Fixed contract events (ethers-io#404).

src.ts/base-provider.ts

@@ -564,6 +564,10 @@ export class BaseProvider extends Provider {
                filter.address = this.resolveName(f.address);
             }
 
+            if (f.topics) {
+               filter.topics = f.topics;
+            }
+
             if (f.blockHash != null) {
                 filter.blockHash = f.blockHash;
             }

src.ts/json-rpc-provider.ts

@@ -118,7 +118,7 @@ export class JsonRpcSigner extends Signer {
             fromAddress
         ]).then((results) => {
             let tx = results[0];
-            let hexTx = (<any>this.constructor).hexlifyTransaction(tx);
+            let hexTx = (<any>this.provider.constructor).hexlifyTransaction(tx);
             hexTx.from = results[1];
             return this.provider.send("eth_sendTransaction", [ hexTx ]).then((hash) => {
                 return hash;

src.ts/url-json-rpc-provider.ts

@@ -12,7 +12,8 @@ export class UrlJsonRpcProvider extends JsonRpcProvider {
     constructor(network?: Networkish, apiKey?: string) {
         errors.checkAbstract(new.target, UrlJsonRpcProvider);
 
-        network = getNetwork((network == null) ? "homestead": network);
+        // Normalize the Network and API Key
+        network = new.target.getNetwork(network);
         apiKey = new.target.getApiKey(apiKey);
 
         let url = new.target.getUrl(network, apiKey);
@@ -39,6 +40,10 @@ export class UrlJsonRpcProvider extends JsonRpcProvider {
         return Promise.resolve([]);
     }
 
+    static getNetwork(network?: Networkish): Network {
+        return getNetwork((network == null) ? "homestead": network);
+    }
+
     // Return a defaultApiKey if null, otherwise validate the API key
     static getApiKey(apiKey: string): string {
         return apiKey;
@@ -50,5 +55,4 @@ export class UrlJsonRpcProvider extends JsonRpcProvider {
             operation: "getUrl"
         });
     }
-
 }