SCANJLIB-245 Add support for redirects

lib/src/main/java/org/sonarsource/scanner/lib/internal/http/ScannerHttpClient.java

@@ -43,12 +43,12 @@ public class ScannerHttpClient {
   private static final String EXCEPTION_MESSAGE_MISSING_SLASH = "URL path must start with slash: %s";
 
 
-  private OkHttpClient httpClient;
+  private OkHttpClient sharedHttpClient;
   private HttpConfig httpConfig;
 
   public void init(HttpConfig httpConfig) {
     this.httpConfig = httpConfig;
-    this.httpClient = OkHttpClientFactory.create(httpConfig);
+    this.sharedHttpClient = OkHttpClientFactory.create(httpConfig);
   }
 
 
@@ -82,9 +82,6 @@ public void downloadFromExternalUrl(String url, Path toFile) throws IOException
    * @throws IllegalStateException if HTTP response code is different than 2xx
    */
   private void downloadFile(String url, Path toFile, boolean authentication) throws IOException {
-    if (httpClient == null) {
-      throw new IllegalStateException("ServerConnection must be initialized");
-    }
     LOG.debug("Download {} to {}", url, toFile.toAbsolutePath());
 
     try (ResponseBody responseBody = callUrl(url, authentication, "application/octet-stream");
@@ -120,9 +117,6 @@ public String callWebApi(String urlPath) throws IOException {
    * @throws IllegalStateException if HTTP response code is different than 2xx
    */
   private String callApi(String url) throws IOException {
-    if (httpClient == null) {
-      throw new IllegalStateException("ServerConnection must be initialized");
-    }
     try (ResponseBody responseBody = callUrl(url, true, null)) {
       return responseBody.string();
     }
@@ -137,21 +131,8 @@ private String callApi(String url) throws IOException {
    * @throws IllegalStateException if HTTP code is different than 2xx
    */
   private ResponseBody callUrl(String url, boolean authentication, @Nullable String acceptHeader) {
-    var requestBuilder = new Request.Builder()
-      .get()
-      .url(url)
-      .addHeader("User-Agent", httpConfig.getUserAgent());
-    if (authentication) {
-      if (httpConfig.getToken() != null) {
-        requestBuilder.header("Authorization", "Bearer " + httpConfig.getToken());
-      } else if (httpConfig.getLogin() != null) {
-        requestBuilder.header("Authorization", Credentials.basic(httpConfig.getLogin(), httpConfig.getPassword() != null ? httpConfig.getPassword() : ""));
-      }
-    }
-    if (acceptHeader != null) {
-      requestBuilder.header("Accept", acceptHeader);
-    }
-    Request request = requestBuilder.build();
+    var httpClient = buildHttpClient(authentication);
+    var request = prepareRequest(url, acceptHeader);
     Response response;
     try {
       response = httpClient.newCall(request).execute();
@@ -164,4 +145,37 @@ private ResponseBody callUrl(String url, boolean authentication, @Nullable Strin
     }
     return response.body();
   }
+
+  private Request prepareRequest(String url, @org.jetbrains.annotations.Nullable String acceptHeader) {
+    var requestBuilder = new Request.Builder()
+      .get()
+      .url(url)
+      .addHeader("User-Agent", httpConfig.getUserAgent());
+    if (acceptHeader != null) {
+      requestBuilder.header("Accept", acceptHeader);
+    }
+    return requestBuilder.build();
+  }
+
+  private OkHttpClient buildHttpClient(boolean authentication) {
+    if (authentication) {
+      return sharedHttpClient.newBuilder()
+        .addNetworkInterceptor(chain -> {
+          Request request = chain.request();
+          if (httpConfig.getToken() != null) {
+            request = request.newBuilder()
+              .header("Authorization", "Bearer " + httpConfig.getToken())
+              .build();
+          } else if (httpConfig.getLogin() != null) {
+            request = request.newBuilder()
+              .header("Authorization", Credentials.basic(httpConfig.getLogin(), httpConfig.getPassword() != null ? httpConfig.getPassword() : ""))
+              .build();
+          }
+          return chain.proceed(request);
+        })
+        .build();
+    } else {
+      return sharedHttpClient;
+    }
+  }
 }

lib/src/test/java/org/sonarsource/scanner/lib/internal/http/ScannerHttpClientTest.java

@@ -29,6 +29,8 @@
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.RegisterExtension;
 import org.junit.jupiter.api.io.TempDir;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
 import org.sonarsource.scanner.lib.ScannerProperties;
 import org.sonarsource.scanner.lib.internal.InternalProperties;
 
@@ -51,6 +53,11 @@ class ScannerHttpClientTest {
     .options(wireMockConfig().dynamicPort())
     .build();
 
+  @RegisterExtension
+  static WireMockExtension redirectProxy = WireMockExtension.newInstance()
+    .options(wireMockConfig().dynamicPort())
+    .build();
+
   @TempDir
   private Path sonarUserHome;
 
@@ -168,6 +175,28 @@ void downloadFromExternalUrl_shouldNotPassAuth(@TempDir Path tmpFolder) throws E
       .withoutHeader("Authorization"));
   }
 
+  @ParameterizedTest
+  @ValueSource(ints = {301, 302, 303, 307, 308})
+  void should_follow_redirects_and_preserve_authentication(int code) throws Exception {
+    Map<String, String> props = new HashMap<>();
+    props.put("sonar.login", "some_username");
+    props.put("sonar.password", "some_password");
+    ScannerHttpClient connection = create(redirectProxy.baseUrl(), props);
+
+    redirectProxy.stubFor(get("/batch/index.txt")
+      .willReturn(aResponse()
+        .withHeader("Location", sonarqube.baseUrl() + "/batch/index.txt")
+        .withStatus(code)));
+
+    answer(HELLO_WORLD);
+    String content = connection.callWebApi("/batch/index.txt");
+    assertThat(content).isEqualTo(HELLO_WORLD);
+
+    sonarqube.verify(getRequestedFor(anyUrl())
+      .withHeader("Authorization",
+        equalTo("Basic " + Base64.getEncoder().encodeToString("some_username:some_password".getBytes(StandardCharsets.UTF_8)))));
+  }
+
   private ScannerHttpClient create() {
     return create(sonarqube.baseUrl());
   }