Add support for fetching contracts from blockscout instances

libs/remix-core-plugin/src/index.ts

@@ -8,3 +8,4 @@ export * from './types/contract'
 export { LinkLibraries, DeployLibraries } from './lib/link-libraries'
 export { OpenZeppelinProxy } from './lib/openzeppelin-proxy'
 export { fetchContractFromEtherscan } from './lib/helpers/fetch-etherscan'
+export { fetchContractFromBlockscout } from './lib/helpers/fetch-blockscout'

libs/remix-core-plugin/src/lib/helpers/fetch-blockscout.ts

@@ -0,0 +1,77 @@
+export const fetchContractFromBlockscout = async (plugin, endpoint, contractAddress, targetPath, shouldSetFile = true) => {
+  let data
+  const compilationTargets = {}
+
+  try {
+    data = await fetch('https://' + endpoint + '/api?module=contract&action=getsourcecode&address=' + contractAddress)
+    data = await data.json()
+    console.log(data)
+    // blockscout api doc https://blockscout.com/poa/core/api-docs
+    if (data.message === 'OK' && data.status === "1") {
+      if (data.result.length) {
+        if (!data.result[0].SourceCode || data.result[0].SourceCode === '') {
+          throw new Error(`contract not verified on Blockscout ${endpoint} network`)
+        }
+        // if (data.result[0].AdditionalSources
+        //   && Array.isArray(data.result[0].AdditionalSources)
+        //   && data.result[0].AdditionalSources.length > 0) {
+        //     let sourceCode = {
+        //       data.result[0].FileName
+        //     }
+        //   }
+        // if (data.result[0].SourceCode.startsWith('{')) {
+        //   data.result[0].SourceCode = JSON.parse(data.result[0].SourceCode.replace(/(?:\r\n|\r|\n)/g, '').replace(/^{{/, '{').replace(/}}$/, '}'))
+        // }
+      }
+    } else throw new Error('unable to retrieve contract data ' + data.message)
+  } catch (e) {
+    throw new Error('unable to retrieve contract data: ' + e.message)
+  }
+
+  if (!data || !data.result) {
+    return null
+  }
+
+  if (data.result[0].FileName === '') {
+    const fileName = `${targetPath}/${data.result[0].ContractName}.sol`
+    if (shouldSetFile) await plugin.call('fileManager', 'setFile', fileName, data.result[0].SourceCode)
+    compilationTargets[fileName] = { content: data.result[0].SourceCode }
+  } else {
+    const sources = {}
+    sources[data.result[0].FileName] = data.result[0].SourceCode
+    if (data.result[0].AdditionalSources && Array.isArray(data.result[0].AdditionalSources)) {
+      for (const object of data.result[0].AdditionalSources) {
+        sources[object.Filename] = object.SourceCode
+      }
+    }
+
+    for (let [file, source] of Object.entries(sources)) {
+      file = file.replace('browser/', '') // should be fixed in the remix IDE end.
+      file = file.replace(/^\//g, '') // remove first slash.
+      if (await plugin.call('contentImport', 'isExternalUrl', file)) {
+        // nothing to do, the compiler callback will handle those
+      } else {
+        const path = `${targetPath}/${file}`
+        const content = source
+        if (shouldSetFile) await plugin.call('fileManager', 'setFile', path, content)
+        compilationTargets[path] = { content }
+      }
+    }
+  }
+
+  let runs = 0
+  try {
+    runs = parseInt(data.result[0].OptimizationRuns)
+  } catch (e) { }
+  const settings = {
+    version: data.result[0].CompilerVersion.replace(/^v/, ''),
+    language: 'Solidity',
+    evmVersion: data.result[0].EVMVersion.toLowerCase(),
+    optimize: data.result[0].OptimizationUsed === 'true',
+    runs
+  }
+  return {
+    settings,
+    compilationTargets
+  }
+}

libs/remix-ui/workspace/src/lib/actions/index.ts

@@ -6,7 +6,7 @@ import { displayNotification, displayPopUp, fetchDirectoryError, fetchDirectoryR
 import { listenOnPluginEvents, listenOnProviderEvents } from './events'
 import { createWorkspaceTemplate, getWorkspaces, loadWorkspacePreset, setPlugin, workspaceExists } from './workspace'
 import { QueryParams, Registry } from '@remix-project/remix-lib'
-import { fetchContractFromEtherscan } from '@remix-project/core-plugin' // eslint-disable-line
+import { fetchContractFromEtherscan, fetchContractFromBlockscout } from '@remix-project/core-plugin' // eslint-disable-line
 import JSZip from 'jszip'
 import { Actions, FileTree } from '../types'
 import IpfsHttpClient from 'ipfs-http-client'
@@ -26,6 +26,7 @@ export type UrlParametersType = {
   url: string,
   address: string
   opendir: string,
+  blockscout: string,
 }
 
 const basicWorkspaceInit = async (workspaces: { name: string; isGitRepo: boolean; }[], workspaceProvider) => {
@@ -82,6 +83,36 @@ export const initWorkspace = (filePanelPlugin) => async (reducerDispatch: React.
       plugin.setWorkspace({name: 'code-sample', isLocalhost: false})
       dispatch(setCurrentWorkspace({name: 'code-sample', isGitRepo: false}))
       const filePath = await loadWorkspacePreset('code-template')
+      plugin.on('filePanel', 'workspaceInitializationCompleted', async () => {
+        if (editorMounted) {
+          setTimeout(async () => {
+            await plugin.fileManager.openFile(filePath)
+          }, 1000)
+        } else {
+          filePathToOpen = filePath
+        }
+      })
+    } else if (params.address && params.blockscout) {
+      if (params.address.startsWith('0x') && params.address.length === 42 && params.blockscout.length > 0) {
+        const contractAddress = params.address
+        const blockscoutUrl = params.blockscout
+        plugin.call('notification', 'toast', `Looking for contract(s) verified on ${blockscoutUrl} for contract address ${contractAddress} .....`)
+        let data
+        let count = 0
+        try {
+          const workspaceName = 'code-sample'
+          let filePath
+          const target = `/${blockscoutUrl}/${contractAddress}`
+
+          data = await fetchContractFromBlockscout(plugin, blockscoutUrl, contractAddress, target, false)
+          if (await workspaceExists(workspaceName)) workspaceProvider.setWorkspace(workspaceName)
+          else await createWorkspaceTemplate(workspaceName, 'code-template')
+          plugin.setWorkspace({ name: workspaceName, isLocalhost: false })
+          dispatch(setCurrentWorkspace({ name: workspaceName, isGitRepo: false }))
+          count = count + (Object.keys(data.compilationTargets)).length
+          for (filePath in data.compilationTargets)
+            await workspaceProvider.set(filePath, data.compilationTargets[filePath]['content'])
+
           plugin.on('filePanel', 'workspaceInitializationCompleted', async () => {
             if (editorMounted){
               setTimeout(async () => {
@@ -90,6 +121,11 @@ export const initWorkspace = (filePanelPlugin) => async (reducerDispatch: React.
               filePathToOpen = filePath
             }
           })
+          plugin.call('notification', 'toast', `Added ${count} verified contract${count === 1 ? '' : 's'} from ${blockscoutUrl} network for contract address ${contractAddress} !!`)
+        } catch (error) {
+          await basicWorkspaceInit(workspaces, workspaceProvider)
+        }
+      } else await basicWorkspaceInit(workspaces, workspaceProvider)
     } else if (params.address) {
       if (params.address.startsWith('0x') && params.address.length === 42) {
         const contractAddress = params.address