Use of type VerifiableCredential.kt as type for serialization

[magnusk85]

Hello walt.id team,

i m actually using your SSI KIT in my development for a GAIA-X capable app. Here i tried to use the VerifiableCredential class contained in the SSI KIT repo as a type for serialization. My use case is that i want to store a Verifiable Credential object in my local Postgresql database. I use Postgresql because it is able to store json blobs. For that it has to serialize the object. Here is my table class:

val format = Json { prettyPrint = true }

object CredentialTable : Table("Verifiable Credentials") {
val id = varchar("credential_id", 10)
val name = text("credential_name")
val credential = json("Verifiable Credential", format)
}

But this is not possbile because the class which is used for serialization needs to have a @serializable annotation (this is not the case in the VerifiableCredential class). I also cannot inherit this class for a new class which could be added with the annotation because of the internal constructor ( Verfiable Credential class has no public one ).

My question is: Is there a possibility to get the serialization with your VerifiableCredential class done or do i have to have to write my own VerifiableCredntial class?

I appreciate your advice and help.

Thank you,

Magnus

[mikeplotean]

Hi, VerifiableCredential has 3 methods that can help with serialization:

• toJsonObject - returns a kotlinx.serialization.json.JsonObject
• toJsonElement - returns a kotlinx.serialization.json.JsonElement
• toJson - returns the credential json representation as a String