Sourced from github.com/open-policy-agent/opa's releases.

v1.12.2

This bug fix release address issues found in the new string interpolation feature

• Add (*TemplateString).Copy() method (#8159) authored by @​anderseknert
• Fix template string not serialized with escaped { (#8161) authored by @​anderseknert
• fix(ast): skip template string vars in ref safety (#8174) authored by @​thevilledev
• fix(ast): use original var names in template error (#8180) authored by @​thevilledev

v1.12.1

This bug fix release reverts a change to regex.replace that unintentionally changed its behaviour for anchored regular expressions.

• Revert "topdown: make regex.replace respect cancellation" (authored by @​srenatus)

v1.12.0

This release contains a mix of new features, performance improvements, and bugfixes. Notably:

• Support for String Interpolation in the Rego language
• Faster compilation and runtime
• Fixes published in the v1.11.1 release

String Interpolation (#4733)

The Rego language has been extended to support String Interpolation, which provides a readable means to compose strings containing dynamic values determined at evaluation time.

An interpolated string is composed of a template-string containing zero or more template-expressions that evaluates to a value at evaluation time. The $ character prefix identifies a template-string, and template-expressions are declared by being enclosed in curly-braces ({, }).

Additionally, undefined template-expression values don't halt evaluation; instead, <undefined> will be injected into the generated string.

package interpolation
allowed_roles := ["admin", "employee"]
default role := "guest"
role := input.role
deny contains $"User {input.username}'s role was '{role}', but must be one of {allowed_roles}" if {
not role in allowed_roles
}

{
</tr></table> 

... (truncated)

Sourced from github.com/open-policy-agent/opa's changelog.

1.12.2

This bug fix release address issues found in the new string interpolation feature

• Add (*TemplateString).Copy() method (#8159) authored by @​anderseknert
• Fix template string not serialized with escaped { (#8161) authored by @​anderseknert
• fix(ast): skip template string vars in ref safety (#8174) authored by @​thevilledev
• fix(ast): use original var names in template error (#8180) authored by @​thevilledev

1.12.1

This bug fix release reverts a change to regex.replace that unintentionally changed its behaviour for anchored regular expressions.

• Revert "topdown: make regex.replace respect cancellation" (authored by @​srenatus)

1.12.0

This release contains a mix of new features, performance improvements, and bugfixes. Notably:

• Support for string interpolation in the Rego language
• Faster compilation and runtime
• Fixes published in the v1.11.1 release

String Interpolation (#4733)

The Rego language has been extended to support String Interpolation, which provides a readable means to compose strings containing dynamic values determined at evaluation time.

An interpolated string is composed of a template-string containing zero or more template-expressions that evaluates to a value at evaluation time. The $ character prefix identifies a template-string, and template-expressions are declared by being enclosed in curly-braces ({, }).

Additionally, undefined template-expression values don't halt evaluation; instead, <undefined> will be injected into the generated string.

package interpolation
allowed_roles := ["admin", "employee"]
default role := "guest"
role := input.role
deny contains $"User {input.username}'s role was '{role}', but must be one of {allowed_roles}" if {
not role in allowed_roles
}

{
  "deny": [
    "User <undefined>'s role was 'guest', but must be one of [\"admin\", \"employee\"]"
</tr></table> 

... (truncated)

• 89c6537 Release v1.12.2
• 92dd54d Release v1.12.1
• fb09d24 Revert "topdown: make regex.replace respect cancellation"
• d61ac38 Prepare v1.12.0 release (#8144)
• 5a0dc47 Template string performance improvements and more (#8143)
• f5c3743 perf: reduce allocations handling terms (#8116)
• d80ffc4 website: Show playground errors
• 7e1c361 oracle: Use typed targets for specific matchers (#8138)
• 629cbd8 String interpolation docs (#8129)
• 9c52121 ast/parser: avoid allocating slices for variadic options
• Additional commits viewable in compare view

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