export new useful functions from internal helper methods (#821)

* export new useful functions from internal helper methods
* add tests for browser

examples/wasm_browser/index.js

@@ -15,7 +15,7 @@ log('mnemonic')
 /////////////////////////////////
 // Derive key
 
-let key = wasm.keyDerive(mnemonic, 'm/44\'/461\'/0/0/0', '')
+let key = wasm.keyDerive(mnemonic, "m/44'/461'/0/0/0", '')
 
 log('<h2>[wasm.key_derive]</h2>')
 log(`<b>address      </b> ${key.address}`)
@@ -29,7 +29,7 @@ log(`<b>private base64</b> ${key.private_base64}`)
 /////////////////////////////////
 // Recover key
 
-let recovered_key = wasm.keyRecover(Buffer.from('6a1a68774457742a8bc69db5491df5ae7677687d49e1003a78e2d60959d5f7a7',"hex"))
+let recovered_key = wasm.keyRecover(Buffer.from('6a1a68774457742a8bc69db5491df5ae7677687d49e1003a78e2d60959d5f7a7', 'hex'))
 
 log('<h2>[wasm.key_recover]</h2>')
 log(`<b>address      </b> ${recovered_key.address}`)
@@ -44,16 +44,16 @@ log(`<b>private array</b> ${recovered_key.private_raw}`)
 log('<h2>[wasm.sign_transaction]</h2>')
 
 const unsigned_tx = {
-  'to': 't17uoq6tp427uzv7fztkbsnn64iwotfrristwpryy',
-  'from': key.address,
-  'nonce': 1,
-  'value': '100000',
-  'gasprice': '2500',
-  'gaslimit': 25000,
-  'gaspremium': '2500',
-  'gasfeecap': '2500',
-  'method': 4,
-  'params': '',
+  to: 't17uoq6tp427uzv7fztkbsnn64iwotfrristwpryy',
+  from: key.address,
+  nonce: 1,
+  value: '100000',
+  gasprice: '2500',
+  gaslimit: 25000,
+  gaspremium: '2500',
+  gasfeecap: '2500',
+  method: 4,
+  params: '',
 }
 
 console.log('About to call wasm.transactionSignLotus():')
@@ -76,10 +76,25 @@ mnemonic = js.generateMnemonic()
 log('<h2>[js.mnemonic_generate]</h2>' + mnemonic)
 log('mnemonic')
 
+/////////////////////////////////
+// Validate Address
+
+let isValid_1 = js.validateAddressAsString('t17uoq6tp427uzv7fztkbsnn64iwotfrristwpryy')
+let isValid_2 = js.validateAddressAsString('t76uoq6tp427uzv7fztccsnn64iwotfrristwprzz')
+log('<h2>[js.validateAddressAsString]</h2>')
+log(`<b>t17uoq6tp427uzv7fztkbsnn64iwotfrristwpryy      </b> ${isValid_1}`)
+log(`<b>t76uoq6tp427uzv7fztccsnn64iwotfrristwprzz      </b> ${isValid_2}`)
+
+isValid_1 = js.validateAddressAsBytes(Buffer.from('01fd1d0f4dfcd7e99afcb99a8326b7dc459d32c62855', 'hex'))
+isValid_2 = js.validateAddressAsBytes(Buffer.from('07fd1d0f4dfcd7e99afcb99a8326b7dc459d32c62822', 'hex'))
+log('<h2>[js.validateAddressAsBytes]</h2>')
+log(`<b>01fd1d0f4dfcd7e99afcb99a8326b7dc459d32c62855      </b> ${isValid_1}`)
+log(`<b>07fd1d0f4dfcd7e99afcb99a8326b7dc459d32c62822      </b> ${isValid_2}`)
+
 /////////////////////////////////
 // Derive key
 
-key = js.keyDerive(mnemonic, 'm/44\'/461\'/0/0/0', '')
+key = js.keyDerive(mnemonic, "m/44'/461'/0/0/0", '')
 
 log('<h2>[js.key_derive]</h2>')
 log(`<b>address      </b> ${key.address}`)
@@ -93,7 +108,7 @@ log(`<b>private base64</b> ${key.private_base64}`)
 /////////////////////////////////
 // Recover key
 
-recovered_key = js.keyRecover(Buffer.from('6a1a68774457742a8bc69db5491df5ae7677687d49e1003a78e2d60959d5f7a7',"hex"))
+recovered_key = js.keyRecover(Buffer.from('6a1a68774457742a8bc69db5491df5ae7677687d49e1003a78e2d60959d5f7a7', 'hex'))
 
 log('<h2>[js.key_recover]</h2>')
 log(`<b>address      </b> ${recovered_key.address}`)

signer-npm/js/src/index.ts

@@ -17,6 +17,32 @@ export function generateMnemonic(): string {
   return bip39.generateMnemonic(256)
 }
 
+export function validateAddressAsString(address: string): boolean {
+  try {
+    addressAsBytes(address)
+    return true
+  } catch (error) {
+    return false
+  }
+}
+
+export function validateAddressAsBytes(bytes: Buffer): boolean {
+  try {
+    bytesToAddress(bytes, false)
+    return true
+  } catch (error) {
+    return false
+  }
+}
+
+export function parseAddress(address: string): Buffer {
+  return addressAsBytes(address)
+}
+
+export function encodeAddress(bytes: Buffer, isTestnet: boolean): string {
+  return bytesToAddress(bytes, isTestnet)
+}
+
 export function keyDeriveFromSeed(seed: string | Buffer, path: string): ExtendedKey {
   if (typeof seed === 'string') {
     seed = Buffer.from(seed, 'hex')