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https://github.com/vlang/v.git
synced 2023-08-10 21:13:21 +03:00
623 lines
16 KiB
V
623 lines
16 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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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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// TODO: use http.response structs
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http_400 = 'HTTP/1.1 400 Bad Request\r\nContent-Type: text/plain\r\nContent-Length: 15\r\n${headers_close}400 Bad Request'
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http_404 = 'HTTP/1.1 404 Not Found\r\nContent-Type: text/plain\r\nContent-Length: 13\r\n${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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struct UnexpectedExtraAttributeError {
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msg string
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code int
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}
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struct MultiplePathAttributesError {
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msg string = 'Expected at most one path attribute'
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code int
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}
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// declaring init_server in your App struct is optional
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pub fn (ctx Context) init_server() {}
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// declaring before_request in your App struct is optional
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pub fn (ctx Context) before_request() {}
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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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[manualfree]
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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: $val'
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// println(ctx.headers)
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}
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// Returns the header data from the key
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pub fn (ctx &Context) get_header(key string) string {
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return ctx.req.header.get_custom(key) or { '' }
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}
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pub fn run<T>(port int) {
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mut app := T{}
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run_app<T>(mut app, port)
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}
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pub fn run_app<T>(mut app T, port int) {
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mut l := net.listen_tcp(port) or { panic('failed to listen') }
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println('[Vweb] Running app on http://localhost:$port')
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app.Context = Context{
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conn: 0
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}
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app.init_server()
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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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[manualfree]
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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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defer {
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reader.free()
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}
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page_gen_start := time.ticks()
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req := parse_request(mut reader) or {
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// Prevents errors from being thrown when BufferedReader is empty
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if '$err' != 'none' {
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eprintln('error parsing request: $err')
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}
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return
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}
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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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ct := req.header.get(.content_type) or { '' }.split(';').map(it.trim_left(' \t'))
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if 'multipart/form-data' in ct {
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boundary := ct.filter(it.starts_with('boundary='))
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if boundary.len != 1 {
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send_string(mut conn, vweb.http_400) or {}
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return
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}
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form, files := parse_multipart_form(req.data, boundary[0][9..])
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for k, v in form {
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app.form[k] = v
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}
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for k, v in files {
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app.files[k] = v
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}
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} else {
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form := parse_form(req.data)
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for k, v in form {
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app.form[k] = v
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}
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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: get the real path
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url := urllib.parse(app.req.url) or {
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eprintln('error parsing path: $err')
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return
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}
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if serve_static<T>(mut app, url) {
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// successfully served a static file
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return
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}
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app.before_request()
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// Call the right action
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$if debug {
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println('route matching...')
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}
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url_words := url.path.split('/').filter(it != '')
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// copy query args to app.query
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for k, v in url.query().data {
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app.query[k] = v.data[0]
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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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mut method_args := []string{}
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// TODO: move to server start
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http_methods, route_path := parse_attrs(method.name, method.attrs) or {
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eprintln('error parsing method attributes: $err')
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return
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}
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// Used for route matching
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route_words := route_path.split('/').filter(it != '')
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// Skip if the HTTP request method does not match the attributes
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if app.req.method in http_methods {
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// Route immediate matches first
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// For example URL `/register` matches route `/:user`, but `fn register()`
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// should be called first.
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if !route_path.contains('/:') && url_words == route_words {
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// We found a match
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app.$method()
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return
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}
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if url_words.len == 0 && route_words == ['index'] && method.name == 'index' {
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app.$method()
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return
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}
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if params := route_matches(url_words, route_words) {
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method_args = params.clone()
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if method_args.len != method.args.len {
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eprintln('warning: uneven parameters count ($method.args.len) in `$method.name`, compared to the vweb route `$method.attrs` ($method_args.len)')
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}
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app.$method(method_args)
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return
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}
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}
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}
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}
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// site not found
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send_string(mut conn, vweb.http_404) or {}
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}
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fn route_matches(url_words []string, route_words []string) ?[]string {
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// URL path should be at least as long as the route path
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if url_words.len < route_words.len {
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return none
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}
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mut params := []string{cap: url_words.len}
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if url_words.len == route_words.len {
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for i in 0 .. url_words.len {
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if route_words[i].starts_with(':') {
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// We found a path paramater
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params << url_words[i]
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} else if route_words[i] != url_words[i] {
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// This url does not match the route
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return none
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}
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}
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return params
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}
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// The last route can end with ... indicating an array
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if route_words.len == 0 || !route_words[route_words.len - 1].ends_with('...') {
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return none
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}
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for i in 0 .. route_words.len - 1 {
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if route_words[i].starts_with(':') {
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// We found a path paramater
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params << url_words[i]
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} else if route_words[i] != url_words[i] {
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// This url does not match the route
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return none
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}
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}
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params << url_words[route_words.len - 1..url_words.len].join('/')
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return params
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}
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// parse function attribute list for methods and a path
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fn parse_attrs(name string, attrs []string) ?([]http.Method, string) {
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if attrs.len == 0 {
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return [http.Method.get], '/$name'
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}
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mut x := attrs.clone()
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mut methods := []http.Method{}
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mut path := ''
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for i := 0; i < x.len; {
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attr := x[i]
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attru := attr.to_upper()
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m := http.method_from_str(attru)
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if attru == 'GET' || m != .get {
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methods << m
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x.delete(i)
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continue
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}
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if attr.starts_with('/') {
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if path != '' {
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return IError(&MultiplePathAttributesError{})
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}
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path = attr
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x.delete(i)
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continue
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}
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i++
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}
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if x.len > 0 {
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return IError(&UnexpectedExtraAttributeError{
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msg: 'Encountered unexpected extra attributes: $x'
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})
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}
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if methods.len == 0 {
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methods = [http.Method.get]
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}
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if path == '' {
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path = '/$name'
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}
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// Make path lowercase for case-insensitive comparisons
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return methods, path.to_lower()
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}
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// check if request is for a static file and serves it
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// returns true if we served a static file, false otherwise
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fn serve_static<T>(mut app T, url urllib.URL) bool {
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// TODO: handle url parameters properly - for now, ignore them
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static_file := app.static_files[url.path]
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mime_type := app.static_mime_types[url.path]
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if static_file == '' || mime_type == '' {
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return false
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}
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data := os.read_file(static_file) or {
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send_string(mut app.conn, vweb.http_404) or {}
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return true
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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 true
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}
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|
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fn (mut ctx Context) scan_static_directory(directory_path string, 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 {
|
|
full_path := os.join_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
|
|
}
|
|
|
|
// mount_static_folder_at - makes all static files in `directory_path` and inside it, available at http://server/mount_path
|
|
// For example: suppose you have called .mount_static_folder_at('/var/share/myassets', '/assets'),
|
|
// and you have a file /var/share/myassets/main.css .
|
|
// => That file will be available at URL: http://server/assets/main.css .
|
|
pub fn (mut ctx Context) mount_static_folder_at(directory_path string, mount_path string) bool {
|
|
if ctx.done || mount_path.len < 1 || mount_path[0] != `/` || !os.exists(directory_path) {
|
|
return false
|
|
}
|
|
dir_path := directory_path.trim_right('/')
|
|
ctx.scan_static_directory(dir_path, mount_path[1..])
|
|
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.header.get(.x_forwarded_for) or { '' }
|
|
if ip == '' {
|
|
ip = ctx.req.header.get_custom('X-Real-Ip') or { '' }
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
// 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()) ?
|
|
}
|