Add support for overriding host

Author: tfwright

priv/post.erl.eex

@@ -67,6 +67,8 @@ handle_response({ok, StatusCode, ResponseHeaders, Client}) ->
 handle_response({error, Reason}) ->
     {error, Reason}.
 
+build_host(_EndpointPrefix, #{host := Host}) when is_binary(Host) ->
+    Host;
 build_host(_EndpointPrefix, #{region := <<"local">>}) ->
     <<"localhost">>;<%= if context.is_global do %>
 build_host(EndpointPrefix, #{endpoint := Endpoint}) ->

priv/post.ex.eex

@@ -49,6 +49,9 @@ defmodule <%= context.module_name %> do
     end
   end
 
+  defp build_host(_endpoint_prefix, %{host: host}) when is_binary(host) do
+    host
+  end
   defp build_host(_endpoint_prefix, %{region: "local"}) do
     "localhost"
   end<%= if context.is_global do %>

priv/rest.erl.eex

@@ -150,6 +150,8 @@ handle_response({ok, StatusCode, ResponseHeaders, Client}, _) ->
     {error, Error, {StatusCode, ResponseHeaders, Client}};
 handle_response({error, Reason}, _) ->
   {error, Reason}.
+build_host(_AccountId, _EndpointPrefix, #{host := Host}) when is_binary(Host) ->
+    Host;
 <%= if context.endpoint_prefix == "s3-control" do %>
 build_host(_AccountId, _EndpointPrefix, #{region := <<"local">>}) ->
     <<"localhost">>;

priv/rest.ex.eex

@@ -133,6 +133,10 @@ defmodule <%= context.module_name %> do
         {:error, %HTTPoison.Error{reason: reason}}
     end
   end
+
+  defp build_host(_endpoint_prefix, %{host: host}) when is_binary(host) do
+    host
+  end
 <%= if context.endpoint_prefix == "s3-control" do %>
   defp build_host(_account_id, _endpoint_prefix, %{region: "local"}) do
     "localhost"