add get public key method to account

src/ocean/Account.ts

@@ -1,4 +1,5 @@
 import BigNumber from "bignumber.js"
+import * as EthJsUtils from "ethereumjs-util"
 import Keeper from "../keeper/Keeper"
 import Web3Provider from "../keeper/Web3Provider"
 import Balance from "../models/Balance"
@@ -33,9 +34,19 @@ export default class Account extends OceanBase {
         return this.balance
     }
 
-    // Transactions with gas cost
     public async requestTokens(amount: number): Promise<number> {
         await (await Keeper.getInstance()).market.requestTokens(amount, this.id)
         return amount
     }
+
+    public async getPublicKey(): Promise<string> {
+
+        const web3 = Web3Provider.getWeb3()
+
+        const msg = web3.utils.sha3(this.getId())
+        const sig = await web3.eth.sign(msg, this.getId())
+        const {v, r, s} = EthJsUtils.fromRpcSig(sig)
+
+        return EthJsUtils.ecrecover(EthJsUtils.toBuffer(msg), v, r, s).toString("hex")
+    }
 }

src/ocean/Ocean.ts

@@ -112,7 +112,7 @@ export default class Ocean {
                     owner: did,
                 },
                 {
-                    publicKeyBase58: publisher.getId(),
+                    publicKeyBase58: publisher.getPublicKey(),
                 },
             ],
             service: [

test/ocean/Account.test.ts

@@ -75,4 +75,14 @@ describe("Account", () => {
             assert(tokensGranted === tokens)
         })
     })
+
+    describe("#getPublicKey()", () => {
+
+        it("should get the public key of an account", async () => {
+            const publicKey = await accounts[1].getPublicKey()
+            assert(publicKey)
+
+            assert(publicKey.length === 128)
+        })
+    })
 })