From fc449da24ace2ba9ec5304afaae579d9fe55e967 Mon Sep 17 00:00:00 2001
From: Ralf Ertzinger <ralf@skytale.net>
Date: Tue, 30 Apr 2013 15:49:09 +0200
Subject: [PATCH] Add libvideosite.pm

---
 libvideosite.pm | 1047 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 1047 insertions(+)
 create mode 100644 libvideosite.pm

diff --git a/libvideosite.pm b/libvideosite.pm
new file mode 100644
index 0000000..4920801
--- /dev/null
+++ b/libvideosite.pm
@@ -0,0 +1,1047 @@
+package libvideosite;
+require Exporter;
+
+use vars qw(@ISA @EXPORT_OK);
+use File::Spec;
+use Module::Load;
+use LWP::UserAgent;
+use Data::Dumper;
+use File::Basename;
+use Cwd qw(realpath);
+use strict;
+
+@ISA = qw(Exporter);
+@EXPORT_OK = qw(init register_api check_for_link);
+
+my @outputstack;
+my $outputprefix;
+my $debug = 0;
+my @grabbers;
+my @getters;
+my $getter;
+my %builtin_config = ();
+our $error;
+
+#
+# The default config. These values will be set in the config
+# if they do not exist already.
+#
+my $defaultconfig = {
+    'getter' => 'filegetter',
+    'mode' => 'download',
+    'active-connectors' => 'direct',
+    'defined-connectors' => 'direct',
+    'connectors' => {
+        'direct' => {
+            'name' => 'direct',
+            '_immutable' => '1',
+            'schemas' => {},
+        }
+    }
+};
+
+#
+# List of known commands and handlers
+#
+my $videosite_commands = {
+    'save' => sub {
+        _cmd_save();
+    },
+
+    'set' => sub {
+        _cmd_set(@_);
+    },
+    
+    'show' => sub {
+        _cmd_show(@_);
+    },
+
+    'help' => sub {
+        _cmd_help(@_);
+    },
+
+    'getter' => sub {
+        _cmd_getter(@_);
+    },
+
+    'enable' => sub {
+        _cmd_enable(@_);
+    },
+
+    'disable' => sub {
+        _cmd_disable(@_);
+    },
+
+    'reload' => sub {
+        init();
+    },
+
+    'mode' => sub {
+        _cmd_mode(@_);
+    },
+
+    'connector' => sub {
+        _cmd_connector(@_);
+    },
+
+    'debug' => sub {
+        $debug = 1;
+        foreach (@grabbers, @getters) {
+            $_->setdebug(1);
+        }
+        _io('Enabled debugging');
+    },
+
+    'nodebug' => sub {
+        $debug = 0;
+        foreach (@grabbers, @getters) {
+            $_->setdebug(0);
+        }
+        _io('Disabled debugging');
+    },
+};
+
+#
+# This is a list of default values for the remote API. These
+# are used if the values are not registered by the library user.
+#
+my $remote_api = {
+    io => sub { print @_, "\n" },
+    config_init => \&_builtin_config_init,
+    config_get => \&_builtin_config_get,
+    config_set => \&_builtin_config_set,
+    config_has => \&_builtin_config_has,
+    config_save => \&_builtin_config_save,
+    config_del => \&_builtin_config_del,
+    color => sub { return '' },
+    module_path => sub { return dirname(realpath($0)) },
+    quote => sub { return $_ },
+};
+
+#
+# Output a string on the client.
+# Works like (s)printf in that it takes a format string and a list of
+# values to be replaced. Undefined values will be printed as '(undef)'
+#
+# All parameters (except for the format string itself) will be quoted
+# using the client specific quote function
+#
+sub _io {
+    my @text = @_;
+    my $format;
+
+    # This will define the outputprefix once, so we don't have
+    # do do this every time.
+    $outputprefix //= sprintf("%svideosite: %s",
+        $remote_api->{color}->('magenta'),
+        $remote_api->{color}->());
+    $format = $outputprefix . shift(@text);
+
+    #
+    # The format string is assumed to be appropriately quoted.
+    # Quote the rest of the text, replacing undefined strings by (undef)
+    #
+    @text = map { defined($_)?$remote_api->{quote}->($_):'(undef)' } @text;
+
+    $outputstack[0]->(sprintf($format, @text));
+}
+
+#
+# Recursively walk through a hash-of-hashes, calling the given function
+# for each found leaf with the path to the leaf
+#
+sub _recursive_hash_walk {
+    my $hash = shift;
+    my $callback = shift;
+    my @path = @_;
+
+    foreach (keys(%{$hash})) {
+        if (ref($hash->{$_}) eq 'HASH') {
+            _recursive_hash_walk($hash->{$_}, $callback, @path, $_);
+        } else {
+            $callback->([@path, $_], $hash->{$_});
+        }
+    }
+}
+
+#
+# Return the color code for the given foreground/background color
+# pair. Both can be undef, which means "default"
+#
+sub _colorpair {
+    my ($fg, $bg) = @_;
+
+    return $remote_api->{color}->($fg, $bg);
+}
+
+#
+# Sets the given config item if it is not set already
+#
+sub _init_config_item {
+    my $path = shift;
+    my $value = shift;
+
+    unless($remote_api->{config_has}->($path)) {
+        $remote_api->{config_set}->($path, $value);
+    }
+}
+
+#
+# Print a message if debug is enabled
+#
+sub _debug {
+    if ($debug) {
+        _io(@_);
+    }
+}
+
+#
+# Load a list of modules matching a pattern from a given directory.
+#
+sub _ploader {
+
+    my $dir = shift;
+    my $pattern = shift;
+    my $type = shift;
+    my @list;
+    my $p;
+    my $g;
+    my @g = ();
+
+    opendir(D, $dir) || return ();
+    @list = grep {/$pattern/ && -f File::Spec->catfile($dir, $_) } readdir(D);
+    closedir(D);
+
+    foreach $p (@list) {
+        _debug("Trying to load $p:");
+        $p =~ s/\.pm$//;
+        eval {
+            load "videosite::$p";
+        };
+        if ($@) {
+            _io("Failed to load plugin: $@");
+            next;
+        }
+
+        eval {
+            $g = "videosite::$p"->new();
+        };
+        if ($@) {
+            _io("Failed to instanciate: $@");
+            delete($INC{$p});
+            next;
+        }
+
+        _debug("found $g->{'TYPE'} $g->{'NAME'}");
+        if ($type eq $g->{'TYPE'}) {
+            push(@g, $g);
+            $g->register_api({
+                io => \&_io,
+                connectors => sub { return _connectorlist('active-connectors') },
+                config_get => \&_config_get,
+                config_set => \&_config_set,
+                config_has => \&_config_has,
+            });
+            $g->setdebug($debug);
+        } else {
+            _io('%s has wrong type (got %s, expected %s)', $p, $g->{'TYPE'}, $type);
+            delete($INC{$p});
+        }
+    }
+
+    _debug("Loaded %d plugins", $#g+1);
+    
+    return @g;
+}
+
+#
+# Populate the @grabbers and @getters lists from the given
+# directory
+#
+sub _load_modules($) {
+
+    my $path = shift;
+
+    foreach (keys(%INC)) {
+        if ($INC{$_} =~ m|^$path|) {
+            _debug("Removing %s from \$INC", $_);
+            delete($INC{$_});
+        }
+    }
+    @grabbers = _ploader($path, '.*Grabber\.pm$', 'grabber');
+    @getters = _ploader($path, '.*Getter\.pm$', 'getter');
+}
+
+#
+# Wrapper functions for config management to put in
+# debugging
+#
+sub _config_get {
+    my $path = shift;
+    my $value;
+
+    $value = $remote_api->{config_get}->($path);
+    _debug("config: getting %s=%s", join('.', @{$path}), $value);
+
+    return $value;
+}
+
+sub _config_set {
+    my $path = shift;
+    my $value = shift;
+
+    _debug("config: setting %s=%s", join('.', @{$path}), $value);
+    return $remote_api->{config_set}->($path, $value);
+}
+
+sub _config_has {
+    my $path = shift;
+    my $b;
+
+    $b = $remote_api->{config_has}->($path);
+    _debug("config: testing %s (%s)", join('.', @{$path}), $b?'true':'false');
+
+    return $b;
+}
+
+#
+# The _config_list_* are helper functions taking a path to a comma separated
+# string. The string is interpreted as a list and the action performed
+# on it, storing back the modified version
+#
+
+#
+# Add an item to the list, checking for duplicates
+#
+sub _config_list_add {
+    my $path = shift;
+    my $item = shift;
+    my @c;
+
+    if (_config_has($path)) {
+        @c = split(/\s*,\s*/, _config_get($path));
+    } else {
+        @c = ();
+    }
+
+    _debug("Adding %s to list %s", $item, join(".", $path));
+    unless(grep { $_ eq $item } @c) {
+        push(@c, $item);
+    };
+
+    _config_set($path, join(',', @c));
+}
+
+# 
+# Remove an item from the list
+#
+sub _config_list_del {
+    my $path = shift;
+    my $item = shift;
+    my @c;
+
+    unless(_config_has($path)) {
+        return;
+    }
+
+    _debug("Removing %s from list %s", $item, join('.', $path));
+    @c = map { $item ne $_ } split(/\s*,\s*/, _config_get($path));
+
+    _config_set($path, join('.', @c));
+}
+
+#
+# Return true if the item contains the given list, false otherwise
+#
+sub _config_list_has {
+    my $path = shift;
+    my $item = shift;
+
+    unless(_config_has($path)) {
+        return 0;
+    }
+
+    _debug("Checking for %s in list %s",  $item, join('.', $path));
+
+    return grep { $item eq $_ } split(/\s*,\s*/, _config_get($path));
+}
+
+#
+# Replace a list with the given items
+#
+sub _config_list_set {
+    my $path = shift;
+
+    _debug("Replacing %s with (%s)", join('.', $path), join(",", @_));
+
+    _config_set($path, join(',', @_));
+}
+
+#
+# Return the list of currently active connectors, in the configured
+# order
+#
+sub _connectorlist {
+    my $key = shift;
+    my @c;
+
+    foreach(split(/,/, _config_get([$key]))) {
+        push(@c, _unserialize_connector_hash($_));
+    }
+
+    return @c;
+}
+
+#
+# Convert a connector hash from it's config structure back to a perl
+# hash
+#
+sub _unserialize_connector_hash {
+    my $name = shift;
+    my $connector = {};
+
+    if (_config_has(['connectors', $name, 'name'])) {
+        $connector->{name} = _config_get(['connectors', $name, 'name']);
+        $connector->{schemas} = {};
+        foreach ('http', 'https') {
+            if (_config_has(['connectors', $name, 'schemas', $_])) {
+                $connector->{schemas}->{$_} = _config_get(['connectors', $name, 'schemas', $_]);
+            }
+        }
+    }
+
+    _debug("Returning connector %s: %s", $name, Dumper($connector));
+
+    return $connector;
+}
+
+#
+# Push a new output function on the IO stack.
+#
+sub _push_output {
+    unshift(@outputstack, shift);
+}
+
+#
+# Pop the topmost output function from the stack, leaving
+# at least one function on it.
+#
+sub _pop_output {
+    if (scalar(@outputstack) > 0) {
+        shift(@outputstack);
+    }
+}
+
+#
+# Takes a string and replaces commonly used URL shorteners recursively,
+# up to 10 levels deep
+#
+sub _expand_url_shortener {
+    my $s = shift;
+    my $os = '';
+    my @urlshortener = (
+        'is\.gd/[[:alnum:]]+',
+        'otf\.me/[[:alnum:]]+',
+        'hel\.me/[[:alnum:]]+',
+        '7ax\.de/[[:alnum:]]+',
+        'ow\.ly/[[:alnum:]]+',
+        'j\.mp/[[:alnum:]]+',
+        'bit\.ly/[[:alnum:]]+',
+        'tinyurl\.com/[[:alnum:]]+',
+        'pop\.is/[[:alnum:]]+',
+        'post\.ly/[[:alnum:]]+',
+        '1\.ly/[[:alnum:]]+',
+        '2\.ly/[[:alnum:]]+',
+        't\.co/[[:alnum:]]+',
+        'shar\.es/[[:alnum:]]+',
+        'goo\.gl/[[:alnum:]]+',
+        );
+    my $ua = LWP::UserAgent->new(agent => 'Mozilla', max_redirect => 0, timeout => 5);
+    my $i = 10;
+
+    OUTER: while (($os ne $s) and ($i > 0)) {
+        study($s);
+        $os = $s;
+        $i--;
+
+        foreach my $pattern (@urlshortener) {
+            my $p = "https?:\/\/" . $pattern;
+
+            _debug("Matching %s against %s", $p, $s);
+            if ($s =~ m|($p)|) {
+                my $matched = $1;
+                my $res;
+
+                _debug("Found %s", $matched);
+                $res = $ua->head($matched);
+                if ($res->is_redirect()) {
+                    my $new = $res->headers()->header("Location");
+
+                    _debug("Replacing %s with %s", $matched, $new);
+                    $s =~ s/$matched/$new/;
+                    next OUTER;
+                } else {
+                    _debug("Error resolving %s", $matched);
+                }
+            }
+        }
+    }
+
+    if ($i == 0) {
+        _debug("Loop terminated by counter");
+    }
+
+    _debug("Final string: %s", $s);
+
+    return $s;
+}
+
+#
+# Save the config to durable storage
+#
+sub _cmd_save {
+    $remote_api->{config_save}->();
+}
+
+#
+# Set a configuration element
+#
+sub _cmd_set {
+    my $target = shift;
+    my $key = shift;
+    my $val = shift;
+    my $p;
+
+    foreach $p (@getters, @grabbers) {
+        if ($p->{'NAME'} eq $target) {
+            $p->setval($key, $val);
+            return;
+        }
+    }
+    _io('No such module');
+}
+
+
+#
+# Enable a given module
+#
+sub _cmd_enable {
+    my $target = shift;
+    my $p;
+
+    foreach $p (@grabbers) {
+        if ($p->{'NAME'} eq $target) {
+            $p->enable();
+            return;
+        }
+    }
+    _io('No such module');
+}
+
+#
+# Disable given module
+#
+sub _cmd_disable {
+    my $target = shift;
+    my $p;
+
+    foreach $p (@grabbers) {
+        if ($p->{'NAME'} eq $target) {
+            $p->disable();
+            return;
+        }
+    }
+    _io('No such module');
+}
+
+#
+# Show settings for modules
+#
+sub _cmd_show {
+    my $target = shift;
+    my $p;
+    my $e;
+
+    if (defined($target)) {
+        foreach $p (@getters, @grabbers) {
+            if ($p->{'NAME'} eq $target) {
+                _io($p->getconfstr());
+                return;
+            }
+        }
+        _io('No such module');
+    } else {
+        _io('Loaded grabbers (* denotes enabled modules):');
+        foreach $p (@grabbers) {
+            $e = $p->_getval('enabled');
+            _io(' %s%s', $p->{'NAME'}, $e?'*':'');
+        };
+
+        _io('Loaded getters:');
+        foreach $p (@getters) {
+            _io(' %s', $p->{'NAME'});
+        };
+    }
+}
+
+#
+# Show help for the commands
+#
+sub _cmd_help {
+    my $target = shift;
+    my $p;
+
+    if (defined($target)) {
+        foreach $p (@getters, @grabbers) {
+            if ($p->{'NAME'} eq $target) {
+                _io($p->gethelpstr());
+                return;
+            }
+        }
+        _io('No such module');
+    } else {
+        _io(<<'EOT');
+Supported commands:
+ save: save the current configuration
+ help [modulename]: display this help, or module specific help
+ show [modulename]: show loaded modules, or the current parameters of a module
+ set modulename parameter value: set a module parameter to a new value
+ getter [modulename]: display or set the getter to use
+ enable [modulename]: enable the usage of this module (grabbers only)
+ disable [modulename]: disable the usage of this module (grabbers only)
+ reload: reload all modules (this is somewhat experimental)
+ mode [modename]: display or set the operation mode (download/display)
+ connector [subcommand]: manage connectors (proxies)
+ debug: enable debugging messages
+ nodebug: disable debugging messages
+EOT
+    }
+}
+
+#
+# Set the getter to use
+#
+sub _cmd_getter {
+    my $target = shift;
+    my $p;
+
+    if (defined($target)) {
+        foreach $p (@getters) {
+            if ($p->{'NAME'} eq $target) {
+                $getter = $p;
+                _config_set(['getter'], $target);
+                _io("Getter changed to %s", $target);
+                return;
+            }
+        }
+        _io('No such getter');
+    } else {
+        _io('Current getter: %s', _config_get(['getter']));
+    }
+}
+
+#
+# Show/set the working mode
+#
+sub _cmd_mode {
+    my $mode = shift;
+
+    if (defined($mode)) {
+        $mode = lc($mode);
+        if (('download' eq $mode) or ('display' eq $mode)) {
+            _config_set(['mode'], $mode);
+            _io('Now using %s mode', $mode);
+        } else {
+            _io('Invalid mode: %s', $mode);
+        }
+    } else {
+        _io('Current mode: %s', _config_get(['mode']));
+    }
+}
+
+
+#
+# Manage the connectors
+#
+sub _cmd_connector {
+    my $subcmd = shift;
+    my $c;
+
+    unless(defined($subcmd)) {
+        $subcmd = "help";
+    }
+
+    $subcmd = lc($subcmd);
+
+    if ($subcmd eq 'list') {
+        _io("Defined connectors");
+        foreach $c (_connectorlist('defined-connectors')) {
+            _io($c->{name});
+            my $schemas = $c->{schemas};
+            if (scalar(keys(%{$schemas})) == 0) {
+                _io(" No schemas defined");
+            } else {
+                foreach (keys(%{$schemas})) {
+                    _io(' %s: %s', $_, $schemas->{$_});
+                }
+            }
+        }
+
+        _io();
+        _io("Selected connectors: %s", _config_get(['active-connectors']));
+    } elsif ($subcmd eq 'add') {
+        my ($name) = @_;
+
+        unless(defined($name)) {
+            _io("No name given");
+            return;
+        }
+
+        $name = lc($name);
+
+        if (_config_list_has(['defined-connectors'], $name)) {
+            _io("Connector already exists");
+            return;
+        }
+
+        _config_set(['connectors', $name, 'name'], $name);
+        _config_list_add(['defined-connectors'], $name);
+    } elsif ($subcmd eq 'del') {
+        my ($name) = @_;
+        my @dcon;
+
+        unless(defined($name)) {
+            _io("No name given");
+            return;
+        }
+
+        unless (_config_list_has(['defined-connectors'])) {
+            _io("Connector does not exist");
+            return;
+        }
+
+        if (_config_has(['connectors', $name, '_immutable'])) {
+            _io("Connector cannot be removed");
+            return;
+        }
+
+        # Remove from list of active connectors
+        _config_list_del(['defined-connectors'], $name);
+        _config_list_del(['active-connectors'], $name);
+
+        _config_del(['connectors', $name, 'name']);
+        _config_del(['connectors', $name, '_immutable']);
+        _config_del(['connectors', $name, 'schemas', 'http']);
+        _config_del(['connectors', $name, 'schemas', 'https']);
+
+        @dcon = split(/,/, _config_get(['active-connectors']));
+
+        if (scalar(@dcon) == 0) {
+            _io("List of selected connectors is empty, resetting to direct");
+            _config_list_add(['active-connectors', 'direct']);
+        }
+    } elsif ($subcmd eq 'addschema') {
+        my ($conn, $schema, $proxy) = @_;
+
+        unless(defined($conn)) {
+            _io("No connector name given");
+            return;
+        }
+
+        unless(defined($schema)) {
+            _io("No schema given");
+            return;
+        }
+
+        unless(defined($proxy)) {
+            _io("No proxy given");
+            return;
+        }
+
+        $conn = lc($conn);
+        unless(_config_list_has(['defined-connectors'], $conn)) {
+            _io("Connector does not exist");
+            return;
+        }
+
+        if (_config_has(['connectors', $conn, '_immutable'])) {
+            _io("Connector cannot be modified");
+            return;
+        }
+
+        $schema = lc($schema);
+        _config_set(['connectors', $conn, 'schemas', $schema], $proxy);
+    } elsif ($subcmd eq 'delschema') {
+        my ($conn, $schema) = @_;
+
+        unless(defined($conn)) {
+            _io("No connector name given");
+            return;
+        }
+
+        unless(defined($schema)) {
+            _io("No schema given");
+            return;
+        }
+
+        $conn = lc($conn);
+        unless(_config_list_has(['defined-connectors'], $conn)) {
+            _io("Connector does not exist");
+            return;
+        }
+
+        $schema = lc($schema);
+        _config_del(['connectors', $conn, 'schemas', $schema]);
+    } elsif ($subcmd eq 'select') {
+        my @connlist = map { lc } @_;
+
+        if (scalar(@connlist) == 0) {
+            _io("No connectors given");
+            return;
+        }
+
+        foreach (@connlist) {
+            unless(_config_list_has(['defined-connectors'], $_)) {
+                _io("Connector %s does not exist", $_);
+                return;
+            }
+        }
+
+        _config_list_set(['active-connectors'], @connlist);
+    } else {
+        _io("connector [list|add|del|addschema|delschema|help] <options>");
+        _io(" help: Show this help");
+        _io(" list: List the defined connectors");
+        _io(" add <name>: Add a connector with name <name>");
+        _io(" del <name>: Delete the connector with name <name>");
+        _io(" addschema <name> <schema> <proxy>: Add proxy to connector for the given schema");
+        _io(" delschema <name> <schema>: Remove the schema from the connector");
+        _io(" select <name> [<name>...]: Select the connectors to use");
+    }
+}
+
+#
+# Return the list of loaded grabbers.
+# This is used by the test programs, and is not meant to be
+# used in general.
+#
+sub _grabbers {
+    return @grabbers;
+}
+
+#
+# ==============================================
+# Builtin config handling functions
+# These are used if the library used does not
+# register it's own config_* handlers
+# ==============================================
+#
+sub _builtin_config_init {
+}
+
+sub _builtin_config_get {
+    return $builtin_config{join(".", @{$_[0]})};
+}
+
+sub _builtin_config_set {
+    $builtin_config{join(".", @{$_[0]})} = $_[1];
+}
+
+sub _builtin_config_has {
+    return exists($builtin_config{join(".", @{$_[0]})});
+}
+
+sub _builtin_config_save {
+}
+
+sub _builtin_config_del {
+    delete($builtin_config{join(".", @{$_[0]})});
+}
+
+#
+# ==============================================
+# From this point on publicly callable functions
+# ==============================================
+#
+
+
+#
+# Initialization function for the library
+# Actually not the first thing to be called, it expects an API
+# has (register_api) to be registered first
+#
+sub init {
+    unless($remote_api) {
+        $error = "No API set";
+        return 0;
+    }
+
+    # Initialize configuration data
+    $remote_api->{config_init}->();
+
+    # Check/create default values, if they do not exist
+    _recursive_hash_walk($defaultconfig, \&_init_config_item);
+
+    # Load modules
+    _load_modules(File::Spec->catfile($remote_api->{module_path}->(), 'videosite'));
+
+    unless (@grabbers && @getters) {
+        _io('No grabbers or no getters found, can not proceed.');
+        return 0;
+    }
+
+    # Set the getter
+    $getter = $getters[0];
+    foreach my $p (@getters) {
+        if (_config_get(['getter']) eq $p->{'NAME'}) {
+            $getter = $p;
+        }
+    }
+    _debug('Selected %s as getter', $getter->{'NAME'});
+    _config_set(['getter'], $getter->{'NAME'});
+
+    # Done.
+    _io('initialized successfully');
+    return 1;
+}
+
+#
+# Register a remote API. This API contains a basic output function (used
+# when no window specific function is available), some config functions
+# and a color code function.
+#
+sub register_api {
+    my $a = shift;
+    my @config_functions = qw(config_init config_set config_get config_has config_save config_del);
+    my $c;
+    my @missing;
+
+    unless(defined($a)) {
+        die("No API given");
+    }
+
+    #
+    # The config_* handlers are special in that they either all have
+    # provided by the user, or none. In the latter case builtin
+    # handlers will be used, but the config will not persist.
+    #
+    $c = 0;
+    foreach (@config_functions) {
+        if (exists($a->{$_})) {
+            $c++;
+        } else {
+            push(@missing, $_);
+        }
+    }
+
+    unless (($c == 0) or ($c == scalar(@config_functions))) {
+        $error = sprintf("Missing config function: %s", $missing[0]);
+        return 0;
+    }
+
+    foreach (keys(%{$a})) {
+        if (ref($a->{$_}) ne 'CODE') {
+            $error = sprintf("API handler %s is not a subroutine reference", $_);
+        }
+        $remote_api->{$_} = $a->{$_};
+    }
+
+    if (exists($a->{_debug})) {
+        $debug = $a->{_debug}->();
+    }
+
+    @outputstack = ($remote_api->{'io'});
+
+    return 1;
+}
+
+#
+# Check a message for useable links
+#
+sub check_for_link {
+    my $event = shift;
+    my $message = $event->{message};
+    my $g;
+    my $m;
+    my $p;
+
+
+    # Look if we should ignore this line
+    if ($message =~ m,(?:\s|^)/nosave(?:\s|$),) {
+        return;
+    }
+
+    _push_output($event->{ewpf});
+    $message = _expand_url_shortener($message);
+
+    study($message);
+
+    # Offer the message to all Grabbers in turn
+    GRABBER: foreach $g (@grabbers) {
+        ($m, $p) = $g->get($message);
+        while (defined($m)) {
+            _debug('Metadata: %s', Dumper($m));
+            if (exists($remote_api->{link_callback})) {
+                $remote_api->{link_callback}->($m);
+            }
+            if ('download' eq _config_get(['mode'])) {
+                _io(
+                    sprintf('%s>>> %sSaving %s%%s%s %s%%s',
+                        $remote_api->{color}->('*red'),
+                        $remote_api->{color}->(),
+                        $remote_api->{color}->('*yellow'),
+                        $remote_api->{color}->(),
+                        $remote_api->{color}->('*green'),
+                    ),
+                    $m->{'SOURCE'},
+                    $m->{'TITLE'}
+                );
+                unless($getter->get($m)) {
+                    _io(sprintf('%s>>> FAILED', $remote_api->{color}->('*red')));
+                }
+            } elsif ('display' eq _config_get(['mode'])) {
+                _io(
+                    sprintf('%s>>> %sSaw %s%%s%s %s%%s',
+                        $remote_api->{color}->('*magenta'),
+                        $remote_api->{color}->(),
+                        $remote_api->{color}->('*yellow'),
+                        $remote_api->{color}->(),
+                        $remote_api->{color}->('*green')
+                    ),
+                    $m->{'SOURCE'},
+                    $m->{'TITLE'}
+                );
+            } else {
+                _io(sprintf('%s>>> Invalid operation mode', $remote_api->{color}->('*red')));
+            }
+
+            # Remove the matched part from the message and try again (there may be
+            # more!)
+            $message =~ s/$p//;
+            study($message);
+            last GRABBER if ($message =~ /^\s*$/);
+
+            ($m, $p) = $g->get($message);
+        }
+    }
+
+    _pop_output();
+}
+
+#
+# Handle a videosite command (/videosite ...) entered in the client
+#
+sub handle_command {
+    my $event = shift;
+    my ($cmd, @params) = split(/\s+/, $event->{message});
+
+    _push_output($event->{ewpf});
+
+    if (exists($videosite_commands->{$cmd})) {
+        $videosite_commands->{$cmd}->(@params);
+    }
+
+    _pop_output();
+}
+
+1;
-- 
1.8.3.1