Check for Empty Flare Base Url and Catch Invalid URI Errors

feasibility-dsf-process/src/main/java/de/medizininformatik_initiative/feasibility_dsf_process/client/flare/FlareWebserviceClientSpringConfig.java

@@ -27,12 +27,15 @@
 
 import java.io.IOException;
 import java.net.URI;
+import java.net.URISyntaxException;
 
 import javax.net.ssl.SSLContext;
 
 import static ca.uhn.fhir.rest.api.Constants.HEADER_AUTHORIZATION;
 import static ca.uhn.fhir.rest.api.Constants.HEADER_AUTHORIZATION_VALPREFIX_BEARER;
+import static com.google.common.base.Preconditions.checkArgument;
 import static com.google.common.base.Strings.isNullOrEmpty;
+import static java.lang.String.format;
 
 @Configuration
 @Import(BaseConfig.class)
@@ -67,7 +70,13 @@ public class FlareWebserviceClientSpringConfig {
 
     @Bean
     public FlareWebserviceClient flareWebserviceClient(HttpClient httpClient) {
-        return new FlareWebserviceClientImpl(httpClient, URI.create(flareBaseUrl));
+        checkArgument(!isNullOrEmpty(flareBaseUrl), "FLARE_BASE_URL is not set.");
+        try {
+            URI parsedFlareBaseUrl = new URI(flareBaseUrl);
+            return new FlareWebserviceClientImpl(httpClient, parsedFlareBaseUrl);
+        } catch (URISyntaxException e) {
+            throw new IllegalArgumentException(format("Could not parse FLARE_BASE_URL '%s' as URI.", flareBaseUrl), e);
+        }
     }
 
     @Bean
@@ -97,32 +106,32 @@ public HttpClient flareHttpClient(@Qualifier("base-client") SSLContext sslContex
 
     private final class BearerHttpClient extends CloseableHttpClient {
         private CloseableHttpClient client;
-    
+
         public BearerHttpClient(CloseableHttpClient client) {
             this.client = client;
         }
-    
+
         @Override
         public HttpParams getParams() {
             return client.getParams();
         }
-    
+
         @Override
         public ClientConnectionManager getConnectionManager() {
             return client.getConnectionManager();
         }
-    
+
         @Override
         public void close() throws IOException {
             client.close();
         }
-    
+
         @Override
         protected CloseableHttpResponse doExecute(HttpHost target, HttpRequest request, HttpContext context)
                 throws IOException, ClientProtocolException {
             return client.execute(target, request, context);
         }
-    
+
         @Override
         public <T> T execute(HttpUriRequest request, ResponseHandler<? extends T> responseHandler)
                 throws IOException, ClientProtocolException {

feasibility-dsf-process/src/test/java/de/medizininformatik_initiative/feasibility_dsf_process/client/flare/FlareWebserviceClientImplTest.java

@@ -9,6 +9,7 @@
 import org.mockito.ArgumentCaptor;
 import org.mockito.Captor;
 import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.test.util.ReflectionTestUtils;
 
 import java.io.IOException;
 import java.net.URI;
@@ -65,7 +66,7 @@ public void testRequestFeasibility() throws IOException, InterruptedException {
     }
 
     @Test
-    public void testName() throws Exception {
+    public void testBaseUrlPathIsKept() throws Exception {
         String path = "/foo/bar/";
         flareWebserviceClient = new FlareWebserviceClientImpl(httpClient, URI.create("http://foo.bar:1234" + path));
         var structuredQuery = "foo".getBytes();
@@ -77,4 +78,26 @@ public void testName() throws Exception {
 
         assertEquals(path + "query/execute", postCaptor.getValue().getURI().getPath());
     }
+
+    @Test
+    void testNullBaseUrlFails() throws Exception {
+        FlareWebserviceClientSpringConfig config = new FlareWebserviceClientSpringConfig();
+
+        IllegalArgumentException e = assertThrows(IllegalArgumentException.class,
+                () -> config.flareWebserviceClient(httpClient));
+
+        assertEquals("FLARE_BASE_URL is not set.", e.getMessage());
+    }
+
+    @Test
+    void testIllegalBaseUrlFails() throws Exception {
+        FlareWebserviceClientSpringConfig config = new FlareWebserviceClientSpringConfig();
+        String invalidUrl = "{ßöäü;";
+        ReflectionTestUtils.setField(config, "flareBaseUrl", invalidUrl);
+
+        IllegalArgumentException e = assertThrows(IllegalArgumentException.class,
+                () -> config.flareWebserviceClient(httpClient));
+
+        assertEquals("Could not parse FLARE_BASE_URL '" + invalidUrl + "' as URI.", e.getMessage());
+    }
 }