From 7facbb2b8d68abc608d6d36f21207d5c0f131029 Mon Sep 17 00:00:00 2001
From: href <href@random.sh>
Date: Sat, 8 Dec 2018 17:32:58 +0100
Subject: [PATCH] Push.Subscription: convert base64 to base64 urlsafe

---
 lib/pleroma/web/push/subscription.ex | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/lib/pleroma/web/push/subscription.ex b/lib/pleroma/web/push/subscription.ex
index cfab7a98e..1ad405daf 100644
--- a/lib/pleroma/web/push/subscription.ex
+++ b/lib/pleroma/web/push/subscription.ex
@@ -37,8 +37,8 @@ defmodule Pleroma.Web.Push.Subscription do
       user_id: user.id,
       token_id: token.id,
       endpoint: endpoint,
-      key_auth: key_auth,
-      key_p256dh: key_p256dh,
+      key_auth: ensure_base64_urlsafe(key_auth),
+      key_p256dh: ensure_base64_urlsafe(key_p256dh),
       data: alerts(params)
     })
   end
@@ -63,4 +63,14 @@ defmodule Pleroma.Web.Push.Subscription do
       sub -> Repo.delete(sub)
     end
   end
+
+  # Some webpush clients (e.g. iOS Toot!) use an non urlsafe base64 as an encoding for the key.
+  # However, the web push rfs specify to use base64 urlsafe, and the `web_push_encryption` library we use
+  # requires the key to be properly encoded. So we just convert base64 to urlsafe base64.
+  defp ensure_base64_urlsafe(string) do
+    string
+    |> String.replace("+", "-")
+    |> String.replace("/", "_")
+    |> String.replace("=", "")
+  end
 end