Loop with String#scan without creating substrings

Create the substrings necessary parts only, instead of cutting the
rest of the buffer.  Also removed a useless, probable typo, regexp.

1 files changed, 22 insertions, 0 deletions

diff --git a/test/webrick/test_httpauth.rb b/test/webrick/test_httpauth.rb
index 4df7141e85..9fe8af8be2 100644
--- a/test/webrick/test_httpauth.rb
+++ b/test/webrick/test_httpauth.rb
@@ -310,6 +310,28 @@ class TestWEBrickHTTPAuth < Test::Unit::TestCase
     }
   end
 
+  def test_digest_auth_invalid
+    digest_auth = WEBrick::HTTPAuth::DigestAuth.new(Realm: 'realm', UserDB: '')
+
+    def digest_auth.error(fmt, *)
+    end
+
+    def digest_auth.try_bad_request(len)
+      request = {"Authorization" => %[Digest a="#{'\b'*len}]}
+      authenticate request, nil
+    end
+
+    bad_request = WEBrick::HTTPStatus::BadRequest
+    t0 = Process.clock_gettime(Process::CLOCK_MONOTONIC)
+    assert_raise(bad_request) {digest_auth.try_bad_request(10)}
+    limit = (Process.clock_gettime(Process::CLOCK_MONOTONIC) - t0)
+    [20, 50, 100, 200].each do |len|
+      assert_raise(bad_request) do
+        Timeout.timeout(len*limit) {digest_auth.try_bad_request(len)}
+      end
+    end
+  end
+
   private
   def credentials_for_request(user, password, params, body = nil)
     cnonce = "hoge"