Megatest

;; stml is a list of html strings

;; (declare (unit stml))

(module stml2
    *

  (import

    (chicken base)
    (chicken blob)
    (chicken condition)
    (chicken file)
    (chicken format)
    (chicken io)
    (chicken pathname)
    (chicken port)
    (chicken process)
    (chicken process-context posix)
    (chicken process-context)
    (chicken random)
    (chicken string)
    (chicken time posix)
    (chicken time)
    (prefix crypt c:)
    (prefix dbi dbi:)
    cookie
    queues
    regex
    scheme
    srfi-1
    srfi-13
    srfi-69
    typed-records



    )

;; The (usually global) sdat contains everything about the session
;;
(defstruct sdat
  ;; database
  (dbtype 'pg)
  (dbinit #f)

;; to obscure and indirect database ids use one time keys
;;
;;  (s:get-key 'n 1)     => "n99e1882" n=number 99e is the week number since 1970, remainder is random
;;  (s:key->val "n1882") => 1
;;
;;  first letter is a type: n=number, s=string, b=boolean
(define (s:get-key key-type val)
  (let ((mkrandstr (lambda (innum)(number->string (pseudo-random-integer innum) 16)))
	(week      (number->string (quotient (current-seconds) (* 7 24 60 60)) 16)))
    (let loop ((siz 1000)
	       (key (conc key-type week (mkrandstr 100)))
	       (num 0))
      (if (s:session-var-get key) ;; have a collision
	  (loop (cond                 ;; in the unlikey event we have trouble getting a new var, keep increasing the size of the number
		 ((< num 50)  100)

#;(define session:valid-chars "abcdefghijklmnopqrstuvwxyz0123456789") ;; cookies are case insensitive.
#;(define session:num-valid-chars (string-length session:valid-chars))

#;(define (session:get-nth-char nth)
  (substring session:valid-chars nth  (+ nth 1)))

#;(define (session:get-rand-char)
  (session:get-nth-char (pseudo-random-integer session:num-valid-chars)))

#;(define (session:make-rand-string len)
  (let loop ((res "")
             (n   1))
    (if (> n len) res
        (loop (string-append res (session:get-rand-char))
              (+ n 1)))))

;; maybe replace above make-rand-string with this someday?
;;
#;(define (session:generic-make-rand-string len seed-string)
  (let ((num-chars (string-length seed-string)))
    (let loop ((res "")
	       (n   1))
      (let ((char-num (pseudo-random-integer num-chars)))
	(if (> n len) res
	    (loop (string-append res (substring seed-string char-num (+ char-num 1)))
		  (+ n 1)))))))

;; Rely on crypt egg's default settings being secure enough, accept
;; backwards-compatible OpenSSL crypt passwords too.
;;

   ((string? val)  (string->number val))
   ((symbol? val)  (string->number (symbol->string val)))
   (else     #f)))

;; NB// this is *illegal* pgint
(define (s:illegal-pgint val)
  (cond
   ((> val 2147483640.0) 1)   ;;  2147483647
   ((< val -2147483640.0) -1) ;; -2147483648
   (else #f)))

(define (s:any->pgint val)
  (let ((n (s:any->number val)))
    (if n
	(if (s:illegal-pgint n)
	    #f

	(formdat:load-all-port (current-input-port))
	(make-formdat:formdat))))

;; (s:process-cgi-input (caaar dat))
(define (formdat:load-all-port inp)
  (let* ((formdat        (make-formdat:formdat))
	 (debugp         #f))
    ;; (open-output-file (conc "/tmp/delme-" (current-user-id) ".log"))))
    ;; (write-string (read-string #f inp) #f debugp)  ;; destroys all data!
    (formdat:initialize formdat)
    (let ((alldats (formdat:dat->list inp 10e6 debug-port: #f debugp)))
      
      #;(if debugp (format debugp "formdat : alldats: ~A\n" alldats))

      (let ((firstitem   (car alldats))
	    (multipass #f)) 
	(if (and (not (null? firstitem))
		 (not (null? (car firstitem))))
	    (if (string-match formdat:delim-patt-rex (caar firstitem))
		(set! multipass #t)))

	    ;; 		       (munged (s:process-cgi-input datstr)))
	    ;; 		  (print "datstr: " datstr " munged: " munged)
	    (if (and (not (null? alldats))
		     (not (null? (car alldats)))
		     (not (null? (caar alldats))))
		(formdat:load formdat  (s:process-cgi-input (caaar alldats))))) ;; munged))
	;;		    (format debugp "formdat : name: ~A content: ~A\n" name content)
	#;(if debugp (close-output-port debugp))
	;; (sdat-formdat-set! s:session formdat)
	formdat))))
		
#|
(define inp (open-input-file "tests/example.post.in"))
(define dat (read-string #f inp))
(define datstr (open-input-string dat))

(define session:valid-chars "abcdefghijklmnopqrstuvwxyz0123456789") ;; cookies are case insensitive.
(define session:num-valid-chars (string-length session:valid-chars))

(define (session:get-nth-char nth)
  (substring session:valid-chars nth  (+ nth 1)))

(define (session:get-rand-char)
  (session:get-nth-char (pseudo-random-integer session:num-valid-chars)))

(define (session:make-rand-string len)
  (let loop ((res "")
             (n   1))
    (if (> n len) res
        (loop (string-append res (session:get-rand-char))
              (+ n 1)))))

;; maybe replace above make-rand-string with this someday?
;;
(define (session:generic-make-rand-string len seed-string)
  (let ((num-chars (string-length seed-string)))
    (let loop ((res "")
	       (n   1))
      (let ((char-num (pseudo-random-integer num-chars)))
	(if (> n len) res
	    (loop (string-append res (substring seed-string char-num (+ char-num 1)))
		  (+ n 1)))))))


;;======================================================================
;; P A R A M S

      (if debugmode (session:log self "session:setup dbfname=" dbfname ", dbtype=" dbtype ", dbinit=" dbinit))
      (if (eq? dbtype 'sqlite3)
	  ;; The 'auto method will distribute dbs across the disk using hash
	  ;; of user host and user. TODO
	  ;; (if (eq? dbfname 'auto) ;; This is the auto assignment of a db based on hash of IP
	  (let ((dbpath (pathname-directory dbfname)))  ;; do a couple sanity checks here to make setting up easier
	    (if debugmode (session:log self "INFO: setting up for sqlite3 db access to " dbfname))
	    (if (not (file-writable? dbpath))
		(session:log self "WARNING: Cannot write to " dbpath)
		(if debugmode (session:log self "INFO: " dbpath " is writeable")))
	    (if (file-exists? dbfname)
		(begin
		  ;; (session:log self "setting dbexists to #t")
		  (set! dbexists #t))))
	  (if debugmode (session:log self "INFO: setting up for pg db access to account info " dbinit)))