utils.lisp

   1 ;;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10; Package: modlisp -*-
   2 ;;;; *************************************************************************
   3 ;;;; FILE IDENTIFICATION
   4 ;;;;
   5 ;;;; Name:          utils.lisp
   6 ;;;; Purpose:       Utility functions for modlisp package
   7 ;;;; Programmer:    Kevin M. Rosenberg
   8 ;;;; Date Started:  Dec 2002
   9 ;;;;
  10 ;;;; $Id: utils.lisp,v 1.6 2003/07/11 02:38:00 kevin Exp $
  11 ;;;; *************************************************************************
  12
  13 (in-package #:modlisp)
  14
  15 (defun format-string (fmt)
  16   (case fmt
  17     (:html "text/html")
  18     (:xml "text/xml")
  19     (:text "text/plain")
  20     (otherwise fmt)))
  21
  22 (defmacro with-ml-page ((&key (format :html) (precompute t)) &body body)
  23   (let ((fmt (gensym))
  24         (precomp (gensym))
  25         (result (gensym))
  26         (outstr (gensym))
  27         (stream (gensym)))
  28     `(let ((,fmt ,format)
  29            (,precomp ,precompute)
  30            ,result ,outstr)
  31        (write-header-line "Status" "200 OK")
  32        (write-header-line "Content-Type" (format-string ,fmt))
  33        (unless ,precomp
  34          (write-string "end" *modlisp-socket*)
  35          (write-char #\NewLine *modlisp-socket*))
  36        (setq ,outstr
  37          (with-output-to-string (,stream)
  38            (let ((*modlisp-socket* (if ,precomp
  39                                       ,stream
  40                                     *modlisp-socket*)))
  41              (setq ,result (progn ,@body)))))
  42        (cond
  43         (,precomp
  44          (write-header-line "Content-Length"
  45                             (write-to-string (length ,outstr)))
  46          (write-header-line "Keep-Socket" "1")
  47          (write-header-line "Keep-Alive" "timeout=15, max=99")
  48          (write-header-line "Connection" "Keep-Alive")
  49          (write-string "end" *modlisp-socket*)
  50          (write-char #\NewLine *modlisp-socket*)
  51          (write-string ,outstr *modlisp-socket*)
  52          (finish-output *modlisp-socket*)
  53          (setq *close-modlisp-socket* nil))
  54         (t
  55          (setq *close-modlisp-socket* t)
  56          (finish-output *modlisp-socket*)))
  57        ,result)))
  58
  59 (defun redirect-to-location (url)
  60   (write-header-line "Status" "302 Redirect")
  61   (write-header-line "Location" url)
  62   (write-char #\NewLine *modlisp-socket*)
  63   (setq *close-modlisp-socket* t))
  64
  65 (defun output-ml-page (format html)
  66   (write-header-line "Status" "200 OK")
  67   (write-header-line "Content-Type" (format-string format))
  68   (write-header-line "Content-Length" (format nil "~d" (length html)))
  69   (write-header-line "Keep-Socket" "1")
  70   (write-header-line "Keep-Alive" "timeout=15, max=99")
  71   (write-header-line "Connection" "Keep-Alive")
  72   (write-string "end" *modlisp-socket*)
  73   (write-char #\NewLine *modlisp-socket*)
  74   (write-string html *modlisp-socket*)
  75   (setq *close-modlisp-socket* nil))
  76
  77 (defun output-html-page (str)
  78   (output-ml-page :html str))
  79
  80 (defun output-xml-page (str)
  81   (output-ml-page :xml str))
  82
  83 ;; Utility functions for library users
  84
  85 (defun posted-to-alist (posted-string)
  86   "Converts a posted string to an assoc list of keyword names and values,
  87 \"a=1&bc=demo\" => ((:a . \"1\") (:bc . \"demo\"))"
  88   (when posted-string
  89     (let ((alist '()))
  90       (dolist (name=val (kmrcl:delimited-string-to-list posted-string #\&)
  91                (nreverse alist))
  92         (let ((name-val-list (kmrcl:delimited-string-to-list name=val #\=)))
  93           (if (= 2 (length name-val-list))
  94             (destructuring-bind (name val) name-val-list
  95               (push (cons (kmrcl:ensure-keyword name)
  96                           (kmrcl:decode-uri-query-string val))
  97                     alist))
  98             (cmsg-c :debug "Invalid number of #\= in ~S" name-val-list)))))))