+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 ipairs, pairs, next, type, tostring, error =
+ ipairs, pairs, next, type, tostring, error
+
+--- LuCI Web Framework high-level HTTP functions.
+module "luci.http"
+
+context = util.threadlocal()
+
+Request = util.class()
+function Request.__init__(self, env, sourcein, sinkerr)
+ self.input = sourcein
+ self.error = sinkerr
+
+
+ -- File handler
+ self.filehandler = function() end
+
+ -- HTTP-Message table
+ self.message = {
+ env = env,
+ headers = {},
+ params = protocol.urldecode_params(env.QUERY_STRING or ""),
+ }
+
+ self.parsed_input = false
+end
+
+function Request.formvalue(self, name, noparse)
+ if not noparse and not self.parsed_input then
+ self:_parse_input()
+ end
+
+ if name then
+ return self.message.params[name]
+ else
+ return self.message.params
+ end
+end
+
+function Request.formvaluetable(self, prefix)
+ local vals = {}
+ prefix = prefix and prefix .. "." or "."
+
+ if not self.parsed_input then
+ self:_parse_input()
+ end
+
+ local void = self.message.params[nil]
+ for k, v in pairs(self.message.params) do
+ if k:find(prefix, 1, true) == 1 then
+ vals[k:sub(#prefix + 1)] = tostring(v)
+ end
+ end
+
+ return vals
+end
+
+function Request.content(self)
+ if not self.parsed_input then
+ self:_parse_input()
+ end
+
+ return self.message.content, self.message.content_length
+end
+
+function Request.getcookie(self, name)
+ local c = string.gsub(";" .. (self:getenv("HTTP_COOKIE") or "") .. ";", "%s*;%s*", ";")
+ local p = ";" .. name .. "=(.-);"
+ local i, j, value = c:find(p)
+ return value and urldecode(value)
+end
+
+function Request.getenv(self, name)
+ if name then
+ return self.message.env[name]
+ else
+ return self.message.env
+ end
+end
+
+function Request.setfilehandler(self, callback)
+ self.filehandler = callback
+end
+
+function Request._parse_input(self)
+ protocol.parse_message_body(
+ self.input,
+ self.message,
+ self.filehandler
+ )
+ self.parsed_input = true
+end
+
+--- Close the HTTP-Connection.
+function close()
+ if not context.eoh then
+ context.eoh = true
+ coroutine.yield(3)
+ end
+
+ if not context.closed then
+ context.closed = true
+ coroutine.yield(5)
+ end
+end
+
+--- Return the request content if the request was of unknown type.
+-- @return HTTP request body
+-- @return HTTP request body length
+function content()
+ return context.request:content()
+end
+
+--- Get a certain HTTP input value or a table of all input values.
+-- @param name Name of the GET or POST variable to fetch
+-- @param noparse Don't parse POST data before getting the value
+-- @return HTTP input value or table of all input value
+function formvalue(name, noparse)
+ return context.request:formvalue(name, noparse)
+end
+
+--- Get a table of all HTTP input values with a certain prefix.
+-- @param prefix Prefix
+-- @return Table of all HTTP input values with given prefix
+function formvaluetable(prefix)
+ return context.request:formvaluetable(prefix)
+end
+
+--- Get the value of a certain HTTP-Cookie.
+-- @param name Cookie Name
+-- @return String containing cookie data
+function getcookie(name)
+ return context.request:getcookie(name)
+end
+
+--- Get the value of a certain HTTP environment variable
+-- or the environment table itself.
+-- @param name Environment variable
+-- @return HTTP environment value or environment table
+function getenv(name)
+ return context.request:getenv(name)
+end
+
+--- Set a handler function for incoming user file uploads.
+-- @param callback Handler function
+function setfilehandler(callback)
+ return context.request:setfilehandler(callback)
+end
+
+--- Send a HTTP-Header.
+-- @param key Header key
+-- @param value Header value
+function header(key, value)
+ if not context.headers then
+ context.headers = {}
+ end
+ context.headers[key:lower()] = value
+ coroutine.yield(2, key, value)
+end
+
+--- Set the mime type of following content data.
+-- @param mime Mimetype of following content
+function prepare_content(mime)
+ if not context.headers or not context.headers["content-type"] then
+ if mime == "application/xhtml+xml" then
+ if not getenv("HTTP_ACCEPT") or
+ not getenv("HTTP_ACCEPT"):find("application/xhtml+xml", nil, true) then
+ mime = "text/html; charset=UTF-8"
+ end
+ header("Vary", "Accept")
+ end
+ header("Content-Type", mime)
+ end
+end
+
+--- Get the RAW HTTP input source
+-- @return HTTP LTN12 source
+function source()
+ return context.request.input
+end
+
+--- Set the HTTP status code and status message.
+-- @param code Status code
+-- @param message Status message
+function status(code, message)
+ code = code or 200
+ message = message or "OK"
+ context.status = code
+ coroutine.yield(1, code, message)
+end
+
+--- Send a chunk of content data to the client.
+-- This function is as a valid LTN12 sink.
+-- If the content chunk is nil this function will automatically invoke close.
+-- @param content Content chunk
+-- @param src_err Error object from source (optional)
+-- @see close
+function write(content, src_err)
+ if not content then
+ if src_err then
+ error(src_err)
+ else
+ close()
+ end
+ return true
+ elseif #content == 0 then
+ return true
+ else
+ if not context.eoh then
+ if not context.status then
+ status()
+ end
+ if not context.headers or not context.headers["content-type"] then
+ header("Content-Type", "text/html; charset=utf-8")
+ end
+ if not context.headers["cache-control"] then
+ header("Cache-Control", "no-cache")
+ header("Expires", "0")
+ end
+
+
+ context.eoh = true
+ coroutine.yield(3)
+ end
+ coroutine.yield(4, content)
+ return true
+ end
+end
+
+--- Splice data from a filedescriptor to the client.
+-- @param fp File descriptor
+-- @param size Bytes to splice (optional)
+function splice(fd, size)
+ coroutine.yield(6, fd, size)
+end
+
+--- Redirects the client to a new URL and closes the connection.
+-- @param url Target URL
+function redirect(url)
+ status(302, "Found")
+ header("Location", url)
+ close()
+end
+
+--- Create a querystring out of a table of key - value pairs.
+-- @param table Query string source table
+-- @return Encoded HTTP query string
+function build_querystring(q)
+ local s = { "?" }
+
+ for k, v in pairs(q) do
+ if #s > 1 then s[#s+1] = "&" end
+
+ s[#s+1] = urldecode(k)
+ s[#s+1] = "="
+ s[#s+1] = urldecode(v)
+ end
+
+ return table.concat(s, "")
+end
+
+--- Return the URL-decoded equivalent of a string.
+-- @param str URL-encoded string
+-- @param no_plus Don't decode + to " "
+-- @return URL-decoded string
+-- @see urlencode
+urldecode = protocol.urldecode
+
+--- Return the URL-encoded equivalent of a string.
+-- @param str Source string
+-- @return URL-encoded string
+-- @see urldecode
+urlencode = protocol.urlencode
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