Expose etherscan instance

.changeset/beige-tomatoes-act.md

@@ -0,0 +1,5 @@
+---
+"@nomicfoundation/hardhat-verify": patch
+---
+
+Expose an `Etherscan` instance through `network.connect()` for advanced use cases. This version also adds a `customApiCall` method to the Etherscan instance, allowing custom requests to the Etherscan API ([#7644](https://github.com/NomicFoundation/hardhat/issues/7644))

v-next/hardhat-verify/README.md

@@ -85,6 +85,78 @@ await verifyContract(
 
 > Note: The `verifyContract` function is not re-exported from the Hardhat toolboxes, so you need to install the plugin and import it directly from `@nomicfoundation/hardhat-verify/verify`.
 
+## Advanced Usage for Plugin Authors
+
+If you're building a Hardhat plugin that needs direct access to the Etherscan API (for example, to verify proxy contracts or make custom API calls), you can access the Etherscan instance through `network.connect()`.
+
+### Accessing the Etherscan Instance
+
+```typescript
+import type { HardhatRuntimeEnvironment } from "hardhat/types";
+
+export async function myCustomVerificationTask(hre: HardhatRuntimeEnvironment) {
+  const { verifier } = await hre.network.connect();
+
+  // Access Etherscan instance
+  const etherscan = verifier.etherscan;
+
+  // Check if a contract is already verified
+  const isVerified = await etherscan.isVerified("0x1234...");
+
+  // Get the contract URL on the block explorer
+  const url = await etherscan.getContractUrl("0x1234...");
+
+  // Submit a contract for verification
+  const guid = await etherscan.verify({
+    contractAddress: "0x1234...",
+    compilerInput: {
+      /* compiler input JSON */
+    },
+    contractName: "contracts/MyContract.sol:MyContract",
+    compilerVersion: "v0.8.19+commit.7dd6d404",
+    constructorArguments: "0x...",
+  });
+
+  // Poll for verification status
+  const result = await etherscan.pollVerificationStatus(
+    guid,
+    "0x1234...",
+    "MyContract",
+  );
+}
+```
+
+### Making Custom API Calls
+
+For API endpoints not covered by the standard methods, use `customApiCall()`:
+
+```typescript
+const { verifier } = await hre.network.connect();
+
+// Make a custom API call (apikey and chainid are added automatically)
+const response = await verifier.etherscan.customApiCall({
+  module: "contract",
+  action: "getsourcecode",
+  address: "0x1234...",
+});
+
+// Check the response
+if (response.status === "1") {
+  console.log("Contract source:", response.result);
+} else {
+  console.error("Error:", response.message);
+}
+```
+
+### API Reference
+
+For complete type definitions and available methods, see the exported types:
+
+- `Etherscan` - The main interface for Etherscan API access
+- `EtherscanResponseBody` - Structure of API response bodies
+- `EtherscanCustomApiCallOptions` - Options for custom API calls
+- `EtherscanVerifyArgs` - Arguments for contract verification
+
 ### Build profiles and verification
 
 When no build profile is specified, this plugin defaults to `production`. However, tasks like `build` and `run` default to the `default` build profile. If your contracts are compiled with a different profile than the one used for verification, the compiled bytecode may not match the deployed bytecode, causing verification to fail.

v-next/hardhat-verify/package.json

@@ -14,7 +14,8 @@
   "types": "dist/src/index.d.ts",
   "exports": {
     ".": "./dist/src/index.js",
-    "./verify": "./dist/src/verify.js"
+    "./verify": "./dist/src/verify.js",
+    "./types": "./dist/src/types.js"
   },
   "keywords": [
     "ethereum",

v-next/hardhat-verify/src/index.ts

@@ -10,6 +10,7 @@ const hardhatPlugin: HardhatPlugin = {
   id: "hardhat-verify",
   hookHandlers: {
     config: () => import("./internal/hook-handlers/config.js"),
+    network: () => import("./internal/hook-handlers/network.js"),
   },
   tasks: [
     verifyTask,

v-next/hardhat-verify/src/internal/etherscan.ts

@@ -1,13 +1,16 @@
 import type {
+  EtherscanCustomApiCallOptions,
   EtherscanChainListResponse,
   EtherscanGetSourceCodeResponse,
   EtherscanResponse,
+  EtherscanResponseBody,
+  EtherscanVerifyArgs,
+  LazyEtherscan,
 } from "./etherscan.types.js";
 import type {
   VerificationProvider,
   VerificationResponse,
   VerificationStatusResponse,
-  BaseVerifyFunctionArgs,
   CreateEtherscanOptions,
   ResolveConfigOptions,
 } from "./types.js";
@@ -20,6 +23,7 @@ import type {
   ChainDescriptorsConfig,
   VerificationProvidersConfig,
 } from "hardhat/types/config";
+import type { EthereumProvider } from "hardhat/types/providers";
 
 import { HardhatError } from "@nomicfoundation/hardhat-errors";
 import { toBigInt } from "@nomicfoundation/hardhat-utils/bigint";
@@ -42,10 +46,6 @@ const VERIFICATION_STATUS_POLLING_SECONDS = 3;
 
 export const ETHERSCAN_API_URL = "https://api.etherscan.io/v2/api";
 
-export interface EtherscanVerifyFunctionArgs extends BaseVerifyFunctionArgs {
-  constructorArguments: string;
-}
-
 let supportedChainsCache: ChainDescriptorsConfig | undefined;
 
 export class Etherscan implements VerificationProvider {
@@ -273,7 +273,7 @@ export class Etherscan implements VerificationProvider {
     contractName,
     compilerVersion,
     constructorArguments,
-  }: EtherscanVerifyFunctionArgs): Promise<string> {
+  }: EtherscanVerifyArgs): Promise<string> {
     const body = {
       contractaddress: contractAddress,
       sourceCode: JSON.stringify(compilerInput),
@@ -462,6 +462,67 @@ export class Etherscan implements VerificationProvider {
       { message: etherscanResponse.message },
     );
   }
+
+  public async customApiCall(
+    params: Record<string, unknown>,
+    options: EtherscanCustomApiCallOptions = { method: "GET" },
+  ): Promise<EtherscanResponseBody> {
+    const queryParams = {
+      chainid: this.chainId,
+      apikey: this.apiKey,
+      ...params,
+    };
+
+    let response: HttpResponse;
+    try {
+      if (options.method === "GET") {
+        response = await getRequest(
+          this.apiUrl,
+          { queryParams },
+          this.dispatcherOrDispatcherOptions,
+        );
+      } else {
+        response = await postFormRequest(
+          this.apiUrl,
+          options.body,
+          { queryParams },
+          this.dispatcherOrDispatcherOptions,
+        );
+      }
+    } catch (error) {
+      ensureError(error);
+      throw new HardhatError(
+        HardhatError.ERRORS.HARDHAT_VERIFY.GENERAL.EXPLORER_REQUEST_FAILED,
+        {
+          name: this.name,
+          url: this.apiUrl,
+          errorMessage:
+            error.cause instanceof Error ? error.cause.message : error.message,
+        },
+      );
+    }
+
+    const responseBody =
+      /* eslint-disable-next-line @typescript-eslint/consistent-type-assertions
+      -- Cast to EtherscanResponseBody because that's what we expect from the API */
+      (await response.body.json()) as EtherscanResponseBody;
+
+    const isSuccessStatusCode =
+      response.statusCode >= 200 && response.statusCode <= 299;
+    if (!isSuccessStatusCode) {
+      throw new HardhatError(
+        HardhatError.ERRORS.HARDHAT_VERIFY.GENERAL.EXPLORER_REQUEST_STATUS_CODE_ERROR,
+        {
+          name: this.name,
+          url: this.apiUrl,
+          statusCode: response.statusCode,
+          errorMessage: String(responseBody.result),
+        },
+      );
+    }
+
+    return responseBody;
+  }
 }
 
 class EtherscanVerificationResponse implements VerificationResponse {
@@ -523,3 +584,109 @@ class EtherscanVerificationStatusResponse
     return this.status === 1;
   }
 }
+
+export class LazyEtherscanImpl implements LazyEtherscan {
+  readonly #provider: EthereumProvider;
+  readonly #networkName: string;
+  readonly #chainDescriptors: ChainDescriptorsConfig;
+  readonly #verificationProvidersConfig: VerificationProvidersConfig;
+
+  #etherscan: Etherscan | undefined;
+
+  constructor(
+    provider: EthereumProvider,
+    networkName: string,
+    chainDescriptors: ChainDescriptorsConfig,
+    verificationProvidersConfig: VerificationProvidersConfig,
+  ) {
+    this.#provider = provider;
+    this.#networkName = networkName;
+    this.#chainDescriptors = chainDescriptors;
+    this.#verificationProvidersConfig = verificationProvidersConfig;
+  }
+
+  /**
+   * Lazily initializes the underlying Etherscan verification provider and caches
+   * the created instance so that subsequent calls reuse the same object.
+   */
+  async #getEtherscan(): Promise<Etherscan> {
+    if (this.#etherscan === undefined) {
+      const { createVerificationProviderInstance } = await import(
+        "./verification.js"
+      );
+
+      this.#etherscan =
+        /* eslint-disable-next-line @typescript-eslint/consistent-type-assertions
+        -- Cast to Etherscan because we know the provider name is "etherscan" */
+        (await createVerificationProviderInstance({
+          provider: this.#provider,
+          networkName: this.#networkName,
+          chainDescriptors: this.#chainDescriptors,
+          verificationProviderName: "etherscan",
+          verificationProvidersConfig: this.#verificationProvidersConfig,
+        })) as Etherscan;
+    }
+    return this.#etherscan;
+  }
+
+  public async getChainId(): Promise<string> {
+    const etherscan = await this.#getEtherscan();
+    return etherscan.chainId;
+  }
+
+  public async getName(): Promise<string> {
+    const etherscan = await this.#getEtherscan();
+    return etherscan.name;
+  }
+
+  public async getUrl(): Promise<string> {
+    const etherscan = await this.#getEtherscan();
+    return etherscan.url;
+  }
+
+  public async getApiUrl(): Promise<string> {
+    const etherscan = await this.#getEtherscan();
+    return etherscan.apiUrl;
+  }
+
+  public async getApiKey(): Promise<string> {
+    const etherscan = await this.#getEtherscan();
+    return etherscan.apiKey;
+  }
+
+  public async getContractUrl(address: string): Promise<string> {
+    const etherscan = await this.#getEtherscan();
+    return etherscan.getContractUrl(address);
+  }
+
+  public async isVerified(address: string): Promise<boolean> {
+    const etherscan = await this.#getEtherscan();
+    return etherscan.isVerified(address);
+  }
+
+  public async verify(args: EtherscanVerifyArgs): Promise<string> {
+    const etherscan = await this.#getEtherscan();
+    return etherscan.verify(args);
+  }
+
+  public async pollVerificationStatus(
+    guid: string,
+    contractAddress: string,
+    contractName: string,
+  ): Promise<{ success: boolean; message: string }> {
+    const etherscan = await this.#getEtherscan();
+    return etherscan.pollVerificationStatus(
+      guid,
+      contractAddress,
+      contractName,
+    );
+  }
+
+  public async customApiCall(
+    params: Record<string, unknown>,
+    options?: EtherscanCustomApiCallOptions,
+  ): Promise<EtherscanResponseBody> {
+    const etherscan = await this.#getEtherscan();
+    return etherscan.customApiCall(params, options);
+  }
+}