import base64 import json import os import re import uuid from collections import OrderedDict from operator import attrgetter from textwrap import dedent 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 django.utils.translation import ugettext as _ from .. import __version__ as version from ..utils import views as utils_views from ..utils.autoupdate import inform_changed_data, inform_deleted_data from ..utils.collection import Collection, CollectionElement from ..utils.plugins import ( get_plugin_description, get_plugin_verbose_name, get_plugin_version, ) from ..utils.rest_api import ( ModelViewSet, Response, SimpleMetadata, ValidationError, ViewSet, detail_route, list_route, ) from ..utils.search import search from .access_permissions import ( ChatMessageAccessPermissions, ConfigAccessPermissions, ProjectorAccessPermissions, TagAccessPermissions, ) from .config import config from .exceptions import ConfigError, ConfigNotFound from .models import ChatMessage, ConfigStore, ProjectionDefault, Projector, Tag # 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 projector container template is 'openslides/core/static/templates/projector-container.html'. This container is for controlling the projector resolution. """ def get(self, *args, **kwargs): with open(finders.find('templates/projector-container.html')) as f: content = f.read() return HttpResponse(content) class RealProjectorView(utils_views.View): """ The original view without resolutioncontrol 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 WebclientJavaScriptView(utils_views.View): """ This view returns JavaScript code for the main entry point in the AngularJS app for the requested realm (site or projector). Also code for plugins is appended. The result is not uglified. """ def get(self, *args, **kwargs): angular_modules = [] js_files = [] realm = kwargs.get('realm') # Result is 'site' or 'projector' for app_config in apps.get_app_configs(): # Add the angular app if the module has one. if getattr(app_config, 'angular_{}_module'.format(realm), False): angular_modules.append('OpenSlidesApp.{app_name}.{realm}'.format( app_name=app_config.label, realm=realm)) # Add all JavaScript files that the module needs. Our core apps # are delivered by an extra file js/openslides.js which can be # created via gulp. core_apps = ( 'openslides.core', 'openslides.agenda', 'openslides.motions', 'openslides.assignments', 'openslides.users', 'openslides.mediafiles', ) if app_config.name not in core_apps: try: app_js_files = app_config.js_files except AttributeError: # The app needs no JavaScript files. pass else: js_files.extend(app_js_files) # Use JavaScript loadScript function from # http://balpha.de/2011/10/jquery-script-insertion-and-its-consequences-for-debugging/ # jQuery is required. content = dedent( """ (function () { 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.{realm}', {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.{realm}']); }} ); """.format(realm=realm, angular_modules=angular_modules, js_files=js_files) + """ }()); """) return HttpResponse(content, content_type='application/javascript') # Viewsets for the REST API class ProjectorViewSet(ModelViewSet): """ 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. """ access_permissions = ProjectorAccessPermissions() queryset = Projector.objects.all() def check_view_permissions(self): """ Returns True if the user has required permissions. """ if self.action in ('list', 'retrieve'): result = self.get_access_permissions().check_permissions(self.request.user) elif self.action == 'metadata': result = self.request.user.has_perm('core.can_see_projector') elif self.action in ( 'create', 'update', 'partial_update', 'destroy', 'activate_elements', 'prune_elements', 'update_elements', 'deactivate_elements', 'clear_elements', 'control_view', 'set_resolution', 'set_scroll', 'control_blank', 'broadcast', 'set_projectiondefault', ): 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 # Assign all ProjectionDefault objects from this projector to the default projector (pk=1). def destroy(self, *args, **kwargs): projector_instance = self.get_object() for projection_default in ProjectionDefault.objects.all(): if projection_default.projector.id == projector_instance.id: projection_default.projector_id = 1 projection_default.save() return super(ProjectorViewSet, self).destroy(*args, **kwargs) @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({'detail': '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({'detail': '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({'detail': '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({'detail': '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({'detail': 'Data must be a dictionary.'}) error = {'detail': '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({'detail': '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({'detail': 'Data must be a list of hex UUIDs.'}) for item in request.data: try: uuid.UUID(hex=str(item)) except ValueError: raise ValidationError({'detail': '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({'detail': '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 set_resolution(self, request, pk): """ REST API operation to set the resolution. It is actually unused, because the resolution is currently set in the config. But with the multiprojector feature this will become importent to set the resolution per projector individually. It expects a POST request to /rest/core/projector//set_resolution/ with a dictionary with the width and height and the values. Example: { "width": "1024", "height": "768" } """ if not isinstance(request.data, dict): raise ValidationError({'detail': 'Data must be a dictionary.'}) if request.data.get('width') is None or request.data.get('height') is None: raise ValidationError({'detail': 'A width and a height have to be given.'}) if not isinstance(request.data['width'], int) or not isinstance(request.data['height'], int): raise ValidationError({'detail': 'Data has to be integers.'}) if (request.data['width'] < 800 or request.data['width'] > 3840 or request.data['height'] < 600 or request.data['height'] > 2160): raise ValidationError({'detail': 'The Resolution have to be between 800x600 and 3840x2160.'}) projector_instance = self.get_object() projector_instance.width = request.data['width'] projector_instance.height = request.data['height'] projector_instance.save() message = 'Changing resolution to {width}x{height} was successful.'.format( width=request.data['width'], height=request.data['height']) return Response({'detail': message}) @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({'detail': '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({'detail': "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(skip_autoupdate=True) projector_instance.refresh_from_db() inform_changed_data(projector_instance) message = '{action} {direction} was successful.'.format( action=request.data['action'].capitalize(), direction=request.data['direction']) return Response({'detail': message}) @detail_route(methods=['post']) def set_scroll(self, request, pk): """ REST API operation to scroll the projector. It expects a POST request to /rest/core/projector//set_scroll/ with a new value for scroll. """ if not isinstance(request.data, int): raise ValidationError({'detail': 'Data must be an int.'}) projector_instance = self.get_object() projector_instance.scroll = request.data projector_instance.save() message = 'Setting scroll to {scroll} was successful.'.format( scroll=request.data) return Response({'detail': message}) @detail_route(methods=['post']) def control_blank(self, request, pk): """ REST API operation to blank the projector. It expects a POST request to /rest/core/projector//control_blank/ with a value for blank. """ if not isinstance(request.data, bool): raise ValidationError({'detail': 'Data must be a bool.'}) projector_instance = self.get_object() projector_instance.blank = request.data projector_instance.save() message = "Setting 'blank' to {blank} was successful.".format( blank=request.data) return Response({'detail': message}) @detail_route(methods=['post']) def broadcast(self, request, pk): """ REST API operation to (un-)broadcast the given projector. This method takes care, that all other projectors get the new requirements. It expects a POST request to /rest/core/projector//broadcast/ without an argument """ if config['projector_broadcast'] == 0: config['projector_broadcast'] = pk message = "Setting projector {id} as broadcast projector was successful.".format( id=pk) else: config['projector_broadcast'] = 0 message = "Disabling broadcast was successful." return Response({'detail': message}) @detail_route(methods=['post']) def set_projectiondefault(self, request, pk): """ REST API operation to set a projectiondefault to the requested projector. The argument has to be an int representing the pk from the projectiondefault to be set. It expects a POST request to /rest/core/projector//set_projectiondefault/ with the projectiondefault id as the argument """ if not isinstance(request.data, int): raise ValidationError({'detail': 'Data must be an int.'}) try: projectiondefault = ProjectionDefault.objects.get(pk=request.data) except ProjectionDefault.DoesNotExist: raise ValidationError({'detail': 'The projectiondefault with pk={pk} was not found.'.format( pk=request.data)}) else: projector_instance = self.get_object() projectiondefault.projector = projector_instance projectiondefault.save() return Response('Setting projectiondefault "{name}" to projector {projector_id} was successful.'.format( name=projectiondefault.display_name, projector_id=projector_instance.pk)) class TagViewSet(ModelViewSet): """ API endpoint for tags. There are the following views: metadata, list, retrieve, create, partial_update, update and destroy. """ access_permissions = TagAccessPermissions() queryset = Tag.objects.all() def check_view_permissions(self): """ Returns True if the user has required permissions. """ if self.action in ('list', 'retrieve'): result = self.get_access_permissions().check_permissions(self.request.user) elif self.action == 'metadata': # Every authenticated user can see the metadata and list 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): # Build tree. config_groups = [] for config_variable in sorted(config.config_variables.values(), key=attrgetter('weight')): if config_variable.is_hidden(): # Skip hidden config variables. Do not even check groups and subgroups. continue if not config_groups or config_groups[-1]['name'] != config_variable.group: # Add new 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: # Add new subgroup. config_groups[-1]['subgroups'].append(OrderedDict( name=config_variable.subgroup, items=[])) # Add the config variable to the current group and subgroup. 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. """ access_permissions = ConfigAccessPermissions() metadata_class = ConfigMetadata def check_view_permissions(self): """ Returns True if the user has required permissions. """ if self.action in ('list', 'retrieve'): result = self.get_access_permissions().check_permissions(self.request.user) elif self.action == 'metadata': # 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. """ collection = Collection(config.get_collection_string()) return Response(collection.as_list_for_user(request.user)) def retrieve(self, request, *args, **kwargs): """ Retrieves a config variable. """ key = kwargs['pk'] collection_element = CollectionElement.from_values(config.get_collection_string(), key) try: content = collection_element.as_dict_for_user(request.user) except ConfigStore.DoesNotExist: raise Http404 if content is None: # If content is None, the user has no permissions to see the item. # See ConfigAccessPermissions or rather its parent class. self.permission_denied() return Response(content) 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. """ access_permissions = ChatMessageAccessPermissions() queryset = ChatMessage.objects.all() def check_view_permissions(self): """ Returns True if the user has required permissions. """ if self.action in ('list', 'retrieve'): result = self.get_access_permissions().check_permissions(self.request.user) elif self.action in ('metadata', 'create'): # We do not want anonymous users to use the chat even the anonymous # group has the permission core.can_use_chat. result = ( self.request.user.is_authenticated() and self.request.user.has_perm('core.can_use_chat')) elif self.action == 'clear': result = ( self.request.user.has_perm('core.can_use_chat') and self.request.user.has_perm('core.can_manage_chat')) else: result = False return result 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) @list_route(methods=['post']) def clear(self, request): """ Deletes all chat messages. """ # Collect all chat messages with their collection_string and id chatmessages = ChatMessage.objects.all() args = [] for chatmessage in chatmessages: args.append(chatmessage.get_collection_string()) args.append(chatmessage.pk) chatmessages.delete() # Trigger autoupdate and setup response. inform_deleted_data(*args) return Response({'detail': _('All chat messages deleted successfully.')}) # 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) class MediaEncoder(utils_views.APIView): """ MediaEncoder is a class based view to prepare encoded media for pdfMake """ http_method_names = ['post'] def post(self, request, *args, **kwargs): """ Encode_image is used in the context of PDF-Generation Takes an array of IMG.src - Paths Retrieves the according images Encodes the images to BASE64 Add configured fonts Puts it into a key-value structure { "images": { "media/file/ubuntu.png":"$ENCODED_IMAGE" }, "fonts": [{ $FontName : { normal: $Filename bold: $Filename italics: $Filename bolditalics: $Filename } }], "default_font": "$DEFAULTFONT" } :param request: :return: Response of the resulting dictionary Calling e.g. $.ajax({ type: "POST", url: "/motions/encode_images/", data: JSON.stringify(["$FILEPATH"]), success: function(data){ console.log(data); }, dataType: 'application/json' }); """ body_unicode = request.body.decode('utf-8') file_paths = json.loads(body_unicode) images = {file_path: self.encode_image_from(file_path) for file_path in file_paths} fonts = self.encoded_fonts() default_font = self.get_default_font() return Response({ "images": images, "fonts": fonts, "defaultFont": default_font }) def get_default_font(self): """ Returns the default font for pdfMake. Note: For development purposes this is hard coded. :return: the name of the default Font """ return 'OpenSans' def encoded_fonts(self): """ Generate font encoding for pdfMake :return: list of Font Encodings """ fonts = self.get_configured_fonts() enc_fonts = [self.encode_font(name, files) for name, files in fonts.items()] return enc_fonts def get_configured_fonts(self): """ Returns the configured fonts Note: For development purposes, the current font definition is hard coded The form is { $FontName : { normal: $Filename bold: $Filename italics: $Filename bolditalics: $Filename } } This structure is required according to PDFMake specs. :return: """ fonts = { 'OpenSans': { 'normal': 'OpenSans-Regular.ttf', 'bold': 'OpenSans-Bold.ttf', 'italics': 'OpenSans-Italic.ttf', 'bolditalics': 'OpenSans-BoldItalic.ttf' } } return fonts def encode_font(self, font_name, font_files): """ Responsible to encode a single font :param fontName: name of the font :param font_files: files for different weighs :return: dictionary with encoded font """ encoded_files = {type: self.encode_font_from(file_path) for type, file_path in font_files.items()} return {font_name: encoded_files} def encode_font_from(self, file_path): """ Returns the BASE64 encoded version of an image-file for a given path :param file_path: :return: dictionary with the string representation (content) and the name of the file for the pdfMake.vfs structure """ path = os.path.join(settings.MODULE_DIR, 'static', 'fonts', os.path.basename(file_path)) try: with open(path, "rb") as file: string_representation = "{}".format(base64.b64encode(file.read()).decode()) except: return "" else: return {"content": string_representation, "name": file_path} def encode_image_from(self, file_path): """ Returns the BASE64 encoded version of an image-file for a given path :param file_path: :return: """ path = os.path.join(settings.MEDIA_ROOT, 'file', os.path.basename(file_path)) try: with open(path, "rb") as file: string_representation = "data:image/{};base64,{}".format(os.path.splitext(file_path)[1][1:], base64.b64encode(file.read()).decode()) except Exception: # If any error occurs ignore it and return an empty string return "" else: return string_representation