/// <summary>
/// Returns a Hashtable containing the key and filename of each file that is registered in the specified configuration
/// </summary>
/// <param name="configuration">The configuration in which the search will occur</param>
/// <returns></returns>
public static Hashtable GetRegisteredFiles(XmlConfiguration configuration)
{
ConfigurationEngine.ResetLastException();
try
{
if (configuration != null)
{
XmlConfigurationCategory category = configuration.Categories[CategoryNames.Files.ToString()];
if (category != null)
{
Hashtable table = new Hashtable();
foreach (XmlConfigurationOption option in category.Options)
{
table.Add(option.ElementName, (string)option.Value);
}
return(table);
}
}
}
catch (System.Exception systemException)
{
_lastException = systemException;
System.Diagnostics.Trace.WriteLine(systemException);
}
return(new Hashtable());
}
/// <summary>
/// Returns the filename using the specified key from the specified configuration
/// </summary>
/// <param name="configuration">The configuration from which the filename will be extracted</param>
/// <param name="key">The key by which the filename was saved</param>
/// <returns></returns>
public static string GetRegisteredFilename(XmlConfiguration configuration, string key)
{
ConfigurationEngine.ResetLastException();
try
{
if (configuration != null)
{
if (key != null && key != string.Empty)
{
XmlConfigurationCategory category = configuration.Categories[CategoryNames.Files.ToString()];
if (category != null)
{
XmlConfigurationOption option = null;
option = category.Options[key];
if (option != null)
{
return((string)option.Value);
}
}
}
}
}
catch (System.Exception systemException)
{
_lastException = systemException;
System.Diagnostics.Trace.WriteLine(systemException);
}
return(string.Empty);
}
/// <summary>
/// Registers the file using the specified key in the specified configuration. If the key already exists, the file will be written to the existing key.
/// </summary>
/// <param name="configuration">The configuration in which the file will be registered</param>
/// <param name="key">The key by which the file will be registered</param>
/// <param name="filename">The filename that will be registered</param>
/// <returns></returns>
public static bool RegisterFile(XmlConfiguration configuration, string key, string filename)
{
ConfigurationEngine.ResetLastException();
try
{
if (configuration != null)
{
if (key != null && key != string.Empty)
{
XmlConfigurationCategory category = configuration.Categories[CategoryNames.Files.ToString()];
if (category != null)
{
XmlConfigurationOption option = null;
option = category.Options[key];
if (option == null)
{
option = category.Options[key, true, filename];
option.Category = @"Registered Files";
option.Description = @"This indicates a configuration file that is registered and ready to be accessed via the ConfigurationEngine.";
}
option.Value = filename;
return(true);
}
}
}
}
catch (System.Exception systemException)
{
_lastException = systemException;
System.Diagnostics.Trace.WriteLine(systemException);
}
return(false);
}
/// <summary>
/// Reads a configuration using the specified encryption engine from the specified path
/// </summary>
/// <param name="encryptionEngine">The encryption engine to use while reading the configuration, null if no decryption is desired</param>
/// <param name="configuration">The configuration to be read into</param>
/// <param name="path">The path to be read from</param>
/// <returns></returns>
public static bool ReadConfiguration(FileEncryptionEngine encryptionEngine, out XmlConfiguration configuration, string path)
{
Stream stream = null;
ConfigurationEngine.ResetLastException();
try
{
configuration = new XmlConfiguration();
stream = (encryptionEngine != null ? encryptionEngine.CreateDecryptorStream(path) : new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.None));
XmlConfigurationReader reader = new XmlConfigurationReader();
configuration = reader.Read(stream);
configuration.Path = path;
configuration.SetHasUnpersistedChanges(false);
return(true);
}
catch (System.Exception systemException)
{
System.Diagnostics.Trace.WriteLine(systemException);
_lastException = systemException;
}
finally
{
try
{
if (stream != null)
{
stream.Close();
}
}
catch { }
}
configuration = null;
return(false);
}
/// <summary>
/// Writes a configuration using the specified encryption engine to the specified path
/// </summary>
/// <param name="encryptionEngine">The encryption engine to use while writing the configuration, null if no encryption is desired</param>
/// <param name="configuration">The confiruration to write</param>
/// <param name="path">The path to write it to</param>
/// <returns></returns>
public static bool WriteConfiguration(FileEncryptionEngine encryptionEngine, XmlConfiguration configuration, string path)
{
Stream stream = null;
ConfigurationEngine.ResetLastException();
try
{
if (configuration != null)
{
if (configuration.HasUnpersistedChanges())
{
configuration.AcceptChanges();
stream = (encryptionEngine != null ? encryptionEngine.CreateEncryptorStream(path) : new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.None));
XmlConfigurationWriter writer = new XmlConfigurationWriter();
writer.Write(configuration, stream, false);
configuration.SetHasUnpersistedChanges(false);
}
return(true);
}
}
catch (System.Exception systemException)
{
System.Diagnostics.Trace.WriteLine(systemException);
_lastException = systemException;
}
finally
{
try
{
if (stream != null)
{
stream.Close();
}
}
catch { }
}
return(false);
}
/// <summary>
/// Reads or creates an XmlConfiguration from a name, path, and/or a handler function to provide structure to a new configuration.
/// </summary>
/// <param name="name">The name that will be given to the configuration</param>
/// <param name="path">The path to the file where the configuration is stored</param>
/// <param name="configuration">The configuration that will be returned after creation or reading has finished</param>
/// <param name="encryptionEngine">The encryption engine to use when reading the file</param>
/// <param name="handler">The event handler to call if structure is needed for a new configuration</param>
/// <returns>True if a configuration was created or read</returns>
public static bool ReadOrCreateConfiguration(
bool verbose,
string name,
string path,
out XmlConfiguration configuration,
FileEncryptionEngine encryptionEngine,
XmlConfigurationEventHandler handler)
{
configuration = null;
Trace.WriteLineIf(verbose, "'Configuration Engine': Checking to see if the path '" + path + "' exists.");
/// if the file exists, we need to try and read it
if (System.IO.File.Exists(path))
{
Trace.WriteLineIf(verbose, "'Configuration Engine': The path '" + path + "' exists.");
try
{
/// but first see if we have permissions to read it
using (SecurityAccessRight right = new SecurityAccessRight(path))
{
Trace.WriteLineIf(verbose, "'Configuration Engine': Checking to see if the path '" + path + "' has read access.");
/// if we don't have rights to the file
if (!right.AssertReadAccess())
{
Trace.WriteLineIf(verbose, "'Configuration Engine': The path '" + path + "' does not have write access.");
Trace.WriteLineIf(verbose, "'Configuration Engine': Prompting for user intervention for the path '" + path + "'.");
/// prompt to see what we should do about this
DialogResult result = ExceptionEngine.DisplayException(
null,
"Read access denied - Unable to read from file",
MessageBoxIcon.Error,
MessageBoxButtons.AbortRetryIgnore,
null,
"Read access has been denied for the '" + name + "'.",
"Ignoring this exception will result in a default set of options to be loaded in the '" + name + "' for this application instance.",
"If the file has write access enabled, it will be overwritten with the loaded options when the application exits.",
"WARNING: Aborting this operation will exit the application!");
switch (result)
{
case DialogResult.Abort:
Trace.WriteLineIf(verbose, "'Configuration Engine': Aborting attempt to read from the path '" + path + "' because of user intervention.");
return(false);
case DialogResult.Retry:
Trace.WriteLineIf(verbose, "'Configuration Engine': Retrying attempt to read from the path '" + path + "' because of user intervention.");
return(ConfigurationEngine.ReadOrCreateConfiguration(verbose, name, path, out configuration, encryptionEngine, handler));
case DialogResult.Ignore:
Trace.WriteLineIf(verbose, "'Configuration Engine': Ignoring attempt to read from the path '" + path + "' because of user intervention.");
return(true);
//break;
}
;
}
else
{
Trace.WriteLineIf(verbose, "'Configuration Engine': The path '" + path + "' has read access, preparing to read the configuration.");
/// rights to read the file
/// ask the configuration engine to read our configuration file for us into our configuration
if (!ConfigurationEngine.ReadConfiguration(encryptionEngine, out configuration, path))
{
Trace.WriteLineIf(verbose, "'Configuration Engine': Failed to read the configuration, throwing last exception from the ConfigurationEngine.");
throw ConfigurationEngine.LastException;
}
/// let the configuration know where it lives
// configuration.Path = path;
/// ensure that the configuration has no changes visible
if (configuration != null)
{
Trace.WriteLineIf(verbose, "'Configuration Engine': Succeeded in reading the configuration, accepting changes .");
configuration.AcceptChanges();
}
return(true);
}
}
}
catch (System.Exception systemException)
{
Trace.WriteLineIf(verbose, "'Configuration Engine': An unexpected exception was encountered while reading the configuration, dumping exception.");
System.Diagnostics.Trace.WriteLine(systemException);
Trace.WriteLineIf(verbose, "'Configuration Engine': Prompting for user intervention for the path '" + path + "'.");
/// failed for some reason reading the file
/// prompt to see what we should do about this
DialogResult result = ExceptionEngine.DisplayException(
null,
"Exception encountered - Unable to read from file",
MessageBoxIcon.Error,
MessageBoxButtons.AbortRetryIgnore,
systemException,
"An exception was encountered while trying to read '" + name + "'.",
"Ignoring this exception will result in a default set of options to be loaded in the '" + name + "' for this application instance.",
"If the file has write access enabled, it will be overwritten with the loaded options when the application exits.",
"WARNING: Aborting this operation will exit the application!");
switch (result)
{
case DialogResult.Abort:
Trace.WriteLineIf(verbose, "'Configuration Engine': Aborting attempt to read from the path '" + path + "' because of user intervention.");
return(false);
case DialogResult.Retry:
Trace.WriteLineIf(verbose, "'Configuration Engine': Retrying attempt to read from the path '" + path + "' because of user intervention.");
return(ConfigurationEngine.ReadOrCreateConfiguration(verbose, name, path, out configuration, encryptionEngine, handler));
case DialogResult.Ignore:
Trace.WriteLineIf(verbose, "'Configuration Engine': Ignoring attempt to read from the path '" + path + "' because of user intervention.");
break;
}
;
}
}
else
{
Trace.WriteLineIf(verbose, "'Configuration Engine': The path '" + path + "' does not exist.");
}
/// if for some reason the configuration hasn't been loaded yet
if (configuration == null)
{
Trace.WriteLineIf(verbose, "'Configuration Engine': Creating new configuration named '" + name + "'.");
configuration = new XmlConfiguration();
configuration.ElementName = name;
Trace.WriteLineIf(verbose, "'Configuration Engine': Checking for formatting callback for the configuration named '" + name + "'.");
if (handler != null)
{
Trace.WriteLineIf(verbose, "'Configuration Engine': Formatting callback found for the configuration named '" + name + "', calling formatting callback to apply structure to the configuration.");
try
{
XmlConfigurationEventArgs e = new XmlConfigurationEventArgs(configuration, XmlConfigurationElementActions.None);
handler(null, e);
configuration = e.Element;
}
catch (System.Exception systemException)
{
Trace.WriteLineIf(verbose, "'Configuration Engine': An unexpected exception was encountered while reading the configuration named '" + name + "', dumping exception.");
System.Diagnostics.Trace.WriteLine(systemException);
}
}
}
Trace.WriteLineIf(verbose, "'Configuration Engine': Setting the path for the configuration named '" + name + "' and accepting changes to the configuration.");
/// let the configuration know where it lives
configuration.Path = path;
/// ensure that the configuration has no changes visible
configuration.AcceptChanges();
return(true);
}
/// <summary>
/// Writes a configuration to a path using the specified encryption engine. Takes windows security into account and checks for write access before trying to write to the path.
/// </summary>
/// <param name="path"></param>
/// <param name="configuration"></param>
/// <param name="encryptionEngine"></param>
/// <returns></returns>
public static bool WriteConfiguration(bool verbose, string path, XmlConfiguration configuration, FileEncryptionEngine encryptionEngine)
{
try
{
Trace.WriteLineIf(verbose, "'Configuration Engine': Checking to see if the path '" + path + "' exists.");
/// if the file exists, we need to try and read it
if (System.IO.File.Exists(path))
{
Trace.WriteLineIf(verbose, "'Configuration Engine': The path '" + path + "' exists.");
/// but first see if we have permissions to read it
using (SecurityAccessRight right = new SecurityAccessRight(path))
{
Trace.WriteLineIf(verbose, "'Configuration Engine': Checking to see if the path '" + path + "' has write access.");
/// if we don't have rights to the file
if (!right.AssertWriteAccess())
{
Trace.WriteLineIf(verbose, "'Configuration Engine': The path '" + path + "' does not have write access.");
Trace.WriteLineIf(verbose, "'Configuration Engine': Prompting for user intervention for the path '" + path + "'.");
if (verbose)
{
/// prompt to see what we should do about this
DialogResult result = ExceptionEngine.DisplayException(
null,
"Write access denied - Unable to write to file",
MessageBoxIcon.Error,
MessageBoxButtons.AbortRetryIgnore,
null,
"Write access has been denied for the file '" + path + "'.",
"Ignoring this exception may result in a loss of data if any options in this file were changed.");
switch (result)
{
case DialogResult.Abort:
Trace.WriteLineIf(verbose, "'Configuration Engine': Aborting attempt to write to the path '" + path + "' because of user intervention.");
return(false);
case DialogResult.Retry:
Trace.WriteLineIf(verbose, "'Configuration Engine': Retrying attempt to write to the path '" + path + "' because of user intervention.");
return(ConfigurationEngine.WriteConfiguration(verbose, path, configuration, encryptionEngine));
case DialogResult.Ignore:
Trace.WriteLineIf(verbose, "'Configuration Engine': Ignoring attempt to write to the path '" + path + "' because of user intervention.");
return(true);
//break;
}
;
}
else
{
/// it failed, but we're not in verbose mode so who cares?
return(true);
}
}
else
{
Trace.WriteLineIf(verbose, "'Configuration Engine': The path '" + path + "' has write access, preparing to write the configuration.");
/// rights to write to the file
/// ask the configuration engine to write our configuration file for us into our configuration
if (!ConfigurationEngine.WriteConfiguration(encryptionEngine, configuration, path))
{
Trace.WriteLineIf(verbose, "'Configuration Engine': Failed to write the configuration, throwing last exception from the ConfigurationEngine.");
throw ConfigurationEngine.LastException;
}
/// ensure that the configuration has no changes visible
if (configuration != null)
{
Trace.WriteLineIf(verbose, "'Configuration Engine': Succeeded in writing the configuration, accepting changes .");
configuration.AcceptChanges();
}
return(true);
}
}
}
else
{
Trace.WriteLineIf(verbose, "'Configuration Engine': The path '" + path + "' does not exist, preparing to write the configuration for the first time.");
/// ask the configuration engine to write our configuration file for us into our configuration
if (!ConfigurationEngine.WriteConfiguration(encryptionEngine, configuration, path))
{
Trace.WriteLineIf(verbose, "'Configuration Engine': Failed to write the configuration, throwing last exception from the ConfigurationEngine.");
throw ConfigurationEngine.LastException;
}
/// ensure that the configuration has no changes visible
if (configuration != null)
{
Trace.WriteLineIf(verbose, "'Configuration Engine': Succeeded in writing the configuration, accepting changes .");
configuration.AcceptChanges();
}
return(true);
}
}
catch (System.Exception systemException)
{
Trace.WriteLineIf(verbose, "'Configuration Engine': An unexpected exception was encountered while writing the configuration, dumping exception.");
System.Diagnostics.Trace.WriteLine(systemException);
Trace.WriteLineIf(verbose, "'Configuration Engine': Prompting for user intervention for the path '" + path + "'.");
if (verbose)
{
/// failed for some reason writing the file
/// prompt to see what we should do about this
DialogResult result = ExceptionEngine.DisplayException(
null,
"Exception encountered - Unable to write to file",
MessageBoxIcon.Error,
MessageBoxButtons.AbortRetryIgnore,
systemException,
"An exception was encountered while trying to write to the file '" + path + "'.",
"Ignoring this exception may result in a loss of data if any options in this file were changed");
switch (result)
{
case DialogResult.Abort:
Trace.WriteLineIf(verbose, "'Configuration Engine': Aborting attempt to write to the path '" + path + "' because of user intervention.");
return(false);
case DialogResult.Retry:
Trace.WriteLineIf(verbose, "'Configuration Engine': Retrying attempt to write to the path '" + path + "' because of user intervention.");
return(ConfigurationEngine.WriteConfiguration(verbose, path, configuration, encryptionEngine));
case DialogResult.Ignore:
Trace.WriteLineIf(verbose, "'Configuration Engine': Ignoring attempt to write to the path '" + path + "' because of user intervention.");
return(true);
}
;
}
}
return(true);
}
