Add permissions to JWT

For certain method calls, we need to add additional permissions to the JWT:
e.g. when adding a model, we need to add cloud permission stating that the
user has permission to add-model on that cloud.

internal/jimm/applicationoffer.go

@@ -21,6 +21,7 @@ import (
 	"github.com/canonical/jimm/internal/errors"
 	"github.com/canonical/jimm/internal/openfga"
 	ofganames "github.com/canonical/jimm/internal/openfga/names"
+	jimmnames "github.com/canonical/jimm/pkg/names"
 )
 
 // AddApplicationOfferParams holds parameters for the Offer method.
@@ -202,7 +203,15 @@ func (j *JIMM) GetApplicationOfferConsumeDetails(ctx context.Context, user *open
 		return errors.E(op, errors.CodeNotFound)
 	}
 
-	api, err := j.dial(ctx, &offer.Model.Controller, names.ModelTag{})
+	api, err := j.dial(
+		ctx,
+		&offer.Model.Controller,
+		names.ModelTag{},
+		permission{
+			resource: jimmnames.NewApplicationOfferTag(offer.UUID).String(),
+			relation: accessLevel,
+		},
+	)
 	if err != nil {
 		return errors.E(op, err)
 	}
@@ -312,7 +321,15 @@ func (j *JIMM) GetApplicationOffer(ctx context.Context, user *openfga.User, offe
 	// controller. The all-watcher events do not include enough
 	// information to reasonably keep the local database up-to-date,
 	// and it would be non-trivial to make it do so.
-	api, err := j.dial(ctx, &offer.Model.Controller, names.ModelTag{})
+	api, err := j.dial(
+		ctx,
+		&offer.Model.Controller,
+		names.ModelTag{},
+		permission{
+			resource: jimmnames.NewApplicationOfferTag(offer.UUID).String(),
+			relation: accessLevel,
+		},
+	)
 	if err != nil {
 		return nil, errors.E(op, err)
 	}
@@ -498,7 +515,15 @@ func (j *JIMM) UpdateApplicationOffer(ctx context.Context, controller *dbmodel.C
 		return nil
 	}
 
-	api, err := j.dial(ctx, controller, offer.Model.ResourceTag())
+	api, err := j.dial(
+		ctx,
+		&offer.Model.Controller,
+		names.ModelTag{},
+		permission{
+			resource: jimmnames.NewApplicationOfferTag(offer.UUID).String(),
+			relation: "admin",
+		},
+	)
 	if err != nil {
 		return errors.E(op, err)
 	}
@@ -769,7 +794,16 @@ func (j *JIMM) doApplicationOfferAdmin(ctx context.Context, user *openfga.User,
 	if !isOfferAdmin {
 		return errors.E(op, errors.CodeUnauthorized, "unauthorized")
 	}
-	api, err := j.dial(ctx, &offer.Model.Controller, names.ModelTag{})
+	// add offer admin claim
+	api, err := j.dial(
+		ctx,
+		&offer.Model.Controller,
+		names.ModelTag{},
+		permission{
+			resource: jimmnames.NewApplicationOfferTag(offer.UUID).String(),
+			relation: "admin",
+		},
+	)
 	if err != nil {
 		return errors.E(op, err)
 	}

internal/jimm/jimm.go

@@ -108,21 +108,34 @@ type Authenticator interface {
 	Authenticate(ctx context.Context, req *jujuparams.LoginRequest) (*openfga.User, error)
 }
 
+type permission struct {
+	resource string
+	relation string
+}
+
 // dial dials the controller and model specified by the given Controller
 // and ModelTag. If no Dialer has been configured then an error with a
 // code of CodeConnectionFailed will be returned.
-func (j *JIMM) dial(ctx context.Context, ctl *dbmodel.Controller, modelTag names.ModelTag) (API, error) {
+func (j *JIMM) dial(ctx context.Context, ctl *dbmodel.Controller, modelTag names.ModelTag, permissons ...permission) (API, error) {
 	if j == nil || j.Dialer == nil {
 		return nil, errors.E(errors.CodeConnectionFailed, "no dialer configured")
 	}
-	return j.Dialer.Dial(ctx, ctl, modelTag, nil)
+	var permissionMap map[string]string
+	if len(permissons) > 0 {
+		permissionMap = make(map[string]string, len(permissons))
+		for _, p := range permissons {
+			permissionMap[p.resource] = p.relation
+		}
+	}
+
+	return j.Dialer.Dial(ctx, ctl, modelTag, permissionMap)
 }
 
 // A Dialer provides a connection to a controller.
 type Dialer interface {
 	// Dial creates an API connection to a controller. If the given
 	// model-tag is non-zero the connection will be to that model,
-	// otherwise the connection is to the controller. After sucessfully
+	// otherwise the connection is to the controller. After successfully
 	// dialing the controller the UUID, AgentVersion and HostPorts fields
 	// in the given controller should be updated to the values provided
 	// by the controller.

internal/jimm/model.go

@@ -428,7 +428,15 @@ func (b *modelBuilder) CreateControllerModel() *modelBuilder {
 		return b
 	}
 
-	api, err := b.jimm.dial(b.ctx, b.controller, names.ModelTag{})
+	api, err := b.jimm.dial(
+		b.ctx,
+		b.controller,
+		names.ModelTag{},
+		permission{
+			resource: b.cloud.ResourceTag().String(),
+			relation: "add-model",
+		},
+	)
 	if err != nil {
 		b.err = errors.E(err)
 		return b