import re import uuid from collections import OrderedDict from operator import attrgetter from urllib.parse import unquote from django.apps import apps from django.conf import settings from django.contrib.staticfiles import finders from django.core.urlresolvers import get_resolver from django.db.models import F from django.http import Http404, HttpResponse from django.utils.timezone import now from openslides import __version__ as version from openslides.utils import views as utils_views from openslides.utils.plugins import ( get_plugin_description, get_plugin_verbose_name, get_plugin_version, ) from openslides.utils.rest_api import ( ModelViewSet, ReadOnlyModelViewSet, Response, SimpleMetadata, ValidationError, ViewSet, detail_route, ) from openslides.utils.search import search from .config import config from .exceptions import ConfigError, ConfigNotFound from .models import ChatMessage, CustomSlide, Projector, Tag from .serializers import ( ChatMessageSerializer, CustomSlideSerializer, ProjectorSerializer, TagSerializer, ) # Special Django views class IndexView(utils_views.CSRFMixin, utils_views.View): """ The primary view for OpenSlides using AngularJS. The default base template is 'openslides/core/static/templates/index.html'. You can override it by simply adding a custom 'templates/index.html' file to the custom staticfiles directory. See STATICFILES_DIRS in settings.py. """ def get(self, *args, **kwargs): with open(finders.find('templates/index.html')) as f: content = f.read() return HttpResponse(content) class ProjectorView(utils_views.View): """ The primary view for OpenSlides projector using AngularJS. The default base template is 'openslides/core/static/templates/projector.html'. You can override it by simply adding a custom 'templates/projector.html' file to the custom staticfiles directory. See STATICFILES_DIRS in settings.py. """ def get(self, *args, **kwargs): with open(finders.find('templates/projector.html')) as f: content = f.read() return HttpResponse(content) class AppsJsView(utils_views.View): """ Returns javascript code to be called in the angular app. The javascript code loads all js-files defined by the installed (django) apps and creates the angular modules for each angular app. """ def get(self, *args, **kwargs): angular_modules = [] js_files = [] for app_config in apps.get_app_configs(): # Add the angular app, if the module has one. if getattr(app_config, 'angular_{}_module'.format(kwargs.get('openslides_app')), False): angular_modules.append('OpenSlidesApp.{app_name}.{app}'.format( app=kwargs.get('openslides_app'), app_name=app_config.label)) # Add all js files that the module needs try: app_js_files = app_config.js_files except AttributeError: # The app needs no js-files pass else: js_files += [ '{static}{path}'.format( static=settings.STATIC_URL, path=path) for path in app_js_files] # Use javascript loadScript function from # http://balpha.de/2011/10/jquery-script-insertion-and-its-consequences-for-debugging/ return HttpResponse( """ var loadScript = function (path) { var result = $.Deferred(), script = document.createElement("script"); script.async = "async"; script.type = "text/javascript"; script.src = path; script.onload = script.onreadystatechange = function(_, isAbort) { if (!script.readyState || /loaded|complete/.test(script.readyState)) { if (isAbort) result.reject(); else result.resolve(); } }; script.onerror = function () { result.reject(); }; $("head")[0].appendChild(script); return result.promise(); }; """ + """ angular.module('OpenSlidesApp.{app}', {angular_modules}); var deferres = []; {js_files}.forEach( function(js_file) {{ deferres.push(loadScript(js_file)); }} ); $.when.apply(this,deferres).done(function() {{ angular.bootstrap(document,['OpenSlidesApp.{app}']); }} ); """ .format( app=kwargs.get('openslides_app'), angular_modules=angular_modules, js_files=js_files)) # Viewsets for the REST API class ProjectorViewSet(ReadOnlyModelViewSet): """ API endpoint for the projector slide info. There are the following views: metadata, list, retrieve, activate_elements, prune_elements, update_elements, deactivate_elements, clear_elements and control_view. """ queryset = Projector.objects.all() serializer_class = ProjectorSerializer def check_view_permissions(self): """ Returns True if the user has required permissions. """ if self.action in ('metadata', 'list', 'retrieve'): result = self.request.user.has_perm('core.can_see_projector') elif self.action in ('activate_elements', 'prune_elements', 'update_elements', 'deactivate_elements', 'clear_elements', 'control_view'): result = (self.request.user.has_perm('core.can_see_projector') and self.request.user.has_perm('core.can_manage_projector')) else: result = False return result @detail_route(methods=['post']) def activate_elements(self, request, pk): """ REST API operation to activate projector elements. It expects a POST request to /rest/core/projector//activate_elements/ with a list of dictionaries to be appended to the projector config entry. """ if not isinstance(request.data, list): raise ValidationError({'data': 'Data must be a list.'}) projector_instance = self.get_object() projector_config = projector_instance.config for element in request.data: if element.get('name') is None: raise ValidationError({'data': 'Invalid projector element. Name is missing.'}) projector_config[uuid.uuid4().hex] = element serializer = self.get_serializer(projector_instance, data={'config': projector_config}, partial=False) serializer.is_valid(raise_exception=True) serializer.save() return Response(serializer.data) @detail_route(methods=['post']) def prune_elements(self, request, pk): """ REST API operation to activate projector elements. It expects a POST request to /rest/core/projector//prune_elements/ with a list of dictionaries to write them to the projector config entry. All old entries are deleted but not entries with stable == True. """ if not isinstance(request.data, list): raise ValidationError({'data': 'Data must be a list.'}) projector_instance = self.get_object() projector_config = {} for key, value in projector_instance.config.items(): if value.get('stable'): projector_config[key] = value for element in request.data: if element.get('name') is None: raise ValidationError({'data': 'Invalid projector element. Name is missing.'}) projector_config[uuid.uuid4().hex] = element serializer = self.get_serializer(projector_instance, data={'config': projector_config}, partial=False) serializer.is_valid(raise_exception=True) serializer.save() return Response(serializer.data) @detail_route(methods=['post']) def update_elements(self, request, pk): """ REST API operation to update projector elements. It expects a POST request to /rest/core/projector//update_elements/ with a dictonary to update the projector config. This must be a dictionary with UUIDs as keys and projector element dictionaries as values. Example: { "191c0878cdc04abfbd64f3177a21891a": { "name": "core/countdown", "stable": true, "status": "running", "countdown_time": 1374321600.0, "visable": true, "default": 42 } } """ if not isinstance(request.data, dict): raise ValidationError({'data': 'Data must be a dictionary.'}) error = {'data': 'Data must be a dictionary with UUIDs as keys and dictionaries as values.'} for key, value in request.data.items(): try: uuid.UUID(hex=str(key)) except ValueError: raise ValidationError(error) if not isinstance(value, dict): raise ValidationError(error) projector_instance = self.get_object() projector_config = projector_instance.config for key, value in request.data.items(): if key not in projector_config: raise ValidationError({'data': 'Invalid projector element. Wrong UUID.'}) projector_config[key].update(request.data[key]) serializer = self.get_serializer(projector_instance, data={'config': projector_config}, partial=False) serializer.is_valid(raise_exception=True) serializer.save() return Response(serializer.data) @detail_route(methods=['post']) def deactivate_elements(self, request, pk): """ REST API operation to deactivate projector elements. It expects a POST request to /rest/core/projector//deactivate_elements/ with a list of hex UUIDs. These are the projector_elements in the config that should be deleted. """ if not isinstance(request.data, list): raise ValidationError({'data': 'Data must be a list of hex UUIDs.'}) for item in request.data: try: uuid.UUID(hex=str(item)) except ValueError: raise ValidationError({'data': 'Data must be a list of hex UUIDs.'}) projector_instance = self.get_object() projector_config = projector_instance.config for key in request.data: try: del projector_config[key] except KeyError: raise ValidationError({'data': 'Invalid UUID.'}) serializer = self.get_serializer(projector_instance, data={'config': projector_config}, partial=False) serializer.is_valid(raise_exception=True) serializer.save() return Response(serializer.data) @detail_route(methods=['post']) def clear_elements(self, request, pk): """ REST API operation to deactivate all projector elements but not entries with stable == True. It expects a POST request to /rest/core/projector//clear_elements/. """ projector_instance = self.get_object() projector_config = {} for key, value in projector_instance.config.items(): if value.get('stable'): projector_config[key] = value serializer = self.get_serializer(projector_instance, data={'config': projector_config}, partial=False) serializer.is_valid(raise_exception=True) serializer.save() return Response(serializer.data) @detail_route(methods=['post']) def control_view(self, request, pk): """ REST API operation to control the projector view, i. e. scale and scroll the projector. It expects a POST request to /rest/core/projector//control_view/ with a dictionary with an action ('scale' or 'scroll') and a direction ('up', 'down' or 'reset'). Example: { "action": "scale", "direction": "up" } """ if not isinstance(request.data, dict): raise ValidationError({'data': 'Data must be a dictionary.'}) if (request.data.get('action') not in ('scale', 'scroll') or request.data.get('direction') not in ('up', 'down', 'reset')): raise ValidationError({'data': "Data must be a dictionary with an action ('scale' or 'scroll') " "and a direction ('up', 'down' or 'reset')."}) projector_instance = self.get_object() if request.data['action'] == 'scale': if request.data['direction'] == 'up': projector_instance.scale = F('scale') + 1 elif request.data['direction'] == 'down': projector_instance.scale = F('scale') - 1 else: # request.data['direction'] == 'reset' projector_instance.scale = 0 else: # request.data['action'] == 'scroll' if request.data['direction'] == 'up': projector_instance.scroll = F('scroll') + 1 elif request.data['direction'] == 'down': projector_instance.scroll = F('scroll') - 1 else: # request.data['direction'] == 'reset' projector_instance.scroll = 0 projector_instance.save() message = '{action} {direction} was successful.'.format( action=request.data['action'].capitalize(), direction=request.data['direction']) return Response({'detail': message}) class CustomSlideViewSet(ModelViewSet): """ API endpoint for custom slides. There are the following views: metadata, list, retrieve, create, partial_update, update and destroy. """ queryset = CustomSlide.objects.all() serializer_class = CustomSlideSerializer def check_view_permissions(self): """ Returns True if the user has required permissions. """ return self.request.user.has_perm('core.can_manage_projector') class TagViewSet(ModelViewSet): """ API endpoint for tags. There are the following views: metadata, list, retrieve, create, partial_update, update and destroy. """ queryset = Tag.objects.all() serializer_class = TagSerializer def check_view_permissions(self): """ Returns True if the user has required permissions. """ if self.action in ('metadata', 'list', 'retrieve'): # Every authenticated user can see the metadata and list or # retrieve tags. Anonymous users can do so if they are enabled. result = self.request.user.is_authenticated() or config['general_system_enable_anonymous'] elif self.action in ('create', 'update', 'destroy'): result = self.request.user.has_perm('core.can_manage_tags') else: result = False return result class ConfigMetadata(SimpleMetadata): """ Custom metadata class to add config info to responses on OPTIONS requests. """ def determine_metadata(self, request, view): # Sort config variables by weight. config_variables = sorted(config.get_config_variables().values(), key=attrgetter('weight')) # Build tree. config_groups = [] for config_variable in config_variables: if not config_groups or config_groups[-1]['name'] != config_variable.group: config_groups.append(OrderedDict( name=config_variable.group, subgroups=[])) if not config_groups[-1]['subgroups'] or config_groups[-1]['subgroups'][-1]['name'] != config_variable.subgroup: config_groups[-1]['subgroups'].append(OrderedDict( name=config_variable.subgroup, items=[])) config_groups[-1]['subgroups'][-1]['items'].append(config_variable.data) # Add tree to metadata. metadata = super().determine_metadata(request, view) metadata['config_groups'] = config_groups return metadata class ConfigViewSet(ViewSet): """ API endpoint for the config. There are the following views: metadata, list, retrieve and update. """ metadata_class = ConfigMetadata def check_view_permissions(self): """ Returns True if the user has required permissions. """ if self.action in ('metadata', 'list', 'retrieve'): # Every authenticated user can see the metadata and list or # retrieve the config. Anonymous users can do so if they are # enabled. result = self.request.user.is_authenticated() or config['general_system_enable_anonymous'] elif self.action == 'update': result = self.request.user.has_perm('core.can_manage_config') else: result = False return result def list(self, request): """ Lists all config variables. Everybody can see them. """ return Response([{'key': key, 'value': value} for key, value in config.items()]) def retrieve(self, request, *args, **kwargs): """ Retrieves a config variable. Everybody can see it. """ key = kwargs['pk'] try: value = config[key] except ConfigNotFound: raise Http404 return Response({'key': key, 'value': value}) def update(self, request, *args, **kwargs): """ Updates a config variable. Only managers can do this. Example: {"value": 42} """ key = kwargs['pk'] value = request.data.get('value') if value is None: raise ValidationError({'detail': 'Invalid input. Config value is missing.'}) # Validate and change value. try: config[key] = value except ConfigNotFound: raise Http404 except ConfigError as e: raise ValidationError({'detail': str(e)}) # Return response. return Response({'key': key, 'value': value}) class ChatMessageViewSet(ModelViewSet): """ API endpoint for chat messages. There are the following views: metadata, list, retrieve and create. The views partial_update, update and destroy are disabled. """ queryset = ChatMessage.objects.all() serializer_class = ChatMessageSerializer def check_view_permissions(self): """ Returns True if the user has required permissions. """ # We do not want anonymous users to use the chat even the anonymous # group has the permission core.can_use_chat. return (self.action in ('metadata', 'list', 'retrieve', 'create') and self.request.user.is_authenticated() and self.request.user.has_perm('core.can_use_chat')) def perform_create(self, serializer): """ Customized method to inject the request.user into serializer's save method so that the request.user can be saved into the model field. """ serializer.save(user=self.request.user) # Special API views class UrlPatternsView(utils_views.APIView): """ Returns a dictionary with all url patterns as json. The patterns kwargs are transformed using a colon. """ URL_KWARGS_REGEX = re.compile(r'%\((\w*)\)s') http_method_names = ['get'] def get_context_data(self, **context): result = {} url_dict = get_resolver(None).reverse_dict for pattern_name in filter(lambda key: isinstance(key, str), url_dict.keys()): normalized_regex_bits, p_pattern, pattern_default_args = url_dict[pattern_name] url, url_kwargs = normalized_regex_bits[0] result[pattern_name] = self.URL_KWARGS_REGEX.sub(r':\1', url) return result class ServerTime(utils_views.APIView): """ Returns the server time as UNIX timestamp. """ http_method_names = ['get'] def get_context_data(self, **context): return now().timestamp() class VersionView(utils_views.APIView): """ Returns a dictionary with the OpenSlides version and the version of all plugins. """ http_method_names = ['get'] def get_context_data(self, **context): result = dict(openslides_version=version, plugins=[]) # Versions of plugins. for plugin in settings.INSTALLED_PLUGINS: result['plugins'].append({ 'verbose_name': get_plugin_verbose_name(plugin), 'description': get_plugin_description(plugin), 'version': get_plugin_version(plugin)}) return result class SearchView(utils_views.APIView): """ Accepts a search string and returns a list of objects where each object is a dictonary with the keywords collection and id. This view expects a get argument 'q' with a search string. See: https://pythonhosted.org/Whoosh/querylang.html for the format of the search string. """ http_method_names = ['get'] def get_context_data(self, **context): query = self.request.GET.get('q', '') return super().get_context_data( elements=search(unquote(query)), **context)