686 lines
18 KiB
V
686 lines
18 KiB
V
// Copyright (c) 2019-2021 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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module vweb
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import os
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import io
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import net
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import net.http
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import net.urllib
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import strings
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import time
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pub const (
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methods_with_form = [http.Method.post, .put, .patch]
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methods_without_first = ['ost', 'ut', 'et', 'atch', 'ptions', 'elete', 'ead'] // needed for method checking as method parameter
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header_server = 'Server: VWeb\r\n'
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header_connection_close = 'Connection: close\r\n'
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headers_close = '$header_server$header_connection_close\r\n'
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http_404 = 'HTTP/1.1 404 Not Found\r\nContent-Type: text/plain\r\nContent-Length: 13\r\n${headers_close}404 Not Found'
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http_500 = 'HTTP/1.1 500 Internal Server Error\r\nContent-Type: text/plain\r\n${headers_close}500 Internal Server Error'
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mime_types = map{
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'.css': 'text/css; charset=utf-8'
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'.gif': 'image/gif'
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'.htm': 'text/html; charset=utf-8'
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'.html': 'text/html; charset=utf-8'
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'.jpg': 'image/jpeg'
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'.js': 'application/javascript'
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'.json': 'application/json'
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'.md': 'text/markdown; charset=utf-8'
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'.pdf': 'application/pdf'
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'.png': 'image/png'
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'.svg': 'image/svg+xml'
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'.txt': 'text/plain; charset=utf-8'
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'.wasm': 'application/wasm'
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'.xml': 'text/xml; charset=utf-8'
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}
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max_http_post_size = 1024 * 1024
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default_port = 8080
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)
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pub struct Context {
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mut:
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content_type string = 'text/plain'
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status string = '200 OK'
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pub:
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req http.Request
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// TODO Response
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pub mut:
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conn &net.TcpConn
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static_files map[string]string
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static_mime_types map[string]string
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form map[string]string
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query map[string]string
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files map[string][]FileData
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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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chunked_transfer bool
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max_chunk_len int = 20
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}
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struct FileData {
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pub:
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filename string
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content_type string
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data string
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}
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// declaring init_once in your App struct is optional
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pub fn (ctx Context) init_once() {}
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// declaring init in your App struct is optional
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pub fn (ctx Context) init() {}
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pub struct Cookie {
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name string
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value string
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expires time.Time
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secure bool
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http_only bool
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}
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[noinit]
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pub struct Result {
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}
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// vweb intern function
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pub fn (mut ctx Context) send_response_to_client(mimetype string, res string) bool {
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if ctx.done {
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return false
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}
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ctx.done = true
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mut sb := strings.new_builder(1024)
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defer {
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unsafe { sb.free() }
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}
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sb.write_string('HTTP/1.1 $ctx.status')
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sb.write_string('\r\nContent-Type: $mimetype')
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sb.write_string('\r\nContent-Length: $res.len')
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if ctx.chunked_transfer {
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sb.write_string('\r\nTransfer-Encoding: chunked')
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}
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sb.write_string(ctx.headers)
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sb.write_string('\r\n')
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sb.write_string(vweb.headers_close)
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if ctx.chunked_transfer {
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mut i := 0
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mut len := res.len
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for {
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if len <= 0 {
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break
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}
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mut chunk := ''
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if len > ctx.max_chunk_len {
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chunk = res[i..i + ctx.max_chunk_len]
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i += ctx.max_chunk_len
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len -= ctx.max_chunk_len
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} else {
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chunk = res[i..]
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len = 0
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}
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sb.write_string(chunk.len.hex())
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sb.write_string('\r\n$chunk\r\n')
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}
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sb.write_string('0\r\n\r\n') // End of chunks
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} else {
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sb.write_string(res)
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}
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s := sb.str()
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defer {
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unsafe { s.free() }
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}
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send_string(mut ctx.conn, s) or { return false }
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return true
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}
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// Response HTTP_OK with s as payload with content-type `text/html`
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pub fn (mut ctx Context) html(s string) Result {
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ctx.send_response_to_client('text/html', s)
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return Result{}
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}
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// Response HTTP_OK with s as payload with content-type `text/plain`
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pub fn (mut ctx Context) text(s string) Result {
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ctx.send_response_to_client('text/plain', s)
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return Result{}
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}
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// Response HTTP_OK with s as payload with content-type `application/json`
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pub fn (mut ctx Context) json(s string) Result {
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ctx.send_response_to_client('application/json', s)
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return Result{}
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}
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// Response HTTP_OK with s as payload
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pub fn (mut ctx Context) ok(s string) Result {
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ctx.send_response_to_client(ctx.content_type, s)
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return Result{}
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}
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// Response a server error
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pub fn (mut ctx Context) server_error(ecode int) Result {
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$if debug {
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eprintln('> ctx.server_error ecode: $ecode')
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}
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if ctx.done {
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return Result{}
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}
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send_string(mut ctx.conn, vweb.http_500) or { }
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return Result{}
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}
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// Redirect to an url
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pub fn (mut ctx Context) redirect(url string) Result {
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if ctx.done {
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return Result{}
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}
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ctx.done = true
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send_string(mut ctx.conn, 'HTTP/1.1 302 Found\r\nLocation: $url$ctx.headers\r\n$vweb.headers_close') or {
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return Result{}
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}
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return Result{}
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}
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// Send an not_found response
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pub fn (mut ctx Context) not_found() Result {
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if ctx.done {
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return Result{}
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}
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ctx.done = true
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send_string(mut ctx.conn, vweb.http_404) or { }
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return Result{}
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}
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// Enables chunk transfer with max_chunk_len per chunk
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pub fn (mut ctx Context) enable_chunked_transfer(max_chunk_len int) {
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ctx.chunked_transfer = true
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ctx.max_chunk_len = max_chunk_len
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}
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// Sets a cookie
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pub fn (mut ctx Context) set_cookie(cookie Cookie) {
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mut cookie_data := []string{}
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mut secure := if cookie.secure { 'Secure;' } else { '' }
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secure += if cookie.http_only { ' HttpOnly' } else { ' ' }
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cookie_data << secure
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if cookie.expires.unix > 0 {
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cookie_data << 'expires=$cookie.expires.utc_string()'
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}
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data := cookie_data.join(' ')
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ctx.add_header('Set-Cookie', '$cookie.name=$cookie.value; $data')
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}
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// Old function
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[deprecated]
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pub fn (mut ctx Context) set_cookie_old(key string, val string) {
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// TODO support directives, escape cookie value (https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie)
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// ctx.add_header('Set-Cookie', '${key}=${val}; Secure; HttpOnly')
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ctx.add_header('Set-Cookie', '$key=$val; HttpOnly')
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}
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// Sets the response content type
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pub fn (mut ctx Context) set_content_type(typ string) {
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ctx.content_type = typ
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}
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// Sets a cookie with a `expire_data`
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pub fn (mut ctx Context) set_cookie_with_expire_date(key string, val string, expire_date time.Time) {
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ctx.add_header('Set-Cookie', '$key=$val; Secure; HttpOnly; expires=$expire_date.utc_string()')
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}
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// Gets a cookie by a key
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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')
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if cookie_header == '' {
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cookie_header = ctx.get_header('Cookie')
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}
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cookie_header = ' ' + cookie_header
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// println('cookie_header="$cookie_header"')
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// 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(' $key=', '\r')
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}
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if cookie != '' {
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return cookie.trim_space()
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}
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return error('Cookie not found')
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}
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// Sets the response status
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pub fn (mut ctx Context) set_status(code int, desc string) {
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if code < 100 || code > 599 {
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ctx.status = '500 Internal Server Error'
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} else {
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ctx.status = '$code $desc'
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}
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}
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// Adds an header to the response with key and val
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pub fn (mut ctx Context) add_header(key string, val string) {
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// println('add_header($key, $val)')
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ctx.headers = ctx.headers + '\r\n$key: $val'
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// println(ctx.headers)
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}
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// Returns the header data from the key
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pub fn (ctx &Context) get_header(key string) string {
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return ctx.req.lheaders[key.to_lower()]
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}
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pub fn run<T>(port int) {
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mut app := T{}
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run_app<T>(mut app, port)
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}
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pub fn run_app<T>(mut app T, port int) {
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mut l := net.listen_tcp(port) or { panic('failed to listen') }
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println('[Vweb] Running app on http://localhost:$port')
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app.Context = Context{
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conn: 0
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}
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app.init_once()
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$for method in T.methods {
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$if method.return_type is Result {
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// check routes for validity
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}
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}
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for {
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mut conn := l.accept() or { panic('accept() failed') }
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// TODO: running handle_conn concurrently results in a race-condition
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handle_conn<T>(mut conn, mut app)
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}
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}
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fn handle_conn<T>(mut conn net.TcpConn, mut app T) {
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conn.set_read_timeout(30 * time.second)
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conn.set_write_timeout(30 * time.second)
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defer {
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conn.close() or { }
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}
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mut reader := io.new_buffered_reader(reader: io.make_reader(conn))
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page_gen_start := time.ticks()
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req := parse_request(mut reader) or { return }
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app.Context = Context{
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req: req
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conn: conn
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form: map[string]string{}
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static_files: app.static_files
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static_mime_types: app.static_mime_types
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page_gen_start: page_gen_start
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}
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if req.method in vweb.methods_with_form {
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if 'multipart/form-data' in req.lheaders['content-type'].split('; ') {
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boundary := req.lheaders['content-type'].split('; ').filter(it.starts_with('boundary '))
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if boundary.len != 1 {
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// TODO: send 400 error
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return
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}
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app.parse_multipart_form(req.data, boundary[0][9..])
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} else {
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app.parse_form(req.data)
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}
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}
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// Serve a static file if it is one
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// TODO: handle url parameters properly - for now, ignore them
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mut static_file_name := app.req.url
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// TODO: use urllib methods instead of manually parsing
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if static_file_name.contains('?') {
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static_file_name = static_file_name.all_before('?')
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}
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static_file := app.static_files[static_file_name]
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mime_type := app.static_mime_types[static_file_name]
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if static_file != '' && mime_type != '' {
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data := os.read_file(static_file) or {
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send_string(mut conn, vweb.http_404) or { }
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return
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}
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app.send_response_to_client(mime_type, data)
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unsafe { data.free() }
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return
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}
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app.init()
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// Call the right action
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$if debug {
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println('route matching...')
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}
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mut route_words_a := [][]string{}
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// TODO: use urllib methods instead of manually parsing
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mut url_words := req.url.split('/').filter(it != '')
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// Parse URL query
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if url_words.len > 0 && url_words.last().contains('?') {
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words := url_words.last().after('?').split('&')
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tmp_query := words.map(it.split('='))
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url_words[url_words.len - 1] = url_words.last().all_before('?')
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for data in tmp_query {
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if data.len == 2 {
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app.query[data[0]] = data[1]
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}
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}
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}
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mut vars := []string{cap: route_words_a.len}
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mut action := ''
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$for method in T.methods {
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$if method.return_type is Result {
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attrs := method.attrs
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route_words_a = [][]string{}
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// Get methods
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// Get is default
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mut req_method_str := '$req.method'
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if req.method == .post {
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if 'post' in attrs {
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route_words_a = attrs.filter(it.to_lower() != 'post').map(it[1..].split('/'))
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}
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} else if req.method == .put {
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if 'put' in attrs {
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route_words_a = attrs.filter(it.to_lower() != 'put').map(it[1..].split('/'))
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}
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} else if req.method == .patch {
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if 'patch' in attrs {
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route_words_a = attrs.filter(it.to_lower() != 'patch').map(it[1..].split('/'))
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}
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} else if req.method == .delete {
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if 'delete' in attrs {
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route_words_a = attrs.filter(it.to_lower() != 'delete').map(it[1..].split('/'))
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}
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} else if req.method == .head {
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if 'head' in attrs {
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route_words_a = attrs.filter(it.to_lower() != 'head').map(it[1..].split('/'))
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}
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} else if req.method == .options {
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if 'options' in attrs {
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route_words_a = attrs.filter(it.to_lower() != 'options').map(it[1..].split('/'))
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}
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} else {
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route_words_a = attrs.filter(it.to_lower() != 'get').map(it[1..].split('/'))
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}
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if attrs.len == 0 || (attrs.len == 1 && route_words_a.len == 0) {
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if url_words.len > 0 {
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// No routing for this method. If it matches, call it and finish matching
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// since such methods have a priority.
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// For example URL `/register` matches route `/:user`, but `fn register()`
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// should be called first.
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if (req_method_str == '' && url_words[0] == method.name && url_words.len == 1)
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|| (req_method_str == req.method.str() && url_words[0] == method.name
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&& url_words.len == 1) {
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$if debug {
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println('easy match method=$method.name')
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}
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app.$method(vars)
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return
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}
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} else if method.name == 'index' {
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// handle / to .index()
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$if debug {
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println('route to .index()')
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}
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app.$method(vars)
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return
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}
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} else {
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mut req_method := []string{}
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if route_words_a.len > 0 {
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for route_words_ in route_words_a {
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// cannot move to line initialize line because of C error with map(it.filter(it != ''))
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route_words := route_words_.filter(it != '')
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if route_words.len == 1 && route_words[0] in vweb.methods_without_first {
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req_method << route_words[0]
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}
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if url_words.len == route_words.len || (url_words.len >= route_words.len - 1
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&& route_words.len > 0 && route_words.last().ends_with('...')) {
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if req_method.len > 0 {
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if req_method_str.to_lower()[1..] !in req_method {
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continue
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}
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}
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// match `/:user/:repo/tree` to `/vlang/v/tree`
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mut matching := false
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mut unknown := false
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mut variables := []string{cap: route_words.len}
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if route_words.len == 0 && url_words.len == 0 {
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// index route
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matching = true
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}
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for i in 0 .. route_words.len {
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if url_words.len == i {
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variables << ''
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matching = true
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unknown = true
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break
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}
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if url_words[i] == route_words[i] {
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// no parameter
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matching = true
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continue
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} else if route_words[i].starts_with(':') {
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// is parameter
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if i < route_words.len && !route_words[i].ends_with('...') {
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// normal parameter
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variables << url_words[i]
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} else {
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// array parameter only in the end
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variables << url_words[i..].join('/')
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}
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matching = true
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unknown = true
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continue
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} else {
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matching = false
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break
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}
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}
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if matching && !unknown {
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// absolute router words like `/test/site`
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app.$method(vars)
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return
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} else if matching && unknown {
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// router words with paramter like `/:test/site`
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action = method.name
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vars = variables.clone()
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}
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req_method = []string{}
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}
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}
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}
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}
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}
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}
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if action == '' {
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// site not found
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send_string(mut conn, vweb.http_404) or { }
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return
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}
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$for method in T.methods {
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$if method.return_type is Result {
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// search again for method
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if action == method.name && method.attrs.len > 0 {
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// call action method
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if method.args.len == vars.len {
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app.$method(vars)
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return
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} else {
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eprintln('warning: uneven parameters count ($method.args.len) in `$method.name`, compared to the vweb route `$method.attrs` ($vars.len)')
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}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// vweb intern function
|
|
pub fn (mut ctx Context) parse_form(s string) {
|
|
if ctx.req.method !in vweb.methods_with_form {
|
|
return
|
|
}
|
|
// 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 := urllib.query_unescape(keyval[0]) or { continue }
|
|
val := urllib.query_unescape(keyval[1]) or { continue }
|
|
$if debug {
|
|
println('http form "$key" => "$val"')
|
|
}
|
|
ctx.form[key] = val
|
|
}
|
|
// }
|
|
// todo: parse form-data and application/json
|
|
// ...
|
|
}
|
|
|
|
// vweb intern function
|
|
[manualfree]
|
|
pub fn (mut ctx Context) parse_multipart_form(s string, b string) {
|
|
if ctx.req.method !in vweb.methods_with_form {
|
|
return
|
|
}
|
|
a := s.split('$b')[1..]
|
|
fields := a[..a.len - 1]
|
|
for field in fields {
|
|
lines := field.split_into_lines()[1..]
|
|
mut l := 0
|
|
// Parse name
|
|
disposition_data := lines[l].split('; ')[1..]
|
|
l++
|
|
name := disposition_data[0][6..disposition_data[0].len - 1]
|
|
// Parse files
|
|
if disposition_data.len > 1 {
|
|
filename := disposition_data[1][10..disposition_data[1].len - 1]
|
|
ct := lines[l].split(': ')[1]
|
|
l++
|
|
if name !in ctx.files {
|
|
ctx.files[name] = []FileData{}
|
|
}
|
|
mut sb := strings.new_builder(field.len)
|
|
for i in l + 1 .. lines.len - 1 {
|
|
sb.writeln(lines[i])
|
|
}
|
|
ctx.files[name] << FileData{
|
|
filename: filename
|
|
content_type: ct
|
|
data: sb.str()
|
|
}
|
|
unsafe {
|
|
sb.free()
|
|
}
|
|
continue
|
|
}
|
|
mut sb := strings.new_builder(field.len)
|
|
for i in l + 1 .. lines.len - 1 {
|
|
sb.writeln(lines[i])
|
|
}
|
|
ctx.form[name] = sb.str()
|
|
unsafe {
|
|
disposition_data.free()
|
|
name.free()
|
|
sb.free()
|
|
}
|
|
}
|
|
}
|
|
|
|
fn (mut ctx Context) scan_static_directory(directory_path string, mount_path string) {
|
|
files := os.ls(directory_path) or { panic(err) }
|
|
if files.len > 0 {
|
|
for file in files {
|
|
full_path := directory_path + '/' + file
|
|
if os.is_dir(full_path) {
|
|
ctx.scan_static_directory(full_path, mount_path + '/' + file)
|
|
} else if file.contains('.') && !file.starts_with('.') && !file.ends_with('.') {
|
|
ext := os.file_ext(file)
|
|
// Rudimentary guard against adding files not in mime_types.
|
|
// Use serve_static directly to add non-standard mime types.
|
|
if ext in vweb.mime_types {
|
|
ctx.serve_static(mount_path + '/' + file, full_path, vweb.mime_types[ext])
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// Handles a directory static
|
|
// If `root` is set the mount path for the dir will be in '/'
|
|
pub fn (mut ctx Context) handle_static(directory_path string, root bool) bool {
|
|
if ctx.done || !os.exists(directory_path) {
|
|
return false
|
|
}
|
|
dir_path := directory_path.trim_space().trim_right('/')
|
|
mut mount_path := ''
|
|
if dir_path != '.' && os.is_dir(dir_path) && !root {
|
|
// Mount point hygene, "./assets" => "/assets".
|
|
mount_path = '/' + dir_path.trim_left('.').trim('/')
|
|
}
|
|
ctx.scan_static_directory(dir_path, mount_path)
|
|
return true
|
|
}
|
|
|
|
// Serves a file static
|
|
// `url` is the access path on the site, `file_path` is the real path to the file, `mime_type` is the file type
|
|
pub fn (mut ctx Context) serve_static(url string, file_path string, mime_type string) {
|
|
ctx.static_files[url] = file_path
|
|
ctx.static_mime_types[url] = mime_type
|
|
}
|
|
|
|
// Returns the ip address from the current user
|
|
pub fn (ctx &Context) ip() string {
|
|
mut ip := ctx.req.lheaders['x-forwarded-for']
|
|
if ip == '' {
|
|
ip = ctx.req.lheaders['x-real-ip']
|
|
}
|
|
|
|
if ip.contains(',') {
|
|
ip = ip.all_before(',')
|
|
}
|
|
if ip == '' {
|
|
ip = ctx.conn.peer_ip() or { '' }
|
|
}
|
|
return ip
|
|
}
|
|
|
|
// Set s to the form error
|
|
pub fn (mut ctx Context) error(s string) {
|
|
ctx.form_error = s
|
|
}
|
|
|
|
fn strip(s string) string {
|
|
// strip('\nabc\r\n') => 'abc'
|
|
return s.trim('\r\n')
|
|
}
|
|
|
|
// Returns an empty result
|
|
pub fn not_found() Result {
|
|
return Result{}
|
|
}
|
|
|
|
fn filter(s string) string {
|
|
return s.replace_each([
|
|
'<',
|
|
'<',
|
|
'"',
|
|
'"',
|
|
'&',
|
|
'&',
|
|
])
|
|
}
|
|
|
|
// A type which don't get filtered inside templates
|
|
pub type RawHtml = string
|
|
|
|
fn send_string(mut conn net.TcpConn, s string) ? {
|
|
conn.write(s.bytes()) ?
|
|
}
|