+++ /dev/null
-(import (chicken io)
- (chicken port)
- (chicken file)
- (chicken string)
- (chicken pathname)
- (chicken condition)
- (chicken time posix)
- (chicken process)
- (chicken process-context)
- matchable srfi-13
- uri-common tcp6 openssl)
-
-(define-record config
- root-dir host port certfile keyfile)
-
-(define file-types
- '(("gmi" "text/gemini" "charset=utf-8")
- ("txt" "text/plain" "charset=utf-8")))
-
-(define (process-request config request-line)
- (let ((uri (uri-normalize-path-segments (absolute-uri request-line))))
- (cond
- ((not (eq? (uri-scheme uri) 'gemini))
- (fail-permanent "Unsupported scheme."))
- ((not (uri-host uri))
- (fail-permanent "URL lacks host name."))
- ((not (equal? (uri-host uri) (config-host config)))
- (fail-permanent "Proxy requests forbidden."))
- ((uri-path-relative? uri)
- (fail-permanent "Path must be absolute."))
- ((not (document-available? config uri))
- (fail-permanent "Document not found."))
- (else
- (serve-document config uri)))))
-
-(define (fail-permanent reason)
- (print "50 " reason "\r"))
-
-(define (document-available? config uri)
- (file-exists? (document-path config uri)))
-
-(define (document-path config uri)
- (let* ((crumbs (reverse (cons (config-root-dir config) (cdr (uri-path uri)))))
- (path (make-pathname (reverse (cdr crumbs)) (car crumbs))))
- (if (directory-exists? path)
- (make-pathname path "index.gmi")
- path)))
-
-(define (serve-document config uri)
- (let* ((path (document-path config uri))
- (ext (pathname-extension path))
- (mime-detected (assoc ext file-types))
- (mime (if mime-detected mime-detected (assoc "txt" file-types)))
- (mime-type (cadr mime)))
- (print "20 " (string-intersperse (cdr mime) ";") "\r")
- (cond
- ((equal? mime-type "text/gemini") (serve-dynamic-gemini path))
- ((equal? mime-type "text/plain") (serve-text-plain path))
- (else (serve-binary)))))
-
-(define (serve-text-plain path)
- (with-input-from-file path
- (lambda ()
- (let loop ((str (read-string)))
- (unless (eof-object? str)
- (print* str)
- (loop (read-string)))))))
-
-(define (serve-dynamic-gemini path)
- (with-input-from-file path
- (lambda ()
- (let loop ((c (peek-char)))
- (if (eof-object? c)
- 'done
- (begin
- (if (eq? c #\,)
- (begin
- (read-char)
- (serve-dynamic-element (read) (pathname-directory path))
- (read-line))
- (print (read-line)))
- (loop (peek-char))))))))
-
-(define (serve-dynamic-element element working-directory)
- (match element
- (('eval expression)
- (with-current-working-directory
- working-directory
- (lambda ()
- (eval expression))))
- (('shell command)
- (with-current-working-directory
- working-directory
- (lambda ()
- (let-values (((in-port out-port id) (process command)))
- (let ((string (read-string #f in-port)))
- (unless (eof-object? string)
- (print string))
- (close-input-port in-port)
- (close-output-port out-port))))))
- (else (error "Unknown element type."))))
-
-(define (with-current-working-directory directory thunk)
- (let ((old-wd (current-directory))
- (result 'none))
- (condition-case
- (begin
- (change-directory directory)
- (set! result (thunk))
- (change-directory old-wd)
- result)
- (o (exn)
- (change-directory old-wd)
- (signal o)))))
-
-
-(define (run-server config)
- (define listener (ssl-listen* hostname: (config-host config)
- port: (config-port config)
- certificate: (config-certfile config)
- private-key: (config-keyfile config)))
-
- (print "Host: '" (config-host config) "'\n"
- "Port: '" (config-port config) "'\n"
- "Root directory: '" (config-root-dir config) "'\n"
- "Cert file: '" (config-certfile config) "'\n"
- "Key file: '" (config-keyfile config) "'\n"
- "\n"
- "Gemini server listening ...")
-
- (server-loop listener config))
-
-(define (server-loop listener config)
- (let-values (((in-port out-port) (ssl-accept listener)))
- (let-values (((local-ip remote-ip) (tcp-addresses (ssl-port->tcp-port in-port))))
- (print "Accepted connection from " remote-ip
- " on " (seconds->string))
- (condition-case
- (let ((request-line (read-line in-port)))
- (print* "Serving request '" request-line "' ... ")
- (with-output-to-port out-port
- (lambda ()
- (process-request config request-line)))
- (print "done."))
- (o (exn)
- (print-error-message o))))
- (close-input-port in-port)
- (close-output-port out-port))
- (server-loop listener config))
-
-
-(define (print-usage progname)
- (print "Usage: " progname " [-h] [-p port] server-root-dir hostname certfile keyfile"))
-
-(define (main)
- (let* ((progname (pathname-file (car (argv))))
- (config (make-config #f #f 1965 #f #f)))
- (if (null? (cdr (argv)))
- (print-usage progname)
- (let loop ((args (cdr (argv))))
- (let ((this-arg (car args))
- (rest-args (cdr args)))
- (if (string-prefix? "-" this-arg)
- (cond
- ((or (equal? this-arg "-h")
- (equal? this-arg "--help"))
- (print-usage progname))
- ((or (equal? this-arg "-p")
- (equal? this-arg "--port"))
- (config-port-set! config (string->bumber (car rest-args)))
- (loop (cdr rest-args)))
- (else
- (print-usage progname)))
- (match args
- ((root-dir host certfile keyfile)
- (config-root-dir-set! config root-dir)
- (config-host-set! config host)
- (config-certfile-set! config certfile)
- (config-keyfile-set! config keyfile)
- (run-server config))
- (else
- (print "One or more invalid arguments.")
- (print-usage progname)))))))))
-
-
-(main)
The Lambda Lab / projects / rags.git / blobdiff