From 5f4b7ad06ba6cc22591e7b35d540e847d82ac2c5 Mon Sep 17 00:00:00 2001
From: Sameer Hoosen <tabhooked@gmail.com>
Date: Mon, 7 Sep 2020 13:16:41 +0200
Subject: [PATCH] python38Packages.telethon: Patch find_library for libssl

Telethon can use libssl to speed up encryption. The `find_library` call fails on NixOS because the environmental variables that get checked are obviously missing so we patch it with a direct path to libssl.

https://github.com/LonamiWebs/Telethon/blob/8330635a725717390e1981848737b8988a419fe1/telethon/crypto/libssl.py#L19
---
 pkgs/development/python-modules/telethon/default.nix | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pkgs/development/python-modules/telethon/default.nix b/pkgs/development/python-modules/telethon/default.nix
index f8c0661f0cd..c7cd37676d1 100644
--- a/pkgs/development/python-modules/telethon/default.nix
+++ b/pkgs/development/python-modules/telethon/default.nix
@@ -10,6 +10,11 @@ buildPythonPackage rec {
     sha256 = "1fg12gcg6ca7rjh7m3g48m30cx4aaw5g09855nlyz2sa1kw3gfyq";
   };
 
+  patchPhase = ''
+    substituteInPlace telethon/crypto/libssl.py --replace \
+      "ctypes.util.find_library('ssl')" "'${openssl.out}/lib/libssl.so'"
+  '';
+
   propagatedBuildInputs = [
     async_generator
     rsa