1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
|
;;; Copyright © 2019 - 2022 Jakob L. Kreuze <zerodaysfordays@sdf.org>
;;;
;;; This program is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License as
;;; published by the Free Software Foundation; either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program. If not, see
;;; <http://www.gnu.org/licenses/>.
(define-module (dynamic capabilities rsvp)
#:use-module (base64)
#:use-module (dynamic util)
#:use-module (ice-9 binary-ports)
#:use-module (ice-9 match)
#:use-module (json)
#:use-module (rnrs bytevectors)
#:use-module (squee)
#:use-module (srfi srfi-1)
#:use-module (srfi srfi-9)
#:use-module (web request)
#:use-module (web response)
#:use-module (web uri)
#:export (get-event-info post-event-rsvp))
;; How many bytes of entropy to use when generating vanity ID's.
(define %vanity-length (make-parameter 9))
;; Path where event header images are stored.
(define %event-image-path-fmt (make-parameter "/home/jakob/event-images/~a.png"))
;; Global handle to the RSVP database.
(define conn (connect-to-postgres-paramstring "dbname=jakob_rsvp"))
(define (generate-vanity-code)
"Generate a random vanity ID.
A vanity ID is used in the RSVP system for creating unique URLs for invitations.
It is a base64 string, encoding `%vanity-length' bytes of randomness."
(call-with-input-file "/dev/urandom"
(lambda (port) (base64-encode (get-bytevector-n port 9)))))
(define (valid-invite-code invitation)
"Check database to see if `invitation' exists."
(and (= (string-length invitation) (base64-length (%vanity-length)))
(positive?
(length
(exec-query conn "SELECT * FROM invitations WHERE vanity = $1"
(list invitation))))))
(define (valid-receipt-code receipt)
"Check database to see if `receipt'."
(and (= (string-length receipt) (base64-length (%vanity-length)))
(positive?
(length
(exec-query conn "SELECT * FROM rsvps WHERE vanity = $1"
(list receipt))))))
(define-record-type <rsvp-create>
(make-rsvp-create-parameters)
rsvp-create-parameters?
(invitation-code rsvp-create-code set-rsvp-create-code!)
(name rsvp-create-name set-rsvp-create-name!)
(email rsvp-create-email set-rsvp-create-email!)
(attending rsvp-create-attending set-rsvp-create-attending!)
(guests rsvp-create-guests set-rsvp-create-guests!))
(define (params->rsvp-create params)
"Parse `params', an alist, into a `<rsvp-create>'."
(let ((res (make-rsvp-create-parameters)))
(set-rsvp-create-code! res (assoc-ref params "id"))
(set-rsvp-create-name! res (assoc-ref params "name"))
(set-rsvp-create-email! res (assoc-ref params "email"))
(set-rsvp-create-attending! res (assoc-ref params "rsvp"))
(set-rsvp-create-guests! res (assoc-ref params "guests"))
(if (any not
(list (rsvp-create-code res)
(rsvp-create-name res)
(rsvp-create-email res)
(rsvp-create-attending res)
(rsvp-create-guests res)))
#f
res)))
(define (invitation->event-id vanity-code)
"For valid `vanity-code', find the corresponding event ID and capabilities."
(car
(exec-query conn "SELECT event_id, capabilities FROM invitations WHERE vanity = $1"
(list vanity-code))))
(define (create-new-event-rsvp params)
"Handler for RSVP'ing to an event."
(let ((params (params->rsvp-create params)))
(cond ((not params)
(values (build-response #:code 400 #:headers '((Access-Control-Allow-Origin . "*")))
(scm->json-string
`((success . #f)
(error . "Invalid form data")))))
((not (valid-invite-code (rsvp-create-code params)))
(values (build-response #:code 400 #:headers '((Access-Control-Allow-Origin . "*")))
(scm->json-string
`((success . #f)
(error . "Invalid invitation code")))))
(else
(let ((receipt-code (generate-vanity-code))
(event-id (car (invitation->event-id (rsvp-create-code params)))))
(exec-query conn
"INSERT INTO rsvps (vanity, invitation_id, event_id, fullname, email, attending, guests) VALUES ($1, $2, $3, $4, $5, $6, $7)"
(list receipt-code
(rsvp-create-code params)
event-id
(rsvp-create-name params)
(rsvp-create-email params)
(rsvp-create-attending params)
(rsvp-create-guests params)))
(values '((content-type . (application/json))
(Access-Control-Allow-Origin . "*"))
(scm->json-string
`((receipt . ,receipt-code)))))))))
(define-record-type <rsvp-update>
(make-rsvp-update-parameters)
rsvp-update-parameters?
(invitation-code rsvp-update-code set-rsvp-update-code!)
(name rsvp-update-name set-rsvp-update-name!)
(email rsvp-update-email set-rsvp-update-email!)
(attending rsvp-update-attending set-rsvp-update-attending!)
(guests rsvp-update-guests set-rsvp-update-guests!))
(define (params->rsvp-update params)
"Parse `params', an alist, into a `<rsvp-update>'."
(let ((res (make-rsvp-update-parameters)))
(set-rsvp-update-code! res (assoc-ref params "update"))
(set-rsvp-update-name! res (assoc-ref params "name"))
(set-rsvp-update-email! res (assoc-ref params "email"))
(set-rsvp-update-attending! res (assoc-ref params "rsvp"))
(set-rsvp-update-guests! res (assoc-ref params "guests"))
(if (any not
(list (rsvp-update-code res)
(rsvp-update-name res)
(rsvp-update-email res)
(rsvp-update-attending res)
(rsvp-update-guests res)))
#f
res)))
(define (update-event-rsvp params)
"Handler for updating an RSVP to an event."
(let ((params (params->rsvp-update params)))
(cond ((not params)
(values (build-response #:code 400 #:headers '((Access-Control-Allow-Origin . "*")))
(scm->json-string
`((success . #f)
(error . "Invalid form data")))))
((not (valid-receipt-code (rsvp-update-code params)))
(values (build-response #:code 400 #:headers '((Access-Control-Allow-Origin . "*")))
(scm->json-string
`((success . #f)
(error . "Invalid receipt code")))))
(else
(exec-query conn
"UPDATE rsvps SET fullname = $2, email = $3, attending = $4, guests = $5 WHERE vanity = $1"
(list
(rsvp-update-code params)
(rsvp-update-name params)
(rsvp-update-email params)
(rsvp-update-attending params)
(rsvp-update-guests params)))
(values '((content-type . (application/json)))
(scm->json-string
`((receipt . ,(rsvp-update-code params)))))))))
(define (post-event-rsvp request body)
"Entry point for RSVP create/update. We dispatch on the parameters."
(let* ((params (json-string->scm (utf8->string body))))
(cond ((assoc-ref params "id") (create-new-event-rsvp params))
((assoc-ref params "update") (update-event-rsvp params))
(else (values (build-response #:code 400 #:headers '((Access-Control-Allow-Origin . "*")))
(scm->json-string
`((success . #f)
(error . "Invalid invite/update code"))))))))
(define (get-event-image event-id)
"Return, as base64, the header image for `event-id'."
(call-with-input-file (format #f (%event-image-path-fmt) event-id)
(lambda (port)
(base64-encode (get-bytevector-all port)))))
(define (get-event-invitation invitation-code)
"Handler for reading information about an event."
(define (format-rsvp rsvp)
(match rsvp
((name email attending guests)
`((name . ,name)
(email . ,email)
(attending . ,attending)
(guests . ,guests)))))
(let* ((invitation (invitation->event-id invitation-code))
(capabilities (cadr invitation))
(event (exec-query conn "SELECT * FROM events WHERE id = $1" (list (car invitation))))
(rsvps (exec-query conn "SELECT fullname, email, attending, guests FROM rsvps WHERE event_id = $1" (list (car invitation)))))
(match (car event)
((i_ title description date location)
(values '((content-type . (application/json))
(Access-Control-Allow-Origin . "*"))
(scm->json-string
`((title . ,title)
(description . ,description)
(image . ,(get-event-image (car invitation)))
(date . ,date)
(location . ,location)
,@(if (= 1 (logand (string->number capabilities) 1))
`((rsvps . ,(list->vector (map format-rsvp rsvps))))
'()))))))))
(define (get-event-receipt receipt-code)
"Handler for reading information about an event, with receipt info."
(define (format-rsvp rsvp)
(match rsvp
((name email attending guests)
`((name . ,name)
(email . ,email)
(attending . ,attending)
(guests . ,guests)))))
(let* ((rsvp (exec-query conn "SELECT invitation_id, fullname, email, attending, guests FROM rsvps WHERE vanity = $1" (list receipt-code)))
(invitation (invitation->event-id (caar rsvp)))
(capabilities (cadr invitation))
(event (exec-query conn "SELECT * FROM events WHERE id = $1" (list (car invitation))))
(rsvps (exec-query conn "SELECT fullname, email, attending, guests FROM rsvps WHERE event_id = $1" (list (car invitation)))))
(match (car event)
((i_ title description date location)
(values '((content-type . (application/json))
(Access-Control-Allow-Origin . "*"))
(scm->json-string
`((title . ,title)
(description . ,description)
(image . ,(get-event-image (car invitation)))
(date . ,date)
(location . ,location)
(name . ,(list-ref (car rsvp) 1))
(email . ,(list-ref (car rsvp) 2))
(attending . ,(list-ref (car rsvp) 3))
(guests . ,(list-ref (car rsvp) 4))
,@(if (= 1 (logand (string->number capabilities) 1))
`((rsvps . ,(list->vector (map format-rsvp rsvps))))
'()))))))))
(define (get-event-info request body)
"Entry point to `get-event-receipt'/`get-event-invitation'."
(let* ((query-string (uri-query (request-uri request)))
(params (if query-string
(decode-form query-string)
'()))
(invitation-code (assoc-ref params "i"))
(receipt-code (assoc-ref params "r")))
(cond ((and receipt-code (valid-receipt-code (car receipt-code)))
(get-event-receipt (car receipt-code)))
((and invitation-code (valid-invite-code (car invitation-code)))
(get-event-invitation (car invitation-code)))
(else
(values (build-response #:code 400 #:headers '((Access-Control-Allow-Origin . "*")))
(scm->json-string
`((success . #f)
(error . "Invalid invitation or receipt code"))))))))
|
