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package Net::WebSocket::Handshake::Server; |
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=encoding utf-8 |
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=head1 NAME |
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Net::WebSocket::Handshake::Server |
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=head1 SYNOPSIS |
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my $hsk = Net::WebSocket::Handshake::Server->new( |
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#optional |
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subprotocols => [ 'echo', 'haha' ], |
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#optional |
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extensions => \@extension_objects, |
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); |
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$hsk->valid_method_or_die( $http_method ); #optional |
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$hsk->consume_headers(@headers_kv_pairs); |
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my $resp_hdr = $hsk->to_string(); |
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=head1 DESCRIPTION |
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This class implements WebSocket handshake logic for a server. |
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It handles the basics of handshaking and, optionally, subprotocol |
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and extension negotiation. |
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=cut |
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use strict; |
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use warnings; |
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use parent qw( Net::WebSocket::Handshake ); |
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use Call::Context (); |
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use Net::WebSocket::Constants (); |
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use Net::WebSocket::X (); |
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#no-op |
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use constant _handle_unrecognized_extension => (); |
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=head2 I->new( %OPTS ) |
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Returns an instance of this class. %OPTS is as described in the base class; |
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there are no options specific to this class. |
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=head2 I->valid_protocol_or_die( PROTOCOL ) |
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Throws an exception if the given PROTOCOL isn’t the HTTP protocol (HTTP/1.1) |
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that WebSocket requires for all requests. |
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You only need this if if you’re not using a request-parsing interface |
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that’s compatible with L; otherwise, |
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L’s C function |
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will do this (and other niceties) for you. |
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=cut |
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sub valid_protocol_or_die { |
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my ($self, $protocol) = @_; |
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67
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if ($protocol ne Net::WebSocket::Constants::REQUIRED_REQUEST_PROTOCOL()) { |
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die Net::WebSocket::X->create('BadRequestProtocol', $protocol); |
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} |
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return; |
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} |
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=head2 I->valid_method_or_die( METHOD ) |
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Throws an exception if the given METHOD isn’t the HTTP method (GET) that |
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WebSocket requires for all requests. |
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As with C, L might |
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call this method for you. |
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=cut |
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sub valid_method_or_die { |
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my ($self, $method) = @_; |
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if ($method ne Net::WebSocket::Constants::REQUIRED_HTTP_METHOD()) { |
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die Net::WebSocket::X->create('BadHTTPMethod', $method); |
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} |
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return; |
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} |
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sub _consume_peer_header { |
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my ($self, $name => $value) = @_; |
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$name =~ tr; #case insensitive |
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if ($name eq 'sec-websocket-version') { |
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if ( $value ne Net::WebSocket::Constants::PROTOCOL_VERSION() ) { |
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die Net::WebSocket::X->create('UnsupportedProtocolVersion', $value); |
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} |
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104
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$self->{'_version_ok'} = 1; |
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} |
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elsif ($name eq 'sec-websocket-key') { |
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5
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if ($value !~ m<\A[A-Za-z0-9/\+]{22}==\z>) { |
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die Net::WebSocket::X->create('BadHeader', 'Sec-WebSocket-Key' => $value); |
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} |
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$self->{'key'} = $value; |
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} |
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elsif ($name eq 'sec-websocket-protocol') { |
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1
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7
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require Net::WebSocket::HTTP; |
115
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116
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1
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4
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for my $token ( Net::WebSocket::HTTP::split_tokens($value) ) { |
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3
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100
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9
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if (!defined $self->{'_subprotocol'}) { |
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2
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($self->{'_subprotocol'}) = grep { $_ eq $token } @{ $self->{'subprotocols'} }; |
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15
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2
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119
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} |
120
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} |
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} |
122
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else { |
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15
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56
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$self->_consume_generic_header($name => $value); |
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} |
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126
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22
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93
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return; |
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} |
128
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129
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#Send only those extensions that we’ve deduced the client can actually use. |
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sub _should_include_extension_in_headers { |
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0
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0
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0
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my ($self, $xtn) = @_; |
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133
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0
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0
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return $xtn->ok_to_use(); |
134
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} |
135
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136
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sub _encode_subprotocols { |
137
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2
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2
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7
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my ($self) = @_; |
138
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139
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2
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100
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16
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local $self->{'subprotocols'} = defined($self->{'_subprotocol'}) ? [ $self->{'_subprotocol'} ] : undef if $self->{'_no_use_legacy'}; |
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50
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140
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141
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2
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14
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return $self->SUPER::_encode_subprotocols(); |
142
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} |
143
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144
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sub _die_if_missing_headers { |
145
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4
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4
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11
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my ($self) = @_; |
146
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147
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4
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34
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my @needed = $self->_missing_generic_headers(); |
148
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149
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4
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100
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15
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push @needed, 'Sec-WebSocket-Version' if !$self->{'_version_ok'}; |
150
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4
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100
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push @needed, 'Sec-WebSocket-Key' if !$self->{'key'}; |
151
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152
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4
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if (@needed) { |
153
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1
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die Net::WebSocket::X->create('MissingHeaders', @needed); |
154
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} |
155
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156
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3
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11
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return; |
157
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} |
158
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159
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sub _create_header_lines { |
160
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2
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6
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my ($self) = @_; |
161
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162
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2
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9
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Call::Context::must_be_list(); |
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164
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return ( |
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2
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59
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'HTTP/1.1 101 Switching Protocols', |
166
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167
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#For now let’s assume no one wants any other Upgrade: |
168
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#or Connection: values than the ones WebSocket requires. |
169
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'Upgrade: websocket', |
170
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'Connection: Upgrade', |
171
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172
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'Sec-WebSocket-Accept: ' . $self->get_accept(), |
173
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174
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$self->_encode_subprotocols(), |
175
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176
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$self->_encode_extensions(), |
177
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); |
178
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} |
179
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180
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#---------------------------------------------------------------------- |
181
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182
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=head1 LEGACY INTERFACE: SYNOPSIS |
183
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184
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#...Parse the request’s headers yourself... |
185
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186
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my $hsk = Net::WebSocket::Handshake::Server->new( |
187
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188
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#base 64, gotten from request |
189
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key => '..', |
190
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191
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#optional - same as in non-legacy interface |
192
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subprotocols => [ 'echo', 'haha' ], |
193
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194
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#optional, instances of Net::WebSocket::Handshake::Extension |
195
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extensions => \@extension_objects, |
196
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); |
197
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198
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#Note the need to conclude the header text manually. |
199
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print $hsk->create_header_text() . "\x0d\x0a"; |
200
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201
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=cut |
202
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203
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*get_accept = __PACKAGE__->can('_get_accept'); |
204
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205
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1; |