v/vlib/vweb/vweb.v

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// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
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// 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
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import os
import net
import net.http
import net.urllib
import strings
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pub const (
methods_with_form = ['POST', 'PUT', 'PATCH']
method_all = ['GET','POST','PUT','PATCH','DELETE']
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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
default_port = 8080
)
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pub struct Context {
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mut:
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static_files map[string]string
static_mime_types map[string]string
pub:
req http.Request
conn net.Socket
// TODO Response
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pub mut:
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form map[string]string
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headers string // response headers
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done bool
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}
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fn (mut ctx 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')
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sb.write(headers_close)
sb.write(res)
ctx.conn.send_string(sb.str()) or { return false }
sb.free()
return true
}
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pub fn (mut ctx Context) html(s string) {
ctx.send_response_to_client('text/html', s)
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}
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pub fn (mut ctx Context) text(s string) {
ctx.send_response_to_client('text/plain', s)
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}
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pub fn (mut ctx Context) json(s string) {
ctx.send_response_to_client('application/json', s)
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}
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pub fn (mut ctx Context) redirect(url string) {
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if ctx.done { return }
ctx.done = true
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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 (mut ctx Context) not_found(s string) {
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if ctx.done { return }
ctx.done = true
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ctx.conn.send_string(http_404) or { return }
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}
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pub fn (mut ctx 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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mut cookie_header := ctx.get_header('cookie')
if cookie_header == '' {
cookie_header = ctx.get_header('Cookie')
}
cookie_header = ' ' + cookie_header
//println('cookie_header="$cookie_header"')
//println(ctx.req.headers)
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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(' $key=', '\r')
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}
if cookie != '' {
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return cookie.trim_space()
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}
return error('Cookie not found')
}
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pub fn (mut ctx Context) add_header(key, val string) {
//println('add_header($key, $val)')
ctx.headers = ctx.headers + '\r\n$key: $val'
//println(ctx.headers)
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}
pub fn (ctx &Context) get_header(key string) string {
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return ctx.req.headers[key]
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}
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//fn handle_conn(conn net.Socket) {
//println('handle')
//}
pub fn foo<T>() {
}
pub fn run<T>(port int) {
//pub fn run<T>(app mut T, port int) {
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println('Running a Vweb app on http://localhost:$port ...')
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l := net.listen(port) or { panic('failed to listen') }
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mut app := T{}
app.vweb = Context{}
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app.init()
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//app.reset()
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for {
conn := l.accept() or { panic('accept() failed') }
handle_conn<T>(conn, mut app)
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//foobar<T>()
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// TODO move this to handle_conn<T>(conn, app)
//message := readall(conn)
//println(message)
/*
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if message.len > max_http_post_size {
println('message.len = $message.len > max_http_post_size')
conn.send_string(http_500) or {}
conn.close() or {}
continue
}
*/
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//lines := message.split_into_lines()
//println(lines)
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/*
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if lines.len < 2 {
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conn.send_string(http_500) or {}
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conn.close() or {}
continue
}
*/
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}
}
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fn handle_conn<T>(conn net.Socket, app mut T) {
//first_line := strip(lines[0])
first_line := conn.read_line()
println('firstline="$first_line"')
$if debug { println(first_line) }
// Parse the first line
// "GET / HTTP/1.1"
//first_line := s.all_before('\n')
vals := first_line.split(' ')
if vals.len < 2 {
println('no vals for http')
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conn.send_string(http_500) or {}
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conn.close() or {}
return
//continue
}
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mut headers := []string{}
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mut body := ''
mut in_headers := true
mut len := 0
mut body_len := 0
//for line in lines[1..] {
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for _ in 0..100 {
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//println(j)
line := conn.read_line()
sline := strip(line)
if sline == '' {
//if in_headers {
// End of headers, no body => exit
if len == 0 {
break
}
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//} //else {
// End of body
//break
//}
//println('HHH')
in_headers = false
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}
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if in_headers {
//println(sline)
headers << sline
if sline.starts_with('Content-Length') {
len = sline.all_after(': ').int()
//println('GOT CL=$len')
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}
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} else {
body += sline + '\r\n'
body_len += body.len
if body_len >= len {
break
}
//println('body:$body')
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}
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}
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mut action := vals[1][1..].all_before('/')
if action.contains('?') {
action = action.all_before('?')
}
if action == '' {
action = 'index'
}
req := http.Request{
headers: http.parse_headers(headers) //s.split_into_lines())
data: strip(body)
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ws_func: 0
user_ptr: 0
method: vals[0]
url: vals[1]
}
$if debug {
println('req.headers = ')
println(req.headers)
println('req.data="$req.data"' )
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println('vweb action = "$action"')
}
//mut app := T{
app.vweb = Context{
req: req
conn: conn
form: map[string]string
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static_files: app.vweb.static_files
static_mime_types: app.vweb.static_mime_types
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}
//}
if req.method in methods_with_form {
app.vweb.parse_form(req.data)
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}
if vals.len < 2 {
$if debug {
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println('no vals for http')
}
conn.close() or {}
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return
//continue
}
// Serve a static file if it's one
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static_file := app.vweb.static_files[app.vweb.req.url]
mime_type := app.vweb.static_mime_types[app.vweb.req.url]
if static_file != '' && mime_type != '' {
data := os.read_file(static_file) or {
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conn.send_string(http_404) or {}
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return
}
app.vweb.send_response_to_client(mime_type, data)
return
}
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// Call the right action
$if debug {
println('action=$action')
}
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app.$action()
/*
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app.$action() or {
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conn.send_string(http_404) or {}
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}
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*/
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conn.close() or {}
app.reset()
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}
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fn (mut ctx 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 (mut ctx Context) scan_static_directory(directory_path, mount_path string) {
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files := os.ls(directory_path) or { panic(err) }
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if files.len > 0 {
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for file in files {
if os.is_dir(file) {
ctx.scan_static_directory(directory_path + '/' + file, mount_path + '/' + file)
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} else if file.contains('.') && ! file.starts_with('.') && ! file.ends_with('.') {
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ext := os.file_ext(file)
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// Rudimentary guard against adding files not in mime_types.
// Use serve_static directly to add non-standard mime types.
if ext in mime_types {
ctx.serve_static(mount_path + '/' + file, directory_path + '/' + file, mime_types[ext])
}
}
}
}
}
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pub fn (mut ctx Context) handle_static(directory_path string) bool {
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if ctx.done || ! os.exists(directory_path) {
return false
}
dir_path := directory_path.trim_space().trim_right('/')
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mut mount_path := ''
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if dir_path != '.' && os.is_dir(dir_path) {
// Mount point hygene, "./assets" => "/assets".
mount_path = '/' + dir_path.trim_left('.').trim('/')
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}
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ctx.scan_static_directory(dir_path, mount_path)
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return true
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}
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pub fn (mut ctx 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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/*
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fn readall(conn net.Socket) string {
// read all message from socket
//printf("waitall=%d\n", C.MSG_WAITALL)
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mut message := ''
buf := [1024]byte
for {
n := C.recv(conn.sockfd, buf, 1024, 0)
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m := conn.crecv(buf, 1024)
message += string( byteptr(buf), m )
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if message.len > max_http_post_size { break }
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if n == m { break }
}
return message
}
*/
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fn strip(s string) string {
// strip('\nabc\r\n') => 'abc'
return s.trim('\r\n')
}