DatabaseEntry (Javadocs [I2P+ 2.11.0+]

java.lang.Object
- net.i2p.data.DataStructureImpl
- - net.i2p.data.DatabaseEntry

All Implemented Interfaces:

Serializable, DataStructure

Direct Known Subclasses:

LeaseSet, RouterInfo
```
public abstract class DatabaseEntry
extends DataStructureImpl
```
Base class for data structures stored in the I2P network database (NetDb).
DatabaseEntry provides common infrastructure for NetDb-storable objects:
- Core Types: Base for LeaseSet and RouterInfo
- Unified Interface: Simplifies NetDB and I2NP implementation
- Common Operations: Shared methods for hashing, routing, and signing
- Integrity Protection: Prevents modification after signing
Key Features:
- SHA-256 Hash: Unique identifier for database storage and lookup
- Routing Key: Modified hash for distributed hash Table (DHT) routing
- Timestamp: Creation or last-modified time for cache management
- Signatures: Cryptographic signatures for authenticity verification
- Type Constants: Standardized type identifiers for all NetDb entries
Supported Entry Types:
- KEY_TYPE_ROUTERINFO - Router information and capabilities
- KEY_TYPE_LEASESET - Legacy LeaseSet format
- KEY_TYPE_LS2 - Modern LeaseSet2 format
- KEY_TYPE_META_LS2 - MetaLeaseSet for advanced routing
Integrity Protection:
- Immutable After Signing: Objects cannot be modified once signed
- IllegalStateException: Thrown when modification is attempted
- NetDb Protection: Prevents corruption of network database
- Message Safety: Protects I2NP messages from tampering
Usage Patterns:
- Network Storage: Entries stored in distributed hash table
- Lookup Operations: Fast retrieval by hash or routing key
- Cache Management: Timestamp-based expiration and refresh
- Floodfill: Distribution of new and updated entries
Security Considerations:
- Signature Verification: Always verify before trusting entries
- Timestamp Validation: Check for stale or expired entries
- Hash Collision: Verify SHA-256 hash matches content
- Routing Key Security: Protect against routing attacks
Implementation Notes:
- 0.8.2: Initial implementation with retrofitting
- Code Consolidation: Reduces instanceof usage throughout codebase
- Thread Safety: Protection not guaranteed to be thread-safe
- Object Reuse: Do not reuse DatabaseEntry instances
Warning:
- Direct Modification: Avoid modifying internal byte[] objects
- Corruption Avenues: Multiple paths can bypass protection
- Careful Usage: Protection is not foolproof against all attacks
See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field and Description
`protected Signature`	`_signature`
`static int`	`KEY_TYPE_ENCRYPTED_LS2` Encrypted LeaseSet 2 type.
`static int`	`KEY_TYPE_LEASESET`
`static int`	`KEY_TYPE_LS2` LeaseSet 2 type.
`static int`	`KEY_TYPE_META_LS2` Meta LeaseSet 2 type.
`static int`	`KEY_TYPE_ROUTERINFO` these are the same as in i2np's DatabaseStoreMessage
`static int`	`KEY_TYPE_SERVICE_LIST` Service list type.
`static int`	`KEY_TYPE_SERVICE_RECORD` Service record type.

Constructor Summary

Constructors
Constructor and Description

DatabaseEntry()

Constructors
Constructor and Description
`DatabaseEntry()`

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method and Description
`protected abstract byte[]`	`getBytes()` Returns the raw payload data, excluding the signature, to be signed by sign().
`abstract long`	`getDate()` A common interface to the timestamp of the two subclasses.
`Hash`	`getHash()` A common interface to the Hash of the two subclasses.
`abstract KeysAndCert`	`getKeysAndCert()` Get the keys and the cert Identical to getDestination() in LeaseSet, and getIdentity() in RouterInfo.
`boolean`	`getReceivedAsPublished()` If true, we received this LeaseSet by a remote peer publishing it to us, rather than by searching for it ourselves or locally creating it.
`boolean`	`getReceivedAsReply()` If true, we received this LeaseSet by searching for it Default false.
`Hash`	`getReceivedBy()` The Hash of the local client that received this LS, null if the router or unknown.
`Hash`	`getRoutingKey()` Get the routing key for the structure using the current modifier in the RoutingKeyGenerator.
`Signature`	`getSignature()` Retrieve the proof that the identity stands behind the info here
`protected SigningPublicKey`	`getSigningPublicKey()` Identical to getDestination().getSigningPublicKey() in LeaseSet, and getIdentity().getSigningPublicKey() in RouterInfo.
`abstract int`	`getType()` Get the type of the data structure.
`boolean`	`isLeaseSet()` Convenience method, is the type any variant of leaseset?
`static boolean`	`isLeaseSet(int type)` Convenience method, is the type any variant of leaseset?
`boolean`	`isRouterInfo()` Convenience method, is the type any variant of router info?
`void`	`setReceivedAsPublished()` Marks this entry as received via published mode.
`void`	`setReceivedAsReply()` set to true
`void`	`setReceivedBy(Hash receivedBy)` Sets the local client that received this entry.
`void`	`setSignature(Signature signature)` Configure the proof that the entity stands behind the info here
`void`	`sign(SigningPrivateKey key)` Sign the structure using the supplied signing key
`boolean`	`validateRoutingKey()` Validates the routing key for this entry.
`boolean`	`verifySignature()` This is the same as isValid() in RouterInfo or verifySignature() in LeaseSet.

Methods inherited from class net.i2p.data.DataStructureImpl
calculateHash, fromBase64, fromByteArray, read, toBase64, toByteArray

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

Methods inherited from interface net.i2p.data.DataStructure
readBytes, writeBytes

- Field Detail
  - _signature
```
protected volatile Signature _signature
```
  - KEY_TYPE_ENCRYPTED_LS2
```
public static final int KEY_TYPE_ENCRYPTED_LS2
```
    Encrypted LeaseSet 2 type.
    
    See Also:
    
    Constant Field Values
  - KEY_TYPE_LEASESET
```
public static final int KEY_TYPE_LEASESET
```
    See Also:
    
    Constant Field Values
  - KEY_TYPE_LS2
```
public static final int KEY_TYPE_LS2
```
    LeaseSet 2 type.
    
    See Also:
    
    Constant Field Values
  - KEY_TYPE_META_LS2
```
public static final int KEY_TYPE_META_LS2
```
    Meta LeaseSet 2 type.
    
    See Also:
    
    Constant Field Values
  - KEY_TYPE_ROUTERINFO
```
public static final int KEY_TYPE_ROUTERINFO
```
    these are the same as in i2np's DatabaseStoreMessage
    
    See Also:
    
    Constant Field Values
  - KEY_TYPE_SERVICE_LIST
```
public static final int KEY_TYPE_SERVICE_LIST
```
    Service list type.
    
    See Also:
    
    Constant Field Values
  - KEY_TYPE_SERVICE_RECORD
```
public static final int KEY_TYPE_SERVICE_RECORD
```
    Service record type.
    
    See Also:
    
    Constant Field Values
- Constructor Detail
  - DatabaseEntry
```
public DatabaseEntry()
```
- Method Detail
  - getBytes
```
protected abstract byte[] getBytes()
                            throws DataFormatException
```
    Returns the raw payload data, excluding the signature, to be signed by sign(). Most callers should use writeBytes() or toByteArray() instead.
    
    Returns:
    
    the raw payload data, or null on error (for example, if this is a RouterInfo, a DataFormatException is thrown instead)
    
    Throws:
    
    DataFormatException
  - getDate
```
public abstract long getDate()
```
    A common interface to the timestamp of the two subclasses. Identical to getEarliestLeaseDate() in LeaseSet, and getPublished() in RouterInfo. Note that for a LeaseSet this will be in the future, and for a RouterInfo it will be in the past. Either way, it's a timestamp.
  - getHash
```
public Hash getHash()
```
    A common interface to the Hash of the two subclasses. Identical to getDestination().calculateHash() in LeaseSet, and getIdentity().getHash() in RouterInfo.
    
    Returns:
    
    Hash or null
  - getKeysAndCert
```
public abstract KeysAndCert getKeysAndCert()
```
    Get the keys and the cert Identical to getDestination() in LeaseSet, and getIdentity() in RouterInfo.
    
    Returns:
    
    KAC or null
  - getReceivedAsPublished
```
public boolean getReceivedAsPublished()
```
    If true, we received this LeaseSet by a remote peer publishing it to us, rather than by searching for it ourselves or locally creating it. Default false.
  - getReceivedAsReply
```
public boolean getReceivedAsReply()
```
    If true, we received this LeaseSet by searching for it Default false.
  - getReceivedBy
```
public Hash getReceivedBy()
```
    The Hash of the local client that received this LS, null if the router or unknown.
  - getRoutingKey
```
public Hash getRoutingKey()
```
    Get the routing key for the structure using the current modifier in the RoutingKeyGenerator. This only calculates a new one when necessary though (if the generator's key modifier changes)
    
    Throws:
    
    IllegalStateException - if not in RouterContext
  - getSignature
```
public Signature getSignature()
```
    Retrieve the proof that the identity stands behind the info here
  - getSigningPublicKey
```
protected SigningPublicKey getSigningPublicKey()
```
    Identical to getDestination().getSigningPublicKey() in LeaseSet, and getIdentity().getSigningPublicKey() in RouterInfo.
    
    Returns:
    
    SPK or null
  - getType
```
public abstract int getType()
```
    Get the type of the data structure. This should be faster than instanceof.
    
    Returns:
    
    KEY_TYPE_ROUTERINFO or KEY_TYPE_LEASESET or LS2 types
  - isLeaseSet
```
public boolean isLeaseSet()
```
    Convenience method, is the type any variant of leaseset?
    
    Returns:
    
    true for any type of LeaseSet, false for RouterInfo, false for others
  - isLeaseSet
```
public static boolean isLeaseSet(int type)
```
    Convenience method, is the type any variant of leaseset?
    
    Returns:
    
    true for any type of LeaseSet, false for RouterInfo, false for others
  - isRouterInfo
```
public boolean isRouterInfo()
```
    Convenience method, is the type any variant of router info?
    
    Returns:
    
    true for any type of RouterInfo, false for LeaseSet, false for others
  - setReceivedAsPublished
```
public void setReceivedAsPublished()
```
    Marks this entry as received via published mode.
  - setReceivedAsReply
```
public void setReceivedAsReply()
```
    set to true
  - setReceivedBy
```
public void setReceivedBy(Hash receivedBy)
```
    Sets the local client that received this entry.
  - setSignature
```
public void setSignature(Signature signature)
```
    Configure the proof that the entity stands behind the info here
    
    Throws:
    
    IllegalStateException - if already signed
  - sign
```
public void sign(SigningPrivateKey key)
          throws DataFormatException
```
    Sign the structure using the supplied signing key
    
    Throws:
    
    IllegalStateException - if already signed
    
    DataFormatException
  - validateRoutingKey
```
public boolean validateRoutingKey()
```
    Validates the routing key for this entry.
    
    Throws:
    
    IllegalStateException - if not in RouterContext
  - verifySignature
```
public boolean verifySignature()
```
    This is the same as isValid() in RouterInfo or verifySignature() in LeaseSet.
    
    Returns:
    
    valid

Class DatabaseEntry

Field Summary

Constructor Summary

Method Summary

Methods inherited from class net.i2p.data.DataStructureImpl

Methods inherited from class java.lang.Object

Methods inherited from interface net.i2p.data.DataStructure

Field Detail

_signature

KEY_TYPE_ENCRYPTED_LS2

KEY_TYPE_LEASESET

KEY_TYPE_LS2

KEY_TYPE_META_LS2

KEY_TYPE_ROUTERINFO

KEY_TYPE_SERVICE_LIST

KEY_TYPE_SERVICE_RECORD

Constructor Detail

DatabaseEntry

Method Detail

getBytes

getDate

getHash

getKeysAndCert

getReceivedAsPublished

getReceivedAsReply

getReceivedBy

getRoutingKey

getSignature

getSigningPublicKey

getType

isLeaseSet

isLeaseSet

isRouterInfo

setReceivedAsPublished

setReceivedAsReply

setReceivedBy

setSignature

sign

validateRoutingKey

verifySignature