NON-ISSUE Make Java11 compatible. (Remove javax dependency)

This closes #382.

Author: kazuki-ma

line-bot-cli/src/main/java/com/linecorp/bot/cli/RichMenuImageUploadCommand.java

@@ -18,16 +18,19 @@
 
 import static com.google.common.base.Preconditions.checkNotNull;
 import static com.google.common.util.concurrent.Futures.getUnchecked;
-import static javax.activation.FileTypeMap.getDefaultFileTypeMap;
 
 import java.io.IOException;
+import java.net.FileNameMap;
+import java.net.URLConnection;
 import java.nio.file.Files;
 import java.nio.file.Paths;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.stereotype.Component;
 
+import com.google.common.annotations.VisibleForTesting;
+
 import com.linecorp.bot.cli.arguments.Arguments;
 import com.linecorp.bot.client.LineMessagingClient;
 import com.linecorp.bot.model.response.BotApiResponse;
@@ -40,14 +43,16 @@
 @ConditionalOnProperty(name = "command", havingValue = "richmenu-upload")
 @AllArgsConstructor(onConstructor = @__(@Autowired))
 public class RichMenuImageUploadCommand implements CliCommand {
+    private static final FileNameMap FILE_NAME_MAP = URLConnection.getFileNameMap();
+
     private LineMessagingClient lineMessagingClient;
     private Arguments arguments;
 
     @Override
     public void execute() throws IOException {
         final String richMenuId = checkNotNull(arguments.getRichMenuId(), "--rich-menu-id= is not set.");
         final String image = checkNotNull(arguments.getImage(), "--image= is not set.");
-        final String contentType = checkNotNull(getDefaultFileTypeMap().getContentType(image),
+        final String contentType = checkNotNull(resolveContentTypeForFileName(image),
                                                 "Can't assume Content-Type");
         log.info("Content-Type: {}", contentType);
 
@@ -57,4 +62,9 @@ public void execute() throws IOException {
 
         log.info("Request Successfully finished. {}", botApiResponse);
     }
+
+    @VisibleForTesting
+    static String resolveContentTypeForFileName(final String fileName) {
+        return FILE_NAME_MAP.getContentTypeFor(fileName);
+    }
 }

line-bot-cli/src/test/java/com/linecorp/bot/cli/RichMenuImageUploadCommandTest.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright 2019 LINE Corporation
+ *
+ * LINE Corporation 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 com.linecorp.bot.cli;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.function.Function;
+
+import org.junit.Test;
+
+public class RichMenuImageUploadCommandTest {
+
+    @Test
+    public void resolveContentTypeForFileNameTest() {
+        final Function<String, String> target =
+                RichMenuImageUploadCommand::resolveContentTypeForFileName;
+
+        // Verify
+        assertThat(target.apply("image.PNG")).isEqualTo("image/png");
+        assertThat(target.apply("image.png")).isEqualTo("image/png");
+        assertThat(target.apply("image.jpg")).isEqualTo("image/jpeg");
+        assertThat(target.apply("image.jpeg")).isEqualTo("image/jpeg");
+    }
+}