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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import time
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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',
'.md': 'text/markdown; charset=utf-8',
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'.pdf': 'application/pdf',
'.png': 'image/png',
'.svg': 'image/svg+xml',
'.txt': 'text/plain; charset=utf-8',
'.wasm': 'application/wasm',
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'.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
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content_type string = 'text/plain'
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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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query map[string]string
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headers string // response headers
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done bool
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page_gen_start i64
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form_error string
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}
pub struct Cookie {
name string
value string
expires time.Time
secure bool
http_only bool
}
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pub struct Result {}
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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)
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defer { sb.free() }
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)
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s := sb.str()
defer {
s.free()
}
ctx.conn.send_string(s) or { return false }
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) Result {
ctx.send_response_to_client('text/plain', s)
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return Result{}
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}
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pub fn (mut ctx Context) json(s string) Result {
ctx.send_response_to_client('application/json', s)
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return Result{}
}
pub fn (mut ctx Context) ok(s string) Result {
ctx.send_response_to_client(ctx.content_type, s)
return Result{}
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}
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pub fn (mut ctx Context) redirect(url string) Result {
if ctx.done { return Result{} }
ctx.done = true
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ctx.conn.send_string('HTTP/1.1 302 Found\r\nLocation: ${url}${ctx.headers}\r\n${headers_close}') or { return Result{} }
return Result{}
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}
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pub fn (mut ctx Context) not_found() Result {
if ctx.done { return vweb.Result{} }
ctx.done = true
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ctx.conn.send_string(http_404) or {}
return vweb.Result{}
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}
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pub fn (mut ctx Context) set_cookie(cookie Cookie) {
mut cookie_data := []string{}
mut secure := if cookie.secure { "Secure;" } else { "" }
secure += if cookie.http_only { " HttpOnly" } else { " " }
cookie_data << secure
if cookie.expires.unix > 0 {
cookie_data << 'expires=${cookie.expires.utc_string()}'
}
data := cookie_data.join(' ')
ctx.add_header('Set-Cookie', '$cookie.name=$cookie.value; $data')
}
pub fn (mut ctx Context) set_cookie_old(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')
ctx.add_header('Set-Cookie', '${key}=${val}; HttpOnly')
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}
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pub fn (mut ctx Context) set_content_type(typ string) {
ctx.content_type = typ
}
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pub fn (mut ctx Context) set_cookie_with_expire_date(key, val string, expire_date time.Time) {
ctx.add_header('Set-Cookie', '$key=$val; Secure; HttpOnly; expires=${expire_date.utc_string()}')
}
pub fn (ctx &Context) get_cookie(key string) ?string { // TODO refactor
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mut cookie_header := ctx.get_header('cookie')
if cookie_header == '' {
cookie_header = ctx.get_header('Cookie')
}
cookie_header = ' ' + cookie_header
//println('cookie_header="$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: $val'
//println(ctx.headers)
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}
pub fn (ctx &Context) get_header(key string) string {
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return ctx.req.headers[key]
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}
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//fn handle_conn(conn net.Socket) {
//println('handle')
//}
pub fn run<T>(port int) {
mut app := T{}
run_app<T>(mut app, port)
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}
pub fn run_app<T>(mut app T, port int) {
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println('Running a Vweb app on http://localhost:$port')
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l := net.listen(port) or { panic('failed to listen') }
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app.vweb = Context{}
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app.init_once()
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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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handle_conn<T>(conn, mut app)
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//app.vweb.page_gen_time = time.ticks() - t
//eprintln('handle conn() took ${time.ticks()-t}ms')
//message := readall(conn)
//println(message)
/*
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if message.len > max_http_post_size {
println('message.len = $message.len > max_http_post_size')
conn.send_string(http_500) or {}
conn.close() or {}
continue
}
*/
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//lines := message.split_into_lines()
//println(lines)
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/*
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if lines.len < 2 {
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conn.send_string(http_500) or {}
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conn.close() or {}
continue
}
*/
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}
}
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fn handle_conn<T>(conn net.Socket, mut app T) {
defer { conn.close() or {} }
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//fn handle_conn<T>(conn net.Socket, app_ T) T {
//mut app := app_
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//first_line := strip(lines[0])
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page_gen_start := time.ticks()
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first_line := conn.read_line()
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$if debug {
println('firstline="$first_line"')
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}
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// Parse the first line
// "GET / HTTP/1.1"
//first_line := s.all_before('\n')
vals := first_line.split(' ')
if vals.len < 2 {
println('no vals for http')
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conn.send_string(http_500) or {}
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return
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//continue
}
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mut headers := []string{}
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mut body := ''
mut in_headers := true
mut len := 0
mut body_len := 0
//for line in lines[1..] {
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for _ in 0..100 {
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//println(j)
line := conn.read_line()
sline := strip(line)
if sline == '' {
//if in_headers {
// End of headers, no body => exit
if len == 0 {
break
}
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//} //else {
// End of body
//break
//}
in_headers = false
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}
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if in_headers {
//println(sline)
headers << sline
if sline.starts_with('Content-Length') {
len = sline.all_after(': ').int()
//println('GOT CL=$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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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"' )
//println('vweb action = "$action"')
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}
//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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page_gen_start: page_gen_start
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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')
}
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return
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//continue
}
// Serve a static file if it is one
// TODO: handle url parameters properly - for now, ignore them
mut static_file_name := app.vweb.req.url
if static_file_name.contains('?') {
static_file_name = static_file_name.all_before('?')
}
static_file := app.vweb.static_files[static_file_name]
mime_type := app.vweb.static_mime_types[static_file_name]
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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
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}
app.vweb.send_response_to_client(mime_type, data)
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data.free()
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return
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}
app.init()
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// Call the right action
println('route matching...')
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//t := time.ticks()
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//mut action := ''
mut route_words := []string{}
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mut url_words := vals[1][1..].split('/').filter(it != '')
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if url_words.len == 0 {
app.index()
return
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} else {
// Parse URL query
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if url_words.last().contains('?') {
tmp_query := url_words.last().all_after('?').split('&').map(it.split('='))
url_words[url_words.len - 1] = url_words.last().all_before('?')
for data in tmp_query {
if data.len == 2 {
app.vweb.query[data[0]] = data[1]
}
}
}
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}
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mut vars := []string{cap: route_words.len}
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mut action := ''
$for method in T {
if attrs == '' {
// No routing for this method. If it matches, call it and finish matching
// since such methods have a priority.
// For example URL `/register` matches route `/:user`, but `fn register()`
// should be called first.
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if (req.method == 'GET' && url_words[0] == method && url_words.len == 1) || (req.method == 'POST' && url_words[0] + '_post' == method) {
println('easy match method=$method')
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app.$method(vars)
return
}
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} else {
route_words = attrs[1..].split('/')
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if url_words.len == route_words.len || (url_words.len >= route_words.len - 1 && route_words.last().ends_with('...')) {
// match `/:user/:repo/tree` to `/vlang/v/tree`
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mut matching := false
mut unknown := false
mut variables := []string{cap: route_words.len}
for i in 0..route_words.len {
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if url_words.len == i {
variables << ''
matching = true
unknown = true
break
}
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if url_words[i] == route_words[i] {
// no parameter
matching = true
continue
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} else if route_words[i].starts_with(':') {
// is parameter
if i < route_words.len && !route_words[i].ends_with('...') {
// normal parameter
variables << url_words[i]
} else {
// array parameter only in the end
variables << url_words[i..].join('/')
}
matching = true
unknown = true
continue
} else {
matching = false
break
}
}
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if matching && !unknown {
// absolute router words like `/test/site`
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app.$method(vars)
return
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} else if matching && unknown {
// router words with paramter like `/:test/site`
action = method
vars = variables
}
}
}
}
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if action == '' {
// site not found
conn.send_string(http_404) or {}
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return
}
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send_action<T>(action, vars, mut app)
}
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fn send_action<T>(action string, vars []string, mut app T) {
// TODO remove this function
$for method in T {
// search again for method
if action == method && attrs != '' {
// call action method
app.$method(vars)
}
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}
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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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pub fn (ctx &Context) ip() string {
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mut ip := ctx.req.headers['X-Forwarded-For']
if ip == '' {
ip = ctx.req.headers['X-Real-IP']
}
if ip.contains(',') {
ip = ip.all_before(',')
}
return ip
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// TODO make return ctx.conn.peer_ip() or { '' } work
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//res := ctx.conn.peer_ip() or { '' }
//return res
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}
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pub fn (mut ctx Context) error(s string) {
ctx.form_error = s
}
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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')
}
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pub fn not_found() Result {
return Result{}
}
fn filter(s string) string {
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return s.replace_each([
'<', '&lt;',
'"', '&quot;',
'&', '&amp;',
])
}
pub type RawHtml = string