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59539
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use strict; |
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use warnings; |
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package Email::MessageID; |
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# ABSTRACT: Generate world unique message-ids. |
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$Email::MessageID::VERSION = '1.406'; |
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3321
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use overload '""' => 'as_string', fallback => 1; |
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2575
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#pod =head1 SYNOPSIS |
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#pod |
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#pod use Email::MessageID; |
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#pod |
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#pod my $mid = Email::MessageID->new->in_brackets; |
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#pod |
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#pod print "Message-ID: $mid\x0D\x0A"; |
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#pod |
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#pod =head1 DESCRIPTION |
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#pod |
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#pod Message-ids are optional, but highly recommended, headers that identify a |
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#pod message uniquely. This software generates a unique message-id. |
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#pod |
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#pod =method new |
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#pod |
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#pod my $mid = Email::MessageID->new; |
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#pod |
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#pod my $new_mid = Email::MessageID->new( host => $myhost ); |
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#pod |
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#pod This class method constructs an L<Email::Address|Email::Address> object |
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#pod containing a unique message-id. You may specify custom C<host> and C<user> |
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#pod parameters. |
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#pod |
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#pod By default, the C<host> is generated from C<Sys::Hostname::hostname>. |
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#pod |
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#pod By default, the C<user> is generated using C<Time::HiRes>'s C<gettimeofday> |
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#pod and the process ID. |
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#pod |
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#pod Using these values we have the ability to ensure world uniqueness down to |
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#pod a specific process running on a specific host, and the exact time down to |
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#pod six digits of microsecond precision. |
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#pod |
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#pod =cut |
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sub new { |
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1003
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1003
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1
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my ($class, %args) = @_; |
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1003
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66
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2002
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$args{user} ||= $class->create_user; |
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1003
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66
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2142
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$args{host} ||= $class->create_host; |
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1003
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3671
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my $str = "$args{user}\@$args{host}"; |
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50
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1003
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1942
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bless \$str => $class; |
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} |
52
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53
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#pod =method create_host |
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#pod |
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#pod my $domain_part = Email::MessageID->create_host; |
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#pod |
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#pod This method returns the domain part of the message-id. |
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#pod |
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#pod =cut |
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61
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my $_SYS_HOSTNAME_LONG; |
62
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sub create_host { |
63
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1001
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100
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1001
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1
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1292
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unless (defined $_SYS_HOSTNAME_LONG) { |
64
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2
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50
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4
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$_SYS_HOSTNAME_LONG = (eval { require Sys::Hostname::Long; 1 }) || 0; |
65
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2
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50
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1078
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require Sys::Hostname unless $_SYS_HOSTNAME_LONG; |
66
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} |
67
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68
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1001
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50
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4236
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return $_SYS_HOSTNAME_LONG ? Sys::Hostname::Long::hostname_long() |
69
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: Sys::Hostname::hostname(); |
70
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} |
71
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72
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#pod =method create_user |
73
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#pod |
74
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#pod my $local_part = Email::MessageID->create_user; |
75
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#pod |
76
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#pod This method returns a unique local part for the message-id. It includes some |
77
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#pod random data and some predictable data. |
78
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#pod |
79
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#pod =cut |
80
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81
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my @CHARS = ('A'..'F','a'..'f',0..9); |
82
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83
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my %uniq; |
84
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85
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sub create_user { |
86
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my $noise = join '', |
87
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1001
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1001
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1
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1558
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map {; $CHARS[rand @CHARS] } (0 .. (3 + int rand 6)); |
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6435
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7705
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88
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89
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1001
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1289
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my $t = time; |
90
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1001
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100
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1491
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my $u = exists $uniq{$t} ? ++$uniq{$t} : (%uniq = ($t => 0))[1]; |
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92
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1001
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1538
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my $user = join '.', $t . $u, $noise, $$; |
93
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1001
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2052
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return $user; |
94
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} |
95
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96
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#pod =method in_brackets |
97
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#pod |
98
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#pod When using Email::MessageID directly to populate the C<Message-ID> field, be |
99
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#pod sure to use C<in_brackets> to get the string inside angle brackets: |
100
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#pod |
101
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#pod header => [ |
102
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#pod ... |
103
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#pod 'Message-Id' => Email::MessageID->new->in_brackets, |
104
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#pod ], |
105
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#pod |
106
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#pod Don't make this common mistake: |
107
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#pod |
108
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#pod header => [ |
109
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#pod ... |
110
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#pod 'Message-Id' => Email::MessageID->new->as_string, # WRONG! |
111
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#pod ], |
112
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#pod |
113
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#pod =for Pod::Coverage address as_string host user |
114
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#pod |
115
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#pod =cut |
116
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117
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2
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2
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0
|
1384
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sub user { (split /@/, ${ $_[0] }, 2)[0] } |
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2
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50
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118
|
2
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2
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0
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523
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sub host { (split /@/, ${ $_[0] }, 2)[1] } |
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2
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17
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119
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120
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sub in_brackets { |
121
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0
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0
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1
|
0
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my ($self) = @_; |
122
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0
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0
|
return "<$$self>"; |
123
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} |
124
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125
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sub address { |
126
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1000
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1000
|
0
|
798
|
my ($self) = @_; |
127
|
1000
|
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|
2742
|
return "$$self"; |
128
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} |
129
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130
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sub as_string { |
131
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0
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0
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0
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my ($self) = @_; |
132
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0
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return "$$self"; |
133
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} |
134
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135
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1; |
136
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137
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__END__ |
138
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139
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=pod |
140
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141
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=encoding UTF-8 |
142
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143
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=head1 NAME |
144
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|
145
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|
Email::MessageID - Generate world unique message-ids. |
146
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147
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|
|
=head1 VERSION |
148
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149
|
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|
|
version 1.406 |
150
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151
|
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|
|
=head1 SYNOPSIS |
152
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153
|
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|
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use Email::MessageID; |
154
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155
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my $mid = Email::MessageID->new->in_brackets; |
156
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157
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print "Message-ID: $mid\x0D\x0A"; |
158
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159
|
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|
|
=head1 DESCRIPTION |
160
|
|
|
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|
|
|
161
|
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|
|
|
|
Message-ids are optional, but highly recommended, headers that identify a |
162
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|
|
|
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message uniquely. This software generates a unique message-id. |
163
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164
|
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|
|
=head1 METHODS |
165
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166
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=head2 new |
167
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168
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my $mid = Email::MessageID->new; |
169
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170
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my $new_mid = Email::MessageID->new( host => $myhost ); |
171
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172
|
|
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|
|
|
|
This class method constructs an L<Email::Address|Email::Address> object |
173
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|
|
|
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containing a unique message-id. You may specify custom C<host> and C<user> |
174
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|
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|
|
|
|
parameters. |
175
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176
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By default, the C<host> is generated from C<Sys::Hostname::hostname>. |
177
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|
|
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|
178
|
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|
|
|
By default, the C<user> is generated using C<Time::HiRes>'s C<gettimeofday> |
179
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|
|
|
|
and the process ID. |
180
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|
|
|
|
|
|
|
181
|
|
|
|
|
|
|
Using these values we have the ability to ensure world uniqueness down to |
182
|
|
|
|
|
|
|
a specific process running on a specific host, and the exact time down to |
183
|
|
|
|
|
|
|
six digits of microsecond precision. |
184
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|
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|
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185
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|
|
|
|
=head2 create_host |
186
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187
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my $domain_part = Email::MessageID->create_host; |
188
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|
189
|
|
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|
|
|
|
This method returns the domain part of the message-id. |
190
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|
191
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|
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|
|
=head2 create_user |
192
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193
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|
my $local_part = Email::MessageID->create_user; |
194
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|
195
|
|
|
|
|
|
|
This method returns a unique local part for the message-id. It includes some |
196
|
|
|
|
|
|
|
random data and some predictable data. |
197
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|
|
|
|
|
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|
198
|
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|
|
=head2 in_brackets |
199
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|
200
|
|
|
|
|
|
|
When using Email::MessageID directly to populate the C<Message-ID> field, be |
201
|
|
|
|
|
|
|
sure to use C<in_brackets> to get the string inside angle brackets: |
202
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|
|
|
|
|
|
|
203
|
|
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|
|
|
header => [ |
204
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... |
205
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'Message-Id' => Email::MessageID->new->in_brackets, |
206
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|
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], |
207
|
|
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|
|
|
|
208
|
|
|
|
|
|
|
Don't make this common mistake: |
209
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|
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|
|
|
|
|
210
|
|
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header => [ |
211
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|
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|
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|
|
... |
212
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|
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|
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|
|
'Message-Id' => Email::MessageID->new->as_string, # WRONG! |
213
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], |
214
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215
|
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|
=for Pod::Coverage address as_string host user |
216
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217
|
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|
|
=head1 AUTHORS |
218
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219
|
|
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|
=over 4 |
220
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221
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|
=item * |
222
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223
|
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|
|
Casey West <casey@geeknest.com> |
224
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225
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=item * |
226
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227
|
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|
|
|
Ricardo SIGNES <rjbs@cpan.org> |
228
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=back |
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=head1 CONTRIBUTOR |
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233
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=for stopwords Aaron Crane |
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Aaron Crane <arc@cpan.org> |
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237
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=head1 COPYRIGHT AND LICENSE |
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This software is copyright (c) 2004 by Casey West. |
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This is free software; you can redistribute it and/or modify it under |
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the same terms as the Perl 5 programming language system itself. |
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=cut |