Added support for private network parameters

index.js

@@ -37,6 +37,14 @@ class Common {
       } else {
         throw new Error(`Chain with name ${chain} not supported`)
       }
+    } else if (typeof (chain) === 'object') {
+      const required = ['networkId', 'genesis', 'hardforks', 'bootstrapNodes']
+      for (let param of required) {
+        if (chain[param] === undefined) {
+          throw new Error(`Missing equired chain parameter: ${param}`)
+        }
+      }
+      this._chainParams = chain
     } else {
       throw new Error('Wrong input format')
     }
@@ -362,7 +370,7 @@ class Common {
    * @returns {String} chain name (lower case)
    */
   chainName () {
-    return chainParams['names'][this.chainId()]
+    return chainParams['names'][this.chainId()] || this._chainParams['name']
   }
 
   /**

tests/chains.js

@@ -60,4 +60,18 @@ tape('[Common]: Initialization / Chain params', function (t) {
 
     st.end()
   })
+
+  t.test('Should be able to set custom chain parameters', function (st) {
+    let chainParams = require('./testnet.json')
+    let c = new Common(chainParams, 'byzantium')
+    st.equal(c.chainName(), 'testnet', 'should initialize with chain name')
+    st.equal(c.chainId(), 12345, 'should return correct chain Id')
+    st.equal(c.networkId(), 12345, 'should return correct network Id')
+    st.equal(c.genesis().hash, '0xaa00000000000000000000000000000000000000000000000000000000000000', 'should return correct genesis hash')
+    st.equal(c.hardforks()[3]['block'], 3, 'should return correct hardfork data')
+    st.equal(c.bootstrapNodes()[1].ip, '10.0.0.2', 'should return a bootstrap node array')
+    st.equal(c.hardfork(), 'byzantium', 'should return correct hardfork name')
+
+    st.end()
+  })
 })