Interface CfnSizeConstraintSet.ISizeConstraintProperty
AWS WAF Classic support will end on September 30, 2025.
Namespace: Amazon.CDK.AWS.WAF
Assembly: Amazon.CDK.Lib.dll
Syntax (csharp)
public interface CfnSizeConstraintSet.ISizeConstraintPropertySyntax (vb)
Public Interface CfnSizeConstraintSet.ISizeConstraintPropertyRemarks
This is <em>AWS WAF Classic</em> documentation. For more information, see <a href="https://docs.aws.amazon.com/waf/latest/developerguide/classic-waf-chapter.html">AWS WAF Classic</a> in the developer guide.
For the latest version of AWS WAF , use the AWS WAF V2 API and see the AWS WAF Developer Guide . With the latest version, AWS WAF has a single set of endpoints for regional and global use.
Specifies a constraint on the size of a part of the web request. AWS WAF uses the Size , ComparisonOperator , and FieldToMatch to build an expression in the form of " Size ComparisonOperator size in bytes of FieldToMatch ". If that expression is true, the SizeConstraint is considered to match.
ExampleMetadata: fixture=_generated
Examples
// The code below shows an example of how to instantiate this type.
// The values are placeholders you should change.
using Amazon.CDK.AWS.WAF;
var sizeConstraintProperty = new SizeConstraintProperty {
ComparisonOperator = "comparisonOperator",
FieldToMatch = new FieldToMatchProperty {
Type = "type",
// the properties below are optional
Data = "data"
},
Size = 123,
TextTransformation = "textTransformation"
};Synopsis
Properties
| ComparisonOperator | The type of comparison you want AWS WAF to perform. |
| FieldToMatch | The part of a web request that you want to inspect, such as a specified header or a query string. |
| Size | The size in bytes that you want AWS WAF to compare against the size of the specified |
| TextTransformation | Text transformations eliminate some of the unusual formatting that attackers use in web requests in an effort to bypass AWS WAF . |
Properties
ComparisonOperator
The type of comparison you want AWS WAF to perform.
string ComparisonOperator { get; }Property Value
Remarks
AWS WAF uses this in combination with the provided Size and FieldToMatch to build an expression in the form of " Size ComparisonOperator size in bytes of FieldToMatch ". If that expression is true, the SizeConstraint is considered to match.
EQ : Used to test if the Size is equal to the size of the FieldToMatch
NE : Used to test if the Size is not equal to the size of the FieldToMatch
LE : Used to test if the Size is less than or equal to the size of the FieldToMatch
LT : Used to test if the Size is strictly less than the size of the FieldToMatch
GE : Used to test if the Size is greater than or equal to the size of the FieldToMatch
GT : Used to test if the Size is strictly greater than the size of the FieldToMatch
FieldToMatch
The part of a web request that you want to inspect, such as a specified header or a query string.
object FieldToMatch { get; }Property Value
Remarks
Size
The size in bytes that you want AWS WAF to compare against the size of the specified FieldToMatch .
double Size { get; }Property Value
Remarks
AWS WAF uses this in combination with ComparisonOperator and FieldToMatch to build an expression in the form of " Size ComparisonOperator size in bytes of FieldToMatch ". If that expression is true, the SizeConstraint is considered to match.
Valid values for size are 0 - 21474836480 bytes (0 - 20 GB).
If you specify URI for the value of Type , the / in the URI path that you specify counts as one character. For example, the URI /logo.jpg is nine characters long.
TextTransformation
Text transformations eliminate some of the unusual formatting that attackers use in web requests in an effort to bypass AWS WAF .
string TextTransformation { get; }Property Value
Remarks
If you specify a transformation, AWS WAF performs the transformation on FieldToMatch before inspecting it for a match.
You can only specify a single type of TextTransformation.
Note that if you choose BODY for the value of Type , you must choose NONE for TextTransformation because Amazon CloudFront forwards only the first 8192 bytes for inspection.
NONE
Specify NONE if you don't want to perform any text transformations.
CMD_LINE
When you're concerned that attackers are injecting an operating system command line command and using unusual formatting to disguise some or all of the command, use this option to perform the following transformations:
COMPRESS_WHITE_SPACE
Use this option to replace the following characters with a space character (decimal 32):
COMPRESS_WHITE_SPACE also replaces multiple spaces with one space.
HTML_ENTITY_DECODE
Use this option to replace HTML-encoded characters with unencoded characters. HTML_ENTITY_DECODE performs the following operations:
LOWERCASE
Use this option to convert uppercase letters (A-Z) to lowercase (a-z).
URL_DECODE
Use this option to decode a URL-encoded value.