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Diego Nehab
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312
src/http.lua
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312
src/http.lua
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-----------------------------------------------------------------------------
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-- Simple HTTP/1.1 support for the Lua language using the LuaSocket toolkit.
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-- Author: Diego Nehab
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-- Date: 26/12/2000
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-- Conforming to: RFC 2068
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-----------------------------------------------------------------------------
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-----------------------------------------------------------------------------
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-- Program constants
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-----------------------------------------------------------------------------
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-- connection timeout in seconds
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local TIMEOUT = 60
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-- default port for document retrieval
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local PORT = 80
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-- user agent field sent in request
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local USERAGENT = "LuaSocket/HTTP 1.0"
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-----------------------------------------------------------------------------
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-- Tries to get a line from the server or close socket if error
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-- sock: socket connected to the server
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-- Returns
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-- line: line received or nil in case of error
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-- err: error message if any
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-----------------------------------------------------------------------------
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local try_getline = function(sock)
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line, err = sock:receive()
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if err then
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sock:close()
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return nil, err
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end
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return line
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end
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-----------------------------------------------------------------------------
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-- Tries to send a line to the server or close socket if error
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-- sock: socket connected to the server
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-- line: line to send
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-- Returns
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-- err: error message if any
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-----------------------------------------------------------------------------
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local try_sendline = function(sock, line)
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err = sock:send(line)
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if err then sock:close() end
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return err
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end
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-----------------------------------------------------------------------------
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-- Retrieves status from http reply
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-- Input
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-- reply: http reply string
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-- Returns
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-- status: integer with status code
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-----------------------------------------------------------------------------
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local get_status = function(reply)
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local _,_, status = strfind(reply, " (%d%d%d) ")
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return tonumber(status)
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end
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-----------------------------------------------------------------------------
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-- Receive server reply messages
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-- Input
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-- sock: server socket
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-- Returns
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-- status: server reply status code or nil if error
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-- reply: full server reply
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-- err: error message if any
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-----------------------------------------------------------------------------
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local get_reply = function(sock)
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local reply, err
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reply, err = %try_getline(sock)
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if not err then return %get_status(reply), reply
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else return nil, nil, err end
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end
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-----------------------------------------------------------------------------
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-- Receive and parse mime headers
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-- Input
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-- sock: server socket
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-- mime: a table that might already contain mime headers
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-- Returns
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-- mime: a table with all mime headers in the form
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-- {name_1 = "value_1", name_2 = "value_2" ... name_n = "value_n"}
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-- all name_i are lowercase
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-- nil and error message in case of error
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-----------------------------------------------------------------------------
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local get_mime = function(sock, mime)
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local line, err
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local name, value
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-- get first line
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line, err = %try_getline(sock)
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if err then return nil, err end
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-- headers go until a blank line is found
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while line ~= "" do
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-- get field-name and value
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_,_, name, value = strfind(line, "(.-):%s*(.*)")
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name = strlower(name)
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-- get next line (value might be folded)
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line, err = %try_getline(sock)
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if err then return nil, err end
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-- unfold any folded values
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while not err and line ~= "" and (strsub(line, 1, 1) == " ") do
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value = value .. line
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line, err = %try_getline(sock)
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if err then return nil, err end
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end
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-- save pair in table
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if mime[name] then
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-- join any multiple field
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mime[name] = mime[name] .. ", " .. value
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else
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-- new field
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mime[name] = value
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end
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end
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return mime
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end
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-----------------------------------------------------------------------------
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-- Receives http body
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-- Input
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-- sock: server socket
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-- mime: initial mime headers
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-- Returns
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-- body: a string containing the body of the document
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-- nil and error message in case of error
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-- Obs:
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-- mime: headers might be modified by chunked transfer
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-----------------------------------------------------------------------------
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local get_body = function(sock, mime)
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local body, err
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if mime["transfer-encoding"] == "chunked" then
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local chunk_size, line
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body = ""
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repeat
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-- get chunk size, skip extention
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line, err = %try_getline(sock)
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if err then return nil, err end
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chunk_size = tonumber(gsub(line, ";.*", ""), 16)
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if not chunk_size then
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sock:close()
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return nil, "invalid chunk size"
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end
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-- get chunk
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line, err = sock:receive(chunk_size)
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if err then
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sock:close()
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return nil, err
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end
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-- concatenate new chunk
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body = body .. line
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-- skip blank line
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_, err = %try_getline(sock)
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if err then return nil, err end
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until chunk_size <= 0
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-- store extra mime headers
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--_, err = %get_mime(sock, mime)
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--if err then return nil, err end
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elseif mime["content-length"] then
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body, err = sock:receive(tonumber(mime["content-length"]))
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if err then
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sock:close()
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return nil, err
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end
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else
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-- get it all until connection closes!
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body, err = sock:receive("*a")
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if err then
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sock:close()
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return nil, err
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end
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end
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-- return whole body
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return body
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end
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-----------------------------------------------------------------------------
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-- Parses a url and returns its scheme, user, password, host, port
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-- and path components, according to RFC 1738, Uniform Resource Locators (URL),
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-- of December 1994
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-- Input
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-- url: unique resource locator desired
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-- default: table containing default values to be returned
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-- Returns
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-- table with the following fields:
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-- host: host to connect
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-- path: url path
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-- port: host port to connect
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-- user: user name
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-- pass: password
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-- scheme: protocol
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-----------------------------------------------------------------------------
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local split_url = function(url, default)
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-- initialize default parameters
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local parsed = default or {}
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-- get scheme
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url = gsub(url, "^(.+)://", function (s) %parsed.scheme = s end)
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-- get user name and password. both can be empty!
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-- moreover, password can be ommited
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url = gsub(url, "^([^@:/]*)(:?)([^:@/]-)@", function (u, c, p)
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%parsed.user = u
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-- there can be an empty password, but the ':' has to be there
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-- or else there is no password
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%parsed.pass = nil -- kill default password
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if c == ":" then %parsed.pass = p end
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end)
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-- get host
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url = gsub(url, "^([%w%.%-]+)", function (h) %parsed.host = h end)
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-- get port if any
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url = gsub(url, "^:(%d+)", function (p) %parsed.port = p end)
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-- whatever is left is the path
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if url ~= "" then parsed.path = url end
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return parsed
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end
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-----------------------------------------------------------------------------
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-- Sends a GET message through socket
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-- Input
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-- socket: http connection socket
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-- path: path requested
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-- mime: mime headers to send in request
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-- Returns
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-- err: nil in case of success, error message otherwise
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-----------------------------------------------------------------------------
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local send_get = function(sock, path, mime)
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local err = %try_sendline(sock, "GET " .. path .. " HTTP/1.1\r\n")
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if err then return err end
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for i, v in mime do
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err = %try_sendline(sock, i .. ": " .. v .. "\r\n")
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if err then return err end
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end
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err = %try_sendline(sock, "\r\n")
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return err
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end
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-----------------------------------------------------------------------------
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-- Converts field names to lowercase
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-- Input
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-- headers: user header fields
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-- parsed: parsed url components
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-- Returns
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-- mime: a table with the same headers, but with lowercase field names
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-----------------------------------------------------------------------------
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local fill_headers = function(headers, parsed)
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local mime = {}
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headers = headers or {}
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for i,v in headers do
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mime[strlower(i)] = v
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end
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mime["connection"] = "close"
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mime["host"] = parsed.host
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mime["user-agent"] = %USERAGENT
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if parsed.user and parsed.pass then -- Basic Authentication
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mime["authorization"] = "Basic "..
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base64(parsed.user .. ":" .. parsed.pass)
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end
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return mime
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end
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-----------------------------------------------------------------------------
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-- We need base64 convertion routines for Basic Authentication Scheme
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-----------------------------------------------------------------------------
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dofile("base64.lua")
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-----------------------------------------------------------------------------
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-- Downloads and receives a http url, with its mime headers
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-- Input
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-- url: unique resource locator desired
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-- headers: headers to send with request
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-- tried: is this an authentication retry?
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-- Returns
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-- body: document body, if successfull
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-- mime: headers received with document, if sucessfull
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-- reply: server reply, if successfull
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-- err: error message, if any
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-----------------------------------------------------------------------------
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function http_get(url, headers)
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local sock, err, mime, body, status, reply
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-- get url components
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local parsed = %split_url(url, {port = %PORT, path ="/"})
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-- fill default headers
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headers = %fill_headers(headers, parsed)
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-- try connection
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sock, err = connect(parsed.host, parsed.port)
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if not sock then return nil, nil, nil, err end
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-- set connection timeout
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sock:timeout(%TIMEOUT)
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-- send request
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err = %send_get(sock, parsed.path, headers)
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if err then return nil, nil, nil, err end
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-- get server message
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status, reply, err = %get_reply(sock)
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if err then return nil, nil, nil, err end
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-- get url accordingly
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if status == 200 then -- ok, go on and get it
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mime, err = %get_mime(sock, {})
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if err then return nil, nil, reply, err end
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body, err = %get_body(sock, mime)
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if err then return nil, mime, reply, err end
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sock:close()
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return body, mime, reply
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elseif status == 301 then -- moved permanently, try again
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mime = %get_mime(sock, {})
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sock:close()
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if mime["location"] then return http_get(mime["location"], headers)
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else return nil, mime, reply end
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elseif status == 401 then
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mime, err = %get_mime(sock, {})
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if err then return nil, nil, reply, err end
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return nil, mime, reply
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end
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return nil, nil, reply
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end
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