Validators for EscrowTerms seller secrets

packages/payload/packages/payments/src/Escrow/validators/escrow/index.ts

@@ -7,3 +7,4 @@ export * from './buyerSecret'
 export * from './nbfExp'
 export * from './paymentAuthorities'
 export * from './seller'
+export * from './sellerSecret'

packages/payload/packages/payments/src/Escrow/validators/escrow/sellerSecret.ts

@@ -0,0 +1,75 @@
+import { assertEx } from '@xylabs/assert'
+import { Hash } from '@xylabs/hex'
+import { isBoundWitnessWithMeta } from '@xyo-network/boundwitness-model'
+import { BoundWitnessValidator } from '@xyo-network/boundwitness-validator'
+import { Payload, WithMeta } from '@xyo-network/payload-model'
+
+import { EscrowTerms } from '../../Terms'
+import { EscrowTermsValidationFunction } from '../types'
+
+const name = 'EscrowTerms.sellerSecret'
+
+/**
+ * Returns a function that validates the escrow terms for sellerSecret
+ * @returns A function that validates the escrow terms for sellerSecret
+ */
+export const sellerSecretExistsValidator: EscrowTermsValidationFunction = (terms: EscrowTerms) => {
+  // Validate we have sellerSecret
+  const sellerSecret = terms.sellerSecret
+  if (!sellerSecret || sellerSecret.length === 0) {
+    console.log(`${name}: No sellerSecret: ${terms.sellerSecret}`)
+    return false
+  }
+  return true
+}
+
+/**
+ * Returns a function that validates the escrow terms for the existence of the sellerSecret in the dictionary
+ * @param dictionary Payload dictionary of the escrow terms
+ * @returns A function that validates the escrow terms for the existence of the sellerSecret in the dictionary
+ */
+export const getSellerSecretSuppliedValidator = (dictionary: Record<Hash, WithMeta<Payload>>): EscrowTermsValidationFunction => {
+  return (terms: EscrowTerms) => {
+    const sellerSecret = assertEx(terms.sellerSecret, () => `${name}: No sellerSecret: ${terms.sellerSecret}`)
+    if (!dictionary[sellerSecret]) {
+      console.log(`${name}: Payload not supplied for sellerSecret: ${sellerSecret}`)
+      return false
+    }
+    return true
+  }
+}
+
+/**
+ * Returns a function that validates the escrow terms for the existence of the sellerSecret signed by the seller
+ * @param dictionary Payload dictionary of the escrow terms
+ * @returns A function that validates the escrow terms for the existence of the sellerSecret signed by the seller
+ */
+export const getSellerSecretSignedValidator = (dictionary: Record<Hash, WithMeta<Payload>>): EscrowTermsValidationFunction => {
+  return async (terms: EscrowTerms) => {
+    const seller = assertEx(terms.seller, () => `${name}: No seller: ${terms.seller}`)
+    const sellerSecret = assertEx(terms.sellerSecret, () => `${name}: No sellerSecret: ${terms.sellerSecret}`)
+    // Seller-signed seller secrets
+    const sellerSecretBWs = Object.values(dictionary)
+      // Find all BoundWitnesses
+      .filter(isBoundWitnessWithMeta)
+      // That contain the seller secret
+      .filter((bw) => bw.payload_hashes.includes(sellerSecret))
+      // That are signed by all the sellers
+      .filter((bw) => seller.every((sellerAddress) => bw.addresses.includes(sellerAddress)))
+
+    // If there are no sellerSecret BWs, return false
+    if (sellerSecretBWs.length === 0) {
+      console.log(`${name}: No BoundWitnesses supplied for sellerSecret: ${sellerSecret}`)
+      return false
+    }
+
+    // Ensure each BW supplied for the sellerSecret is valid
+    const errors = await Promise.all(sellerSecretBWs.map((bw) => new BoundWitnessValidator(bw).validate()))
+    const validBoundWitnesses = errors.every((errors) => errors.length === 0)
+    if (!validBoundWitnesses) {
+      console.log(`${name}: Invalid BoundWitnesses supplied for sellerSecret: ${sellerSecret}`)
+      return false
+    }
+    return true
+  }
+}