From eec5d26ea19d234de7abe167ab42785620f1bd55 Mon Sep 17 00:00:00 2001
From: TheJackiMonster <thejackimonster@gmail.com>
Date: Sat, 19 Mar 2022 19:59:53 +0100
Subject: Add sending read receipts

Signed-off-by: TheJackiMonster <thejackimonster@gmail.com>
---
 include/gnunet_chat_lib.h | 12 ++++++++++++
 src/gnunet_chat_lib.c     | 45 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+)

diff --git a/include/gnunet_chat_lib.h b/include/gnunet_chat_lib.h
index 6610f59..a434381 100644
--- a/include/gnunet_chat_lib.h
+++ b/include/gnunet_chat_lib.h
@@ -813,6 +813,18 @@ int
 GNUNET_CHAT_context_send_text (struct GNUNET_CHAT_Context *context,
 			       const char *text);
 
+/**
+ * Sends a read receipt depending on a selected <i>message</i> into a given
+ * chat <i>context</i>.
+ *
+ * @param[in,out] context Chat context
+ * @param[in] message Message (optional)
+ * @return #GNUNET_OK on success, #GNUNET_SYSERR on failure
+ */
+int
+GNUNET_CHAT_context_send_read_receipt (struct GNUNET_CHAT_Context *context,
+				       const struct GNUNET_CHAT_Message *message);
+
 /**
  * Uploads a local file specified via its <i>path</i> using symmetric encryption
  * and shares the regarding information to download and decrypt it in a given
diff --git a/src/gnunet_chat_lib.c b/src/gnunet_chat_lib.c
index 2632fb5..e11c92d 100644
--- a/src/gnunet_chat_lib.c
+++ b/src/gnunet_chat_lib.c
@@ -925,6 +925,51 @@ GNUNET_CHAT_context_send_text (struct GNUNET_CHAT_Context *context,
 }
 
 
+int
+GNUNET_CHAT_context_send_read_receipt (struct GNUNET_CHAT_Context *context,
+				       const struct GNUNET_CHAT_Message *message)
+{
+  if ((!context) || (!(context->room)))
+    return GNUNET_SYSERR;
+
+  char zero = '\0';
+  struct GNUNET_MESSENGER_Message msg;
+  msg.header.kind = GNUNET_MESSENGER_KIND_TEXT;
+  msg.body.text.text = &zero;
+
+  const struct GNUNET_MESSENGER_Contact *receiver = NULL;
+
+  if (!message)
+    goto skip_filter;
+
+  if (GNUNET_CHAT_FLAG_NONE != message->flag)
+    return GNUNET_SYSERR;
+
+  if (message->flags & GNUNET_MESSENGER_FLAG_SENT)
+    return GNUNET_OK;
+
+  if (message->flags & GNUNET_MESSENGER_FLAG_PRIVATE)
+  {
+    receiver = GNUNET_MESSENGER_get_sender(context->room, &(message->hash));
+
+    if (!receiver)
+      return GNUNET_SYSERR;
+  }
+
+  if ((!(message->msg)) ||
+      (GNUNET_MESSENGER_KIND_TEXT != message->msg->header.kind))
+    goto skip_filter;
+
+  if ((!(message->msg->body.text.text)) ||
+      (!(message->msg->body.text.text[0])))
+    return GNUNET_SYSERR;
+
+skip_filter:
+  GNUNET_MESSENGER_send_message(context->room, &msg, receiver);
+  return GNUNET_OK;
+}
+
+
 struct GNUNET_CHAT_File*
 GNUNET_CHAT_context_send_file (struct GNUNET_CHAT_Context *context,
 			       const char *path,
-- 
cgit v1.2.3