discourse/app/controllers/user_avatars_controller.rb

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require_dependency 'letter_avatar'
class UserAvatarsController < ApplicationController
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DOT = Base64.decode64("R0lGODlhAQABALMAAAAAAIAAAACAAICAAAAAgIAAgACAgMDAwICAgP8AAAD/AP//AAAA//8A/wD//wBiZCH5BAEAAA8ALAAAAAABAAEAAAQC8EUAOw==")
skip_before_filter :redirect_to_login_if_required, :check_xhr, :verify_authenticity_token, only: [:show, :show_letter]
def refresh_gravatar
user = User.find_by(username_lower: params[:username].downcase)
guardian.ensure_can_edit!(user)
if user
user.create_user_avatar(user_id: user.id) unless user.user_avatar
user.user_avatar.update_gravatar!
render json: {upload_id: user.user_avatar.gravatar_upload_id}
else
raise Discourse::NotFound
end
end
def show_letter
params.require(:username)
params.require(:version)
params.require(:size)
if params[:version].to_i > LetterAvatar::VERSION
return render_dot
end
image = LetterAvatar.generate(params[:username].to_s, params[:size].to_i)
expires_in 1.year, public: true
send_file image, disposition: nil
end
def show
# we need multisite support to keep a single origin pull for CDNs
RailsMultisite::ConnectionManagement.with_hostname(params[:hostname]) do
show_in_site(RailsMultisite::ConnectionManagement.current_hostname)
end
end
protected
def show_in_site(hostname)
username = params[:username].to_s
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return render_dot unless user = User.find_by(username_lower: username.downcase)
size = params[:size].to_i
if size > 1000 || size < 1
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return render_dot
end
image = nil
version = params[:version].to_i
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return render_dot unless version > 0 && user_avatar = user.user_avatar
upload = Upload.find(version) if user_avatar.contains_upload?(version)
upload ||= user.uploaded_avatar if user.uploaded_avatar_id == version
if user.uploaded_avatar && !upload
return redirect_to "/avatar/#{hostname}/#{user.username_lower}/#{size}/#{user.uploaded_avatar_id}.png"
elsif upload
original = Discourse.store.path_for(upload)
if Discourse.store.external? || File.exists?(original)
optimized = get_optimized_image(upload, size)
if Discourse.store.external?
expires_in 1.day, public: true
return redirect_to optimized.url
end
image = Discourse.store.path_for(optimized)
end
end
if image
expires_in 1.year, public: true
send_file image, disposition: nil
else
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render_dot
end
end
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# this protects us from a DoS
def render_dot
expires_in 10.minutes, public: true
render text: DOT, content_type: "image/png"
end
def get_optimized_image(upload, size)
OptimizedImage.create_for(
upload,
size,
size,
allow_animation: SiteSetting.allow_animated_avatars
)
end
end