discourse/lib/post_revisor.rb

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require 'edit_rate_limiter'
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class PostRevisor
attr_reader :category_changed
def initialize(post)
@post = post
end
# Recognized options:
# :edit_reason User-supplied edit reason
# :new_user New owner of the post
# :revised_at changes the date of the revision
# :force_new_version bypass ninja-edit window
# :bypass_bump do not bump the topic, even if last post
# :skip_validation ask ActiveRecord to skip validations
#
def revise!(editor, new_raw, opts = {})
@editor = editor
@opts = opts
@new_raw = TextCleaner.normalize_whitespaces(new_raw).gsub(/\s+\z/, "")
return false unless should_revise?
@post.acting_user = @editor
Post.transaction do
revise_post
# TODO these callbacks are being called in a transaction
# it is kind of odd, cause the callback is called before_edit
# but the post is already edited at this point
# trouble is that much of the logic of should I edit? is deeper
# down so yanking this in front of the transaction will lead to
# false positives. This system needs a review
plugin_callbacks
update_category_description
update_topic_excerpt
@post.advance_draft_sequence
end
# WARNING: do not pull this into the transaction, it can fire events in
# sidekiq before the post is done saving leading to corrupt state
post_process_post
update_topic_word_counts
PostAlerter.new.after_save_post(@post)
@post.publish_change_to_clients! :revised
BadgeGranter.queue_badge_grant(Badge::Trigger::PostRevision, post: @post)
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true
end
private
def should_revise?
@post.raw != @new_raw || @opts[:changed_owner]
end
def revise_post
if should_create_new_version?
revise_and_create_new_version
else
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update_post
end
end
def plugin_callbacks
DiscourseEvent.trigger :before_edit_post, @post
DiscourseEvent.trigger :validate_post, @post
end
def get_revised_at
@opts[:revised_at] || Time.now
end
def should_create_new_version?
@post.last_editor_id != @editor.id ||
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get_revised_at - @post.last_version_at > SiteSetting.ninja_edit_window.to_i ||
@opts[:changed_owner] == true ||
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@opts[:force_new_version] == true
end
def revise_and_create_new_version
@post.version += 1
@post.last_version_at = get_revised_at
update_post
EditRateLimiter.new(@editor).performed! unless @opts[:bypass_rate_limiter] == true
bump_topic unless @opts[:bypass_bump]
end
def bump_topic
unless Post.where('post_number > ? and topic_id = ?', @post.post_number, @post.topic_id).exists?
@post.topic.update_column(:bumped_at, Time.now)
TopicTrackingState.publish_latest(@post.topic)
end
end
def update_topic_word_counts
Topic.exec_sql("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: @post.topic_id)
end
def update_post
@post.raw = @new_raw
@post.word_count = @new_raw.scan(/\w+/).size
@post.last_editor_id = @editor.id
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@post.edit_reason = @opts[:edit_reason] if @opts[:edit_reason]
@post.user_id = @opts[:new_user].id if @opts[:new_user]
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@post.self_edits += 1 if @editor == @post.user
if @editor == @post.user && @post.hidden && @post.hidden_reason_id == Post.hidden_reasons[:flag_threshold_reached]
PostAction.clear_flags!(@post, Discourse.system_user)
@post.unhide!
end
@post.extract_quoted_post_numbers
@post.save(validate: !@opts[:skip_validations])
@post.save_reply_relationships
end
def update_category_description
# If we're revising the first post, we might have to update the category description
return unless @post.post_number == 1
# Is there a category with our topic id?
category = Category.find_by(topic_id: @post.topic_id)
return unless category.present?
# If found, update its description
body = @post.cooked
matches = body.scan(/\<p\>(.*)\<\/p\>/)
if matches && matches[0] && matches[0][0]
new_description = matches[0][0]
new_description = nil if new_description == I18n.t("category.replace_paragraph")
category.update_column(:description, new_description)
@category_changed = category
end
end
def update_topic_excerpt
@post.topic.update_column(:excerpt, @post.excerpt(220, strip_links: true)) if @post.post_number == 1
end
def post_process_post
@post.invalidate_oneboxes = true
@post.trigger_post_process
end
end