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
)
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const (
methods_with_form = ['POST', 'PUT', 'PATCH']
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HEADER_SERVER = 'Server: VWeb\r\n' // TODO add to the headers
HTTP_404 = 'HTTP/1.1 404 Not Found\r\nContent-Type: text/plain\r\n\r\n404 Not Found'
HTTP_500 = 'HTTP/1.1 500 Internal Server Error\r\nContent-Type: text/plain\r\n\r\n500 Internal Server Error'
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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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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}
pub fn (ctx Context) html(html string) {
ctx.conn.write('HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n$ctx.headers\r\n\r\n$html')
}
pub fn (ctx Context) text(s string) {
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ctx.conn.write('HTTP/1.1 200 OK\r\nContent-Type: text/plain\r\n$ctx.headers\r\n\r\n $s')
}
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pub fn (ctx Context) json(s string) {
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ctx.conn.write('HTTP/1.1 200 OK\r\nContent-Type: application/json\r\n$ctx.headers\r\n\r\n$s')
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}
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pub fn (ctx Context) redirect(url string) {
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ctx.conn.write('HTTP/1.1 302 Found\r\nLocation: $url\r\n\r\n$ctx.headers')
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}
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pub fn (ctx Context) not_found(s string) {
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ctx.conn.write(HTTP_404)
}
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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)
ctx.add_header('Set-Cookie', '$key=$val')
}
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pub fn (ctx mut Context) get_cookie(key string) ?string { // TODO refactor
cookie_header := ctx.get_header('Cookie')
cookie := if cookie_header.contains(';') {
cookie_header.find_between('$key=', ';')
} else {
cookie_header
}
if cookie != '' {
return cookie
}
return error('Cookie not found')
}
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fn (ctx mut Context) add_header(key, val string) {
ctx.headers = ctx.headers + if ctx.headers == '' { '$key: val' } else { '\r\n$key: val' }
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}
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fn (ctx mut Context) get_header(key string) string {
return ctx.headers.find_between('\r\n$key: ', '\r\n')
}
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//pub fn run<T>(port int) {
pub fn run<T>(app T, port int) {
println('Running vweb app on http://localhost:$port ...')
l := net.listen(port) or { panic('failed to listen') }
//mut app := T{}
app.init()
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for {
conn := l.accept() or {
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panic('accept() failed')
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}
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//foobar<T>()
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// TODO move this to handle_conn<T>(conn, app)
s := conn.read_line()
if s == '' {
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conn.write(HTTP_500)
conn.close()
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return
}
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// Parse the first line
// "GET / HTTP/1.1"
first_line := s.all_before('\n')
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vals := first_line.split(' ')
if vals.len < 2 {
println('no vals for http')
conn.write(HTTP_500)
conn.close()
return
}
mut action := vals[1][1..].all_before('/')
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if action.contains('?') {
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action = action.all_before('?')
}
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if action == '' {
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action = 'index'
}
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req := http.Request{
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headers: http.parse_headers(s.split_into_lines())
ws_func: 0
user_ptr: 0
method: vals[0]
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url: vals[1]
}
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$if debug {
println('vweb action = "$action"')
}
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//mut app := T{
app.vweb = Context{
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req: req
conn: conn
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form: map[string]string
static_files: map[string]string
static_mime_types: map[string]string
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}
//}
if req.method in methods_with_form {
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app.vweb.parse_form(s)
}
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if vals.len < 2 {
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$if debug {
println('no vals for http')
}
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conn.close()
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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
app.$action() or {
conn.write(HTTP_404)
}
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conn.close()
}
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}
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pub fn foobar<T>() {
}
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fn (ctx mut Context) parse_form(s string) {
if !(ctx.req.method in methods_with_form) {
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return
}
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pos := s.index('\r\n\r\n')
if pos > -1 {
mut str_form := s[pos..s.len]
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str_form = str_form.replace('+', ' ')
words := str_form.split('&')
for word in words {
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$if debug {
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println('parse form keyval="$word"')
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}
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keyval := word.trim_space().split('=')
if keyval.len != 2 { continue }
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key := keyval[0]
val := urllib.query_unescape(keyval[1]) or {
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continue
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}
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$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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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 {
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 {
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 }
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ctx.conn.write('HTTP/1.1 200 OK\r\nContent-Type: $mime_type\r\n\r\n$data')
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return true
}
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
}