Refactor migrate api.

src/main/java/run/halo/app/controller/admin/api/MigrateController.java

@@ -36,4 +36,10 @@ public class MigrateController {
     public void migrateWordPress(@RequestPart("file") MultipartFile file) {
         migrateService.migrate(file, MigrateType.WORDPRESS);
     }
+
+    @PostMapping("cnblogs")
+    @ApiOperation("Migrate from cnblogs")
+    public void migrateCnBlogs(@RequestPart("file") MultipartFile file) {
+        migrateService.migrate(file, MigrateType.CNBLOGS);
+    }
 }

src/main/java/run/halo/app/handler/migrate/CnBlogsMigrateHandler.java

@@ -0,0 +1,23 @@
+package run.halo.app.handler.migrate;
+
+import org.springframework.web.multipart.MultipartFile;
+import run.halo.app.model.enums.MigrateType;
+
+/**
+ * Cnblogs(https://cnblogs.com) migrate handler.
+ *
+ * @author ryanwang
+ * @date 2019-10-30
+ */
+public class CnBlogsMigrateHandler implements MigrateHandler {
+
+    @Override
+    public void migrate(MultipartFile file) {
+        // TODO
+    }
+
+    @Override
+    public boolean supportType(MigrateType type) {
+        return MigrateType.CNBLOGS.equals(type);
+    }
+}

src/main/java/run/halo/app/model/enums/MigrateType.java

@@ -16,7 +16,12 @@ public enum MigrateType implements ValueEnum<Integer> {
     /**
      * WordPress
      */
-    WORDPRESS(1);
+    WORDPRESS(1),
+
+    /**
+     * cnblogs.com
+     */
+    CNBLOGS(2);
 
     private Integer value;