Don't evict username/password when handling "stale" digest authentication challenges.

Stale challenges indicate that the cached nonce (and associated nonce_count) are no longer valid.

BUG=53353
TEST=Use a digest authentication Squid proxy with default settings (which complain about stale nonce's). Ensure that there are no username/password prompts after getting a stale challenge. Also, net_unittests. 

Review URL: http://codereview.chromium.org/3421005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@59643 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 17 insertions, 0 deletions

diff --git a/net/http/http_auth_cache.cc b/net/http/http_auth_cache.cc
index 5b1a275..7423115 100644
--- a/net/http/http_auth_cache.cc
+++ b/net/http/http_auth_cache.cc
@@ -166,6 +166,12 @@ bool HttpAuthCache::Entry::HasEnclosingPath(const std::string& dir) {
   return false;
 }
 
+void HttpAuthCache::Entry::UpdateStaleChallenge(
+    const std::string& auth_challenge) {
+  auth_challenge_ = auth_challenge;
+  nonce_count_ = 1;
+}
+
 bool HttpAuthCache::Remove(const GURL& origin,
                            const std::string& realm,
                            const std::string& scheme,
@@ -184,4 +190,15 @@ bool HttpAuthCache::Remove(const GURL& origin,
   return false;
 }
 
+bool HttpAuthCache::UpdateStaleChallenge(const GURL& origin,
+                                         const std::string& realm,
+                                         const std::string& scheme,
+                                         const std::string& auth_challenge) {
+  HttpAuthCache::Entry* entry = Lookup(origin, realm, scheme);
+  if (!entry)
+    return false;
+  entry->UpdateStaleChallenge(auth_challenge);
+  return true;
+}
+
 }  // namespace net