[24bd860] | 1 | use warnings; |
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| 2 | use strict; |
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| 3 | |
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| 4 | =head1 NAME |
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| 5 | |
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| 6 | BarnOwl::Module::Facebook::Handle |
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| 7 | |
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| 8 | =head1 DESCRIPTION |
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| 9 | |
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| 10 | Contains everything needed to send and receive messages from Facebook |
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| 11 | |
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| 12 | =cut |
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| 13 | |
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| 14 | package BarnOwl::Module::Facebook::Handle; |
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| 15 | |
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| 16 | use Facebook::Graph; |
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[99f0a77] | 17 | |
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[44f585c] | 18 | use List::Util qw(reduce); |
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| 19 | |
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| 20 | eval { require Lingua::EN::Keywords; }; |
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| 21 | if ($@) { |
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| 22 | *keywords = sub { |
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| 23 | # stupidly pick the longest one, and only return one. |
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| 24 | my $sentence = shift; |
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[b49aaf8] | 25 | $sentence =~ s/[[:punct:]]+/ /g; |
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[44f585c] | 26 | my @words = split(' ', lc($sentence)); |
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| 27 | return () unless @words; |
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| 28 | return (reduce{ length($a) > length($b) ? $a : $b } @words,); |
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| 29 | }; |
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| 30 | } else { |
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| 31 | *keywords = \&Lingua::EN::Keywords::keywords; |
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| 32 | } |
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[99f0a77] | 33 | |
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[24bd860] | 34 | use JSON; |
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[63afb72] | 35 | use Date::Parse; |
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| 36 | use POSIX; |
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[01d186f] | 37 | use Ouch; |
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[24bd860] | 38 | |
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| 39 | use Scalar::Util qw(weaken); |
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| 40 | |
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| 41 | use BarnOwl; |
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| 42 | use BarnOwl::Message::Facebook; |
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| 43 | |
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| 44 | our $app_id = 235537266461636; # for application 'barnowl' |
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| 45 | |
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[63afb72] | 46 | # Unfortunately, Facebook does not offer a comment stream, in the same |
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| 47 | # way we can get a post stream using the news feed. This makes it a bit |
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| 48 | # difficult to de-duplicate comments we have already seen. We use a |
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| 49 | # simple heuristic to fix this: we check if the comment's time is dated |
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| 50 | # from before our last update, and don't re-post if it's dated before. |
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| 51 | # Be somewhat forgiving, since it's better to duplicate a post than to |
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| 52 | # drop one. Furthermore, we must use Facebook's idea of time, since the |
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| 53 | # server BarnOwl is running on may be desynchronized. So we need to |
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| 54 | # utilize Facebook's idea of time, not ours. We do this by looking at |
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| 55 | # all of the timestamps we see while processing an update, and take the |
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| 56 | # latest one and increment it by one second. |
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| 57 | # |
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| 58 | # What properties do we get with this setup? |
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| 59 | # |
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| 60 | # - We get comment updates only for the latest N posts on a news feed. |
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| 61 | # Any later ones, you have to use Facebook's usual mechanisms (e.g. |
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| 62 | # email notifications). |
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| 63 | # |
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| 64 | # - Processing a poll is relatively expensive, since we have to |
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| 65 | # iterate over N new posts. It might be worthwhile polling for new |
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| 66 | # comments less frequently than polling for new posts. |
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| 67 | |
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[24bd860] | 68 | sub new { |
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| 69 | my $class = shift; |
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| 70 | my $cfg = shift; |
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| 71 | |
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| 72 | my $self = { |
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| 73 | 'cfg' => $cfg, |
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| 74 | 'facebook' => undef, |
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[63afb72] | 75 | |
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[8b62088] | 76 | # Ideally this should be done using Facebook realtime updates, |
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| 77 | # but we can't assume that the BarnOwl lives on a publically |
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| 78 | # addressable server (XXX maybe we can setup an option for this.) |
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| 79 | 'friend_timer' => undef, |
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| 80 | |
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[63afb72] | 81 | # Initialized with our 'time', but will be synced to Facebook |
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[8b62088] | 82 | # soon enough. (Subtractive amount is just to preseed with some |
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[01d186f] | 83 | # values.) XXX Remove subtraction altogether. |
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| 84 | 'last_poll' => time - 60 * 60, |
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[24bd860] | 85 | 'timer' => undef, |
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[63afb72] | 86 | |
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| 87 | # Message polling not implemented yet |
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| 88 | #'last_message_poll' => time, |
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| 89 | #'message_timer' => undef, |
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| 90 | |
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[24bd860] | 91 | # yeah yeah, inelegant, I know. You can try using |
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| 92 | # $fb->authorize, but at time of writing (1.0300) they didn't support |
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| 93 | # the response_type parameter. |
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[01d186f] | 94 | # 'login_url' => 'https://www.facebook.com/dialog/oauth?client_id=235537266461636&scope=read_stream,read_mailbox,publish_stream,offline_access,read_friendlists,rsvp_event,user_events&redirect_uri=http://www.facebook.com/connect/login_success.html&response_type=token', |
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[24bd860] | 95 | # minified to fit in most terminal windows. |
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[01d186f] | 96 | # Be careful about updating these values, since BarnOwl will not |
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| 97 | # notice that it is missing necessary permissions until it |
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| 98 | # attempt to perform an operation which fails due to lack of |
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| 99 | # permissions. |
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| 100 | 'login_url' => 'http://goo.gl/rcM9s', |
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[63afb72] | 101 | |
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[99f0a77] | 102 | 'logged_in' => 0, |
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| 103 | |
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| 104 | # would need another hash for topic de-dup |
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| 105 | 'topics' => {}, |
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[8b62088] | 106 | |
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| 107 | # deduplicated map of names to user ids |
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| 108 | 'friends' => {}, |
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[24bd860] | 109 | }; |
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| 110 | |
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| 111 | bless($self, $class); |
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| 112 | |
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[a7ac83a] | 113 | $self->{facebook} = Facebook::Graph->new(app_id => $app_id); |
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| 114 | if (defined $self->{cfg}->{token}) { |
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[e1ed6f4] | 115 | $self->facebook_do_auth; |
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| 116 | } |
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[24bd860] | 117 | |
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| 118 | return $self; |
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| 119 | } |
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| 120 | |
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| 121 | =head2 sleep N |
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| 122 | |
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| 123 | Stop polling Facebook for N seconds. |
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| 124 | |
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| 125 | =cut |
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| 126 | |
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| 127 | sub sleep { |
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| 128 | my $self = shift; |
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| 129 | my $delay = shift; |
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| 130 | |
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| 131 | # prevent reference cycles |
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| 132 | my $weak = $self; |
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| 133 | weaken($weak); |
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| 134 | |
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| 135 | # Stop any existing timers. |
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[8b62088] | 136 | if (defined $self->{friend_timer}) { |
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| 137 | $self->{friend_timer}->stop; |
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| 138 | $self->{friend_timer} = undef; |
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| 139 | } |
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[24bd860] | 140 | if (defined $self->{timer}) { |
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| 141 | $self->{timer}->stop; |
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| 142 | $self->{timer} = undef; |
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| 143 | } |
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| 144 | if (defined $self->{message_timer}) { |
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| 145 | # XXX doesn't do anything right now |
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| 146 | $self->{message_timer}->stop; |
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| 147 | $self->{message_timer} = undef; |
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| 148 | } |
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| 149 | |
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[8b62088] | 150 | $self->{friend_timer} = BarnOwl::Timer->new({ |
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| 151 | name => "Facebook friend poll", |
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| 152 | after => $delay, |
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| 153 | interval => 60 * 60 * 24, |
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| 154 | cb => sub { $weak->poll_friends if $weak } |
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| 155 | }); |
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[24bd860] | 156 | $self->{timer} = BarnOwl::Timer->new({ |
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| 157 | name => "Facebook poll", |
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| 158 | after => $delay, |
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| 159 | interval => 90, |
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| 160 | cb => sub { $weak->poll_facebook if $weak } |
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| 161 | }); |
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| 162 | # XXX implement message polling |
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| 163 | } |
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| 164 | |
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[01d186f] | 165 | sub check_result { |
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| 166 | my $self = shift; |
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[7777ac2] | 167 | if (kiss "OAuthException") { |
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[01d186f] | 168 | $self->{logged_in} = 0; |
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| 169 | $self->facebook_do_auth; |
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| 170 | return 0; |
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| 171 | } elsif (hug) { |
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| 172 | my $code = $@->code; |
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| 173 | warn "Poll failed with $code: $@"; |
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| 174 | return 0; |
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| 175 | } |
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| 176 | return 1; |
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| 177 | } |
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| 178 | |
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[8b62088] | 179 | sub poll_friends { |
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| 180 | my $self = shift; |
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| 181 | |
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| 182 | return unless BarnOwl::getvar('facebook:poll') eq 'on'; |
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| 183 | return unless $self->{logged_in}; |
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| 184 | |
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[7777ac2] | 185 | $self->{facebook}->query->find('me/friends')->request(sub { |
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| 186 | my $response = shift; |
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| 187 | my $friends = eval { $response->as_hashref }; |
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| 188 | return unless $self->check_result; |
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| 189 | |
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| 190 | $self->{friends} = {}; |
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| 191 | |
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| 192 | for my $friend (@{$friends->{data}}) { |
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| 193 | if (defined $self->{friends}{$friend->{name}}) { |
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| 194 | # XXX We should try a little harder here, rather than just |
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| 195 | # tacking on a number. Ideally, we should be able to |
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| 196 | # calculate some extra piece of information that the user |
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| 197 | # needs to disambiguate between the two users. An old |
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| 198 | # version of Facebook used to disambiguate with your primary |
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| 199 | # network (so you might have Edward Yang (MIT) and Edward |
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| 200 | # Yang (Cambridge), the idea being that users in the same |
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| 201 | # network would probably have already disambiguated |
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| 202 | # themselves with middle names or nicknames. We no longer |
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| 203 | # get network information, since Facebook axed that |
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| 204 | # information, but the Education/Work fields may still be |
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| 205 | # a reasonable approximation (but which one do you pick?! |
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| 206 | # The most recent one.) Since getting this information |
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| 207 | # involves extra queries, there are also caching and |
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| 208 | # efficiency concerns (though hopefully you don't have too |
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| 209 | # many friends with the same name). Furthermore, accessing |
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| 210 | # this information requires a pretty hefty extra set of |
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| 211 | # permissions requests, which we don't currently ask for. |
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| 212 | # It may just be better to let users specify custom |
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| 213 | # aliases for Facebook users, which are added into this |
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| 214 | # hash. See also username support. |
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| 215 | warn "Duplicate friend name " . $friend->{name}; |
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| 216 | my $name = $friend->{name}; |
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| 217 | my $i = 2; |
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| 218 | while (defined $self->{friends}{$friend->{name} . ' ' . $i}) { $i++; } |
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| 219 | $self->{friends}{$friend->{name} . ' ' . $i} = $friend->{id}; |
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| 220 | } else { |
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| 221 | $self->{friends}{$friend->{name}} = $friend->{id}; |
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| 222 | } |
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[8b62088] | 223 | } |
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| 224 | |
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[7777ac2] | 225 | # XXX We should also have support for usernames, and not just real |
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| 226 | # names. However, since this data is not returned by the friends |
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| 227 | # query, it would require a rather expensive set of queries. We |
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| 228 | # might try to preserve old data, but all-in-all it's a bit |
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| 229 | # complicated. One possible way of fixing this is to construct a |
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| 230 | # custom FQL query that joins the friends table and the users table. |
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| 231 | }); |
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[8b62088] | 232 | } |
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| 233 | |
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[24bd860] | 234 | sub poll_facebook { |
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| 235 | my $self = shift; |
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| 236 | |
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| 237 | return unless BarnOwl::getvar('facebook:poll') eq 'on'; |
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| 238 | return unless $self->{logged_in}; |
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| 239 | |
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[63afb72] | 240 | # XXX Oh no! This blocks the user interface. Not good. |
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| 241 | # Ideally, we should have some worker thread for polling facebook. |
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| 242 | # But BarnOwl is probably not thread-safe >_< |
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[24bd860] | 243 | |
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[99f0a77] | 244 | my $old_topics = $self->{topics}; |
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| 245 | $self->{topics} = {}; |
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| 246 | |
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[7777ac2] | 247 | $self->{facebook} |
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| 248 | ->query |
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| 249 | ->from("my_news") |
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| 250 | # Not using this, because we want to pick up comment |
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| 251 | # updates. We need to manually de-duplicate, though. |
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| 252 | # ->where_since("@" . $self->{last_poll}) |
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| 253 | # Facebook doesn't actually give us that many results. |
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| 254 | # But it can't hurt to ask! |
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| 255 | ->limit_results(200) |
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| 256 | ->request(sub { |
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| 257 | |
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| 258 | my $updates = eval { shift->as_hashref }; |
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| 259 | return unless $self->check_result; |
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[77d1ef1] | 260 | |
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[7777ac2] | 261 | my $new_last_poll = $self->{last_poll}; |
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| 262 | for my $post (reverse @{$updates->{data}}) { |
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| 263 | # No app invites, thanks! (XXX make configurable) |
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| 264 | if ($post->{type} eq 'link' && $post->{application}) { |
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| 265 | next; |
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| 266 | } |
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[63afb72] | 267 | |
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[7777ac2] | 268 | # XXX Filtering out interest groups for now |
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| 269 | # A more reasonable strategy may be to show their |
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| 270 | # posts, but not the comments. |
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| 271 | if (defined $post->{from}{category}) { |
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| 272 | next; |
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| 273 | } |
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[65c2b3c] | 274 | |
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[7777ac2] | 275 | # There can be multiple recipients! Strange! Pick the first one. |
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| 276 | my $name = $post->{to}{data}[0]{name} || $post->{from}{name}; |
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| 277 | my $name_id = $post->{to}{data}[0]{id} || $post->{from}{id}; |
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| 278 | my $post_id = $post->{id}; |
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| 279 | |
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| 280 | my $topic; |
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| 281 | if (defined $old_topics->{$post_id}) { |
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| 282 | $topic = $old_topics->{$post_id}; |
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| 283 | $self->{topics}->{$post_id} = $topic; |
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| 284 | } else { |
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| 285 | my @keywords = keywords($post->{name} || $post->{message}); |
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| 286 | $topic = $keywords[0] || 'personal'; |
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| 287 | $topic =~ s/ /-/g; |
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| 288 | $self->{topics}->{$post_id} = $topic; |
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| 289 | } |
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[63afb72] | 290 | |
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[7777ac2] | 291 | # Only handle post if it's new |
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| 292 | my $created_time = str2time($post->{created_time}); |
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| 293 | if ($created_time >= $self->{last_poll}) { |
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| 294 | # XXX indexing is fragile |
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[63afb72] | 295 | my $msg = BarnOwl::Message->new( |
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| 296 | type => 'Facebook', |
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[7777ac2] | 297 | sender => $post->{from}{name}, |
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| 298 | sender_id => $post->{from}{id}, |
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[63afb72] | 299 | name => $name, |
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| 300 | name_id => $name_id, |
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| 301 | direction => 'in', |
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[7777ac2] | 302 | body => $self->format_body($post), |
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[01d186f] | 303 | post_id => $post_id, |
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| 304 | topic => $topic, |
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[7777ac2] | 305 | time => asctime(localtime $created_time), |
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| 306 | # XXX The intent is to get the 'Comment' link, which also |
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| 307 | # serves as a canonical link to the post. The {name} |
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| 308 | # field should equal 'Comment'. |
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| 309 | permalink => $post->{actions}[0]{link}, |
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[63afb72] | 310 | ); |
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| 311 | BarnOwl::queue_message($msg); |
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| 312 | } |
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[7777ac2] | 313 | |
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| 314 | # This will interleave times (they'll all be organized by parent |
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| 315 | # post), but since we don't expect too many updates between |
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| 316 | # polls this is pretty acceptable. |
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| 317 | my $updated_time = str2time($post->{updated_time}); |
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| 318 | if ($updated_time >= $self->{last_poll} && defined $post->{comments}{data}) { |
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| 319 | for my $comment (@{$post->{comments}{data}}) { |
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| 320 | my $comment_time = str2time($comment->{created_time}); |
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| 321 | if ($comment_time < $self->{last_poll}) { |
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| 322 | next; |
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| 323 | } |
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| 324 | my $msg = BarnOwl::Message->new( |
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| 325 | type => 'Facebook', |
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| 326 | sender => $comment->{from}{name}, |
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| 327 | sender_id => $comment->{from}{id}, |
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| 328 | name => $name, |
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| 329 | name_id => $name_id, |
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| 330 | direction => 'in', |
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| 331 | body => $comment->{message}, |
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| 332 | post_id => $post_id, |
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| 333 | topic => $topic, |
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| 334 | time => asctime(localtime $comment_time), |
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| 335 | permalink => "", |
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| 336 | ); |
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| 337 | BarnOwl::queue_message($msg); |
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| 338 | } |
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| 339 | } |
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| 340 | if ($updated_time + 1 > $new_last_poll) { |
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| 341 | $new_last_poll = $updated_time + 1; |
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| 342 | } |
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[63afb72] | 343 | } |
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[7777ac2] | 344 | # old_topics gets GC'd |
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[63afb72] | 345 | |
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[7777ac2] | 346 | $self->{last_poll} = $new_last_poll; |
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| 347 | }); |
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[24bd860] | 348 | } |
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| 349 | |
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| 350 | sub format_body { |
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| 351 | my $self = shift; |
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| 352 | |
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| 353 | my $post = shift; |
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| 354 | |
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| 355 | # XXX implement optional URL minification |
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| 356 | if ($post->{type} eq 'status') { |
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| 357 | return $post->{message}; |
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| 358 | } elsif ($post->{type} eq 'link' || $post->{type} eq 'video' || $post->{type} eq 'photo') { |
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| 359 | return $post->{name} |
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| 360 | . ($post->{caption} ? " (" . $post->{caption} . ")\n" : "\n") |
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| 361 | . $post->{link} |
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| 362 | . ($post->{description} ? "\n\n" . $post->{description} : "") |
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| 363 | . ($post->{message} ? "\n\n" . $post->{message} : ""); |
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| 364 | } else { |
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| 365 | return "(unknown post type " . $post->{type} . ")"; |
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| 366 | } |
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| 367 | } |
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| 368 | |
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[01d186f] | 369 | # Invariant: we don't become logged out between entering text field |
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| 370 | # and actually processing the request. XXX I don't think this actually |
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| 371 | # holds, but such a case would rarely happen. |
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| 372 | |
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[24bd860] | 373 | sub facebook { |
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| 374 | my $self = shift; |
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| 375 | |
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[8b62088] | 376 | my $user = shift; |
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[24bd860] | 377 | my $msg = shift; |
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| 378 | |
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[7777ac2] | 379 | my $cont = sub { $self->sleep(0); }; |
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| 380 | |
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[8b62088] | 381 | if (defined $user) { |
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| 382 | $user = $self->{friends}{$user} || $user; |
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[7777ac2] | 383 | $self->{facebook}->add_post($user)->set_message($msg)->publish($cont); |
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[8b62088] | 384 | } else { |
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[7777ac2] | 385 | $self->{facebook}->add_post->set_message($msg)->publish($cont); |
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[8b62088] | 386 | } |
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[24bd860] | 387 | } |
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| 388 | |
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| 389 | sub facebook_comment { |
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| 390 | my $self = shift; |
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| 391 | |
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[eb497a9] | 392 | my $post_id = shift; |
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[24bd860] | 393 | my $msg = shift; |
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| 394 | |
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[7777ac2] | 395 | $self->{facebook}->add_comment($post_id)->set_message($msg)->publish(sub { $self->sleep(0); }); |
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[24bd860] | 396 | } |
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| 397 | |
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| 398 | sub facebook_auth { |
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| 399 | my $self = shift; |
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| 400 | |
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| 401 | my $url = shift; |
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[01d186f] | 402 | |
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[e1ed6f4] | 403 | if (!defined $url) { |
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| 404 | $self->facebook_do_auth; |
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| 405 | return; |
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| 406 | } |
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| 407 | |
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[24bd860] | 408 | # http://www.facebook.com/connect/login_success.html#access_token=TOKEN&expires_in=0 |
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| 409 | $url =~ /access_token=([^&]+)/; # XXX Ew regex |
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| 410 | |
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[01d186f] | 411 | if (!defined $1) { |
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| 412 | BarnOwl::message("Invalid URL."); |
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| 413 | return; |
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| 414 | } |
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| 415 | |
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[24bd860] | 416 | $self->{cfg}->{token} = $1; |
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[7777ac2] | 417 | $self->facebook_do_auth(sub { |
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[24bd860] | 418 | my $raw_cfg = to_json($self->{cfg}); |
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| 419 | BarnOwl::admin_message('Facebook', "Add this as the contents of your ~/.owl/facebook file:\n$raw_cfg"); |
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[7777ac2] | 420 | }); |
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| 421 | return; |
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[24bd860] | 422 | } |
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| 423 | |
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| 424 | sub facebook_do_auth { |
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| 425 | my $self = shift; |
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[7777ac2] | 426 | my $success = shift || sub {}; |
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[a7ac83a] | 427 | if (!defined $self->{cfg}->{token}) { |
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[24bd860] | 428 | BarnOwl::admin_message('Facebook', "Login to Facebook at ".$self->{login_url} |
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[01d186f] | 429 | . "\nand run command ':facebook-auth URL' with the URL you are redirected to." |
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[d9c6631] | 430 | . "\n\nWhat does BarnOwl use these permissions for? As a desktop" |
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[01d186f] | 431 | . "\nmessaging application, we need persistent read/write access to your" |
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| 432 | . "\nnews feed and your inbox. Other permissions are for pending" |
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| 433 | . "\nfeatures: we intend on adding support for event streaming, RSVP," |
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| 434 | . "\nand BarnOwl filtering on friend lists." |
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| 435 | ); |
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[24bd860] | 436 | return 0; |
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| 437 | } |
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| 438 | $self->{facebook}->access_token($self->{cfg}->{token}); |
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| 439 | # Do a quick check to see if things are working |
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[7777ac2] | 440 | $self->{facebook}->query()->find('me')->select_fields('name')->request(sub { |
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| 441 | my $result = eval { shift->as_hashref }; |
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| 442 | if ($@) { |
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| 443 | BarnOwl::admin_message('Facebook', "Failed to authenticate with '$@'!" |
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| 444 | . "\nLogin to Facebook at ".$self->{login_url} |
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| 445 | . "\nand run command ':facebook-auth URL' with the URL you are redirected to."); |
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| 446 | } else { |
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| 447 | my $name = $result->{'name'}; |
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| 448 | BarnOwl::admin_message('Facebook', "Successfully logged in to Facebook as $name!"); |
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| 449 | $self->{logged_in} = 1; |
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| 450 | $self->sleep(0); # start polling |
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| 451 | $success->(); |
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| 452 | } |
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| 453 | }); |
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[24bd860] | 454 | } |
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| 455 | |
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| 456 | 1; |
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