EncryptionFilter (Helidon Project 2.6.7 API)

java.lang.Object
- io.helidon.config.encryption.EncryptionFilter

All Implemented Interfaces:

ConfigFilter
```
public final class EncryptionFilter
extends Object
implements ConfigFilter
```
Provides possibility to decrypt passwords from configuration sources. Configuration can be used to enforce encryption (e.g. we will fail on clear-text value).
Password in properties must be stored as follows:
- ${AES=base64} - encrypted password using a master password (must be provided to prime through configuration, system property or environment variable)
- ${RSA=base64} - encrypted password using a public key (private key must be available to Prime instance, its location must be provided to prime through configuration, system property or environment variable)
- ${ALIAS=alias_name} - no longer needed, please use ${alias_name}
- ${CLEAR=text} - clear-text password. Intentionally denoting this value as a protectable one, so we can enforce encryption (e.g. in prod)
Example:
```
 google_client_secret=${AES=mYRkg+4Q4hua1kvpCCI2hg==}
 service_password=${RSA=mYRkg+4Q4hua1kvpCCI2hg==}
 another_password=${service_password}
 cleartext_password=${CLEAR=known_password}
 
```
See Also:

ConfigProperties.PRIVATE_KEYSTORE_PATH_ENV_VARIABLE, ConfigProperties.MASTER_PASSWORD_ENV_VARIABLE, ConfigProperties.MASTER_PASSWORD_CONFIG_KEY, ConfigProperties.REQUIRE_ENCRYPTION_ENV_VARIABLE

Nested Class Summary

Nested Classes
Modifier and Type Class Description

static class EncryptionFilter.Builder
Builder to programmatically setup EncryptionFilter.

Field Summary
- Fields inherited from interface io.helidon.config.spi.ConfigFilter
  PRIORITY

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`String`	`apply(Config.Key key, String stringValue)`	Filters an elementary config value before it is made available to the application via the `Config` API.
`static EncryptionFilter.Builder`	`builder()`	Builder to programmatically configure filter.
`static Function<Config,ConfigFilter>`	`fromConfig()`	Create a filter based on configuration (it takes its configuration from the configuration object it filters).

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface io.helidon.config.spi.ConfigFilter
init

- Method Detail
  - fromConfig
```
public static Function<Config,ConfigFilter> fromConfig()
```
    Create a filter based on configuration (it takes its configuration from the configuration object it filters).
    
    Returns:
    
    ConfigFilter instance to register to config
  - builder
```
public static EncryptionFilter.Builder builder()
```
    Builder to programmatically configure filter.
    
    Returns:
    
    Builder instance
  - apply
```
public String apply(Config.Key key,
                    String stringValue)
```
    Description copied from interface: ConfigFilter
    
    Filters an elementary config value before it is made available to the application via the Config API.
    
    Specified by:
    
    apply in interface ConfigFilter
    
    Parameters:
    
    key - configuration key associated with the Config node
    
    stringValue - original value to be filtered, never null
    
    Returns:
    
    original value or filtered (changed) value, never null