use sample as default

src/config.ts

@@ -23,6 +23,9 @@ export class InstanceConfig implements PicSourceInfo {
   @DefineSchema({ description: '页数上限。', default: 200 })
   pageLimit: number;
 
+  @DefineSchema({ description: '使用原始图而不是 sample 图。', default: false })
+  useOriginal: boolean;
+
   // 给目标对象注入上述对象。
   applyTo(target: PicSourceInfo) {
     target.tags = this.tags;

src/index.ts

@@ -49,7 +49,7 @@ export class PicSourceInstance extends PicSource {
     }
     const pic = Random.pick(data);
     return {
-      url: pic.file_url,
+      url: this.config.useOriginal ? pic.file_url : pic.sample_url,
       description: `#${pic.id} ${pic.tags} by ${pic.author}`,
     };
   }