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99 lines
3.0 KiB
Ruby
99 lines
3.0 KiB
Ruby
# frozen_string_literal: true
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class PresenceController < ApplicationController
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skip_before_action :check_xhr
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before_action :ensure_logged_in, only: [:update]
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before_action :skip_persist_session
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MAX_CHANNELS_PER_REQUEST ||= 50
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def get
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names = params.require(:channels)
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if !(names.is_a?(Array) && names.all? { |n| n.is_a? String })
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raise Discourse::InvalidParameters.new(:channels)
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end
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names.uniq!
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if names.length > MAX_CHANNELS_PER_REQUEST
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raise Discourse::InvalidParameters.new("Too many channels")
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end
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user_group_ids =
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if current_user
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GroupUser.where(user_id: current_user.id).pluck("group_id")
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else
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[]
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end
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result = {}
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names.each do |name|
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channel = PresenceChannel.new(name)
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if channel.can_view?(user_id: current_user&.id, group_ids: user_group_ids)
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result[name] = PresenceChannelStateSerializer.new(channel.state, root: nil)
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else
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result[name] = nil
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end
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rescue PresenceChannel::NotFound
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result[name] = nil
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end
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render json: result
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end
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def update
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raise Discourse::ReadOnly if @readonly_mode
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client_id = params[:client_id]
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if !client_id.is_a?(String) || client_id.blank?
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raise Discourse::InvalidParameters.new(:client_id)
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end
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# JS client is designed to throttle to one request per second
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# When no changes are being made, it makes one request every 30 seconds
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RateLimiter.new(nil, "update-presence-#{current_user.id}", 20, 10.seconds).performed!
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present_channels = params[:present_channels]
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if present_channels &&
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!(present_channels.is_a?(Array) && present_channels.all? { |c| c.is_a? String })
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raise Discourse::InvalidParameters.new(:present_channels)
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end
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leave_channels = params[:leave_channels]
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if leave_channels &&
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!(leave_channels.is_a?(Array) && leave_channels.all? { |c| c.is_a? String })
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raise Discourse::InvalidParameters.new(:leave_channels)
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end
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if present_channels && present_channels.length > MAX_CHANNELS_PER_REQUEST
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raise Discourse::InvalidParameters.new("Too many present_channels")
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end
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response = {}
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present_channels&.each do |name|
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PresenceChannel.new(name).present(user_id: current_user&.id, client_id: params[:client_id])
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response[name] = true
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rescue PresenceChannel::NotFound, PresenceChannel::InvalidAccess
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response[name] = false
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end
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leave_channels&.each do |name|
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PresenceChannel.new(name).leave(user_id: current_user&.id, client_id: params[:client_id])
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rescue PresenceChannel::NotFound
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# Do nothing. Don't reveal that this channel doesn't exist
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end
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render json: response
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end
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private
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def skip_persist_session
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# Presence endpoints are often called asynchronously at the same time as other request,
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# and never need to modify the session. Skipping ensures that an unneeded cookie rotation
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# doesn't race against another request and cause issues.
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session.options[:skip] = true
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end
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end
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