feat(posted): add pinned posts support and createPostV2 API

- Add mPinnedPosts (RsTlvGxsMsgIdSet) to RsPostedGroup for pin/unpin state
- Add PINNED_POSTS_CHANGED event code
- Add pinPost/unpinPost virtual methods to RsPosted interface
- Implement pin/unpin in p3posted.cc with editBoard pattern
- Add backward-compatible serialization with length checks
- Update createPostDialog to use createPostV2 with error messages
- Add Pin/Unpin context menu for post publishers
- Sort pinned posts to top regardless of sort strategy
- Add pinned visual indicator via feedFrame CSS property

src/retroshare/rsposted.h

@@ -32,6 +32,7 @@
 #include "retroshare/rsgxscommon.h"
 #include "retroshare/rsgxscircles.h"
 #include "serialiser/rsserializable.h"
+#include "serialiser/rstlvidset.h"
 
 class RsPosted;
 
@@ -46,6 +47,9 @@ struct RsPostedGroup: public RsSerializable, RsGxsGenericGroupData
 	std::string mDescription;
 	RsGxsImage mGroupImage;
 
+	/** @brief List of board pinned posts, those are displayed on top */
+	RsTlvGxsMsgIdSet mPinnedPosts;
+
 	/// @see RsSerializable
 	virtual void serial_process( RsGenericSerializer::SerializeJob j,
 								 RsGenericSerializer::SerializeContext& ctx ) override
@@ -53,6 +57,7 @@ struct RsPostedGroup: public RsSerializable, RsGxsGenericGroupData
 		RS_SERIAL_PROCESS(mMeta);
 		RS_SERIAL_PROCESS(mDescription);
 		RS_SERIAL_PROCESS(mGroupImage);
+		RS_SERIAL_PROCESS(mPinnedPosts);
 	}
 };
 
@@ -115,6 +120,8 @@ struct RsPostedPost: public RsSerializable, RsGxsGenericMsgData
 #define RSPOSTED_VIEWMODE_HOT		3
 #define RSPOSTED_VIEWMODE_COMMENTS	4
 
+#define RSPOSTED_FLAG_POST_IS_PINNED	0x0001
+
 
 enum class RsPostedEventCode: uint8_t
 {
@@ -131,6 +138,7 @@ enum class RsPostedEventCode: uint8_t
 	NEW_COMMENT              = 0x0a,
 	NEW_VOTE                 = 0x0b,
 	BOARD_DELETED            = 0x0c,
+	PINNED_POSTS_CHANGED     = 0x0d,
 };
 
 
@@ -240,6 +248,24 @@ public:
 	 */
 	virtual bool editBoard(RsPostedGroup& board) =0;
 
+	/**
+	 * @brief Pin a post to the top of a board. Admin-only. Blocking API.
+	 * @jsonapi{development}
+	 * @param[in] boardId  Id of the board
+	 * @param[in] postId   Id of the post to pin
+	 * @return false on error, true otherwise
+	 */
+	virtual bool pinPost(const RsGxsGroupId& boardId, const RsGxsMessageId& postId) =0;
+
+	/**
+	 * @brief Unpin a post from a board. Admin-only. Blocking API.
+	 * @jsonapi{development}
+	 * @param[in] boardId  Id of the board
+	 * @param[in] postId   Id of the post to unpin
+	 * @return false on error, true otherwise
+	 */
+	virtual bool unpinPost(const RsGxsGroupId& boardId, const RsGxsMessageId& postId) =0;
+
 	/**
 	 * @brief Create board. Blocking API.
 	 * @jsonapi{development}

src/rsitems/rsposteditems.cc

@@ -53,6 +53,12 @@ void RsGxsPostedGroupItem::serial_process(RsGenericSerializer::SerializeJob j,Rs
 		return ;
 
 	RsTypeSerializer::serial_process<RsTlvItem>(j,ctx,mGroupImage,"mGroupImage") ;
+
+	// Backward compat: if only description+image were written, stop here
+	if(j == RsGenericSerializer::DESERIALIZE && ctx.mOffset == ctx.mSize)
+		return ;
+
+	RsTypeSerializer::serial_process<RsTlvItem>(j,ctx,mPinnedPosts,"mPinnedPosts") ;
 }
 
 RsItem *RsGxsPostedSerialiser::create_item(uint16_t service_id,uint8_t item_subtype) const
@@ -119,6 +125,7 @@ void RsGxsPostedGroupItem::clear()
 {
 	mDescription.clear();
 	mGroupImage.TlvClear();
+	mPinnedPosts.TlvClear();
 }
 
 bool RsGxsPostedGroupItem::fromPostedGroup(RsPostedGroup &group, bool moveImage)
@@ -137,6 +144,10 @@ bool RsGxsPostedGroupItem::fromPostedGroup(RsPostedGroup &group, bool moveImage)
 	{
 		mGroupImage.binData.setBinData(group.mGroupImage.mData, group.mGroupImage.mSize);
 	}
+
+	// Copy pinned posts
+	mPinnedPosts = group.mPinnedPosts;
+
 	return true;
 }
 
@@ -154,5 +165,9 @@ bool RsGxsPostedGroupItem::toPostedGroup(RsPostedGroup &group, bool moveImage)
 	{
 		group.mGroupImage.copy((uint8_t *) mGroupImage.binData.bin_data, mGroupImage.binData.bin_len);
 	}
+
+	// Copy pinned posts
+	group.mPinnedPosts = mPinnedPosts;
+
 	return true;
 }

src/rsitems/rsposteditems.h

@@ -26,6 +26,7 @@
 #include "rsitems/rsgxscommentitems.h"
 #include "rsitems/rsgxsitems.h"
 #include "serialiser/rstlvimage.h"
+#include "serialiser/rstlvidset.h"
 
 #include "retroshare/rsposted.h"
 
@@ -48,6 +49,7 @@ public:
 	
 	std::string mDescription;
 	RsTlvImage mGroupImage;
+	RsTlvGxsMsgIdSet mPinnedPosts;
 
 };
 

src/services/p3posted.cc

@@ -890,5 +890,33 @@ bool p3Posted::editBoard(RsPostedGroup& board)
 	return true;
 }
 
+bool p3Posted::pinPost(const RsGxsGroupId& boardId, const RsGxsMessageId& postId)
+{
+	std::vector<RsPostedGroup> groupsInfo;
+	if(!getBoardsInfo({boardId}, groupsInfo))
+	{
+		std::cerr << __PRETTY_FUNCTION__ << " Error! Board not found." << std::endl;
+		return false;
+	}
+
+	RsPostedGroup board = groupsInfo.front();
+	board.mPinnedPosts.ids.insert(postId);
+	return editBoard(board);
+}
+
+bool p3Posted::unpinPost(const RsGxsGroupId& boardId, const RsGxsMessageId& postId)
+{
+	std::vector<RsPostedGroup> groupsInfo;
+	if(!getBoardsInfo({boardId}, groupsInfo))
+	{
+		std::cerr << __PRETTY_FUNCTION__ << " Error! Board not found." << std::endl;
+		return false;
+	}
+
+	RsPostedGroup board = groupsInfo.front();
+	board.mPinnedPosts.ids.erase(postId);
+	return editBoard(board);
+}
+
 RsPosted::~RsPosted() = default;
 RsGxsPostedEvent::~RsGxsPostedEvent() = default;

src/services/p3posted.h

@@ -77,6 +77,9 @@ virtual void receiveHelperChanges(std::vector<RsGxsNotify*>& changes)
 
 	bool editBoard(RsPostedGroup& board) override;
 
+	bool pinPost(const RsGxsGroupId& boardId, const RsGxsMessageId& postId) override;
+	bool unpinPost(const RsGxsGroupId& boardId, const RsGxsMessageId& postId) override;
+
 	bool createBoard(RsPostedGroup& board) override;
 
     bool createBoardV2(const std::string& board_name,