80 lines
3.0 KiB
Ruby
80 lines
3.0 KiB
Ruby
#
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# Copyright (C) 2014 Instructure, Inc.
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#
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# This file is part of Canvas.
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#
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# Canvas is free software: you can redistribute it and/or modify it under
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# the terms of the GNU Affero General Public License as published by the Free
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# Software Foundation, version 3 of the License.
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#
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# Canvas is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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# A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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# details.
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#
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# You should have received a copy of the GNU Affero General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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module Lti
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class MessageHandler < ActiveRecord::Base
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BASIC_LTI_LAUNCH_REQUEST = 'basic-lti-launch-request'
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attr_accessible :message_type, :launch_path, :capabilities, :parameters, :resource_handler, :links
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attr_readonly :created_at
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belongs_to :resource_handler, class_name: "Lti::ResourceHandler", :foreign_key => :resource_handler_id
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has_many :links, :class_name => 'Lti::LtiLink'
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has_many :context_module_tags, :as => :content, :class_name => 'ContentTag', :conditions => "content_tags.tag_type='context_module' AND content_tags.workflow_state<>'deleted'", :include => {:context_module => [:content_tags]}
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serialize :capabilities
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serialize :parameters
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validates_presence_of :message_type, :resource_handler, :launch_path
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scope :by_message_types, lambda { |*message_types| where('lti_message_handlers.message_type IN (?)', message_types) }
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scope :for_context, lambda { |context|
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tool_proxies = ToolProxy.find_active_proxies_for_context(context)
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joins(:resource_handler).where('lti_resource_handlers.tool_proxy_id' => tool_proxies)
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}
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scope :has_placements, lambda { |*placements|
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where('EXISTS (
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SELECT * FROM lti_resource_placements
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WHERE lti_message_handlers.resource_handler_id = lti_resource_placements.resource_handler_id
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AND lti_resource_placements.placement IN (?) )', placements)
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}
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def self.lti_apps_tabs(context, placements, opts)
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apps = Lti::MessageHandler.for_context(context).
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has_placements(*placements).
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by_message_types(Lti::MessageHandler::BASIC_LTI_LAUNCH_REQUEST).to_a
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launch_path_helper = case context
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when Course
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:course_basic_lti_launch_request_path
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when Account
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:account_basic_lti_launch_request_path
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end
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apps.sort_by(&:id).map do |app|
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args = {message_handler_id: app.id, resource_link_fragment: "nav"}
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args["#{context.class.name.downcase}_id"] = context.id
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{
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:id => app.asset_string,
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:label => app.resource_handler.name,
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:css_class => app.asset_string,
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:href => launch_path_helper,
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:visibility => nil,
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:external => true,
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:hidden => false,
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:args => args
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}
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end
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end
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end
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end
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