class Aws::WAF::Types::SizeConstraint

<note markdown=“1”> This is **AWS WAF Classic** documentation. For more information, see

AWS WAF Classic][1

in the developer guide.

**For the latest version of AWS WAF**, use the AWS WAFV2 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.

</note>

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.

[1]: docs.aws.amazon.com/waf/latest/developerguide/classic-waf-chapter.html [2]: docs.aws.amazon.com/waf/latest/developerguide/waf-chapter.html

@note When making an API call, you may pass SizeConstraint

data as a hash:

    {
      field_to_match: { # required
        type: "URI", # required, accepts URI, QUERY_STRING, HEADER, METHOD, BODY, SINGLE_QUERY_ARG, ALL_QUERY_ARGS
        data: "MatchFieldData",
      },
      text_transformation: "NONE", # required, accepts NONE, COMPRESS_WHITE_SPACE, HTML_ENTITY_DECODE, LOWERCASE, CMD_LINE, URL_DECODE
      comparison_operator: "EQ", # required, accepts EQ, NE, LE, LT, GE, GT
      size: 1, # required
    }

@!attribute [rw] field_to_match

Specifies where in a web request to look for the size constraint.
@return [Types::FieldToMatch]

@!attribute [rw] text_transformation

Text transformations eliminate some of the unusual formatting that
attackers use in web requests in an effort to bypass AWS WAF. 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 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:

* Delete the following characters: \\ " ' ^

* Delete spaces before the following characters: / (

* Replace the following characters with a space: , ;

* Replace multiple spaces with one space

* Convert uppercase letters (A-Z) to lowercase (a-z)

**COMPRESS\_WHITE\_SPACE**

Use this option to replace the following characters with a space
character (decimal 32):

* \\f, formfeed, decimal 12

* \\t, tab, decimal 9

* \\n, newline, decimal 10

* \\r, carriage return, decimal 13

* \\v, vertical tab, decimal 11

* non-breaking space, decimal 160

`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:

* Replaces `(ampersand)quot;` with `"`

* Replaces `(ampersand)nbsp;` with a non-breaking space, decimal 160

* Replaces `(ampersand)lt;` with a "less than" symbol

* Replaces `(ampersand)gt;` with `>`

* Replaces characters that are represented in hexadecimal format,
  `(ampersand)#xhhhh;`, with the corresponding characters

* Replaces characters that are represented in decimal format,
  `(ampersand)#nnnn;`, with the corresponding characters

**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.
@return [String]

@!attribute [rw] comparison_operator

The type of comparison you want AWS WAF to perform. 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`
@return [String]

@!attribute [rw] size

The size in bytes that you want AWS WAF to compare against the size
of the specified `FieldToMatch`. 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
counts as one character. For example, the URI `/logo.jpg` is nine
characters long.
@return [Integer]

@see docs.aws.amazon.com/goto/WebAPI/waf-2015-08-24/SizeConstraint AWS API Documentation

Constants

SENSITIVE