= CORS Extension

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This extension configures specified CORS headers for the endpoints exposed by the xref:vro:ROOT:about.adoc[].

To learn more about CORS, see for example link:https://www.moesif.com/blog/technical/cors/Authoritative-Guide-to-CORS-Cross-Origin-Resource-Sharing-for-REST-APIs/#how-is-origin-definedhttps://www.moesif.com/blog/technical/cors/Authoritative-Guide-to-CORS-Cross-Origin-Resource-Sharing-for-REST-APIs/#how-is-origin-defined[this blog post at www.moesif.com]


== Setup

=== Dependency Management

In your application's top level `pom.xml`, add a dependency for this module's own bill of materials (BOM):

[source,xml,subs="attributes+"]
.pom.xml
----
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.apache.causeway.extensions</groupId>
            <artifactId>causeway-extensions-cors</artifactId>
            <scope>import</scope>
            <type>pom</type>
            <version>{page-causewayprevv3}</version>
        </dependency>
    </dependencies>
</dependencyManagement>
----


=== Dependencies / Imports

In the webapp module of your application, add the following dependency:

[source,xml]
.pom.xml
----
<dependency>
    <groupId>org.apache.causeway.extensions</groupId>
    <artifactId>causeway-extensions-cors-impl</artifactId>
</dependency>
----

In your application's xref:userguide::modules.adoc#appmanifest[App Manifest], import the extension's implementation module:

[source,java]
.AppManifest.java
----
@Configuration
@Import({
        CausewayModuleExtCors.class,
        ...
})
public class AppManifest {
}
----


== Configuration

Update the configuration properties:

[source,yml]
.application.yml
----
causeway:
    extensions:
        cors:
            allow-credentials: ...  # <.>
            allow-headers: ...      # <.>
            allow-methods: ...      # <.>
            allow-origins: ...      # <.>
            exposed-headers: ...    # <.>
----
<.> xref:refguide:config:sections/causeway.extensions.adoc#causeway.extensions.cors.allow-credentials[causeway.extensions.cors.allow-credentials]
<.> xref:refguide:config:sections/causeway.extensions.adoc#causeway.extensions.cors.allowed-headers[causeway.extensions.cors.allow-headers]
<.> xref:refguide:config:sections/causeway.extensions.adoc#causeway.extensions.cors.allowed-methods[causeway.extensions.cors.allow-methods]
<.> xref:refguide:config:sections/causeway.extensions.adoc#causeway.extensions.cors.allowed-origins[causeway.extensions.cors.allow-origins]
<.> xref:refguide:config:sections/causeway.extensions.adoc#causeway.extensions.cors.exposed-headers[causeway.extensions.cors.exposed-headers]
