609 lines
17 KiB
Ruby
609 lines
17 KiB
Ruby
require "edit_rate_limiter"
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require 'post_locker'
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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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if category_id == 0 || tc.guardian.can_move_topic_to_category?(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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end
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track_topic_field(:tags) do |tc, tags|
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if tc.guardian.can_tag_topics?
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prev_tags = tc.topic.tags.map(&:name)
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next if tags.blank? && prev_tags.blank?
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if !DiscourseTagging.tag_topic_by_names(tc.topic, tc.guardian, tags)
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tc.check_result(false)
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next
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end
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if prev_tags.sort != tags.sort
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tc.record_change('tags', prev_tags, tags)
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DB.after_commit do
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post = tc.topic.ordered_posts.first
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notified_user_ids = [post.user_id, post.last_editor_id].uniq
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Jobs.enqueue(:notify_tag_change, post_id: post.id, notified_user_ids: notified_user_ids)
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end
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end
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end
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end
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track_topic_field(:tags_empty_array) do |tc, val|
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if val.present? && tc.guardian.can_tag_topics?
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prev_tags = tc.topic.tags.map(&:name)
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if !DiscourseTagging.tag_topic_by_names(tc.topic, tc.guardian, [])
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tc.check_result(false)
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next
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end
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tc.record_change('tags', prev_tags, nil)
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end
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end
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track_topic_field(:featured_link) do |topic_changes, featured_link|
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if SiteSetting.topic_featured_link_enabled &&
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topic_changes.guardian.can_edit_featured_link?(topic_changes.topic.category_id)
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topic_changes.record_change('featured_link', topic_changes.topic.featured_link, featured_link)
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topic_changes.topic.featured_link = featured_link
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end
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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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# - skip_revision: do not create a new PostRevision record
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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[:edit_reason].present?
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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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@skip_revision = false
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@skip_revision = @opts[:skip_revision] if @opts.has_key?(:skip_revision)
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old_raw = @post.raw
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Post.transaction do
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revise_post
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yield if block_given?
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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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# Lock the post by default if the appropriate setting is true
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if (
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SiteSetting.staff_edit_locks_post? &&
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!@post.wiki? &&
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@fields.has_key?('raw') &&
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@editor.staff? &&
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@editor != Discourse.system_user &&
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!@post.user.staff?
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)
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PostLocker.new(@post, @editor).lock
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end
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# We log staff edits to posts
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if @editor.staff? && @editor.id != @post.user.id && @fields.has_key?('raw')
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StaffActionLogger.new(@editor).log_post_edit(
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@post,
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old_raw: old_raw
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)
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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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QuotedPost.extract_from(@post)
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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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TopicLink.extract_from(@post)
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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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raw.present? ? 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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advance_draft_sequence
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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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if should_create_new_version?
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revise_and_create_new_version
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else
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unless cached_original_raw
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self.original_raw = @post.raw
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self.original_cooked = @post.cooked
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end
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revise
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end
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end
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def should_create_new_version?
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return false if @skip_revision
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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 original_raw_key
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"original_raw_#{(@last_version_at.to_f * 1000).to_i}#{@post.id}"
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end
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def original_cooked_key
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"original_cooked_#{(@last_version_at.to_f * 1000).to_i}#{@post.id}"
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end
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def cached_original_raw
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@cached_original_raw ||= $redis.get(original_raw_key)
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end
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def cached_original_cooked
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@cached_original_cooked ||= $redis.get(original_cooked_key)
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end
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def original_raw
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cached_original_raw || @post.raw
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end
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def original_raw=(val)
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@cached_original_raw = val
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$redis.setex(original_raw_key, SiteSetting.editing_grace_period + 1, val)
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end
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def original_cooked=(val)
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@cached_original_cooked = val
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$redis.setex(original_cooked_key, SiteSetting.editing_grace_period + 1, val)
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end
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def diff_size(before, after)
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changes = 0
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ONPDiff.new(before, after).short_diff.each do |str, type|
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next if type == :common
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changes += str.length
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end
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changes
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end
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def ninja_edit?
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return false if (@revised_at - @last_version_at) > SiteSetting.editing_grace_period.to_i
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return false if @post.reviewable_flag.present?
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if new_raw = @fields[:raw]
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max_diff = SiteSetting.editing_grace_period_max_diff.to_i
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if @editor.staff? || (@editor.trust_level > 1)
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max_diff = SiteSetting.editing_grace_period_max_diff_high_trust.to_i
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end
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if (original_raw.length - new_raw.length).abs > max_diff ||
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diff_size(original_raw, new_raw) > max_diff
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return false
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end
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end
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true
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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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USER_ACTIONS_TO_REMOVE ||= [UserAction::REPLY, UserAction::RESPONSE]
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def update_post
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if @fields.has_key?("user_id") && @fields["user_id"] != @post.user_id && @post.user_id != nil
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prev_owner = User.find(@post.user_id)
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new_owner = User.find(@fields["user_id"])
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UserAction.where(target_post_id: @post.id)
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.where(user_id: prev_owner.id)
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.where(action_type: USER_ACTIONS_TO_REMOVE)
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.update_all(user_id: new_owner.id)
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if @post.post_number == 1
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UserAction.where(target_topic_id: @post.topic_id)
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.where(user_id: prev_owner.id)
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.where(action_type: UserAction::NEW_TOPIC)
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.update_all(user_id: new_owner.id)
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end
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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(/[[:word:]]+/).size if @fields.has_key?(:raw)
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@post.self_edits += 1 if self_edit?
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remove_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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.where(user_id: prev_owner.id)
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.where(action_type: UserAction::WAS_LIKED)
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.update_all(user_id: new_owner.id)
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private_message = @post.topic.private_message?
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prev_owner_user_stat = prev_owner.user_stat
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unless private_message
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prev_owner_user_stat.post_count -= 1 if @post.post_type == Post.types[:regular]
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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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end
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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 = new_owner.user_stat
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unless private_message
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new_owner_user_stat.post_count += 1 if @post.post_type == Post.types[:regular]
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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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end
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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 remove_flags_and_unhide_post
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return unless editing_a_flagged_and_hidden_post?
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flaggers = []
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@post.post_actions.where(post_action_type_id: PostActionType.flag_types_without_custom.values).each do |action|
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flaggers << action.user if action.user
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action.remove_act!(Discourse.system_user)
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end
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@post.unhide!
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PostActionNotifier.after_post_unhide(@post, flaggers)
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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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return if @skip_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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if modifications["raw"]
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modifications["raw"][0] = cached_original_raw || modifications["raw"][0]
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end
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if modifications["cooked"]
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modifications["cooked"][0] = cached_original_cooked || modifications["cooked"][0]
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end
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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].to_s
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new_value = modifications[field][1].to_s
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if old_value != new_value
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revision.modifications[field] = [old_value, new_value]
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else
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revision.modifications.delete(field)
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end
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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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# should probably do this before saving the post!
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if revision.modifications.empty?
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revision.destroy
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@post.version -= 1
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@post.public_version -= 1
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@post.save
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else
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revision.save
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end
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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 || @topic_changes.errored? || @opts[:bypass_bump] == true || @post.whisper?
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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)
|
|
.exists?
|
|
end
|
|
|
|
def plugin_callbacks
|
|
DiscourseEvent.trigger(:before_edit_post, @post)
|
|
DiscourseEvent.trigger(:validate_post, @post)
|
|
end
|
|
|
|
def revise_topic
|
|
return unless @post.is_first_post?
|
|
|
|
update_topic_excerpt
|
|
update_category_description
|
|
end
|
|
|
|
def update_topic_excerpt
|
|
excerpt = @post.excerpt_for_topic
|
|
@topic.update_column(:excerpt, excerpt)
|
|
if @topic.archetype == "banner"
|
|
ApplicationController.banner_json_cache.clear
|
|
end
|
|
end
|
|
|
|
def update_category_description
|
|
return unless category = Category.find_by(topic_id: @topic.id)
|
|
|
|
doc = Nokogiri::HTML.fragment(@post.cooked)
|
|
doc.css("img").remove
|
|
|
|
if html = doc.css("p").first&.inner_html&.strip
|
|
new_description = html unless html.starts_with?(Category.post_template[0..50])
|
|
category.update_column(:description, new_description)
|
|
@category_changed = category
|
|
else
|
|
@post.errors[:base] << I18n.t("category.errors.description_incomplete")
|
|
end
|
|
end
|
|
|
|
def advance_draft_sequence
|
|
@post.advance_draft_sequence
|
|
end
|
|
|
|
def post_process_post
|
|
@post.invalidate_oneboxes = true
|
|
@post.trigger_post_process
|
|
DiscourseEvent.trigger(:post_edited, @post, self.topic_changed?)
|
|
end
|
|
|
|
def update_topic_word_counts
|
|
DB.exec("UPDATE topics
|
|
SET word_count = (
|
|
SELECT SUM(COALESCE(posts.word_count, 0))
|
|
FROM posts
|
|
WHERE posts.topic_id = :topic_id
|
|
)
|
|
WHERE topics.id = :topic_id", topic_id: @topic.id)
|
|
end
|
|
|
|
def alert_users
|
|
return if @editor.id == Discourse::SYSTEM_USER_ID
|
|
Jobs.enqueue(:post_alert, post_id: @post.id)
|
|
end
|
|
|
|
def publish_changes
|
|
options =
|
|
if !@topic_changes.diff.empty? && !@topic_changes.errored?
|
|
{ reload_topic: true }
|
|
else
|
|
{}
|
|
end
|
|
|
|
@post.publish_change_to_clients!(:revised, options)
|
|
end
|
|
|
|
def grant_badge
|
|
BadgeGranter.queue_badge_grant(Badge::Trigger::PostRevision, post: @post)
|
|
end
|
|
|
|
def successfully_saved_post_and_topic
|
|
@post_successfully_saved && !@topic_changes.errored?
|
|
end
|
|
|
|
end
|