fix(acm): keep the Export option on RequestCertificate

RequestCertificate always stored Export as DISABLED, so an exportable public
certificate could never be exported. Read Export and the transparency logging
preference the way UpdateCertificateOptions does, rejecting values other than
ENABLED and DISABLED.

src/main/java/io/github/hectorvent/floci/services/acm/AcmJsonHandler.java

@@ -563,8 +563,10 @@ public class AcmJsonHandler {
 
     private CertificateOptions parseOptions(JsonNode optionsNode) {
         if (optionsNode.isMissingNode()) return null;
-        String ctPref = optionsNode.path("CertificateTransparencyLoggingPreference").asText("ENABLED");
-        return new CertificateOptions(ctPref, "DISABLED");
+        String ctPref = parseOptionValue(optionsNode, "CertificateTransparencyLoggingPreference");
+        String export = parseOptionValue(optionsNode, "Export");
+        // An exportable public certificate is requested with Export ENABLED, and keeps it for life.
+        return new CertificateOptions(ctPref != null ? ctPref : "ENABLED", export != null ? export : "DISABLED");
     }
 
     private List<CertificateStatus> parseCertificateStatuses(JsonNode node) {

src/test/java/io/github/hectorvent/floci/services/acm/AcmExportableRequestTest.java

@@ -0,0 +1,70 @@
+package io.github.hectorvent.floci.services.acm;
+
+import io.github.hectorvent.floci.testing.RestAssuredJsonUtils;
+import io.quarkus.test.junit.QuarkusTest;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.Test;
+
+import static io.restassured.RestAssured.given;
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.notNullValue;
+
+@QuarkusTest
+class AcmExportableRequestTest {
+
+    private static final String ACM_CONTENT_TYPE = "application/x-amz-json-1.1";
+
+    @BeforeAll
+    static void configureRestAssured() {
+        RestAssuredJsonUtils.configureAwsContentTypes();
+    }
+
+    @Test
+    void requestCertificateKeepsTheExportOption() {
+        String exportable = request("{\"DomainName\":\"exportable.example.com\",\"Options\":{\"Export\":\"ENABLED\"}}");
+
+        call("DescribeCertificate", "{\"CertificateArn\":\"" + exportable + "\"}")
+            .statusCode(200)
+            .body("Certificate.Options.Export", equalTo("ENABLED"))
+            .body("Certificate.Options.CertificateTransparencyLoggingPreference", equalTo("ENABLED"));
+
+        call("ExportCertificate", "{\"CertificateArn\":\"" + exportable + "\",\"Passphrase\":\"c2VjcmV0\"}")
+            .statusCode(200)
+            .body("PrivateKey", notNullValue());
+    }
+
+    @Test
+    void requestCertificateWithoutExportIsNotExportable() {
+        String plain = request("{\"DomainName\":\"plain.example.com\",\"Options\":{\"CertificateTransparencyLoggingPreference\":\"DISABLED\"}}");
+
+        call("DescribeCertificate", "{\"CertificateArn\":\"" + plain + "\"}")
+            .statusCode(200)
+            .body("Certificate.Options.Export", equalTo("DISABLED"))
+            .body("Certificate.Options.CertificateTransparencyLoggingPreference", equalTo("DISABLED"));
+
+        call("ExportCertificate", "{\"CertificateArn\":\"" + plain + "\",\"Passphrase\":\"c2VjcmV0\"}")
+            .statusCode(400)
+            .body("__type", equalTo("ValidationException"));
+    }
+
+    @Test
+    void requestCertificateRejectsAnUnknownExportValue() {
+        call("RequestCertificate", "{\"DomainName\":\"bad.example.com\",\"Options\":{\"Export\":\"MAYBE\"}}")
+            .statusCode(400)
+            .body("__type", equalTo("ValidationException"));
+    }
+
+    private String request(String body) {
+        return call("RequestCertificate", body).statusCode(200).extract().jsonPath().getString("CertificateArn");
+    }
+
+    private io.restassured.response.ValidatableResponse call(String action, String body) {
+        return given()
+            .header("X-Amz-Target", "CertificateManager." + action)
+            .contentType(ACM_CONTENT_TYPE)
+            .body(body)
+        .when()
+            .post("/")
+        .then();
+    }
+}