ucb: webdav-curl: tdf#101094 (29) Fix for IIS 10.0 disabled OPTIONS method

When OPTIONS methods (or verb) is disabled (or denied) on a IIS 10.0
web server, error 404 (e.g. 'Not Found') is emitted, so we need to deal
with it.

[ port of commit e0d0d87257d62ac61377a73909e17753f96e7aaa ]

Change-Id: I67309f1bce20bba1399a9a3c22568291d095ac69
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/123484
Tested-by: Michael Stahl <michael.stahl@allotropia.de>
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>

2 files changed, 36 insertions, 1 deletions

diff --git a/ucb/source/ucp/webdav-curl/webdavcontent.cxx b/ucb/source/ucp/webdav-curl/webdavcontent.cxx
index 237c51851af0..b96a58b3fb83 100644
--- a/ucb/source/ucp/webdav-curl/webdavcontent.cxx
+++ b/ucb/source/ucp/webdav-curl/webdavcontent.cxx
@@ -3965,8 +3965,17 @@ void Content::getResourceOptions(
                         break;
                         case SC_NOT_FOUND:
                         {
+                            // Apparently on IIS 10.0, if you disabled OPTIONS method, this error is the one reported,
+                            // instead of SC_NOT_IMPLEMENTED or SC_METHOD_NOT_ALLOWED.
+                            // So check if this is an available resource, or a real 'Not Found' event.
+                            sal_uInt32 nLifeTime = m_nOptsCacheLifeNotFound;
+                            if( isResourceAvailable(xEnv, rResAccess ) )
+                            {
+                                nLifeTime = m_nOptsCacheLifeNotImpl;
+                                rDAVOptions.setResourceFound(); // means it exists, but it's not DAV
+                            }
                             aStaticDAVOptionsCache.addDAVOptions( rDAVOptions,
-                                                                  m_nOptsCacheLifeNotFound );
+                                                                  nLifeTime );
                             SAL_WARN( "ucb.ucp.webdav", "OPTIONS - Resource not found for URL <" << m_xIdentifier->getContentIdentifier() << ">" );
                         }
                         break;
@@ -4015,4 +4024,27 @@ void Content::getResourceOptions(
 }
 
 
+//static
+bool Content::isResourceAvailable( const css::uno::Reference< css::ucb::XCommandEnvironment >& xEnv,
+                                  const std::unique_ptr< DAVResourceAccess > & rResAccess )
+{
+    try
+    {
+        // To check for the physical URL resource availability, using a simple HEAD command
+        // if HEAD is successfull, set element found.
+        std::vector< OUString > aHeaderNames;
+        DAVResource resource;
+        rResAccess->HEAD( aHeaderNames, resource, xEnv );
+        return true;
+    }
+    catch ( ... )
+    {
+        // some error... so set as not found
+        // retry errors are taken care of
+        // in rResAccess function method.
+        return false;
+    }
+}
+
+
 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/ucb/source/ucp/webdav-curl/webdavcontent.hxx b/ucb/source/ucp/webdav-curl/webdavcontent.hxx
index f00b82634299..f854cc24047e 100644
--- a/ucb/source/ucp/webdav-curl/webdavcontent.hxx
+++ b/ucb/source/ucp/webdav-curl/webdavcontent.hxx
@@ -296,6 +296,9 @@ public:
     void getResourceOptions( const css::uno::Reference< css::ucb::XCommandEnvironment >& xEnv,
                              DAVOptions& rDAVOptions );
 
+    static bool isResourceAvailable( const css::uno::Reference< css::ucb::XCommandEnvironment >& xEnv,
+                             const std::unique_ptr< DAVResourceAccess > & rResAccess);
+
     static void removeCachedPropertyNames( const OUString & rURL );
 };