tintinweb · tintinweb · Aug 5, 2022 · Aug 5, 2022 · Aug 5, 2022 · Aug 5, 2022
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,6 +1,12 @@
 # Change Log
 All notable changes will be documented in this file.
 
+## v0.2.0
+- new: new command to fetch & load interface declaration from etherscan.io #19
+
+![shell-fetch-interface](https://user-images.githubusercontent.com/2865694/183062446-c952b308-9fc7-49f9-8308-3eac09ca3b4a.gif)
+
+
 ## v0.1.2
 
 - fix: support require(), type, abstract, library

diff --git a/README.md b/README.md
@@ -85,6 +85,10 @@ BNB
     .help                                ... this help :)
     .exit                                ... exit the shell
 
+ Source:
+    .fetch 
+            interface <address> <name> [chain=mainnet] ... fetch and load an interface declaration from an ABI spec on etherscan.io
+
  Blockchain:
     .chain                         
             restart                      ... restart the blockchain service

diff --git a/bin/main.js b/bin/main.js
diff --git a/package-lock.json b/package-lock.json
diff --git a/package.json b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "solidity-shell",
-  "version": "0.1.2",
+  "version": "0.2.0",
   "description": "An interactive Solidity shell with lightweight session recording and remote compiler support",
   "main": "src/index.js",
   "bin": {
@@ -26,6 +26,7 @@
   ],
   "license": "MIT",
   "dependencies": {
+    "abi-to-sol": "^0.6.5",
     "ganache": "^7.0.4",
     "minimist": "^1.2.5",
     "readline-sync": "^1.4.10",

diff --git a/src/blockchain.js b/src/blockchain.js
@@ -56,14 +56,14 @@ class AbsBlockchainBase {
             })
         });
     }
-    
+
     methodCall(cmd, args) {
         return new Promise((resolve, reject) => {
             let func = this.web3.eth[cmd];
-            if(func === undefined) {
+            if (func === undefined) {
                 return reject("  🧨 Unsupported Method");
             }
-            if(typeof func === "function"){
+            if (typeof func === "function") {
                 func((err, result) => {
                     if (err) return reject(new Error(err));
                     return resolve(result);
@@ -74,21 +74,21 @@ class AbsBlockchainBase {
         });
     }
 
-    rpcCall(method, params){
+    rpcCall(method, params) {
         return new Promise((resolve, reject) => {
             let payload = {
-                "jsonrpc":"2.0",
-                "method":method,
-                "params":params === undefined ? [] : params,
-                "id":1
+                "jsonrpc": "2.0",
+                "method": method,
+                "params": params === undefined ? [] : params,
+                "id": 1
             }
             this.provider.send(payload, (error, result) => {
-                if(error)
+                if (error)
                     return reject(error);
                 return resolve(result);
             });
         });
-        
+
     }
 
     async deploy(contracts, callback) {
@@ -147,7 +147,7 @@ class BuiltinGanacheBlockchain extends AbsBlockchainBase {
         const defaultOptions = {
             logging: { quiet: true },
         };
-        this.options = {...defaultOptions, ...shell.settings.ganacheOptions};
+        this.options = { ...defaultOptions, ...shell.settings.ganacheOptions };
     }
 
     connect() {
@@ -165,14 +165,14 @@ class BuiltinGanacheBlockchain extends AbsBlockchainBase {
             this.web3 = new Web3(this.provider);
         });
 
-        
+
     }
 
     startService() {
         if (this.provider !== undefined) {
             return this.provider;
         }
-        
+
         this.provider = ganache.provider(this.options);
     }
     stopService() {
@@ -222,9 +222,9 @@ class ExternalProcessBlockchain extends AbsBlockchainBase {
             return this.proc;
         }
         this.log("ℹ️  ganache-mgr: starting temp. ganache instance ...\n »");
-        
+
         this.proc = require('child_process').spawn(this.shell.settings.ganacheCmd, this.shell.settings.ganacheArgs);
-        this.proc.on('error', function(err) {
+        this.proc.on('error', function (err) {
             console.error(`
  🧨 Unable to launch blockchain serivce: ➜ ℹ️  ${err}
 
@@ -236,7 +236,7 @@ class ExternalProcessBlockchain extends AbsBlockchainBase {
 
     stopService() {
         this.log("💀  ganache-mgr: stopping temp. ganache instance");
-        if(this.proc) {
+        if (this.proc) {
             this.proc.kill('SIGINT');
             this.proc = undefined;
         }

diff --git a/src/compiler/remoteCompiler.js b/src/compiler/remoteCompiler.js
@@ -5,23 +5,24 @@
  * */
 /** IMPORT */
 const { solcVersions } = require('./autogenerated/solcVersions.js')
+const { generateSolidity } = require('abi-to-sol')
 const request = require('request');
 
 function normalizeSolcVersion(version) {
     return version.replace('soljson-', '').replace('.js', '');
 }
 
-function getSolcJsCompilerList(options){
+function getSolcJsCompilerList(options) {
     options = options || {};
     return new Promise((resolve, reject) => {
         request.get('https://solc-bin.ethereum.org/bin/list.json', (err, res, body) => {
-            if(err){
+            if (err) {
                 return reject(err)
-            }else{
+            } else {
                 let data = JSON.parse(body);
                 let releases = Object.values(data.releases)
 
-                if(options.nightly){
+                if (options.nightly) {
                     releases = Array.from(new Set([...releases, ...data.builds.map(b => b.path)]));
                 }
                 return resolve(releases.map(normalizeSolcVersion))
@@ -38,7 +39,7 @@ function getRemoteCompiler(solidityVersion) {
             (e) => !e.includes('nightly') && e.includes(`v${solidityVersion}`)
         )
 
-        if (remoteSolidityVersion) { 
+        if (remoteSolidityVersion) {
             return resolve(remoteSolidityVersion);
         }
         //download remote compiler list and check again.
@@ -55,10 +56,32 @@ function getRemoteCompiler(solidityVersion) {
     });
 }
 
+//.import interface 0x40cfee8d71d67108db46f772b7e2cd55813bf2fb test2
+function getRemoteInterfaceFromEtherscan(address, name, chain) {
+    return new Promise((resolve, reject) => {
 
+        let provider = `https://api${(!chain || chain == "mainnet") ? "" : `-${chain}`}.etherscan.io`
+        let url = `${provider}/api?module=contract&action=getabi&address=${address}`;
+        request.get(url, (err, res, body) => {
+            if (err) {
+                return reject(err)
+            } else {
+                let data = JSON.parse(body);
+                if (!data.status || data.status != "1" || !data.result) {
+                    return reject(data)
+                }
+                let abi = JSON.parse(data.result);
+                let src = generateSolidity({ name: name, solidityVersion: "0.8.9", abi });
+                src = src.substring(src.indexOf("\n\n") + 2, src.indexOf("// THIS FILE WAS AUTOGENERATED FROM"));
+                return resolve(src)
+            }
+        })
+    });
+}
 
 module.exports = {
     getRemoteCompiler,
-    getSolcJsCompilerList
+    getSolcJsCompilerList,
+    getRemoteInterfaceFromEtherscan
 }
 
diff --git a/src/compiler/utils.js b/src/compiler/utils.js
@@ -8,10 +8,10 @@ const fs = require('fs');
 
 function readFileCallback(sourcePath, options) {
     options = options || {};
-    if(sourcePath.startsWith("https://") && options.allowHttp){
+    if (sourcePath.startsWith("https://") && options.allowHttp) {
         //allow https! imports; not yet implemented
         const res = require('sync-request')('GET', sourcePath); //@todo: this is super buggy and might freeze the app. needs async/promises.
-        return { contents: res.getBody('utf8')};
+        return { contents: res.getBody('utf8') };
     }
     else {
         const prefixes = [options.basePath ? options.basePath : ""].concat(
@@ -31,6 +31,8 @@ function readFileCallback(sourcePath, options) {
     return { error: 'File not found inside the base path or any of the include paths.' }
 }
 
+
+
 module.exports = {
     readFileCallback
 }
diff --git a/src/handler.js b/src/handler.js
@@ -5,11 +5,10 @@
  * */
 /** IMPORT */
 const path = require('path');
-const Web3 = require('web3');
 const solc = require('solc');
 const { getRemoteCompiler } = require('./compiler/remoteCompiler.js');
 const { readFileCallback } = require('./compiler/utils.js');
-const { ExternalProcessBlockchain, ExternalUrlBlockchain ,BuiltinGanacheBlockchain } = require('./blockchain.js');
+const { ExternalProcessBlockchain, ExternalUrlBlockchain, BuiltinGanacheBlockchain } = require('./blockchain.js');
 
 
 /** CONST */
@@ -153,13 +152,13 @@ class InteractiveSolidityShell {
     }
 
     initBlockchain() {
-        if(this.blockchain){
+        if (this.blockchain) {
             this.blockchain.stopService();
         }
 
-        if(!this.settings.blockchainProvider || this.settings.blockchainProvider === "internal"){
+        if (!this.settings.blockchainProvider || this.settings.blockchainProvider === "internal") {
             this.blockchain = new BuiltinGanacheBlockchain(this);
-        } else if(this.settings.blockchainProvider.startsWith("https://") || this.settings.blockchainProvider.startsWith("http://")) {
+        } else if (this.settings.blockchainProvider.startsWith("https://") || this.settings.blockchainProvider.startsWith("http://")) {
             this.blockchain = new ExternalUrlBlockchain(this, this.settings.blockchainProvider);
         } else if (this.settings.blockchainProvider.length > 0) {
             this.settings.ganacheCmd = this.settings.blockchainProvider;
@@ -306,12 +305,12 @@ contract ${this.settings.templateContractName} {
                 const callbacks = {
                     'import': (sourcePath) => readFileCallback(
                         sourcePath, {
-                            basePath: process.cwd(), 
-                            includePath: [
-                                path.join(process.cwd(), "node_modules")
-                            ],
-                            allowHttp: this.settings.resolveHttpImports
-                        }
+                        basePath: process.cwd(),
+                        includePath: [
+                            path.join(process.cwd(), "node_modules")
+                        ],
+                        allowHttp: this.settings.resolveHttpImports
+                    }
                     )
                 };
 
@@ -368,7 +367,7 @@ contract ${this.settings.templateContractName} {
                 }
                 let retType = ""
                 let matches = lastTypeError.message.match(rexTypeErrorReturnArgumentX);
-                if(matches){
+                if (matches) {
                     //console.log("2nd pass - detect return type")
                     retType = matches[1].trim();
                     if (retType.startsWith('int_const -')) {
@@ -381,28 +380,28 @@ contract ${this.settings.templateContractName} {
                         let fragments = retType.split(' '); //address[] storage pointer
                         fragments.pop() // pop 'pointer'
                         console.log(fragments)
-                        if (fragments[1] == "storage"){
+                        if (fragments[1] == "storage") {
                             fragments[1] = "memory";
                         }
                         retType = fragments.join(' ');
                     }
-                } else if(lastTypeError.message.includes(TYPE_ERROR_DETECT_RETURNS)) {
+                } else if (lastTypeError.message.includes(TYPE_ERROR_DETECT_RETURNS)) {
                     console.error("WARNING: cannot auto-resolve type for complex function yet ://\n     If this is a function call, try unpacking the function return values into local variables explicitly!\n     e.g. `(uint a, address b, address c) = myContract.doSomething(1,2,3);`")
                     // lets give it a low-effort try to resolve return types. this will not always work.
                     let rexFunctionName = new RegExp(`([a-zA-Z0-9_\\.]+)\\s*\\(.*?\\)`);
                     let matchedFunctionNames = statement.rawCommand.match(rexFunctionName);
-                    if(matchedFunctionNames.length >= 1 ){
+                    if (matchedFunctionNames.length >= 1) {
                         let funcNameParts = matchedFunctionNames[1].split(".");
-                        let funcName = funcNameParts[funcNameParts.length-1]; //get last
+                        let funcName = funcNameParts[funcNameParts.length - 1]; //get last
                         let rexReturns = new RegExp(`function ${funcName}\\s*\\(.* returns\\s*\\(([^\\)]+)\\)`)
-                        
+
                         let returnDecl = sourceCode.match(rexReturns);
-                        if(returnDecl.length >1){
+                        if (returnDecl.length > 1) {
                             retType = returnDecl[1];
                         }
                     }
 
-                    if(retType === ""){
+                    if (retType === "") {
                         this.revert();
                         return reject(errors);
                     }
@@ -411,7 +410,7 @@ contract ${this.settings.templateContractName} {
                     this.revert();
                     return reject(errors);
                 }
-                
+
                 this.session.statements[this.session.statements.length - 1].returnType = retType;
 
                 //try again!

diff --git a/src/index.js b/src/index.js
@@ -3,7 +3,7 @@
  * @author github.com/tintinweb
  * @license MIT
  * */
-const {InteractiveSolidityShell} = require('./handler');
+const { InteractiveSolidityShell } = require('./handler');
 
 module.exports = {
     InteractiveSolidityShell