From cdf61e73c4de83509d4a93964cfe888fbd1f33b6 Mon Sep 17 00:00:00 2001
From: Massimiliano Assante <massimiliano.assante@isti.cnr.it>
Date: Thu, 2 Feb 2023 19:17:37 +0100
Subject: [PATCH] added get-post by id

---
 .../networking/ws/methods/v2/Posts.java       | 48 +++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/src/main/java/org/gcube/portal/social/networking/ws/methods/v2/Posts.java b/src/main/java/org/gcube/portal/social/networking/ws/methods/v2/Posts.java
index f679897..424ce18 100644
--- a/src/main/java/org/gcube/portal/social/networking/ws/methods/v2/Posts.java
+++ b/src/main/java/org/gcube/portal/social/networking/ws/methods/v2/Posts.java
@@ -28,6 +28,7 @@ import org.gcube.portal.databook.shared.Feed;
 import org.gcube.portal.databook.shared.Post;
 import org.gcube.portal.databook.shared.RangePosts;
 import org.gcube.portal.databook.shared.ex.ColumnNameNotFoundException;
+import org.gcube.portal.databook.shared.ex.FeedIDNotFoundException;
 import org.gcube.portal.databook.shared.ex.FeedTypeNotFoundException;
 import org.gcube.portal.databook.shared.ex.PrivacyLevelTypeNotFoundException;
 import org.gcube.portal.social.networking.ws.inputs.PostInputBean;
@@ -138,6 +139,53 @@ public class Posts {
 		return Response.status(status).entity(responseBean).build();
 	}
 	
+	/**
+	 * Retrieve a post by id
+	 * @return the post if the post id belongs to a post in the context identified by the token
+	 */
+	@GET
+	@Path("get-post/")
+	@Produces(MediaType.APPLICATION_JSON)
+	@StatusCodes ({
+		@ResponseCode ( code = 200, condition = "Successful retrieval of posts, reported in the 'result' field of the returned object"),
+		@ResponseCode ( code = 500, condition = ErrorMessages.ERROR_IN_API_RESULT)
+	})
+	public Response getPost(@QueryParam("id") String id) {
+		Caller caller = AuthorizationProvider.instance.get();
+		String context = ScopeProvider.instance.get();
+		ResponseBean responseBean = new ResponseBean();
+		Status status = Status.OK;
+		List<Post> posts = new ArrayList<>();
+		try{
+			logger.debug("Retrieving post with id " + id);
+			try { 
+				posts.add(CassandraConnection.getInstance().getDatabookStore().readPost(id));
+			} catch(FeedIDNotFoundException e){
+				responseBean.setMessage("The post with id " + id + " does not exist in context " + context);
+				responseBean.setSuccess(false);
+				return Response.status(status).entity(responseBean).build();
+			}
+			Filters.filterPostsPerContext(posts, context);
+			Filters.hideSensitiveInformation(posts, caller.getClient().getId());
+			if (posts.isEmpty()) {
+				responseBean.setMessage("The post with id " + id + " does not belong to this context " + context);
+				responseBean.setSuccess(false);
+				status = Status.FORBIDDEN;
+				return Response.status(status).entity(responseBean).build();
+			}
+			responseBean.setResult(posts.get(0));
+			responseBean.setMessage("");
+			responseBean.setSuccess(true);
+		}catch(Exception e){
+			logger.error("Unable to retrieve such post.", e);
+			responseBean.setMessage(e.getMessage());
+			responseBean.setSuccess(false);
+			status = Status.INTERNAL_SERVER_ERROR;
+		}
+
+		return Response.status(status).entity(responseBean).build();
+	}
+	
 	/**
 	 * Retrieve a given quantity of latest user's posts
 	 * @param quantity the number of latest post to get