Made --remix-ide flag optional

bin/remixd.ts

@@ -23,17 +23,17 @@ import * as path from 'path'
   const killCallBack: Array<Function> = []
 
   if (!program.remixIde) {
-    console.log('\x1b[31m%s\x1b[0m', '[ERR] URL Remix IDE instance has to be provided.')
-  }
+    console.log('\x1b[33m%s\x1b[0m', '[WARN] You can only connect to remixd from one of the supported origins.')
+  } else {
     const isValid = await isValidOrigin(program.remixIde)
-
-  /* Allow unsupported domains for users running remixd without fetched origin.json file. */
+    /* Allow unsupported origins and display warning. */
     if (!isValid) {
       console.log('\x1b[33m%s\x1b[0m', '[WARN] You are using IDE from an unsupported origin.')
       console.log('\x1b[33m%s\x1b[0m', 'Check https://gist.github.com/EthereumRemix/091ccc57986452bbb33f57abfb13d173 for list of all supported origins.\n')
       // return
     }
     console.log('\x1b[33m%s\x1b[0m', '[WARN] You may now only use IDE at ' + program.remixIde + ' to connect to that instance')
+  }
 
   if (program.sharedFolder) {
     console.log('\x1b[33m%s\x1b[0m', '[WARN] Any application that runs on your computer can potentially read from and write to all files in the directory.')

src/websocket.ts

@@ -53,5 +53,24 @@ export default class WebSocket {
 }
 
 function originIsAllowed (origin: string, self: WebSocket): boolean {
+  if (self.opt.remixIdeUrl) {
+    if (self.opt.remixIdeUrl.endsWith('/')) self.opt.remixIdeUrl = self.opt.remixIdeUrl.slice(0, -1)
     return origin === self.opt.remixIdeUrl || origin === getDomain(self.opt.remixIdeUrl)
+  } else {
+    try {
+      const origins = require('../bin/origins.json')
+      const domain = getDomain(origin)
+      const { data } = origins
+      
+      if (data.includes(origin) || data.includes(domain)) {
+        self.opt.remixIdeUrl = origin
+        console.log('\x1b[33m%s\x1b[0m', '[WARN] You may now only use IDE at ' + self.opt.remixIdeUrl + ' to connect to that instance')
+        return true
+      } else {
+        return false
+      }
+    } catch (e) {
+      return false
+    }
+  }
 }