Add checked actor method

src/activity.rs

@@ -23,7 +23,8 @@
 //! # }
 //! ```
 use crate::{
-    base::{AnyBase, AsBase, Base, Extends},
+    base::{AnyBase, AsBase, Base, BaseExt, Extends},
+    error::DomainError,
     markers,
     object::{ApObject, AsObject, Object},
     primitives::OneOrMany,
@@ -445,7 +446,8 @@ pub trait ActivityExt<Kind>: AsActivity<Kind> {
 /// Documentation for the fields related to these methods can be found on the
 /// `ActorAndObject` struct
 pub trait ActorAndObjectRefExt: ActorAndObjectRef {
-    /// Fetch the actor for the current activity
+    /// Fetch the actor for the current activity, erroring if the actor's domain does not match the
+    /// ID's domain
     ///
     /// ```rust
     /// # use activitystreams_new::{context, activity::Create};
@@ -456,7 +458,34 @@ pub trait ActorAndObjectRefExt: ActorAndObjectRef {
     /// let actor_ref = create.actor();
     /// println!("{:?}", actor_ref);
     /// ```
-    fn actor(&self) -> &OneOrMany<AnyBase> {
+    fn actor<'a, Kind>(&'a self) -> Result<&OneOrMany<AnyBase>, DomainError>
+    where
+        Self: BaseExt<Kind>,
+        Kind: 'a,
+    {
+        let unchecked = self.actor_unchecked();
+
+        if unchecked.as_single_id().and_then(|id| id.domain())
+            != self.id_unchecked().and_then(|id| id.domain())
+        {
+            return Err(DomainError);
+        }
+
+        Ok(unchecked)
+    }
+
+    /// Fetch the actor for the current activity
+    ///
+    /// ```rust
+    /// # use activitystreams_new::{context, activity::Create};
+    /// # let mut create = Create::new(context(), context());
+    /// #
+    /// use activitystreams_new::prelude::*;
+    ///
+    /// let actor_ref = create.actor_unchecked();
+    /// println!("{:?}", actor_ref);
+    /// ```
+    fn actor_unchecked(&self) -> &OneOrMany<AnyBase> {
         self.actor_field_ref()
     }
 
@@ -475,7 +504,7 @@ pub trait ActorAndObjectRefExt: ActorAndObjectRef {
     /// # }
     /// ```
     fn actor_is(&self, id: &Url) -> bool {
-        self.actor().is_single_id(id)
+        self.actor_unchecked().is_single_id(id)
     }
 
     /// Set the actor for the current activity