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Figure 5-7. Retrieving custom configuration data You can also change this custom section and update the web.config file in the same way as before. Custom section handlers can get a fair bit more sophisticated. For example, you can use additional attributes to validate configuration string values (look for the attributes that derive from ConfigurationValidatorAttribute), and you can create sections with nested elements and more complex structures. For more information about extending ASP.NET configuration files, refer to the MSDN Help.

ASP .NET never serves requests for configuration files, because they often contain sensitive information. However, even with this basic restriction in place, you may want to increase security by encrypting sections of a configuration file. This is a recommended practice for data such as connections and user-specific details. (Of course, any passwords should also be encrypted, although ideally they won t be placed in a configuration file at all.) ASP.NET supports two encryption options: RSA: The RSA provider allows you to create a key pair that is then used to encrypt the configuration data. The advantage is that you can copy this key between computers (for example, if you want to use the same configuration file with all the servers in a web farm). The RSA provider is used by default. DPAPI: The DPAPI (data protection API) provider uses a protection mechanism that s built into Windows. Configuration files are encrypted using a machine-specific key. The advantage is that you don t need to manage or maintain the key. The disadvantage is that you can t use a configuration file encrypted in this way on any other computer. With both of these options, encryption is completely transparent. When you retrieve a setting from an encrypted section, ASP.NET automatically performs the decryption and returns the plain text to your code (provided the required key is available). Similarly, if you modify a value programmatically and save it, encryption is performed automatically. However, you won t be able to edit that section of the web.config file by hand. But you can still use WAT, the IIS snap-in, or your own custom code. When you use the configuration API, the decryption and encryption steps are performed automatically when you read from or write to a protected section.

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To enable encryption programmatically, you need to retrieve the corresponding ConfigurationSection.SectionInformation object and then call the ProtectSection() method. Any existing data is encrypted at this point, and any changes you make from this point on are automatically encrypted. If you want to switch off encryption, you simply use the corresponding UnprotectSection() method. Here s an example that encrypts the application section if it s unencrypted or switches off encryption if it is: Configuration config = WebConfigurationManager.OpenWebConfiguration( Request.ApplicationPath); ConfigurationSection appSettings = config.GetSection("appSettings"); if (appSettings.SectionInformation.IsProtected) { appSettings.SectionInformation.UnprotectSection(); } else { appSettings.SectionInformation.ProtectSection( "DataProtectionConfigurationProvider"); } config.Save; Here s an excerpted version of what a protected <appSettings> section looks like: <appSettings> <EncryptedData> <CipherData> <CipherValue>AQAAANCMnd8BFdERjHoAwE/Cl+sBAAAAIEokx++BE0mpDaPjVrJ/jQQAAAA CAAAAAAADZgAAqAAAABAAAAClK6Kt++FOJoJrMZs12KWdAAAAAASAAACgAAAAEAAAAFYA23iGZF1pe FwDPTKM2/1IAQAAYG/Y4cmSlEVs/a4yK7KXoYbWtjDsQBnMAcndmK3q+ODw/8...</CipherValue> </CipherData> </EncryptedData> </appSettings> Note that you can t tell anything about the encrypted data, including the number of settings, the key names of settings, or their data types.

This method simply returns a relative path that will be stored in the database along with the filename. By default, this looks at the attribute of the field to determine what the directory should be, and even subclasses should respect this behavior. Exactly how that attribute is used, however, is where subclasses can customize this method to great effect. Normally, Django creates a directory name using two pieces of information: the string itself and the current date. The date the file was uploaded is applied to the directory name, replacing certain characters with portions of the date. This allows individual fields to more accurately control where their files are stored, which helps keep directories smaller, and can possibly even make better use of disk capacity. In a subclass, however, it may be more useful to generate the directory name based on some other type of information, such as the current site s domain name in multisite setups, or the Internet Protocol (IP) address of the machine where the upload was received, in larger production environments where there are multiple Web servers sharing common storage.

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