94 lines
2.9 KiB
Ruby
94 lines
2.9 KiB
Ruby
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# -*- coding: utf-8 -*-
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#
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# = Cinch Link Info plugin
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# Inspects any links that are posted into a channel Cinch
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# is currently in and prints out the value of the title
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# and description meta tags, if any.
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#
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# == Dependencies
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# * Gem: nokogiri
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#
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# == Configuration
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# Add the following to your bot’s configure.do stanza:
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#
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# config.plugins.options[Cinch::LinkInfo] = {
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# :blacklist => [/\.xz$/],
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# :no_description => false,
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# }
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#
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# [blacklist]
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# If a URL matches any of the regular expressions defined
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# in this array, it will not be inspected. This plugin
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# alraedy ignores URLs ending in common image file
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# extensions, so you don’t have to specify .png, .jpeg,
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# etc.
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# [no_description]
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# Set this to true if you want Cinch to not print the
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# content of the Meta description tag.
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#
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# == Author
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# Marvin Gülker (Quintus)
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#
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# == License
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# A link info plugin for Cinch.
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# Copyright © 2012 Marvin Gülker
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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require "open-uri"
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require "nokogiri"
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# Plugin for inspecting links pasted into channels.
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class Cinch::LinkInfo
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include Cinch::Plugin
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# Default list of URL regexps to ignore.
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DEFAULT_BLACKLIST = [/\.png$/i, /\.jpe?g$/i, /\.bmp$/i, /\.gif$/i, /\.pdf$/i].freeze
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set :help, <<-HELP
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http[s]://...
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I’ll fire a GET request at any link I encounter, parse the HTML
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meta tags, and paste the result back into the channel.
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HELP
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match %r{(https?://.*?)(?:\s|$|,|\.\s|\.$)}, :use_prefix => false
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def execute(msg, url)
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blacklist = DEFAULT_BLACKLIST.dup
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blacklist.concat(config[:blacklist]) if config[:blacklist]
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return if blacklist.any?{|entry| url =~ entry}
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debug "URL matched: #{url}"
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html = Nokogiri::HTML(open(url))
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if node = html.at_xpath("html/head/title")
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msg.reply("Title: #{node.text}")
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end
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if !config[:no_description]
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node = html.at_xpath('html/head/meta[@name="description"]') || html.at_xpath('html/head/meta[@name="Description"]')
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if node
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if node[:content].chars.count > 255
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msg.reply("Description: #{node[:content].lines.first(3).join("").gsub("\n", " ")[0..255] + "..."}")
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else
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msg.reply("Description: #{node[:content]}")
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end
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end
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end
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rescue => e
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error "#{e.class.name}: #{e.message}"
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end
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end
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