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be24e9af MW |
1 | ### -*-perl-*- |
2 | ||
3 | package Odin; | |
4 | ||
5 | use DBI; | |
6 | use Digest::SHA qw(sha256_hex); | |
7 | use MIME::Base64; | |
8 | ||
9 | ###-------------------------------------------------------------------------- | |
10 | ### Early utilities. | |
11 | ||
12 | sub merge_hash (\%%) { | |
13 | my ($hashref, %defaults) = @_; | |
14 | for my $k (keys %defaults) | |
15 | { $hashref->{$k} = $defaults{$k} unless exists $hashref->{$k}; } | |
16 | } | |
17 | ||
18 | ###-------------------------------------------------------------------------- | |
19 | ### Configuration. | |
20 | ||
21 | our $DSN = "dbi:Pg(pg_enable_utf8=>1):host=db"; | |
22 | our $RETRY = 10; | |
23 | our @BACKOFF = (0.1, 10, 1.5, 0.5, 2.0); | |
24 | ||
25 | our $BASEURL = "http://odin.gg/"; | |
26 | our $STATIC = "http://odin.gg/"; | |
27 | ||
28 | our $SHORTURL_PATH = "u"; | |
29 | our $PASTEBIN_PATH = "p"; | |
30 | ||
31 | our $URLMAXLEN = 1024; | |
32 | our @URLPAT = ( | |
33 | qr{^https?://} | |
34 | ); | |
35 | ||
36 | our %COOKIE_DEFAULTS = ( | |
37 | -httponly => undef, | |
38 | -max_age => 3600 | |
39 | ); | |
40 | ||
41 | require "config.pl"; | |
42 | ||
43 | our ($SCHEME, $DOMAIN, $BASEPATH) = $BASEURL =~ m!^([^:]+)://([^/]+)(/.*)$!; | |
44 | merge_hash %COOKIE_DEFAULTS, -domain => $DOMAIN, -path => $BASEPATH; | |
45 | merge_hash %COOKIE_DEFAULTS, -secure => undef if $SCHEME eq "https"; | |
46 | ||
47 | our $SHORTURL = "$BASEURL$SHORTURL_PATH"; | |
48 | our $PASTEBIN = "$BASEURL$PASTEBIN_PATH"; | |
49 | ||
50 | ###-------------------------------------------------------------------------- | |
51 | ### Miscellaneous utilities. | |
52 | ||
503f7910 MW |
53 | our $NOW; |
54 | sub update_now () { $NOW = time; } | |
55 | update_now; | |
56 | ||
be24e9af MW |
57 | (our $PROG = $0) =~ s:^.*/::; |
58 | ||
59 | sub fail_cmdline ($$%) { | |
60 | my ($msg, $label, %args) = @_; | |
61 | print STDERR "$PROG: $msg\n"; | |
62 | exit 1; | |
63 | } | |
64 | ||
65 | our $FAILPROC = \&fail_cmdline; | |
66 | ||
67 | sub fail ($;$%) { | |
68 | my ($msg, $label, %args) = @_; | |
69 | $FAILPROC->($msg, $label, %args); | |
70 | } | |
71 | ||
72 | sub set_mason_failproc ($) { | |
73 | my ($m) = @_; | |
74 | $FAILPROC = sub { | |
75 | my ($msg, $label, %args) = @_; | |
76 | $m->clear_buffer; | |
77 | $m->comp($label, %args); | |
78 | $m->abort; | |
79 | }; | |
80 | } | |
81 | ||
82 | sub nice_name ($) { | |
83 | my ($s) = @_; | |
84 | $s =~ s/\W+//g; | |
85 | return lc $s; | |
86 | } | |
87 | ||
88 | ###-------------------------------------------------------------------------- | |
89 | ### Database utilities. | |
90 | ||
91 | sub open_db (@) { | |
92 | my @attr = @_; | |
93 | my $db = DBI->connect_cached($DSN, undef, undef, { | |
94 | PrintError => 0, | |
95 | RaiseError => 1, | |
96 | @attr | |
97 | }); | |
98 | ||
99 | my $drv = $db->{Driver}{Name}; | |
100 | if ($drv eq "Pg") { | |
101 | $db->{private_odin_retry_p} = sub { $db->state =~ /^40[0P]01$/ }; | |
be24e9af MW |
102 | } elsif ($drv eq "SQLite") { |
103 | $db->{private_odin_retry_p} = sub { $db->err == 5 }; | |
be24e9af | 104 | } else { |
3300e9a2 | 105 | $db->{private_odin_retry_p} = sub { 0 }; |
be24e9af MW |
106 | } |
107 | ||
108 | return $db; | |
109 | } | |
110 | ||
111 | sub xact (&$) { | |
112 | my ($body, $db) = @_; | |
113 | my @rv; | |
114 | my $exc; | |
115 | ||
116 | my ($sleep, $maxsleep, $mult, $minvar, $maxvar) = @BACKOFF; | |
117 | for (my $i = 0; $i < $RETRY; $i++) { | |
118 | $db->begin_work; | |
119 | eval { @rv = $body->(); $db->commit; }; | |
120 | $exc = $@; | |
121 | return @rv unless $exc; | |
122 | my $retryp = $db->{private_odin_retry_p}(); | |
123 | eval { $db->rollback; }; | |
124 | die $exc unless $retryp; | |
125 | my $t = $sleep * ($minvar + rand($maxvar - $minvar)); | |
126 | $sleep *= $mult; $sleep = $max if $sleep > $max; | |
127 | select undef, undef, undef, $t; | |
128 | } | |
129 | die $exc; | |
130 | } | |
131 | ||
be24e9af MW |
132 | |
133 | ###-------------------------------------------------------------------------- | |
134 | ### Sequence numbers and tagging. | |
135 | ||
136 | sub next_seq ($$) { | |
137 | my ($db, $table) = @_; | |
138 | my ($seq) = $db->selectrow_array("SELECT seq FROM $table"); | |
139 | die "no sequence number in $table" unless defined $seq; | |
140 | $db->do("UPDATE $table SET seq = ?", undef, $seq + 1); | |
141 | return $seq; | |
142 | } | |
143 | ||
144 | my $ALPHABET = | |
145 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; | |
146 | my $NALPHA = length $ALPHABET; | |
147 | ||
148 | sub encode_tag ($) { | |
149 | my ($seq) = @_; | |
150 | my $tag = ""; | |
151 | while ($seq) { | |
152 | $tag .= substr($ALPHABET, $seq % $NALPHA, 1); | |
153 | $seq = int $seq/$NALPHA; | |
154 | } | |
155 | return $tag; | |
156 | } | |
157 | ||
158 | ###-------------------------------------------------------------------------- | |
159 | ### HTTP utilities. | |
160 | ||
161 | our %COOKIE; | |
162 | sub fetch_cookies ($) { | |
163 | my ($r) = @_; | |
164 | ||
165 | %COOKIE = (); | |
166 | my $cookies = $r->header_in("Cookie"); | |
167 | if (defined $cookies) { | |
168 | for my $kv (split /;/, $cookies) { | |
169 | my ($k, $v) = split /=/, $kv, 2; | |
170 | $k =~ s/^\s*(|\S|\S.*\S)\s*$/$1/; | |
171 | $v =~ s/^\s*(|\S|\S.*\S)\s*$/$1/; | |
172 | $v =~ s/\+/ /g; | |
173 | $v =~ s/\%([0-9a-f][0-9a-f])/chr hex $1/eg; | |
174 | $COOKIE{$k} = $v; | |
175 | } | |
176 | } | |
177 | } | |
178 | ||
179 | sub bake_cookie ($$%) { | |
180 | my ($r, $cookie, %attr) = @_; | |
181 | merge_hash %attr, %COOKIE_DEFAULTS; | |
182 | my @attr = map { | |
183 | my $v = $attr{$_}; tr/_-/-/d; | |
184 | defined $v ? "$_=$v" : $_ | |
185 | } keys %attr; | |
186 | $r->headers_out->add("Set-Cookie", join "; ", $cookie, @attr); | |
187 | } | |
188 | ||
189 | sub path_info ($) { | |
190 | my ($r) = @_; | |
191 | return $ENV{PATH_INFO} // $r->path_info; | |
192 | } | |
193 | ||
194 | ###-------------------------------------------------------------------------- | |
195 | ### HTML utilities. | |
196 | ||
197 | sub escapify ($$;$) { | |
198 | my ($m, $s, $mode) = @_; | |
199 | return $m->interp->apply_escapes($s, $mode // "h"); | |
200 | } | |
201 | ||
202 | ###-------------------------------------------------------------------------- | |
203 | ### Access control. | |
204 | ||
205 | our ($WHO, $WHOSURE); | |
206 | our ($WHOMATCH, $WHOCMP, $WHOPAT); | |
207 | ||
208 | sub cgi_who ($) { | |
209 | my ($r) = @_; | |
210 | my $raddr = $ENV{REMOTE_ADDR} // $r->connection->remote_ip; | |
211 | $WHO = ":NET-$raddr"; $WHOSURE = 0; | |
212 | $WHOMATCH = "LIKE"; $WHOCMP = ":NET-\%"; $WHOPAT = qr/^:NET-/; | |
213 | } | |
214 | ||
215 | sub cmdline_who () { | |
216 | $WHO = $ENV{USERV_USER} | |
217 | // ($< == $> && $ENV{USER}) | |
218 | // @{[getpwuid $<]}[0] | |
219 | // die "nameless user"; | |
220 | $WHOMATCH = "="; $WHOCMP = $WHO; $WHOPAT = qr/^\Q$WHO\E$/; | |
221 | $WHOSURE = 1; | |
222 | } | |
223 | ||
224 | sub new_editkey () { | |
225 | open my $fh, "/dev/urandom" or die "open urandom: $!"; | |
226 | sysread $fh, my $rand, 16; | |
227 | (my $edit = encode_base64 $rand) =~ tr:+/=\n:.-:d; | |
228 | return $edit, sha256_hex $edit; | |
229 | } | |
230 | ||
231 | ###-------------------------------------------------------------------------- | |
232 | ### URL shortening. | |
233 | ||
234 | sub get_shorturl ($) { | |
235 | my ($tag) = @_; | |
236 | ||
237 | my $db = open_db; | |
238 | my ($url) = $db->selectrow_array | |
239 | ("SELECT url FROM odin_shorturl WHERE tag = ?", undef, $tag); | |
240 | fail "tag `$tag' not found", ".notfound", tag => $tag unless defined $url; | |
241 | return $url; | |
242 | } | |
243 | ||
244 | sub valid_url_p ($) { | |
245 | my ($url) = @_; | |
246 | return | |
247 | length $url < $URLMAXLEN && | |
248 | scalar grep { $url =~ /$_/ } @URLPAT; | |
249 | } | |
250 | ||
251 | sub new_shorturl ($) { | |
252 | my ($url) = @_; | |
253 | ||
254 | valid_url_p $url or fail "invalid url", ".badurl", u => $url; | |
255 | ||
256 | my $db = open_db; | |
257 | my $tag; | |
258 | xact { | |
259 | ($tag) = $db->selectrow_array | |
260 | ("SELECT tag FROM odin_shorturl WHERE owner $WHOMATCH ? AND url = ?", | |
261 | undef, $WHOCMP, $url); | |
262 | unless (defined $tag) { | |
263 | $tag = encode_tag(next_seq($db, "odin_shorturl_seq")); | |
3300e9a2 MW |
264 | $db->do("INSERT INTO odin_shorturl (tag, stamp, owner, url) |
265 | VALUES (?, ?, ?, ?)", undef, | |
266 | $tag, $NOW, $WHO, $url); | |
be24e9af MW |
267 | } |
268 | } $db; | |
269 | return $tag; | |
270 | } | |
271 | ||
272 | sub check_shorturl_owner ($$) { | |
273 | my ($db, $tag) = @_; | |
274 | ||
275 | my ($owner) = $db->selectrow_array | |
276 | ("SELECT owner FROM odin_shorturl WHERE tag = ?", undef, $tag); | |
277 | fail "tag `$tag' not found", ".notfound", tag => $tag | |
278 | unless defined $owner; | |
279 | fail "not owner of `$tag'", ".notowner", tag => $tag | |
280 | unless $owner =~ /$WHOPAT/; | |
281 | } | |
282 | ||
283 | sub update_shorturl ($$) { | |
284 | my ($tag, $url) = @_; | |
285 | ||
286 | my $db = open_db; | |
287 | xact { | |
288 | check_shorturl_owner $db, $tag; | |
289 | $db->do("UPDATE odin_shorturl SET url = ? WHERE tag = ?", | |
290 | undef, $url, $tag); | |
291 | } $db; | |
292 | } | |
293 | ||
294 | sub delete_shorturl (@) { | |
295 | my (@tags) = @_; | |
296 | ||
297 | my $db = open_db; | |
298 | xact { | |
299 | for my $tag (@tags) { | |
300 | check_shorturl_owner $db, $tag; | |
301 | $db->do("DELETE FROM odin_shorturl WHERE tag = ?", undef, $tag); | |
302 | } | |
303 | } $db; | |
304 | } | |
305 | ||
306 | ###-------------------------------------------------------------------------- | |
307 | ### Paste bin. | |
308 | ||
309 | our %PASTEBIN_DEFAULTS = ( | |
310 | title => "(untitled)", | |
97a33b9c | 311 | lang => "txt", |
be24e9af MW |
312 | content => "" |
313 | ); | |
314 | our @PASTEBIN_PROPS = keys %PASTEBIN_DEFAULTS; | |
315 | our $PASTEBIN_PROPCOLS = join ", ", @PASTEBIN_PROPS; | |
316 | our $PASTEBIN_PROPPLACES = join ", ", map "?", @PASTEBIN_PROPS; | |
317 | ||
318 | sub new_pastebin (\%) { | |
319 | my ($new) = @_; | |
320 | ||
321 | my $db = open_db; | |
322 | my ($editkey, $hash) = new_editkey; | |
323 | my $tag; | |
324 | ||
325 | merge_hash %$new, %PASTEBIN_DEFAULTS; | |
326 | xact { | |
327 | $tag = encode_tag next_seq $db, "odin_pastebin_seq"; | |
328 | $db->do("INSERT INTO odin_pastebin | |
3300e9a2 MW |
329 | (tag, stamp, edithash, owner, $PASTEBIN_PROPCOLS) |
330 | VALUES (?, ?, ?, ?, $PASTEBIN_PROPPLACES)", undef, | |
331 | $tag, $NOW, $hash, $WHO, @{$new}{@PASTEBIN_PROPS}); | |
be24e9af MW |
332 | } $db; |
333 | return $tag, $editkey; | |
334 | } | |
335 | ||
336 | sub get_pastebin ($$\%) { | |
337 | my ($db, $tag, $props) = @_; | |
338 | ||
339 | (my $owner, my $hash, @{$props}{@PASTEBIN_PROPS}) = | |
340 | $db->selectrow_array("SELECT owner, edithash, $PASTEBIN_PROPCOLS | |
341 | FROM odin_pastebin WHERE tag = ?", | |
342 | undef, $tag); | |
343 | fail "tag `$tag' not found", ".notfound", tag => $tag | |
344 | unless defined $owner; | |
345 | return $owner, $hash; | |
346 | } | |
347 | ||
348 | sub get_pastebin_check_owner ($$\%) { | |
349 | my ($db, $tag, $props) = @_; | |
350 | ||
351 | my ($owner, $hash) = get_pastebin $db, $tag, %$props; | |
352 | fail "not owner of `$tag'", ".notowner", tag => $tag | |
353 | unless $WHOSURE && $WHO eq $owner; | |
354 | } | |
355 | ||
356 | sub get_pastebin_check_editkey_or_owner ($$$\%) { | |
357 | my ($db, $tag, $editkey, $props) = @_; | |
358 | ||
359 | if (!defined $editkey) { get_pastebin_check_owner $db, $tag, %$props; } | |
360 | else { | |
361 | my ($owner, $hash) = get_pastebin $db, $tag, %$props; | |
362 | fail "incorrect edit key for `$tag'", ".badhash", tag => $tag | |
363 | unless $hash eq sha256_hex $editkey; | |
364 | } | |
365 | } | |
366 | ||
367 | sub rekey_pastebin ($) { | |
368 | my ($tag) = @_; | |
369 | ||
370 | my $db = open_db; | |
371 | my $editkey; | |
372 | xact { | |
373 | get_pastebin_check_owner $db, $tag, my %hunoz; | |
374 | ($editkey, my $hash) = new_editkey; | |
375 | $db->do("UPDATE odin_pastebin SET edithash = ? WHERE tag = ?", | |
376 | undef, $hash, $tag); | |
377 | } $db; | |
378 | return $editkey; | |
379 | } | |
380 | ||
381 | sub claim_pastebin ($$) { | |
382 | my ($tag, $editkey) = @_; | |
383 | ||
384 | my $db = open_db; | |
385 | $WHOSURE or fail "you can't claim pastes", ".notsure"; | |
386 | xact { | |
387 | get_pastebin_check_editkey_or_owner $db, $tag, $editkey, my %hunoz; | |
388 | $db->do("UPDATE odin_pastebin SET owner = ? WHERE tag = ?", | |
389 | undef, $WHO, $tag); | |
390 | } $db; | |
391 | } | |
392 | ||
393 | sub update_pastebin ($$\%) { | |
394 | my ($tag, $editkey, $new) = @_; | |
395 | ||
396 | my $db = open_db; | |
397 | my $editp = 0; | |
398 | xact { | |
399 | get_pastebin_check_editkey_or_owner $db, $tag, $editkey, my %old; | |
400 | for my $p (@PASTEBIN_PROPS) { | |
401 | if (!defined $new->{$p}) { $new->{$p} = $old{$p}; } | |
402 | else { | |
403 | $db->do("UPDATE odin_pastebin SET $p = ? WHERE tag = ?", | |
404 | undef, $new->{$p}, $tag) | |
405 | unless $new->{$p} eq $old{$p}; | |
406 | $editp = 1; | |
407 | } | |
408 | } | |
409 | } $db; | |
410 | return $editp; | |
411 | } | |
412 | ||
413 | sub delete_pastebin (@) { | |
414 | my @a = @_; | |
415 | my $db = open_db; | |
416 | xact { | |
417 | while (@a) { | |
418 | (my $tag, my $editkey, @a) = @a; | |
419 | get_pastebin_check_editkey_or_owner $db, $tag, $editkey, my %hunoz; | |
420 | $db->do("DELETE FROM odin_pastebin WHERE tag = ?", undef, $tag); | |
421 | } | |
422 | } $db; | |
423 | } | |
424 | ||
425 | sub tidy_pastebin_content ($) { | |
426 | my ($content) = @_; | |
427 | return undef unless defined $content; | |
428 | $content =~ tr/\r//d; | |
429 | $content =~ s/([^\n])\z/$1\n/; | |
430 | return $content; | |
431 | } | |
432 | ||
f0bcb39a MW |
433 | ###-------------------------------------------------------------------------- |
434 | ### Simple option parser. | |
435 | ||
436 | package Odin::OptParse; | |
437 | ||
438 | sub new { | |
439 | my ($cls, @args) = @_; | |
440 | return bless { | |
441 | cur => "", | |
442 | args => \@args, | |
443 | opt => undef, | |
444 | ok => 1 | |
445 | }, $cls; | |
446 | } | |
447 | ||
448 | sub get { | |
449 | my ($me) = @_; | |
450 | if (!length $me->{cur}) { | |
451 | my $args = $me->{args}; | |
452 | if (!@$args) { return undef; } | |
453 | elsif ($args->[0] =~ /^[^-]|^-$/) { return undef; } | |
454 | elsif ($args->[0] eq "--") { shift @$args; return undef; } | |
455 | $me->{cur} = substr shift @$args, 1; | |
456 | } | |
457 | my $o = $me->{opt} = substr $me->{cur}, 0, 1; | |
458 | $me->{cur} = substr $me->{cur}, 1; | |
459 | return $o; | |
460 | } | |
461 | ||
462 | sub arg { | |
463 | my ($me) = @_; | |
464 | my $a; | |
465 | if (length $me->{cur}) { $a = $me->{cur}; $me->{cur} = ""; } | |
466 | elsif (@{$me->{args}}) { $a = shift @{$me->{args}}; } | |
467 | else { $a = undef; $me->err("option `-$me->{opt}' requires an argument"); } | |
468 | return $a; | |
469 | } | |
470 | ||
471 | sub rest { return @{$_[0]->{args}}; } | |
472 | sub ok { return $_[0]->{ok}; } | |
473 | sub bad { $_[0]->{ok} = 0; } | |
474 | sub err { $_[0]->bad; print STDERR "$PROG: $_[1]\n"; } | |
475 | sub unk { $_[0]->err("unknown option `-$_[0]->{opt}'"); } | |
476 | ||
be24e9af MW |
477 | ###----- That's all, folks -------------------------------------------------- |
478 | ||
479 | 1; |