private void LogMessage(CachingEntityAccessControlCheckerResult result)
{
// Force an indent by using two message contexts
using (MessageContext outermessageContext = new MessageContext(EntityAccessControlService.MessageName))
{
outermessageContext.Append(() => string.Format("Cache '{0}' results:", CacheName));
using (MessageContext innerMessageContext = new MessageContext(EntityAccessControlService.MessageName))
{
if (result.CacheResult.Count > 0)
{
innerMessageContext.Append(() => string.Format(
"Allowed: {0}",
string.Join(", ",
result.CacheResult.Where(kvp => kvp.Value)
.Select(kvp => kvp.Key))));
innerMessageContext.Append(() => string.Format(
"Denied: {0}",
string.Join(", ",
result.CacheResult.Where(kvp => !kvp.Value)
.Select(kvp => kvp.Key))));
}
else
{
innerMessageContext.Append(() => "No results found in the cache.");
}
}
}
}
/// <summary>
/// Re-used cache checking logic that can be used for caching eithe instances lookups or type lookups.
/// </summary>
/// <param name="entities">The entities/types to check. This cannot be null or contain null.</param>
/// <param name="permissions">The permissions or operations to check. This cannot be null or contain null.</param>
/// <param name="user">The user requesting access. This cannot be null.</param>
/// <param name="entityIdCallback">Callback used to determine how to get the ID of TEntity.</param>
/// <param name="innerCheckAccessCallback">Callback used to perform the uncached check.</param>
/// <returns>A mapping of each entity ID to whether the user has access (true) or not (false).</returns>
private IDictionary <long, bool> CachedCheckImpl <TEntity>(IList <TEntity> entities, IList <EntityRef> permissions, EntityRef user,
Func <TEntity, long> entityIdCallback,
Func <IList <TEntity>, IList <EntityRef>, EntityRef, IDictionary <long, bool> > innerCheckAccessCallback)
{
TKey cacheKey;
CachingEntityAccessControlCheckerResult result;
IList <TEntity> toCheckEntities;
long[] permissionIdArray;
IDictionary <long, bool> innerResult;
// If SecurityBypassContext is active, avoid the cache. Otherwise,
// the cache will remember the user had access to entities that
// they may not have.
if (EntityAccessControlChecker.SkipCheck(user))
{
innerResult = innerCheckAccessCallback(entities, permissions, user);
return(innerResult);
}
result = new CachingEntityAccessControlCheckerResult();
toCheckEntities = null;
permissionIdArray = permissions.Select(x => x.Id).ToArray();
// Determine uncached entities
using (CacheContext cacheContext = CacheContext.IsSet( ) ? CacheContext.GetContext( ) : null)
{
foreach (TEntity entity in entities)
{
long entityId = entityIdCallback(entity);
cacheKey = CreateKey(user.Id, entityId, permissionIdArray);
bool cacheEntry;
if (Cache.TryGetValue(cacheKey, out cacheEntry))
{
result.CacheResult[entityId] = cacheEntry;
// Add the already stored changes that should invalidate this cache
// entry to any outer or containing cache contexts.
if (cacheContext != null)
{
cacheContext.AddInvalidationsFor(_cacheInvalidator, cacheKey);
}
}
else
{
if (toCheckEntities == null)
{
toCheckEntities = new List <TEntity>();
}
toCheckEntities.Add(entity);
}
}
}
LogMessage(result);
if (toCheckEntities != null)
{
using (CacheContext cacheContext = new CacheContext( ))
{
innerResult = innerCheckAccessCallback(toCheckEntities, permissions, user);
foreach (KeyValuePair <long, bool> entry in innerResult)
{
long entityId = entry.Key;
bool accessGranted = entry.Value;
result.Add(entityId, accessGranted);
// Cache the results
cacheKey = CreateKey(user.Id, entry.Key, permissionIdArray);
Cache [cacheKey] = accessGranted;
// Add the cache context entries to the appropriate CacheInvalidator
_cacheInvalidator.AddInvalidations(cacheContext, cacheKey);
}
}
}
// Add the results from the originally cached entities
foreach (KeyValuePair <long, bool> entry in result.CacheResult)
{
result[entry.Key] = entry.Value;
}
return(result);
}