414 lines
11 KiB
Ruby
414 lines
11 KiB
Ruby
require "edit_rate_limiter"
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class PostRevisor
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# Helps us track changes to a topic.
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#
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# It's passed to `track_topic_fields` callbacks so they can record if they
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# changed a value or not. This is needed for things like custom fields.
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class TopicChanges
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attr_reader :topic, :user
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def initialize(topic, user)
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@topic = topic
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@user = user
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@changed = {}
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@errored = false
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end
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def errored?
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@errored
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end
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def guardian
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@guardian ||= Guardian.new(@user)
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end
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def record_change(field_name, previous_val, new_val)
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return if previous_val == new_val
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diff[field_name] = [previous_val, new_val]
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end
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def check_result(res)
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@errored = true if !res
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end
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def diff
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@diff ||= {}
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end
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end
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POST_TRACKED_FIELDS = %w{raw cooked edit_reason user_id wiki post_type}
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attr_reader :category_changed
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def initialize(post, topic=nil)
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@post = post
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@topic = topic || post.topic
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end
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def self.tracked_topic_fields
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@@tracked_topic_fields ||= {}
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@@tracked_topic_fields
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end
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def self.track_topic_field(field, &block)
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tracked_topic_fields[field] = block
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# Define it in the serializer unless it already has been defined
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unless PostRevisionSerializer.instance_methods(false).include?("#{field}_changes".to_sym)
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PostRevisionSerializer.add_compared_field(field)
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end
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end
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# Fields we want to record revisions for by default
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track_topic_field(:title) do |tc, title|
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tc.record_change('title', tc.topic.title, title)
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tc.topic.title = title
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end
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track_topic_field(:category_id) do |tc, category_id|
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tc.record_change('category_id', tc.topic.category_id, category_id)
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tc.check_result(tc.topic.change_category_to_id(category_id))
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end
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# AVAILABLE OPTIONS:
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# - revised_at: changes the date of the revision
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# - force_new_version: bypass ninja-edit window
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# - bypass_rate_limiter:
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# - bypass_bump: do not bump the topic, even if last post
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# - skip_validations: ask ActiveRecord to skip validations
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def revise!(editor, fields, opts={})
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@editor = editor
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@fields = fields.with_indifferent_access
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@opts = opts
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@topic_changes = TopicChanges.new(@topic, editor)
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# some normalization
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@fields[:raw] = cleanup_whitespaces(@fields[:raw]) if @fields.has_key?(:raw)
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@fields[:user_id] = @fields[:user_id].to_i if @fields.has_key?(:user_id)
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@fields[:category_id] = @fields[:category_id].to_i if @fields.has_key?(:category_id)
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# always reset edit_reason unless provided
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@fields[:edit_reason] = nil unless @fields.has_key?(:edit_reason)
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return false unless should_revise?
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@post.acting_user = @editor
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@topic.acting_user = @editor
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@revised_at = @opts[:revised_at] || Time.now
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@last_version_at = @post.last_version_at || Time.now
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@version_changed = false
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@post_successfully_saved = true
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@validate_post = true
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@validate_post = @opts[:validate_post] if @opts.has_key?(:validate_post)
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@validate_post = !@opts[:skip_validations] if @opts.has_key?(:skip_validations)
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@validate_topic = true
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@validate_topic = @opts[:validate_topic] if @opts.has_key?(:validate_topic)
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@validate_topic = !@opts[:validate_topic] if @opts.has_key?(:skip_validations)
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Post.transaction do
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revise_post
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# TODO: these callbacks are being called in a transaction
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# it is kind of odd, because the callback is called "before_edit"
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# but the post is already edited at this point
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# Trouble is that much of the logic of should I edit? is deeper
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# down so yanking this in front of the transaction will lead to
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# false positive.
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plugin_callbacks
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revise_topic
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advance_draft_sequence
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end
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# WARNING: do not pull this into the transaction
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# it can fire events in sidekiq before the post is done saving
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# leading to corrupt state
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post_process_post
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update_topic_word_counts
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alert_users
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publish_changes
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grant_badge
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successfully_saved_post_and_topic
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end
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def cleanup_whitespaces(raw)
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TextCleaner.normalize_whitespaces(raw).gsub(/\s+\z/, "")
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end
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def should_revise?
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post_changed? || topic_changed?
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end
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def post_changed?
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POST_TRACKED_FIELDS.each do |field|
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return true if @fields.has_key?(field) && @fields[field] != @post.send(field)
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end
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false
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end
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def topic_changed?
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PostRevisor.tracked_topic_fields.keys.any? {|f| @fields.has_key?(f)}
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end
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def revise_post
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should_create_new_version? ? revise_and_create_new_version : revise
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end
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def should_create_new_version?
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edited_by_another_user? || !ninja_edit? || owner_changed? || force_new_version?
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end
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def edited_by_another_user?
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@post.last_editor_id != @editor.id
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end
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def ninja_edit?
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@revised_at - @last_version_at <= SiteSetting.ninja_edit_window.to_i
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end
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def owner_changed?
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@fields.has_key?(:user_id) && @fields[:user_id] != @post.user_id
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end
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def force_new_version?
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@opts[:force_new_version] == true
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end
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def revise_and_create_new_version
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@version_changed = true
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@post.version += 1
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@post.public_version += 1
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@post.last_version_at = @revised_at
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revise
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perform_edit
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bump_topic
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end
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def revise
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update_post
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update_topic if topic_changed?
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create_or_update_revision
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end
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def update_post
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prev_owner, new_owner = nil, nil
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if @fields.has_key?("user_id") && @fields["user_id"] != @post.user_id
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prev_owner = User.find_by_id(@post.user_id)
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new_owner = User.find_by_id(@fields["user_id"])
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UserAction.where( target_post_id: @post.id,
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user_id: prev_owner.id,
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action_type: [UserAction::NEW_TOPIC, UserAction::REPLY, UserAction::RESPONSE] )
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.find_each { |ua| ua.destroy }
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# UserActionObserver will create new UserAction records for the new owner
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end
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POST_TRACKED_FIELDS.each do |field|
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@post.send("#{field}=", @fields[field]) if @fields.has_key?(field)
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end
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@post.last_editor_id = @editor.id
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@post.word_count = @fields[:raw].scan(/\w+/).size if @fields.has_key?(:raw)
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@post.self_edits += 1 if self_edit?
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clear_flags_and_unhide_post
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@post.extract_quoted_post_numbers
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@post_successfully_saved = @post.save(validate: @validate_post)
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@post.save_reply_relationships
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# post owner changed
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if prev_owner && new_owner && prev_owner != new_owner
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likes = UserAction.where( target_post_id: @post.id,
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user_id: prev_owner.id,
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action_type: UserAction::WAS_LIKED ).update_all(user_id: new_owner.id)
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prev_owner.user_stat.post_count -= 1
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prev_owner.user_stat.topic_count -= 1 if @post.is_first_post?
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prev_owner.user_stat.likes_received -= likes
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prev_owner.user_stat.update_topic_reply_count
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if @post.created_at == prev_owner.user_stat.first_post_created_at
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prev_owner.user_stat.first_post_created_at = prev_owner.posts.order('created_at ASC').first.try(:created_at)
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end
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prev_owner.user_stat.save
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new_owner.user_stat.post_count += 1
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new_owner.user_stat.topic_count += 1 if @post.is_first_post?
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new_owner.user_stat.likes_received += likes
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new_owner.user_stat.update_topic_reply_count
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new_owner.user_stat.save
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end
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end
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def self_edit?
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@editor == @post.user
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end
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def clear_flags_and_unhide_post
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return unless editing_a_flagged_and_hidden_post?
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PostAction.clear_flags!(@post, Discourse.system_user)
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@post.unhide!
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end
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def editing_a_flagged_and_hidden_post?
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self_edit? &&
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@post.hidden &&
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@post.hidden_reason_id == Post.hidden_reasons[:flag_threshold_reached]
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end
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def update_topic
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Topic.transaction do
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PostRevisor.tracked_topic_fields.each do |f, cb|
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if !@topic_changes.errored? && @fields.has_key?(f)
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cb.call(@topic_changes, @fields[f])
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end
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end
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unless @topic_changes.errored?
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@topic_changes.check_result(@topic.save(validate: @validate_topic))
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end
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end
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end
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def create_or_update_revision
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# don't create an empty revision if something failed
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return unless successfully_saved_post_and_topic
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@version_changed ? create_revision : update_revision
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end
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def create_revision
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modifications = post_changes.merge(@topic_changes.diff)
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PostRevision.create!(
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user_id: @post.last_editor_id,
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post_id: @post.id,
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number: @post.version,
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modifications: modifications
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)
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end
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def update_revision
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return unless revision = PostRevision.find_by(post_id: @post.id, number: @post.version)
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revision.user_id = @post.last_editor_id
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modifications = post_changes.merge(@topic_changes.diff)
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modifications.each_key do |field|
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if revision.modifications.has_key?(field)
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old_value = revision.modifications[field][0]
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new_value = modifications[field][1]
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revision.modifications[field] = [old_value, new_value]
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else
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revision.modifications[field] = modifications[field]
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end
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end
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revision.save if modifications.length
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end
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def post_changes
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@post.previous_changes.slice(*POST_TRACKED_FIELDS)
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end
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def perform_edit
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return if bypass_rate_limiter?
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EditRateLimiter.new(@editor).performed!
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end
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def bypass_rate_limiter?
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@opts[:bypass_rate_limiter] == true
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end
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def bump_topic
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return if bypass_bump? || !is_last_post?
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@topic.update_column(:bumped_at, Time.now)
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TopicTrackingState.publish_latest(@topic)
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end
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def bypass_bump?
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!@post_successfully_saved || @opts[:bypass_bump] == true
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end
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def is_last_post?
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!Post.where(topic_id: @topic.id)
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.where("post_number > ?", @post.post_number)
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.exists?
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end
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def plugin_callbacks
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DiscourseEvent.trigger(:before_edit_post, @post)
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DiscourseEvent.trigger(:validate_post, @post)
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end
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def revise_topic
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return unless @post.is_first_post?
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update_topic_excerpt
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update_category_description
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end
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def update_topic_excerpt
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excerpt = @post.excerpt(220, strip_links: true)
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@topic.update_column(:excerpt, excerpt)
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if @topic.archetype == "banner"
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ApplicationController.banner_json_cache.clear
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end
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end
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def update_category_description
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return unless category = Category.find_by(topic_id: @topic.id)
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body = @post.cooked
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matches = body.scan(/\<p\>(.*)\<\/p\>/)
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if matches && matches[0] && matches[0][0]
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new_description = matches[0][0]
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new_description = nil if new_description == I18n.t("category.replace_paragraph")
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category.update_column(:description, new_description)
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@category_changed = category
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end
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end
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def advance_draft_sequence
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@post.advance_draft_sequence
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end
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def post_process_post
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@post.invalidate_oneboxes = true
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@post.trigger_post_process
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end
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def update_topic_word_counts
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Topic.exec_sql("UPDATE topics
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SET word_count = (
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SELECT SUM(COALESCE(posts.word_count, 0))
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FROM posts
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WHERE posts.topic_id = :topic_id
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)
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WHERE topics.id = :topic_id", topic_id: @topic.id)
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end
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def alert_users
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PostAlerter.new.after_save_post(@post)
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end
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def publish_changes
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@post.publish_change_to_clients!(:revised)
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end
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def grant_badge
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BadgeGranter.queue_badge_grant(Badge::Trigger::PostRevision, post: @post)
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end
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def successfully_saved_post_and_topic
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@post_successfully_saved && !@topic_changes.errored?
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end
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end
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