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
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
|
#!/usr/bin/env luajit
local function escape(s)
return s:gsub("<", "<"):gsub("<", "<")
end
local function urldecode(s)
if s == nil then return nil end
return s:gsub("+", " "):gsub("%%20", " ")
end
local function urlencode(s)
if s == nil then return nil end
return s:gsub(" ", "%%20")
end
local function parse_query(q)
if q == nil then return {} end
local data = {}
for pair in string.gmatch(q, "([^&]+)") do
local flag = string.match(pair, "^([^=]+)$")
if flag ~= nil then
data[flag] = "1"
else
local key, value = string.match(pair, "^([^=]+)=([^=]*)$")
if key ~= nil and value ~= nil then
data[key] = urldecode(value)
end
end
end
return data
end
local function load_config()
local log = io.open("config", "r")
if log == nil then return {} end
local config = {}
for l in log:lines("l") do
if l ~= "" and l[0] ~= "#" then
local key, value = string.match(l, "^([^=]+)=([^=]*)")
if key ~= nil and value ~= nil then
config[key] = value
end
end
end
return config
end
local config = load_config()
local path = os.getenv("PATH_INFO")
local method = os.getenv("REQUEST_METHOD")
local query = parse_query(os.getenv("QUERY_STRING"))
local stylesheet = [[
/* body { background-color: #161616; }
h1, h2, h3, h4, h5, h6, p, label, a { color: #e2e2e2; } */
.amount-presets form { display: inline-block; width: 60px }
.amount-pos { color: green; }
.amount-neg { color: red; }
nav h2 { display: inline-block }
.notif { padding: 0.5em; margin: 0.5em; background-color: #ddd; }
.notif.error { background-color: #faa; }
.notif p { margin: 5px; }
form.box { border: 2px solid grey; padding: 0.5em; margin: 0.5em; display: inline-block; }
form h3 { margin: 5px; }
]]
local script = [[
document.addEventListener("keypress", ev => {
if (!(document.activeElement instanceof HTMLInputElement)) {
if (ev.code.startsWith("Digit"))
document.forms.buy_product.product.value += ev.code.substring(5)
if (ev.code == "Enter")
document.forms.buy_product.submit()
}
})
]]
local function respond(status, title, body)
print(string.format("Status: %d", status))
print("Content-Type: text/html")
print("")
print(string.format([[
<!DOCTYPE html>
<html><head>
<title>%s</title>
<meta charset="utf-8" />
<style>%s</style>
<script>%s</script>
%s
</head>
<body>
<nav>
<h2><a href="/">Strichliste v2</a></h2>
<span><a href="/?log">Log</a></span>
<span><a href="/?products">Products</a></span>
<span><a href="https://codeberg.org/metamuffin/strichliste">Source</a></span>
</nav>
]], escape(title), stylesheet, script, config.head_extra or ""))
body()
print("</body></html>")
end
local function respond_error(message)
respond(400, "Error", function()
print(string.format("<p>Error: %s</p>", escape(message)))
end)
end
local function redirect(path)
print("Status: 307")
print(string.format("Location: %s", path))
print()
end
local function form_data()
return parse_query(io.read())
end
local function format_duration(t)
if t > 86400 then return string.format("%d day%s", t / 86400, math.floor(t / 86400) ~= 1 and "s" or "") end
if t > 3600 then return string.format("%d hour%s", t / 3600, math.floor(t / 3600) ~= 1 and "s" or "") end
if t > 60 then return string.format("%d minute%s", t / 60, math.floor(t / 60) ~= 1 and "s" or "") end
return string.format("%d seconds", t)
end
local function read_log()
local log = io.open("log", "r")
if log == nil then
return function() return nil end
end
local lines = log:lines("l")
return function()
local l = lines()
if l == "" or l == nil then
return nil
end
local time, username, amount, comment = string.match(l, "(%d+),([%w_ -]+),(-?%d+),([%w_ -]*)")
return tonumber(time), username, tonumber(amount), comment
end
end
local function read_products()
local log = io.open("products", "r")
if log == nil then
return function() return nil end
end
local lines = log:lines("l")
return function()
local l = lines()
if l == "" or l == nil then
return nil
end
local barcode, amount, name = string.match(l, "([%w_-]+),(-?%d+),([%w_ -]*)")
return barcode, tonumber(amount), name
end
end
local function balances()
local users = {}
for _, username, amount, _ in read_log() do
users[username] = (users[username] or 0) + amount
end
return users
end
local function last_txns()
local users = {}
for time, username, _, _ in read_log() do
users[username] = time
end
return users
end
local function error_box(message)
return string.format([[<div class="notif error"><p>Error: %s</p></div>]], message)
end
local function r_user_post(username)
local data = form_data()
local amount = nil
local comment = ""
if data.product then
for p_barcode, p_amount, p_name in read_products() do
if p_barcode == data.product then
amount = p_amount
comment = p_name
end
end
if amount == nil then
return error_box("unknown product")
end
else
amount = tonumber(data.amount)
comment = data.comment or ""
end
if amount == nil then
return error_box("amount invalid")
end
if comment:match("^[%w_ -]*$") == nil then
return error_box("comment invalid")
end
local log = io.open("log", "a+")
if log == nil then
return error_box("failed to open log")
end
local time = os.time()
log:write(string.format("%d,%s,%d,%s\n", time, username, amount, comment))
log:flush()
log:close()
return string.format([[
<div class="notif"><p>Transaction successful: <strong class="amount-%s">%.02f€</strong> (%s)</p></div>
<audio src="%s" autoplay></audio>
]],
amount >= 0 and "pos" or "neg", amount / 100,
escape(comment),
config.transaction_sound or ""
)
end
local function r_user(username)
local notif = nil
if method == "POST" then
notif = r_user_post(username)
end
return respond(200, username, function()
print(string.format("<h1>%s</h1>", username))
local balance = balances()[username]
local last_txn = last_txns()[username]
local new_user = balance == nil
balance = balance or 0
if notif then print(notif) end
if new_user then
print([[
<div class="notif"><p><i>This user account does not exist yet. It will only be created after the first transaction.</i></p></div>
]])
else
print(string.format([[
<p>Current balance: <span class="amount-%s">%.02f€</p>
]], balance >= 0 and "pos" or "neg", balance / 100))
print(string.format([[
<p>Last transaction added %s ago. <a href="/%s?log">View user log</a>
]], format_duration(os.time() - last_txn), username))
end
print([[
<form class="transaction box" action="" method="POST">
<h3>Create Transaction</h3>
<label for="amount">Amount: </label>
<input type="number" name="amount" id="amount" /><br/>
<label for="comment">Comment: </label>
<input type="text" name="comment" id="comment" /><br/>
<input type="submit" value="Update" />
</form>
<form class="transaction box" action="" method="POST" id="buy_product">
<h3>Buy Product</h3>
<label for="product">Product: </label>
<input type="text" name="product" id="product" /><br/>
<input type="submit" value="Buy" />
</form>
]])
print([[<div class="amount-presets">]])
for _, type in ipairs({ 1, -1 }) do
for _, amount in ipairs({ 50, 100, 150, 200, 500, 1000 }) do
print(string.format([[
<form action="" method="POST">
<input type="number" name="amount" id="amount" value="%d" hidden />
<input type="text" name="comment" id="comment" value="" hidden />
<input type="submit" value="%s%.02f€" class="amount-%s" />
</form>
]], amount * type, ({ [-1] = "-", [1] = "+" })[type], amount / 100,
({ [-1] = "neg", [1] = "pos" })[type]))
end
print("<br/>")
end
print("</div>")
end)
end
local function r_log(filter)
return respond(200, "Log", function()
print("<table>")
print("<tr><th>Time</th><th>Username</th><th>Amount</th><th>Comment</th></tr>")
for time, username, amount, comment in read_log() do
if filter == nil or filter == username then
print(string.format([[
<tr>
<td>%d (%s ago)</td>
<td>%s</td>
<td class="amount-%s">%.02f€</td>
<td>%s</td>
<td>
<form action="/%s" method="POST">
<input type="number" name="amount" id="amount" value="%d" hidden />
<input type="text" name="comment" id="comment" value="Revert %s" hidden />
<input type="submit" value="Revert" />
</form>
</td>
</tr>
]],
time, format_duration(os.time() - time),
escape(username),
amount >= 0 and "pos" or "neg", amount / 100,
escape(comment),
escape(username),
-amount,
escape(comment)
))
end
end
print("</table>")
end)
end
local function r_index()
return respond(200, "Users", function()
print([[
<form action="/" method="GET" class="box">
<h3>User Creation</h3>
<label for="username">Username: </label>
<input type="text" name="create_user" id="username" /><br/>
<input type="submit" value="Continue" />
</form>
]])
print("<ul>")
for username, balance in pairs(balances()) do
print(string.format([[
<li><a href="/%s">%s</a>: <span class="amount-%s">%.02f€</span></li>
]],
urlencode(username),
escape(username),
balance >= 0 and "pos" or "neg", balance / 100
))
end
print("</ul>")
end)
end
local function r_create_user()
local username = query.create_user
if username:match("^([%w_ -]+)$") == nil then
return respond_error("invalid username " .. username)
end
return redirect(string.format("/%s", urlencode(username)))
end
local function r_products()
respond(200, "Product List", function()
print("<h1>Product List</h1>")
print("<table><tr><th>Name</th><th>Price</th><th>Amount</th></tr>")
for barcode, price, name in read_products() do
print(string.format([[
<tr><td>%s</td><td class="amount-%s">%.02f€</td><td>%s</td></tr>
]],
name,
price >= 0 and "pos" or "neg", price / 100,
barcode
))
end
print("</table>")
end)
end
local function extract_username()
if path == nil then
return respond_error("no path")
end
local username = urldecode(path:sub(2))
if username == nil or username:match("^([%w_ -]+)$") == nil then
return nil
end
return username
end
if path == "/" then
if query.products then
return r_products()
elseif query.log then
return r_log()
elseif query.create_user then
return r_create_user()
else
return r_index()
end
else
local username = extract_username()
if username == nil then
return respond_error("username invalid")
elseif query.log then
return r_log(username)
else
return r_user(username)
end
end
|
