handle cross socket message passing

shared/src/player_session.gleam

@@ -1,8 +1,10 @@
+import gleam/bit_array
+import gleam/crypto
 import gleam/dynamic/decode
 import gleam/json
 
 pub type PlayerSession {
-  PlayerSession(id: Int, token_hash: String, username: String)
+  PlayerSession(id: Int, token_hash: String, username: String, socket_id: Int)
 }
 
 pub fn encode_player_session(player_session: PlayerSession) -> json.Json {
@@ -10,6 +12,7 @@ pub fn encode_player_session(player_session: PlayerSession) -> json.Json {
     #("id", json.int(player_session.id)),
     #("token_hash", json.string(player_session.token_hash)),
     #("username", json.string(player_session.username)),
+    #("socket_id", json.int(player_session.socket_id)),
   ])
 }
 
@@ -17,5 +20,14 @@ pub fn player_session_decoder() -> decode.Decoder(PlayerSession) {
   use id <- decode.field("id", decode.int)
   use token_hash <- decode.field("token_hash", decode.string)
   use username <- decode.field("username", decode.string)
-  decode.success(PlayerSession(id:, token_hash:, username:))
+  use socket_id <- decode.field("socket_id", decode.int)
+  decode.success(PlayerSession(id:, token_hash:, username:, socket_id:))
+}
+
+pub fn hash_token(token: String) -> String {
+  let token =
+    crypto.new_hasher(crypto.Sha512)
+    |> crypto.hash_chunk(bit_array.from_string(token))
+    |> crypto.digest
+    |> bit_array.base64_encode(True)
 }