layouts and accessors, or small macros, inline functions and templates
(ten or fewer lines in length), you do both of the following:
a) Give prominent notice with each copy of the object code that the
Library is used in it and that the Library and its use are
covered by this License.
b) Accompany the object code with a copy of the GNU GPL and this license
document.
4. Combined Works.
You may convey a Combined Work under terms of your choice that,
taken together, effectively do not restrict modification of the
portions of the Library contained in the Combined Work and reverse
engineering for debugging such modifications, if you also do each of
the following:
a) Give prominent notice with each copy of the Combined Work that
the Library is used in it and that the Library and its use are
covered by this License.
b) Accompany the Combined Work with a copy of the GNU GPL and this license
document.
c) For a Combined Work that displays copyright notices during
execution, include the copyright notice for the Library among
these notices, as well as a reference directing the user to the
copies of the GNU GPL and this license document.
d) Do one of the following:
0) Convey the Minimal Corresponding Source under the terms of this
License, and the Corresponding Application Code in a form
suitable for, and under terms that permit, the user to
recombine or relink the Application with a modified version of
the Linked Version to produce a modified Combined Work, in the
manner specified by section 6 of the GNU GPL for conveying
Corresponding Source.
1) Use a suitable shared library mechanism for linking with the
Library. A suitable mechanism is one that (a) uses at run time
a copy of the Library already present on the user's computer
system, and (b) will operate properly with a modified version
of the Library that is interface-compatible with the Linked
Version.
e) Provide Installation Information, but only if you would otherwise
be required to provide such information under section 6 of the
GNU GPL, and only to the extent that such information is
necessary to install and execute a modified version of the
Combined Work produced by recombining or relinking the
Application with a modified version of the Linked Version. (If
you use option 4d0, the Installation Information must accompany
the Minimal Corresponding Source and Corresponding Application
Code. If you use option 4d1, you must provide the Installation
Information in the manner specified by section 6 of the GNU GPL
for conveying Corresponding Source.)
5. Combined Libraries.
You may place library facilities that are a work based on the
Library side by side in a single library together with other library
facilities that are not Applications and are not covered by this
License, and convey such a combined library under terms of your
choice, if you do both of the following:
a) Accompany the combined library with a copy of the same work based
on the Library, uncombined with any other library facilities,
conveyed under the terms of this License.
b) Give prominent notice with the combined library that part of it
is a work based on the Library, and explaining where to find the
accompanying uncombined form of the same work.
6. Revised Versions of the GNU Lesser General Public License.
The Free Software Foundation may publish revised and/or new versions
of the GNU Lesser General Public License from time to time. Such new
versions will be similar in spirit to the present version, but may
differ in detail to address new problems or concerns.
Each version is given a distinguishing version number. If the
Library as you received it specifies that a certain numbered version
of the GNU Lesser General Public License "or any later version"
applies to it, you have the option of following the terms and
conditions either of that published version or of any later version
published by the Free Software Foundation. If the Library as you
received it does not specify a version number of the GNU Lesser
General Public License, you may choose any version of the GNU Lesser
General Public License ever published by the Free Software Foundation.
If the Library as you received it specifies that a proxy can decide
whether future versions of the GNU Lesser General Public License shall
apply, that proxy's public statement of acceptance of any version is
permanent authorization for you to choose that version for the
Library.

1
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Utilities related to networking libraries

1
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@ -0,0 +1 @@
1.0.0

277
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(define buffer-size 4000)
(define get-replacement
(lambda (key mode)
(let ((r (if (string=? mode "encode")
(assoc key encode-replacements)
(assoc key decode-replacements))))
(if r (car (cdr r)) key))))
(define scgi-split-by-zero->list
(lambda (source)
(let ((result (list))
(source-size (bytevector-length source)))
(letrec ((looper
(lambda (index last-index key value)
(if (< index source-size)
(if (and key value)
(begin
(if (> (bytevector-length key) 0)
(set! result
(append
result
(list (cons (utf8->string key)
(if (= (bytevector-length value) 0)
""
(utf8->string value)))))))
(looper index last-index #f #f))
(if (= (bytevector-u8-ref source index) 0)
(let ((slice (bytevector-copy source last-index index)))
(if (not key)
(looper (+ index 1) (+ index 1) slice value)
(looper (+ index 1) (+ index 1) key slice)))
(looper (+ index 1) last-index key value)))))))
(looper 0 0 #f #f))
result)))
#;(define scgi-netstring->list
(lambda (netstring)
(let ((request (list)))
(letrec ((get-request
(lambda (index)
(if (= (bytevector-u8-ref netstring index) 58)
(bytevector-copy netstring (+ index 1))
(get-request (+ index 1))))))
(if (> (bytevector-length netstring) 0)
(scgi-split-by-zero->list (get-request 0))
(list))))))
#;(define scgi-get-request-body
(lambda (request-bytes content-length)
(letrec ((looper
(lambda (index)
(if (and (> (bytevector-length request-bytes) 0)
(= (bytevector-u8-ref request-bytes index) 0)
(= (bytevector-u8-ref request-bytes (+ index 1)) 44))
(bytevector-copy request-bytes (+ index 2))
(looper (- index 1))))))
(looper (- (bytevector-length request-bytes) 1)))))
#;(define read-all-from-socket
(lambda (socket result)
(let ((bytes (socket-recv socket buffer-size)))
(if (or (eof-object? bytes)
(< (bytevector-length bytes) buffer-size))
(bytevector-append result bytes)
(read-all-from-socket socket (bytevector-append result bytes))))))
(define (read-size-from-socket result socket)
(let ((bytes (socket-recv socket 1)))
(if (char=? (integer->char (bytevector-u8-ref bytes 0)) #\:)
(string->number (utf8->string result))
(read-size-from-socket (bytevector-append result bytes) socket))))
(define (read-headers-from-socket socket)
(socket-recv socket (read-size-from-socket (bytevector) socket)))
(define (read-body-from-socket socket content-size)
(socket-recv socket 1) ; Read away ","
(socket-recv socket content-size))
(define (clean-files)
(for-each
(lambda (file)
(let ((path (cdr file)))
(when (file-exists? path)
(delete-file path))))
files))
(define request (list))
(define files (list))
(define string-split
(lambda (str mark)
(let* ((str-l (string->list str))
(res (list))
(last-index 0)
(index 0)
(splitter (lambda (c)
(cond ((char=? c mark)
(begin
(set! res (append res (list (string-copy str last-index index))))
(set! last-index (+ index 1))))
((equal? (length str-l) (+ index 1))
(set! res (append res (list (string-copy str last-index (+ index 1)))))))
(set! index (+ index 1)))))
(for-each splitter str-l)
res)))
(define split-http-parameters
(lambda (body)
(cond ((or (not (string? body))
(string=? "" body))
(list))
(else (let ((bodylist (string->list body)))
(map (lambda (p)
(cons (list-ref p 0)
(if (> (length p) 1)
(list-ref p 1)
"")))
(map (lambda (x) (string-split x #\=))
(string-split (list->string bodylist)
#\&))))))))
(define string-filter
(lambda (str filter)
(let ((result (list)))
(string-for-each
(lambda (c)
(if (filter c)
(set! result (append result (list c)))))
str)
(list->string result))))
(define read-binary-port-until
(lambda (port result until)
(let ((byte (read-u8 port)))
(if (or (eof-object? byte)
(= byte until))
result
(read-binary-port-until port (bytevector-append result
(bytevector byte))
until)))))
(define read-bytevector-line
(lambda (port)
(let* ((result (utf8->string (read-binary-port-until port
(bytevector)
(char->integer #\newline))))
(result-length (string-length result))
(ends-in-return? (and (> result-length 0)
(char=? (string-ref result (- result-length 1))
#\return))))
(cond ((= result-length 0) "")
(ends-in-return? (string-copy result 0 (- result-length 1)))
(else result)))))
(define breaker (char->integer #\-))
(define scgi-internal-handle
(lambda (client-socket thunk)
(let* ((headers (scgi-split-by-zero->list (read-headers-from-socket client-socket)))
(request-method (if (not (null? headers)) (cdr (assoc "REQUEST_METHOD" headers)) ""))
(content-length (if (not (null? headers)) (string->number (cdr (assoc "CONTENT_LENGTH" headers))) 0))
(content-type-pair (if (assoc "CONTENT_TYPE" headers)
(assoc "CONTENT_TYPE" headers)
(cons "Content-Type" "text/html")))
(parameters (list))
(content-type-data (string-split (cdr content-type-pair) #\;))
(content-type (list-ref content-type-data 0))
(body (if (> content-length 0)
(if (string=? content-type "multipart/form-data")
(bytevector)
(read-body-from-socket client-socket content-length))
(bytevector))))
(cond ((and content-type-pair (string=? content-type "multipart/form-data"))
(letrec* ((boundary (string->utf8 (string-append (list-ref (string-split
(list-ref content-type-data 1) #\=) 1))))
(boundary-length (bytevector-length boundary))
(content (read-body-from-socket client-socket content-length))
(content-mark 0)
(looper (lambda (index)
(cond ((< index (- content-length 4))
(if (and (= breaker (bytevector-u8-ref content index))
(= breaker (bytevector-u8-ref content (+ index 1)))
(equal? boundary (bytevector-copy content (+ index 2) (+ index 2 boundary-length))))
(let* ((part (bytevector-copy content content-mark index))
(part-length (bytevector-length part))
(part-port (open-input-bytevector part))
(part-headers-length 0)
(part-headers (letrec ((loop (lambda (line result)
(if (or (eof-object? line) (string=? line ""))
(map (lambda (p) (string-split p #\:)) result)
(begin
(set! part-headers-length (+ part-headers-length
(string-length line)
2))
(loop (read-bytevector-line part-port)
(append result (list line))))))))
(loop (read-bytevector-line part-port) (list)))))
(if (and (not (null? part-headers))
(assoc "Content-Disposition" part-headers))
(let* ((content-disposition
(map
(lambda (str)
(let ((split (string-split str #\=)))
(cons (string-filter (list-ref split 0) (lambda (c) (not (char=? c #\space))))
(if (= (length split) 2)
(string-filter (list-ref split 1) (lambda (c) (not (char=? c #\"))))
""))))
(string-split (car (cdr (assoc "Content-Disposition" part-headers))) #\;)))
(filename (assoc "filename" content-disposition)))
(if (not filename)
(set! parameters
(append parameters
(list
(cons (cdr (assoc "name" content-disposition))
(utf8->string (bytevector-copy content
(+ (+ content-mark part-headers-length) 2)
(- index 2)))))))
(let* ((tmp-file-path (make-temp-filename (cdr filename)))
(tmp-file-port (begin (when (file-exists? tmp-file-path)
(delete-file tmp-file-path))
(open-binary-output-file tmp-file-path))))
(write-bytevector (bytevector-copy content
(+ (+ content-mark part-headers-length) 2)
(- index 2))
tmp-file-port)
(close-port tmp-file-port)
(set! files (append files (list
(cons (cdr (assoc "name" content-disposition))
tmp-file-path))))))
(set! content-mark index)))
(looper (+ index boundary-length)))
(looper (+ index 1))))))))
(looper 0)))
((string=? request-method "POST")
(set! parameters (split-http-parameters (url-decode (utf8->string body)))))
(else (if (not (null? headers))
(split-http-parameters (cdr (assoc "QUERY_STRING" headers)))
(list))))
(set! request (list (cons 'headers headers)
(cons 'parameters parameters)
(cons 'files files)
(cons 'body (url-decode (utf8->string body)))))
(with-exception-handler
(lambda (ex)
(socket-send client-socket (string->utf8 "#f")))
(lambda ()
(let ((response (parameterize
((current-output-port (open-output-string)))
(apply thunk
(list request
headers
parameters
'() ;; TODO Cookies
(url-decode (utf8->string body))
files))
(set! request (list))
(set! files (list))
(get-output-string (current-output-port)))))
(socket-send client-socket
(string->utf8 (if (string? response)
response
""))))))
(socket-close client-socket))))
(define scgi-listen
(lambda (socket thunk)
(scgi-internal-handle (socket-accept socket) thunk)
(clean-files)
(scgi-listen socket thunk)))
(define (handle-request options thunk)
(let ((port (assoc 'port options)))
(when (not port)
(error "handle-request (scgi) requires port to be passed in options, example: '((port . \"3000\"))"))
(scgi-listen (make-server-socket (cdr port) *af-inet* *sock-stream* *ipproto-ip*) thunk)))

11
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(define-library
(retropikzel scgi)
(import (scheme base)
(scheme write)
(scheme char)
(scheme file)
(scheme process-context)
(srfi 106)
(retropikzel net))
(export handle-request)
(include "scgi.scm"))

165
retropikzel/scgi/LICENSE Normal file
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@ -0,0 +1,165 @@
GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
This version of the GNU Lesser General Public License incorporates
the terms and conditions of version 3 of the GNU General Public
License, supplemented by the additional permissions listed below.
0. Additional Definitions.
As used herein, "this License" refers to version 3 of the GNU Lesser
General Public License, and the "GNU GPL" refers to version 3 of the GNU
General Public License.
"The Library" refers to a covered work governed by this License,
other than an Application or a Combined Work as defined below.
An "Application" is any work that makes use of an interface provided
by the Library, but which is not otherwise based on the Library.
Defining a subclass of a class defined by the Library is deemed a mode
of using an interface provided by the Library.
A "Combined Work" is a work produced by combining or linking an
Application with the Library. The particular version of the Library
with which the Combined Work was made is also called the "Linked
Version".
The "Minimal Corresponding Source" for a Combined Work means the
Corresponding Source for the Combined Work, excluding any source code
for portions of the Combined Work that, considered in isolation, are
based on the Application, and not on the Linked Version.
The "Corresponding Application Code" for a Combined Work means the
object code and/or source code for the Application, including any data
and utility programs needed for reproducing the Combined Work from the
Application, but excluding the System Libraries of the Combined Work.
1. Exception to Section 3 of the GNU GPL.
You may convey a covered work under sections 3 and 4 of this License
without being bound by section 3 of the GNU GPL.
2. Conveying Modified Versions.
If you modify a copy of the Library, and, in your modifications, a
facility refers to a function or data to be supplied by an Application
that uses the facility (other than as an argument passed when the
facility is invoked), then you may convey a copy of the modified
version:
a) under this License, provided that you make a good faith effort to
ensure that, in the event an Application does not supply the
function or data, the facility still operates, and performs
whatever part of its purpose remains meaningful, or
b) under the GNU GPL, with none of the additional permissions of
this License applicable to that copy.
3. Object Code Incorporating Material from Library Header Files.
The object code form of an Application may incorporate material from
a header file that is part of the Library. You may convey such object
code under terms of your choice, provided that, if the incorporated
material is not limited to numerical parameters, data structure
layouts and accessors, or small macros, inline functions and templates
(ten or fewer lines in length), you do both of the following:
a) Give prominent notice with each copy of the object code that the
Library is used in it and that the Library and its use are
covered by this License.
b) Accompany the object code with a copy of the GNU GPL and this license
document.
4. Combined Works.
You may convey a Combined Work under terms of your choice that,
taken together, effectively do not restrict modification of the
portions of the Library contained in the Combined Work and reverse
engineering for debugging such modifications, if you also do each of
the following:
a) Give prominent notice with each copy of the Combined Work that
the Library is used in it and that the Library and its use are
covered by this License.
b) Accompany the Combined Work with a copy of the GNU GPL and this license
document.
c) For a Combined Work that displays copyright notices during
execution, include the copyright notice for the Library among
these notices, as well as a reference directing the user to the
copies of the GNU GPL and this license document.
d) Do one of the following:
0) Convey the Minimal Corresponding Source under the terms of this
License, and the Corresponding Application Code in a form
suitable for, and under terms that permit, the user to
recombine or relink the Application with a modified version of
the Linked Version to produce a modified Combined Work, in the
manner specified by section 6 of the GNU GPL for conveying
Corresponding Source.
1) Use a suitable shared library mechanism for linking with the
Library. A suitable mechanism is one that (a) uses at run time
a copy of the Library already present on the user's computer
system, and (b) will operate properly with a modified version
of the Library that is interface-compatible with the Linked
Version.
e) Provide Installation Information, but only if you would otherwise
be required to provide such information under section 6 of the
GNU GPL, and only to the extent that such information is
necessary to install and execute a modified version of the
Combined Work produced by recombining or relinking the
Application with a modified version of the Linked Version. (If
you use option 4d0, the Installation Information must accompany
the Minimal Corresponding Source and Corresponding Application
Code. If you use option 4d1, you must provide the Installation
Information in the manner specified by section 6 of the GNU GPL
for conveying Corresponding Source.)
5. Combined Libraries.
You may place library facilities that are a work based on the
Library side by side in a single library together with other library
facilities that are not Applications and are not covered by this
License, and convey such a combined library under terms of your
choice, if you do both of the following:
a) Accompany the combined library with a copy of the same work based
on the Library, uncombined with any other library facilities,
conveyed under the terms of this License.
b) Give prominent notice with the combined library that part of it
is a work based on the Library, and explaining where to find the
accompanying uncombined form of the same work.
6. Revised Versions of the GNU Lesser General Public License.
The Free Software Foundation may publish revised and/or new versions
of the GNU Lesser General Public License from time to time. Such new
versions will be similar in spirit to the present version, but may
differ in detail to address new problems or concerns.
Each version is given a distinguishing version number. If the
Library as you received it specifies that a certain numbered version
of the GNU Lesser General Public License "or any later version"
applies to it, you have the option of following the terms and
conditions either of that published version or of any later version
published by the Free Software Foundation. If the Library as you
received it does not specify a version number of the GNU Lesser
General Public License, you may choose any version of the GNU Lesser
General Public License ever published by the Free Software Foundation.
If the Library as you received it specifies that a proxy can decide
whether future versions of the GNU Lesser General Public License shall
apply, that proxy's public statement of acceptance of any version is
permanent authorization for you to choose that version for the
Library.

43
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Scheme library implementing [Simple Common Gateway Interface](https://python.ca/scgi/protocol.txt)
## Simple example
### Scheme Server
(import (scheme base)
(scheme write)
(retropikzel scgi))
(handle-request
'((port . "3001"))
(lambda (request)
(display "Content-type: text/html")
(display "\r\n")
(display "\r\n")
(display "Hello world")))
### HTTP Server
Using lighttpd might be the simplest to get started, install it and then
put this into file called lighttpd.conf in your project folder.
server.document-root = "/your-project-path"
server.errorlog = "/tmp/scgi-error.log"
server.modules = ("mod_scgi")
server.port = 3000
scgi.debug = 1
scgi.server = ("/" =>
(( "host" => "127.0.0.1",
"port" => 3001,
"check-local" => "disable")))
mimetype.assign = (
".html" => "text/html",
".txt" => "text/plain",
".jpg" => "image/jpeg",
".png" => "image/png")
Run ligghtpd:
lighttpd -D -f lighttpd.conf
Then run your SCGI porgram and open your browser to http://127.0.0.1:3000/

1
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1.0.0