feat: add snjs package

packages/snjs/lib/Services/Challenge/ChallengeResponse.ts

@@ -0,0 +1,33 @@
+import { isNullOrUndefined } from '@standardnotes/utils'
+import { Challenge } from './Challenge'
+import {
+  ChallengeResponseInterface,
+  ChallengeValidation,
+  ChallengeValue,
+  ChallengeArtifacts,
+} from '@standardnotes/services'
+
+export class ChallengeResponse implements ChallengeResponseInterface {
+  constructor(
+    public readonly challenge: Challenge,
+    public readonly values: ChallengeValue[],
+    public readonly artifacts?: ChallengeArtifacts,
+  ) {
+    Object.freeze(this)
+  }
+
+  getValueForType(type: ChallengeValidation): ChallengeValue {
+    const value = this.values.find((value) => value.prompt.validation === type)
+    if (isNullOrUndefined(value)) {
+      throw Error('Could not find value for validation type ' + type)
+    }
+    return value
+  }
+
+  getDefaultValue(): ChallengeValue {
+    if (this.values.length > 1) {
+      throw Error('Attempting to retrieve default response value when more than one value exists')
+    }
+    return this.values[0]
+  }
+}