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+# vi:et:sw=2
+# webhook plugin -- webservice plugin to support webhooks from common repository services
+# (e.g. GitHub, GitLab, Gitea) and announce changes on IRC
+# Most of the processing is done through two (sets of) filters:
+# * webhook host filters take the JSON sent from the hosting server,
+# and extract pertinent information (repository name, commit author, etc)
+# * webhook output filters take the DataStream produced by the webhook host filter,
+# and turn it into an IRC message to be sent by PRIVMSG or NOTICE based on the
+# webhook.announce_method configuration
+# The reason for this two-tier filtering is to allow the same output filters
+# to be fed data from different (potentially unknown) hosting services.
+
+require 'json'
+
+class WebHookPlugin < Plugin
+ include WebPlugin
+
+ Config.register Config::EnumValue.new('webhook.announce_method',
+ :values => ['say', 'notice'],
+ :default => 'say',
+ :desc => "Whether to send a message or notice when announcing new GitHub actions.")
+
+ # Auxiliary method used to collect two lines for output filters,
+ # running substitutions against DataStream _s_ optionally joined
+ # with hash _h_.
+ #
+ # TODO this was ripped from rss.rb considering moving it to the DataStream
+ # interface or something like that
+ #
+ # For substitutions, *_wrap keys can be used to alter the content of
+ # other nonempty keys. If the value of *_wrap is a String, it will be
+ # put before and after the corresponding key; if it's an Array, the first
+ # and second elements will be used for wrapping; if it's nil, no wrapping
+ # will be done (useful to override a default wrapping).
+ #
+ # For example:
+ # :handle_wrap => '::'::
+ # will wrap s[:handle] by prefixing and postfixing it with '::'
+ # :date_wrap => [nil, ' :: ']::
+ # will put ' :: ' after s[:date]
+ def make_stream(line1, line2, s, h={})
+ ss = s.merge(h)
+ subs = {}
+ wraps = {}
+ ss.each do |k, v|
+ kk = k.to_s.chomp!('_wrap')
+ if kk
+ nk = kk.intern
+ case v
+ when String
+ wraps[nk] = ss[nk].wrap_nonempty(v, v)
+ when Array
+ wraps[nk] = ss[nk].wrap_nonempty(*v)
+ when nil
+ # do nothing
+ else
+ warning "ignoring #{v.inspect} wrapping of unknown class"
+ end unless ss[nk].nil?
+ else
+ subs[k] = v
+ end
+ end
+ subs.merge! wraps
+ DataStream.new([line1, line2].compact.join("\n") % subs, ss)
+ end
+
+
+ # Auxiliary method used to define rss output filters
+ def webhook_host_filter(key, &block)
+ @bot.register_filter(key, @hostkey, &block)
+ end
+
+ def webhook_out_filter(key, &block)
+ @bot.register_filter(key, @outkey, &block)
+ end
+
+ # Define the default webhook host and output filters, and load custom ones.
+ # Custom filters are looked for in the plugin's default filter locations,
+ # and in webhook/filters.rb
+ #
+ # Preferably, the webhook_host_filter and webhook_out_filter methods should be used in these files, e.g.:
+ # webhook_filter :my_output do |s|
+ # line1 = "%{repo} and some %{author} info"
+ # make_stream(line1, nil, s)
+ # end
+ # to define the new filter 'my_output'.
+ #
+ # The datastream passed as input to the host filters has two keys:
+ # payload::
+ # the hash representing the JSON payload
+ # request::
+ # the HTTPRequest that carried the JSON payload
+ # repo::
+ # the expected name of the repository.
+ #
+ # Host filters should check that the request+payload is compatible with the format they expect,
+ # and that the detected repo name matches the provided one. If either condition is not satisfied,
+ # they should return nil. Otherwise, they should agument the input hash with
+ # approrpiate keys extracting the relevant information (as indicated below).
+ #
+ # The default host and out filters produce and expect the following keys in the DataStream:
+ # event::
+ # the event type, as described by e.g. the X-GitHub-Event request header
+ # event_key::
+ # the main event-specific object key (e.g. issue in the case of issue_comment)
+ # payload::
+ # the hash representing the JSON payload
+ # repo::
+ # the full name of the repository (e.g. "ruby-rbot/rbot")
+ # author::
+ # the sender login (e.g. "Oblomov")
+ # action::
+ # the hook action
+ # ref::
+ # the ref referenced by the event
+ # number::
+ # the number of the issue or PR modified, or the number of commits
+ # title::
+ # title of the object
+ # link::
+ # the HTML link
+ def define_filters
+ @hostkey ||= :"webhook.host"
+ @outkey ||= :"webhook.out"
+
+ # the default output filter
+ webhook_out_filter :default do |s|
+ line1 = "%{repo}: %{author} %{action}"
+ [:number, :title, :ref, :link].each do |k|
+ line1 += "%{#{k}}" if s[k]
+ end
+ make_stream(line1, nil, s,
+ :repo_wrap => [Irc.color(:yellow), NormalText],
+ :author_wrap => Bold,
+ :number_wrap => [' ', ''],
+ :title_wrap => [" #{Irc.color(:green)}", NormalText],
+ :ref_wrap => [" (#{Irc.color(:yellow)}", "#{NormalText})"],
+ :link_wrap => [" <#{Irc.color(:aqualight)}", "#{NormalText}>"])
+ end
+
+ # the github host filter is actually implemented below
+ webhook_host_filter :github do |s|
+ github_host_filter(s)
+ end
+
+ # gitea is essentially compatible with github
+ webhook_host_filter :gitea do |s|
+ github_host_filter(s)
+ end
+
+ @user_types ||= datafile 'filters.rb'
+ load_filters
+ load_filters :path => @user_types
+ end
+
+ # Map the event name to the payload key storing the essential information
+ GITHUB_EVENT_KEY = {
+ :issues => :issue,
+ :ping => :hook,
+ }
+
+ # Host filters should return nil if they cannot process the given payload+request pair
+ def github_host_filter(input_stream)
+ request = input_stream[:request]
+ json = input_stream[:payload]
+ req_repo = input_stream[:repo]
+
+ return nil unless request['x-github-event']
+
+ repo = json[:repository]
+ return nil unless repo
+ repo = repo[:full_name]
+ return nil unless repo
+
+ return nil unless repo == req_repo
+
+ event = request.header['x-github-event'].first.to_sym
+
+ obj = nil
+ link = nil
+ title = nil
+
+ event_key = GITHUB_EVENT_KEY[event] || event
+
+ # :issue_comment needs special handling because it has two primary objects
+ # (the issue and the comment), and we take stuff from both
+ obj = json[event_key] || json[:issue]
+ if obj
+ link = json[:comment][:html_url] rescue nil if event == :issue_comment
+ link ||= obj[:html_url] || obj[:url]
+ title = obj[:title]
+ else
+ link = json[:html_url] || json[:url] || json[:compare]
+ end
+ title ||= json[:zen] || json[:commits].last[:message].lines.first.chomp rescue nil
+
+ stream_hash = { :event => event,
+ :event_key => event_key,
+ :ref => json[:ref],
+ :author => (json[:sender][:login] rescue nil),
+ :action => json[:action] || event,
+ :title => title,
+ :link => link
+ }
+
+ num = json[:number] || obj[:number] rescue nil
+ stream_hash[:number] = '%{object} #%{num}' % { :num => num, :object => event_key.to_s.gsub('_', ' ') } if num
+ num = json[:size] || json[:commits].size rescue nil
+ stream_hash[:number] = _("%{num} commits") % { :num => num } if num
+
+ debug stream_hash
+
+ return input_stream.merge stream_hash
+ end
+
+
+ def initialize
+ super
+ define_filters
+
+ # @repos is hash the maps each reapo to a hash of watchers
+ # channel => filter
+ @repos = {}
+ if @registry.has_key?(:repos)
+ @repos = @registry[:repos]
+ end
+ end
+
+ def name
+ "webhook"
+ end
+
+ def save
+ @registry[:repos] = Hash.new.merge @repos
+ end
+
+ def help(plugin, topic="")
+ case topic
+ when "watch"
+ ["webhook watch #{Bold}repository#{Bold} #{Bold}filter#{Bold} [in #{Bold}\#channel#{Bold}]: announce webhook triggers matching the given repository, using the given output filter.",
+ "the repository should be defined as service:name where service is known service, and name the actual repository name.",
+ "example: webhook watch github:ruby-rbot/rbot github"].join("\n")
+ when "unwatch"
+ " unwatch #{Bold}repository#{Bold} [in #{Bold}\#channel#{Bold}]: stop announcing webhhoks from the given repository"
+ else
+ " [un]watch <repository> [in #channel]: manage webhhok announcements for the given repository in the given channel"
+ end
+ end
+
+ def watch_repo(m, params)
+ repo = params[:repo]
+ chan = (params[:chan] || m.replyto).downcase
+ filter = params[:filter] || :default
+
+ @repos[repo] ||= {}
+ @repos[repo][chan] = filter
+ m.okay
+ end
+
+ def unwatch_repo(m, params)
+ repo = params[:repo]
+ chan = (params[:chan] || m.replyto).downcase
+
+ if @repo.has_key?(repo)
+ @repos[repo].delete(chan)
+ m.okay
+ if @repos[repo].empty?
+ @repos.delete(repo)
+ m.reply _("No more watchers, I'll forget about %{repo} altogether") % params
+ end
+ else
+ m.reply _("repo %{repo} not found") % params
+ end
+ end
+
+ # Display the host filters
+ def list_host_filters(m, params)
+ ar = @bot.filter_names(@hostkey)
+ if ar.empty?
+ m.reply _("No custom service filters registered")
+ else
+ m.reply ar.map { |k| k.to_s }.sort!.join(", ")
+ end
+ end
+
+ # Display the known output filters
+ def list_output_filters(m, params)
+ ar = @bot.filter_names(@outkey)
+ ar.delete(:default)
+ if ar.empty?
+ m.reply _("No custom output filters registered")
+ else
+ m.reply ar.map { |k| k.to_s }.sort!.join(", ")
+ end
+ end
+
+ # Display the known repos and watchers
+ def list_repos(m, params)
+ if @repos.empty?
+ m.reply "No repos defined"
+ return
+ end
+ msg = @repos.map do |repo, watchers|
+ [Bold + repo + Bold, watchers.map do |channel, filter|
+ "#{channel} (#{filter})"
+ end.join(", ")].join(": ")
+ end.join(", ")
+ m.reply msg
+ end
+
+ def filter_hook(json, request)
+ announce_method = @bot.config['webhook.announce_method']
+
+ debug request
+ debug json
+
+ @repos.each do |s_repo, watchers|
+ host, repo = s_repo.split(':', 2)
+ key = @bot.global_filter_name(host, @hostkey)
+ error "No host filter for #{host} (from #{s_repo})" unless @bot.has_filter?(key)
+
+ debug key
+ processed = @bot.filter(key, { :payload => json, :request => request, :repo => repo })
+ debug processed
+ next unless processed
+
+ # TODO if we see that the same output filter is applied to multiple channels,
+ # we should group the channels by filters and only do the output processing once
+ watchers.each do |channel, filter|
+ begin
+ key = @bot.global_filter_name(filter, @outkey)
+ key = @bot.global_filter_name(:default, @outkey) unless @bot.has_filter?(key)
+
+ debug key
+ output = @bot.filter(key, processed)
+ debug output
+
+ @bot.__send__(announce_method, channel, output)
+ rescue => e
+ error "Failed to announce #{json} for #{repo} in #{channel} with filter #{filter}"
+ debug e.inspect
+ debug e.backtrace.join("\n") if e.respond_to?(:backtrace)
+ end
+ end
+ # match found, stop checking
+ break
+ end
+ end
+
+ def process_hook(m, params)
+ json = nil
+ begin
+ json = JSON.parse(m.req.body, :symbolize_names => true)
+ rescue => e
+ error "Failed to parse request #{m.req}"
+ debug m.req
+ debug e.inspect
+ debug e.backtrace.join("\n") if e.respond_to?(:backtrace)
+ end
+
+ # Send the response early
+ if not json
+ m.send_plaintext("Failed\n", 400)
+ return
+ end
+
+ m.send_plaintext("OK\n", 200)
+
+ begin
+ filter_hook(json, m.req)
+ rescue => e
+ error e
+ debug e.inspect
+ debug e.backtrace.join("\n") if e.respond_to?(:backtrace)
+ end
+ end
+
+end
+
+plugin = WebHookPlugin.new
+plugin.web_map "/webhook", :action => :process_hook
+
+plugin.map 'webhook watch :repo :filter [in :chan]',
+ :action => :watch_repo,
+ :defaults => { :filter => nil }
+
+plugin.map 'webhook unwatch :repo [in :chan]',
+ :action => :unwatch_repo
+
+plugin.map 'webhook list [repos]',
+ :action => 'list_repos'
+
+plugin.map 'webhook [list] filters',
+ :action => 'list_output_filters'
+
+plugin.map 'webhook [list] hosts',
+ :action => 'list_host_filters'
+
+plugin.map 'webhook [list] services',
+ :action => 'list_host_filters'
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-15 02:15:07 +0000