feat: 支持添加自定义内容用于follow认证 & 支持封面图 #36

src/main/java/run/halo/feed/BasicSetting.java

@@ -16,6 +16,8 @@ public class BasicSetting {
 
     private Integer outputNum = 20;
 
+    private String customContent = "";  // 用户自定义内容，可用于 follow 认证，默认为空
+
 
     enum DescriptionType {
         /**

src/main/java/run/halo/feed/FeedServiceImpl.java

@@ -180,10 +180,20 @@ private Mono<ServerResponse> postListResultToXmlServerResponse(
                     var releaseSnapshot = post.getSpec().getReleaseSnapshot();
                     var baseSnapshot = post.getSpec().getBaseSnapshot();
                     return feedSourceFinder.getPostContent(releaseSnapshot, baseSnapshot)
-                        .map(contentWrapper -> itemBuilder
-                            .description(
-                                XmlCharUtils.removeInvalidXmlChar(contentWrapper.getContent()))
-                            .build());
+                        .map(contentWrapper -> {
+                            String content = contentWrapper.getContent();
+                            String description = content;
+
+                            // 尝试提取 og:image 封面图
+                            String ogImage = extractOgImage(content);
+                            if (ogImage != null) {
+                                description = String.format("<img src=\"%s\" /><br/>", ogImage) + content;
+                            }
+
+                            return itemBuilder
+                                .description(XmlCharUtils.removeInvalidXmlChar(description))
+                                .build();
+                        });
                 } else {
                     // Set excerpt as description
                     return Mono.just(itemBuilder
@@ -215,4 +225,26 @@ private RSS2 buildBaseRss(FeedContext feedContext) {
     record FeedContext(BasicSetting basicPluginSetting, SystemSetting.Basic systemBasicSetting,
                        URL externalUrl) {
     }
+
+    // 提取 og:image, 用于在摘要中显示封面图
+    private String extractOgImage(String content) {
+        if (content == null) {
+            return null;
+        }
+
+        // 使用简单的字符串匹配来提取 og:image
+        String metaTag = "<meta property=\"og:image\" content=\"";
+        int start = content.indexOf(metaTag);
+        if (start == -1) {
+            return null;
+        }
+
+        start += metaTag.length();
+        int end = content.indexOf("\"", start);
+        if (end == -1) {
+            return null;
+        }
+
+        return content.substring(start, end);
+    }
 }

src/main/java/run/halo/feed/RSS2.java

@@ -5,6 +5,7 @@
 import org.dom4j.Document;
 import org.dom4j.DocumentHelper;
 import org.dom4j.Element;
+import org.apache.commons.lang3.StringUtils;
 
 import java.time.Instant;
 import java.time.ZoneOffset;
@@ -22,6 +23,8 @@ public class RSS2 {
 
     private List<Item> items;
 
+    private String customContent;
+
     @Data
     @Builder
     public static class Item {
@@ -62,6 +65,11 @@ public String toXmlString() {
             });
         }
 
+        // 只有当 customContent 不为空且不为空白字符时才添加
+        if (StringUtils.hasText(customContent)) {
+            channel.addElement("custom").addCDATA(customContent);
+        }
+
         return document.asXML();
     }
 }

src/main/resources/extensions/settings.yaml

@@ -32,3 +32,9 @@ spec:
           label: 内容输出条数
           value: 20
           validation: required|number|min:1
+        - $formkit: code
+          name: customContent
+          label: 自定义代码内容
+          placeholder: 在此输入要追加到RSS文件末尾的自定义内容，可用于 follow 认证等
+          value: ""    // 默认值为空
+          language: json