In Kong Event Gateway, you can use a policy’s condition field to determine whether a certain policy should be executed.
For example, you can create a condition that selects all topics that end with the suffix my_suffix:
"condition": "context.topic.name.endsWith('my_suffix')"
Conditions must be between 1 and 1000 characters long.
For policy conditions and template strings, Kong Event Gateway supports a subset of JavaScript operators and expressions:
|
Operator or expression type |
Operator or function |
|---|---|
| Logical operators |
&&, ||, !
|
| Comparison operators |
==, !=, <, <=, >, >=
|
| Concatenation operator |
+
|
| Relational operator |
in
|
| String functions |
includes, startsWith, endsWith, substring, match
|
Kong Event Gateway supports the following string functions in conditional fields:
includes: Performs a case-sensitive search to determine whether a given string may be found within this string, as defined in the JavaScript standard.startsWith: Determines whether the string begins with the characters of a specified string, equivalent to the JavaScript standard function.endsWith: Determines whether the string ends with the characters of a specified string, equivalent to the JavaScript standard function.substring: Returns the part of this string from the start index up to and excluding the end index.match: Retrieves the result of matching this string against an RE2 regular expression string.