SSI fully qualified schema ID conversion

schema-utils.test.ts

describe('convert schema ID', () => {
  test('converts unqualified to fully qualified', () => {
    const result = convertToFullyQualified(
      'did:indy:sovrin',
      '2NPnMDv5Lh57gVZ3p3SYu3:2:e-KYC:1.0.0',
    )
    console.log(result)
    expect(result).toEqual(
      'did:indy:sovrin:2NPnMDv5Lh57gVZ3p3SYu3/anoncreds/v0/SCHEMA/e-KYC/1.0.0',
    )
  })

  test('converts fully qualified to unqualified', () => {
    const result = convertToUnqualified(
      'did:indy:sovrin:2NPnMDv5Lh57gVZ3p3SYu3/anoncreds/v0/SCHEMA/e-KYC/1.0.0',
    )
    console.log(result)
    expect(result).toEqual({
      ledger: 'did:indy:sovrin',
      schemaId: '2NPnMDv5Lh57gVZ3p3SYu3:2:e-KYC:1.0.0',
    })
  })
})

function convertToFullyQualified(
  didPrefix: string,
  unqualifiedSchemaId: string,
) {
  const [unqualifiedDid, objectTypeNumber, schemaName, schemaVersion] =
    unqualifiedSchemaId.split(':')
  const objectTypeString = mapObjectTypeNumberToString[objectTypeNumber]
  return `${didPrefix}:${unqualifiedDid}/anoncreds/v0/${objectTypeString}/${schemaName}/${schemaVersion}`
}

function convertToUnqualified(fullyQualified: string) {
  const ledger = fullyQualified.split(':').slice(0, -1).join(':')
  const [ledgerObject] = fullyQualified.split(':').slice(-1)

  const [
    unqualifiedDid,
    objectFamily,
    objectFamilyVersion,
    objectTypeString,
    schemaName,
    schemaVersion,
  ] = ledgerObject.split('/')
  const objectTypeNumber = mapObjectTypeStringToNumber[objectTypeString]
  return {
    ledger,
    schemaId: `${unqualifiedDid}:${objectTypeNumber}:${schemaName}:${schemaVersion}`,
  }
}

const mapObjectTypeNumberToString: Record<string, string> = {
  '2': 'SCHEMA',
}
const mapObjectTypeStringToNumber: Record<string, string> = {
  SCHEMA: '2',
}