v/vlib/vweb/vweb.v

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// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
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module vweb
import (
os
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net
http
net.urllib
strings
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)
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const (
methods_with_form = ['POST', 'PUT', 'PATCH']
HEADER_SERVER = 'Server: VWeb\r\n'
HEADER_CONNECTION_CLOSE = 'Connection: close\r\n'
HEADERS_CLOSE = '${HEADER_SERVER}${HEADER_CONNECTION_CLOSE}\r\n'
HTTP_404 = 'HTTP/1.1 404 Not Found\r\nContent-Type: text/plain\r\n${HEADERS_CLOSE}404 Not Found'
HTTP_500 = 'HTTP/1.1 500 Internal Server Error\r\nContent-Type: text/plain\r\n${HEADERS_CLOSE}500 Internal Server Error'
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mime_types = {
'.css': 'text/css; charset=utf-8',
'.gif': 'image/gif',
'.htm': 'text/html; charset=utf-8',
'.html': 'text/html; charset=utf-8',
'.jpg': 'image/jpeg',
'.js': 'application/javascript',
'.wasm': 'application/wasm',
'.pdf': 'application/pdf',
'.png': 'image/png',
'.svg': 'image/svg+xml',
'.xml': 'text/xml; charset=utf-8'
}
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MAX_HTTP_POST_SIZE = 1024 * 1024
)
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pub struct Context {
static_files map[string]string
static_mime_types map[string]string
pub:
req http.Request
conn net.Socket
form map[string]string
// TODO Response
mut:
headers string // response headers
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done bool
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}
fn (ctx mut Context) send_response_to_client(mimetype string, res string) bool {
if ctx.done { return false }
ctx.done = true
mut sb := strings.new_builder(1024)
sb.write('HTTP/1.1 200 OK\r\nContent-Type: ') sb.write(mimetype)
sb.write('\r\nContent-Length: ') sb.write(res.len.str())
sb.write(ctx.headers)
sb.write('\r\n')
sb.write(HEADERS_CLOSE)
sb.write(res)
ctx.conn.send_string(sb.str()) or { return false }
sb.free()
return true
}
pub fn (ctx mut Context) html(s string) {
ctx.send_response_to_client('text/html', s)
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}
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pub fn (ctx mut Context) text(s string) {
ctx.send_response_to_client('text/plain', s)
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}
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pub fn (ctx mut Context) json(s string) {
ctx.send_response_to_client('application/json', s)
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}
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pub fn (ctx mut Context) redirect(url string) {
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if ctx.done { return }
ctx.done = true
ctx.conn.send_string('HTTP/1.1 302 Found\r\nLocation: ${url}${ctx.headers}\r\n${HEADERS_CLOSE}') or { return }
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}
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pub fn (ctx mut Context) not_found(s string) {
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if ctx.done { return }
ctx.done = true
ctx.conn.send_string(HTTP_404) or { return }
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}
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pub fn (ctx mut Context) set_cookie(key, val string) {
// TODO support directives, escape cookie value (https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie)
//println('Set-Cookie $key=$val')
ctx.add_header('Set-Cookie', '${key}=${val}; Secure; HttpOnly')
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}
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pub fn (ctx &Context) get_cookie(key string) ?string { // TODO refactor
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cookie_header := ' ' + ctx.get_header('cookie')
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cookie := if cookie_header.contains(';') {
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cookie_header.find_between(' $key=', ';')
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} else {
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cookie_header.find_between(' $key=', '\r')
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}
if cookie != '' {
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return cookie.trim_space()
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}
return error('Cookie not found')
}
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fn (ctx mut Context) add_header(key, val string) {
//println('add_header($key, $val)')
ctx.headers = ctx.headers + '\r\n$key: $val'
//println(ctx.headers)
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}
fn (ctx &Context) get_header(key string) string {
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return ctx.req.headers[key]
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}
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//pub fn run<T>(port int) {
pub fn run<T>(app mut T, port int) {
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println('Running vweb app on http://localhost:$port ...')
l := net.listen(port) or { panic('failed to listen') }
//mut app := T{}
app.init()
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for {
conn := l.accept() or { panic('accept() failed') }
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//foobar<T>()
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// TODO move this to handle_conn<T>(conn, app)
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message := readall(conn)
if message.len > MAX_HTTP_POST_SIZE {
println('message.len = $message.len > MAX_HTTP_POST_SIZE')
conn.send_string(HTTP_500) or {}
conn.close() or {}
continue
}
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lines := message.split_into_lines()
if lines.len < 2 {
conn.send_string(HTTP_500) or {}
conn.close() or {}
continue
}
first_line := strip(lines[0])
$if debug { println(first_line) }
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// Parse the first line
// "GET / HTTP/1.1"
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//first_line := s.all_before('\n')
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vals := first_line.split(' ')
if vals.len < 2 {
println('no vals for http')
conn.send_string(HTTP_500) or {}
conn.close() or {}
continue
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}
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mut headers := []string
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mut body := ''
mut in_headers := true
for line in lines[1..] {
sline := strip(line)
if sline == '' { in_headers = false }
if in_headers {
headers << sline
} else {
body += strip(sline) + '\r\n'
}
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}
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mut action := vals[1][1..].all_before('/')
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if action.contains('?') {
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action = action.all_before('?')
}
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if action == '' {
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action = 'index'
}
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req := http.Request{
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headers: http.parse_headers(headers) //s.split_into_lines())
ws_func: 0
user_ptr: 0
method: vals[0]
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url: vals[1]
}
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$if debug {
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println('req.headers = ')
println(req.headers)
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println('vweb action = "$action"')
}
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//mut app := T{
app.vweb = Context{
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req: req
conn: conn
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form: map[string]string
static_files: map[string]string
static_mime_types: map[string]string
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}
//}
if req.method in methods_with_form {
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body = strip(body)
app.vweb.parse_form(body)
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}
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if vals.len < 2 {
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$if debug {
println('no vals for http')
}
conn.close() or {}
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continue
}
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// Serve a static file if it's one
// if app.vweb.handle_static() {
// conn.close()
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// continue
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// }
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// Call the right action
$if debug {
println('action=$action')
}
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app.$action() or {
conn.send_string(HTTP_404) or {}
}
conn.close() or {}
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reset := 'reset'
app.$reset()
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}
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}
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fn (ctx mut Context) parse_form(s string) {
if !(ctx.req.method in methods_with_form) {
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return
}
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//pos := s.index('\r\n\r\n')
//if pos > -1 {
mut str_form := s//[pos..s.len]
str_form = str_form.replace('+', ' ')
words := str_form.split('&')
for word in words {
$if debug {
println('parse form keyval="$word"')
}
keyval := word.trim_space().split('=')
if keyval.len != 2 { continue }
key := keyval[0]
val := urllib.query_unescape(keyval[1]) or {
continue
}
$if debug {
println('http form "$key" => "$val"')
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}
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ctx.form[key] = val
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}
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//}
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// todo: parse form-data and application/json
// ...
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}
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fn (ctx mut Context) scan_static_directory(directory_path, mount_path string) {
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files := os.ls(directory_path) or { panic(err) }
if files.len > 0 {
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for file in files {
mut ext := ''
mut i := file.len
mut flag := true
for i > 0 {
i--
if flag {
ext = file[i..i + 1] + ext
}
if file[i..i + 1] == '.' {
flag = false
}
}
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// todo: os.is_dir is broken now so we expect that file is dir it has no extension
// if flag {
if os.is_dir(file) {
ctx.scan_static_directory(directory_path + '/' + file, mount_path + '/' + file)
} else {
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ctx.static_files[mount_path + '/' + file] = directory_path + '/' + file
ctx.static_mime_types[mount_path + '/' + file] = mime_types[ext]
}
}
}
}
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pub fn (ctx mut Context) handle_static(directory_path string) bool {
if ctx.done { return false }
ctx.scan_static_directory(directory_path, '')
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static_file := ctx.static_files[ctx.req.url]
mime_type := ctx.static_mime_types[ctx.req.url]
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if static_file != '' {
data := os.read_file(static_file) or { return false }
return ctx.send_response_to_client(mime_type, data)
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}
return false
}
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pub fn (ctx mut Context) serve_static(url, file_path, mime_type string) {
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ctx.static_files[url] = file_path
ctx.static_mime_types[url] = mime_type
}
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fn readall(conn net.Socket) string {
// read all message from socket
mut message := ''
buf := [1024]byte
for {
n := C.recv(conn.sockfd, buf, 1024, 2)
m := conn.crecv(buf, 1024)
message += string( byteptr(buf), m )
if message.len > MAX_HTTP_POST_SIZE { break }
if n == m { break }
}
return message
}
fn strip(s string) string {
// strip('\nabc\r\n') => 'abc'
return s.trim('\r\n')
}