629 lines
23 KiB
Ruby
629 lines
23 KiB
Ruby
#
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# Copyright (C) 2011 - 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 Api
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include Api::Errors::ControllerMethods
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# find id in collection, by either id or sis_*_id
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# if the collection is over the users table, `self` is replaced by @current_user.id
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def api_find(collection, id, account: nil)
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result = api_find_all(collection, [id], account: account).first
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raise(ActiveRecord::RecordNotFound, "Couldn't find #{collection.name} with API id '#{id}'") unless result
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result
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end
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def api_find_all(collection, ids, account: nil)
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if collection.table_name == User.table_name && @current_user
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ids = ids.map{|id| id == 'self' ? @current_user.id : id }
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end
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if collection.table_name == Account.table_name
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ids = ids.map do |id|
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case id
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when 'self'
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@domain_root_account.id
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when 'default'
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Account.default.id
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when 'site_admin'
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Account.site_admin.id
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else
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id
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end
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end
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end
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if collection.table_name == EnrollmentTerm.table_name
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current_term = nil
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ids = ids.map do |id|
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case id
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when 'default'
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@domain_root_account.default_enrollment_term
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when 'current'
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if !current_term
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current_terms = @domain_root_account
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.enrollment_terms
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.active
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.where("(start_at<=? OR start_at IS NULL) AND (end_at >=? OR end_at IS NULL) AND NOT (start_at IS NULL AND end_at IS NULL)", Time.now.utc, Time.now.utc)
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.limit(2)
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.to_a
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current_term = current_terms.length == 1 ? current_terms.first : :nil
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end
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current_term == :nil ? nil : current_term
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else
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id
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end
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end
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end
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Api.sis_relation_for_collection(collection, ids, account || @domain_root_account, @current_user)
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end
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# map a list of ids and/or sis ids to plain ids.
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# sis ids that can't be found in the db won't appear in the result, however
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# AR object ids aren't verified to exist in the db so they'll still be
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# returned in the result.
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def self.map_ids(ids, collection, root_account, current_user = nil)
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sis_mapping = sis_find_sis_mapping_for_collection(collection)
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columns = sis_parse_ids(ids, sis_mapping[:lookups], current_user)
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result = columns.delete(sis_mapping[:lookups]["id"]) || []
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unless columns.empty?
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relation = relation_for_sis_mapping_and_columns(collection, columns, sis_mapping, root_account)
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# pluck ignores eager_load
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relation = relation.joins(*relation.eager_load_values) if relation.eager_load_values.present?
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result.concat relation.pluck(:id)
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result.uniq!
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end
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result
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end
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SIS_MAPPINGS = {
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'courses' =>
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{ :lookups => { 'sis_course_id' => 'sis_source_id',
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'id' => 'id',
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'sis_integration_id' => 'integration_id',
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'lti_context_id' => 'lti_context_id' }.freeze,
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:is_not_scoped_to_account => ['id'].freeze,
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:scope => 'root_account_id' }.freeze,
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'enrollment_terms' =>
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{ :lookups => { 'sis_term_id' => 'sis_source_id',
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'id' => 'id',
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'sis_integration_id' => 'integration_id' }.freeze,
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:is_not_scoped_to_account => ['id'].freeze,
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:scope => 'root_account_id' }.freeze,
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'users' =>
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{ :lookups => { 'sis_user_id' => 'pseudonyms.sis_user_id',
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'sis_login_id' => {
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column: 'LOWER(pseudonyms.unique_id)',
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transform: ->(id) { QuotedValue.new("LOWER(#{Pseudonym.connection.quote(id)})") }
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},
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'id' => 'users.id',
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'sis_integration_id' => 'pseudonyms.integration_id',
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'lti_context_id' => 'users.lti_context_id',
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'lti_user_id' => 'users.lti_context_id' }.freeze,
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:is_not_scoped_to_account => ['users.id', 'users.lti_context_id'].freeze,
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:scope => 'pseudonyms.account_id',
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:joins => :pseudonym }.freeze,
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'accounts' =>
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{ :lookups => { 'sis_account_id' => 'sis_source_id',
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'id' => 'id',
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'sis_integration_id' => 'integration_id',
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'lti_context_id' => 'lti_context_id' }.freeze,
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:is_not_scoped_to_account => ['id', 'lti_context_id'].freeze,
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:scope => 'root_account_id' }.freeze,
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'course_sections' =>
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{ :lookups => { 'sis_section_id' => 'sis_source_id',
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'id' => 'id',
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'sis_integration_id' => 'integration_id' }.freeze,
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:is_not_scoped_to_account => ['id'].freeze,
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:scope => 'root_account_id' }.freeze,
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'groups' =>
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{ :lookups => { 'sis_group_id' => 'sis_source_id',
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'id' => 'id' }.freeze,
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:is_not_scoped_to_account => ['id'].freeze,
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:scope => 'root_account_id' }.freeze,
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}.freeze
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# (digits in 2**63-1) - 1, so that any ID representable in MAX_ID_LENGTH
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# digits is < 2**63, which is the max signed 64-bit integer, which is what's
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# used for the DB ids.
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MAX_ID_LENGTH = 18
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ID_REGEX = %r{\A\d{1,#{MAX_ID_LENGTH}}\z}
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def self.sis_parse_id(id, lookups, _current_user = nil)
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# returns column_name, column_value
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return lookups['id'], id if id.is_a?(Numeric) || id.is_a?(ActiveRecord::Base)
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id = id.to_s.strip
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if id =~ %r{\Ahex:(lti_[\w_]+|sis_[\w_]+):(([0-9A-Fa-f]{2})+)\z}
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sis_column = $1
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sis_id = [$2].pack('H*')
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elsif id =~ %r{\A(lti_[\w_]+|sis_[\w_]+):(.+)\z}
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sis_column = $1
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sis_id = $2
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elsif id =~ ID_REGEX
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return lookups['id'], (id =~ /\A\d+\z/ ? id.to_i : id)
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else
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return nil, nil
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end
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column = lookups[sis_column]
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return nil, nil unless column
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if column.is_a?(Hash)
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sis_id = column[:transform].call(sis_id)
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column = column[:column]
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end
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return column, sis_id
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end
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def self.sis_parse_ids(ids, lookups, current_user = nil)
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# returns {column_name => [column_value,...].uniq, ...}
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columns = {}
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ids.compact.each do |id|
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column, sis_id = sis_parse_id(id, lookups, current_user)
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next unless column && sis_id
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columns[column] ||= []
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columns[column] << sis_id
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end
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columns.keys.each { |key| columns[key].uniq! }
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return columns
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end
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# remove things that don't look like valid database IDs
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# return in integer format if possible
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# (note that ID_REGEX may be redefined by a plugin!)
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def self.map_non_sis_ids(ids)
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ids.map{ |id| id.to_s.strip }.select{ |id| id =~ ID_REGEX }.map do |id|
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id =~ /\A\d+\z/ ? id.to_i : id
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end
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end
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def self.sis_find_sis_mapping_for_collection(collection)
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SIS_MAPPINGS[collection.table_name] or
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raise(ArgumentError, "need to add support for table name: #{collection.table_name}")
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end
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def self.sis_relation_for_collection(collection, ids, sis_root_account, current_user = nil)
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relation_for_sis_mapping(collection,
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sis_find_sis_mapping_for_collection(collection),
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ids,
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sis_root_account,
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current_user)
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end
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def self.relation_for_sis_mapping(relation, sis_mapping, ids, sis_root_account, current_user = nil)
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relation_for_sis_mapping_and_columns(relation,
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sis_parse_ids(ids, sis_mapping[:lookups], current_user),
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sis_mapping,
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sis_root_account)
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end
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def self.relation_for_sis_mapping_and_columns(relation, columns, sis_mapping, sis_root_account)
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raise ArgumentError, "sis_root_account required for lookups" unless sis_root_account.is_a?(Account)
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return relation.none if columns.empty?
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not_scoped_to_account = sis_mapping[:is_not_scoped_to_account] || []
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if columns.length == 1 && not_scoped_to_account.include?(columns.keys.first)
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relation = relation.where(columns)
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else
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args = []
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query = []
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columns.keys.sort.each do |column|
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if not_scoped_to_account.include?(column)
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query << "#{column} IN (?)"
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args << columns[column]
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else
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raise ArgumentError, "missing scope for collection" unless sis_mapping[:scope]
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ids = columns[column]
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if ids.any? { |id| id.is_a?(Array) }
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ids_hash = {}
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ids.each do |id|
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id = Array(id)
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account = id.last || sis_root_account
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ids_hash[account] ||= []
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ids_hash[account] << id.first
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end
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else
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ids_hash = { sis_root_account => ids }
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end
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ids_hash.each do |root_account, ids|
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query << "(#{sis_mapping[:scope]} = #{root_account.id} AND #{column} IN (?))"
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args << ids
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end
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end
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end
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args.unshift(query.join(" OR "))
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relation = relation.where(*args)
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end
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relation = relation.eager_load(sis_mapping[:joins]) if sis_mapping[:joins]
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relation
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end
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def self.max_per_page
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Setting.get('api_max_per_page', '50').to_i
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end
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def self.per_page
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Setting.get('api_per_page', '10').to_i
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end
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def self.per_page_for(controller, options={})
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per_page_requested = controller.params[:per_page] || options[:default] || per_page
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max = options[:max] || max_per_page
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[[per_page_requested.to_i, 1].max, max.to_i].min
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end
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# Add [link HTTP Headers](http://www.w3.org/Protocols/9707-link-header.html) for pagination
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# The collection needs to be a will_paginate collection (or act like one)
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# a new, paginated collection will be returned
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def self.paginate(collection, controller, base_url, pagination_args = {}, response_args = {})
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collection = paginate_collection!(collection, controller, pagination_args)
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hash = build_links_hash(base_url, meta_for_pagination(controller, collection))
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links = build_links_from_hash(hash)
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controller.response.headers["Link"] = links.join(',') if links.length > 0
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if response_args[:enhanced_return]
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{hash: hash, collection: collection}
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else
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collection
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end
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end
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# Returns collection as the first return value, and the meta information hash
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# as the second return value
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def self.jsonapi_paginate(collection, controller, base_url, pagination_args={})
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collection = paginate_collection!(collection, controller, pagination_args)
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meta = jsonapi_meta(collection, controller, base_url)
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return collection, meta
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end
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def self.jsonapi_meta(collection, controller, base_url)
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pagination = meta_for_pagination(controller, collection)
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meta = {
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per_page: collection.per_page
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}
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meta.merge!(build_links_hash(base_url, pagination))
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if collection.ordinal_pages?
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meta[:page] = pagination[:current]
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meta[:template] = meta[:current].sub(/page=\d+/, "page={page}")
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end
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meta[:count] = collection.total_entries if collection.total_entries
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meta[:page_count] = collection.total_pages if collection.total_pages
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{ pagination: meta }
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end
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def self.paginate_collection!(collection, controller, pagination_args)
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wrap_pagination_args!(pagination_args, controller)
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begin
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paginated = collection.paginate(pagination_args)
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rescue Folio::InvalidPage
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if pagination_args[:page].to_s =~ /\d+/ && pagination_args[:page].to_i > 0 && collection.build_page.ordinal_pages?
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# for backwards compatibility we currently require returning [] for
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# pages beyond the end of an ordinal collection, rather than a 404.
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paginated = Folio::Ordinal::Page.create
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paginated.current_page = pagination_args[:page].to_i
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else
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# we're not dealing with a simple out-of-bounds on an ordinal
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# collection, let the exception propagate (and turn into a 404)
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raise
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end
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end
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paginated
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end
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def self.wrap_pagination_args!(pagination_args, controller)
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pagination_args.reverse_merge!(
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page: controller.params[:page],
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per_page: per_page_for(controller,
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default: pagination_args.delete(:default_per_page),
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max: pagination_args.delete(:max_per_page)))
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end
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def self.meta_for_pagination(controller, collection)
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{
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query_parameters: controller.request.query_parameters,
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per_page: collection.per_page,
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current: collection.current_page,
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next: collection.next_page,
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prev: collection.previous_page,
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first: collection.first_page,
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last: collection.last_page,
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}
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end
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PAGINATION_PARAMS = [:current, :next, :prev, :first, :last]
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EXCLUDE_IN_PAGINATION_LINKS = %w(page per_page access_token api_key)
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def self.build_links(base_url, opts={})
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links = build_links_hash(base_url, opts)
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build_links_from_hash(links)
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end
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def self.build_links_from_hash(links)
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# iterate in order, but only using the keys present from build_links_hash
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(PAGINATION_PARAMS & links.keys).map do |k|
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v = links[k]
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"<#{v}>; rel=\"#{k}\""
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end
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end
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def self.build_links_hash(base_url, opts={})
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base_url += (base_url =~ /\?/ ? '&': '?')
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qp = opts[:query_parameters] || {}
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qp = qp.with_indifferent_access.except(*EXCLUDE_IN_PAGINATION_LINKS)
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base_url += "#{qp.to_query}&" if qp.present?
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PAGINATION_PARAMS.each_with_object({}) do |param, obj|
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if opts[param].present?
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obj[param] = "#{base_url}page=#{opts[param]}&per_page=#{opts[:per_page]}"
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end
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end
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end
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def self.parse_pagination_links(link_header)
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link_header.split(",").map do |link|
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url, rel = link.match(%r{^<([^>]+)>; rel="([^"]+)"}).captures
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uri = URI.parse(url)
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raise(ArgumentError, "pagination url is not an absolute uri: #{url}") unless uri.is_a?(URI::HTTP)
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Rack::Utils.parse_nested_query(uri.query).merge(:uri => uri, :rel => rel)
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end
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end
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def media_comment_json(media_object_or_hash)
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media_object_or_hash = OpenStruct.new(media_object_or_hash) if media_object_or_hash.is_a?(Hash)
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{
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'content-type' => "#{media_object_or_hash.media_type}/mp4",
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'display_name' => media_object_or_hash.title.presence || media_object_or_hash.user_entered_title,
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'media_id' => media_object_or_hash.media_id,
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'media_type' => media_object_or_hash.media_type,
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'url' => user_media_download_url(:user_id => @current_user.id,
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:entryId => media_object_or_hash.media_id,
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:type => "mp4",
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:redirect => "1")
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}
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end
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def api_bulk_load_user_content_attachments(htmls, context = nil)
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regex = context ? %r{/#{context.class.name.tableize}/#{context.id}/files/(\d+)} : %r{/files/(\d+)}
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attachment_ids = []
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htmls.compact.each do |html|
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html.scan(regex).each do |match|
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attachment_ids << match.first
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end
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end
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if attachment_ids.blank?
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{}
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else
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attachments = if context.is_a?(User) || context.nil?
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Attachment.where(id: attachment_ids)
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else
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context.attachments.where(id: attachment_ids)
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end
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attachments.preload(:context).index_by(&:id)
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end
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end
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PLACEHOLDER_PROTOCOL = 'https'
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PLACEHOLDER_HOST = 'placeholder.invalid'
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def get_host_and_protocol_from_request
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[ request.host_with_port, request.ssl? ? 'https' : 'http' ]
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end
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def resolve_placeholders(content)
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host, protocol = get_host_and_protocol_from_request
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# content is a json-encoded string; slashes are escaped (at least in Rails 4.0)
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content.gsub("#{PLACEHOLDER_PROTOCOL}:\\/\\/#{PLACEHOLDER_HOST}", "#{protocol}:\\/\\/#{host}").
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gsub("#{PLACEHOLDER_PROTOCOL}://#{PLACEHOLDER_HOST}", "#{protocol}://#{host}")
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end
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def user_can_download_attachment?(attachment, context, user)
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# checking on the context first can improve performance when checking many attachments for admins
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(context && context.grants_any_right?(user, :manage_files, :read_as_admin)) || attachment.grants_right?(user, nil, :download)
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end
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def api_user_content(html, context = @context, user = @current_user, preloaded_attachments = {}, is_public=false)
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return html if html.blank?
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# use the host of the request if available;
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# use a placeholder host for pre-generated content, which we will replace with the request host when available;
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# otherwise let HostUrl figure out what host is appropriate
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if self.respond_to?(:request)
|
|
host, protocol = get_host_and_protocol_from_request
|
|
elsif self.respond_to?(:use_placeholder_host?) && use_placeholder_host?
|
|
host = PLACEHOLDER_HOST
|
|
protocol = PLACEHOLDER_PROTOCOL
|
|
else
|
|
host = HostUrl.context_host(context, @account_domain.try(:host))
|
|
protocol = HostUrl.protocol
|
|
end
|
|
|
|
rewriter = UserContent::HtmlRewriter.new(context, user)
|
|
rewriter.set_handler('files') do |match|
|
|
if match.obj_id
|
|
obj = preloaded_attachments[match.obj_id]
|
|
obj ||= if context.is_a?(User) || context.nil?
|
|
Attachment.where(id: match.obj_id).first
|
|
else
|
|
context.attachments.find_by_id(match.obj_id)
|
|
end
|
|
end
|
|
|
|
unless obj && !obj.deleted? && ((is_public && !obj.locked_for?(user)) || user_can_download_attachment?(obj, context, user))
|
|
if obj && obj.previewable_media? && (uri = URI.parse(match.url) rescue nil)
|
|
uri.query = (uri.query.to_s.split("&") + ["no_preview=1"]).join("&")
|
|
next uri.to_s
|
|
else
|
|
next
|
|
end
|
|
end
|
|
|
|
if ["Course", "Group", "Account", "User"].include?(obj.context_type)
|
|
opts = {:only_path => true}
|
|
opts.merge!(:verifier => obj.uuid) unless respond_to?(:in_app?, true) && in_app? && !is_public
|
|
if match.rest.start_with?("/preview")
|
|
url = self.send("#{obj.context_type.downcase}_file_preview_url", obj.context_id, obj.id, opts)
|
|
else
|
|
opts[:download] = '1'
|
|
opts[:wrap] = '1' if match.rest.include?('wrap=1')
|
|
url = self.send("#{obj.context_type.downcase}_file_download_url", obj.context_id, obj.id, opts)
|
|
end
|
|
else
|
|
opts = {:download => '1', :only_path => true}
|
|
opts.merge!(:verifier => obj.uuid) unless respond_to?(:in_app?, true) && in_app? && !is_public
|
|
url = file_download_url(obj.id, opts)
|
|
end
|
|
url
|
|
end
|
|
html = rewriter.translate_content(html)
|
|
|
|
url_helper = Html::UrlProxy.new(self, context, host, protocol)
|
|
account = Context.get_account(context) || @domain_root_account
|
|
include_mobile = respond_to?(:mobile_device?, true) && mobile_device?
|
|
Html::Content.rewrite_outgoing(html, account, url_helper, include_mobile: include_mobile)
|
|
end
|
|
|
|
# This removes the verifier parameters that are added to attachment links by api_user_content
|
|
# and adds context (e.g. /courses/:id/) if it is missing
|
|
# exception: it leaves user-context file links alone
|
|
def process_incoming_html_content(html)
|
|
Html::Content.process_incoming(html)
|
|
end
|
|
|
|
def value_to_boolean(value)
|
|
Canvas::Plugin.value_to_boolean(value)
|
|
end
|
|
|
|
# takes a comma separated string, an array, or nil and returns an array
|
|
def self.value_to_array(value)
|
|
value.is_a?(String) ? value.split(',') : (value || [])
|
|
end
|
|
|
|
def self.invalid_time_stamp_error(attribute, message)
|
|
Canvas::Errors.capture(
|
|
'invalid_date_time',
|
|
message: "invalid #{attribute}",
|
|
exception_message: message
|
|
)
|
|
end
|
|
|
|
# regex for valid iso8601 dates
|
|
ISO8601_REGEX = /^(?<year>[0-9]{4})-
|
|
(?<month>1[0-2]|0[1-9])-
|
|
(?<day>3[0-1]|0[1-9]|[1-2][0-9])T
|
|
(?<hour>2[0-3]|[0-1][0-9]):
|
|
(?<minute>[0-5][0-9]):
|
|
(?<second>60|[0-5][0-9])
|
|
(?<fraction>\.[0-9]+)?
|
|
(?<timezone>Z|[+-](?:2[0-3]|[0-1][0-9]):[0-5][0-9])?$/x
|
|
|
|
# regex for valid dates
|
|
DATE_REGEX = /^\d{4}[- \/.](0[1-9]|1[012])[- \/.](0[1-9]|[12][0-9]|3[01])$/
|
|
|
|
# regex for shard-aware ID
|
|
ID = '(?:\d+~)?\d+'
|
|
|
|
# maps a Canvas data type to an API-friendly type name
|
|
API_DATA_TYPE = { "Attachment" => "File",
|
|
"WikiPage" => "Page",
|
|
"DiscussionTopic" => "Discussion",
|
|
"Assignment" => "Assignment",
|
|
"Quizzes::Quiz" => "Quiz",
|
|
"ContextModuleSubHeader" => "SubHeader",
|
|
"ExternalUrl" => "ExternalUrl",
|
|
"ContextExternalTool" => "ExternalTool",
|
|
"ContextModule" => "Module",
|
|
"ContentTag" => "ModuleItem" }.freeze
|
|
|
|
# matches the other direction, case insensitively
|
|
def self.api_type_to_canvas_name(api_type)
|
|
unless @inverse_map
|
|
m = {}
|
|
API_DATA_TYPE.each do |k, v|
|
|
m[v.downcase] = k
|
|
end
|
|
@inverse_map = m
|
|
end
|
|
return nil unless api_type
|
|
@inverse_map[api_type.downcase]
|
|
end
|
|
|
|
def self.recursively_stringify_json_ids(value, opts = {})
|
|
case value
|
|
when Hash
|
|
stringify_json_ids(value, opts)
|
|
value.each_value { |v| recursively_stringify_json_ids(v, opts) if v.is_a?(Hash) || v.is_a?(Array) }
|
|
when Array
|
|
value.each { |v| recursively_stringify_json_ids(v, opts) if v.is_a?(Hash) || v.is_a?(Array) }
|
|
end
|
|
value
|
|
end
|
|
|
|
def self.stringify_json_ids(value, opts = {})
|
|
return unless value.is_a?(Hash)
|
|
value.keys.each do |key|
|
|
if key =~ /(^|_)id$/
|
|
# id, foo_id, etc.
|
|
value[key] = stringify_json_id(value[key], opts)
|
|
elsif key =~ /(^|_)ids$/ && value[key].is_a?(Array)
|
|
# ids, foo_ids, etc.
|
|
value[key].map!{ |id| stringify_json_id(id, opts) }
|
|
end
|
|
end
|
|
end
|
|
|
|
def self.stringify_json_id(id, opts = {})
|
|
if opts[:reverse]
|
|
id.is_a?(String) ? id.to_i : id
|
|
else
|
|
id.is_a?(Integer) ? id.to_s : id
|
|
end
|
|
end
|
|
|
|
def accepts_jsonapi?
|
|
!!(/application\/vnd\.api\+json/ =~ request.headers['Accept'].to_s)
|
|
end
|
|
|
|
# Return a template url that follows the root links key for the jsonapi.org
|
|
# standard.
|
|
#
|
|
def templated_url(method, *args)
|
|
format = /^\{.*\}$/
|
|
placeholder = "PLACEHOLDER"
|
|
|
|
placeholders = args.each_with_index.map do |arg, index|
|
|
arg =~ format ? "#{placeholder}#{index}" : arg
|
|
end
|
|
|
|
url = send(method, *placeholders)
|
|
|
|
args.each_with_index do |arg, index|
|
|
url.sub!("#{placeholder}#{index}", arg) if arg =~ format
|
|
end
|
|
|
|
url
|
|
end
|
|
end
|