refactor: make keyshare and myirma server db type constants typed

irma/cmd/keyshare-myirma.go

@@ -44,7 +44,7 @@ func init() {
 	flags.StringSlice("cors-allowed-origins", nil, "CORS allowed origins")
 	flags.Lookup("port").Header = `Server address and port to listen on`
 
-	flags.String("db-type", myirmaserver.DBTypePostgres, "Type of database to connect keyshare server to")
+	flags.String("db-type", string(myirmaserver.DBTypePostgres), "Type of database to connect keyshare server to")
 	flags.String("db", "", "Database server connection string")
 	flags.Lookup("db-type").Header = `Database configuration`
 

irma/cmd/keyshare-server.go

@@ -41,7 +41,7 @@ func init() {
 	flags.StringP("listen-addr", "l", "", "address at which to listen (default 0.0.0.0)")
 	flags.Lookup("port").Header = `Server address and port to listen on`
 
-	flags.String("db-type", keyshareserver.DBTypePostgres, "Type of database to connect keyshare server to")
+	flags.String("db-type", string(keyshareserver.DBTypePostgres), "Type of database to connect keyshare server to")
 	flags.String("db", "", "Database server connection string")
 	flags.Lookup("db-type").Header = `Database configuration`
 

server/keyshare/keyshareserver/conf.go

@@ -21,8 +21,8 @@ type DBType string
 var errUnknownDBType = errors.New("Unknown database type")
 
 const (
-	DBTypeMemory   = "memory"
-	DBTypePostgres = "postgres"
+	DBTypeMemory   DBType = "memory"
+	DBTypePostgres DBType = "postgres"
 )
 
 // Configuration contains configuration for the irmaserver library and irmad.

server/keyshare/myirmaserver/conf.go

@@ -17,8 +17,8 @@ type DBType string
 var errUnknownDBType = errors.New("Unknown database type")
 
 const (
-	DBTypeMemory   = "memory"
-	DBTypePostgres = "postgres"
+	DBTypeMemory   DBType = "memory"
+	DBTypePostgres DBType = "postgres"
 
 	SessionLifetimeDefault = 15 * 60 // seconds
 )