refactor: unit testable units and cleaner dep injection

go/internal/pusher/authorizer.go

@@ -12,12 +12,12 @@ var ErrUnauthorized = errors.New("unauthorized")
 
 // Authorizer validates whether a user can access a given channel.
 type Authorizer struct {
-	networkSvc network.Service
+	networkReader network.Reader
 }
 
 // NewAuthorizer creates a new channel authorizer.
-func NewAuthorizer(networkSvc network.Service) *Authorizer {
-	return &Authorizer{networkSvc: networkSvc}
+func NewAuthorizer(networkReader network.Reader) *Authorizer {
+	return &Authorizer{networkReader: networkReader}
 }
 
 // Authorize checks if the given humanID is allowed to subscribe to the channel.
@@ -51,7 +51,7 @@ func (a *Authorizer) Authorize(ctx context.Context, channelID, humanID string) e
 }
 
 func (a *Authorizer) authorizeNetwork(ctx context.Context, networkID, humanID string) error {
-	isMember, err := a.networkSvc.IsMember(ctx, networkID, humanID)
+	isMember, err := a.networkReader.IsMember(ctx, networkID, humanID)
 	if err != nil {
 		return err
 	}