From 71beb64a228c1581306c22eef4b59c9594c586ae Mon Sep 17 00:00:00 2001
From: Steven Barth <steven@midlink.org>
Date: Tue, 17 Jun 2008 16:16:27 +0000
Subject: [PATCH] * Preliminary module implementation for Luci HTTPD

---
 libs/httpd/luasrc/httpd/handler/file.lua |  22 +++++
 libs/httpd/luasrc/httpd/module.lua       | 154 +++++++++++++++++++++++++++++++
 2 files changed, 176 insertions(+)
 create mode 100644 libs/httpd/luasrc/httpd/handler/file.lua
 create mode 100644 libs/httpd/luasrc/httpd/module.lua

diff --git a/libs/httpd/luasrc/httpd/handler/file.lua b/libs/httpd/luasrc/httpd/handler/file.lua
new file mode 100644
index 000000000..eb5aafd78
--- /dev/null
+++ b/libs/httpd/luasrc/httpd/handler/file.lua
@@ -0,0 +1,22 @@
+module("luci.httpd.handler.file", package.seeall)
+require("luci.httpd.module")
+require("luci.fs")
+require("ltn12")
+
+Simple = luci.util.class(luci.httpd.module.Handler)
+Response = luci.httpd.module.Response
+
+function Simple.__init__(self, docroot)
+	luci.httpd.module.Handler.__init__(self)
+	self.docroot = docroot
+end
+
+function Simple.handle(self, request, sourcein, sinkerr)
+	local file = self.docroot .. request.env.REQUEST_URI:gsub("../", "")
+	local size = luci.fs.stat(file, "size")
+	if size then
+		return Response(200, {["Content-Length"] = size}), ltn12.source.file(io.open(file))
+	else
+		return Response(404)
+	end
+end
\ No newline at end of file
diff --git a/libs/httpd/luasrc/httpd/module.lua b/libs/httpd/luasrc/httpd/module.lua
new file mode 100644
index 000000000..bb22798fe
--- /dev/null
+++ b/libs/httpd/luasrc/httpd/module.lua
@@ -0,0 +1,154 @@
+--[[
+LuCI - Lua Configuration Interface
+
+Copyright 2008 Steven Barth <steven@midlink.org>
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+	http://www.apache.org/licenses/LICENSE-2.0
+
+$Id$
+]]--
+module("luci.httpd.module", package.seeall)
+require("luci.util")
+require("ltn12")
+
+
+
+-- Server handler implementation
+Handler = luci.util.class()
+
+-- Constructor
+function Handler.__init__(self)
+	self.filters = {}
+end
+
+
+-- Adds a filter to the filter chain
+function Handler.addfilter(self, filter)
+	table.insert(self.filters, filter)
+end
+
+
+-- Creates a failure reply
+function Handler.failure(self, message)
+	response = {
+		status = 500,
+		headers = {
+			["Content-Type"] = "text/plain"
+		}
+	}
+	
+	sourceout = ltn12.source.string(message)
+	
+	return response, sourceout 
+end
+
+
+-- Processes a request
+function Handler.process(self, request, sourcein, sinkout, sinkerr)
+	-- Process incoming filters
+	for i, f in ipairs(self.filters) do
+		local i = f:get("input")
+		
+		if i then
+			sourcein = ltn12.source.chain(sourcein, i) 
+		end
+		
+		if f.request then
+			f:request(request)
+		end
+	end
+	
+	-- Run the handler
+	local stat, response, sourceout = luci.util.copcall(
+		self.handle, self, request, sourcein, sinkerr
+	)
+	
+	-- Check for any errors
+	if not stat then
+		response, sourceout = self:failure(response)
+	end
+	
+	-- Check data
+	if not luci.util.instanceof(response, Response) then
+		response, sourceout = self:failure("Core error: Invalid module response!")
+	end
+	
+	-- Process outgoing filters
+	for i, f in ipairs(self.filters) do
+		local o = f:get("output")
+		
+		if o then
+			sourceout = ltn12.source.chain(sourceout, o) 
+		end
+		
+		if f.response then
+			f:response(response)
+		end
+	end
+	
+	
+	-- Print status and headers
+	sinkout("HTTP/1.1 " .. response.status .. " " .. statusmsg[response.status] .. "\n")
+	for k, v in pairs(response.headers) do
+		sinkout(k .. ": " .. v .. "\n")
+	end
+	
+	-- End of Headers
+	sinkout("\n")
+	
+	-- Pump content
+	if sourceout then
+		ltn12.pump.all(sourceout, sinkout)
+	end
+end
+
+
+
+-- Server Filter implementation
+Filter = luci.util.class()
+
+function Filter.get(self, name)
+	return self[name] and function(...) return self[name](self, ...) end
+end
+
+-- Filters the incoming body stream
+-- abstract function Filter.input(chunk)
+
+-- Filters the outgoing body stream
+-- abstract function Filter.output(chunk)
+
+-- Filters the request object
+-- abstract function Filter.request(request)
+
+-- Filters the response object
+-- abstract function Filter.response(response)
+
+
+
+-- Handler Response 
+Response = luci.util.class()
+
+function Response.__init__(self, status, headers)
+	self.status = tonumber(status) or 200
+	self.headers = (type(headers) == "table") and headers or {}
+end
+
+function Response.addheader(self, key, value)
+	self.headers[key] = value
+end
+
+function Response.setstatus(self, status)
+	self.status = status
+end
+
+
+-- Status codes
+statusmsg = {
+	[200] = "OK",
+	[404] = "Not Found",
+	[500] = "Internal Server Error",
+}
\ No newline at end of file
-- 
2.11.0