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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 | ||
53 | (our $PROG = $0) =~ s:^.*/::; | |
54 | ||
55 | sub fail_cmdline ($$%) { | |
56 | my ($msg, $label, %args) = @_; | |
57 | print STDERR "$PROG: $msg\n"; | |
58 | exit 1; | |
59 | } | |
60 | ||
61 | our $FAILPROC = \&fail_cmdline; | |
62 | ||
63 | sub fail ($;$%) { | |
64 | my ($msg, $label, %args) = @_; | |
65 | $FAILPROC->($msg, $label, %args); | |
66 | } | |
67 | ||
68 | sub set_mason_failproc ($) { | |
69 | my ($m) = @_; | |
70 | $FAILPROC = sub { | |
71 | my ($msg, $label, %args) = @_; | |
72 | $m->clear_buffer; | |
73 | $m->comp($label, %args); | |
74 | $m->abort; | |
75 | }; | |
76 | } | |
77 | ||
78 | sub nice_name ($) { | |
79 | my ($s) = @_; | |
80 | $s =~ s/\W+//g; | |
81 | return lc $s; | |
82 | } | |
83 | ||
84 | ###-------------------------------------------------------------------------- | |
85 | ### Database utilities. | |
86 | ||
87 | sub open_db (@) { | |
88 | my @attr = @_; | |
89 | my $db = DBI->connect_cached($DSN, undef, undef, { | |
90 | PrintError => 0, | |
91 | RaiseError => 1, | |
92 | @attr | |
93 | }); | |
94 | ||
95 | my $drv = $db->{Driver}{Name}; | |
96 | if ($drv eq "Pg") { | |
97 | $db->{private_odin_retry_p} = sub { $db->state =~ /^40[0P]01$/ }; | |
98 | $db->{private_odin_unixstamp} = sub { "extract(epoch from $_[0])" }; | |
99 | } elsif ($drv eq "SQLite") { | |
100 | $db->{private_odin_retry_p} = sub { $db->err == 5 }; | |
101 | $db->{private_odin_unixstamp} = sub { "strftime('%s', $_[0])" }; | |
102 | } else { | |
103 | fail "unsupported database driver `$drv' (patches welcome)", undef; | |
104 | } | |
105 | ||
106 | return $db; | |
107 | } | |
108 | ||
109 | sub xact (&$) { | |
110 | my ($body, $db) = @_; | |
111 | my @rv; | |
112 | my $exc; | |
113 | ||
114 | my ($sleep, $maxsleep, $mult, $minvar, $maxvar) = @BACKOFF; | |
115 | for (my $i = 0; $i < $RETRY; $i++) { | |
116 | $db->begin_work; | |
117 | eval { @rv = $body->(); $db->commit; }; | |
118 | $exc = $@; | |
119 | return @rv unless $exc; | |
120 | my $retryp = $db->{private_odin_retry_p}(); | |
121 | eval { $db->rollback; }; | |
122 | die $exc unless $retryp; | |
123 | my $t = $sleep * ($minvar + rand($maxvar - $minvar)); | |
124 | $sleep *= $mult; $sleep = $max if $sleep > $max; | |
125 | select undef, undef, undef, $t; | |
126 | } | |
127 | die $exc; | |
128 | } | |
129 | ||
130 | sub sql_timestamp ($$) { | |
131 | my ($db, $col) = @_; | |
132 | return $db->{private_odin_unixstamp}->($col); | |
133 | } | |
134 | ||
135 | ###-------------------------------------------------------------------------- | |
136 | ### Sequence numbers and tagging. | |
137 | ||
138 | sub next_seq ($$) { | |
139 | my ($db, $table) = @_; | |
140 | my ($seq) = $db->selectrow_array("SELECT seq FROM $table"); | |
141 | die "no sequence number in $table" unless defined $seq; | |
142 | $db->do("UPDATE $table SET seq = ?", undef, $seq + 1); | |
143 | return $seq; | |
144 | } | |
145 | ||
146 | my $ALPHABET = | |
147 | "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"; | |
148 | my $NALPHA = length $ALPHABET; | |
149 | ||
150 | sub encode_tag ($) { | |
151 | my ($seq) = @_; | |
152 | my $tag = ""; | |
153 | while ($seq) { | |
154 | $tag .= substr($ALPHABET, $seq % $NALPHA, 1); | |
155 | $seq = int $seq/$NALPHA; | |
156 | } | |
157 | return $tag; | |
158 | } | |
159 | ||
160 | ###-------------------------------------------------------------------------- | |
161 | ### HTTP utilities. | |
162 | ||
163 | our %COOKIE; | |
164 | sub fetch_cookies ($) { | |
165 | my ($r) = @_; | |
166 | ||
167 | %COOKIE = (); | |
168 | my $cookies = $r->header_in("Cookie"); | |
169 | if (defined $cookies) { | |
170 | for my $kv (split /;/, $cookies) { | |
171 | my ($k, $v) = split /=/, $kv, 2; | |
172 | $k =~ s/^\s*(|\S|\S.*\S)\s*$/$1/; | |
173 | $v =~ s/^\s*(|\S|\S.*\S)\s*$/$1/; | |
174 | $v =~ s/\+/ /g; | |
175 | $v =~ s/\%([0-9a-f][0-9a-f])/chr hex $1/eg; | |
176 | $COOKIE{$k} = $v; | |
177 | } | |
178 | } | |
179 | } | |
180 | ||
181 | sub bake_cookie ($$%) { | |
182 | my ($r, $cookie, %attr) = @_; | |
183 | merge_hash %attr, %COOKIE_DEFAULTS; | |
184 | my @attr = map { | |
185 | my $v = $attr{$_}; tr/_-/-/d; | |
186 | defined $v ? "$_=$v" : $_ | |
187 | } keys %attr; | |
188 | $r->headers_out->add("Set-Cookie", join "; ", $cookie, @attr); | |
189 | } | |
190 | ||
191 | sub path_info ($) { | |
192 | my ($r) = @_; | |
193 | return $ENV{PATH_INFO} // $r->path_info; | |
194 | } | |
195 | ||
196 | ###-------------------------------------------------------------------------- | |
197 | ### HTML utilities. | |
198 | ||
199 | sub escapify ($$;$) { | |
200 | my ($m, $s, $mode) = @_; | |
201 | return $m->interp->apply_escapes($s, $mode // "h"); | |
202 | } | |
203 | ||
204 | ###-------------------------------------------------------------------------- | |
205 | ### Access control. | |
206 | ||
207 | our ($WHO, $WHOSURE); | |
208 | our ($WHOMATCH, $WHOCMP, $WHOPAT); | |
209 | ||
210 | sub cgi_who ($) { | |
211 | my ($r) = @_; | |
212 | my $raddr = $ENV{REMOTE_ADDR} // $r->connection->remote_ip; | |
213 | $WHO = ":NET-$raddr"; $WHOSURE = 0; | |
214 | $WHOMATCH = "LIKE"; $WHOCMP = ":NET-\%"; $WHOPAT = qr/^:NET-/; | |
215 | } | |
216 | ||
217 | sub cmdline_who () { | |
218 | $WHO = $ENV{USERV_USER} | |
219 | // ($< == $> && $ENV{USER}) | |
220 | // @{[getpwuid $<]}[0] | |
221 | // die "nameless user"; | |
222 | $WHOMATCH = "="; $WHOCMP = $WHO; $WHOPAT = qr/^\Q$WHO\E$/; | |
223 | $WHOSURE = 1; | |
224 | } | |
225 | ||
226 | sub new_editkey () { | |
227 | open my $fh, "/dev/urandom" or die "open urandom: $!"; | |
228 | sysread $fh, my $rand, 16; | |
229 | (my $edit = encode_base64 $rand) =~ tr:+/=\n:.-:d; | |
230 | return $edit, sha256_hex $edit; | |
231 | } | |
232 | ||
233 | ###-------------------------------------------------------------------------- | |
234 | ### URL shortening. | |
235 | ||
236 | sub get_shorturl ($) { | |
237 | my ($tag) = @_; | |
238 | ||
239 | my $db = open_db; | |
240 | my ($url) = $db->selectrow_array | |
241 | ("SELECT url FROM odin_shorturl WHERE tag = ?", undef, $tag); | |
242 | fail "tag `$tag' not found", ".notfound", tag => $tag unless defined $url; | |
243 | return $url; | |
244 | } | |
245 | ||
246 | sub valid_url_p ($) { | |
247 | my ($url) = @_; | |
248 | return | |
249 | length $url < $URLMAXLEN && | |
250 | scalar grep { $url =~ /$_/ } @URLPAT; | |
251 | } | |
252 | ||
253 | sub new_shorturl ($) { | |
254 | my ($url) = @_; | |
255 | ||
256 | valid_url_p $url or fail "invalid url", ".badurl", u => $url; | |
257 | ||
258 | my $db = open_db; | |
259 | my $tag; | |
260 | xact { | |
261 | ($tag) = $db->selectrow_array | |
262 | ("SELECT tag FROM odin_shorturl WHERE owner $WHOMATCH ? AND url = ?", | |
263 | undef, $WHOCMP, $url); | |
264 | unless (defined $tag) { | |
265 | $tag = encode_tag(next_seq($db, "odin_shorturl_seq")); | |
266 | $db->do("INSERT INTO odin_shorturl (tag, owner, url) VALUES (?, ?, ?)", | |
267 | undef, $tag, $WHO, $url); | |
268 | } | |
269 | } $db; | |
270 | return $tag; | |
271 | } | |
272 | ||
273 | sub check_shorturl_owner ($$) { | |
274 | my ($db, $tag) = @_; | |
275 | ||
276 | my ($owner) = $db->selectrow_array | |
277 | ("SELECT owner FROM odin_shorturl WHERE tag = ?", undef, $tag); | |
278 | fail "tag `$tag' not found", ".notfound", tag => $tag | |
279 | unless defined $owner; | |
280 | fail "not owner of `$tag'", ".notowner", tag => $tag | |
281 | unless $owner =~ /$WHOPAT/; | |
282 | } | |
283 | ||
284 | sub update_shorturl ($$) { | |
285 | my ($tag, $url) = @_; | |
286 | ||
287 | my $db = open_db; | |
288 | xact { | |
289 | check_shorturl_owner $db, $tag; | |
290 | $db->do("UPDATE odin_shorturl SET url = ? WHERE tag = ?", | |
291 | undef, $url, $tag); | |
292 | } $db; | |
293 | } | |
294 | ||
295 | sub delete_shorturl (@) { | |
296 | my (@tags) = @_; | |
297 | ||
298 | my $db = open_db; | |
299 | xact { | |
300 | for my $tag (@tags) { | |
301 | check_shorturl_owner $db, $tag; | |
302 | $db->do("DELETE FROM odin_shorturl WHERE tag = ?", undef, $tag); | |
303 | } | |
304 | } $db; | |
305 | } | |
306 | ||
307 | ###-------------------------------------------------------------------------- | |
308 | ### Paste bin. | |
309 | ||
310 | our %PASTEBIN_DEFAULTS = ( | |
311 | title => "(untitled)", | |
97a33b9c | 312 | lang => "txt", |
be24e9af MW |
313 | content => "" |
314 | ); | |
315 | our @PASTEBIN_PROPS = keys %PASTEBIN_DEFAULTS; | |
316 | our $PASTEBIN_PROPCOLS = join ", ", @PASTEBIN_PROPS; | |
317 | our $PASTEBIN_PROPPLACES = join ", ", map "?", @PASTEBIN_PROPS; | |
318 | ||
319 | sub new_pastebin (\%) { | |
320 | my ($new) = @_; | |
321 | ||
322 | my $db = open_db; | |
323 | my ($editkey, $hash) = new_editkey; | |
324 | my $tag; | |
325 | ||
326 | merge_hash %$new, %PASTEBIN_DEFAULTS; | |
327 | xact { | |
328 | $tag = encode_tag next_seq $db, "odin_pastebin_seq"; | |
329 | $db->do("INSERT INTO odin_pastebin | |
330 | (tag, edithash, owner, $PASTEBIN_PROPCOLS) | |
331 | VALUES (?, ?, ?, $PASTEBIN_PROPPLACES)", undef, | |
332 | $tag, $hash, $WHO, @{$new}{@PASTEBIN_PROPS}); | |
333 | } $db; | |
334 | return $tag, $editkey; | |
335 | } | |
336 | ||
337 | sub get_pastebin ($$\%) { | |
338 | my ($db, $tag, $props) = @_; | |
339 | ||
340 | (my $owner, my $hash, @{$props}{@PASTEBIN_PROPS}) = | |
341 | $db->selectrow_array("SELECT owner, edithash, $PASTEBIN_PROPCOLS | |
342 | FROM odin_pastebin WHERE tag = ?", | |
343 | undef, $tag); | |
344 | fail "tag `$tag' not found", ".notfound", tag => $tag | |
345 | unless defined $owner; | |
346 | return $owner, $hash; | |
347 | } | |
348 | ||
349 | sub get_pastebin_check_owner ($$\%) { | |
350 | my ($db, $tag, $props) = @_; | |
351 | ||
352 | my ($owner, $hash) = get_pastebin $db, $tag, %$props; | |
353 | fail "not owner of `$tag'", ".notowner", tag => $tag | |
354 | unless $WHOSURE && $WHO eq $owner; | |
355 | } | |
356 | ||
357 | sub get_pastebin_check_editkey_or_owner ($$$\%) { | |
358 | my ($db, $tag, $editkey, $props) = @_; | |
359 | ||
360 | if (!defined $editkey) { get_pastebin_check_owner $db, $tag, %$props; } | |
361 | else { | |
362 | my ($owner, $hash) = get_pastebin $db, $tag, %$props; | |
363 | fail "incorrect edit key for `$tag'", ".badhash", tag => $tag | |
364 | unless $hash eq sha256_hex $editkey; | |
365 | } | |
366 | } | |
367 | ||
368 | sub rekey_pastebin ($) { | |
369 | my ($tag) = @_; | |
370 | ||
371 | my $db = open_db; | |
372 | my $editkey; | |
373 | xact { | |
374 | get_pastebin_check_owner $db, $tag, my %hunoz; | |
375 | ($editkey, my $hash) = new_editkey; | |
376 | $db->do("UPDATE odin_pastebin SET edithash = ? WHERE tag = ?", | |
377 | undef, $hash, $tag); | |
378 | } $db; | |
379 | return $editkey; | |
380 | } | |
381 | ||
382 | sub claim_pastebin ($$) { | |
383 | my ($tag, $editkey) = @_; | |
384 | ||
385 | my $db = open_db; | |
386 | $WHOSURE or fail "you can't claim pastes", ".notsure"; | |
387 | xact { | |
388 | get_pastebin_check_editkey_or_owner $db, $tag, $editkey, my %hunoz; | |
389 | $db->do("UPDATE odin_pastebin SET owner = ? WHERE tag = ?", | |
390 | undef, $WHO, $tag); | |
391 | } $db; | |
392 | } | |
393 | ||
394 | sub update_pastebin ($$\%) { | |
395 | my ($tag, $editkey, $new) = @_; | |
396 | ||
397 | my $db = open_db; | |
398 | my $editp = 0; | |
399 | xact { | |
400 | get_pastebin_check_editkey_or_owner $db, $tag, $editkey, my %old; | |
401 | for my $p (@PASTEBIN_PROPS) { | |
402 | if (!defined $new->{$p}) { $new->{$p} = $old{$p}; } | |
403 | else { | |
404 | $db->do("UPDATE odin_pastebin SET $p = ? WHERE tag = ?", | |
405 | undef, $new->{$p}, $tag) | |
406 | unless $new->{$p} eq $old{$p}; | |
407 | $editp = 1; | |
408 | } | |
409 | } | |
410 | } $db; | |
411 | return $editp; | |
412 | } | |
413 | ||
414 | sub delete_pastebin (@) { | |
415 | my @a = @_; | |
416 | my $db = open_db; | |
417 | xact { | |
418 | while (@a) { | |
419 | (my $tag, my $editkey, @a) = @a; | |
420 | get_pastebin_check_editkey_or_owner $db, $tag, $editkey, my %hunoz; | |
421 | $db->do("DELETE FROM odin_pastebin WHERE tag = ?", undef, $tag); | |
422 | } | |
423 | } $db; | |
424 | } | |
425 | ||
426 | sub tidy_pastebin_content ($) { | |
427 | my ($content) = @_; | |
428 | return undef unless defined $content; | |
429 | $content =~ tr/\r//d; | |
430 | $content =~ s/([^\n])\z/$1\n/; | |
431 | return $content; | |
432 | } | |
433 | ||
f0bcb39a MW |
434 | ###-------------------------------------------------------------------------- |
435 | ### Simple option parser. | |
436 | ||
437 | package Odin::OptParse; | |
438 | ||
439 | sub new { | |
440 | my ($cls, @args) = @_; | |
441 | return bless { | |
442 | cur => "", | |
443 | args => \@args, | |
444 | opt => undef, | |
445 | ok => 1 | |
446 | }, $cls; | |
447 | } | |
448 | ||
449 | sub get { | |
450 | my ($me) = @_; | |
451 | if (!length $me->{cur}) { | |
452 | my $args = $me->{args}; | |
453 | if (!@$args) { return undef; } | |
454 | elsif ($args->[0] =~ /^[^-]|^-$/) { return undef; } | |
455 | elsif ($args->[0] eq "--") { shift @$args; return undef; } | |
456 | $me->{cur} = substr shift @$args, 1; | |
457 | } | |
458 | my $o = $me->{opt} = substr $me->{cur}, 0, 1; | |
459 | $me->{cur} = substr $me->{cur}, 1; | |
460 | return $o; | |
461 | } | |
462 | ||
463 | sub arg { | |
464 | my ($me) = @_; | |
465 | my $a; | |
466 | if (length $me->{cur}) { $a = $me->{cur}; $me->{cur} = ""; } | |
467 | elsif (@{$me->{args}}) { $a = shift @{$me->{args}}; } | |
468 | else { $a = undef; $me->err("option `-$me->{opt}' requires an argument"); } | |
469 | return $a; | |
470 | } | |
471 | ||
472 | sub rest { return @{$_[0]->{args}}; } | |
473 | sub ok { return $_[0]->{ok}; } | |
474 | sub bad { $_[0]->{ok} = 0; } | |
475 | sub err { $_[0]->bad; print STDERR "$PROG: $_[1]\n"; } | |
476 | sub unk { $_[0]->err("unknown option `-$_[0]->{opt}'"); } | |
477 | ||
be24e9af MW |
478 | ###----- That's all, folks -------------------------------------------------- |
479 | ||
480 | 1; |