add address validation

package.json

@@ -21,6 +21,7 @@
   "license": "GPL-3.0",
   "dependencies": {
     "axios": "^0.18.0",
+    "chai": "^4.1.2",
     "crypto-js": "^3.1.9-1",
     "elliptic": "^6.4.0",
     "google-protobuf": "^3.5.0",

src/utils/account.js

@@ -2,6 +2,9 @@ const byteArray2hexStr = require("./bytes").byteArray2hexStr;
 const base64EncodeToString = require("../lib/code").base64EncodeToString;
 const {genPriKey, getAddressFromPriKey} = require("./crypto");
 
+/**
+ * Generate a new account
+ */
 function generateAccount() {
   let priKeyBytes = genPriKey();
   let addressBytes = getAddressFromPriKey(priKeyBytes);
@@ -15,7 +18,3 @@ function generateAccount() {
     password,
   }
 }
-
-module.exports = {
-  generateAccount,
-};

src/utils/address.js

@@ -0,0 +1,24 @@
+const ADDRESS_PREFIX = "a0";
+const ADDRESS_SIZE = 42;
+
+
+function isAddressValid(address) {
+
+  if (!address || address.length === 0) {
+    return false;
+  }
+
+  if (address.length !== ADDRESS_SIZE) {
+    return false;
+  }
+
+  if (address.substr(0, 2).toUpperCase() !== ADDRESS_PREFIX.toUpperCase()) {
+    return false;
+  }
+
+  return true;
+}
+
+module.exports = {
+  isAddressValid,
+};

test/address.js

@@ -0,0 +1,34 @@
+const { assert } = require('chai');
+const {isAddressValid} = require("../src/utils/address");
+
+describe('address', () => {
+
+  it('accept valid address', async () => {
+    assert.isTrue(isAddressValid("A00D0CF9099287F92B98BCDF28D40684A1A70C1E83"));
+    assert.isTrue(isAddressValid("A030975C3437C94118C924241ADF2A937010889B6D"));
+    assert.isTrue(isAddressValid("A08B5B1D533EFA3D098D34D3CA4FD908130856DA4B"));
+  });
+
+  it('reject addresses of invalid length', async () => {
+    assert.isFalse(isAddressValid("A00D0CF9099287F92B98BCDF28DA0684A11E83"));
+    assert.isFalse(isAddressValid("A00D0CF9099287F92B98BCDF28DA01E83"));
+    assert.isFalse(isAddressValid("A00D0CF9099287F92B98BCDF1E83"));
+    assert.isFalse(isAddressValid("A00D0CF9099287F92B91E83"));
+    assert.isFalse(isAddressValid("A00D0CF9099287F1E83"));
+    assert.isFalse(isAddressValid("A00D0CF90991E83"));
+    assert.isFalse(isAddressValid("A00D0C1E83"));
+    assert.isFalse(isAddressValid(""));
+  });
+
+  it('reject invalid addresses', async () => {
+    assert.isFalse(isAddressValid(""));
+    assert.isFalse(isAddressValid());
+    assert.isFalse(isAddressValid(null));
+    assert.isFalse(isAddressValid(undefined));
+    assert.isFalse(isAddressValid(false));
+    assert.isFalse(isAddressValid(true));
+    assert.isFalse(isAddressValid(1));
+    assert.isFalse(isAddressValid(0));
+  });
+
+});