Package com.fasterxml.jackson.core

Class StreamReadConstraints

java.lang.Object

com.fasterxml.jackson.core.StreamReadConstraints

All Implemented Interfaces:

Serializable

public class StreamReadConstraints
extends Object
implements Serializable

The constraints to use for streaming reads: used to guard against malicious input by preventing processing of "too big" input constructs (values, structures). Constraints are registered with TokenStreamFactory (such as JsonFactory); if nothing explicitly specified, default constraints are used.

Currently constrained aspects, with default settings, are:

• Maximum Number value length: default 1000 (see DEFAULT_MAX_NUM_LEN)
• Maximum String value length: default 20_000_000 (see DEFAULT_MAX_STRING_LEN)
• Maximum Property name length: default 50_000 (see DEFAULT_MAX_NAME_LEN)
• Maximum Nesting depth: default 1000 (see DEFAULT_MAX_DEPTH)
• Maximum Document length: default unlimited (coded as -1, (see DEFAULT_MAX_DOC_LEN)

Since:

2.15

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static final class	StreamReadConstraints.Builder

Field Summary

Fields

Modifier and Type	Field	Description
static final int	DEFAULT_MAX_DEPTH	Default setting for maximum depth: see StreamReadConstraints.Builder.maxNestingDepth(int) for details.
static final long	DEFAULT_MAX_DOC_LEN	Default setting for maximum document length: see StreamReadConstraints.Builder.maxDocumentLength(long) for details.
static final int	DEFAULT_MAX_NAME_LEN	Default setting for maximum name length: see StreamReadConstraints.Builder.maxNameLength(int) for details.
static final int	DEFAULT_MAX_NUM_LEN
static final int	DEFAULT_MAX_STRING_LEN	Default setting for maximum string length: see StreamReadConstraints.Builder.maxStringLength(int) for details.

Method Summary

Modifier and Type	Method	Description
static StreamReadConstraints.Builder	builder()
static StreamReadConstraints	defaults()
long	getMaxDocumentLength()	Accessor for maximum document length.
int	getMaxNameLength()	Accessor for maximum length of names to decode.
int	getMaxNestingDepth()	Accessor for maximum depth.
int	getMaxNumberLength()	Accessor for maximum length of numbers to decode.
int	getMaxStringLength()	Accessor for maximum length of strings to decode.
boolean	hasMaxDocumentLength()	Convenience method, basically same as:
static void	overrideDefaultStreamReadConstraints(StreamReadConstraints streamReadConstraints)	Override the default StreamReadConstraints.
StreamReadConstraints.Builder	rebuild()
void	validateBigIntegerScale(int scale)	Convenience method that can be used to verify that a conversion to BigInteger StreamConstraintsException is thrown.
void	validateDocumentLength(long len)	Convenience method that can be used to verify that the document length does not exceed the maximum specified by this constraints object (if any): if it does, a StreamConstraintsException is thrown.
void	validateFPLength(int length)	Convenience method that can be used to verify that a floating-point number of specified length does not exceed maximum specified by this constraints object: if it does, a StreamConstraintsException is thrown.
void	validateIntegerLength(int length)	Convenience method that can be used to verify that an integer number of specified length does not exceed maximum specific by this constraints object: if it does, a StreamConstraintsException is thrown.
void	validateNameLength(int length)	Convenience method that can be used to verify that a name of specified length does not exceed maximum specific by this constraints object: if it does, a StreamConstraintsException is thrown.
void	validateNestingDepth(int depth)	Convenience method that can be used to verify that the nesting depth does not exceed the maximum specified by this constraints object: if it does, a StreamConstraintsException is thrown.
void	validateStringLength(int length)	Convenience method that can be used to verify that a String of specified length does not exceed maximum specific by this constraints object: if it does, a StreamConstraintsException is thrown.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

DEFAULT_MAX_DEPTH

public static final int DEFAULT_MAX_DEPTH

Default setting for maximum depth: see StreamReadConstraints.Builder.maxNestingDepth(int) for details.

See Also:

• Constant Field Values

DEFAULT_MAX_DOC_LEN

public static final long DEFAULT_MAX_DOC_LEN

Default setting for maximum document length: see StreamReadConstraints.Builder.maxDocumentLength(long) for details.

See Also:

• Constant Field Values

DEFAULT_MAX_NUM_LEN

public static final int DEFAULT_MAX_NUM_LEN

Since:

2.16

See Also:

• Constant Field Values

DEFAULT_MAX_STRING_LEN

public static final int DEFAULT_MAX_STRING_LEN

Default setting for maximum string length: see StreamReadConstraints.Builder.maxStringLength(int) for details.

NOTE: Jackson 2.15.0 initially used a lower setting (5_000_000).

See Also:

• Constant Field Values

DEFAULT_MAX_NAME_LEN

public static final int DEFAULT_MAX_NAME_LEN

Default setting for maximum name length: see StreamReadConstraints.Builder.maxNameLength(int) for details.

Since:

2.16

See Also:

• Constant Field Values

Method Details

overrideDefaultStreamReadConstraints

public static void overrideDefaultStreamReadConstraints(StreamReadConstraints streamReadConstraints)

Override the default StreamReadConstraints. These defaults are only used when JsonFactory instances are not configured with their own StreamReadConstraints.

Library maintainers should not set this as it will affect other code that uses Jackson. Library maintainers who want to configure StreamReadConstraints for the Jackson usage within their lib should create ObjectMapper instances that have a JsonFactory instance with the required StreamReadConstraints.

This method is meant for users delivering applications. If they use this, they set it when they start their application to avoid having other code initialize their mappers before the defaults are overridden.

Parameters:

streamReadConstraints - new default for StreamReadConstraints (a null value will reset to built-in default)

Since:

v2.15.2

See Also:

• defaults()
• builder()

builder

public static StreamReadConstraints.Builder builder()

defaults

public static StreamReadConstraints defaults()

Returns:

the default StreamReadConstraints (when none is set on the JsonFactory explicitly)

See Also:

• overrideDefaultStreamReadConstraints(com.fasterxml.jackson.core.StreamReadConstraints)

rebuild

public StreamReadConstraints.Builder rebuild()

Returns:

New StreamReadConstraints.Builder initialized with settings of this constraints instance

getMaxNestingDepth

public int getMaxNestingDepth()

Accessor for maximum depth. see StreamReadConstraints.Builder.maxNestingDepth(int) for details.

Returns:

Maximum allowed depth

getMaxDocumentLength

public long getMaxDocumentLength()

Accessor for maximum document length. see StreamReadConstraints.Builder.maxDocumentLength(long) for details.

Returns:

Maximum allowed depth

hasMaxDocumentLength

public boolean hasMaxDocumentLength()

Convenience method, basically same as:

  getMaxDocumentLength() > 0L

Returns:

True if this constraints instance has a limit for maximum document length to enforce; false otherwise.

getMaxNumberLength

public int getMaxNumberLength()

Accessor for maximum length of numbers to decode. see StreamReadConstraints.Builder.maxNumberLength(int) for details.

Returns:

Maximum allowed number length

getMaxStringLength

public int getMaxStringLength()

Accessor for maximum length of strings to decode. see StreamReadConstraints.Builder.maxStringLength(int) for details.

Returns:

Maximum allowed string length

getMaxNameLength

public int getMaxNameLength()

Accessor for maximum length of names to decode. see StreamReadConstraints.Builder.maxNameLength(int) for details.

Returns:

Maximum allowed name length

validateNestingDepth

public void validateNestingDepth(int depth)
                          throws StreamConstraintsException

Convenience method that can be used to verify that the nesting depth does not exceed the maximum specified by this constraints object: if it does, a StreamConstraintsException is thrown.

Parameters:

depth - count of unclosed objects and arrays

Throws:

StreamConstraintsException - If depth exceeds maximum

validateDocumentLength

public void validateDocumentLength(long len)
                            throws StreamConstraintsException

Convenience method that can be used to verify that the document length does not exceed the maximum specified by this constraints object (if any): if it does, a StreamConstraintsException is thrown.

Parameters:

len - Current length of processed document content

Throws:

StreamConstraintsException - If length exceeds maximum

Since:

2.16

validateFPLength

public void validateFPLength(int length)
                      throws StreamConstraintsException

Convenience method that can be used to verify that a floating-point number of specified length does not exceed maximum specified by this constraints object: if it does, a StreamConstraintsException is thrown.

Parameters:

length - Length of number in input units

Throws:

StreamConstraintsException - If length exceeds maximum

validateIntegerLength

public void validateIntegerLength(int length)
                           throws StreamConstraintsException

Convenience method that can be used to verify that an integer number of specified length does not exceed maximum specific by this constraints object: if it does, a StreamConstraintsException is thrown.

Parameters:

length - Length of number in input units

Throws:

StreamConstraintsException - If length exceeds maximum

validateStringLength

public void validateStringLength(int length)
                          throws StreamConstraintsException

Convenience method that can be used to verify that a String of specified length does not exceed maximum specific by this constraints object: if it does, a StreamConstraintsException is thrown.

Parameters:

length - Length of string in input units

Throws:

StreamConstraintsException - If length exceeds maximum

validateNameLength

public void validateNameLength(int length)
                        throws StreamConstraintsException

Convenience method that can be used to verify that a name of specified length does not exceed maximum specific by this constraints object: if it does, a StreamConstraintsException is thrown.

Parameters:

length - Length of name in input units

Throws:

StreamConstraintsException - If length exceeds maximum

validateBigIntegerScale

public void validateBigIntegerScale(int scale)
                             throws StreamConstraintsException

Convenience method that can be used to verify that a conversion to BigInteger StreamConstraintsException is thrown.

Parameters:

scale - Scale (possibly negative) of BigDecimal to convert

Throws:

StreamConstraintsException - If magnitude (absolute value) of scale exceeds maximum allowed