Re-added code to clean branch

content/_code-samples/build-a-wallet/desktop-js/library/8_helpers.js

@@ -0,0 +1,102 @@
+const fetch = require('node-fetch')
+const toml = require('toml');
+const { convertHexToString } = require("xrpl/dist/npm/utils/stringConversion");
+
+const lsfDisallowXRP = 0x00080000;
+
+/*  Example lookups
+
+    |------------------------------------|---------------|-----------|
+    | Address                            | Domain        | Verified  |
+    |------------------------------------|---------------|-----------|
+    | rsA2LpzuawewSBQXkiju3YQTMzW13pAAdW | mduo13.com    | YES       |
+    | rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn | xrpl.org      | NO        |
+    | rPT1Sjq2YGrBMTttX4GZHjKu9dyfzbpAYe | n/a           | NO        |
+    |------------------------------------|---------------|-----------|
+ */
+
+/**
+ * Check a potential destination address's details, and pass them back to the "Send XRP" dialog:
+ * - Is the account funded? If not, payments below the reserve base will fail
+ * - Do they have DisallowXRP enabled? If so, the user should be warned they don't want XRP, but can click through.
+ * - Do they have a verified Domain? If so, we want to show the user the associated domain info.
+ *
+ * @param accountData
+ * @returns {Promise<{domain: string, verified: boolean}|{domain: string, verified: boolean}>}
+ */
+async function checkDestination(accountData) {
+    const accountStatus = {
+        "funded": null,
+        "disallow_xrp": null,
+        "domain_verified": null,
+        "domain_str": "" // the decoded domain, regardless of verification
+    }
+
+    accountStatus["disallow_xrp"] = !!(accountData & lsfDisallowXRP);
+
+    return verifyAccountDomain(accountData)
+}
+
+/**
+ * Verify an account using a xrp-ledger.toml file.
+ * https://xrpl.org/xrp-ledger-toml.html#xrp-ledgertoml-file
+ *
+ * @param accountData
+ * @returns {Promise<{domain: string, verified: boolean}>}
+ */
+async function verifyAccountDomain(accountData) {
+    const domainHex = accountData["Domain"]
+    if (!domainHex) {
+        return {
+            domain:"",
+            verified: false
+        }
+    }
+
+    let verified = false
+    const domain = convertHexToString(domainHex)
+    const tomlUrl = `https://${domain}/.well-known/xrp-ledger.toml`
+    const tomlResponse = await fetch(tomlUrl)
+    const tomlData = await tomlResponse.text()
+    const parsedToml = toml.parse(tomlData)
+    const tomlAccounts = parsedToml["ACCOUNTS"]
+
+    for (const tomlAccount of tomlAccounts) {
+        if (tomlAccount["address"] === accountData["Account"]) {
+            verified = true
+        }
+    }
+
+    return {
+        domain: domain,
+        verified: verified
+    }
+}
+
+/**
+ * Verifies if a given address has validated status
+ *
+ * @param accountAddress
+ * @param client
+ * @returns {Promise<{domain: string, verified: boolean}>}
+ */
+async function verify(accountAddress, client) {
+    // Reference: https://xrpl.org/account_info.html
+    const request = {
+        "command": "account_info",
+        "account": accountAddress,
+        "ledger_index": "validated"
+    }
+
+    try {
+        const response = await client.request(request)
+        return await checkDestination(response.result.account_data)
+    } catch {
+        return {
+            domain: 'domain',
+            verified: false
+        }
+    }
+}
+
+module.exports = { verify }