Add APIs to fetch theme info and settings according to the theme id (h…

…alo-dev#1660)

src/main/java/run/halo/app/controller/content/api/ThemeController.java

@@ -3,6 +3,7 @@
 import io.swagger.annotations.ApiOperation;
 import java.util.Map;
 import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
 import run.halo.app.handler.theme.config.support.ThemeProperty;
@@ -34,9 +35,21 @@ public ThemeProperty getBy() {
         return themeService.getThemeOfNonNullBy(themeService.getActivatedThemeId());
     }
 
+    @GetMapping("{themeId:.+}")
+    @ApiOperation("Gets theme property by theme id")
+    public ThemeProperty getBy(@PathVariable("themeId") String themeId) {
+        return themeService.getThemeOfNonNullBy(themeId);
+    }
+
     @GetMapping("activation/settings")
     @ApiOperation("Lists activated theme settings")
     public Map<String, Object> listSettingsBy() {
         return themeSettingService.listAsMapBy(themeService.getActivatedThemeId());
     }
+
+    @GetMapping("{themeId:.+}/settings")
+    @ApiOperation("Lists theme settings by theme id")
+    public Map<String, Object> listSettingsBy(@PathVariable("themeId") String themeId) {
+        return themeSettingService.listAsMapBy(themeId);
+    }
 }