92 lines
2.7 KiB
Ruby
92 lines
2.7 KiB
Ruby
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module Gitlab
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module Middleware
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class ReadOnly
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DISALLOWED_METHODS = %w(POST PATCH PUT DELETE).freeze
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APPLICATION_JSON = 'application/json'.freeze
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API_VERSIONS = (3..4)
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def initialize(app)
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@app = app
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@whitelisted = internal_routes
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end
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def call(env)
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@env = env
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@route_hash = nil
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if disallowed_request? && Gitlab::Database.read_only?
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Rails.logger.debug('GitLab ReadOnly: preventing possible non read-only operation')
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error_message = 'You cannot do writing operations on a read-only GitLab instance'
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if json_request?
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return [403, { 'Content-Type' => 'application/json' }, [{ 'message' => error_message }.to_json]]
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else
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rack_flash.alert = error_message
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rack_session['flash'] = rack_flash.to_session_value
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return [301, { 'Location' => last_visited_url }, []]
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end
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end
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@app.call(env)
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end
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private
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def internal_routes
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API_VERSIONS.flat_map { |version| "api/v#{version}/internal" }
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end
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def disallowed_request?
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DISALLOWED_METHODS.include?(@env['REQUEST_METHOD']) && !whitelisted_routes
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end
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def json_request?
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request.media_type == APPLICATION_JSON
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end
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def rack_flash
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@rack_flash ||= ActionDispatch::Flash::FlashHash.from_session_value(rack_session)
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end
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def rack_session
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@env['rack.session']
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end
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def request
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@env['rack.request'] ||= Rack::Request.new(@env)
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end
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def last_visited_url
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@env['HTTP_REFERER'] || rack_session['user_return_to'] || Gitlab::Routing.url_helpers.root_url
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end
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def route_hash
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@route_hash ||= Rails.application.routes.recognize_path(request.url, { method: request.request_method }) rescue {}
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end
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def whitelisted_routes
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grack_route || @whitelisted.any? { |path| request.path.include?(path) } || lfs_route || sidekiq_route
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end
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def sidekiq_route
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request.path.start_with?('/admin/sidekiq')
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end
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def grack_route
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# Calling route_hash may be expensive. Only do it if we think there's a possible match
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return false unless request.path.end_with?('.git/git-upload-pack')
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route_hash[:controller] == 'projects/git_http' && route_hash[:action] == 'git_upload_pack'
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end
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def lfs_route
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# Calling route_hash may be expensive. Only do it if we think there's a possible match
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return false unless request.path.end_with?('/info/lfs/objects/batch')
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route_hash[:controller] == 'projects/lfs_api' && route_hash[:action] == 'batch'
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end
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end
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end
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end
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