private static void InvalidateUserCredentials(string username)
{
if (CredentialCache.ContainsKey(username))
{
CredentialCache.Remove(username);
}
DeleteDatabaseCredentials(ProtectUsername(username));
}
/// <summary>
/// Create new account, using Person entity, password, and optionally privilegies level.
/// </summary>
/// <param name="person"></param>
/// <param name="password"></param>
/// <param name="privilegies"></param>
public static void CreateAccount(Person person, string password, char privilegies = 'c')
{
using (var tx = Client.GetTransactions().TxStart())
{
// Referential integrity check
if (CredentialCache.ContainsKey(person.Phone))
{
tx.Commit();
throw new ReferentialException("Can not create new account.")
{
ReadableMessage = $"Can not create account because account with phone {person.Phone} already exists."
};
}
if (!LocationCache.ContainsKey(person.LocationID))
{
tx.Commit();
throw new ReferentialException("Can not create new account.")
{
ReadableMessage = $"Can not create account because location with key {person.LocationID} does not exist."
};
}
// Normal operation
int key = LastUsedKeys.Get("person");
PersonCache.Put(key, person);
LastUsedKeys.Put("person", key + 1);
Credential c = new Credential
{
Password = password,
Privilegies = (byte)privilegies,
Status = (byte)'n',
PersonID = key
};
CredentialCache.Put(person.Phone, c);
tx.Commit();
}
}
/// <summary>
/// Put a person into the cache.<br/>
/// This method checks referential integrity on field Person.LocationID: <br/>
/// Location with _key = Person.LocationID has to exist. <br/>
/// Otherwise, method throws ReferentialException. <br/>
/// This and other put methods DO NOT validate the entity.
/// </summary>
/// <param name="p">Person to put into the cache.</param>
public static void PutPerson (Person p)
{
using (var tx = Client.GetTransactions().TxStart())
{
// Check if Location cache contains Location with key p.LocationID, throw error if not.
if (!(LocationCache.ContainsKey(p.LocationID)))
{
tx.Commit();
throw new ReferentialException ("Can not put new entry into Person cache.")
{
Operation = "put",
TableName = "Person",
FieldName = "LocationID",
ReadableMessage = $"Can not put new entry into Person cache because Location with key {p.LocationID} does not exist."
};
}
// Check if Credential cache contains Credential with key p.Phone, throw error if yes.
if (CredentialCache.ContainsKey(p.Phone))
{
tx.Commit();
throw new ReferentialException ("Can not put new entry into Person cache.")
{
Operation = "put",
TableName = "Person",
FieldName = "Phone",
ReadableMessage = $"Can not put new entry into Person cache because Person with Phone '{p.Phone}' and Credential with the same key already exist."
};
}
// Normal operation.
int key = LastUsedKeys.Get("person");
PersonCache.Put(key, p);
key++;
LastUsedKeys.Put ("person", key);
tx.Commit();
}
}
public static SecureString GetUserCredential(string username)
{
if (CredentialCache.ContainsKey(username))
{
return(CredentialCache[username]);
}
string obusername = ProtectUsername(username);
byte[] enccred = GetDatabaseCredentials(obusername);
if (enccred != null)
{
try
{
byte[] cred = ProtectedData.Unprotect(enccred, null, DataProtectionScope.LocalMachine);
if (cred != null)
{
SecureString secstr = new SecureString();
foreach (byte c in cred)
{
secstr.AppendChar((char)c);
}
secstr.MakeReadOnly();
return(secstr);
}
}
catch (CryptographicException)
{
InvalidateUserCredentials(username);
}
}
return(null);
}
