Borrow an Identity's ControllerCap in order to perform operations on sub-Identities

identity_iota_core/packages/iota_identity/sources/controller.move

@@ -5,6 +5,7 @@ module iota_identity::controller {
 
   public use fun delete_controller_cap as ControllerCap.delete;
   public use fun delete_delegation_token as DelegationToken.delete;
+  public use fun delegation_token_id as DelegationToken.id;
 
   /// This `ControllerCap` cannot delegate access.
   const ECannotDelegate: u64 = 0;
@@ -61,6 +62,11 @@ module iota_identity::controller {
     controller: ID,
   }
 
+  /// Returns the ID of this `DelegationToken`.
+  public fun delegation_token_id(self: &DelegationToken): ID {
+    self.id.to_inner()
+  }
+
   /// Returns the controller's ID of this `DelegationToken`.
   public fun controller(self: &DelegationToken): ID {
     self.controller

identity_iota_core/packages/iota_identity/sources/identity.move

@@ -15,6 +15,7 @@ module iota_identity::identity {
         transfer_proposal::{Self, Send},
         borrow_proposal::{Self, Borrow},
         did_deactivation_proposal::{Self, DidDeactivation},
+        controller_proposal::{Self, ControllerExecution},
         upgrade_proposal::{Self, Upgrade},
     };
 
@@ -190,7 +191,7 @@ module iota_identity::identity {
             self.execute_deactivation(cap, proposal_id, clock, ctx);
             option::none()
         } else {
-            emit_proposal_event(self.id().to_inner(), cap.id().to_inner(), proposal_id, false);
+            emit_proposal_event(self.id().to_inner(), cap.id(), proposal_id, false);
             option::some(proposal_id)
         }
     }
@@ -211,13 +212,43 @@ module iota_identity::identity {
         self.did_doc.set_controlled_value(vector[]);
         self.updated = clock.timestamp_ms();
 
-        emit_proposal_event(self.id().to_inner(), cap.id().to_inner(), proposal_id, true);
+        emit_proposal_event(self.id().to_inner(), cap.id(), proposal_id, true);
+    }
+
+    /// Creates a new `ControllerExecution` proposal.
+    public fun propose_controller_execution(
+        self: &mut Identity,
+        cap: &DelegationToken,
+        controller_cap_id: ID,
+        expiration: Option<u64>,
+        ctx: &mut TxContext,
+    ): ID {
+        let identity_address = self.id().to_address();
+        let proposal_id = self.did_doc.create_proposal(
+            cap,
+            controller_proposal::new(controller_cap_id, identity_address),
+            expiration,
+            ctx,
+        );
+
+        emit_proposal_event(self.id().to_inner(), cap.id(), proposal_id, false);
+        proposal_id
+    }
+
+    /// Borrow the identity-owned controller cap specified in `ControllerExecution`.
+    /// The borrowed cap must be put back by calling `controller_proposal::put_back`.
+    public fun borrow_controller_cap(
+        self: &mut Identity,
+        action: &mut Action<ControllerExecution>,
+        receiving: Receiving<ControllerCap>,
+    ): ControllerCap {
+        controller_proposal::receive(action, &mut self.id, receiving)
     }
 
     /// Proposes to upgrade this `Identity` to this package's version.
     public fun propose_upgrade(
         self: &mut Identity,
-        cap: &ControllerCap,
+        cap: &DelegationToken,
         expiration: Option<u64>,
         ctx: &mut TxContext,
     ): Option<ID> {
@@ -235,7 +266,7 @@ module iota_identity::identity {
             self.execute_upgrade(cap, proposal_id, ctx); 
             option::none()
         } else {
-            emit_proposal_event(self.id().to_inner(), cap.id().to_inner(), proposal_id, false);
+            emit_proposal_event(self.id().to_inner(), cap.id(), proposal_id, false);
             option::some(proposal_id)
         }
     }
@@ -244,13 +275,13 @@ module iota_identity::identity {
     /// package's version.
     public fun execute_upgrade(
         self: &mut Identity,
-        cap: &ControllerCap,
+        cap: &DelegationToken,
         proposal_id: ID,
         ctx: &mut TxContext,
     ) {
         self.execute_proposal<Upgrade>(cap, proposal_id, ctx).unwrap();
         self.migrate();
-        emit_proposal_event(self.id().to_inner(), cap.id().to_inner(), proposal_id, true);
+        emit_proposal_event(self.id().to_inner(), cap.id(), proposal_id, true);
     }
 
     /// Migrates this `Identity` to this package's version.
@@ -286,7 +317,7 @@ module iota_identity::identity {
             self.execute_update(cap, proposal_id, clock, ctx);
             option::none()
         } else {
-            emit_proposal_event(self.id().to_inner(), cap.id().to_inner(), proposal_id, false);
+            emit_proposal_event(self.id().to_inner(), cap.id(), proposal_id, false);
             option::some(proposal_id)
         }
     }
@@ -307,7 +338,7 @@ module iota_identity::identity {
         );
 
         self.updated = clock.timestamp_ms();
-        emit_proposal_event(self.id().to_inner(), cap.id().to_inner(), proposal_id, true);
+        emit_proposal_event(self.id().to_inner(), cap.id(), proposal_id, true);
     }
 
     /// Proposes to update this `Identity`'s AC.
@@ -341,7 +372,7 @@ module iota_identity::identity {
             self.execute_config_change(cap, proposal_id, ctx);
             option::none()
         } else {
-            emit_proposal_event(self.id().to_inner(), cap.id().to_inner(), proposal_id, false);
+            emit_proposal_event(self.id().to_inner(), cap.id(), proposal_id, false);
             option::some(proposal_id)
         }
     }
@@ -359,7 +390,7 @@ module iota_identity::identity {
             proposal_id,
             ctx,
         );
-        emit_proposal_event(self.id().to_inner(), cap.id().to_inner(), proposal_id, true);
+        emit_proposal_event(self.id().to_inner(), cap.id(), proposal_id, true);
     }
 
     /// Proposes the transfer of a set of objects owned by this `Identity`.
@@ -370,7 +401,7 @@ module iota_identity::identity {
         objects: vector<ID>,
         recipients: vector<address>,
         ctx: &mut TxContext,
-    ) {
+    ): ID {
         let proposal_id = transfer_proposal::propose_send(
             &mut self.did_doc,
             cap,
@@ -379,7 +410,8 @@ module iota_identity::identity {
             recipients,
             ctx
         );
-        emit_proposal_event(self.id().to_inner(), cap.id().to_inner(), proposal_id, false);
+        emit_proposal_event(self.id().to_inner(), cap.id(), proposal_id, false);
+        proposal_id
     }
 
     /// Sends one object among the one specified in a `Send` proposal.
@@ -399,7 +431,7 @@ module iota_identity::identity {
         expiration: Option<u64>,
         objects: vector<ID>,
         ctx: &mut TxContext,
-    ) {
+    ): ID {
         let identity_address = self.id().to_address();
         let proposal_id = borrow_proposal::propose_borrow(
             &mut self.did_doc,
@@ -409,7 +441,8 @@ module iota_identity::identity {
             identity_address,
             ctx,
         );
-        emit_proposal_event(self.id().to_inner(), cap.id().to_inner(), proposal_id, false);
+        emit_proposal_event(self.id().to_inner(), cap.id(), proposal_id, false);
+        proposal_id
     }
 
     /// Takes one of the borrowed assets.
@@ -444,7 +477,7 @@ module iota_identity::identity {
         proposal_id: ID,
         ctx: &mut TxContext,
     ): Action<T> {
-        emit_proposal_event(self.id().to_inner(), cap.id().to_inner(), proposal_id, true);
+        emit_proposal_event(self.id().to_inner(), cap.id(), proposal_id, true);
         self.did_doc.execute_proposal(cap, proposal_id, ctx)
     }
 

identity_iota_core/packages/iota_identity/sources/multicontroller.move

@@ -293,7 +293,7 @@ module iota_identity::multicontroller {
     /// Destroys a `ControllerCap`. Can only be used after a controller has been removed from
     /// the controller committee.
     public fun destroy_controller_cap<V>(self: &Multicontroller<V>, cap: ControllerCap) {
-        assert!(self.controllers.contains(&cap.id().to_inner()), EInvalidController);
+        assert!(!self.controllers.contains(&cap.id().to_inner()), EInvalidController);
 
         cap.delete();
     }

identity_iota_core/packages/iota_identity/sources/proposals/borrow.move

@@ -28,7 +28,7 @@ module iota_identity::borrow_proposal {
   ): ID {
     let action = Borrow { objects, objects_to_return: vector::empty(), owner };
 
-    multi.create_proposal(cap, action,expiration, ctx)
+    multi.create_proposal(cap, action, expiration, ctx)
   }
 
   /// Borrows an asset from this action. This function will fail if:

identity_iota_core/packages/iota_identity/sources/proposals/controller.move

@@ -0,0 +1,56 @@
+module iota_identity::controller_proposal {
+  use iota::transfer::Receiving;
+  use iota_identity::controller::{Self, ControllerCap};
+  use iota_identity::multicontroller::Action;
+
+  /// The received `ControllerCap` does not match the one
+  /// specified in the `ControllerExecution` action.
+  const EControllerCapMismatch: u64 = 0;
+  /// The provided `UID` is not the `UID` of the `Identity`
+  /// specified in the action.
+  const EInvalidIdentityUID: u64 = 1;
+
+  /// Borrow a given `ControllerCap` from an `Identity` for 
+  /// a single transaction.
+  public struct ControllerExecution has store {
+    /// ID of the `ControllerCap` to borrow.
+    controller_cap: ID,
+    /// The address of the `Identity` that owns
+    /// the `ControllerCap` we are borrowing.
+    identity: address,
+  }
+
+  /// Returns a new `ControllerExecution` that - in a Proposal - allows whoever
+  /// executes it to receive `identity`'s `ControllerCap` (the one that has ID `controller_cap`)
+  /// for the duration of a single transaction.
+  public fun new(controller_cap: ID, identity: address): ControllerExecution {
+    ControllerExecution {
+      controller_cap,
+      identity,
+    }
+  }
+
+  /// Returns the `ControllerCap` specified in this action.
+  public fun receive(
+    self: &mut Action<ControllerExecution>,
+    identity: &mut UID,
+    cap: Receiving<ControllerCap>
+  ): ControllerCap {
+    assert!(identity.to_address() == self.borrow().identity, EInvalidIdentityUID);
+    assert!(cap.receiving_object_id() == self.borrow().controller_cap, EControllerCapMismatch);
+
+    controller::receive(identity, cap)     
+  }
+
+  /// Consumes a `ControllerExecution` action by returning the borrowed `ControllerCap`
+  /// to the corresponding `Identity`.
+  public fun put_back(
+    action: Action<ControllerExecution>,
+    cap: ControllerCap,
+  ) {
+    let ControllerExecution { identity, controller_cap } = action.unwrap();
+    assert!(object::id(&cap) == controller_cap, EControllerCapMismatch);
+
+    cap.transfer(identity);
+  }
+}

identity_iota_core/src/rebased/client/read_only.rs

@@ -118,8 +118,8 @@ impl IdentityClientReadOnly {
       .map_err(|e| Error::ObjectLookup(e.to_string()))
   }
 
-  #[allow(dead_code)]
-  pub(crate) async fn get_object_ref_by_id(&self, obj: ObjectID) -> Result<Option<OwnedObjectRef>, Error> {
+  /// Returns an object's [`OwnedObjectRef`], if any.
+  pub async fn get_object_ref_by_id(&self, obj: ObjectID) -> Result<Option<OwnedObjectRef>, Error> {
     self
       .read_api()
       .get_object_with_options(obj, IotaObjectDataOptions::default().with_owner())

identity_iota_core/src/rebased/migration/identity.rs

@@ -41,6 +41,7 @@ use crate::rebased::client::IdentityClientReadOnly;
 use crate::rebased::client::IotaKeySignature;
 use crate::rebased::proposals::BorrowAction;
 use crate::rebased::proposals::ConfigChange;
+use crate::rebased::proposals::ControllerExecution;
 use crate::rebased::proposals::DeactivateDid;
 use crate::rebased::proposals::ProposalBuilder;
 use crate::rebased::proposals::SendAction;
@@ -182,13 +183,18 @@ impl OnChainIdentity {
   }
 
   /// Borrows assets owned by this [`OnChainIdentity`] to use them in a custom transaction.
-  /// # Notes
-  /// Make sure to call [`super::Proposal::with_intent`] before executing the proposal.
-  /// Failing to do so will make [`crate::proposals::ProposalT::execute`] return an error.
   pub fn borrow_assets(&mut self) -> ProposalBuilder<'_, BorrowAction> {
     ProposalBuilder::new(self, BorrowAction::default())
   }
 
+  /// Borrows a `ControllerCap` with ID `controller_cap` owned by this identity in a transaction.
+  /// This proposal is used to perform operation on a sub-identity controlled
+  /// by this one.
+  pub fn controller_execution(&mut self, controller_cap: ObjectID) -> ProposalBuilder<'_, ControllerExecution> {
+    let action = ControllerExecution::new(controller_cap, self);
+    ProposalBuilder::new(self, action)
+  }
+
   /// Returns historical data for this [`OnChainIdentity`].
   pub async fn get_history(
     &self,
@@ -409,7 +415,7 @@ pub(crate) fn unpack_identity_data(
     did_doc: multi_controller,
     created,
     updated,
-    version
+    version,
   } = serde_json::from_value::<TempOnChainIdentity>(value.fields.to_json_value())
     .map_err(|err| Error::ObjectLookup(format!("could not parse identity document with DID {did}; {err}")))?;