1 files changed, 278 insertions, 7 deletions
diff --git a/modules/luci-base/luasrc/http.lua b/modules/luci-base/luasrc/http.lua
index f1d7d6a93..aa8913607 100644
--- a/modules/luci-base/luasrc/http.lua
+++ b/modules/luci-base/luasrc/http.lua
@@ -1,19 +1,21 @@
 -- Copyright 2008 Steven Barth <steven@midlink.org>
+-- Copyright 2010-2018 Jo-Philipp Wich <jo@mein.io>
 -- Licensed to the public under the Apache License 2.0.
 
-local ltn12 = require "luci.ltn12"
-local protocol = require "luci.http.protocol"
 local util  = require "luci.util"
-local string = require "string"
 local coroutine = require "coroutine"
 local table = require "table"
 local lhttp = require "lucihttp"
+local nixio = require "nixio"
+local ltn12 = require "luci.ltn12"
 
-local ipairs, pairs, next, type, tostring, error =
-	ipairs, pairs, next, type, tostring, error
+local table, ipairs, pairs, type, tostring, tonumber, error =
+	table, ipairs, pairs, type, tostring, tonumber, error
 
 module "luci.http"
 
+HTTP_MAX_CONTENT      = 1024*8		-- 8 kB maximum content size
+
 context = util.threadlocal()
 
 Request = util.class()
@@ -29,7 +31,7 @@ function Request.__init__(self, env, sourcein, sinkerr)
 	self.message = {
 		env = env,
 		headers = {},
-		params = protocol.urldecode_params(env.QUERY_STRING or ""),
+		params = urldecode_params(env.QUERY_STRING or ""),
 	}
 
 	self.parsed_input = false
@@ -115,7 +117,7 @@ function Request.setfilehandler(self, callback)
 end
 
 function Request._parse_input(self)
-	protocol.parse_message_body(
+	parse_message_body(
 		 self.input,
 		 self.message,
 		 self.filehandler
@@ -266,3 +268,272 @@ urlencode = util.urlencode
 function write_json(x)
 	util.serialize_json(x, write)
 end
+
+-- from given url or string. Returns a table with urldecoded values.
+-- Simple parameters are stored as string values associated with the parameter
+-- name within the table. Parameters with multiple values are stored as array
+-- containing the corresponding values.
+function urldecode_params(url, tbl)
+	local parser, name
+	local params = tbl or { }
+
+	parser = lhttp.urlencoded_parser(function (what, buffer, length)
+		if what == parser.TUPLE then
+			name, value = nil, nil
+		elseif what == parser.NAME then
+			name = lhttp.urldecode(buffer)
+		elseif what == parser.VALUE and name then
+			params[name] = lhttp.urldecode(buffer) or ""
+		end
+
+		return true
+	end)
+
+	if parser then
+		parser:parse((url or ""):match("[^?]*$"))
+		parser:parse(nil)
+	end
+
+	return params
+end
+
+-- separated by "&". Tables are encoded as parameters with multiple values by
+-- repeating the parameter name with each value.
+function urlencode_params(tbl)
+	local k, v
+	local n, enc = 1, {}
+	for k, v in pairs(tbl) do
+		if type(v) == "table" then
+			local i, v2
+			for i, v2 in ipairs(v) do
+				if enc[1] then
+					enc[n] = "&"
+					n = n + 1
+				end
+
+				enc[n+0] = lhttp.urlencode(k)
+				enc[n+1] = "="
+				enc[n+2] = lhttp.urlencode(v2)
+				n = n + 3
+			end
+		else
+			if enc[1] then
+				enc[n] = "&"
+				n = n + 1
+			end
+
+			enc[n+0] = lhttp.urlencode(k)
+			enc[n+1] = "="
+			enc[n+2] = lhttp.urlencode(v)
+			n = n + 3
+		end
+	end
+
+	return table.concat(enc, "")
+end
+
+-- Content-Type. Stores all extracted data associated with its parameter name
+-- in the params table within the given message object. Multiple parameter
+-- values are stored as tables, ordinary ones as strings.
+-- If an optional file callback function is given then it is feeded with the
+-- file contents chunk by chunk and only the extracted file name is stored
+-- within the params table. The callback function will be called subsequently
+-- with three arguments:
+--  o Table containing decoded (name, file) and raw (headers) mime header data
+--  o String value containing a chunk of the file data
+--  o Boolean which indicates wheather the current chunk is the last one (eof)
+function mimedecode_message_body(src, msg, file_cb)
+	local parser, header, field
+	local len, maxlen = 0, tonumber(msg.env.CONTENT_LENGTH or nil)
+
+	parser, err = lhttp.multipart_parser(msg.env.CONTENT_TYPE, function (what, buffer, length)
+		if what == parser.PART_INIT then
+			field = { }
+
+		elseif what == parser.HEADER_NAME then
+			header = buffer:lower()
+
+		elseif what == parser.HEADER_VALUE and header then
+			if header:lower() == "content-disposition" and
+			   lhttp.header_attribute(buffer, nil) == "form-data"
+			then
+				field.name = lhttp.header_attribute(buffer, "name")
+				field.file = lhttp.header_attribute(buffer, "filename")
+			end
+
+			if field.headers then
+				field.headers[header] = buffer
+			else
+				field.headers = { [header] = buffer }
+			end
+
+		elseif what == parser.PART_BEGIN then
+			return not field.file
+
+		elseif what == parser.PART_DATA and field.name and length > 0 then
+			if field.file then
+				if file_cb then
+					file_cb(field, buffer, false)
+					msg.params[field.name] = msg.params[field.name] or field
+				else
+					if not field.fd then
+						field.fd = nixio.mkstemp(field.name)
+					end
+
+					if field.fd then
+						field.fd:write(buffer)
+						msg.params[field.name] = msg.params[field.name] or field
+					end
+				end
+			else
+				field.value = buffer
+			end
+
+		elseif what == parser.PART_END and field.name then
+			if field.file and msg.params[field.name] then
+				if file_cb then
+					file_cb(field, "", true)
+				elseif field.fd then
+					field.fd:seek(0, "set")
+				end
+			else
+				msg.params[field.name] = field.value or ""
+			end
+
+			field = nil
+
+		elseif what == parser.ERROR then
+			err = buffer
+		end
+
+		return true
+	end)
+
+	return ltn12.pump.all(src, function (chunk)
+		len = len + (chunk and #chunk or 0)
+
+		if maxlen and len > maxlen + 2 then
+			return nil, "Message body size exceeds Content-Length"
+		end
+
+		if not parser or not parser:parse(chunk) then
+			return nil, err
+		end
+
+		return true
+	end)
+end
+
+-- Content-Type. Stores all extracted data associated with its parameter name
+-- in the params table within the given message object. Multiple parameter
+-- values are stored as tables, ordinary ones as strings.
+function urldecode_message_body(src, msg)
+	local err, name, value, parser
+	local len, maxlen = 0, tonumber(msg.env.CONTENT_LENGTH or nil)
+
+	parser = lhttp.urlencoded_parser(function (what, buffer, length)
+		if what == parser.TUPLE then
+			name, value = nil, nil
+		elseif what == parser.NAME then
+			name = lhttp.urldecode(buffer)
+		elseif what == parser.VALUE and name then
+			msg.params[name] = lhttp.urldecode(buffer) or ""
+		elseif what == parser.ERROR then
+			err = buffer
+		end
+
+		return true
+	end)
+
+	return ltn12.pump.all(src, function (chunk)
+		len = len + (chunk and #chunk or 0)
+
+		if maxlen and len > maxlen + 2 then
+			return nil, "Message body size exceeds Content-Length"
+		elseif len > HTTP_MAX_CONTENT then
+			return nil, "Message body size exceeds maximum allowed length"
+		end
+
+		if not parser or not parser:parse(chunk) then
+			return nil, err
+		end
+
+		return true
+	end)
+end
+
+-- This function will examine the Content-Type within the given message object
+-- to select the appropriate content decoder.
+-- Currently the application/x-www-urlencoded and application/form-data
+-- mime types are supported. If the encountered content encoding can't be
+-- handled then the whole message body will be stored unaltered as "content"
+-- property within the given message object.
+function parse_message_body(src, msg, filecb)
+	local ctype = lhttp.header_attribute(msg.env.CONTENT_TYPE, nil)
+
+	-- Is it multipart/mime ?
+	if msg.env.REQUEST_METHOD == "POST" and
+	   ctype == "multipart/form-data"
+	then
+		return mimedecode_message_body(src, msg, filecb)
+
+	-- Is it application/x-www-form-urlencoded ?
+	elseif msg.env.REQUEST_METHOD == "POST" and
+	       ctype == "application/x-www-form-urlencoded"
+	then
+		return urldecode_message_body(src, msg)
+
+
+	-- Unhandled encoding
+	-- If a file callback is given then feed it chunk by chunk, else
+	-- store whole buffer in message.content
+	else
+
+		local sink
+
+		-- If we have a file callback then feed it
+		if type(filecb) == "function" then
+			local meta = {
+				name = "raw",
+				encoding = msg.env.CONTENT_TYPE
+			}
+			sink = function( chunk )
+				if chunk then
+					return filecb(meta, chunk, false)
+				else
+					return filecb(meta, nil, true)
+				end
+			end
+		-- ... else append to .content
+		else
+			msg.content = ""
+			msg.content_length = 0
+
+			sink = function( chunk )
+				if chunk then
+					if ( msg.content_length + #chunk ) <= HTTP_MAX_CONTENT then
+						msg.content        = msg.content        .. chunk
+						msg.content_length = msg.content_length + #chunk
+						return true
+					else
+						return nil, "POST data exceeds maximum allowed length"
+					end
+				end
+				return true
+			end
+		end
+
+		-- Pump data...
+		while true do
+			local ok, err = ltn12.pump.step( src, sink )
+
+			if not ok and err then
+				return nil, err
+			elseif not ok then -- eof
+				return true
+			end
+		end
+
+		return true
+	end
+end