discourse/lib/topic_view.rb

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require_dependency 'guardian'
require_dependency 'topic_query'
require_dependency 'filter_best_posts'
require_dependency 'gaps'
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class TopicView
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attr_reader :topic, :posts, :guardian, :filtered_posts, :chunk_size, :print
attr_accessor :draft, :draft_key, :draft_sequence, :user_custom_fields, :post_custom_fields
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def self.slow_chunk_size
10
end
def self.print_chunk_size
1000
end
def self.chunk_size
20
end
def self.default_post_custom_fields
@default_post_custom_fields ||= ["action_code_who"]
end
def self.post_custom_fields_whitelisters
@post_custom_fields_whitelisters ||= Set.new
end
def self.add_post_custom_fields_whitelister(&block)
post_custom_fields_whitelisters << block
end
def self.whitelisted_post_custom_fields(user)
wpcf = default_post_custom_fields + post_custom_fields_whitelisters.map { |w| w.call(user) }
wpcf.flatten.uniq
end
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def initialize(topic_id, user=nil, options={})
@user = user
@guardian = Guardian.new(@user)
@topic = find_topic(topic_id)
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@print = options[:print].present?
check_and_raise_exceptions
options.each do |key, value|
self.instance_variable_set("@#{key}".to_sym, value)
end
@page = 1 if (!@page || @page.zero?)
@chunk_size = case
when options[:slow_platform] then TopicView.slow_chunk_size
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when @print then TopicView.print_chunk_size
else TopicView.chunk_size
end
@limit ||= @chunk_size
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setup_filtered_posts
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@initial_load = true
@index_reverse = false
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filter_posts(options)
if @posts
added_fields = User.whitelisted_user_custom_fields(@guardian)
if added_fields.present?
@user_custom_fields = User.custom_fields_for_ids(@posts.map(&:user_id), added_fields)
end
end
whitelisted_fields = TopicView.whitelisted_post_custom_fields(@user)
if whitelisted_fields.present? && @posts
@post_custom_fields = Post.custom_fields_for_ids(@posts.map(&:id), whitelisted_fields)
end
@draft_key = @topic.draft_key
@draft_sequence = DraftSequence.current(@user, @draft_key)
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end
def canonical_path
path = relative_url
path << if @post_number
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page = ((@post_number.to_i - 1) / @limit) + 1
(page > 1) ? "?page=#{page}" : ""
else
(@page && @page.to_i > 1) ? "?page=#{@page}" : ""
end
path
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end
def contains_gaps?
@contains_gaps
end
def gaps
return unless @contains_gaps
Gaps.new(filtered_post_ids, unfiltered_posts.order(:sort_order).pluck(:id))
end
def last_post
return nil if @posts.blank?
@last_post ||= @posts.last
end
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def prev_page
if @page && @page > 1 && posts.length > 0
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@page - 1
else
nil
end
end
def next_page
@next_page ||= begin
if last_post && (@topic.highest_post_number > last_post.post_number)
@page + 1
end
end
end
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def prev_page_path
if prev_page > 1
"#{relative_url}?page=#{prev_page}"
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else
relative_url
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end
end
def next_page_path
"#{relative_url}?page=#{next_page}"
end
def absolute_url
"#{Discourse.base_url}#{relative_url}"
end
def relative_url
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"#{@topic.relative_url}#{@print ? '/print' : ''}"
end
def page_title
title = @topic.title
if SiteSetting.topic_page_title_includes_category && @topic.category_id != SiteSetting.uncategorized_category_id && @topic.category_id && @topic.category
title += " - #{topic.category.name}"
end
title
end
def title
@topic.title
end
def desired_post
return @desired_post if @desired_post.present?
return nil if posts.blank?
@desired_post = posts.detect {|p| p.post_number == @post_number.to_i}
@desired_post ||= posts.first
@desired_post
end
def summary
return nil if desired_post.blank?
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# TODO, this is actually quite slow, should be cached in the post table
excerpt = desired_post.excerpt(500, strip_links: true, text_entities: true)
(excerpt || "").gsub(/\n/, ' ').strip
end
def read_time
return nil if @post_number.present? && @post_number.to_i != 1 # only show for topic URLs
(@topic.word_count/SiteSetting.read_time_word_count).floor if @topic.word_count
end
def like_count
return nil if @post_number.present? && @post_number.to_i != 1 # only show for topic URLs
@topic.like_count
end
def image_url
if @post_number.present? && @post_number.to_i != 1 && @desired_post.present?
if @desired_post.image_url.present?
@desired_post.image_url
elsif @desired_post.user
# show poster avatar
@desired_post.user.avatar_template_url.gsub("{size}", "200")
end
else
@topic.image_url
end
end
def filter_posts(opts = {})
return filter_posts_near(opts[:post_number].to_i) if opts[:post_number].present?
return filter_posts_by_ids(opts[:post_ids]) if opts[:post_ids].present?
return filter_best(opts[:best], opts) if opts[:best].present?
filter_posts_paged(@page)
end
def primary_group_names
return @group_names if @group_names
primary_group_ids = Set.new
@posts.each do |p|
primary_group_ids << p.user.primary_group_id if p.user.try(:primary_group_id)
end
result = {}
unless primary_group_ids.empty?
Group.where(id: primary_group_ids.to_a).pluck(:id, :name).each do |g|
result[g[0]] = g[1]
end
end
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@group_names = result
end
# Find the sort order for a post in the topic
def sort_order_for_post_number(post_number)
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posts = Post.where(topic_id: @topic.id, post_number: post_number).with_deleted
posts = filter_post_types(posts)
posts.select(:sort_order).first.try(:sort_order)
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end
# Filter to all posts near a particular post number
def filter_posts_near(post_number)
min_idx, max_idx = get_minmax_ids(post_number)
filter_posts_in_range(min_idx, max_idx)
end
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def filter_posts_paged(page)
page = [page, 1].max
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min = @limit * (page - 1)
# Sometimes we don't care about the OP, for example when embedding comments
min = 1 if min == 0 && @exclude_first
max = (min + @limit) - 1
filter_posts_in_range(min, max)
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end
def filter_best(max, opts={})
filter = FilterBestPosts.new(@topic, @filtered_posts, max, opts)
@posts = filter.posts
@filtered_posts = filter.filtered_posts
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end
def read?(post_number)
return true unless @user
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read_posts_set.include?(post_number)
end
def has_deleted?
@predelete_filtered_posts.with_deleted
.where("posts.deleted_at IS NOT NULL")
.where("posts.post_number > 1")
.exists?
end
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def topic_user
@topic_user ||= begin
return nil if @user.blank?
@topic.topic_users.find_by(user_id: @user.id)
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end
end
def post_counts_by_user
@post_counts_by_user ||= Post.where(topic_id: @topic.id)
.where("user_id IS NOT NULL")
.group(:user_id)
.order("count_all DESC")
.limit(24)
.count
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end
def participants
@participants ||= begin
participants = {}
User.where(id: post_counts_by_user.map {|k,v| k}).each {|u| participants[u.id] = u}
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participants
end
end
def all_post_actions
@all_post_actions ||= PostAction.counts_for(@posts, @user)
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end
def all_active_flags
@all_active_flags ||= PostAction.active_flags_counts_for(@posts)
end
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def links
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@links ||= TopicLink.topic_map(guardian, @topic.id)
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end
def link_counts
@link_counts ||= TopicLink.counts_for(guardian,@topic, posts)
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end
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# Are we the initial page load? If so, we can return extra information like
# user post counts, etc.
def initial_load?
@initial_load
end
def suggested_topics
@suggested_topics ||= TopicQuery.new(@user).list_suggested_for(topic)
end
# This is pending a larger refactor, that allows custom orders
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# for now we need to look for the highest_post_number in the stream
# the cache on topics is not correct if there are deleted posts at
# the end of the stream (for mods), nor is it correct for filtered
# streams
def highest_post_number
@highest_post_number ||= @filtered_posts.maximum(:post_number)
end
def recent_posts
@filtered_posts.by_newest.with_user.first(25)
end
def current_post_ids
@current_post_ids ||= if @posts.is_a?(Array)
@posts.map {|p| p.id }
else
@posts.pluck(:post_number)
end
end
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# Returns an array of [id, post_number, days_ago] tuples. `days_ago` is there for the timeline
# calculations.
def filtered_post_stream
@filtered_post_stream ||= @filtered_posts.order(:sort_order)
.pluck(:id,
:post_number,
'EXTRACT(DAYS FROM CURRENT_TIMESTAMP - created_at)::INT AS days_ago')
end
def filtered_post_ids
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@filtered_post_ids ||= filtered_post_stream.map {|tuple| tuple[0]}
end
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protected
def read_posts_set
@read_posts_set ||= begin
result = Set.new
return result unless @user.present?
return result unless topic_user.present?
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post_numbers = PostTiming
.where(topic_id: @topic.id, user_id: @user.id)
.where(post_number: current_post_ids)
.pluck(:post_number)
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post_numbers.each {|pn| result << pn}
result
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end
end
private
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def filter_post_types(posts)
visible_types = Topic.visible_post_types(@user)
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if @user.present?
posts.where("posts.user_id = ? OR post_type IN (?)", @user.id, visible_types)
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else
posts.where(post_type: visible_types)
end
end
def filter_posts_by_ids(post_ids)
# TODO: Sort might be off
@posts = Post.where(id: post_ids, topic_id: @topic.id)
.includes(:user, :reply_to_user, :incoming_email)
.order('sort_order')
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@posts = filter_post_types(@posts)
@posts = @posts.with_deleted if @guardian.can_see_deleted_posts?
@posts
end
def filter_posts_in_range(min, max)
post_count = (filtered_post_ids.length - 1)
max = [max, post_count].min
return @posts = [] if min > max
min = [[min, max].min, 0].max
@posts = filter_posts_by_ids(filtered_post_ids[min..max])
@posts
end
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def find_topic(topic_id)
# with_deleted covered in #check_and_raise_exceptions
finder = Topic.with_deleted.where(id: topic_id).includes(:category)
finder.first
end
def unfiltered_posts
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result = filter_post_types(@topic.posts)
result = result.with_deleted if @guardian.can_see_deleted_posts?
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result = result.where("user_id IS NOT NULL") if @exclude_deleted_users
result = result.where(hidden: false) if @exclude_hidden
result
end
def setup_filtered_posts
# Certain filters might leave gaps between posts. If that's true, we can return a gap structure
@contains_gaps = false
@filtered_posts = unfiltered_posts
# Filters
if @filter == 'summary'
@filtered_posts = @filtered_posts.summary(@topic.id)
@contains_gaps = true
end
if @best.present?
@filtered_posts = @filtered_posts.where('posts.post_type = ?', Post.types[:regular])
@contains_gaps = true
end
# Username filters
if @username_filters.present?
usernames = @username_filters.map{|u| u.downcase}
@filtered_posts = @filtered_posts.where('post_number = 1 OR posts.user_id IN (SELECT u.id FROM users u WHERE username_lower IN (?))', usernames)
@contains_gaps = true
end
# Deleted
# This should be last - don't want to tell the admin about deleted posts that clicking the button won't show
# copy the filter for has_deleted? method
@predelete_filtered_posts = @filtered_posts.spawn
if @guardian.can_see_deleted_posts? && !@show_deleted && has_deleted?
@filtered_posts = @filtered_posts.where("deleted_at IS NULL OR post_number = 1")
@contains_gaps = true
end
end
def check_and_raise_exceptions
raise Discourse::NotFound if @topic.blank?
# Special case: If the topic is private and the user isn't logged in, ask them
# to log in!
if @topic.present? && @topic.private_message? && @user.blank?
raise Discourse::NotLoggedIn.new
end
raise Discourse::InvalidAccess.new("can't see #{@topic}", @topic) unless guardian.can_see?(@topic)
end
def get_minmax_ids(post_number)
# Find the closest number we have
closest_index = closest_post_to(post_number)
return nil if closest_index.nil?
# Make sure to get at least one post before, even with rounding
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posts_before = (@limit.to_f / 4).floor
posts_before = 1 if posts_before.zero?
min_idx = closest_index - posts_before
min_idx = 0 if min_idx < 0
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max_idx = min_idx + (@limit - 1)
# Get a full page even if at the end
ensure_full_page(min_idx, max_idx)
end
def ensure_full_page(min, max)
upper_limit = (filtered_post_ids.length - 1)
if max >= upper_limit
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return (upper_limit - @limit) + 1, upper_limit
else
return min, max
end
end
def closest_post_to(post_number)
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# happy path
closest_post = @filtered_posts.where("post_number = ?", post_number).limit(1).pluck(:id)
if closest_post.empty?
# less happy path, missing post
closest_post = @filtered_posts.order("@(post_number - #{post_number})").limit(1).pluck(:id)
end
return nil if closest_post.empty?
filtered_post_ids.index(closest_post.first) || filtered_post_ids[0]
end
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end