/// <summary>
/// This method grants authorization for repository level (non-resource-specific) predicates, e.g. Create.
/// </summary>
/// <param name="authorizingPredicateUri">Uri for a non-resource specific predicate, e.g. Create</param>
/// <param name="context">ZentityContext object</param>
/// <returns>True if the current identity instance has authorization for the given predicate, false otherwise.</returns>
public bool GrantAuthorization(string authorizingPredicateUri, ZentityContext context)
{
#region Parameter Validation
ValidateParameters(authorizingPredicateUri, context);
#endregion
try
{
Relationship existingRelationship = context.Relationships.Where(rel =>
rel.Subject.Id == this.Id &&
rel.Object.Id == this.Id &&
rel.Predicate.Uri.Equals(authorizingPredicateUri, StringComparison.OrdinalIgnoreCase)).FirstOrDefault();
if (existingRelationship == null)
{
// Check if relationship is present in context in added state
foreach (ObjectStateEntry objectStateEntry in
context.ObjectStateManager.GetObjectStateEntries(EntityState.Added))
{
existingRelationship = objectStateEntry.Entity as Relationship;
//// Check if relationship is same on which Grant is requested
if (existingRelationship != null &&
(existingRelationship.Subject.Id == this.Id &&
existingRelationship.Object.Id == this.Id &&
existingRelationship.Predicate.Uri.Equals(authorizingPredicateUri, StringComparison.OrdinalIgnoreCase)))
{
return(true);
}
}
Relationship relationship = new Relationship();
relationship.Subject = this;
relationship.Object = this;
relationship.Predicate = context.Predicates.Where(s => s.Uri == authorizingPredicateUri).First <Predicate>();
context.AddToRelationships(relationship);
}
else
{
// Check if relationship is present in context in added, modified or deleted state
foreach (ObjectStateEntry objectStateEntry in
context.ObjectStateManager.GetObjectStateEntries(EntityState.Deleted
| EntityState.Modified))
{
Relationship relationshipEntity = objectStateEntry.Entity as Relationship;
if (relationshipEntity != null &&
relationshipEntity.Id == existingRelationship.Id)
{
//// If its in deleted state, make it in unchanged
if (objectStateEntry.State == EntityState.Deleted)
{
objectStateEntry.AcceptChanges();
}
else
{
//// If modified, then add a new relationship
Relationship relationship = new Relationship();
relationship.Subject = this;
relationship.Object = this;
relationship.Predicate = context.Predicates.Where(s => s.Uri == authorizingPredicateUri).First <Predicate>();
context.AddToRelationships(relationship);
}
break;
}
}
}
return(true);
}
catch (Exception exception)
{
throw new AuthorizationException(Resources.GrantAuthorizationException, exception);
}
}