[java] implement file downloads (#12979)

* [java] download file to disk without string return

* [java] implement options method to toggle downloads enabled

java/src/org/openqa/selenium/HasDownloads.java

@@ -0,0 +1,61 @@
+// Licensed to the Software Freedom Conservancy (SFC) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The SFC licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+package org.openqa.selenium;
+
+import java.io.IOException;
+import java.nio.file.Path;
+import java.util.List;
+
+/** Indicates that a driver supports downloading remote files. */
+public interface HasDownloads {
+
+  /**
+   * Requires downloads to be enabled.
+   *
+   * <p>TODO: Create an example in the documentation and provide a link to it.
+   *
+   * @param capabilities the capabilities object
+   * @throws WebDriverException if capability to enable downloads is not set
+   */
+  default void requireDownloadsEnabled(Capabilities capabilities) {
+    boolean downloadsEnabled = (boolean) capabilities.getCapability("se:downloadsEnabled");
+    if (!downloadsEnabled) {
+      throw new WebDriverException(
+          "You must enable downloads in order to work with downloadable files.");
+    }
+  }
+
+  /**
+   * Gets the downloadable files.
+   *
+   * @return a list of downloadable files for each key
+   */
+  List<String> getDownloadableFiles();
+
+  /**
+   * Downloads a file to a given location.
+   *
+   * @param fileName the name of the file to be downloaded
+   * @param targetLocation the location where the file will be downloaded to
+   * @throws IOException if an I/O error occurs while downloading the file
+   */
+  void downloadFile(String fileName, Path targetLocation) throws IOException;
+
+  /** Deletes the downloadable files. */
+  void deleteDownloadableFiles();
+}

java/src/org/openqa/selenium/remote/AbstractDriverOptions.java

@@ -19,6 +19,7 @@
 
 import static org.openqa.selenium.remote.CapabilityType.ACCEPT_INSECURE_CERTS;
 import static org.openqa.selenium.remote.CapabilityType.BROWSER_VERSION;
+import static org.openqa.selenium.remote.CapabilityType.ENABLE_DOWNLOADS;
 import static org.openqa.selenium.remote.CapabilityType.PAGE_LOAD_STRATEGY;
 import static org.openqa.selenium.remote.CapabilityType.PLATFORM_NAME;
 import static org.openqa.selenium.remote.CapabilityType.PROXY;
@@ -101,6 +102,11 @@ public DO setProxy(Proxy proxy) {
     return (DO) this;
   }
 
+  public DO setEnableDownloads(boolean enableDownloads) {
+    setCapability(ENABLE_DOWNLOADS, enableDownloads);
+    return (DO) this;
+  }
+
   @Override
   public Set<String> getCapabilityNames() {
     TreeSet<String> names = new TreeSet<>(super.getCapabilityNames());

java/src/org/openqa/selenium/remote/CapabilityType.java

@@ -30,4 +30,5 @@ public interface CapabilityType {
   String TIMEOUTS = "timeouts";
   String STRICT_FILE_INTERACTABILITY = "strictFileInteractability";
   String UNHANDLED_PROMPT_BEHAVIOUR = "unhandledPromptBehavior";
+  String ENABLE_DOWNLOADS = "se:downloadsEnabled";
 }

java/src/org/openqa/selenium/remote/DriverCommand.java

@@ -171,6 +171,9 @@ public interface DriverCommand {
   String GET_FEDCM_DIALOG_TYPE = "getFedCmDialogType";
   String SET_DELAY_ENABLED = "setDelayEnabled";
   String RESET_COOLDOWN = "resetCooldown";
+  String GET_DOWNLOADABLE_FILES = "getDownloadableFiles";
+  String DOWNLOAD_FILE = "downloadFile";
+  String DELETE_DOWNLOADABLE_FILES = "deleteDownloadableFiles";
 
   static CommandPayload NEW_SESSION(Capabilities capabilities) {
     Require.nonNull("Capabilities", capabilities);

java/src/org/openqa/selenium/remote/RemoteWebDriver.java

@@ -24,8 +24,10 @@
 
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableSet;
+import java.io.IOException;
 import java.net.MalformedURLException;
 import java.net.URL;
+import java.nio.file.Path;
 import java.time.Duration;
 import java.util.ArrayList;
 import java.util.Base64;
@@ -51,6 +53,7 @@
 import org.openqa.selenium.Cookie;
 import org.openqa.selenium.Dimension;
 import org.openqa.selenium.HasCapabilities;
+import org.openqa.selenium.HasDownloads;
 import org.openqa.selenium.ImmutableCapabilities;
 import org.openqa.selenium.JavascriptException;
 import org.openqa.selenium.JavascriptExecutor;
@@ -82,6 +85,7 @@
 import org.openqa.selenium.interactions.Sequence;
 import org.openqa.selenium.internal.Debug;
 import org.openqa.selenium.internal.Require;
+import org.openqa.selenium.io.Zip;
 import org.openqa.selenium.json.TypeToken;
 import org.openqa.selenium.logging.LocalLogs;
 import org.openqa.selenium.logging.LoggingHandler;
@@ -105,6 +109,7 @@ public class RemoteWebDriver
     implements WebDriver,
         JavascriptExecutor,
         HasCapabilities,
+        HasDownloads,
         HasFederatedCredentialManagement,
         HasVirtualAuthenticator,
         Interactive,
@@ -707,6 +712,51 @@ public void removeVirtualAuthenticator(VirtualAuthenticator authenticator) {
         ImmutableMap.of("authenticatorId", authenticator.getId()));
   }
 
+  /**
+   * Retrieves the downloadable files as a map of file names and their corresponding URLs.
+   *
+   * @return A map containing file names as keys and URLs as values.
+   * @throws WebDriverException if capability to enable downloads is not set
+   */
+  @Override
+  @SuppressWarnings("unchecked")
+  public List<String> getDownloadableFiles() {
+    requireDownloadsEnabled(capabilities);
+
+    Response response = execute(DriverCommand.GET_DOWNLOADABLE_FILES);
+    Map<String, List<String>> value = (Map<String, List<String>>) response.getValue();
+    return value.get("names");
+  }
+
+  /**
+   * Downloads a file from the specified location.
+   *
+   * @param fileName the name of the file to download
+   * @param targetLocation the location where the file should be downloaded
+   * @throws IOException if an I/O error occurs during the file download
+   */
+  @SuppressWarnings("unchecked")
+  @Override
+  public void downloadFile(String fileName, Path targetLocation) throws IOException {
+    requireDownloadsEnabled(capabilities);
+
+    Response response = execute(DriverCommand.DOWNLOAD_FILE, Map.of("name", fileName));
+    String contents = ((Map<String, String>) response.getValue()).get("contents");
+    Zip.unzip(contents, targetLocation.toFile());
+  }
+
+  /**
+   * Deletes all downloadable files.
+   *
+   * @throws WebDriverException capability to enable downloads must be set
+   */
+  @Override
+  public void deleteDownloadableFiles() {
+    requireDownloadsEnabled(capabilities);
+
+    execute(DriverCommand.DELETE_DOWNLOADABLE_FILES);
+  }
+
   @Override
   public void setDelayEnabled(boolean enabled) {
     execute(DriverCommand.SET_DELAY_ENABLED(enabled));

java/src/org/openqa/selenium/remote/codec/AbstractHttpCommandCodec.java

@@ -32,6 +32,8 @@
 import static org.openqa.selenium.remote.DriverCommand.CLOSE;
 import static org.openqa.selenium.remote.DriverCommand.DELETE_ALL_COOKIES;
 import static org.openqa.selenium.remote.DriverCommand.DELETE_COOKIE;
+import static org.openqa.selenium.remote.DriverCommand.DELETE_DOWNLOADABLE_FILES;
+import static org.openqa.selenium.remote.DriverCommand.DOWNLOAD_FILE;
 import static org.openqa.selenium.remote.DriverCommand.ELEMENT_EQUALS;
 import static org.openqa.selenium.remote.DriverCommand.ELEMENT_SCREENSHOT;
 import static org.openqa.selenium.remote.DriverCommand.FIND_CHILD_ELEMENT;
@@ -51,6 +53,7 @@
 import static org.openqa.selenium.remote.DriverCommand.GET_CREDENTIALS;
 import static org.openqa.selenium.remote.DriverCommand.GET_CURRENT_CONTEXT_HANDLE;
 import static org.openqa.selenium.remote.DriverCommand.GET_CURRENT_URL;
+import static org.openqa.selenium.remote.DriverCommand.GET_DOWNLOADABLE_FILES;
 import static org.openqa.selenium.remote.DriverCommand.GET_ELEMENT_LOCATION;
 import static org.openqa.selenium.remote.DriverCommand.GET_ELEMENT_RECT;
 import static org.openqa.selenium.remote.DriverCommand.GET_ELEMENT_SIZE;
@@ -237,6 +240,10 @@ public AbstractHttpCommandCodec() {
     defineCommand(GET_FEDCM_DIALOG_TYPE, get(fedcm + "/getdialogtype"));
     defineCommand(SET_DELAY_ENABLED, post(fedcm + "/setdelayenabled"));
     defineCommand(RESET_COOLDOWN, post(fedcm + "/resetCooldown"));
+
+    defineCommand(GET_DOWNLOADABLE_FILES, get(sessionId + "/se/files"));
+    defineCommand(DOWNLOAD_FILE, post(sessionId + "/se/files"));
+    defineCommand(DELETE_DOWNLOADABLE_FILES, delete(sessionId + "/se/files"));
   }
 
   protected static CommandSpec delete(String path) {

java/test/org/openqa/selenium/chrome/ChromeOptionsTest.java

@@ -84,6 +84,7 @@ void canAddW3CCompliantOptions() {
         .setAcceptInsecureCerts(true)
         .setPageLoadStrategy(PageLoadStrategy.EAGER)
         .setStrictFileInteractability(true)
+        .setEnableDownloads(true)
         .setImplicitWaitTimeout(Duration.ofSeconds(1))
         .setPageLoadTimeout(Duration.ofSeconds(2))
         .setScriptTimeout(Duration.ofSeconds(3));
@@ -96,6 +97,7 @@ void canAddW3CCompliantOptions() {
     assertThat(mappedOptions.get("acceptInsecureCerts")).isEqualTo(true);
     assertThat(mappedOptions.get("pageLoadStrategy")).hasToString("eager");
     assertThat(mappedOptions.get("strictFileInteractability")).isEqualTo(true);
+    assertThat(mappedOptions.get("se:downloadsEnabled")).isEqualTo(true);
 
     Map<String, Long> expectedTimeouts = new HashMap<>();
     expectedTimeouts.put("implicit", 1000L);