from typing import Optional from django.db import models class Domain(models.Model): """ Represents a domain that a user can have an account on. For protocol reasons, if we want to allow custom usernames per domain, each "display" domain (the one in the handle) must either let us serve on it directly, or have a "service" domain that maps to it uniquely that we can serve on that. That way, someone coming in with just an Actor URI as their entrypoint can still try to webfinger preferredUsername@actorDomain and we can return an appropriate response. It's possible to just have one domain do both jobs, of course. This model also represents _other_ servers' domains, which we treat as display domains for now, until we start doing better probing. """ domain = models.CharField(max_length=250, primary_key=True) service_domain = models.CharField( max_length=250, null=True, blank=True, db_index=True, unique=True, ) # If we own this domain local = models.BooleanField() # If we have blocked this domain from interacting with us blocked = models.BooleanField(default=False) # Domains can be joinable by any user of the instance (as the default one # should) public = models.BooleanField(default=False) # Domains can also be linked to one or more users for their private use # This should be display domains ONLY users = models.ManyToManyField("users.User", related_name="domains", blank=True) created = models.DateTimeField(auto_now_add=True) updated = models.DateTimeField(auto_now=True) @classmethod def get_remote_domain(cls, domain: str) -> "Domain": return cls.objects.get_or_create(domain=domain, local=False)[0] @classmethod def get_domain(cls, domain: str) -> Optional["Domain"]: try: return cls.objects.get( models.Q(domain=domain) | models.Q(service_domain=domain) ) except cls.DoesNotExist: return None @property def uri_domain(self) -> str: if self.service_domain: return self.service_domain return self.domain @classmethod def available_for_user(cls, user): """ Returns domains that are available for the user to put an identity on """ return cls.objects.filter( models.Q(public=True) | models.Q(users__id=user.id), local=True, ) def __str__(self): return self.domain def save(self, *args, **kwargs): # Ensure that we are not conflicting with other domains if Domain.objects.filter(service_domain=self.domain).exists(): raise ValueError( f"Domain {self.domain} is already a service domain elsewhere!" ) if self.service_domain: if Domain.objects.filter(domain=self.service_domain).exists(): raise ValueError( f"Service domain {self.service_domain} is already a domain elsewhere!" ) super().save(*args, **kwargs)