feat: add work dir backup options

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

@@ -6,8 +6,12 @@
 
 import io.swagger.annotations.ApiOperation;
 import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
 import java.nio.file.Paths;
 import java.util.List;
+import java.util.Objects;
+import java.util.stream.Collectors;
 import javax.servlet.http.HttpServletRequest;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.core.io.Resource;
@@ -81,8 +85,19 @@ public BackupDTO getMarkdownBackup(@RequestParam("filename") String filename) {
     @PostMapping("work-dir")
     @ApiOperation("Backups work directory")
     @DisableOnCondition
-    public BackupDTO backupHalo() {
-        return backupService.backupWorkDirectory();
+    public BackupDTO backupHalo(@RequestBody List<String> options) {
+        return backupService.backupWorkDirectory(options);
+    }
+
+    @GetMapping("work-dir/options")
+    @ApiOperation("Gets items that can be backed up")
+    public List<String> listBackupItems() throws IOException {
+        return Files.list(Paths.get(haloProperties.getWorkDir()))
+            .map(Path::getFileName)
+            .filter(Objects::nonNull)
+            .map(Path::toString)
+            .sorted()
+            .collect(Collectors.toList());
     }
 
     @GetMapping("work-dir")

src/main/java/run/halo/app/service/BackupService.java

@@ -32,11 +32,11 @@ public interface BackupService {
     /**
      * Zips work directory.
      *
+     * @param options file or directory items to back up
      * @return backup dto.
      */
     @NonNull
-    BackupDTO backupWorkDirectory();
-
+    BackupDTO backupWorkDirectory(List<String> options);
 
     /**
      * Lists all backups.

src/main/java/run/halo/app/service/impl/BackupServiceImpl.java

@@ -33,10 +33,12 @@
 import org.springframework.lang.NonNull;
 import org.springframework.stereotype.Service;
 import org.springframework.util.Assert;
+import org.springframework.util.CollectionUtils;
 import org.springframework.web.multipart.MultipartFile;
 import run.halo.app.config.properties.HaloProperties;
 import run.halo.app.event.options.OptionUpdatedEvent;
 import run.halo.app.event.theme.ThemeUpdatedEvent;
+import run.halo.app.exception.BadRequestException;
 import run.halo.app.exception.NotFoundException;
 import run.halo.app.exception.ServiceException;
 import run.halo.app.handler.file.FileHandler;
@@ -213,7 +215,10 @@ public BasePostDetailDTO importMarkdown(MultipartFile file) throws IOException {
     }
 
     @Override
-    public BackupDTO backupWorkDirectory() {
+    public BackupDTO backupWorkDirectory(List<String> options) {
+        if (CollectionUtils.isEmpty(options)) {
+            throw new BadRequestException("The options parameter is missing, at least one.");
+        }
         // Zip work directory to temporary file
         try {
             // Create zip path for halo zip
@@ -229,7 +234,17 @@ public BackupDTO backupWorkDirectory() {
 
             // Zip halo
             run.halo.app.utils.FileUtils
-                .zip(Paths.get(this.haloProperties.getWorkDir()), haloZipPath);
+                .zip(Paths.get(this.haloProperties.getWorkDir()), haloZipPath,
+                    path -> {
+                        for (String itemToBackup : options) {
+                            Path backupItemPath =
+                                Paths.get(this.haloProperties.getWorkDir()).resolve(itemToBackup);
+                            if (path.startsWith(backupItemPath)) {
+                                return true;
+                            }
+                        }
+                        return false;
+                    });
 
             // Build backup dto
             return buildBackupDto(BACKUP_RESOURCE_BASE_URI, haloZipPath);

src/main/java/run/halo/app/utils/FileUtils.java

@@ -185,6 +185,23 @@ public static void zip(@NonNull Path pathToZip, @NonNull Path pathOfArchive)
         }
     }
 
+    /**
+     * Zips folder or file with filter.
+     *
+     * @param pathToZip file path to zip must not be null
+     * @param pathOfArchive zip file path to archive must not be null
+     * @param filter folder or file filter
+     * @throws IOException throws when failed to access file to be zipped
+     */
+    public static void zip(@NonNull Path pathToZip, @NonNull Path pathOfArchive,
+        @Nullable Predicate<Path> filter) throws IOException {
+        try (OutputStream outputStream = Files.newOutputStream(pathOfArchive)) {
+            try (ZipOutputStream zipOut = new ZipOutputStream(outputStream)) {
+                zip(pathToZip, zipOut, filter);
+            }
+        }
+    }
+
     /**
      * Zips folder or file.
      *
@@ -198,6 +215,20 @@ public static void zip(@NonNull Path pathToZip, @NonNull ZipOutputStream zipOut)
         zip(pathToZip, pathToZip.getFileName().toString(), zipOut);
     }
 
+    /**
+     * Zips folder or file with filter.
+     *
+     * @param pathToZip file path to zip must not be null
+     * @param zipOut zip output stream must not be null
+     * @param filter directory or file filter
+     * @throws IOException throws when failed to access file to be zipped
+     */
+    public static void zip(@NonNull Path pathToZip, @NonNull ZipOutputStream zipOut,
+        Predicate<Path> filter) throws IOException {
+        // Zip file
+        zip(pathToZip, pathToZip.getFileName().toString(), zipOut, filter);
+    }
+
     /**
      * Zips folder or file.
      *
@@ -208,6 +239,20 @@ public static void zip(@NonNull Path pathToZip, @NonNull ZipOutputStream zipOut)
      */
     private static void zip(@NonNull Path fileToZip, @NonNull String fileName,
         @NonNull ZipOutputStream zipOut) throws IOException {
+        zip(fileToZip, fileName, zipOut, null);
+    }
+
+    /**
+     * Zips folder or file with path filter.
+     *
+     * @param fileToZip file path to zip must not be null
+     * @param fileName file name must not be blank
+     * @param zipOut zip output stream must not be null
+     * @param filter directory or file filter
+     * @throws IOException throws when failed to access file to be zipped
+     */
+    private static void zip(@NonNull Path fileToZip, @NonNull String fileName,
+        @NonNull ZipOutputStream zipOut, @Nullable Predicate<Path> filter) throws IOException {
         if (Files.isDirectory(fileToZip)) {
             log.debug("Try to zip folder: [{}]", fileToZip);
             // Append with '/' if missing
@@ -222,10 +267,12 @@ private static void zip(@NonNull Path fileToZip, @NonNull String fileName,
             try (Stream<Path> subPathStream = Files.list(fileToZip)) {
                 // There should not use foreach for stream as internal zip method will throw
                 // IOException
-                List<Path> subFiles = subPathStream.collect(Collectors.toList());
+                List<Path> subFiles =
+                    filter != null ? subPathStream.filter(filter).collect(Collectors.toList())
+                        : subPathStream.collect(Collectors.toList());
                 for (Path subFileToZip : subFiles) {
                     // Zip children
-                    zip(subFileToZip, folderName + subFileToZip.getFileName(), zipOut);
+                    zip(subFileToZip, folderName + subFileToZip.getFileName(), zipOut, filter);
                 }
             }
         } else {