Make the app id and private key optional in tests

Fixes #280

deployment/src/test/java/io/quarkiverse/githubapp/deployment/replay/ReplayEventRouteAvailableInDevModeTest.java

@@ -13,7 +13,7 @@ public class ReplayEventRouteAvailableInDevModeTest {
     @RegisterExtension
     public static final QuarkusDevModeTest test = new QuarkusDevModeTest()
             .setArchiveProducer(() -> ShrinkWrap.create(JavaArchive.class)
-                    .addAsResource("application.properties"));
+                    .addAsResource("application-for-dev.properties", "application.properties"));
 
     @Test
     public void testPayloadSignatureCheck() {

deployment/src/test/java/io/quarkiverse/githubapp/deployment/signing/PayloadSignatureCheckerTest.java

@@ -22,7 +22,8 @@ public class PayloadSignatureCheckerTest {
             .setArchiveProducer(() -> ShrinkWrap.create(JavaArchive.class)
                     .addClass(PayloadUtil.class)
                     .addAsResource(PAYLOAD))
-            .withConfigurationResource("application.properties");
+            .withConfigurationResource("application.properties")
+            .overrideConfigKey("quarkus.github-app.webhook-secret", "cs5WKyOlY6go0E1RbkAOf0jq5K4KWBcP");
 
     @Inject
     PayloadSignatureChecker payloadSignatureChecker;

deployment/src/test/resources/application-for-dev.properties

@@ -0,0 +1,31 @@
+# Don't name this file application-dev.properties or it will get picked up
+# for every single test, including those that don't reference this file...
+quarkus.github-app.app-id=1234
+quarkus.github-app.app-name=quarkus-github-app-test
+quarkus.github-app.private-key=-----BEGIN RSA PRIVATE KEY-----\
+MIIEowIBAAKCAQEAtsCKYkMzgqSsbkcPThTjeYnd6r5RAS4q5SyiOyIf34nYH5D0\
+jy8Dlt1s8u69KmBoM9Neesqf2Yh80b/UNUtea9knpgR4ME+MIg1LdsLnUWoZuPBl\
+lLaMfwRkN4+ZbTJ7Uo98UUlxoTcCjZVzopSoIazuUF5u+01sx6QEcHB312s42FVL\
+gkd8T36wvIywseOPKr2oyCMQ2AdcxL/cEHwx2hcQAe+eTipsxNy4atIhbDWrML5W\
+v7cYlyn9/sKgxkXtW3eInP3VI3FS+IH+cjwO4FS6ez8TT6USfaCjDb4LgdEKt/de\
+Ds4TbqwM2vjqedLNBhE7t4V2Uf3STdFq+cKHwwIDAQABAoIBAE07MUA1hh8/2F8C\
+SMWGrls+mDoME8+b4yTWp/i1gyLE7kDo0XFxPOMU0GYZ3nd6Jo9AVD0wRD16IMXD\
+e7rKDy0kqEzQtroz49TAKZQW6grN+/DcJxGh094ZzQBt/zjWjKdnW/I+R3cJ+Fo9\
+PpEGoccZfd0ZC23IWqBEAFxEK2Eth7CbJW5eMJElyqSZa9jiF6wdnryH4Xww38iE\
+zv5tL2Ieg03lxj0mdeyzFyIzJTk3PEAFLIjIiducIhSWyJHltpKQEZ3iFMzKfx7l\
+qLIczsyLRouc64+T7lW1PO6SQshHlvc6CtJaHHf98iFMDwdDlSolF/PfNLE5C6lA\
+U0KGUYECgYEA5xcnO9nv58QdcMXobHWethh+a2QTWmEXbE/Lnunqgq+bTgJUbgXR\
+Fi+awb+6GI8lJh16oBbzSRGe2pFQcQa9S84+CnAyVVyras4WC5bcl38q46wh0IRW\
+2sqvJfAI/CJZxgLVceELJ4hn9t8/7Ucoh6ZYYSsVnwtvvrmzMsC1z/0CgYEAynOC\
+v0O+FC5MI+p6HQXdK8JWNecIMEoat5RpmF6nvYSRmHliggoeAV5Of7b6Y0JBRgGm\
++wECWCKMfaJ1BdCOncci+YkLguSBeJGbDkr65En/zzPxtuvYqcg05x50RWdbLQ5N\
+PF6FHSC8FILpfpJ5f/W8rfNNmU4eTKS4DxUr4r8CgYEA4vfqoO48ovYLtGetEFm1\
+uEP2ZqO0HmCeENOOulYk7pZrgwLmyekMoy2+Ye1daiGt6vGpLvNbn7ievS1cRKbJ\
+5Vp7tOTditmpww0GuftCTcmo5lR6IcLZS6smu6w2Ju3WHpVJ7r+JpRpkgiRjNTle\
+pVzMESOv6LXi2wCo8IA2EkECgYAOyzQRr+yS4vMzaK31svj/epr8I17I0JF1OsYg\
+mUIeqjJNdwlIwV6B8RdBY+iWGkBU0kgWbXNzZ0rm31k3zI6vXt7iZy5NKU+AtPsk\
+pzwANJwZ0wzltgRGG9gpz2Lls3DJMRNZxvppL3wu74YKdr+kJxvbhjz0Z+304dCF\
+YaGsVwKBgA6KSf1pPD93W/v5tV0WnhBZGKb3sX34JLQoCJPS5w6nTjHnuwpP9g0K\
+C8HXKULXuX/rb/gz99PNcPQ9GqB0Rw/ho1KhO3VLJjBiSh/hiASKuFGs2y59UXYt\
+mvqX3jAqi6ksGD5WPG6G2CdL/n30e5/lc10hq7SiwV7z9njW/8Pu\
+-----END RSA PRIVATE KEY-----

deployment/src/test/resources/application.properties

@@ -1,30 +1 @@
-quarkus.github-app.app-id=88937
-quarkus.github-app.app-name=quarkus-github-app-test
-quarkus.github-app.webhook-secret=cs5WKyOlY6go0E1RbkAOf0jq5K4KWBcP
-quarkus.github-app.private-key=-----BEGIN RSA PRIVATE KEY-----\
-MIIEowIBAAKCAQEAtsCKYkMzgqSsbkcPThTjeYnd6r5RAS4q5SyiOyIf34nYH5D0\
-jy8Dlt1s8u69KmBoM9Neesqf2Yh80b/UNUtea9knpgR4ME+MIg1LdsLnUWoZuPBl\
-lLaMfwRkN4+ZbTJ7Uo98UUlxoTcCjZVzopSoIazuUF5u+01sx6QEcHB312s42FVL\
-gkd8T36wvIywseOPKr2oyCMQ2AdcxL/cEHwx2hcQAe+eTipsxNy4atIhbDWrML5W\
-v7cYlyn9/sKgxkXtW3eInP3VI3FS+IH+cjwO4FS6ez8TT6USfaCjDb4LgdEKt/de\
-Ds4TbqwM2vjqedLNBhE7t4V2Uf3STdFq+cKHwwIDAQABAoIBAE07MUA1hh8/2F8C\
-SMWGrls+mDoME8+b4yTWp/i1gyLE7kDo0XFxPOMU0GYZ3nd6Jo9AVD0wRD16IMXD\
-e7rKDy0kqEzQtroz49TAKZQW6grN+/DcJxGh094ZzQBt/zjWjKdnW/I+R3cJ+Fo9\
-PpEGoccZfd0ZC23IWqBEAFxEK2Eth7CbJW5eMJElyqSZa9jiF6wdnryH4Xww38iE\
-zv5tL2Ieg03lxj0mdeyzFyIzJTk3PEAFLIjIiducIhSWyJHltpKQEZ3iFMzKfx7l\
-qLIczsyLRouc64+T7lW1PO6SQshHlvc6CtJaHHf98iFMDwdDlSolF/PfNLE5C6lA\
-U0KGUYECgYEA5xcnO9nv58QdcMXobHWethh+a2QTWmEXbE/Lnunqgq+bTgJUbgXR\
-Fi+awb+6GI8lJh16oBbzSRGe2pFQcQa9S84+CnAyVVyras4WC5bcl38q46wh0IRW\
-2sqvJfAI/CJZxgLVceELJ4hn9t8/7Ucoh6ZYYSsVnwtvvrmzMsC1z/0CgYEAynOC\
-v0O+FC5MI+p6HQXdK8JWNecIMEoat5RpmF6nvYSRmHliggoeAV5Of7b6Y0JBRgGm\
-+wECWCKMfaJ1BdCOncci+YkLguSBeJGbDkr65En/zzPxtuvYqcg05x50RWdbLQ5N\
-PF6FHSC8FILpfpJ5f/W8rfNNmU4eTKS4DxUr4r8CgYEA4vfqoO48ovYLtGetEFm1\
-uEP2ZqO0HmCeENOOulYk7pZrgwLmyekMoy2+Ye1daiGt6vGpLvNbn7ievS1cRKbJ\
-5Vp7tOTditmpww0GuftCTcmo5lR6IcLZS6smu6w2Ju3WHpVJ7r+JpRpkgiRjNTle\
-pVzMESOv6LXi2wCo8IA2EkECgYAOyzQRr+yS4vMzaK31svj/epr8I17I0JF1OsYg\
-mUIeqjJNdwlIwV6B8RdBY+iWGkBU0kgWbXNzZ0rm31k3zI6vXt7iZy5NKU+AtPsk\
-pzwANJwZ0wzltgRGG9gpz2Lls3DJMRNZxvppL3wu74YKdr+kJxvbhjz0Z+304dCF\
-YaGsVwKBgA6KSf1pPD93W/v5tV0WnhBZGKb3sX34JLQoCJPS5w6nTjHnuwpP9g0K\
-C8HXKULXuX/rb/gz99PNcPQ9GqB0Rw/ho1KhO3VLJjBiSh/hiASKuFGs2y59UXYt\
-mvqX3jAqi6ksGD5WPG6G2CdL/n30e5/lc10hq7SiwV7z9njW/8Pu\
------END RSA PRIVATE KEY-----
+quarkus.github-app.app-name=quarkus-github-app-test

docs/modules/ROOT/pages/includes/quarkus-github-app.adoc

@@ -14,11 +14,12 @@ a| [[quarkus-github-app_quarkus.github-app.app-id]]`link:#quarkus-github-app_qua
 
 [.description]
 --
-The numeric application id provided by GitHub.
+The numeric application id provided by GitHub. 
+ Optional for tests, but mandatory in production and dev mode.
 
 Environment variable: `+++QUARKUS_GITHUB_APP_APP_ID+++`
 --|string 
-|required icon:exclamation-circle[title=Configuration property is required]
+|
 
 
 a| [[quarkus-github-app_quarkus.github-app.app-name]]`link:#quarkus-github-app_quarkus.github-app.app-name[quarkus.github-app.app-name]`
@@ -48,12 +49,13 @@ a| [[quarkus-github-app_quarkus.github-app.private-key]]`link:#quarkus-github-ap
 
 [.description]
 --
-The RSA private key.
+The RSA private key. 
+ Optional for tests, but mandatory in production and dev mode.
 
 Environment variable: `+++QUARKUS_GITHUB_APP_PRIVATE_KEY+++`
 --|link:https://docs.oracle.com/javase/8/docs/api/java/security/PrivateKey.html[PrivateKey]
 
-|required icon:exclamation-circle[title=Configuration property is required]
+|
 
 
 a| [[quarkus-github-app_quarkus.github-app.webhook-secret]]`link:#quarkus-github-app_quarkus.github-app.webhook-secret[quarkus.github-app.webhook-secret]`

docs/modules/ROOT/pages/testing.adoc

@@ -37,42 +37,6 @@ Add the following dependency to your `deployment` module:
 </dependency>
 ----
 
-== Configure the application for tests
-
-Add a fake application ID and private key to your `application.properties`, just for tests:
-
-[source,properties]
-------
-%test.quarkus.github-app.app-id=0
-%test.quarkus.github-app.private-key=-----BEGIN RSA PRIVATE KEY-----\
-MIIEogIBAAKCAQEA30YvyuZAd+kGDT0nm/XAa93CqsDvC/iYOc4KsKsfBQs1MWjH\
-royuVDfQj2fJvueFnOgZApM3viaCz188D/j3tUMNByIKOfMLiEm/R1tqe7Q6xRRn\
-uwpfT+wv+/x4cNvPxTscwo43LVR9Pno71UfZZywnYN03GS71ttNCiiBKXwCSnHez\
-/t79iAmMnym7ViNsKzA0aS5EwAw9A3GeTnxpRef0y0vDNE2aXBNCe+f1ZnFq1Fhe\
-PJIlKs/qlM136A2co+WRaPghacZJMuwQr1vajuMSBjMEroIPOfSG3x3Oitvnukjp\
-EwuhXjmZeaLc+60rYaMRwf+bje8KmaAVOMWkHQIDAQABAoIBAA+d8SnYARpiCjJS\
-3Lpj7hmdYUhgRlgoAz3H06eX0IuhxQ63rX/gBzGM1eGx+MKJnybidR1g/r0mJHAs\
-0R6s42aiUf71upFjFqNpxR9QnZoZeSLf0oGasB/+/Tw65JHATkAVamWRXPqmtjvw\
-gM7iP6qfxAFad8gjKLyo+jZ/G7SZTCMwnp+sRynirNpycxaAn/xK6Pe43+nyQVWT\
-E0J8bvCzrFD47CM5zZaBQlLWTMjY4Rr3U6BMTGwQWJzGkeGn+2JsHVUch0k7+NRa\
-e3FKjT+57dZqQTnGPVSpBFWEXVO9KLEuLBLyRx0348TZBHzIM9IigN4QS2AaWTJw\
-1kp3VWECgYEA/3P/nsL+RL/yqYvENZ7XqEkXRNH6YHOe8h/lFoYHStCl9y0T8O+z\
-ooJq9hEq7QcYs2bHvBWj8B9he7+bZ5ZOMAM6oIgrgB5FzSvL7JzXhEdONxe/j2TI\
-GbQuC+NxdJtx4Y6yF9Lrb1UyKX+HzR4de+v6b5hER7x8x4gQn1sCYmsCgYEA38CN\
-bTtE3RKY98m33a1Cd6hNXHSyy5GOK5/XGDn0XoGfFe5YJnnh2lia2V4xqUH9d1Mu\
-bB0bEUhfbac5SX5SIW+NBVxzehqfMkrZj/rzN8Wd7TrYAHSldSMhkPTuwuuzfnHL\
-sJLe2gyoqq+sooeE7eCH2fpPIN0wg5U+jc60hZcCgYBHtmrGSPtUlYYr7p6wZt0n\
-0w0DNudQ+GRgmG+ZeRrG9/f/gdodQ01si6w3U+53CAz5IBtmQ7T4Dfcx5EJePCXK\
-+L0Wn+OGXfk+ddMTo5wk+FeOw831FVfPT3O1xq3tDE5WAdchNQb/BC3G1JRtEs04\
-IrD1bwuMD+//m8T+12+97QKBgDko0XhEGdV3+MfkKiphJoe24Pxre3lxl6YhUSuJ\
-Mpop9t/9YVuC62WCGRzKaVlZ2ExxXXyU+uMxX999Rq81q/mKq7Xg5kcdIeoRIP8d\
-FqD6xNtjmuaS5enErcCAMbZtzA7TNzvGaVO+xB/GfQ2QHS8/mrTesvQsTUZwC+ji\
-E0/FAoGATJvuAfgy9uiKR7za7MigYVacE0u4aD1sF7v6D4AFqBOGquPQQhePSdz9\
-G/UUwySoo+AQ+rd2EPhyexjqXBhRGe+EDGFVFivaQzTT8/5bt/VddbTcw2IpmXYj\
-LW6V8BbcP5MRhd2JQSRh16nWwSQJ2BdpUZFwayEEQ6UcrMfqvA0=\
------END RSA PRIVATE KEY-----
-------
-
 == Add event payloads to the test resources
 
 When you <<manual-vs-automated,tested your application manually>>,

integration-tests/testing-framework/src/main/resources/application.properties

@@ -1,30 +1 @@
-quarkus.application.name=testing-framework-test-app
-
-%test.quarkus.github-app.app-id=0
-%test.quarkus.github-app.private-key=-----BEGIN RSA PRIVATE KEY-----\
-MIIEogIBAAKCAQEA30YvyuZAd+kGDT0nm/XAa93CqsDvC/iYOc4KsKsfBQs1MWjH\
-royuVDfQj2fJvueFnOgZApM3viaCz188D/j3tUMNByIKOfMLiEm/R1tqe7Q6xRRn\
-uwpfT+wv+/x4cNvPxTscwo43LVR9Pno71UfZZywnYN03GS71ttNCiiBKXwCSnHez\
-/t79iAmMnym7ViNsKzA0aS5EwAw9A3GeTnxpRef0y0vDNE2aXBNCe+f1ZnFq1Fhe\
-PJIlKs/qlM136A2co+WRaPghacZJMuwQr1vajuMSBjMEroIPOfSG3x3Oitvnukjp\
-EwuhXjmZeaLc+60rYaMRwf+bje8KmaAVOMWkHQIDAQABAoIBAA+d8SnYARpiCjJS\
-3Lpj7hmdYUhgRlgoAz3H06eX0IuhxQ63rX/gBzGM1eGx+MKJnybidR1g/r0mJHAs\
-0R6s42aiUf71upFjFqNpxR9QnZoZeSLf0oGasB/+/Tw65JHATkAVamWRXPqmtjvw\
-gM7iP6qfxAFad8gjKLyo+jZ/G7SZTCMwnp+sRynirNpycxaAn/xK6Pe43+nyQVWT\
-E0J8bvCzrFD47CM5zZaBQlLWTMjY4Rr3U6BMTGwQWJzGkeGn+2JsHVUch0k7+NRa\
-e3FKjT+57dZqQTnGPVSpBFWEXVO9KLEuLBLyRx0348TZBHzIM9IigN4QS2AaWTJw\
-1kp3VWECgYEA/3P/nsL+RL/yqYvENZ7XqEkXRNH6YHOe8h/lFoYHStCl9y0T8O+z\
-ooJq9hEq7QcYs2bHvBWj8B9he7+bZ5ZOMAM6oIgrgB5FzSvL7JzXhEdONxe/j2TI\
-GbQuC+NxdJtx4Y6yF9Lrb1UyKX+HzR4de+v6b5hER7x8x4gQn1sCYmsCgYEA38CN\
-bTtE3RKY98m33a1Cd6hNXHSyy5GOK5/XGDn0XoGfFe5YJnnh2lia2V4xqUH9d1Mu\
-bB0bEUhfbac5SX5SIW+NBVxzehqfMkrZj/rzN8Wd7TrYAHSldSMhkPTuwuuzfnHL\
-sJLe2gyoqq+sooeE7eCH2fpPIN0wg5U+jc60hZcCgYBHtmrGSPtUlYYr7p6wZt0n\
-0w0DNudQ+GRgmG+ZeRrG9/f/gdodQ01si6w3U+53CAz5IBtmQ7T4Dfcx5EJePCXK\
-+L0Wn+OGXfk+ddMTo5wk+FeOw831FVfPT3O1xq3tDE5WAdchNQb/BC3G1JRtEs04\
-IrD1bwuMD+//m8T+12+97QKBgDko0XhEGdV3+MfkKiphJoe24Pxre3lxl6YhUSuJ\
-Mpop9t/9YVuC62WCGRzKaVlZ2ExxXXyU+uMxX999Rq81q/mKq7Xg5kcdIeoRIP8d\
-FqD6xNtjmuaS5enErcCAMbZtzA7TNzvGaVO+xB/GfQ2QHS8/mrTesvQsTUZwC+ji\
-E0/FAoGATJvuAfgy9uiKR7za7MigYVacE0u4aD1sF7v6D4AFqBOGquPQQhePSdz9\
-G/UUwySoo+AQ+rd2EPhyexjqXBhRGe+EDGFVFivaQzTT8/5bt/VddbTcw2IpmXYj\
-LW6V8BbcP5MRhd2JQSRh16nWwSQJ2BdpUZFwayEEQ6UcrMfqvA0=\
------END RSA PRIVATE KEY-----
+quarkus.application.name=testing-framework-test-app

runtime/src/main/java/io/quarkiverse/githubapp/runtime/config/GitHubAppRuntimeConfig.java

@@ -15,9 +15,11 @@ public class GitHubAppRuntimeConfig {
 
     /**
      * The numeric application id provided by GitHub.
+     * <p>
+     * Optional for tests, but mandatory in production and dev mode.
      */
     @ConfigItem
-    public String appId;
+    public Optional<String> appId;
 
     /**
      * The GitHub name of the application.
@@ -35,10 +37,12 @@ public class GitHubAppRuntimeConfig {
 
     /**
      * The RSA private key.
+     * <p>
+     * Optional for tests, but mandatory in production and dev mode.
      */
     @ConfigItem
     @ConvertWith(PrivateKeyConverter.class)
-    public PrivateKey privateKey;
+    public Optional<PrivateKey> privateKey;
 
     /**
      * The webhook secret if defined in the GitHub UI.

runtime/src/main/java/io/quarkiverse/githubapp/runtime/github/GitHubService.java

@@ -2,11 +2,15 @@
 
 import java.io.IOException;
 import java.security.GeneralSecurityException;
+import java.security.PrivateKey;
 import java.time.temporal.ChronoUnit;
+import java.util.HashSet;
+import java.util.Set;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.TimeUnit;
 
 import javax.enterprise.context.ApplicationScoped;
+import javax.enterprise.event.Observes;
 import javax.inject.Inject;
 
 import org.kohsuke.github.GHAppInstallationToken;
@@ -21,6 +25,9 @@
 import io.quarkiverse.githubapp.GitHubClientProvider;
 import io.quarkiverse.githubapp.runtime.config.GitHubAppRuntimeConfig;
 import io.quarkiverse.githubapp.runtime.signing.JwtTokenCreator;
+import io.quarkus.runtime.LaunchMode;
+import io.quarkus.runtime.StartupEvent;
+import io.quarkus.runtime.configuration.ConfigurationException;
 import io.smallrye.graphql.client.dynamic.api.DynamicGraphQLClient;
 import io.smallrye.graphql.client.dynamic.api.DynamicGraphQLClientBuilder;
 
@@ -32,14 +39,17 @@ public class GitHubService implements GitHubClientProvider {
 
     private final GitHubAppRuntimeConfig gitHubAppRuntimeConfig;
 
-    private final JwtTokenCreator jwtTokenCreator;
+    private final JwtTokenProvider jwtTokenProvider;
 
     private final LoadingCache<Long, CachedInstallationToken> installationTokenCache;
 
+    @Inject
+    LaunchMode launchMode;
+
     @Inject
     public GitHubService(GitHubAppRuntimeConfig gitHubAppRuntimeConfig, JwtTokenCreator jwtTokenCreator) {
         this.gitHubAppRuntimeConfig = gitHubAppRuntimeConfig;
-        this.jwtTokenCreator = jwtTokenCreator;
+        this.jwtTokenProvider = new JwtTokenProvider(gitHubAppRuntimeConfig, jwtTokenCreator);
         this.installationTokenCache = Caffeine.newBuilder()
                 .maximumSize(50)
                 .expireAfter(new Expiry<Long, CachedInstallationToken>() {
@@ -69,6 +79,20 @@ public long expireAfterRead(Long installationId, CachedInstallationToken cachedI
                 .build(new CreateInstallationToken());
     }
 
+    public void init(@Observes StartupEvent startupEvent) throws IOException {
+        switch (launchMode) {
+            case TEST:
+                // If some client config is missing, we'll fail later, and only if tests attempt to retrieve the client.
+                break;
+            case NORMAL:
+            case DEVELOPMENT:
+            default:
+                // If some client config is missing, we'll fail on startup.
+                jwtTokenProvider.checkConfig();
+                break;
+        }
+    }
+
     @Override
     public GitHub getInstallationClient(long installationId) {
         try {
@@ -179,8 +203,7 @@ private GitHub createApplicationGitHub() {
         String jwtToken;
 
         try {
-            // maximum TTL is 10 minutes
-            jwtToken = jwtTokenCreator.createJwtToken(gitHubAppRuntimeConfig.appId, gitHubAppRuntimeConfig.privateKey, 540);
+            jwtToken = jwtTokenProvider.createJwtToken();
         } catch (GeneralSecurityException | IOException e) {
             throw new IllegalStateException("Unable to generate the JWT token", e);
         }
@@ -195,4 +218,45 @@ private GitHub createApplicationGitHub() {
             throw new IllegalStateException("Unable to create a GitHub client for the application", e);
         }
     }
+
+    private static class JwtTokenProvider {
+        private final String appId;
+        private final PrivateKey privateKey;
+        private final Set<String> missingPropertyKeys = new HashSet<>();
+        private final JwtTokenCreator jwtTokenCreator;
+
+        public JwtTokenProvider(GitHubAppRuntimeConfig gitHubAppRuntimeConfig, JwtTokenCreator jwtTokenCreator) {
+            this.jwtTokenCreator = jwtTokenCreator;
+            if (gitHubAppRuntimeConfig.appId.isPresent()) {
+                appId = gitHubAppRuntimeConfig.appId.get();
+            } else {
+                appId = null;
+                missingPropertyKeys.add("quarkus.github-app.app-id");
+            }
+            if (gitHubAppRuntimeConfig.privateKey.isPresent()) {
+                privateKey = gitHubAppRuntimeConfig.privateKey.get();
+            } else {
+                privateKey = null;
+                missingPropertyKeys.add("quarkus.github-app.private-key");
+            }
+        }
+
+        public String createJwtToken() throws GeneralSecurityException, IOException {
+            checkConfig();
+            // maximum TTL is 10 minutes
+            return jwtTokenCreator.createJwtToken(appId, privateKey, 540);
+        }
+
+        public void checkConfig() {
+            if (!missingPropertyKeys.isEmpty()) {
+                throw new ConfigurationException(
+                        "Missing value for configuration properties " + missingPropertyKeys + "."
+                                + " This configuration is necessary to create the GitHub clients."
+                                + " It is optional only in tests, if GitHub clients are being mocked using quarkus-github-app-testing"
+                                + " (see https://quarkiverse.github.io/quarkiverse-docs/quarkus-github-app/dev/testing.html).",
+                        missingPropertyKeys);
+            }
+        }
+
+    }
 }