import string from django import forms from django.contrib.auth.decorators import login_required from django.contrib.syndication.views import Feed from django.core import validators from django.http import Http404, JsonResponse from django.shortcuts import redirect from django.utils.decorators import method_decorator from django.views.generic import FormView, ListView, TemplateView, View from activities.models import Post, PostInteraction from core.decorators import per_identity_cache_page from core.ld import canonicalise from core.models import Config from users.decorators import identity_required from users.models import Domain, Follow, FollowStates, Identity, IdentityStates from users.shortcuts import by_handle_or_404 @method_decorator(per_identity_cache_page(), name="dispatch") class ViewIdentity(ListView): """ Shows identity profile pages, and also acts as the Actor endpoint when approached with the right Accept header. """ template_name = "identity/view.html" paginate_by = 5 def get(self, request, handle): # Make sure we understand this handle self.identity = by_handle_or_404( self.request, handle, local=False, fetch=True, ) if ( not self.identity.local and self.identity.data_age > Config.system.identity_max_age ): self.identity.transition_perform(IdentityStates.outdated) # If they're coming in looking for JSON, they want the actor accept = request.META.get("HTTP_ACCEPT", "text/html").lower() if ( "application/json" in accept or "application/ld" in accept or "application/activity" in accept ): # Return actor info return self.serve_actor(self.identity) else: # Show normal page return super().get(request, identity=self.identity) def serve_actor(self, identity): # If this not a local actor, redirect to their canonical URI if not identity.local: return redirect(identity.actor_uri) return JsonResponse( canonicalise(identity.to_ap(), include_security=True), content_type="application/activity+json", ) def get_queryset(self): return ( self.identity.posts.filter( visibility__in=[Post.Visibilities.public, Post.Visibilities.unlisted], ) .select_related("author") .prefetch_related("attachments") .order_by("-created") ) def get_context_data(self): context = super().get_context_data() context["identity"] = self.identity context["follow"] = None context["reverse_follow"] = None context["interactions"] = PostInteraction.get_post_interactions( context["page_obj"], self.request.identity, ) if self.request.identity: follow = Follow.maybe_get(self.request.identity, self.identity) if follow and follow.state in FollowStates.group_active(): context["follow"] = follow reverse_follow = Follow.maybe_get(self.identity, self.request.identity) if reverse_follow and reverse_follow.state in FollowStates.group_active(): context["reverse_follow"] = reverse_follow return context @method_decorator( per_identity_cache_page("cache_timeout_identity_feed"), name="__call__" ) class IdentityFeed(Feed): """ Serves a local user's Public posts as an RSS feed """ def get_object(self, request, handle): return by_handle_or_404( request, handle, local=True, ) def title(self, identity: Identity): return identity.name def description(self, identity: Identity): return f"Public posts from @{identity.handle}" def link(self, identity: Identity): return identity.absolute_profile_uri() def items(self, identity: Identity): return ( identity.posts.filter( visibility=Post.Visibilities.public, ) .select_related("author") .prefetch_related("attachments") .order_by("-created") ) def item_description(self, item: Post): return item.safe_content_remote() def item_link(self, item: Post): return item.absolute_object_uri() def item_pubdate(self, item: Post): return item.published @method_decorator(identity_required, name="dispatch") class ActionIdentity(View): def post(self, request, handle): identity = by_handle_or_404(self.request, handle, local=False) # See what action we should perform action = self.request.POST["action"] if action == "follow": existing_follow = Follow.maybe_get(self.request.identity, identity) if not existing_follow: Follow.create_local(self.request.identity, identity) elif existing_follow.state in [ FollowStates.undone, FollowStates.undone_remotely, ]: existing_follow.transition_perform(FollowStates.unrequested) elif action == "unfollow": existing_follow = Follow.maybe_get(self.request.identity, identity) if existing_follow: existing_follow.transition_perform(FollowStates.undone) else: raise ValueError(f"Cannot handle identity action {action}") return redirect(identity.urls.view) @method_decorator(login_required, name="dispatch") class SelectIdentity(TemplateView): template_name = "identity/select.html" def get_context_data(self): return { "identities": Identity.objects.filter(users__pk=self.request.user.pk), } @method_decorator(login_required, name="dispatch") class ActivateIdentity(View): def get(self, request, handle): identity = by_handle_or_404(request, handle) if not identity.users.filter(pk=request.user.pk).exists(): raise Http404() request.session["identity_id"] = identity.id # Get next URL, not allowing offsite links next = request.GET.get("next") or "/" if ":" in next: next = "/" return redirect("/") @method_decorator(login_required, name="dispatch") class CreateIdentity(FormView): template_name = "identity/create.html" class form_class(forms.Form): username = forms.CharField( help_text="Must be unique on your domain. Cannot be changed easily. Use only: a-z 0-9 _ -" ) domain = forms.ChoiceField( help_text="Pick the domain to make this identity on. Cannot be changed later." ) name = forms.CharField( help_text="The display name other users see. You can change this easily." ) discoverable = forms.BooleanField( help_text="If this user is visible on the frontpage and in user directories.", initial=True, widget=forms.Select( choices=[(True, "Discoverable"), (False, "Not Discoverable")] ), required=False, ) def __init__(self, user, *args, **kwargs): super().__init__(*args, **kwargs) self.fields["domain"].choices = [ (domain.domain, domain.domain) for domain in Domain.available_for_user(user) ] self.user = user def clean_username(self): # Remove any leading @ and force it lowercase value = self.cleaned_data["username"].lstrip("@").lower() if not self.user.admin: # Apply username min length limit = int(Config.system.identity_min_length) validators.MinLengthValidator(limit)(value) # Apply username restrictions if value in Config.system.restricted_usernames.split(): raise forms.ValidationError( "This username is restricted to administrators only." ) if value in ["__system__"]: raise forms.ValidationError( "This username is reserved for system use." ) # Validate it's all ascii characters for character in value: if character not in string.ascii_letters + string.digits + "_-": raise forms.ValidationError( "Only the letters a-z, numbers 0-9, dashes, and underscores are allowed." ) return value def clean(self): # Check for existing users username = self.cleaned_data.get("username") domain = self.cleaned_data.get("domain") if ( username and domain and Identity.objects.filter(username=username, domain=domain).exists() ): raise forms.ValidationError(f"{username}@{domain} is already taken") if not self.user.admin and ( Identity.objects.filter(users=self.user).count() >= Config.system.identity_max_per_user ): raise forms.ValidationError( f"You are not allowed more than {Config.system.identity_max_per_user} identities" ) def get_form(self): form_class = self.get_form_class() return form_class(user=self.request.user, **self.get_form_kwargs()) def form_valid(self, form): username = form.cleaned_data["username"] domain = form.cleaned_data["domain"] domain_instance = Domain.get_domain(domain) new_identity = Identity.objects.create( actor_uri=f"https://{domain_instance.uri_domain}/@{username}@{domain}/", username=username.lower(), domain_id=domain, name=form.cleaned_data["name"], local=True, discoverable=form.cleaned_data["discoverable"], ) new_identity.users.add(self.request.user) new_identity.generate_keypair() self.request.session["identity_id"] = new_identity.id return redirect(new_identity.urls.view)