/// <summary>
/// Factory constructor.
/// </summary>
public MailFilterAgentFactory()
{
// Initialize fields, parameters, and data structures.
hashManager = new SHA256Managed();
// Get the path to where the data files should be.
// The final result is calculated in relation to the
// binary DLL that contains this class and can easily
// be set to almost any directory. The only requirement
// is that the "Network Service" user has write permission
// to whatever directory is specified.
Assembly currAssembly = Assembly.GetAssembly(this.GetType());
string assemblyPath = Path.GetDirectoryName(currAssembly.Location);
this.dataPath = Path.Combine(assemblyPath, RelativeDataPath);
// Read the XML configuration file and apply its settings.
this.MailFilterSettings = new MailFilterSettings(Path.Combine(this.dataPath, ConfigFileName));
// Initialize the empty database tables.
this.verifiedDB = new MailFilterDatabase(
this.MailFilterSettings.MaxVerifiedEntries,
this.MailFilterSettings.BucketSize);
this.unverifiedDB = new MailFilterDatabase(
this.MailFilterSettings.MaxUnverifiedEntries,
this.MailFilterSettings.BucketSize);
// Try loading the contents of a persisted data file into
// the temporarily blocked sender list tables.
this.verifiedDB.ReadPersistedData(Path.Combine(this.dataPath, VerifiedDataFile));
this.unverifiedDB.ReadPersistedData(Path.Combine(this.dataPath, UnverifiedDataFile));
}
/// <summary>
/// The Copy constructor makes a copy of another settings object.
/// </summary>
/// <param name="other">The settings object to be copied.</param>
public MailFilterSettings(MailFilterSettings other)
{
this.VerifiedExpirationTime = other.VerifiedExpirationTime;
this.UnverifiedExpirationTime = other.UnverifiedExpirationTime;
this.InitialBlockingPeriod = other.InitialBlockingPeriod;
this.MaxVerifiedEntries = other.MaxVerifiedEntries;
this.MaxUnverifiedEntries = other.MaxUnverifiedEntries;
this.BucketSize = other.BucketSize;
this.CleanRowCount = other.CleanRowCount;
}
/// <summary>
/// The constructor registers all event handlers and creates
/// local references to the session database tables. It should only be called
/// from the MailFilterAgentFactory class.
/// </summary>
/// <param name="settings">A reference to a settings object.</param>
/// <param name="verifiedDatabase">A reference to the table of verified entries.</param>
/// <param name="unverifiedDatabase">A reference to the table of unverified entries.</param>
/// <param name="hashManager">A reference to the hash class instance in the factory.</param>
/// <param name="server">A reference to the SMTP server, passed from the factory.</param>
public MailFilterAgent(
MailFilterSettings settings,
MailFilterDatabase verifiedDatabase,
MailFilterDatabase unverifiedDatabase,
SHA256Managed hashManager,
SmtpServer server)
{
// Initialize instance variables.
this.settings = settings;
this.server = server;
this.verifiedDatabase = verifiedDatabase;
this.unverifiedDatabase = unverifiedDatabase;
this.testOnEndOfHeaders = false;
this.hashManager = hashManager;
// Set up the hooks to have your functions called when certain events occur.
this.OnRcptCommand += new RcptCommandEventHandler(this.OnRcptCommandHandler);
this.OnEndOfHeaders += new EndOfHeadersEventHandler(this.OnEndOfHeaderHandler);
}