From 51c61834e3edf60b9df877f628801704adf1c70d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gabriel=20P=C3=A9rez-Cerezo?= <gabriel@gpcf.eu>
Date: Wed, 17 Apr 2019 09:15:32 +0200
Subject: First commit

---
 README.md   | 21 ++++++++++++++
 channel.lua | 93 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 init.lua    | 16 +++++++++++
 webmail.lua | 53 +++++++++++++++++++++++++++++++++++
 4 files changed, 183 insertions(+)
 create mode 100644 README.md
 create mode 100644 channel.lua
 create mode 100644 init.lua
 create mode 100644 webmail.lua

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..894fad9
--- /dev/null
+++ b/README.md
@@ -0,0 +1,21 @@
+# Auth_export mod for minetest 
+
+This is an ad-hoc mod written to interface Minetest with Mediawiki
+(see [the mediawiki plugin](/AuthMinetest.git/)). It is intended only
+for usage with the http server bundled with the mediawiki plugin.
+
+# Installation
+
+To set up your minetest installation to communicate with the minetest server, edit your "minetest.conf":
+
+```
+# enable curl/http on that mod
+secure.http_mods = mail
+secure.http_mods = auth_export
+```
+
+# credits
+
+This mod is essentially scavenged from
+[the webmail mod](https://github.com/thomasrudin-mt/mail) by Thomas
+Rudin.
diff --git a/channel.lua b/channel.lua
new file mode 100644
index 0000000..2885e68
--- /dev/null
+++ b/channel.lua
@@ -0,0 +1,93 @@
+-- bi-directional http-channel
+-- with long-poll GET and POST on the same URL
+
+local debug = true
+
+local function Channel(http, url, cfg)
+	cfg = cfg or {}
+	local extra_headers = cfg.extra_headers or {}
+	local timeout = cfg.timeout or 1
+	local long_poll_timeout = cfg.long_poll_timeout or 30
+	local error_retry = cfg.error_retry or 10
+
+	-- assemble post-header with json content
+	local post_headers = { "Content-Type: application/json" }
+	for _,header in pairs(cfg.extra_headers) do
+		table.insert(post_headers, header)
+	end
+
+	local recv_listeners = {}
+	local run = true
+
+	local recv_loop
+
+	recv_loop = function()
+		assert(run)
+
+		-- long-poll GET
+		http.fetch({
+			url = url,
+			extra_headers = extra_headers,
+			timeout = long_poll_timeout
+		}, function(res)
+			if res.succeeded and res.code == 200 then
+				local data = minetest.parse_json(res.data)
+
+				if debug then
+					minetest.log("action", "[webmail-rx] " .. dump(data))
+				end
+
+				if data then
+					for _,listener in pairs(recv_listeners) do
+						listener(data)
+					end
+				end
+				-- reschedule immediately
+				minetest.after(0, recv_loop)
+			else
+				-- error, retry after some time
+				minetest.after(error_retry, recv_loop)
+			end
+		end)
+	end
+
+
+	local send = function(data)
+		assert(run)
+		-- POST
+
+		if debug then
+			minetest.log("action", "[webmail-tx] " .. dump(data))
+		end
+
+		http.fetch({
+			url = url,
+			extra_headers = post_headers,
+			timeout = timeout,
+			post_data = minetest.write_json(data)
+		}, function(res)
+			-- TODO: error-handling
+		end)
+	end
+
+	local receive = function(listener)
+		table.insert(recv_listeners, listener)
+	end
+
+	local close = function()
+		run = false
+	end
+
+	recv_loop();
+
+	return {
+		send = send,
+		receive = receive,
+		close = close
+	}
+
+end
+
+
+
+return Channel
diff --git a/init.lua b/init.lua
new file mode 100644
index 0000000..990ee0c
--- /dev/null
+++ b/init.lua
@@ -0,0 +1,16 @@
+local http = minetest.request_http_api()
+mail = {}
+local MP = minetest.get_modpath(minetest.get_current_modname())
+mail.webmail = {}
+mail.webmail.disallow_banned_players = true 
+if http then
+	local webmail_url = "http://127.0.0.1:8080"
+	local webmail_key = "foo bar baz" -- not used in the mod but might get used in the future.
+
+	if not webmail_url then error("webmail.url is not defined") end
+	if not webmail_key then error("webmail.key is not defined") end
+
+	print("[mail] loading webmail-component with endpoint: " .. webmail_url)
+	dofile(MP .. "/webmail.lua")
+	mail.webmail_init(http, webmail_url, webmail_key)
+end
diff --git a/webmail.lua b/webmail.lua
new file mode 100644
index 0000000..5131adf
--- /dev/null
+++ b/webmail.lua
@@ -0,0 +1,53 @@
+-- false per default
+local has_xban2_mod = minetest.get_modpath("xban2")
+
+local MP = minetest.get_modpath(minetest.get_current_modname())
+local Channel = dofile(MP .. "/channel.lua")
+local channel
+-- auth request from webmail
+local function auth_handler(auth)
+	local handler = minetest.get_auth_handler()
+	minetest.log("action", "[webmail] auth: " .. auth.name)
+
+	local success = false
+	local banned = false
+	local message = ""
+
+	if mail.webmail.disallow_banned_players and has_xban2_mod then
+		-- check xban db
+		local xbanentry = xban.find_entry(auth.name)
+		if xbanentry and xbanentry.banned then
+			banned = true
+			message = "Banned!"
+		end
+	end
+
+	if not banned then
+		local entry = handler.get_auth(auth.name)
+		if entry and minetest.check_password_entry(auth.name, entry.password, auth.password) then
+			success = true
+		end
+	end
+
+	channel.send({
+		type = "auth",
+		data = {
+			name = auth.name,
+			success = success,
+			message = message
+		}
+	})
+end
+
+
+function mail.webmail_init(http, url, key)
+	channel = Channel(http, url .. "/api/minetest/channel", {
+		extra_headers = { "webmailkey: " .. key }
+	})
+
+	channel.receive(function(data)
+		if data.type == "auth" then
+			auth_handler(data.data)
+		end
+	end)
+end
-- 
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