chore: WalletDriver_Metamask class now extends WalletDriver_Ethereum.

src/utils/wallet/WalletDriver_Ethereum.ts

@@ -0,0 +1,226 @@
+/*-
+ *
+ * Hedera Mirror Node Explorer
+ *
+ * Copyright (C) 2021 - 2023 Hedera Hashgraph, LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+import {WalletDriver} from "@/utils/wallet/WalletDriver";
+import {routeManager} from "@/router";
+import {EntityID} from "@/utils/EntityID";
+import {BrowserProvider, ethers} from "ethers";
+import {NetworkEntry} from "@/schemas/NetworkRegistry";
+import {WalletDriverCancelError, WalletDriverError} from "@/utils/wallet/WalletDriverError";
+import {AccountByAddressCache} from "@/utils/cache/AccountByAddressCache";
+import {Transaction} from "@/schemas/HederaSchemas";
+import {waitFor} from "@/utils/TimerUtils";
+import {ContractResultByHashCache} from "@/utils/cache/ContractResultByHashCache";
+import {TransactionByTsCache} from "@/utils/cache/TransactionByTsCache";
+import {markRaw} from "vue";
+
+export abstract class WalletDriver_Ethereum extends WalletDriver {
+
+    protected provider: BrowserProvider|null = null
+
+    //
+    // Public (to be subclassed)
+    //
+
+    public async makeProvider(): Promise<BrowserProvider|null> {
+        throw this.toBeImplemented("makeProvider()")
+    }
+
+    public isCancelError(reason: unknown): boolean {
+        throw this.toBeImplemented("isCancelError(" + reason + ")")
+    }
+
+    //
+    // WalletDriver
+    //
+
+    public async connect(network: string): Promise<string[]> {
+        let result: string[]
+
+        // Sanity check
+        const networkEntry = routeManager.currentNetworkEntry.value
+        if (networkEntry.name !== network) {
+            throw this.connectFailure("Network inconsistency: bug")
+        }
+
+        const provider = await this.makeProvider()
+        if (provider !== null) {
+
+            // Switch wallet to network if needed
+            await this.switchToNetwork(provider, networkEntry)
+
+            // Collects account ids
+            result = await this.fetchAccountIds(provider)
+            if (result.length == 0) {
+                // Did the user cancel connection from the wallet ?
+                throw this.connectFailure("No account found")
+            }
+
+            this.provider = markRaw(provider)
+            // await this.provider.once('chainChanged', this.handleDisconnect);
+        } else {
+            throw this.extensionNotFound()
+        }
+
+        return Promise.resolve(result)
+    }
+
+    public async disconnect(): Promise<void> {
+        // this.provider?.off("chainChanged", this.handleDisconnect)
+        this.provider = null
+    }
+
+    public async associateToken(accountId: string, tokenId: string): Promise<string> {
+        let result: string
+
+        // https://stackoverflow.com/questions/76980638/how-do-you-associate-dissociate-an-hts-token-using-evm-transaction
+
+        const tokenAddress = EntityID.parse(tokenId)?.toAddress() ?? null
+        if (accountId !== null && tokenAddress !== null && this.provider !== null) {
+
+            const abi = ["function associate()"]
+            const signer = await this.provider.getSigner()
+            const contract = new ethers.Contract("0x" + tokenAddress, abi, signer)
+            try {
+                const transactionResult = await contract.associate();
+                const hederaTransaction = await this.waitForTransactionSurfacing(transactionResult.hash)
+                result = typeof hederaTransaction == "string" ? hederaTransaction : hederaTransaction.transaction_id
+            } catch(reason) {
+                throw this.makeCallFailure(reason, "associateToken")
+            }
+        } else {
+            throw this.callFailure("Invalid arguments")
+        }
+
+        return Promise.resolve(result)
+    }
+
+    public async dissociateToken(accountId: string, tokenId: string): Promise<string> {
+        let result: string
+
+        // https://stackoverflow.com/questions/76980638/how-do-you-associate-dissociate-an-hts-token-using-evm-transaction
+
+        const tokenAddress = EntityID.parse(tokenId)?.toAddress() ?? null
+        if (accountId !== null && tokenAddress !== null && this.provider !== null) {
+
+            const abi = ["function dissociate()"];
+            const signer = await this.provider.getSigner()
+            const contract = new ethers.Contract("0x" + tokenAddress, abi, signer)
+            try {
+                const transactionResult = await contract.dissociate();
+                const hederaTransaction = await this.waitForTransactionSurfacing(transactionResult.hash)
+                result = typeof hederaTransaction == "string" ? hederaTransaction : hederaTransaction.transaction_id
+            } catch(reason) {
+                throw this.makeCallFailure(reason, "dissociateToken")
+            }
+        } else {
+            throw this.callFailure("Invalid arguments")
+        }
+
+        return Promise.resolve(result)
+    }
+
+    public isConnected(): boolean {
+        return this.provider !== null
+    }
+
+    //
+    // Protected (for subclasses usage)
+    //
+
+    protected makeCallFailure(reason: unknown, extra: string): WalletDriverError {
+        if (this.isCancelError(reason)) {
+            throw new WalletDriverCancelError()
+        } else {
+            throw this.callFailure(extra)
+        }
+    }
+
+
+    //
+    // Private
+    //
+
+    private async switchToNetwork(provider: BrowserProvider, networkEntry: NetworkEntry): Promise<void> {
+
+        const chainId = networkEntry.sourcifySetup?.hexChainID()
+        if (chainId == null) {
+            throw this.connectFailure("Network " + networkEntry.name + " is not setup for use with wallet")
+        }
+
+        // Make sure that chainId is the current chain in Metamask
+        const walletChainId = await provider.send('eth_chainId', [])
+        if (walletChainId !== chainId) {
+            try {
+                // Try to switch
+                await provider.send("wallet_switchEthereumChain", [{ chainId: chainId }])
+            } catch(reason) {
+                if (this.isCancelError(reason)) {
+                    throw new WalletDriverCancelError()
+                } else {
+                    throw this.connectFailure("Make sure that 'Hedera " + networkEntry.name + "' network is added to " + this.name)
+                }
+            }
+        }
+    }
+
+    private async fetchAccountIds(provider: BrowserProvider): Promise<string[]> {
+        let result: string[] = []
+
+        const response = await provider.send("eth_requestAccounts", [])
+
+        for (const address of response ?? []) {
+            const accountInfo = address ? await AccountByAddressCache.instance.lookup(address) : null
+            if (accountInfo?.account) {
+                result.push(accountInfo.account)
+            }
+        }
+
+        return Promise.resolve(result)
+    }
+
+
+    private async waitForTransactionSurfacing(ethereumHash: Buffer): Promise<Transaction | string> {
+        let result: Promise<Transaction | string>
+
+        const hash = ethers.hexlify(ethereumHash)
+        try {
+            let counter = 10
+            let transaction: Transaction|null = null
+            while (counter > 0 && transaction === null) {
+                await waitFor(3000)
+                const contractInfo = await ContractResultByHashCache.instance.lookup(hash, true)
+                if (contractInfo !== null) {
+                    transaction = await TransactionByTsCache.instance.lookup(contractInfo.timestamp, true)
+                } else {
+                    transaction = null
+                }
+                counter -= 1
+            }
+            result = Promise.resolve(transaction ?? hash)
+        } catch {
+            result = Promise.resolve(hash)
+        }
+
+        return result
+    }
+
+
+}