From 6d366d6c3186269c9d392b196e3ce8b01a51c4cd Mon Sep 17 00:00:00 2001
From: therusskiy <dimanrussian@gmail.com>
Date: Sun, 8 Oct 2017 18:11:12 +0400
Subject: [PATCH 1/2] ability to change payload limit

---
 README.md                 | 8 ++++++++
 config/config.exs         | 3 ++-
 lib/poxa/event_handler.ex | 3 ++-
 3 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 00dde7d..60225d3 100644
--- a/README.md
+++ b/README.md
@@ -122,6 +122,14 @@ config :poxa,
         keyfile: "priv/ssl/server.key"]
 ```
 
+Optionally you can specify a payload limit. The default value is 10kb. To change it pass
+```
+PAYLOAD_LIMIT=20000
+```
+where 20000 is number of bytes.
+
+You can also specify this value via `payload_limit` in your config file (e.g. my_config.exs) as you would for other variables.
+
 ## Release
 
 This is the preferred way to deploy a Poxa server.
diff --git a/config/config.exs b/config/config.exs
index d24d9ea..24f0351 100644
--- a/config/config.exs
+++ b/config/config.exs
@@ -11,4 +11,5 @@ config :poxa,
   app_secret: get_env("POXA_SECRET") || "secret",
   app_id: get_env("POXA_APP_ID") || "app_id",
   registry_adapter: get_env("POXA_REGISTRY_ADAPTER") || "gproc",
-  web_hook: get_env("WEB_HOOK") || nil
+  web_hook: get_env("WEB_HOOK") || nil,
+  payload_limit: get_env("PAYLOAD_LIMIT") || 10_000
diff --git a/lib/poxa/event_handler.ex b/lib/poxa/event_handler.ex
index c5b99a1..207bfa6 100644
--- a/lib/poxa/event_handler.ex
+++ b/lib/poxa/event_handler.ex
@@ -62,7 +62,8 @@ defmodule Poxa.EventHandler do
   The event data can't be greater than 10KB
   """
   def valid_entity_length(req, %{event: event} = state) do
-    valid = byte_size(event.data) <= 10_000
+    {:ok, payload_limit} = Application.fetch_env(:poxa, :payload_limit)
+    valid = byte_size(event.data) <= payload_limit
     req = if valid do
             req
           else

From b689d49cc5047abe4ba3371a0af23aa69d5cefca Mon Sep 17 00:00:00 2001
From: therusskiy <dimanrussian@gmail.com>
Date: Mon, 9 Oct 2017 15:40:32 +0400
Subject: [PATCH 2/2] adjust error and docs to reflect configurable
 payload_limit

---
 lib/poxa/event_handler.ex | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/lib/poxa/event_handler.ex b/lib/poxa/event_handler.ex
index 207bfa6..b821290 100644
--- a/lib/poxa/event_handler.ex
+++ b/lib/poxa/event_handler.ex
@@ -56,10 +56,8 @@ defmodule Poxa.EventHandler do
     {authorized, req, state}
   end
 
-  @invalid_data_size_json JSX.encode!(%{error: "Data key must be smaller than 10KB"})
-
   @doc """
-  The event data can't be greater than 10KB
+  The event data can't be greater than payload_limit which defaults to 10KB
   """
   def valid_entity_length(req, %{event: event} = state) do
     {:ok, payload_limit} = Application.fetch_env(:poxa, :payload_limit)
@@ -67,7 +65,7 @@ defmodule Poxa.EventHandler do
     req = if valid do
             req
           else
-            :cowboy_req.set_resp_body(@invalid_data_size_json, req)
+            :cowboy_req.set_resp_body(invalid_data_size_json(payload_limit), req)
           end
     {valid, req, state}
   end
@@ -89,4 +87,9 @@ defmodule Poxa.EventHandler do
     req = :cowboy_req.set_resp_body("{}", req)
     {true, req, nil}
   end
+
+  @doc false
+  defp invalid_data_size_json(payload_limit) do
+    JSX.encode!(%{error: "Data key must be smaller than #{payload_limit}B"})
+  end
 end