831 lines
23 KiB
Lua
831 lines
23 KiB
Lua
--
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-- HTTP 1.1 library for HAProxy Lua modules
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--
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-- The library is loosely modeled after Python's Requests Library
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-- using the same field names and very similar calling conventions for
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-- "HTTP verb" methods (where we use Lua specific named parameter support)
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--
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-- In addition to client side, the library also supports server side request
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-- parsing, where we utilize HAProxy Lua API for all heavy lifting.
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--
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--
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-- Copyright (c) 2017-2020. Adis Nezirović <anezirovic@haproxy.com>
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-- Copyright (c) 2017-2020. HAProxy Technologies, LLC.
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--
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-- Licensed under the Apache License, Version 2.0 (the "License");
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-- you may not use this file except in compliance with the License.
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-- You may obtain a copy of the License at
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--
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-- http://www.apache.org/licenses/LICENSE-2.0
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--
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-- Unless required by applicable law or agreed to in writing, software
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-- distributed under the License is distributed on an "AS IS" BASIS,
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-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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-- See the License for the specific language governing permissions and
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-- limitations under the License.
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--
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-- SPDX-License-Identifier: Apache-2.0
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local _author = "Adis Nezirovic <anezirovic@haproxy.com>"
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local _copyright = "Copyright 2017-2020. HAProxy Technologies, LLC."
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local _version = "1.0.0"
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local json = require "json"
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-- Utility functions
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-- HTTP headers fetch helper
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--
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-- Returns a header value(s) according to strategy (fold by default):
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-- - single/string value for "fold", "first" and "last" strategies
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-- - table for "all" strategy (for single value, a table with single element)
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--
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-- @param hdrs table Headers table as received by http.get and friends
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-- @param name string Header name
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-- @param strategy string "multiple header values" handling strategy
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-- @return header value (string or table) or nil
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local function get_header(hdrs, name, strategy)
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if hdrs == nil or name == nil then return nil end
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local v = hdrs[name:lower()]
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if type(v) ~= "table" and strategy ~= "all" then return v end
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if strategy == nil or strategy == "fold" then
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return table.concat(v, ",")
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elseif strategy == "first" then
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return v[1]
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elseif strategy == "last" then
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return v[#v]
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elseif strategy == "all" then
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if type(v) ~= "table" then
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return {v}
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else
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return v
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end
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end
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end
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-- HTTP headers iterator helper
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--
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-- Returns key/value pairs for all header, making sure that returned values
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-- are always of string type (if necessary, it folds multiple headers with
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-- the same name)
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--
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-- @param hdrs table Headers table as received by http.get and friends
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-- @return header name/value iterator (suitable for use in "for" loops)
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local function get_headers_folded(hdrs)
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if hdrs == nil then
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return function() end
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end
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local function iter(t, k)
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local v
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k, v = next(t, k)
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if v ~= nil then
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if type(v) ~= "table" then
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return k, v
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else
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return k, table.concat(v, ",")
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end
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end
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end
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return iter, hdrs, nil
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end
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-- HTTP headers iterator
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--
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-- Returns key/value pairs for all headers, for multiple headers with same name
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-- it will return every name/value pair
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-- (i.e. you can safely use it to process responses with 'Set-Cookie' header)
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--
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-- @param hdrs table Headers table as received by http.get and friends
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-- @return header name/value iterator (suitable for use in "for" loops)
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local function get_headers_flattened(hdrs)
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if hdrs == nil then
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return function() end
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end
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local k -- top level key (string)
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local k_sub = 0 -- sub table key (integer), 0 if item not a table,
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-- nil after last sub table iteration
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local v_sub -- sub table
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return function ()
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local v
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if k_sub == 0 then
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k, v = next(hdrs, k)
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if k == nil then return end
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else
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k_sub, v = next(v_sub, k_sub)
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if k_sub == nil then
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k_sub = 0
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k, v = next(hdrs, k)
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end
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end
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if k == nil then return end
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if type(v) ~= "table" then
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return k, v
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else
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v_sub = v
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k_sub = k_sub + 1
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return k, v[k_sub]
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end
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end
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end
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--- Parse key/value pairs from a string
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--
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-- @param s Lua string with (multiple) key/value pairs (separated by 'sep')
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--
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-- @return Table with parsed keys and values or nil
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local function parse_kv(s, sep)
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if s == nil then return nil end
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idx = 1
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result = {}
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while idx < s:len() do
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i, j = s:find(sep, idx)
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if i == nil then
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k, v = string.match(s:sub(idx), "^(.-)=(.*)$")
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if k then result[k] = v end
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break
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end
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k, v = string.match(s:sub(idx, i-1), "^(.-)=(.*)$")
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if k then result[k] = v end
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idx = j + 1
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end
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if next(result) == nil then
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return nil
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else
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return result
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end
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end
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--- Make deep copy of table and it's values
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--
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-- Use only for simple tables (it handles nested table values), but not for
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-- Lua objects or similar, or very big tables (this uses recursion).
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--
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-- @param t Cloned Lua table or nil
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--
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-- @return Cloned table or nil
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local function copyTable(t)
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if type(t) ~= "table" then
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return nil
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end
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local r = {}
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for k, v in pairs(t) do
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if type(v) == "table" then
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r[k] = copyTable(v)
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else
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r[k] = v
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end
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end
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return r
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end
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--- Namespace object which hosts HTTP verb methods and request/response classes
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local M = {}
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--- HTTP response class
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M.response = {}
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M.response.__index = M.response
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local _reason = {
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[200] = "OK",
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[201] = "Created",
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[204] = "No Content",
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[301] = "Moved Permanently",
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[302] = "Found",
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[400] = "Bad Request",
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[403] = "Forbidden",
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[404] = "Not Found",
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[405] = "Method Not Allowed",
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[408] = "Request Timeout",
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[413] = "Payload Too Large",
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[429] = "Too many requests",
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[500] = "Internal Server Error",
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[501] = "Not Implemented",
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[502] = "Bad Gateway",
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[503] = "Service Unavailable",
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[504] = "Gateway Timeout"
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}
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--- Creates HTTP response from scratch
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--
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-- @param status_code HTTP status code
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-- @param reason HTTP status code text (e.g. "OK" for 200 response)
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-- @param headers HTTP response headers
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-- @param request The HTTP request which triggered the response
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-- @param encoding Default encoding for response or conversions
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--
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-- @return response object
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function M.response.create(t)
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local self = setmetatable({}, M.response)
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if not t then
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t = {}
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end
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self.status_code = t.status_code or nil
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self.reason = t.reason or _reason[self.status_code] or ""
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self.headers = copyTable(t.headers) or {}
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self.content = t.content or ""
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self.request = t.request or nil
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self.encoding = t.encoding or "utf-8"
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return self
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end
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function M.response.send(self, applet)
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applet:set_status(tonumber(self.status_code), self.reason)
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for k, v in pairs(self.headers) do
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if type(v) == "table" then
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for _, hdr_val in pairs(v) do
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applet:add_header(k, hdr_val)
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end
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else
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applet:add_header(k, v)
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end
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end
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if not self.headers["content-type"] then
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if type(self.content) == "table" then
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applet:add_header("content-type", "application/json; charset=" ..
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self.encoding)
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if next(self.content) == nil then
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-- Return empty JSON object for empty Lua tables
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-- (that makes more sense then returning [])
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self.content = "{}"
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else
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self.content = json.encode(self.content)
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end
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else
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applet:add_header("content-type", "text/plain; charset=" ..
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self.encoding)
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end
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end
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if not self.headers["content-length"] then
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applet:add_header("content-length", #tostring(self.content))
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end
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applet:start_response()
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applet:send(tostring(self.content))
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end
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--- Convert response content to JSON
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--
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-- @return Lua table (decoded json)
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function M.response.json(self)
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return json.decode(self.content)
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end
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-- Response headers getter
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--
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-- Returns a header value(s) according to strategy (fold by default):
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-- - single/string value for "fold", "first" and "last" strategies
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-- - table for "all" strategy (for single value, a table with single element)
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--
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-- @param name string Header name
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-- @param strategy string "multiple header values" handling strategy
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-- @return header value (string or table) or nil
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function M.response.get_header(self, name, strategy)
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return get_header(self.headers, name, strategy)
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end
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-- Response headers iterator
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--
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-- Yields key/value pairs for all headers, making sure that returned values
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-- are always of string type
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--
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-- @param folded boolean Specifies whether to fold headers with same name
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-- @return header name/value iterator (suitable for use in "for" loops)
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function M.response.get_headers(self, folded)
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if folded == true then
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return get_headers_folded(self.headers)
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else
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return get_headers_flattened(self.headers)
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end
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end
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--- HTTP request class (client or server side, depending on the constructor)
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M.request = {}
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M.request.__index = M.request
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--- HTTP request constructor
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--
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-- Parses client HTTP request (as forwarded by HAProxy)
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--
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-- @param applet HAProxy AppletHTTP Lua object
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--
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-- @return Request object
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function M.request.parse(applet)
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local self = setmetatable({}, M.request)
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self.method = applet.method
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if (applet.method == "POST" or applet.method == "PUT") and
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applet.length > 0 then
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self.data = applet:receive()
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if self.data == "" then self.data = nil end
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end
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self.headers = {}
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for k, v in pairs(applet.headers) do
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if (v[1]) then -- (non folded header with multiple values)
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self.headers[k] = {}
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for _, val in pairs(v) do
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table.insert(self.headers[k], val)
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end
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else
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self.headers[k] = v[0]
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end
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end
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if not self.headers["host"] then
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return nil, "Bad request, no Host header specified"
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end
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self.cookies = parse_kv(self.headers["cookie"], "; ")
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-- TODO: Patch ApletHTTP and add schema of request
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local schema = applet.schema or "http"
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local url = {schema, "://", self.headers["host"], applet.path}
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self.params = {}
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if applet.qs:len() > 0 then
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for _, arg in ipairs(core.tokenize(applet.qs, "&", true)) do
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kv = core.tokenize(arg, "=", true)
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self.params[kv[1]] = kv[2]
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end
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url[#url+1] = "?"
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url[#url+1] = applet.qs
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end
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self.url = table.concat(url)
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return self
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end
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--- Escape Lua pattern chars in HTTP multipart boundary
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--
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-- This function escapes only minimal number of characters, which can be
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-- observed in multipart boundaries, namely: -, +, ? and .
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--
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-- @param s string Data to escape
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--
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-- @return escaped data (string)
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local function escape_pattern(s)
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return s:gsub("%-", "%%-"):gsub("%+", "%%+"):gsub("%?", "%%?"):gsub("%.", "%%.")
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end
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--- Parse HTTP POST data
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--
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-- @return Table with submitted form data
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function M.request.parse_multipart(self)
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local ct = self.headers['content-type']
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if ct == nil then
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return nil, 'Content-Type header not present'
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end
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if self.data == nil then
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return nil, 'Empty body'
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end
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local body = self.data
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local result ={}
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if ct:find('^multipart/form[-]data;') then
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local boundary = ct:match('^multipart/form[-]data; boundary=["]?(.+)["]?$')
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if boundary == nil then
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return nil, 'Could not parse boundary from Content-Type'
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end
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-- per RFC2046, CLRF is treated as a part of boundary
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-- but first one does not have it, so we're going pretend
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-- it is part of the content and ignore it there (in the pattern)
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boundary = string.format('%%-%%-%s.-\r\n', escape_pattern(boundary))
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local i = 1
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local j
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local old_i
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while true do
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i, j = body:find(boundary, i)
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if i == nil then break end
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if old_i then
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local part = body:sub(old_i, i - 1)
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local k, fn, t, v = part:match('^[cC]ontent[-][dD]isposition: form[-]data; name[=]"(.+)"; filename="(.+)"\r\n[cC]ontent[-][tT]ype: (.+)\r\n\r\n(.+)\r\n$')
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if k then
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result[k] = {
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filename = fn,
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content_type = t,
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data = v
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}
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else
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k, v = part:match('^[cC]ontent[-][dD]isposition: form[-]data; name[=]"(.+)"\r\n\r\n(.+)\r\n$')
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if k then
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result[k] = v
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end
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end
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end
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i = j + 1
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old_i = i
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end
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elseif ct == 'application/x-www-form-urlencoded' then
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result = parse_kv(body, '&')
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else
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return nil, 'Unsupported Content-Type: ' .. ct
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end
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if result == nil or not next(result) then
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return nil, 'Could not parse form data'
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end
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return result
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end
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--- Reads (all) chunks from a HTTP response
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--
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-- @param socket socket object (with already established tcp connection)
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-- @param get_all boolean (true by default), collect all chunks at once
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-- or yield every chunk separately.
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--
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-- @return Full response payload or nil and an error message
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function M.receive_chunked(socket, get_all)
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if socket == nil then
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return nil, "http.receive_chunked: Socket is nil"
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end
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local data = {}
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while true do
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local chunk, err = socket:receive("*l")
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if chunk == nil then
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return nil, "http.receive_chunked(): Receive error (chunk length): " .. tostring(err)
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end
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local chunk_len = tonumber(chunk, 16)
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if chunk_len == nil then
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return nil, "http.receive_chunked(): Could not parse chunk length"
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end
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if chunk_len == 0 then
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-- TODO: support trailers
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break
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end
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-- Consume next chunk (including the \r\n)
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chunk, err = socket:receive(chunk_len+2)
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if chunk == nil then
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return nil, "http.receive_chunked(): Receive error (chunk data): " .. tostring(err)
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end
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-- Strip the \r\n before collection
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local chunk_data = string.sub(chunk, 1, -3)
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if get_all == false then
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return chunk_data
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end
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table.insert(data, chunk_data)
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end
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return table.concat(data)
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end
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|
|
|
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-- Request headers getter
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--
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-- Returns a header value(s) according to strategy (fold by default):
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-- - single/string value for "fold", "first" and "last" strategies
|
|
-- - table for "all" strategy (for single value, a table with single element)
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--
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-- @param name string Header name
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-- @param strategy string "multiple header values" handling strategy
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-- @return header value (string or table) or nil
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function M.request.get_header(self, name, strategy)
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return get_header(self.headers, name, strategy)
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end
|
|
|
|
-- Request headers iterator
|
|
--
|
|
-- Yields key/value pairs for all headers, making sure that returned values
|
|
-- are always of string type
|
|
--
|
|
-- @param hdrs table Headers table as received by http.get and friends
|
|
-- @param folded boolean Specifies whether to fold headers with same name
|
|
-- @return header name/value iterator (suitable for use in "for" loops)
|
|
function M.request.get_headers(self, folded)
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if folded == true then
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return get_headers_folded(self.headers)
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else
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return get_headers_flattened(self.headers)
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end
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end
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|
|
--- Creates HTTP request from scratch
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|
--
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-- @param method HTTP method
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-- @param url Valid HTTP url
|
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-- @param headers Lua table with request headers
|
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-- @param data Request content
|
|
-- @param params Lua table with request url arguments
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|
-- @param auth (username, password) tuple for HTTP auth
|
|
--
|
|
-- @return request object
|
|
function M.request.create(t)
|
|
local self = setmetatable({}, M.request)
|
|
|
|
if t.method then
|
|
self.method = t.method:lower()
|
|
else
|
|
self.method = "get"
|
|
end
|
|
self.url = t.url or nil
|
|
self.headers = copyTable(t.headers) or {}
|
|
self.data = t.data or nil
|
|
self.params = copyTable(t.params) or {}
|
|
self.auth = copyTable(t.auth) or {}
|
|
|
|
return self
|
|
end
|
|
|
|
--- HTTP HEAD request
|
|
function M.head(t)
|
|
return M.send("HEAD", t)
|
|
end
|
|
|
|
--- HTTP GET request
|
|
function M.get(t)
|
|
return M.send("GET", t)
|
|
end
|
|
|
|
--- HTTP PUT request
|
|
function M.put(t)
|
|
return M.send("PUT", t)
|
|
end
|
|
|
|
--- HTTP POST request
|
|
function M.post(t)
|
|
return M.send("POST", t)
|
|
end
|
|
|
|
--- HTTP DELETE request
|
|
function M.delete(t)
|
|
return M.send("DELETE", t)
|
|
end
|
|
|
|
|
|
--- Send HTTP request
|
|
--
|
|
-- @param method HTTP method
|
|
-- @param url Valid HTTP url (mandatory)
|
|
-- @param headers Lua table with request headers
|
|
-- @param data Request content
|
|
-- @param params Lua table with request url arguments
|
|
-- @param auth (username, password) tuple for HTTP auth
|
|
-- @param timeout Optional timeout for socket operations (5s by default)
|
|
--
|
|
-- @return Response object or tuple (nil, msg) on errors
|
|
|
|
-- Note that the prefered way to call this method is via Lua
|
|
-- "keyword arguments" convention, e.g.
|
|
-- http.get{uri="http://example.net"}
|
|
function M.send(method, t)
|
|
if type(t) ~= "table" then
|
|
return nil, "http." .. method:lower() ..
|
|
": expecting Request object for named parameters"
|
|
end
|
|
|
|
if type(t.url) ~= "string" then
|
|
return nil, "http." .. method:lower() .. ": 'url' parameter missing"
|
|
end
|
|
|
|
local socket = core.tcp()
|
|
socket:settimeout(t.timeout or 5)
|
|
local connect
|
|
if t.url:sub(1, 7) ~= "http://" and t.url:sub(1, 8) ~= "https://" then
|
|
t.url = "http://" .. t.url
|
|
end
|
|
local schema, host, req_uri = t.url:match("^(.*)://(.-)(/.*)$")
|
|
|
|
if not schema then
|
|
-- maybe path (request uri) is missing
|
|
schema, host = t.url:match("^(.*)://(.-)$")
|
|
if not schema then
|
|
return nil, "http." .. method:lower() .. ": Could not parse URL: " .. t.url
|
|
end
|
|
req_uri = "/"
|
|
end
|
|
|
|
local addr, port = host:match("(.*):(%d+)")
|
|
|
|
if schema == "http" then
|
|
connect = socket.connect
|
|
if not port then
|
|
addr = host
|
|
port = 80
|
|
end
|
|
elseif schema == "https" then
|
|
connect = socket.connect_ssl
|
|
if not port then
|
|
addr = host
|
|
port = 443
|
|
end
|
|
else
|
|
return nil, "http." .. method:lower() .. ": Invalid URL schema " .. tostring(schema)
|
|
end
|
|
|
|
local c, err = connect(socket, addr, port)
|
|
|
|
if c then
|
|
local req = {}
|
|
local hdr_tbl = {}
|
|
|
|
if t.headers then
|
|
for k, v in pairs(t.headers) do
|
|
if type(v) == "table" then
|
|
table.insert(hdr_tbl, k .. ": " .. table.concat(v, ","))
|
|
else
|
|
table.insert(hdr_tbl, k .. ": " .. tostring(v))
|
|
end
|
|
end
|
|
else
|
|
t.headers = {} -- dummy table
|
|
end
|
|
|
|
if not t.headers.host then
|
|
-- 'Host' header must be provided for HTTP/1.1
|
|
table.insert(hdr_tbl, "host: " .. host)
|
|
end
|
|
|
|
if not t.headers["accept"] then
|
|
table.insert(hdr_tbl, "accept: */*")
|
|
end
|
|
|
|
if not t.headers["user-agent"] then
|
|
table.insert(hdr_tbl, "user-agent: haproxy-lua-http/1.0")
|
|
end
|
|
|
|
if not t.headers.connection then
|
|
table.insert(hdr_tbl, "connection: close")
|
|
end
|
|
|
|
if t.data then
|
|
req[4] = t.data
|
|
if not t.headers or not t.headers["content-length"] then
|
|
table.insert(hdr_tbl, "content-length: " .. tostring(#t.data))
|
|
end
|
|
end
|
|
|
|
req[1] = method .. " " .. req_uri .. " HTTP/1.1\r\n"
|
|
req[2] = table.concat(hdr_tbl, "\r\n")
|
|
req[3] = "\r\n\r\n"
|
|
|
|
local r, e = socket:send(table.concat(req))
|
|
|
|
if not r then
|
|
socket:close()
|
|
return nil, "http." .. method:lower() .. ": " .. tostring(e)
|
|
end
|
|
|
|
local line
|
|
r = M.response.create()
|
|
|
|
while true do
|
|
line, err = socket:receive("*l")
|
|
|
|
if not line then
|
|
socket:close()
|
|
return nil, "http." .. method:lower() ..
|
|
": Receive error (headers): " .. err
|
|
end
|
|
|
|
if line == "" then break end
|
|
|
|
if not r.status_code then
|
|
_, r.status_code, r.reason =
|
|
line:match("(HTTP/1.[01]) (%d%d%d)(.*)")
|
|
if not _ then
|
|
socket:close()
|
|
return nil, "http." .. method:lower() ..
|
|
": Could not parse request line"
|
|
end
|
|
r.status_code = tonumber(r.status_code)
|
|
else
|
|
local sep = line:find(":")
|
|
local hdr_name = line:sub(1, sep-1):lower()
|
|
local hdr_val = line:sub(sep+1):match("^%s*(.*%S)%s*$") or ""
|
|
|
|
if r.headers[hdr_name] == nil then
|
|
r.headers[hdr_name] = hdr_val
|
|
elseif type(r.headers[hdr_name]) == "table" then
|
|
table.insert(r.headers[hdr_name], hdr_val)
|
|
else
|
|
r.headers[hdr_name] = {
|
|
r.headers[hdr_name],
|
|
hdr_val
|
|
}
|
|
end
|
|
end
|
|
end
|
|
|
|
if method:lower() == "head" then
|
|
r.content = nil
|
|
socket:close()
|
|
return r
|
|
end
|
|
|
|
if r.headers["content-length"] and tonumber(r.headers["content-length"]) > 0 then
|
|
r.content, err = socket:receive("*a")
|
|
|
|
if not r.content then
|
|
socket:close()
|
|
return nil, "http." .. method:lower() ..
|
|
": Receive error (content): " .. err
|
|
end
|
|
end
|
|
|
|
if r.headers["transfer-encoding"] and r.headers["transfer-encoding"] == "chunked" then
|
|
r.content, err = M.receive_chunked(socket)
|
|
if r.content == nil then
|
|
socket:close()
|
|
return nil, err
|
|
end
|
|
end
|
|
|
|
socket:close()
|
|
return r
|
|
else
|
|
return nil, "http." .. method:lower() .. ": Connection error: " .. tostring(err)
|
|
end
|
|
end
|
|
|
|
M.base64 = {}
|
|
|
|
--- URL safe base64 encoder
|
|
--
|
|
-- Padding ('=') is omited, as permited per RFC
|
|
-- https://tools.ietf.org/html/rfc4648
|
|
-- in order to follow JSON Web Signature RFC
|
|
-- https://tools.ietf.org/html/rfc7515
|
|
--
|
|
-- @param s String (can be binary data) to encode
|
|
-- @param enc Function which implements base64 encoder (e.g. HAProxy base64 fetch)
|
|
-- @return Encoded string
|
|
function M.base64.encode(s, enc)
|
|
if not s then return nil end
|
|
local u = enc(s)
|
|
|
|
if not u then
|
|
return nil
|
|
end
|
|
|
|
local pad_len = 2 - ((#s-1) % 3)
|
|
|
|
if pad_len > 0 then
|
|
return u:sub(1, - pad_len - 1):gsub('[+]', '-'):gsub('[/]', '_')
|
|
else
|
|
return u:gsub('[+]', '-'):gsub('[/]', '_')
|
|
end
|
|
end
|
|
|
|
--- URLsafe base64 decoder
|
|
--
|
|
-- @param s Base64 string to decode
|
|
-- @param dec Function which implements base64 decoder (e.g. HAProxy b64dec fetch)
|
|
-- @return Decoded string (can be binary data)
|
|
function M.base64.decode(s, dec)
|
|
if not s then return nil end
|
|
|
|
local e = s:gsub('[-]', '+'):gsub('[_]', '/')
|
|
return dec(e .. string.rep('=', 3 - ((#s - 1) % 4)))
|
|
end
|
|
|
|
return M
|