[PD1] Fixed stuff. Unmarshal still returns map[string]interface{}, need to fix

Projs/PD1/internal/server/datastore.go

@@ -154,3 +154,22 @@ func (ds DataStore) GetUserCertificate(uid string) protocol.Packet {
 	}
 	return protocol.NewSendUserCertPacket(uid, userCert)
 }
+
+func userExists(db *sql.DB, uid string) bool {
+    // Prepare the SQL statement for checking if a user exists
+    query := `
+        SELECT COUNT(*)
+        FROM users
+        WHERE UID = ?
+    `
+
+    var count int
+    // Execute the SQL query
+    err := db.QueryRow(query, uid).Scan(&count)
+    if err != nil {
+        log.Panicln("Error checking if user exists")
+    }
+
+    // If count is greater than 0, the user exists
+    return count > 0
+}

Projs/PD1/internal/server/server.go

@@ -9,17 +9,29 @@ import (
 
 func clientHandler(connection networking.Connection[protocol.Packet], dataStore DataStore) {
 	defer connection.Conn.Close()
-	_ = dataStore
+
+	//Get certificate sent by user
 	clientCert := connection.GetPeerCertificate()
-	oidValueMap := cryptoUtils.ExtractAllOIDValues(clientCert)
-	fmt.Println(oidValueMap)
+	//Get the OID values
+	oidMap := cryptoUtils.ExtractAllOIDValues(clientCert)
+	//Get the UID of this user
+	UID := oidMap["2.5.4.65"]
+	if UID=="" {
+		panic("User certificate does not specify it's PSEUDONYM")
+	}
 
 	for {
-		pac := connection.Receive()
+        var pac protocol.Packet
+		connection.Receive(&pac)
 		switch pac.Flag {
 		case protocol.ReqUserCertPkt:
-			//userCertPacket := dataStore.GetUserCertificate(uid)
-			//connection.Send(userCertPacket)
+            fmt.Printf("Type of pac.Body: %T\n", pac.Body)
+			UserCertPacket, ok := (pac.Body).(protocol.RequestUserCertPacket)
+			if !ok {
+				panic("Could not cast packet to it's type")
+			}
+			userCertPacket := dataStore.GetUserCertificate(UserCertPacket.UID)
+			connection.Send(userCertPacket)
 		case protocol.ReqAllMsgPkt:
 			fmt.Println("ReqAllMsg")
 		case protocol.ReqMsgPkt: