Add payload for discussion_comment event

src/main/java/org/kohsuke/github/GHEventPayload.java

@@ -1639,8 +1639,8 @@ public GHLabelChanges getChanges() {
     }
 
     /**
-     * A discussion was created, edited, deleted, pinned, unpinned, locked, unlocked, transferred, category_changed,
-     * answered, or unanswered.
+     * A discussion was closed, reopened, created, edited, deleted, pinned, unpinned, locked, unlocked, transferred,
+     * category_changed, answered, or unanswered.
      *
      * @see <a href=
      *      "https://docs.github.com/en/developers/webhooks-and-events/webhooks/webhook-events-and-payloads#discussion">
@@ -1673,6 +1673,40 @@ public GHLabel getLabel() {
         }
     }
 
+    /**
+     * A discussion comment was created, deleted, or edited.
+     *
+     * @see <a href=
+     *      "https://docs.github.com/en/developers/webhooks-and-events/webhooks/webhook-events-and-payloads#discussion_comment">
+     *      discussion event</a>
+     */
+    public static class DiscussionComment extends GHEventPayload {
+
+        private GHRepositoryDiscussion discussion;
+
+        private GHRepositoryDiscussionComment comment;
+
+        /**
+         * Gets discussion.
+         *
+         * @return the discussion
+         */
+        @SuppressFBWarnings(value = { "EI_EXPOSE_REP" }, justification = "Expected")
+        public GHRepositoryDiscussion getDiscussion() {
+            return discussion;
+        }
+
+        /**
+         * Gets discussion comment.
+         *
+         * @return the discussion
+         */
+        @SuppressFBWarnings(value = { "EI_EXPOSE_REP" }, justification = "Expected")
+        public GHRepositoryDiscussionComment getComment() {
+            return comment;
+        }
+    }
+
     /**
      * A star was created or deleted on a repository.
      *

src/main/java/org/kohsuke/github/GHRepositoryDiscussionComment.java

@@ -0,0 +1,85 @@
+package org.kohsuke.github;
+
+import java.io.IOException;
+import java.net.URL;
+
+/**
+ * A discussion comment in the repository.
+ * <p>
+ * This is different from Teams discussions (see {@link GHDiscussion}).
+ * <p>
+ * The discussion_comment event exposes the GraphQL object (more or less - the ids are handled differently for instance)
+ * directly. The new Discussions API is only available through GraphQL so for now you cannot execute any actions on this
+ * object.
+ *
+ * @author Guillaume Smet
+ * @see <a href="https://docs.github.com/en/graphql/guides/using-the-graphql-api-for-discussions#discussion">The GraphQL
+ *      API for Discussions</a>
+ */
+public class GHRepositoryDiscussionComment extends GHObject {
+
+    private String htmlUrl;
+
+    private Long parentId;
+    private int childCommentCount;
+
+    private GHUser user;
+    private GHCommentAuthorAssociation authorAssociation;
+    private String body;
+
+    /**
+     * Gets the html url.
+     *
+     * @return the html url
+     */
+    public URL getHtmlUrl() {
+        return GitHubClient.parseURL(htmlUrl);
+    }
+
+    /**
+     * Gets the parent comment id.
+     *
+     * @return the parent comment id
+     */
+    public Long getParentId() {
+        return parentId;
+    }
+
+    /**
+     * Gets the number of child comments.
+     *
+     * @return the number of child comments
+     */
+    public int getChildCommentCount() {
+        return childCommentCount;
+    }
+
+    /**
+     * Gets the user.
+     *
+     * @return the user
+     * @throws IOException
+     *             Signals that an I/O exception has occurred.
+     */
+    public GHUser getUser() throws IOException {
+        return root().intern(user);
+    }
+
+    /**
+     * Gets the author association.
+     *
+     * @return the author association
+     */
+    public GHCommentAuthorAssociation getAuthorAssociation() {
+        return authorAssociation;
+    }
+
+    /**
+     * Gets the body.
+     *
+     * @return the body
+     */
+    public String getBody() {
+        return body;
+    }
+}

src/test/java/org/kohsuke/github/GHEventPayloadTest.java

@@ -1423,6 +1423,76 @@ public void discussion_labeled() throws Exception {
         assertThat(label.getDescription(), is(nullValue()));
     }
 
+    /**
+     * Discussion comment created.
+     *
+     * @throws Exception
+     *             the exception
+     */
+    @Test
+    public void discussion_comment_created() throws Exception {
+        final GHEventPayload.DiscussionComment discussionCommentPayload = GitHub.offline()
+                .parseEventPayload(payload.asReader(), GHEventPayload.DiscussionComment.class);
+
+        assertThat(discussionCommentPayload.getAction(), is("created"));
+        assertThat(discussionCommentPayload.getRepository().getFullName(), is("gsmet/quarkus-bot-java-playground"));
+        assertThat(discussionCommentPayload.getSender().getLogin(), is("gsmet"));
+
+        GHRepositoryDiscussion discussion = discussionCommentPayload.getDiscussion();
+
+        GHRepositoryDiscussion.Category category = discussion.getCategory();
+
+        assertThat(category.getId(), is(33522033L));
+        assertThat(category.getNodeId(), is("DIC_kwDOEq3cwc4B_4Fx"));
+        assertThat(category.getEmoji(), is(":pray:"));
+        assertThat(category.getName(), is("Q&A"));
+        assertThat(category.getDescription(), is("Ask the community for help"));
+        assertThat(category.getCreatedAt().getTime(), is(1636991431000L));
+        assertThat(category.getUpdatedAt().getTime(), is(1636991431000L));
+        assertThat(category.getSlug(), is("q-a"));
+        assertThat(category.isAnswerable(), is(true));
+
+        assertThat(discussion.getAnswerHtmlUrl(), is(nullValue()));
+        assertThat(discussion.getAnswerChosenAt(), is(nullValue()));
+        assertThat(discussion.getAnswerChosenBy(), is(nullValue()));
+
+        assertThat(discussion.getHtmlUrl().toString(),
+                is("https://github.com/gsmet/quarkus-bot-java-playground/discussions/162"));
+        assertThat(discussion.getId(), is(6090566L));
+        assertThat(discussion.getNodeId(), is("D_kwDOEq3cwc4AXO9G"));
+        assertThat(discussion.getNumber(), is(162));
+        assertThat(discussion.getTitle(), is("New test question"));
+
+        assertThat(discussion.getUser().getLogin(), is("gsmet"));
+        assertThat(discussion.getUser().getId(), is(1279749L));
+        assertThat(discussion.getUser().getNodeId(), is("MDQ6VXNlcjEyNzk3NDk="));
+
+        assertThat(discussion.getState(), is(GHRepositoryDiscussion.State.OPEN));
+        assertThat(discussion.isLocked(), is(false));
+        assertThat(discussion.getComments(), is(1));
+        assertThat(discussion.getCreatedAt().getTime(), is(1705586390000L));
+        assertThat(discussion.getUpdatedAt().getTime(), is(1705586399000L));
+        assertThat(discussion.getAuthorAssociation(), is(GHCommentAuthorAssociation.OWNER));
+        assertThat(discussion.getActiveLockReason(), is(nullValue()));
+        assertThat(discussion.getBody(), is("Test question"));
+
+        GHRepositoryDiscussionComment comment = discussionCommentPayload.getComment();
+
+        assertThat(comment.getHtmlUrl().toString(),
+                is("https://github.com/gsmet/quarkus-bot-java-playground/discussions/162#discussioncomment-8169669"));
+        assertThat(comment.getId(), is(8169669L));
+        assertThat(comment.getNodeId(), is("DC_kwDOEq3cwc4AfKjF"));
+        assertThat(comment.getAuthorAssociation(), is(GHCommentAuthorAssociation.OWNER));
+        assertThat(comment.getCreatedAt().getTime(), is(1705586398000L));
+        assertThat(comment.getUpdatedAt().getTime(), is(1705586399000L));
+        assertThat(comment.getBody(), is("Test comment."));
+        assertThat(comment.getUser().getLogin(), is("gsmet"));
+        assertThat(comment.getUser().getId(), is(1279749L));
+        assertThat(comment.getUser().getNodeId(), is("MDQ6VXNlcjEyNzk3NDk="));
+        assertThat(comment.getParentId(), is(nullValue()));
+        assertThat(comment.getChildCommentCount(), is(0));
+    }
+
     /**
      * Starred.
      *