""" Django module for Course Metadata class -- manages advanced settings and related parameters """ from datetime import datetime import six from crum import get_current_user from django.core.exceptions import ValidationError from django.conf import settings from django.utils.translation import ugettext as _ import pytz from six import text_type from xblock.fields import Scope from cms.djangoapps.contentstore.config.waffle import ENABLE_PROCTORING_PROVIDER_OVERRIDES from openedx.features.course_experience import COURSE_ENABLE_UNENROLLED_ACCESS_FLAG from student.roles import GlobalStaff from xblock_django.models import XBlockStudioConfigurationFlag from xmodule.modulestore.django import modulestore class CourseMetadata(object): ''' For CRUD operations on metadata fields which do not have specific editors on the other pages including any user generated ones. The objects have no predefined attrs but instead are obj encodings of the editable metadata. ''' # The list of fields that wouldn't be shown in Advanced Settings. # Should not be used directly. Instead the get_exclude_list_of_fields method should # be used if the field needs to be filtered depending on the feature flag. FIELDS_EXCLUDE_LIST = [ 'cohort_config', 'xml_attributes', 'start', 'end', 'enrollment_start', 'enrollment_end', 'certificate_available_date', 'tabs', 'graceperiod', 'show_timezone', 'format', 'graded', 'hide_from_toc', 'pdf_textbooks', 'user_partitions', 'name', # from xblock 'tags', # from xblock 'visible_to_staff_only', 'group_access', 'pre_requisite_courses', 'entrance_exam_enabled', 'entrance_exam_minimum_score_pct', 'entrance_exam_id', 'is_entrance_exam', 'in_entrance_exam', 'language', 'certificates', 'minimum_grade_credit', 'default_time_limit_minutes', 'is_proctored_enabled', 'is_time_limited', 'is_practice_exam', 'exam_review_rules', 'hide_after_due', 'self_paced', 'show_correctness', 'chrome', 'default_tab', 'highlights_enabled_for_messaging', 'is_onboarding_exam', ] @classmethod def get_exclude_list_of_fields(cls, course_key): """ Returns a list of fields to exclude from the Studio Advanced settings based on a feature flag (i.e. enabled or disabled). """ # Copy the filtered list to avoid permanently changing the class attribute. exclude_list = list(cls.FIELDS_EXCLUDE_LIST) # Do not show giturl if feature is not enabled. if not settings.FEATURES.get('ENABLE_EXPORT_GIT'): exclude_list.append('giturl') # Do not show edxnotes if the feature is disabled. if not settings.FEATURES.get('ENABLE_EDXNOTES'): exclude_list.append('edxnotes') # Do not show video auto advance if the feature is disabled if not settings.FEATURES.get('ENABLE_OTHER_COURSE_SETTINGS'): exclude_list.append('other_course_settings') # Do not show video_upload_pipeline if the feature is disabled. if not settings.FEATURES.get('ENABLE_VIDEO_UPLOAD_PIPELINE'): exclude_list.append('video_upload_pipeline') # Do not show video auto advance if the feature is disabled if not settings.FEATURES.get('ENABLE_AUTOADVANCE_VIDEOS'): exclude_list.append('video_auto_advance') # Do not show social sharing url field if the feature is disabled. if (not hasattr(settings, 'SOCIAL_SHARING_SETTINGS') or not getattr(settings, 'SOCIAL_SHARING_SETTINGS', {}).get("CUSTOM_COURSE_URLS")): exclude_list.append('social_sharing_url') # Do not show teams configuration if feature is disabled. if not settings.FEATURES.get('ENABLE_TEAMS'): exclude_list.append('teams_configuration') if not settings.FEATURES.get('ENABLE_VIDEO_BUMPER'): exclude_list.append('video_bumper') # Do not show enable_ccx if feature is not enabled. if not settings.FEATURES.get('CUSTOM_COURSES_EDX'): exclude_list.append('enable_ccx') exclude_list.append('ccx_connector') # Do not show "Issue Open Badges" in Studio Advanced Settings # if the feature is disabled. if not settings.FEATURES.get('ENABLE_OPENBADGES'): exclude_list.append('issue_badges') # If the XBlockStudioConfiguration table is not being used, there is no need to # display the "Allow Unsupported XBlocks" setting. if not XBlockStudioConfigurationFlag.is_enabled(): exclude_list.append('allow_unsupported_xblocks') # If the ENABLE_PROCTORING_PROVIDER_OVERRIDES waffle flag is not enabled, # do not show "Proctoring Configuration" in Studio Advanced Settings. if not ENABLE_PROCTORING_PROVIDER_OVERRIDES.is_enabled(course_key): exclude_list.append('proctoring_provider') # Do not show "Course Visibility For Unenrolled Learners" in Studio Advanced Settings # if the enable_anonymous_access flag is not enabled if not COURSE_ENABLE_UNENROLLED_ACCESS_FLAG.is_enabled(course_key=course_key): exclude_list.append('course_visibility') # Do not show "Create Zendesk Tickets For Suspicious Proctored Exam Attempts" in # Studio Advanced Settings if the user is not edX staff. if not GlobalStaff().has_user(get_current_user()): exclude_list.append('create_zendesk_tickets') # Do not show "Proctortrack Exam Escalation Contact" if Proctortrack is not # an available proctoring backend. if not settings.PROCTORING_BACKENDS or settings.PROCTORING_BACKENDS.get('proctortrack') is None: exclude_list.append('proctoring_escalation_email') return exclude_list @classmethod def fetch(cls, descriptor): """ Fetch the key:value editable course details for the given course from persistence and return a CourseMetadata model. """ result = {} metadata = cls.fetch_all(descriptor) exclude_list_of_fields = cls.get_exclude_list_of_fields(descriptor.id) for key, value in six.iteritems(metadata): if key in exclude_list_of_fields: continue result[key] = value return result @classmethod def fetch_all(cls, descriptor): """ Fetches all key:value pairs from persistence and returns a CourseMetadata model. """ result = {} for field in descriptor.fields.values(): if field.scope != Scope.settings: continue field_help = _(field.help) help_args = field.runtime_options.get('help_format_args') if help_args is not None: field_help = field_help.format(**help_args) result[field.name] = { 'value': field.read_json(descriptor), 'display_name': _(field.display_name), 'help': field_help, 'deprecated': field.runtime_options.get('deprecated', False), 'hide_on_enabled_publisher': field.runtime_options.get('hide_on_enabled_publisher', False) } return result @classmethod def update_from_json(cls, descriptor, jsondict, user, filter_tabs=True): """ Decode the json into CourseMetadata and save any changed attrs to the db. Ensures none of the fields are in the exclude list. """ exclude_list_of_fields = cls.get_exclude_list_of_fields(descriptor.id) # Don't filter on the tab attribute if filter_tabs is False. if not filter_tabs: exclude_list_of_fields.remove("tabs") # Validate the values before actually setting them. key_values = {} for key, model in six.iteritems(jsondict): # should it be an error if one of the filtered list items is in the payload? if key in exclude_list_of_fields: continue try: val = model['value'] if hasattr(descriptor, key) and getattr(descriptor, key) != val: key_values[key] = descriptor.fields[key].from_json(val) except (TypeError, ValueError) as err: raise ValueError(_(u"Incorrect format for field '{name}'. {detailed_message}").format( name=model['display_name'], detailed_message=text_type(err))) return cls.update_from_dict(key_values, descriptor, user) @classmethod def validate_and_update_from_json(cls, descriptor, jsondict, user, filter_tabs=True): """ Validate the values in the json dict (validated by xblock fields from_json method) If all fields validate, go ahead and update those values on the object and return it without persisting it to the DB. If not, return the error objects list. Returns: did_validate: whether values pass validation or not errors: list of error objects result: the updated course metadata or None if error """ exclude_list_of_fields = cls.get_exclude_list_of_fields(descriptor.id) if not filter_tabs: exclude_list_of_fields.remove("tabs") filtered_dict = dict((k, v) for k, v in six.iteritems(jsondict) if k not in exclude_list_of_fields) did_validate = True errors = [] key_values = {} updated_data = None for key, model in six.iteritems(filtered_dict): try: val = model['value'] if hasattr(descriptor, key) and getattr(descriptor, key) != val: key_values[key] = descriptor.fields[key].from_json(val) except (TypeError, ValueError, ValidationError) as err: did_validate = False errors.append({'message': text_type(err), 'model': model}) proctoring_errors = cls._validate_proctoring_settings(descriptor, filtered_dict, user) if proctoring_errors: errors = errors + proctoring_errors did_validate = False # If did validate, go ahead and update the metadata if did_validate: updated_data = cls.update_from_dict(key_values, descriptor, user, save=False) return did_validate, errors, updated_data @classmethod def update_from_dict(cls, key_values, descriptor, user, save=True): """ Update metadata descriptor from key_values. Saves to modulestore if save is true. """ for key, value in six.iteritems(key_values): setattr(descriptor, key, value) if save and key_values: modulestore().update_item(descriptor, user.id) return cls.fetch(descriptor) @classmethod def _validate_proctoring_settings(cls, descriptor, settings_dict, user): """ Verify proctoring settings Returns a list of error objects """ errors = [] # If the user is not edX staff, the user has requested a change to the proctoring_provider # Advanced Setting, and it is after course start, prevent the user from changing the # proctoring provider. proctoring_provider_model = settings_dict.get('proctoring_provider', {}) if ( not user.is_staff and cls._has_requested_proctoring_provider_changed( descriptor.proctoring_provider, proctoring_provider_model.get('value') ) and datetime.now(pytz.UTC) > descriptor.start ): message = ( 'The proctoring provider cannot be modified after a course has started.' ' Contact {support_email} for assistance' ).format(support_email=settings.PARTNER_SUPPORT_EMAIL or 'support') errors.append({'message': message, 'model': proctoring_provider_model}) # Require a valid escalation email if Proctortrack is chosen as the proctoring provider escalation_email_model = settings_dict.get('proctoring_escalation_email') if escalation_email_model: escalation_email = escalation_email_model.get('value') else: escalation_email = descriptor.proctoring_escalation_email missing_escalation_email_msg = 'Provider \'{provider}\' requires an exam escalation contact.' if proctoring_provider_model and proctoring_provider_model.get('value') == 'proctortrack': if not escalation_email: message = missing_escalation_email_msg.format(provider=proctoring_provider_model.get('value')) errors.append({'message': message, 'model': proctoring_provider_model}) if ( escalation_email_model and not proctoring_provider_model and descriptor.proctoring_provider == 'proctortrack' ): if not escalation_email: message = missing_escalation_email_msg.format(provider=descriptor.proctoring_provider) errors.append({'message': message, 'model': escalation_email_model}) return errors @staticmethod def _has_requested_proctoring_provider_changed(current_provider, requested_provider): """ Return whether the requested proctoring provider is different than the current proctoring provider, indicating that the user has requested a change to the proctoring_provider Advanced Setting. The requested_provider will be None if the proctoring_provider setting is not available (e.g. if the ENABLE_PROCTORING_PROVIDER_OVERRIDES waffle flag is not enabled for the course). In this case, we consider that there is no change in the requested proctoring provider. """ if requested_provider is None: return False else: return current_provider != requested_provider