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package Net::WebSocket::Frame; |
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=encoding utf-8 |
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=head1 NAME |
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Net::WebSocket::Frame |
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=head1 SYNOPSIS |
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#Never instantiate Net::WebSocket::Frame directly; |
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#always call new() on a subclass: |
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my $frame = Net::WebSocket::Frame::text->new( |
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fin => 0, #to start a fragmented message |
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rsv => 0b11, #RSV2 and RSV3 are on |
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mask => "\x01\x02\x03\x04 #clients MUST include; servers MUST NOT |
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payload_sr => \'Woot!', |
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); |
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$frame->get_fin(); |
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$frame->get_mask_bytes(); |
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$frame->get_payload(); |
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$frame->set_rsv(); |
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$frame->get_rsv(); |
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$frame->to_bytes(); #for sending over the wire |
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=head1 DESCRIPTION |
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This is the base class for all frame objects. The interface as described |
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above should be fairly straightforward. |
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=head1 EXPERIMENTAL: CUSTOM FRAME CLASSES |
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36
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You can have custom frame classes, e.g., to support WebSocket extensions that |
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use custom frame opcodes. RFC 6455 allocates opcodes 3-7 for data frames and |
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11-15 (0xb - 0xf) for control frames. |
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The best way to do this is to subclass either |
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L or L, |
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depending on what kind of frame you’re dealing with. |
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An example of such a class is below: |
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package My::Custom::Frame::booya; |
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48
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use strict; |
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use warnings; |
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51
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use parent qw( Net::WebSocket::Base::DataFrame ); |
52
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53
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use constant get_opcode => 3; |
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55
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use constant get_type => 'booya'; |
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57
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Note that L still won’t know how to handle such a |
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custom frame, so if you intend to receive custom frames as part of messages, |
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you’ll also need to create a custom base class of this class, then also |
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subclass L. You may additionally want to subclass |
61
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L (or -C<::Client>) if you do streaming. |
62
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63
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B I’m not familiar with any application that |
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actually requires this feature. The C extension seems to |
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be the only one that has much widespread web browser support. |
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67
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=cut |
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55389
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use strict; |
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217
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70
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use warnings; |
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183
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71
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72
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1252
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use Net::WebSocket::Constants (); |
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157
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73
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1298
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use Net::WebSocket::Mask (); |
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19
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146
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74
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9
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985
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use Net::WebSocket::X (); |
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373
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75
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76
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use constant { |
77
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10501
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FIRST2 => 0, |
78
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LEN_LEN => 1, |
79
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MASK => 2, |
80
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PAYLOAD => 3, |
81
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82
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_RSV1 => chr(4 << 4), |
83
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_RSV2 => chr(2 << 4), |
84
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_RSV3 => chr(1 << 4), |
85
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9
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}; |
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13
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86
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87
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#fin, rsv, mask, payload_sr |
88
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#rsv is a bitmask of the three values, with RSV1 as MOST significant bit. |
89
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#So, represent RSV1 and RSV2 being on via 0b110 (= 4 + 2 = 6) |
90
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sub new { |
91
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65
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65
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0
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196
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my ($class, %opts) = @_; |
92
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93
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65
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155
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my ( $fin, $rsv, $mask, $payload_sr ) = @opts{ qw( fin rsv mask payload_sr ) }; |
94
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95
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65
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163
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my $type = $class->get_type(); |
96
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97
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65
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187
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my $opcode = $class->get_opcode($type); |
98
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99
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65
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100
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120
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if (!defined $fin) { |
100
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6
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8
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$fin = 1; |
101
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} |
102
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103
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65
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100
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139
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$payload_sr ||= \do { my $v = q<> }; |
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2
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11
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104
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105
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65
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147
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my ($byte2, $len_len) = $class->_assemble_length($payload_sr); |
106
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107
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65
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100
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115
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if (defined $mask) { |
108
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53
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97
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_validate_mask($mask); |
109
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110
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53
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50
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77
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if (length $mask) { |
111
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53
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71
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$byte2 |= "\x80"; |
112
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53
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97
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Net::WebSocket::Mask::apply($payload_sr, $mask); |
113
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} |
114
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} |
115
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else { |
116
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12
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22
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$mask = q<>; |
117
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} |
118
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119
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65
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116
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my $first2 = chr $opcode; |
120
|
65
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100
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118
|
$first2 |= "\x80" if $fin; |
121
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122
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65
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100
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111
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if ($rsv) { |
123
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5
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50
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10
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die "“rsv” must be < 0-7!" if $rsv > 7; |
124
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5
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11
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$first2 |= chr( $rsv << 4 ); |
125
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} |
126
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127
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65
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98
|
substr( $first2, 1, 0, $byte2 ); |
128
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129
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65
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245
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return bless [ \$first2, \$len_len, \$mask, $payload_sr ], $class; |
130
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} |
131
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132
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sub set_payload_sr { |
133
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0
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0
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0
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0
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my ($self, $new_payload_sr) = @_; |
134
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135
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0
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0
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my ($byte2, $len_len) = $self->_assemble_length($new_payload_sr); |
136
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137
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0
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0
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0
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if (length ${ $self->[2] }) { |
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0
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0
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138
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0
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0
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$byte2 |= "\x80"; |
139
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0
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0
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Net::WebSocket::Mask::apply($new_payload_sr, ${ $self->[2] }); |
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0
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0
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140
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} |
141
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142
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0
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0
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substr( ${ $self->[0] }, 1, 1, $byte2 ); |
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0
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0
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143
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0
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0
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@{$self}[1, 3] = (\$len_len, $new_payload_sr); |
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0
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0
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144
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145
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0
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0
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return $self; |
146
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} |
147
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148
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# All string refs: first2, length octets, mask octets, payload |
149
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sub create_from_parse { |
150
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83
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83
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0
|
345
|
return bless \@_, shift; |
151
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} |
152
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153
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sub get_mask_bytes { |
154
|
95
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95
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0
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213
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my ($self) = @_; |
155
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156
|
95
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|
112
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return ${ $self->[MASK] }; |
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95
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255
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157
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} |
158
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159
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#To collect the goods |
160
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sub get_payload { |
161
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94
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94
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0
|
1259
|
my ($self) = @_; |
162
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163
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94
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119
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my $pl = "" . ${ $self->[PAYLOAD] }; |
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94
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246
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164
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165
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94
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100
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205
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if (my $mask = $self->get_mask_bytes()) { |
166
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58
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111
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Net::WebSocket::Mask::apply( \$pl, $mask ); |
167
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} |
168
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169
|
94
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499
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return $pl; |
170
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} |
171
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172
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#For sending over the wire |
173
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sub to_bytes { |
174
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59
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59
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0
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111
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my ($self) = @_; |
175
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176
|
59
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136
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return join( q<>, map { $$_ } @$self ); |
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236
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917
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177
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} |
178
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179
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sub get_rsv { |
180
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0
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0
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0
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0
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my ($self) = @_; |
181
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182
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#0b01110000 = 0x70 |
183
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0
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0
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return( ord( substr( ${ $self->[FIRST2] }, 0, 1 ) & "\x70" ) >> 4 ); |
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0
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0
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184
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} |
185
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186
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|
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|
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sub set_rsv { |
187
|
0
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0
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0
|
0
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my ($self, $rsv) = @_; |
188
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189
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0
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0
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${ $self->[FIRST2] } |= chr( $rsv << 4 ); |
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0
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0
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190
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191
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0
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0
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return $self; |
192
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} |
193
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194
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sub set_rsv1 { |
195
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0
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|
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0
|
0
|
0
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${ $_[0][FIRST2] } |= _RSV1(); |
|
0
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0
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196
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197
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0
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0
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return $_[0]; |
198
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} |
199
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|
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200
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|
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sub set_rsv2 { |
201
|
0
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|
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0
|
0
|
0
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${ $_[0][FIRST2] } |= _RSV2(); |
|
0
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0
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202
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203
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0
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0
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return $_[0]; |
204
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|
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} |
205
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206
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sub set_rsv3 { |
207
|
0
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|
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0
|
0
|
0
|
${ $_[0][FIRST2] } |= _RSV3(); |
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0
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0
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208
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209
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0
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0
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return $_[0]; |
210
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} |
211
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212
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sub has_rsv1 { |
213
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0
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0
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0
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0
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return ("\0\0" ne (${ $_[0][FIRST2] } & _RSV1())); |
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0
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0
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214
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} |
215
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216
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sub has_rsv2 { |
217
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0
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0
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0
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0
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return ("\0\0" ne (${ $_[0][FIRST2] } & _RSV2())); |
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0
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0
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218
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} |
219
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220
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sub has_rsv3 { |
221
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0
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0
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0
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0
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return ("\0\0" ne (${ $_[0][FIRST2] } & _RSV3())); |
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0
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0
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222
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} |
223
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224
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#---------------------------------------------------------------------- |
225
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#Redundancies with methods in DataFrame.pm and ControlFrame.pm. |
226
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#These are here so that we don’t have to re-bless in order to get this |
227
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#information. |
228
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229
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sub is_control_frame { |
230
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0
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0
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0
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0
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my ($self) = @_; |
231
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232
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#8 == 0b1000 == 010 |
233
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0
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0
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0
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return( ($self->_extract_opcode() & 8) ? 1 : 0 ); |
234
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} |
235
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236
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sub get_fin { |
237
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7
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7
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0
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14
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my ($self) = @_; |
238
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239
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7
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100
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8
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return( ord ("\x80" & ${$self->[$self->FIRST2]}) && 1 ); |
240
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} |
241
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242
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#---------------------------------------------------------------------- |
243
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244
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#sub get_opcode { |
245
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# my ($class) = @_; |
246
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# |
247
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# die "$class (type “$type”) must define a custom get_opcode() method!"; |
248
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#} |
249
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250
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#---------------------------------------------------------------------- |
251
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252
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#Unneeded? |
253
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#sub set_mask_bytes { |
254
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# my ($self, $bytes) = @_; |
255
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# |
256
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# if (!defined $bytes) { |
257
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# die "Set either a 4-byte mask, or empty string!"; |
258
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# } |
259
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# |
260
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# if (length $bytes) { |
261
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# _validate_mask($bytes); |
262
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# |
263
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|
# $self->_activate_highest_bit( $self->[FIRST2], 1 ); |
264
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|
# } |
265
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# else { |
266
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|
# $self->_deactivate_highest_bit( $self->[FIRST2], 1 ); |
267
|
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|
# } |
268
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|
# |
269
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|
|
# if (${ $self->[MASK] }) { |
270
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|
|
# Net::WebSocket::Mask::apply( $self->[PAYLOAD], ${ $self->[MASK] } ); |
271
|
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|
# } |
272
|
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|
# |
273
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|
|
# $self->[MASK] = \$bytes; |
274
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|
# |
275
|
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|
|
# if ($bytes) { |
276
|
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|
|
# Net::WebSocket::Mask::apply( $self->[PAYLOAD], $bytes ); |
277
|
|
|
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|
|
|
# } |
278
|
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|
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|
|
|
# |
279
|
|
|
|
|
|
|
# return $self; |
280
|
|
|
|
|
|
|
#} |
281
|
|
|
|
|
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|
|
282
|
|
|
|
|
|
|
#---------------------------------------------------------------------- |
283
|
|
|
|
|
|
|
|
284
|
|
|
|
|
|
|
sub opcode_to_type { |
285
|
0
|
|
|
0
|
0
|
0
|
my ($class, $opcode) = @_; |
286
|
0
|
|
|
|
|
0
|
return Net::WebSocket::Constants::opcode_to_type($opcode); |
287
|
|
|
|
|
|
|
} |
288
|
|
|
|
|
|
|
|
289
|
|
|
|
|
|
|
our $AUTOLOAD; |
290
|
|
|
|
|
|
|
sub AUTOLOAD { |
291
|
148
|
|
|
148
|
|
21714
|
my ($self) = shift; |
292
|
|
|
|
|
|
|
|
293
|
148
|
50
|
|
|
|
1279
|
return if substr( $AUTOLOAD, -8 ) eq ':DESTROY'; |
294
|
|
|
|
|
|
|
|
295
|
0
|
|
|
|
|
0
|
my $last_colon_idx = rindex( $AUTOLOAD, ':' ); |
296
|
0
|
|
|
|
|
0
|
my $method = substr( $AUTOLOAD, 1 + $last_colon_idx ); |
297
|
|
|
|
|
|
|
|
298
|
|
|
|
|
|
|
#Figure out what type this is, and re-bless. |
299
|
0
|
0
|
|
|
|
0
|
if (ref($self) eq __PACKAGE__) { |
300
|
0
|
|
|
|
|
0
|
my $opcode = $self->_extract_opcode(); |
301
|
0
|
|
|
|
|
0
|
my $type = $self->opcode_to_type($opcode); |
302
|
|
|
|
|
|
|
|
303
|
0
|
|
|
|
|
0
|
my $class = __PACKAGE__ . "::$type"; |
304
|
0
|
0
|
|
|
|
0
|
if (!$class->can('new')) { |
305
|
0
|
|
|
|
|
0
|
Module::Load::load($class); |
306
|
|
|
|
|
|
|
} |
307
|
|
|
|
|
|
|
|
308
|
0
|
|
|
|
|
0
|
bless $self, $class; |
309
|
|
|
|
|
|
|
|
310
|
0
|
0
|
|
|
|
0
|
if ($self->can($method)) { |
311
|
0
|
|
|
|
|
0
|
return $self->$method(@_); |
312
|
|
|
|
|
|
|
} |
313
|
|
|
|
|
|
|
} |
314
|
|
|
|
|
|
|
|
315
|
0
|
|
0
|
|
|
0
|
my $class = (ref $self) || $self; |
316
|
|
|
|
|
|
|
|
317
|
0
|
|
|
|
|
0
|
die( "$class has no method “$method”!" ); |
318
|
|
|
|
|
|
|
} |
319
|
|
|
|
|
|
|
|
320
|
|
|
|
|
|
|
#---------------------------------------------------------------------- |
321
|
|
|
|
|
|
|
|
322
|
|
|
|
|
|
|
sub _extract_opcode { |
323
|
0
|
|
|
0
|
|
0
|
my ($self) = @_; |
324
|
|
|
|
|
|
|
|
325
|
0
|
|
|
|
|
0
|
return 0xf & ord substr( ${ $self->[FIRST2] }, 0, 1 ); |
|
0
|
|
|
|
|
0
|
|
326
|
|
|
|
|
|
|
} |
327
|
|
|
|
|
|
|
|
328
|
|
|
|
|
|
|
sub _validate_mask { |
329
|
53
|
|
|
53
|
|
71
|
my ($bytes) = @_; |
330
|
|
|
|
|
|
|
|
331
|
53
|
50
|
|
|
|
85
|
if (length $bytes) { |
332
|
53
|
50
|
|
|
|
85
|
if (4 != length $bytes) { |
333
|
0
|
|
|
|
|
0
|
my $len = length $bytes; |
334
|
0
|
|
|
|
|
0
|
die "Mask must be 4 bytes long, not $len ($bytes)!"; |
335
|
|
|
|
|
|
|
} |
336
|
|
|
|
|
|
|
} |
337
|
|
|
|
|
|
|
|
338
|
53
|
|
|
|
|
71
|
return; |
339
|
|
|
|
|
|
|
} |
340
|
|
|
|
|
|
|
|
341
|
|
|
|
|
|
|
sub _activate_highest_bit { |
342
|
0
|
|
|
0
|
|
|
my ($self, $sr, $offset) = @_; |
343
|
|
|
|
|
|
|
|
344
|
0
|
|
|
|
|
|
substr( $$sr, $offset, 1 ) = chr( 0x80 | ord substr( $$sr, $offset, 1 ) ); |
345
|
|
|
|
|
|
|
|
346
|
0
|
|
|
|
|
|
return; |
347
|
|
|
|
|
|
|
} |
348
|
|
|
|
|
|
|
|
349
|
|
|
|
|
|
|
sub _deactivate_highest_bit { |
350
|
0
|
|
|
0
|
|
|
my ($sr, $offset) = @_; |
351
|
|
|
|
|
|
|
|
352
|
0
|
|
|
|
|
|
substr( $$sr, $offset, 1 ) = chr( 0x7f & ord substr( $$sr, $offset, 1 ) ); |
353
|
|
|
|
|
|
|
|
354
|
0
|
|
|
|
|
|
return; |
355
|
|
|
|
|
|
|
} |
356
|
|
|
|
|
|
|
|
357
|
|
|
|
|
|
|
1; |