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 1.9 2003/08/10 17:56:44 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) headers)
  23                         &body body)
  24   (let ((fmt (gensym "FMT-"))
  25         (precomp (gensym "PRE-"))
  26         (result (gensym "RES-"))
  27         (outstr (gensym "STR-"))
  28         (stream (gensym "STRM-"))
  29         (hdr (gensym "HDR-")))
  30     `(let ((,fmt ,format)
  31            (,precomp ,precompute)
  32            ,result ,outstr ,stream)
  33        (declare (ignorable ,stream))
  34        (write-header-line "Status" "200 OK")
  35        (write-header-line "Content-Type" (format-string ,fmt))
  36        (dolist (,hdr ,headers)
  37          (write-header-line (car ,hdr) (cdr ,hdr)))
  38        (unless ,precomp
  39          (write-string "end" *modlisp-socket*)
  40          (write-char #\NewLine *modlisp-socket*))
  41        (setq ,outstr
  42          (with-output-to-string (,stream)
  43            (let ((*modlisp-socket* (if ,precomp
  44                                       ,stream
  45                                     *modlisp-socket*)))
  46              (setq ,result (progn ,@body)))))
  47        (cond
  48         (,precomp
  49          (write-header-line "Content-Length"
  50                             (write-to-string (length ,outstr)))
  51          (write-header-line "Keep-Socket" "1")
  52          (write-header-line "Connection" "Keep-Alive")
  53          (write-string "end" *modlisp-socket*)
  54          (write-char #\NewLine *modlisp-socket*)
  55          (write-string ,outstr *modlisp-socket*)
  56          (finish-output *modlisp-socket*)
  57          (setq *close-modlisp-socket* nil))
  58         (t
  59          (finish-output *modlisp-socket*)
  60          (setq *close-modlisp-socket* t)))
  61        ,result)))
  62
  63 (defun redirect-to-location (url)
  64   (write-header-line "Status" "307 Temporary Redirect")
  65   (write-header-line "Location" url)
  66   ;;(write-header-line "Keep-Socket" "1")
  67   ;;(write-header-line "Connection" "Keep-Alive")
  68   (write-string "end" *modlisp-socket*)
  69   (write-char #\NewLine *modlisp-socket*)
  70   (force-output *modlisp-socket*)
  71   (setq *close-modlisp-socket* t))
  72
  73 (defun output-ml-page (format html)
  74   (write-header-line "Status" "200 OK")
  75   (write-header-line "Content-Type" (format-string format))
  76   (write-header-line "Content-Length" (format nil "~d" (length html)))
  77   (write-header-line "Keep-Socket" "1")
  78   (write-header-line "Connection" "Keep-Alive")
  79   (write-string "end" *modlisp-socket*)
  80   (write-char #\NewLine *modlisp-socket*)
  81   (write-string html *modlisp-socket*)
  82   (force-output *modlisp-socket*)
  83   (setq *close-modlisp-socket* nil))
  84
  85 (defun output-html-page (str)
  86   (output-ml-page :html str))
  87
  88 (defun output-xml-page (str)
  89   (output-ml-page :xml str))
  90
  91 ;; Utility functions for library users
  92
  93 (defun query-to-alist (posted-string)
  94   "Converts a posted string to an assoc list of keyword names and values,
  95 \"a=1&bc=demo\" => ((:a . \"1\") (:bc . \"demo\"))"
  96   (when posted-string
  97     (let ((alist '()))
  98       (dolist (name=val (kmrcl:delimited-string-to-list posted-string #\&)
  99                (nreverse alist))
 100         (let ((name-val-list (kmrcl:delimited-string-to-list name=val #\=)))
 101           (if (= 2 (length name-val-list))
 102             (destructuring-bind (name val) name-val-list
 103               (push (cons (kmrcl:ensure-keyword name)
 104                           (kmrcl:decode-uri-query-string val))
 105                     alist))
 106             (cmsg-c :debug "Invalid number of #\= in ~S" name-val-list)))))))