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Vert.x HTTP
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package io.quarkus.vertx.http.runtime;

import io.quarkus.runtime.LaunchMode;
import io.quarkus.runtime.configuration.ConfigBuilder;
import io.smallrye.config.SmallRyeConfigBuilder;

public class VertxConfigBuilder implements ConfigBuilder {
    private static final String QUARKUS_HTTP_HOST = "quarkus.http.host";

    private static final String LOCALHOST = "localhost";
    private static final String ALL_INTERFACES = "0.0.0.0";

    @Override
    public SmallRyeConfigBuilder configBuilder(final SmallRyeConfigBuilder builder) {
        // It may have been recorded, so only set if it not available in the defaults
        if (builder.getDefaultValues().get(QUARKUS_HTTP_HOST) == null) {
            // Sets the default host config value, depending on the launch mode
            if (LaunchMode.isRemoteDev()) {
                // in remote dev mode, we want to listen on all interfaces
                // to make sure the application is accessible
                builder.withDefaultValue(QUARKUS_HTTP_HOST, ALL_INTERFACES);
            } else if (LaunchMode.current().isDevOrTest()) {
                if (!isWSL()) {
                    // in dev mode, we want to listen only on localhost
                    // to make sure the app is not accessible from the outside
                    builder.withDefaultValue(QUARKUS_HTTP_HOST, LOCALHOST);
                } else {
                    // except when using WSL, as otherwise the app wouldn't be accessible from the host
                    builder.withDefaultValue(QUARKUS_HTTP_HOST, ALL_INTERFACES);
                }
            } else {
                // in all the other cases, we make sure the app is accessible on all the interfaces by default
                builder.withDefaultValue(QUARKUS_HTTP_HOST, ALL_INTERFACES);
            }
        }
        return builder;
    }

    /**
     * @return {@code true} if the application is running in a WSL (Windows Subsystem for Linux) environment
     */
    private boolean isWSL() {
        var sysEnv = System.getenv();
        return sysEnv.containsKey("IS_WSL") || sysEnv.containsKey("WSL_DISTRO_NAME");
    }
}