discourse/app/controllers/posts_controller.rb

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require_dependency 'post_creator'
require_dependency 'post_destroyer'
require_dependency 'distributed_memoizer'
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class PostsController < ApplicationController
# Need to be logged in for all actions here
before_filter :ensure_logged_in, except: [:show, :replies, :by_number, :short_link, :reply_history, :revisions, :latest_revision, :expand_embed, :markdown, :raw, :cooked]
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skip_before_filter :check_xhr, only: [:markdown_id, :markdown_num, :short_link]
def markdown_id
markdown Post.find(params[:id].to_i)
end
def markdown_num
markdown Post.find_by(topic_id: params[:topic_id].to_i, post_number: (params[:post_number] || 1).to_i)
end
def markdown(post)
if post && guardian.can_see?(post)
render text: post.raw, content_type: 'text/plain'
else
raise Discourse::NotFound
end
end
def cooked
post = find_post_from_params
render json: {cooked: post.cooked}
end
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def raw_email
post = Post.find(params[:id].to_i)
guardian.ensure_can_view_raw_email!(post)
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render json: {raw_email: post.raw_email}
end
def short_link
post = Post.find(params[:post_id].to_i)
# Stuff the user in the request object, because that's what IncomingLink wants
if params[:user_id]
user = User.find(params[:user_id].to_i)
request['u'] = user.username_lower if user
end
redirect_to post.url
end
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def create
params = create_params
key = params_key(params)
error_json = nil
if (is_api?)
payload = DistributedMemoizer.memoize(key, 120) do
success, json = create_post(params)
unless success
error_json = json
raise Discourse::InvalidPost
end
json
end
else
success, payload = create_post(params)
unless success
error_json = payload
raise Discourse::InvalidPost
end
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end
render json: payload
rescue Discourse::InvalidPost
render json: error_json, status: 422
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end
def create_post(params)
post_creator = PostCreator.new(current_user, params)
post = post_creator.create
if post_creator.errors.present?
# If the post was spam, flag all the user's posts as spam
current_user.flag_linked_posts_as_spam if post_creator.spam?
[false, MultiJson.dump(errors: post_creator.errors.full_messages)]
else
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DiscourseEvent.trigger(:topic_saved, post.topic, params)
post_serializer = PostSerializer.new(post, scope: guardian, root: false)
post_serializer.draft_sequence = DraftSequence.current(current_user, post.topic.draft_key)
[true, MultiJson.dump(post_serializer)]
end
end
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def update
params.require(:post)
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post = Post.where(id: params[:id])
post = post.with_deleted if guardian.is_staff?
post = post.first
post.image_sizes = params[:image_sizes] if params[:image_sizes].present?
if too_late_to(:edit, post)
return render json: { errors: [I18n.t('too_late_to_edit')] }, status: 422
end
guardian.ensure_can_edit!(post)
changes = {
raw: params[:post][:raw],
edit_reason: params[:post][:edit_reason]
}
# to stay consistent with the create api, we allow for title & category changes here
if post.post_number == 1
changes[:title] = params[:title] if params[:title]
changes[:category_id] = params[:post][:category_id] if params[:post][:category_id]
end
revisor = PostRevisor.new(post)
if revisor.revise!(current_user, changes)
TopicLink.extract_from(post)
QuotedPost.extract_from(post)
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end
return render_json_error(post) if post.errors.present?
return render_json_error(post.topic) if post.topic.errors.present?
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post_serializer = PostSerializer.new(post, scope: guardian, root: false)
post_serializer.draft_sequence = DraftSequence.current(current_user, post.topic.draft_key)
link_counts = TopicLink.counts_for(guardian,post.topic, [post])
post_serializer.single_post_link_counts = link_counts[post.id] if link_counts.present?
result = {post: post_serializer.as_json}
if revisor.category_changed.present?
result[:category] = BasicCategorySerializer.new(revisor.category_changed, scope: guardian, root: false).as_json
end
render_json_dump(result)
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end
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def show
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post = find_post_from_params
display_post(post)
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end
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def by_number
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post = find_post_from_params_by_number
display_post(post)
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end
def reply_history
post = find_post_from_params
render_serialized(post.reply_history(params[:max_replies].to_i), PostSerializer)
end
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def destroy
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post = find_post_from_params
if too_late_to(:delete_post, post)
render json: {errors: [I18n.t('too_late_to_edit')]}, status: 422
return
end
guardian.ensure_can_delete!(post)
destroyer = PostDestroyer.new(current_user, post, { context: params[:context] })
destroyer.destroy
render nothing: true
end
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def expand_embed
render json: {cooked: TopicEmbed.expanded_for(find_post_from_params) }
rescue
render_json_error I18n.t('errors.embed.load_from_remote')
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end
def recover
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post = find_post_from_params
guardian.ensure_can_recover_post!(post)
destroyer = PostDestroyer.new(current_user, post)
destroyer.recover
post.reload
render_post_json(post)
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end
def destroy_many
params.require(:post_ids)
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posts = Post.where(id: post_ids_including_replies)
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raise Discourse::InvalidParameters.new(:post_ids) if posts.blank?
# Make sure we can delete the posts
posts.each {|p| guardian.ensure_can_delete!(p) }
Post.transaction do
posts.each {|p| PostDestroyer.new(current_user, p).destroy }
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end
render nothing: true
end
# Direct replies to this post
def replies
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post = find_post_from_params
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render_serialized(post.replies, PostSerializer)
end
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def revisions
post_revision = find_post_revision_from_params
post_revision_serializer = PostRevisionSerializer.new(post_revision, scope: guardian, root: false)
render_json_dump(post_revision_serializer)
end
def latest_revision
post_revision = find_latest_post_revision_from_params
post_revision_serializer = PostRevisionSerializer.new(post_revision, scope: guardian, root: false)
render_json_dump(post_revision_serializer)
end
def hide_revision
post_revision = find_post_revision_from_params
guardian.ensure_can_hide_post_revision!(post_revision)
post_revision.hide!
post = find_post_from_params
post.public_version -= 1
post.save
render nothing: true
end
def show_revision
post_revision = find_post_revision_from_params
guardian.ensure_can_show_post_revision!(post_revision)
post_revision.show!
post = find_post_from_params
post.public_version += 1
post.save
render nothing: true
end
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def bookmark
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post = find_post_from_params
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if current_user
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if params[:bookmarked] == "true"
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PostAction.act(current_user, post, PostActionType.types[:bookmark])
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else
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PostAction.remove_act(current_user, post, PostActionType.types[:bookmark])
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end
end
render nothing: true
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end
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def wiki
guardian.ensure_can_wiki!
post = find_post_from_params
post.revise(current_user, { wiki: params[:wiki] })
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render nothing: true
end
def post_type
guardian.ensure_can_change_post_type!
post = find_post_from_params
post.revise(current_user, { post_type: params[:post_type].to_i })
render nothing: true
end
def rebake
guardian.ensure_can_rebake!
post = find_post_from_params
post.rebake!(invalidate_oneboxes: true)
render nothing: true
end
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def unhide
post = find_post_from_params
guardian.ensure_can_unhide!(post)
post.unhide!
render nothing: true
end
def flagged_posts
params.permit(:offset, :limit)
guardian.ensure_can_see_flagged_posts!
user = fetch_user_from_params
offset = [params[:offset].to_i, 0].max
limit = [(params[:limit] || 60).to_i, 100].min
posts = user_posts(user.id, offset, limit)
.where(id: PostAction.where(post_action_type_id: PostActionType.notify_flag_type_ids)
.where(disagreed_at: nil)
.select(:post_id))
render_serialized(posts, AdminPostSerializer)
end
def deleted_posts
params.permit(:offset, :limit)
guardian.ensure_can_see_deleted_posts!
user = fetch_user_from_params
offset = [params[:offset].to_i, 0].max
limit = [(params[:limit] || 60).to_i, 100].min
posts = user_posts(user.id, offset, limit)
.where(user_deleted: false)
.where.not(deleted_by_id: user.id)
.where.not(deleted_at: nil)
render_serialized(posts, AdminPostSerializer)
end
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protected
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def find_post_revision_from_params
post_id = params[:id] || params[:post_id]
revision = params[:revision].to_i
raise Discourse::InvalidParameters.new(:revision) if revision < 2
post_revision = PostRevision.find_by(post_id: post_id, number: revision)
raise Discourse::NotFound unless post_revision
post_revision.post = find_post_from_params
guardian.ensure_can_see!(post_revision)
post_revision
end
def find_latest_post_revision_from_params
post_id = params[:id] || params[:post_id]
finder = PostRevision.where(post_id: post_id).order(:number)
finder = finder.where(hidden: false) unless guardian.is_staff?
post_revision = finder.last
raise Discourse::NotFound unless post_revision
post_revision.post = find_post_from_params
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guardian.ensure_can_see!(post_revision)
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post_revision
end
private
def user_posts(user_id, offset=0, limit=60)
Post.includes(:user, :topic, :deleted_by, :user_actions)
.with_deleted
.where(user_id: user_id)
.order(created_at: :desc)
.offset(offset)
.limit(limit)
end
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def params_key(params)
"post##" << Digest::SHA1.hexdigest(params
.to_a
.concat([["user", current_user.id]])
.sort{|x,y| x[0] <=> y[0]}.join do |x,y|
"#{x}:#{y}"
end)
end
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def create_params
permitted = [
:raw,
:topic_id,
:title,
:archetype,
:category,
:target_usernames,
:reply_to_post_number,
:auto_track
]
# param munging for WordPress
params[:auto_track] = !(params[:auto_track].to_s == "false") if params[:auto_track]
if api_key_valid?
# php seems to be sending this incorrectly, don't fight with it
params[:skip_validations] = params[:skip_validations].to_s == "true"
permitted << :skip_validations
# We allow `embed_url` via the API
permitted << :embed_url
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end
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params.require(:raw)
result = params.permit(*permitted).tap do |whitelisted|
whitelisted[:image_sizes] = params[:image_sizes]
# TODO this does not feel right, we should name what meta_data is allowed
whitelisted[:meta_data] = params[:meta_data]
end
# Staff are allowed to pass `is_warning`
if current_user.staff?
params.permit(:is_warning)
result[:is_warning] = (params[:is_warning] == "true")
end
# Enable plugins to whitelist additional parameters they might need
DiscourseEvent.trigger(:permit_post_params, result, params)
result
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end
def too_late_to(action, post)
!guardian.send("can_#{action}?", post) && post.user_id == current_user.id && post.edit_time_limit_expired?
end
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def display_post(post)
post.revert_to(params[:version].to_i) if params[:version].present?
render_post_json(post)
end
def find_post_from_params
by_id_finder = Post.where(id: params[:id] || params[:post_id])
find_post_using(by_id_finder)
end
def find_post_from_params_by_number
by_number_finder = Post.where(topic_id: params[:topic_id], post_number: params[:post_number])
find_post_using(by_number_finder)
end
def find_post_using(finder)
# Include deleted posts if the user is staff
finder = finder.with_deleted if current_user.try(:staff?)
post = finder.first
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raise Discourse::NotFound unless post
# load deleted topic
post.topic = Topic.with_deleted.find(post.topic_id) if current_user.try(:staff?)
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guardian.ensure_can_see!(post)
post
end
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end