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
|
#!/usr/bin/perl
use strict;
use warnings;
use utf8;
use Time::Piece;
use Sys::Syslog qw(:standard :macros);
use OpenBSD::Pledge;
use OpenBSD::Unveil;
my $dict_dir = '/var/www/var/lex/dict';
my $state_file = '/var/www/var/lex/mailer.tsv';
my $to = 'me@example.com';
my $from = 'lex@example.com';
my $from_header = "Lex <$from>";
my $subject = 'Daily word';
my $sendmail = '/usr/sbin/sendmail';
my $syslog_tag = 'lex-mail';
# Connect to /dev/log before pledge/unveil so no late 'unix'
# socket creation occurs
openlog($syslog_tag, 'ndelay,pid', LOG_MAIL);
unveil($dict_dir, 'r') or log_die("unveil $dict_dir: $!");
unveil($state_file, 'rwc') or log_die("unveil $state_file: $!");
unveil($sendmail, 'rx') or log_die("unveil $sendmail: $!");
unveil('/etc/mailer.conf', 'r') or log_die("unveil /etc/mailer.conf: $!");
unveil('/var/run/smtpd.sock', 'rw') or log_die("unveil smtpd.sock: $!");
unveil('/dev/log', 'w') or log_die("unveil /dev/log: $!"); # Writing to pre-opened socket handle
unveil(); # Lock unveil rules
pledge(qw(stdio rpath wpath cpath proc exec)) or log_die("pledge: $!");
sub log_die {
my ($msg) = @_;
syslog(LOG_ERR, "%s", $msg);
closelog();
die $msg;
}
# Read dictionary files
my $dh;
if (!opendir($dh, $dict_dir)) {
log_die("Cannot open $dict_dir: $!");
}
my @current_files = grep { -f "$dict_dir/$_" && !/^\./ } readdir($dh);
closedir($dh);
if (!@current_files) {
syslog(LOG_WARNING, "No files found in %s", $dict_dir);
# Truncate state file if it exists
if (-f $state_file) {
if (open(my $clear_fh, '>', $state_file)) {
close($clear_fh);
} else {
syslog(LOG_ERR, "Failed to clear %s: %s", $state_file, $!);
}
}
closelog();
exit 0;
}
my %active_files = map { $_ => 1 } @current_files;
my %state;
my $today = localtime->ymd;
if (-f $state_file) {
my $sfh;
if (!open($sfh, '<', $state_file)) {
log_die("Cannot open $state_file: $!");
}
while (my $line = <$sfh>) {
chomp $line;
next if $line =~ /^\s*$/;
my ($file, $next_due, $interval, $reviews, $factor) = split(/\t/, $line);
if ($file && $active_files{$file}) {
$state{$file} = {
next_due => $next_due // $today,
interval => $interval // 1,
reviews => $reviews // 0,
factor => $factor // 2.5,
};
}
}
close($sfh);
}
# Initialize new files not yet in tsv
foreach my $file (@current_files) {
if (!$state{$file}) {
$state{$file} = {
next_due => $today,
interval => 1,
reviews => 0,
factor => 2.5,
};
}
}
# Select candidate file (spaced repetition)
my @due_files = grep { $state{$_}{next_due} le $today } @current_files;
my $selected_file;
if (@due_files) {
$selected_file = $due_files[rand @due_files];
} else {
@current_files = sort { $state{$a}{next_due} cmp $state{$b}{next_due} } @current_files;
$selected_file = $current_files[0];
syslog(LOG_INFO, "No files due today; falling back to nearest due file: %s", $selected_file);
}
# Read content
my $file_path = "$dict_dir/$selected_file";
my $fh;
if (!open($fh, '<:utf8', $file_path)) {
log_die("Cannot open $file_path: $!");
}
local $/; # slurp mode
my $body = <$fh>;
close($fh);
# Send email via direct pipe
my $mail_pipe;
if (!open($mail_pipe, '|-', $sendmail, '-i', '-f', $from, $to)) {
log_die("Cannot execute $sendmail: $!");
}
binmode($mail_pipe, ':utf8');
print $mail_pipe "From: $from_header\n";
print $mail_pipe "To: $to\n";
print $mail_pipe "Subject: $subject - $selected_file\n";
print $mail_pipe "Content-Type: text/plain; charset=UTF-8\n\n";
print $mail_pipe $body;
if (!close($mail_pipe)) {
log_die("Error closing pipe to sendmail: $!");
}
# Update schedule
my $item = $state{$selected_file};
my $interval = $item->{interval};
my $factor = $item->{factor};
if ($item->{reviews} == 0) {
$interval = 1;
} elsif ($item->{reviews} == 1) {
$interval = 6;
} else {
$interval = int($interval * $factor);
}
$item->{interval} = $interval;
$item->{reviews} += 1;
my $now = localtime;
$item->{next_due} = ($now + ($interval * 86400))->ymd;
# Toss deleted files from the tsv.
foreach my $file (keys %state) {
delete $state{$file} unless $active_files{$file};
}
my $out_fh;
if (!open($out_fh, '>', $state_file)) {
log_die("Cannot write to $state_file: $!");
}
foreach my $file (keys %state) {
my $i = $state{$file};
print $out_fh join("\t", $file, $i->{next_due}, $i->{interval}, $i->{reviews}, $i->{factor}), "\n";
}
close($out_fh);
syslog(LOG_INFO, "Mailed %s to %s (next due: %s)", $selected_file, $to, $item->{next_due});
closelog();
|
