feat: add gravatar url into annotation of spec of comment for anonymous (#5642)

/kind feature
/area core

#### What this PR does / why we need it:

see https://github.com/halo-dev/plugin-comment-widget/issues/97

#### Which issue(s) this PR fixes:

Fixes #5641 

```release-note
评论数据返回邮箱地址 hash 值以便生成默认头像
```

api/src/main/java/run/halo/app/core/extension/content/Comment.java

@@ -100,6 +100,7 @@ public class Comment extends AbstractExtension {
         public static final String KIND_EMAIL = "Email";
         public static final String AVATAR_ANNO = "avatar";
         public static final String WEBSITE_ANNO = "website";
+        public static final String EMAIL_HASH_ANNO = "email-hash";
 
         @Schema(requiredMode = REQUIRED, minLength = 1)
         private String kind;

application/src/main/java/run/halo/app/theme/finders/impl/CommentPublicQueryServiceImpl.java

@@ -8,16 +8,19 @@ import static run.halo.app.extension.index.query.QueryFactory.isNull;
 import static run.halo.app.extension.index.query.QueryFactory.or;
 
 import java.security.Principal;
+import java.util.HashMap;
 import java.util.Optional;
 import java.util.function.Function;
 import lombok.RequiredArgsConstructor;
 import org.apache.commons.lang3.BooleanUtils;
+import org.apache.commons.lang3.StringUtils;
 import org.springframework.data.domain.Sort;
 import org.springframework.lang.Nullable;
 import org.springframework.security.core.context.ReactiveSecurityContextHolder;
 import org.springframework.security.core.context.SecurityContext;
 import org.springframework.stereotype.Component;
 import org.springframework.util.Assert;
+import org.springframework.util.DigestUtils;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 import run.halo.app.content.comment.OwnerInfo;
@@ -167,6 +170,15 @@ public class CommentPublicQueryServiceImpl implements CommentPublicQueryService
         commentVo.getSpec().setIpAddress("");
         var specOwner = commentVo.getSpec().getOwner();
         specOwner.setName("");
+        var email = owner.getEmail();
+        if (StringUtils.isNotBlank(email)) {
+            var emailHash = DigestUtils.md5DigestAsHex(email.getBytes());
+            if (specOwner.getAnnotations() == null) {
+                specOwner.setAnnotations(new HashMap<>(2));
+            }
+            specOwner.getAnnotations()
+                .put(Comment.CommentOwner.EMAIL_HASH_ANNO, emailHash);
+        }
         if (specOwner.getAnnotations() != null) {
             specOwner.getAnnotations().remove("Email");
         }
@@ -210,6 +222,15 @@ public class CommentPublicQueryServiceImpl implements CommentPublicQueryService
         replyVo.getSpec().setIpAddress("");
         var specOwner = replyVo.getSpec().getOwner();
         specOwner.setName("");
+        var email = owner.getEmail();
+        if (StringUtils.isNotBlank(email)) {
+            var emailHash = DigestUtils.md5DigestAsHex(email.getBytes());
+            if (specOwner.getAnnotations() == null) {
+                specOwner.setAnnotations(new HashMap<>(2));
+            }
+            specOwner.getAnnotations()
+                .put(Comment.CommentOwner.EMAIL_HASH_ANNO, emailHash);
+        }
         if (specOwner.getAnnotations() != null) {
             specOwner.getAnnotations().remove("Email");
         }

application/src/test/java/run/halo/app/theme/finders/impl/CommentPublicQueryServiceIntegrationTest.java

@@ -389,7 +389,7 @@ class CommentPublicQueryServiceIntegrationTest {
                                 "name":"",
                                 "displayName":"fake-display-name",
                                 "annotations":{
-
+                                    "email-hash": "4249f4df72b475e7894fabed1c5888cf"
                                 }
                             },
                             "creationTime": "2024-03-11T06:23:42.923294424Z",