Merge pull request #594 from 0xProject/improvement/addCustomTslintRules

Add more tslint rules

3 files changed, 23 insertions, 9 deletions

diff --git a/packages/order-utils/src/order_hash.ts b/packages/order-utils/src/order_hash.ts
index 1cde72a73..108344a04 100644
--- a/packages/order-utils/src/order_hash.ts
+++ b/packages/order-utils/src/order_hash.ts
@@ -17,7 +17,8 @@ const INVALID_TAKER_FORMAT = 'instance.taker is not of a type(s) string';
  * We do not use BN anywhere else in the codebase.
  */
 function bigNumberToBN(value: BigNumber): BN {
-    return new BN(value.toString(), 10);
+    const base = 10;
+    return new BN(value.toString(), base);
 }
 
 /**
diff --git a/packages/order-utils/src/signature_utils.ts b/packages/order-utils/src/signature_utils.ts
index b511573a8..28a8e7241 100644
--- a/packages/order-utils/src/signature_utils.ts
+++ b/packages/order-utils/src/signature_utils.ts
@@ -72,6 +72,7 @@ export async function signOrderHashAsync(
     // v + r + s OR r + s + v, and different clients (even different versions of the same client)
     // return the signature params in different orders. In order to support all client implementations,
     // we parse the signature in both ways, and evaluate if either one is a valid signature.
+    // tslint:disable-next-line:custom-no-magic-numbers
     const validVParamValues = [27, 28];
     const ecSignatureVRS = parseSignatureHexAsVRS(signature);
     if (_.includes(validVParamValues, ecSignatureVRS.v)) {
@@ -95,11 +96,19 @@ export async function signOrderHashAsync(
 function parseSignatureHexAsVRS(signatureHex: string): ECSignature {
     const signatureBuffer = ethUtil.toBuffer(signatureHex);
     let v = signatureBuffer[0];
-    if (v < 27) {
-        v += 27;
+    // HACK: Sometimes v is returned as [0, 1] and sometimes as [27, 28]
+    // If it is returned as [0, 1], add 27 to both so it becomes [27, 28]
+    const lowestValidV = 27;
+    const isProperlyFormattedV = v < lowestValidV;
+    if (!isProperlyFormattedV) {
+        v += lowestValidV;
     }
-    const r = signatureBuffer.slice(1, 33);
-    const s = signatureBuffer.slice(33, 65);
+    // signatureBuffer contains vrs
+    const vEndIndex = 1;
+    const rsIndex = 33;
+    const r = signatureBuffer.slice(vEndIndex, rsIndex);
+    const sEndIndex = 65;
+    const s = signatureBuffer.slice(rsIndex, sEndIndex);
     const ecSignature: ECSignature = {
         v,
         r: ethUtil.bufferToHex(r),
diff --git a/packages/order-utils/test/signature_utils_test.ts b/packages/order-utils/test/signature_utils_test.ts
index 4b4de9217..e24fa0ce5 100644
--- a/packages/order-utils/test/signature_utils_test.ts
+++ b/packages/order-utils/test/signature_utils_test.ts
@@ -47,12 +47,13 @@ describe('Signature utils', () => {
     });
     describe('#generateSalt', () => {
         it('generates different salts', () => {
-            const equal = generatePseudoRandomSalt().eq(generatePseudoRandomSalt());
-            expect(equal).to.be.false();
+            const isEqual = generatePseudoRandomSalt().eq(generatePseudoRandomSalt());
+            expect(isEqual).to.be.false();
         });
         it('generates salt in range [0..2^256)', () => {
             const salt = generatePseudoRandomSalt();
             expect(salt.greaterThanOrEqualTo(0)).to.be.true();
+            // tslint:disable-next-line:custom-no-magic-numbers
             const twoPow256 = new BigNumber(2).pow(256);
             expect(salt.lessThan(twoPow256)).to.be.true();
         });
@@ -67,7 +68,8 @@ describe('Signature utils', () => {
             expect(isValid).to.be.false();
         });
         it('returns true if order hash is correct', () => {
-            const isValid = isValidOrderHash('0x' + Array(65).join('0'));
+            const orderHashLength = 65;
+            const isValid = isValidOrderHash('0x' + Array(orderHashLength).join('0'));
             expect(isValid).to.be.true();
         });
     });
@@ -111,10 +113,12 @@ describe('Signature utils', () => {
                     if (payload.method === 'eth_sign') {
                         const [address, message] = payload.params;
                         const signature = await web3Wrapper.signMessageAsync(address, message);
+                        // tslint:disable-next-line:custom-no-magic-numbers
+                        const rsvHex = `0x${signature.substr(130)}${signature.substr(2, 128)}`;
                         callback(null, {
                             id: 42,
                             jsonrpc: '2.0',
-                            result: `0x${signature.substr(130)}${signature.substr(2, 128)}`,
+                            result: rsvHex,
                         });
                     } else {
                         callback(null, { id: 42, jsonrpc: '2.0', result: [makerAddress] });