fix: update permitted GitHub token characters

Our commit linter is flagging the GitHub blog URL for being longer than
100 characters so here it is as a tinyurl.

Refs: https://tinyurl.com/2p9cz8m3
Fixes: #617

lib/auth.js

@@ -28,8 +28,8 @@ function check(username, token) {
   if (typeof token !== 'string') {
     errorExit(`token must be a string, received ${typeof token}`);
   }
-  if (!/^[0-9a-f]+$/.test(token)) {
-    errorExit(`token must be lowercase hexadecimal, received ${token}`);
+  if (!/^[A-Za-z0-9_]+$/.test(token)) {
+    errorExit(`token is misformatted: ${token}`);
   }
 }
 

test/unit/auth.test.js

@@ -102,9 +102,25 @@ describe('auth', async function() {
   it('does not accept an invalid token format', async function() {
     this.timeout(2000);
     await runAuthScript(
-      { HOME: { username: 'nyancat', token: '0123456789ABCDEF' } },
+      { HOME: { username: 'nyancat', token: '@fhqwhgads' } },
       [],
-      'token must be lowercase hexadecimal, received 0123456789ABCDEF\n'
+      'token is misformatted: @fhqwhgads\n'
+    );
+  });
+
+  it('permits capital letters in token format', async function() {
+    this.timeout(2000);
+    await runAuthScript(
+      { HOME: { username: 'nyancat', token: '0123456789ABCDEF' } },
+      ['{"github":"bnlhbmNhdDowMTIzNDU2Nzg5QUJDREVG"}']
+    );
+  });
+
+  it('permits underscores in token format', async function() {
+    this.timeout(2000);
+    await runAuthScript(
+      { HOME: { username: 'nyancat', token: 'ghp_0123456789ABCDEF' } },
+      ['{"github":"bnlhbmNhdDpnaHBfMDEyMzQ1Njc4OUFCQ0RFRg=="}']
     );
   });
 });