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(define-module (server routes)
:use-module (util)
:use-module (util options)
:use-module (util exceptions)
:use-module (srfi srfi-1)
:use-module ((ice-9 rdelim) :select (read-string))
:use-module ((ice-9 ftw) :select (scandir))
:use-module (ice-9 regex) #| regex here due to bad macros |#
:use-module ((web response) :select (build-response))
:use-module ((web uri) :select (build-relative-ref))
:use-module (sxml simple)
:use-module (sxml xpath)
:use-module (sxml namespace)
:use-module ((html util) :select (html-unattr))
:use-module (web http make-routes)
:use-module (vcomponent)
:use-module (vcomponent search)
:use-module (datetime)
:use-module (vcomponent ical output)
:autoload (vcomponent instance) (global-event-object)
:use-module (html view calendar)
:use-module ((html view search) :select (search-result-page))
)
(define (sxml->html-string sxml)
(with-output-to-string
(lambda () (display "<!doctype html>\n") (sxml->xml sxml))))
(define (// . args) (string-join args file-name-separator-string ))
(define (directory-table dir)
`(table
(thead
(tr (th "") (th "Name") (th "Perm")))
(tbody
,@(map (lambda (k)
(let* ((stat (lstat (// dir k))))
`(tr (td ,(case (stat:type stat)
[(directory) "📁"]
[(regular) "📰"]
[else "🙃"]))
(td (a (@ (href "/" ,dir "/" ,k)) ,k))
(td ,(number->string (stat:perms stat) 8)))))
(cdr (scandir dir))))))
(define get-query-page
;; A user of the website is able to fill up all of the hosts memory by
;; requesting a bunch of different search pages, and forcing a bunch
;; of pages on each. Clean up this table from time to time, possibly
;; by popularity-rank.
(let ((query-pages (make-hash-table)))
(lambda (search-term)
(aif (hash-ref query-pages search-term)
it
(let* ((q (prepare-query
(build-query-proc search-term)
(get-event-set global-event-object))))
(hash-set! query-pages search-term q)
q)))))
;; TODO ensure encoding on all fields which take user provided data.
;; Possibly a fallback which strips everything unknown, and treats
;; the bytevector as ascii.
(define-public (make-make-routes)
(make-routes
;; Manual redirect to not reserve root.
(GET "/" ()
(return '((content-type text/html))
(sxml->html-string '(a (@ (href "/today")) "Gå till idag"))))
(GET "/favicon.ico" ()
(return
`((content-type image/svg+xml))
(call-with-input-file "static/calendar.svg" read-string)))
;; TODO any exception in this causes the whole page to fail
;; It would be much better if most of the page could still make it.
(GET "/week/:start-date.html" (start-date)
(let* ((start-date
(start-of-week (parse-iso-date start-date))))
(return `((content-type application/xhtml+xml))
(with-output-to-string
(lambda ()
(sxml->xml
(html-generate calendars: (get-calendars global-event-object)
events: (get-event-set global-event-object)
start-date: start-date
end-date: (date+ start-date (date day: 6))
next-start: (lambda (d) (date+ d (date day: 7)))
prev-start: (lambda (d) (date- d (date day: 7)))
render-calendar: (@ (html view calendar week) render-calendar)
intervaltype: 'week
)))))))
(GET "/month/:start-date.html" (start-date)
(let* ((start-date (start-of-month (parse-iso-date start-date))))
(return '((content-type application/xhtml+xml))
(with-output-to-string
(lambda ()
(sxml->xml
(html-generate calendars: (get-calendars global-event-object)
events: (get-event-set global-event-object)
start-date: start-date
end-date: (date- (month+ start-date)
(date day: 1))
next-start: month+
prev-start: month-
render-calendar: (@ (html view calendar month)
render-calendar-table)
pre-start: (start-of-week start-date)
post-end: (end-of-week (end-of-month start-date))
intervaltype: 'month
)))))))
(POST "/remove" (uid)
(unless uid
(return (build-response code: 400)
"uid required"))
(aif (get-event-by-uid global-event-object uid)
(begin
;; It's hard to properly remove a file. I also want a way to undo accidental
;; deletions. Therefore I simply save the X-HNH-REMOVED flag to the file, and
;; then simple don't use those events when loading.
(remove-event global-event-object it)
(set! (prop it 'X-HNH-REMOVED) #t)
(set! (param (prop* it 'X-HNH-REMOVED) 'VALUE) "BOOLEAN")
(unless ((@ (vcomponent vdir save-delete) save-event) it)
(return (build-response code: 500)
"Saving event to disk failed."))
(return (build-response code: 204)))
(return (build-response code: 400)
(format #f "No event with UID '~a'" uid))))
;; TODO this fails when dtstart is <date>.
;; @var{cal} should be the name of the calendar encoded with
;; modified base64. See (html util).
(POST "/insert" (cal data)
(unless (and cal data)
(return (build-response code: 400)
"Both 'cal' and 'data' required\r\n"))
;; NOTE that this leaks which calendar exists,
;; but you can only query for existance.
;; also, the calendar view already show all calendars.
(let* ((calendar-name (html-unattr cal))
(calendar
(find (lambda (c) (string=? calendar-name (prop c 'NAME)))
(get-calendars global-event-object))))
(unless calendar
(return (build-response code: 400)
(format #f "No calendar with name [~a]\r\n" calendar-name)))
;; Expected form of data (but in XML) is:
;; @example
;; (*TOP*
;; (*PI* ...)
;; (icalendar (@ (xmlns "..."))
;; (vcalendar
;; (vevent ...))))
;; @end example
;; However, *PI* will probably be omited, and currently events
;; are sent without the vcalendar part. Earlier versions
;; Also omitted the icalendar part. And I'm not sure if the
;; *TOP* node is a required part of the sxml.
(let ((event
((@ (vcomponent xcal parse) sxcal->vcomponent)
(catch 'parser-error
(lambda ()
(move-to-namespace
;; TODO Multiple event components
(car ((sxpath '(// IC:vevent))
(xml->sxml data namespaces: '((IC . "urn:ietf:params:xml:ns:icalendar-2.0")))))
#f))
(lambda (err port . args)
(return (build-response code: 400)
(format #f "XML parse error ~{~a~}\r\n" args)))))))
(unless (eq? 'VEVENT (type event))
(return (build-response code: 400)
"Object not a VEVENT\r\n"))
;; NOTE add-event uses the given UID if one is given,
;; but generates its own if not. It might be a good idea
;; to require that UID is unset here, and force users
;; to use a /update endpoint to change events. This to prevent
;; accidental overwriting.
(cond
[(get-event-by-uid global-event-object (prop event 'UID))
=> (lambda (old-event)
;; procedure to run after save.
;; used as hook to remove old event from disk below
(define after-save (const #f))
(if (eq? calendar (parent old-event))
(begin (vcomponent-update! old-event event)
;; for save below
(set! event old-event))
;; change calendar
(begin
(format (current-error-port)
"Calendar change~%")
;; remove from runtime
((@ (vcomponent instance methods) remove-event)
global-event-object old-event)
;; Actually puring the old event should be safe,
;; since we first make sure we write the new event to disk.
;; Currently the whole transaction isn't atomic, so a duplicate
;; event can still be created.
(set! after-save
;; remove from disk
(lambda ()
(format (current-error-port)
"Unlinking old event from ~a~%"
(prop old-event '-X-HNH-FILENAME))
((@ (vcomponent vdir save-delete) remove-event) old-event)))
(parameterize ((warnings-are-errors #t))
(catch 'warning
(lambda () (add-event global-event-object calendar event))
(lambda (err fmt args)
(return (build-response code: 400)
(format #f "~?~%" fmt args)))))))
;; NOTE Posibly defer save to a later point.
;; That would allow better asyncronous preformance.
(unless ((@ (vcomponent vdir save-delete) save-event) event)
(return (build-response code: 500)
"Saving event to disk failed."))
(after-save)
(format (current-error-port)
"Event updated ~a~%" (prop event 'UID)))]
[else
(parameterize ((warnings-are-errors #t))
(catch 'warning
(lambda () (add-event global-event-object calendar event))
(lambda (err fmt args)
(return (build-response code: 400)
(format #f "~?~%" fmt args)))))
;; NOTE Posibly defer save to a later point.
;; That would allow better asyncronous preformance.
(unless ((@ (vcomponent vdir save-delete) save-event) event)
(return (build-response code: 500)
"Saving event to disk failed."))
(format (current-error-port)
"Event inserted ~a~%" (prop event 'UID))])
(return '((content-type application/xml))
(with-output-to-string
(lambda ()
(sxml->xml
`(properties
(uid (text ,(prop event 'UID)))))))))))
;; Get specific page by query string instead of by path.
;; Useful for <form>'s, since they always submit in this form, but also
;; useful when javascript is disabled, since a link to "today" needs some
;; form of evaluation when clicked.
(GET "/today" (view date)
(define location
(build-relative-ref
path:
(format #f "/~a/~a.html"
(or view "week")
(date->string
(cond [date => parse-iso-date]
[else (current-date)])
"~1"))) )
(return (build-response
code: 302
headers: `((location . ,location)))))
(GET "/calendar" (start end)
(return '((content-type text/calendar))
(with-output-to-string
(lambda ()
(if (or start end)
(print-events-in-interval
(aif start (parse-iso-date it) (current-date))
(aif end (parse-iso-date it) (current-date)))
(print-all-events))))))
(GET "/calendar/:uid{.*}.xcs" (uid)
(aif (get-event-by-uid global-event-object uid)
(return '((content-type application/calendar+xml))
;; TODO sxml->xml takes a port, would be better
;; to give it the return port imidiately.
(with-output-to-string
;; TODO this is just the vevent part.
;; A surounding vcalendar is required, as well as
;; a doctype.
;; Look into changing how events carry around their
;; parent information, possibly splitting "source parent"
;; and "program parent" into different fields.
(lambda () (sxml->xml ((@ (vcomponent xcal output) vcomponent->sxcal) it)))))
(return (build-response code: 404)
(format #f "No component with UID=~a found." uid))))
(GET "/calendar/:uid{.*}.ics" (uid)
(aif (get-event-by-uid global-event-object uid)
(return '((content-type text/calendar))
(with-output-to-string
(lambda () (print-components-with-fake-parent
(list it)))))
(return (build-response code: 404)
(format #f "No component with UID=~a found." uid))))
;; TODO search without query should work
(GET "/search" (q p)
(define search-term (prepare-string q))
(define q= (find (lambda (s)
(and (<= 2 (string-length s))
(string=? "q=" (string-take s 2))))
(string-split r:query #\&)))
(define paginator (get-query-page search-term))
(define page (string->number (or p "0")))
;; TODO Propagate errors
(define search-result
(catch 'max-page
;; TODO Get-page only puts a time limiter per page, meaning that
;; if a user requests page 1000 the server is stuck trying to
;; find that page, which can take up to 1000 * timeslice = 500s = 8min+
;; A timeout here, and also an actual multithreaded server should
;; solve this.
(lambda () (get-page paginator page))
(lambda (err page-number)
(define location
(build-relative-ref
path: r:path ; host: r:host port: r:port
query: (format #f "~a&p=~a" q= page-number)))
(return (build-response
code: 307
headers: `((location . ,location)))))))
(return '((content-type application/xhtml+xml))
(with-output-to-string
(lambda ()
(sxml->xml
(search-result-page
search-term search-result page paginator q=))))))
;; NOTE this only handles files with extensions. Limited, but since this
;; is mostly for development, and something like nginx should be used in
;; production it isn't a huge problem.
(GET "/static/:*{.*}.:ext" (* ext)
;; Actually parsing /etc/mime.types would be better.
(define mime
(case (string->symbol ext)
[(js) "javascript"]
[else ext]))
(return
`((content-type ,(string->symbol (string-append "text/" mime))))
(call-with-input-file (string-append "static/" * "." ext)
read-string)))
(GET "/static/:*{.*}" (*)
(return
'((content-type text/html))
(sxml->html-string
(directory-table (// "static" *)))))
(GET "/count" ()
;; (sleep 1)
(return '((content-type text/plain))
(string-append (number->string state) "\n")
(1+ state)))))
|
