error-message: Add custom error messages

1 files changed, 46 insertions, 2 deletions

diff --git a/lib/utils/error-message.js b/lib/utils/error-message.js
index 49aa9124e..028a18bbb 100644
--- a/lib/utils/error-message.js
+++ b/lib/utils/error-message.js
@@ -66,8 +66,52 @@ function errorMessage (er) {
       ])
       break
 
-    // TODO(isaacs)
-    // Add a special case here for E401 and E403 explaining auth issues?
+    case 'EOTP':
+      short.push(['', 'This operation requires a one-time password from your authenticator.'])
+      detail.push([
+        '',
+        [
+          'You can provide a one-time password by passing --otp=<code> to the command you ran.',
+          'If you already provided a one-time password then it is likely that you either typoed',
+          'it, or it timed out. Please try again.'
+        ].join('\n')
+      ])
+      break
+
+    case 'E401':
+      // npm ERR! code E401
+      // npm ERR! Unable to authenticate, need: Basic
+      if (er.headers && er.headers['www-authenticate']) {
+        const auth = er.headers['www-authenticate']
+        if (auth.indexOf('Bearer') !== -1) {
+          short.push(['', 'Unable to authenticate, your authentication token seems to be invalid.'])
+          detail.push([
+            '',
+            [
+              'To correct this please trying logging in again with:',
+              '    npm login'
+            ].join('\n')
+          ])
+          break
+        } else if (auth.indexOf('Basic') !== -1) {
+          short.push(['', 'Incorrect or missing password.'])
+          detail.push([
+            '',
+            [
+              'If you were trying to login, change your password, create an',
+              'authentication token or enable two-factor authentication then',
+              'that means you likely typed your password in incorectly.',
+              'Please try again, or recover your password at:',
+              '    https://www.npmjs.com/forgot',
+              '',
+              'If you were doing some other operation then your saved credentials are',
+              'probably out of date. To correct this please try logging in again with:',
+              '    npm login'
+            ].join('\n')
+          ])
+          break
+        }
+      }
 
     case 'E404':
       // There's no need to have 404 in the message as well.