fix: add missing subspaces authz migration (#981)

## Description

This PR adds the `x/subspaces` authorization migrations that was missing from `v4.2.0`. 



---

### Author Checklist

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I have...

- [x] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
- [x] targeted the correct branch (see [PR Targeting](https://github.com/desmos-labs/desmos/blob/master/CONTRIBUTING.md#pr-targeting))
- [ ] provided a link to the relevant issue or specification
- [ ] followed the guidelines for [building modules](https://docs.cosmos.network/v0.44/building-modules/intro.html)
- [x] included the necessary unit and integration [tests](https://github.com/desmos-labs/desmos/blob/master/CONTRIBUTING.md#testing)
- [x] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [x] reviewed "Files changed" and left comments if necessary
- [x] confirmed all CI checks have passed

### Reviewers Checklist

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- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

.changeset/entries/949c3ef6e6aaea51b5bb253dc3eedc16e6f3b9dd6dfbf0cbb7406719d61285d8.yaml

@@ -0,0 +1,6 @@
+type: fix
+module: x/subspaces
+pull_request: 981
+description: Added missing subspaces authorizations migration
+backward_compatible: true
+date: 2022-07-29T08:13:00.050919588Z

app/app.go

@@ -678,7 +678,7 @@ func NewDesmosApp(
 
 		// Custom modules
 		fees.NewAppModule(app.appCodec, app.FeesKeeper),
-		subspaces.NewAppModule(appCodec, app.SubspacesKeeper, app.AccountKeeper, app.BankKeeper, app.FeesKeeper),
+		subspaces.NewAppModule(appCodec, app.SubspacesKeeper, app.AuthzKeeper, app.AccountKeeper, app.BankKeeper, app.FeesKeeper),
 		profilesModule,
 		relationships.NewAppModule(appCodec, app.RelationshipsKeeper, app.SubspacesKeeper, profilesv4.NewKeeper(keys[profilestypes.StoreKey], appCodec), app.AccountKeeper, app.BankKeeper, app.FeesKeeper),
 		posts.NewAppModule(appCodec, app.PostsKeeper, app.SubspacesKeeper, app.AccountKeeper, app.BankKeeper, app.FeesKeeper),
@@ -862,7 +862,7 @@ func NewDesmosApp(
 		// Custom modules
 		fees.NewAppModule(appCodec, app.FeesKeeper),
 		supply.NewAppModule(appCodec, legacyAmino, app.SupplyKeeper),
-		subspaces.NewAppModule(appCodec, app.SubspacesKeeper, app.AccountKeeper, app.BankKeeper, app.FeesKeeper),
+		subspaces.NewAppModule(appCodec, app.SubspacesKeeper, app.AuthzKeeper, app.AccountKeeper, app.BankKeeper, app.FeesKeeper),
 		profilesModule,
 		relationships.NewAppModule(appCodec, app.RelationshipsKeeper, app.SubspacesKeeper, profilesv4.NewKeeper(keys[profilestypes.StoreKey], appCodec), app.AccountKeeper, app.BankKeeper, app.FeesKeeper),
 		posts.NewAppModule(appCodec, app.PostsKeeper, app.SubspacesKeeper, app.AccountKeeper, app.BankKeeper, app.FeesKeeper),

proto/desmos/subspaces/v2/authz/authz.proto

@@ -0,0 +1,21 @@
+syntax = "proto3";
+package desmos.subspaces.v2.authz;
+
+import "gogoproto/gogo.proto";
+import "cosmos_proto/cosmos.proto";
+import "cosmos/base/v1beta1/coin.proto";
+
+option go_package = "github.com/desmos-labs/desmos/v4/x/subspaces/legacy/v2";
+
+// GenericSubspaceAuthorization defines an authorization to perform any
+// operation only inside a specific subspace.
+message GenericSubspaceAuthorization {
+  option (cosmos_proto.implements_interface) = "Authorization";
+
+  // Ids of the subspaces inside which to grant the permission
+  repeated uint64 subspaces_ids = 1 [ (gogoproto.customname) = "SubspacesIDs" ];
+
+  // Msg, identified by it's type URL, to grant unrestricted permissions to
+  // execute within the subspace
+  string msg = 2;
+}

x/subspaces/keeper/migrations.go

@@ -2,23 +2,26 @@ package keeper
 
 import (
 	sdk "github.com/cosmos/cosmos-sdk/types"
-
-	v3 "github.com/desmos-labs/desmos/v4/x/subspaces/legacy/v3"
+	authzkeeper "github.com/cosmos/cosmos-sdk/x/authz/keeper"
 
 	v2 "github.com/desmos-labs/desmos/v4/x/subspaces/legacy/v2"
+	v3 "github.com/desmos-labs/desmos/v4/x/subspaces/legacy/v3"
+	v4 "github.com/desmos-labs/desmos/v4/x/subspaces/legacy/v4"
 )
 
 // DONTCOVER
 
 // Migrator is a struct for handling in-place store migrations.
 type Migrator struct {
-	keeper Keeper
+	keeper      Keeper
+	authzKeeper authzkeeper.Keeper
 }
 
 // NewMigrator returns a new Migrator
-func NewMigrator(keeper Keeper) Migrator {
+func NewMigrator(keeper Keeper, authzKeeper authzkeeper.Keeper) Migrator {
 	return Migrator{
-		keeper: keeper,
+		keeper:      keeper,
+		authzKeeper: authzKeeper,
 	}
 }
 
@@ -31,3 +34,8 @@ func (m Migrator) Migrate1to2(ctx sdk.Context) error {
 func (m Migrator) Migrate2to3(ctx sdk.Context) error {
 	return v3.MigrateStore(ctx, m.keeper.storeKey, m.keeper.cdc)
 }
+
+// Migrate3to4 migrates from version 3 to 4.
+func (m Migrator) Migrate3to4(ctx sdk.Context) error {
+	return v4.MigrateStore(ctx, m.authzKeeper, m.keeper.cdc)
+}

x/subspaces/legacy/v2/authz.go

@@ -0,0 +1,65 @@
+package v2
+
+// DONTCOVER
+
+import (
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
+	"github.com/cosmos/cosmos-sdk/x/authz"
+
+	"github.com/desmos-labs/desmos/v4/x/subspaces/types"
+)
+
+// TODO: Revisit this once we have proper gas fee framework.
+// Tracking issues https://github.com/cosmos/cosmos-sdk/issues/9054, https://github.com/cosmos/cosmos-sdk/discussions/9072
+const gasCostPerIteration = uint64(10)
+
+var (
+	_ authz.Authorization = &GenericSubspaceAuthorization{}
+)
+
+// NewGenericSubspaceAuthorization creates a new GenericSubspaceAuthorization object.
+func NewGenericSubspaceAuthorization(subspacesIDs []uint64, msgTypeURL string) *GenericSubspaceAuthorization {
+	return &GenericSubspaceAuthorization{
+		SubspacesIDs: subspacesIDs,
+		Msg:          msgTypeURL,
+	}
+}
+
+// MsgTypeURL implements Authorization.MsgTypeURL.
+func (a GenericSubspaceAuthorization) MsgTypeURL() string {
+	return a.Msg
+}
+
+// Accept implements Authorization.Accept.
+func (a GenericSubspaceAuthorization) Accept(ctx sdk.Context, msg sdk.Msg) (authz.AcceptResponse, error) {
+	switch msg := msg.(type) {
+
+	case types.SubspaceMsg:
+		for _, subspaceID := range a.SubspacesIDs {
+			ctx.GasMeter().ConsumeGas(gasCostPerIteration, "generic subspace authorization")
+			if subspaceID == msg.GetSubspaceID() {
+				return authz.AcceptResponse{Accept: true}, nil
+			}
+		}
+		return authz.AcceptResponse{Accept: false}, nil
+
+	default:
+		return authz.AcceptResponse{}, sdkerrors.Wrap(sdkerrors.ErrInvalidRequest, "unknown msg type")
+	}
+}
+
+// ValidateBasic implements Authorization.ValidateBasic.
+func (a GenericSubspaceAuthorization) ValidateBasic() error {
+	if a.SubspacesIDs == nil {
+		return sdkerrors.Wrapf(sdkerrors.ErrInvalidRequest, "at least one subspace id is required")
+	}
+
+	for _, subspaceID := range a.SubspacesIDs {
+		if subspaceID == 0 {
+			return sdkerrors.Wrapf(sdkerrors.ErrInvalidRequest, "invalid subspace id")
+		}
+	}
+
+	return nil
+}