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v/vlib/net/http/request.v

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V

// Copyright (c) 2019-2022 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module http
import io
import net
import net.urllib
import rand
import strings
import time
// Request holds information about an HTTP request (either received by
// a server or to be sent by a client)
pub struct Request {
pub mut:
version Version = .v1_1
method Method
header Header
cookies map[string]string
data string
url string
user_agent string = 'v.http'
verbose bool
user_ptr voidptr
// NOT implemented for ssl connections
// time = -1 for no timeout
read_timeout i64 = 30 * time.second
write_timeout i64 = 30 * time.second
//
validate bool // when true, certificate failures will stop further processing
verify string
cert string
cert_key string
in_memory_verification bool // if true, verify, cert, and cert_key are read from memory, not from a file
allow_redirect bool = true // whether to allow redirect
}
fn (mut req Request) free() {
unsafe { req.header.free() }
}
// add_header adds the key and value of an HTTP request header
// To add a custom header, use add_custom_header
pub fn (mut req Request) add_header(key CommonHeader, val string) {
req.header.add(key, val)
}
// add_custom_header adds the key and value of an HTTP request header
// This method may fail if the key contains characters that are not permitted
pub fn (mut req Request) add_custom_header(key string, val string) ? {
return req.header.add_custom(key, val)
}
// do will send the HTTP request and returns `http.Response` as soon as the response is recevied
pub fn (req &Request) do() ?Response {
mut url := urllib.parse(req.url) or { return error('http.Request.do: invalid url $req.url') }
mut rurl := url
mut resp := Response{}
mut no_redirects := 0
for {
if no_redirects == max_redirects {
return error('http.request.do: maximum number of redirects reached ($max_redirects)')
}
qresp := req.method_and_url_to_response(req.method, rurl) ?
resp = qresp
if !req.allow_redirect {
break
}
if resp.status() !in [.moved_permanently, .found, .see_other, .temporary_redirect,
.permanent_redirect] {
break
}
// follow any redirects
mut redirect_url := resp.header.get(.location) or { '' }
if redirect_url.len > 0 && redirect_url[0] == `/` {
url.set_path(redirect_url) or {
return error('http.request.do: invalid path in redirect: "$redirect_url"')
}
redirect_url = url.str()
}
qrurl := urllib.parse(redirect_url) or {
return error('http.request.do: invalid URL in redirect "$redirect_url"')
}
rurl = qrurl
no_redirects++
}
return resp
}
fn (req &Request) method_and_url_to_response(method Method, url urllib.URL) ?Response {
host_name := url.hostname()
scheme := url.scheme
p := url.escaped_path().trim_left('/')
path := if url.query().len > 0 { '/$p?$url.query().encode()' } else { '/$p' }
mut nport := url.port().int()
if nport == 0 {
if scheme == 'http' {
nport = 80
}
if scheme == 'https' {
nport = 443
}
}
// println('fetch $method, $scheme, $host_name, $nport, $path ')
if scheme == 'https' {
// println('ssl_do( $nport, $method, $host_name, $path )')
res := req.ssl_do(nport, method, host_name, path) ?
return res
} else if scheme == 'http' {
// println('http_do( $nport, $method, $host_name, $path )')
res := req.http_do('$host_name:$nport', method, path) ?
return res
}
return error('http.request.method_and_url_to_response: unsupported scheme: "$scheme"')
}
fn (req &Request) build_request_headers(method Method, host_name string, path string) string {
ua := req.user_agent
mut uheaders := []string{}
if !req.header.contains(.host) {
uheaders << 'Host: $host_name\r\n'
}
if !req.header.contains(.user_agent) {
uheaders << 'User-Agent: $ua\r\n'
}
if req.data.len > 0 && !req.header.contains(.content_length) {
uheaders << 'Content-Length: $req.data.len\r\n'
}
for key in req.header.keys() {
if key == CommonHeader.cookie.str() {
continue
}
val := req.header.custom_values(key).join('; ')
uheaders << '$key: $val\r\n'
}
uheaders << req.build_request_cookies_header()
version := if req.version == .unknown { Version.v1_1 } else { req.version }
return '$method $path $version\r\n' + uheaders.join('') + 'Connection: close\r\n\r\n' + req.data
}
fn (req &Request) build_request_cookies_header() string {
if req.cookies.keys().len < 1 {
return ''
}
mut cookie := []string{}
for key, val in req.cookies {
cookie << '$key=$val'
}
cookie << req.header.values(.cookie)
return 'Cookie: ' + cookie.join('; ') + '\r\n'
}
fn (req &Request) http_do(host string, method Method, path string) ?Response {
host_name, _ := net.split_address(host) ?
s := req.build_request_headers(method, host_name, path)
mut client := net.dial_tcp(host) ?
client.set_read_timeout(req.read_timeout)
client.set_write_timeout(req.write_timeout)
// TODO this really needs to be exposed somehow
client.write(s.bytes()) ?
$if trace_http_request ? {
eprintln('> $s')
}
mut bytes := io.read_all(reader: client) ?
client.close() ?
response_text := bytes.bytestr()
$if trace_http_response ? {
eprintln('< $response_text')
}
return parse_response(response_text)
}
// referer returns 'Referer' header value of the given request
pub fn (req &Request) referer() string {
return req.header.get(.referer) or { '' }
}
// Parse a raw HTTP request into a Request object
pub fn parse_request(mut reader io.BufferedReader) ?Request {
// request line
mut line := reader.read_line() ?
method, target, version := parse_request_line(line) ?
// headers
mut header := new_header()
line = reader.read_line() ?
for line != '' {
key, value := parse_header(line) ?
header.add_custom(key, value) ?
line = reader.read_line() ?
}
header.coerce(canonicalize: true)
// body
mut body := []byte{}
if length := header.get(.content_length) {
n := length.int()
if n > 0 {
body = []byte{len: n}
mut count := 0
for count < body.len {
count += reader.read(mut body[count..]) or { break }
}
}
}
return Request{
method: method
url: target.str()
header: header
data: body.bytestr()
version: version
}
}
fn parse_request_line(s string) ?(Method, urllib.URL, Version) {
words := s.split(' ')
if words.len != 3 {
return error('malformed request line')
}
method := method_from_str(words[0])
target := urllib.parse(words[1]) ?
version := version_from_str(words[2])
if version == .unknown {
return error('unsupported version')
}
return method, target, version
}
// Parse URL encoded key=value&key=value forms
//
// FIXME: Some servers can require the
// parameter in a specific order.
//
// a possible solution is to use the a list of QueryValue
pub fn parse_form(body string) map[string]string {
words := body.split('&')
mut form := map[string]string{}
for word in words {
kv := word.split_nth('=', 2)
if kv.len != 2 {
continue
}
key := urllib.query_unescape(kv[0]) or { continue }
val := urllib.query_unescape(kv[1]) or { continue }
form[key] = val
}
return form
// }
// todo: parse form-data and application/json
// ...
}
pub struct FileData {
pub:
filename string
content_type string
data string
}
pub struct UnexpectedExtraAttributeError {
Error
attributes []string
}
pub fn (err UnexpectedExtraAttributeError) msg() string {
return 'Encountered unexpected extra attributes: $err.attributes'
}
pub struct MultiplePathAttributesError {
Error
}
pub fn (err MultiplePathAttributesError) msg() string {
return 'Expected at most one path attribute'
}
// multipart_form_body converts form and file data into a multipart/form
// HTTP request body. It is the inverse of parse_multipart_form. Returns
// (body, boundary).
// NB: Form keys should not contain quotes
fn multipart_form_body(form map[string]string, files map[string][]FileData) (string, string) {
alpha_numeric := 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789'
boundary := rand.string_from_set(alpha_numeric, 64)
mut sb := strings.new_builder(1024)
for name, value in form {
sb.write_string('\r\n--')
sb.write_string(boundary)
sb.write_string('\r\nContent-Disposition: form-data; name="')
sb.write_string(name)
sb.write_string('"\r\n\r\n')
sb.write_string(value)
}
for name, fs in files {
for f in fs {
sb.write_string('\r\n--')
sb.write_string(boundary)
sb.write_string('\r\nContent-Disposition: form-data; name="')
sb.write_string(name)
sb.write_string('"; filename="')
sb.write_string(f.filename)
sb.write_string('"\r\nContent-Type: ')
sb.write_string(f.content_type)
sb.write_string('\r\n\r\n')
sb.write_string(f.data)
}
}
sb.write_string('\r\n--')
sb.write_string(boundary)
sb.write_string('--')
return sb.str(), boundary
}
struct LineSegmentIndexes {
mut:
start int
end int
}
// parse_multipart_form parses an http request body, given a boundary string
// For more details about multipart forms, see:
// https://datatracker.ietf.org/doc/html/rfc2183
// https://datatracker.ietf.org/doc/html/rfc2388
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Disposition
pub fn parse_multipart_form(body string, boundary string) (map[string]string, map[string][]FileData) {
// dump(body)
// dump(boundary)
mut form := map[string]string{}
mut files := map[string][]FileData{}
// TODO: do not use split, but only indexes, to reduce copying of potentially large data
sections := body.split(boundary)
fields := sections[1..sections.len - 1]
for field in fields {
mut line_segments := []LineSegmentIndexes{cap: 100}
mut line_idx, mut line_start := 0, 0
for cidx, c in field {
if line_idx >= 6 {
// no need to scan further
break
}
if c == `\n` {
line_segments << LineSegmentIndexes{line_start, cidx}
line_start = cidx + 1
line_idx++
}
}
line_segments << LineSegmentIndexes{line_start, field.len}
line1 := field[line_segments[1].start..line_segments[1].end]
line2 := field[line_segments[2].start..line_segments[2].end]
disposition := parse_disposition(line1.trim_space())
// Grab everything between the double quotes
name := disposition['name'] or { continue }
// Parse files
// TODO: handle `filename*`, see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Disposition
if filename := disposition['filename'] {
// reject early broken content
if line_segments.len < 5 {
continue
}
// reject early non Content-Type headers
if !line2.to_lower().starts_with('content-type:') {
continue
}
content_type := line2.split_nth(':', 2)[1].trim_space()
// line1: Content-Disposition: form-data; name="upfile"; filename="photo123.jpg"
// line2: Content-Type: image/jpeg
// line3:
// line4: DATA
// ...
// lineX: --
data := field[line_segments[4].start..field.len - 4] // each multipart field ends with \r\n--
// dump(data.limit(20).bytes())
// dump(data.len)
files[name] << FileData{
filename: filename
content_type: content_type
data: data
}
continue
}
if line_segments.len < 4 {
continue
}
form[name] = field[line_segments[3].start..field.len - 4]
}
// dump(form)
return form, files
}
// Parse the Content-Disposition header of a multipart form
// Returns a map of the key="value" pairs
// Example: assert parse_disposition('Content-Disposition: form-data; name="a"; filename="b"') == {'name': 'a', 'filename': 'b'}
fn parse_disposition(line string) map[string]string {
mut data := map[string]string{}
for word in line.split(';') {
kv := word.split_nth('=', 2)
if kv.len != 2 {
continue
}
key, value := kv[0].to_lower().trim_left(' \t'), kv[1]
if value.starts_with('"') && value.ends_with('"') {
data[key] = value[1..value.len - 1]
} else {
data[key] = value
}
}
return data
}