Perfect theme configuration resolve

src/main/java/run/halo/app/handler/theme/ThemeConfigResolvers.java

@@ -0,0 +1,71 @@
+package run.halo.app.handler.theme;
+
+import org.springframework.lang.NonNull;
+import org.springframework.lang.Nullable;
+import org.springframework.stereotype.Component;
+import run.halo.app.handler.theme.impl.YamlThemeConfigResolverImpl;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+
+/**
+ * Theme configuration resolver manager.
+ *
+ * @author johnniang
+ * @date 4/10/19
+ */
+@Component
+public class ThemeConfigResolvers {
+
+    private final Map<ConfigType, ThemeConfigResolver> resolverMap = new ConcurrentHashMap<>(2);
+
+    public ThemeConfigResolvers() {
+        resolverMap.put(ConfigType.YAML, new YamlThemeConfigResolverImpl());
+        // TODO Add another theme config resolver
+    }
+
+    /**
+     * Config type enum.
+     */
+    public enum ConfigType {
+
+        YAML,
+
+        PROPERTY
+    }
+
+    /**
+     * Resolves the content.
+     *
+     * @param content content must not be blank
+     * @param type    config type
+     * @return a list of group
+     * @throws IOException throws when content conversion fails
+     */
+    public List<Group> resolve(@NonNull String content, @Nullable ConfigType type) throws IOException {
+        ThemeConfigResolver resolver = getResolver(type);
+
+        if (resolver == null) {
+            throw new UnsupportedOperationException("Unsupported theme config type: " + type);
+        }
+
+        return resolver.resolve(content);
+    }
+
+    /**
+     * Resolves the content.
+     *
+     * @param content content must not be blank
+     * @return a list of group
+     * @throws IOException throws when content conversion fails
+     */
+    public List<Group> resolve(String content) throws IOException {
+        return resolve(content, ConfigType.YAML);
+    }
+
+    private ThemeConfigResolver getResolver(@Nullable ConfigType type) {
+        return type == null ? null : resolverMap.get(type);
+    }
+}

src/main/java/run/halo/app/handler/theme/impl/YamlThemeConfigResolverImpl.java

@@ -3,7 +3,6 @@ package run.halo.app.handler.theme.impl;
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.dataformat.yaml.YAMLFactory;
 import org.springframework.lang.Nullable;
-import org.springframework.stereotype.Component;
 import run.halo.app.handler.theme.Group;
 import run.halo.app.handler.theme.Item;
 import run.halo.app.handler.theme.Option;
@@ -23,7 +22,6 @@ import java.util.Map;
  * @author johnniang
  * @date 4/10/19
  */
-@Component
 public class YamlThemeConfigResolverImpl implements ThemeConfigResolver {
 
     private final ObjectMapper yamlMapper = new ObjectMapper(new YAMLFactory());

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

@@ -2,6 +2,7 @@ package run.halo.app.service;
 
 import org.springframework.lang.NonNull;
 import org.springframework.lang.Nullable;
+import run.halo.app.handler.theme.Group;
 import run.halo.app.model.support.ThemeFile;
 import run.halo.app.model.support.ThemeProperty;
 
@@ -164,10 +165,10 @@ public interface ThemeService {
      * Fetches theme configuration.
      *
      * @param themeId must not be blank
-     * @return theme configuration or null if not found
+     * @return theme configuration
      */
-    @Nullable
-    Object fetchConfig(@NonNull String themeId);
+    @NonNull
+    List<Group> fetchConfig(@NonNull String themeId);
 
     /**
      * Renders a theme page.

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

@@ -21,6 +21,8 @@ import run.halo.app.exception.BadRequestException;
 import run.halo.app.exception.ForbiddenException;
 import run.halo.app.exception.NotFoundException;
 import run.halo.app.exception.ServiceException;
+import run.halo.app.handler.theme.Group;
+import run.halo.app.handler.theme.ThemeConfigResolvers;
 import run.halo.app.model.properties.PrimaryProperties;
 import run.halo.app.model.support.HaloConst;
 import run.halo.app.model.support.ThemeFile;
@@ -60,22 +62,23 @@ public class ThemeServiceImpl implements ThemeService {
      */
     private String activatedThemeId;
 
-    private final ObjectMapper yamlMapper;
-
     private final OptionService optionService;
 
     private final StringCacheStore cacheStore;
 
     private final Configuration configuration;
 
+    private final ThemeConfigResolvers resolvers;
+
     public ThemeServiceImpl(HaloProperties haloProperties,
                             OptionService optionService,
                             StringCacheStore cacheStore,
-                            Configuration configuration) {
+                            Configuration configuration,
+                            ThemeConfigResolvers resolvers) {
         this.optionService = optionService;
         this.cacheStore = cacheStore;
         this.configuration = configuration;
-        yamlMapper = new ObjectMapper(new YAMLFactory());
+        this.resolvers = resolvers;
         workDir = Paths.get(haloProperties.getWorkDir(), THEME_FOLDER);
     }
 
@@ -224,15 +227,15 @@ public class ThemeServiceImpl implements ThemeService {
     }
 
     @Override
-    public Object fetchConfig(String themeId) {
+    public List<Group> fetchConfig(String themeId) {
         Assert.hasText(themeId, "Theme name must not be blank");
 
         // Get theme property
         ThemeProperty themeProperty = getThemeOfNonNullBy(themeId);
 
         if (!themeProperty.isHasOptions()) {
-            // If this theme dose not has an option, then return null
-            return null;
+            // If this theme dose not has an option, then return empty list
+            return Collections.emptyList();
         }
 
         try {
@@ -247,14 +250,15 @@ public class ThemeServiceImpl implements ThemeService {
                     continue;
                 }
 
-                // Read the yaml file and return the object value
-                return yamlMapper.readValue(optionsPath.toFile(), Object.class);
+                // Read the yaml file
+                String optionContent = new String(Files.readAllBytes(optionsPath));
+                // Resolve it
+                return resolvers.resolve(optionContent);
             }
 
-            return null;
+            return Collections.emptyList();
         } catch (IOException e) {
-            log.error("Failed to read options.yaml", e);
-            return null;
+            throw new ServiceException("Failed to read options file", e);
         }
     }
 

src/main/java/run/halo/app/web/controller/admin/api/ThemeController.java

@@ -2,6 +2,7 @@ package run.halo.app.web.controller.admin.api;
 
 import io.swagger.annotations.ApiOperation;
 import org.springframework.web.bind.annotation.*;
+import run.halo.app.handler.theme.Group;
 import run.halo.app.model.support.BaseResponse;
 import run.halo.app.model.support.ThemeFile;
 import run.halo.app.model.support.ThemeProperty;
@@ -97,8 +98,8 @@ public class ThemeController {
 
     @GetMapping("{themeId}/configurations")
     @ApiOperation("Fetches theme configuration by theme id")
-    public BaseResponse<Object> fetchConfig(@PathVariable("themeId") String themeId) {
-        return BaseResponse.ok(themeService.fetchConfig(themeId));
+    public List<Group> fetchConfig(@PathVariable("themeId") String themeId) {
+        return themeService.fetchConfig(themeId);
     }
 
     @PostMapping("{themeId}/settings")