fix: gracefully exit login and publish commands on Ctrl+C (SIGINT) in…

… the new webAuthn flow (#5243)

lib/utils/open-url-prompt.js

@@ -34,6 +34,11 @@ const promptOpen = async (npm, url, title, prompt, emitter) => {
   })
 
   const tryOpen = await new Promise(resolve => {
+    rl.on('SIGINT', () => {
+      rl.close()
+      resolve('SIGINT')
+    })
+
     rl.question(prompt, () => {
       resolve(true)
     })
@@ -50,6 +55,10 @@ const promptOpen = async (npm, url, title, prompt, emitter) => {
     }
   })
 
+  if (tryOpen === 'SIGINT') {
+    throw new Error('canceled')
+  }
+
   if (!tryOpen) {
     return
   }

test/lib/utils/open-url-prompt.js

@@ -28,6 +28,8 @@ const opener = (url, opts, cb) => {
 }
 
 let questionShouldResolve = true
+let openUrlPromptInterrupted = false
+
 const readline = {
   createInterface: () => ({
     question: (_q, cb) => {
@@ -36,6 +38,11 @@ const readline = {
       }
     },
     close: () => {},
+    on: (_signal, cb) => {
+      if (openUrlPromptInterrupted && _signal === 'SIGINT') {
+        cb()
+      }
+    },
   }),
 }
 
@@ -148,3 +155,25 @@ t.test('returns error when opener errors', async t => {
   )
   t.equal(openerUrl, 'https://www.npmjs.com', 'did not open')
 })
+
+t.test('throws "canceled" error on SIGINT', async t => {
+  t.teardown(() => {
+    openerUrl = null
+    openerOpts = null
+    OUTPUT.length = 0
+    questionShouldResolve = true
+    openUrlPromptInterrupted = false
+  })
+
+  questionShouldResolve = false
+  openUrlPromptInterrupted = true
+  const emitter = new EventEmitter()
+
+  const open = openUrlPrompt(npm, 'https://www.npmjs.com', 'npm home', 'prompt', emitter)
+
+  try {
+    await open
+  } catch (err) {
+    t.equal(err.message, 'canceled')
+  }
+})