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request.lua
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request.lua
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local lpeg = require "lpeg"
local http_patts = require "lpeg_patterns.http"
local uri_patts = require "lpeg_patterns.uri"
local basexx = require "basexx"
local client = require "http.client"
local new_headers = require "http.headers".new
local http_hsts = require "http.hsts"
local http_socks = require "http.socks"
local http_proxies = require "http.proxies"
local http_util = require "http.util"
local http_version = require "http.version"
local monotime = require "cqueues".monotime
local ce = require "cqueues.errno"
local default_user_agent = string.format("%s/%s", http_version.name, http_version.version)
local default_hsts_store = http_hsts.new_store()
local default_proxies = http_proxies.new():update()
local default_h2_settings = {
ENABLE_PUSH = false;
}
local request_methods = {
hsts = default_hsts_store;
proxies = default_proxies;
expect_100_timeout = 1;
follow_redirects = true;
max_redirects = 5;
post301 = false;
post302 = false;
}
local request_mt = {
__name = "http.request";
__index = request_methods;
}
local EOF = lpeg.P(-1)
local sts_patt = lpeg.Cf(lpeg.Ct(true) * http_patts.Strict_Transport_Security, rawset) * EOF
local uri_patt = uri_patts.uri * EOF
local uri_ref = uri_patts.uri_reference * EOF
local function new_from_uri(uri_t, headers)
if type(uri_t) == "string" then
uri_t = assert(uri_patt:match(uri_t), "invalid URI")
else
assert(type(uri_t) == "table")
end
local scheme = assert(uri_t.scheme, "URI missing scheme")
assert(scheme == "https" or scheme == "http" or scheme == "ws" or scheme == "wss", "scheme not valid")
local host = tostring(assert(uri_t.host, "URI must include a host")) -- tostring required to e.g. convert lpeg_patterns IPv6 objects
local port = uri_t.port or http_util.scheme_to_port[scheme]
local is_connect -- CONNECT requests are a bit special, see http2 spec section 8.3
if headers == nil then
headers = new_headers()
headers:append(":method", "GET")
is_connect = false
else
is_connect = headers:get(":method") == "CONNECT"
end
if is_connect then
assert(uri_t.path == nil or uri_t.path == "", "CONNECT requests cannot have a path")
assert(uri_t.query == nil, "CONNECT requests cannot have a query")
assert(headers:has(":authority"), ":authority required for CONNECT requests")
else
headers:upsert(":authority", http_util.to_authority(host, port, scheme))
local path = uri_t.path
if path == nil or path == "" then
path = "/"
end
if uri_t.query then
path = path .. "?" .. uri_t.query
end
headers:upsert(":path", path)
headers:upsert(":scheme", scheme)
end
if uri_t.userinfo then
local field
if is_connect then
field = "proxy-authorization"
else
field = "authorization"
end
local userinfo = http_util.decodeURIComponent(uri_t.userinfo) -- XXX: this doesn't seem right, but it's same behaviour as curl
headers:upsert(field, "basic " .. basexx.to_base64(userinfo), true)
end
if not headers:has("user-agent") then
headers:append("user-agent", default_user_agent)
end
return setmetatable({
host = host;
port = port;
tls = (scheme == "https" or scheme == "wss");
headers = headers;
body = nil;
}, request_mt)
end
local function new_connect(uri, connect_authority)
local headers = new_headers()
headers:append(":authority", connect_authority)
headers:append(":method", "CONNECT")
return new_from_uri(uri, headers)
end
function request_methods:clone()
return setmetatable({
host = self.host;
port = self.port;
bind = self.bind;
tls = self.tls;
ctx = self.ctx;
sendname = self.sendname;
version = self.version;
proxy = self.proxy;
headers = self.headers:clone();
body = self.body;
hsts = rawget(self, "hsts");
proxies = rawget(self, "proxies");
expect_100_timeout = rawget(self, "expect_100_timeout");
follow_redirects = rawget(self, "follow_redirects");
max_redirects = rawget(self, "max_redirects");
post301 = rawget(self, "post301");
post302 = rawget(self, "post302");
}, request_mt)
end
function request_methods:to_uri(with_userinfo)
local scheme = self.headers:get(":scheme")
local method = self.headers:get(":method")
local path
if scheme == nil then
scheme = self.tls and "https" or "http"
end
local authority
local authorization_field
if method == "CONNECT" then
authorization_field = "proxy-authorization"
path = ""
else
path = self.headers:get(":path")
local path_t
if method == "OPTIONS" and path == "*" then
path = ""
else
path_t = uri_ref:match(path)
assert(path_t, "path not a valid uri reference")
end
if path_t and path_t.host then
-- path was a full URI. This is used for proxied requests.
scheme = path_t.scheme or scheme
path = path_t.path or ""
if path_t.query then
path = path .. "?" .. path_t.query
end
authority = http_util.to_authority(path_t.host, path_t.port, scheme)
else
authority = self.headers:get(":authority")
-- TODO: validate authority can fit in a url
end
authorization_field = "authorization"
end
if authority == nil then
authority = http_util.to_authority(self.host, self.port, scheme)
end
if with_userinfo and self.headers:has(authorization_field) then
local authorization = self.headers:get(authorization_field)
local auth_type, userinfo = authorization:match("^%s*(%S+)%s+(%S+)%s*$")
if auth_type and auth_type:lower() == "basic" then
userinfo = basexx.from_base64(userinfo)
userinfo = http_util.encodeURI(userinfo)
authority = userinfo .. "@" .. authority
else
error("authorization cannot be converted to uri")
end
end
return scheme .. "://" .. authority .. path
end
function request_methods:handle_redirect(orig_headers)
local max_redirects = self.max_redirects
if max_redirects <= 0 then
return nil, "maximum redirects exceeded", ce.ELOOP
end
local location = orig_headers:get("location")
if not location then
return nil, "missing location header for redirect", ce.EINVAL
end
local uri_t = uri_ref:match(location)
if not uri_t then
return nil, "invalid URI in location header", ce.EINVAL
end
local new_req = self:clone()
new_req.max_redirects = max_redirects - 1
local method = new_req.headers:get(":method")
local is_connect = method == "CONNECT"
local new_scheme = uri_t.scheme
if new_scheme then
if not is_connect then
new_req.headers:upsert(":scheme", new_scheme)
end
if new_scheme == "https" or new_scheme == "wss" then
new_req.tls = true
elseif new_scheme == "http" or new_scheme == "ws" then
new_req.tls = false
else
return nil, "unknown scheme", ce.EINVAL
end
else
if not is_connect then
new_scheme = new_req.headers:get(":scheme")
end
if new_scheme == nil then
new_scheme = self.tls and "https" or "http"
end
end
local orig_target
local target_authority
if not is_connect then
orig_target = self.headers:get(":path")
orig_target = uri_ref:match(orig_target)
if orig_target and orig_target.host then
-- was originally a proxied request
local new_authority
if uri_t.host then -- we have a new host
new_authority = http_util.to_authority(uri_t.host, uri_t.port, new_scheme)
new_req.headers:upsert(":authority", new_authority)
else
new_authority = self.headers:get(":authority")
end
if new_authority == nil then
new_authority = http_util.to_authority(self.host, self.port, new_scheme)
end
-- prefix for new target
target_authority = new_scheme .. "://" .. new_authority
end
end
if target_authority == nil and uri_t.host then
-- we have a new host and it wasn't placed into :authority
new_req.host = uri_t.host
if not is_connect then
new_req.headers:upsert(":authority", http_util.to_authority(uri_t.host, uri_t.port, new_scheme))
end
new_req.port = uri_t.port or http_util.scheme_to_port[new_scheme]
new_req.sendname = nil
end -- otherwise same host as original request; don't need change anything
if is_connect then
if uri_t.path ~= nil and uri_t.path ~= "" then
return nil, "CONNECT requests cannot have a path", ce.EINVAL
elseif uri_t.query ~= nil then
return nil, "CONNECT requests cannot have a query", ce.EINVAL
end
else
local new_path
if uri_t.path == nil or uri_t.path == "" then
new_path = "/"
else
new_path = uri_t.path
if new_path:sub(1, 1) ~= "/" then -- relative path
if not orig_target then
return nil, "base path not valid for relative redirect", ce.EINVAL
end
local orig_path = orig_target.path or "/"
new_path = http_util.resolve_relative_path(orig_path, new_path)
end
end
if uri_t.query then
new_path = new_path .. "?" .. uri_t.query
end
if target_authority then
new_path = target_authority .. new_path
end
new_req.headers:upsert(":path", new_path)
end
if uri_t.userinfo then
local field
if is_connect then
field = "proxy-authorization"
else
field = "authorization"
end
new_req.headers:upsert(field, "basic " .. basexx.to_base64(uri_t.userinfo), true)
end
if not new_req.tls and self.tls then
--[[ RFC 7231 5.5.2: A user agent MUST NOT send a Referer header field in an
unsecured HTTP request if the referring page was received with a secure protocol.]]
new_req.headers:delete("referer")
else
new_req.headers:upsert("referer", self:to_uri(false))
end
-- Change POST requests to a body-less GET on redirect?
local orig_status = orig_headers:get(":status")
if (orig_status == "303"
or (orig_status == "301" and not self.post301)
or (orig_status == "302" and not self.post302)
) and method == "POST"
then
new_req.headers:upsert(":method", "GET")
-- Remove headers that don't make sense without a body
-- Headers that require a body
new_req.headers:delete("transfer-encoding")
new_req.headers:delete("content-length")
-- Representation Metadata from RFC 7231 Section 3.1
new_req.headers:delete("content-encoding")
new_req.headers:delete("content-language")
new_req.headers:delete("content-location")
new_req.headers:delete("content-type")
-- Other...
local expect = new_req.headers:get("expect")
if expect and expect:lower() == "100-continue" then
new_req.headers:delete("expect")
end
new_req.body = nil
end
return new_req
end
function request_methods:set_body(body)
self.body = body
local length
if type(self.body) == "string" then
length = #body
end
if length then
self.headers:upsert("content-length", string.format("%d", #body))
end
if not length or length > 1024 then
self.headers:append("expect", "100-continue")
end
return true
end
local function non_final_status(status)
return status:sub(1, 1) == "1" and status ~= "101"
end
function request_methods:go(timeout)
local deadline = timeout and (monotime()+timeout)
local cloned_headers = false -- only clone headers when we need to
local request_headers = self.headers
local host = self.host
local port = self.port
local tls = self.tls
-- RFC 6797 Section 8.3
if not tls and self.hsts and self.hsts:check(host) then
tls = true
if request_headers:get(":scheme") == "http" then
-- The UA MUST replace the URI scheme with "https"
if not cloned_headers then
request_headers = request_headers:clone()
cloned_headers = true
end
request_headers:upsert(":scheme", "https")
end
-- if the URI contains an explicit port component of "80", then
-- the UA MUST convert the port component to be "443", or
-- if the URI contains an explicit port component that is not
-- equal to "80", the port component value MUST be preserved
if port == 80 then
port = 443
end
end
local connection
local proxy = self.proxy
if proxy == nil and self.proxies then
assert(getmetatable(self.proxies) == http_proxies.mt, "proxies property should be an http.proxies object")
local scheme = tls and "https" or "http" -- rather than :scheme
proxy = self.proxies:choose(scheme, host)
end
if proxy then
if type(proxy) == "string" then
proxy = assert(uri_patt:match(proxy), "invalid proxy URI")
else
assert(type(proxy) == "table" and getmetatable(proxy) == nil and proxy.scheme, "invalid proxy URI")
end
if proxy.scheme == "http" or proxy.scheme == "https" then
if tls then
-- Proxy via a CONNECT request
local authority = http_util.to_authority(host, port, nil)
local connect_request = new_connect(proxy, authority)
connect_request.proxy = false
connect_request.version = 1.1 -- TODO: CONNECT over HTTP/2
if tls then
if connect_request.tls then
error("NYI: TLS over TLS")
end
end
-- Perform CONNECT request
local headers, stream, errno = connect_request:go(deadline and deadline-monotime())
if not headers then
return nil, stream, errno
end
-- RFC 7231 Section 4.3.6:
-- Any 2xx (Successful) response indicates that the sender (and all
-- inbound proxies) will switch to tunnel mode
local status_reply = headers:get(":status")
if status_reply:sub(1, 1) ~= "2" then
stream:shutdown()
return nil, ce.strerror(ce.ECONNREFUSED), ce.ECONNREFUSED
end
local sock = stream.connection:take_socket()
local err, errno2
connection, err, errno2 = client.negotiate(sock, {
tls = tls;
ctx = self.ctx;
sendname = self.sendname ~= nil and self.sendname or host;
version = self.version;
h2_settings = default_h2_settings;
}, deadline and deadline-monotime())
if connection == nil then
sock:close()
return nil, err, errno2
end
else
if request_headers:get(":method") == "CONNECT" then
error("cannot use HTTP Proxy with CONNECT method")
end
if proxy.path ~= nil and proxy.path ~= "" then
error("an HTTP proxy cannot have a path component")
end
-- TODO: Check if :path already has authority?
local old_url = self:to_uri(false)
host = assert(proxy.host, "proxy is missing host")
port = proxy.port or http_util.scheme_to_port[proxy.scheme]
-- proxy requests get a uri that includes host as their path
if not cloned_headers then
request_headers = request_headers:clone()
cloned_headers = true -- luacheck: ignore 311
end
request_headers:upsert(":path", old_url)
if proxy.userinfo then
request_headers:upsert("proxy-authorization", "basic " .. basexx.to_base64(proxy.userinfo), true)
end
end
elseif proxy.scheme:match "^socks" then
local socks = http_socks.connect(proxy)
local ok, err, errno = socks:negotiate(host, port, deadline and deadline-monotime())
if not ok then
return nil, err, errno
end
local sock = socks:take_socket()
connection, err, errno = client.negotiate(sock, {
tls = tls;
ctx = self.ctx;
sendname = self.sendname ~= nil and self.sendname or host;
version = self.version;
h2_settings = default_h2_settings;
}, deadline and deadline-monotime())
if connection == nil then
sock:close()
return nil, err, errno
end
else
error(string.format("unsupported proxy type (%s)", proxy.scheme))
end
end
if not connection then
local err, errno
connection, err, errno = client.connect({
host = host;
port = port;
bind = self.bind;
tls = tls;
ctx = self.ctx;
sendname = self.sendname;
version = self.version;
h2_settings = default_h2_settings;
}, deadline and deadline-monotime())
if connection == nil then
return nil, err, errno
end
-- Close the connection (and free resources) when done
connection:onidle(connection.close)
end
local stream do
local err, errno
stream, err, errno = connection:new_stream()
if stream == nil then
return nil, err, errno
end
end
local body = self.body
do -- Write outgoing headers
local ok, err, errno = stream:write_headers(request_headers, body == nil, deadline and deadline-monotime())
if not ok then
stream:shutdown()
return nil, err, errno
end
end
local headers
if body then
local expect = request_headers:get("expect")
if expect and expect:lower() == "100-continue" then
-- Try to wait for 100-continue before proceeding
if deadline then
local err, errno
headers, err, errno = stream:get_headers(math.min(self.expect_100_timeout, deadline-monotime()))
if headers == nil and (errno ~= ce.ETIMEDOUT or monotime() > deadline) then
stream:shutdown()
if err == nil then
return nil, ce.strerror(ce.EPIPE), ce.EPIPE
end
return nil, err, errno
end
else
local err, errno
headers, err, errno = stream:get_headers(self.expect_100_timeout)
if headers == nil and errno ~= ce.ETIMEDOUT then
stream:shutdown()
if err == nil then
return nil, ce.strerror(ce.EPIPE), ce.EPIPE
end
return nil, err, errno
end
end
if headers and headers:get(":status") ~= "100" then
-- Don't send body
body = nil
end
end
if body then
local ok, err, errno
if type(body) == "string" then
ok, err, errno = stream:write_body_from_string(body, deadline and deadline-monotime())
elseif io.type(body) == "file" then
ok, err, errno = body:seek("set")
if ok then
ok, err, errno = stream:write_body_from_file(body, deadline and deadline-monotime())
end
elseif type(body) == "function" then
-- call function to get body segments
while true do
local chunk = body()
if chunk then
ok, err, errno = stream:write_chunk(chunk, false, deadline and deadline-monotime())
if not ok then
break
end
else
ok, err, errno = stream:write_chunk("", true, deadline and deadline-monotime())
break
end
end
end
if not ok then
stream:shutdown()
return nil, err, errno
end
end
end
if not headers or non_final_status(headers:get(":status")) then
-- Skip through 1xx informational headers.
-- From RFC 7231 Section 6.2: "A user agent MAY ignore unexpected 1xx responses"
repeat
local err, errno
headers, err, errno = stream:get_headers(deadline and (deadline-monotime()))
if headers == nil then
stream:shutdown()
if err == nil then
return nil, ce.strerror(ce.EPIPE), ce.EPIPE
end
return nil, err, errno
end
until not non_final_status(headers:get(":status"))
end
-- RFC 6797 Section 8.1
if tls and self.hsts and headers:has("strict-transport-security") then
-- If a UA receives more than one STS header field in an HTTP
-- response message over secure transport, then the UA MUST process
-- only the first such header field.
local sts = headers:get("strict-transport-security")
sts = sts_patt:match(sts)
-- The UA MUST ignore any STS header fields not conforming to the grammar specified.
if sts then
self.hsts:store(self.host, sts)
end
end
if self.follow_redirects and headers:get(":status"):sub(1,1) == "3" then
stream:shutdown()
local new_req, err2, errno2 = self:handle_redirect(headers)
if not new_req then
return nil, err2, errno2
end
return new_req:go(deadline and (deadline-monotime()))
end
return headers, stream
end
return {
new_from_uri = new_from_uri;
new_connect = new_connect;
methods = request_methods;
mt = request_mt;
}