368 lines
8.3 KiB
V
368 lines
8.3 KiB
V
// Copyright (c) 2019-2020 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 http
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import net.urllib
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import net.http.chunked
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const (
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max_redirects = 4
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content_type_default = 'text/plain'
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)
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pub struct Request {
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pub:
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method string
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headers map[string]string
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cookies map[string]string
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data string
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url string
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user_agent string
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verbose bool
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mut:
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user_ptr voidptr
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ws_func voidptr
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}
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pub struct FetchConfig {
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pub mut:
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method string
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data string=''
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params map[string]string=map[string]string
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headers map[string]string=map[string]string
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cookies map[string]string=map[string]string
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user_agent string='v'
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verbose bool=false
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}
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pub struct Response {
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pub:
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text string
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headers map[string]string
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cookies map[string]string
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status_code int
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}
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pub fn get(url string) ?Response {
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return fetch_with_method('GET', url, FetchConfig{})
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}
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pub fn post(url, data string) ?Response {
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return fetch_with_method('POST', url, {
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data: data
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headers: {
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'Content-Type': content_type_default
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}
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})
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}
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pub fn post_form(url string, data map[string]string) ?Response {
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return fetch_with_method('POST', url, {
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headers: {
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'Content-Type': 'application/x-www-form-urlencoded'
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}
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data: url_encode_form_data(data)
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})
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}
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pub fn put(url, data string) ?Response {
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return fetch_with_method('PUT', url, {
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data: data
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headers: {
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'Content-Type': content_type_default
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}
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})
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}
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pub fn patch(url, data string) ?Response {
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return fetch_with_method('PATCH', url, {
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data: data
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headers: {
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'Content-Type': content_type_default
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}
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})
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}
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pub fn head(url string) ?Response {
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return fetch_with_method('HEAD', url, FetchConfig{})
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}
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pub fn delete(url string) ?Response {
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return fetch_with_method('DELETE', url, FetchConfig{})
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}
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pub fn fetch(_url string, config FetchConfig) ?Response {
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if _url == '' {
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return error('http.fetch: empty url')
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}
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url := build_url_from_fetch(_url, config) or {
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return error('http.fetch: invalid url ${_url}')
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}
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data := config.data
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method := config.method.to_upper()
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req := Request{
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method: method
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url: url
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data: data
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headers: config.headers
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cookies: config.cookies
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user_agent: config.user_agent
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ws_func: 0
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user_ptr: 0
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verbose: config.verbose
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}
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res := req.do() or {
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return error(err)
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}
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return res
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}
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pub fn get_text(url string) string {
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resp := fetch(url, {
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method: 'GET'
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}) or {
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return ''
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}
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return resp.text
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}
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pub fn url_encode_form_data(data map[string]string) string {
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mut pieces := []string
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for _key, _value in data {
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key := urllib.query_escape(_key)
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value := urllib.query_escape(_value)
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pieces << '$key=$value'
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}
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return pieces.join('&')
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}
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fn fetch_with_method(method string, url string, _config FetchConfig) ?Response {
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mut config := _config
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config.method = method
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return fetch(url, config)
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}
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fn build_url_from_fetch(_url string, config FetchConfig) ?string {
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mut url := urllib.parse(_url) or {
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return error(err)
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}
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params := config.params
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if params.keys().len == 0 {
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return url.str()
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}
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mut pieces := []string
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for key in params.keys() {
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pieces << '${key}=${params[key]}'
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}
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mut query := pieces.join('&')
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if url.raw_query.len > 1 {
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query = url.raw_query + '&' + query
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}
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url.raw_query = query
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return url.str()
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}
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fn (req mut Request) free() {
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req.headers.free()
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}
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fn (resp mut Response) free() {
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resp.headers.free()
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}
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// add_header adds the key and value of an HTTP request header
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pub fn (req mut Request) add_header(key, val string) {
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req.headers[key] = val
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}
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pub fn parse_headers(lines []string) map[string]string {
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mut headers := map[string]string
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for i, line in lines {
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if i == 0 {
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continue
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}
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words := line.split(': ')
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if words.len != 2 {
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continue
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}
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headers[words[0]] = words[1]
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}
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return headers
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}
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// do will send the HTTP request and returns `http.Response` as soon as the response is recevied
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pub fn (req &Request) do() ?Response {
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mut url := urllib.parse(req.url) or {
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return error('http.Request.do: invalid url ${req.url}')
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}
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mut rurl := url
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mut resp := Response{}
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mut no_redirects := 0
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for {
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if no_redirects == max_redirects {
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return error('http.request.do: maximum number of redirects reached ($max_redirects)')
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}
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qresp := req.method_and_url_to_response(req.method, rurl) or {
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return error(err)
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}
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resp = qresp
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if !(resp.status_code in [301, 302, 303, 307, 308]) {
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break
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}
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// follow any redirects
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mut redirect_url := resp.headers['Location']
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if redirect_url.len > 0 && redirect_url[0] == `/` {
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url.set_path(redirect_url) or {
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return error('http.request.do: invalid path in redirect: "$redirect_url"')
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}
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redirect_url = url.str()
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}
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qrurl := urllib.parse(redirect_url) or {
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return error('http.request.do: invalid URL in redirect "$redirect_url"')
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}
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rurl = qrurl
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no_redirects++
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}
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return resp
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}
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fn (req &Request) method_and_url_to_response(method string, url net_dot_urllib.URL) ?Response {
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host_name := url.hostname()
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scheme := url.scheme
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p := url.path.trim_left('/')
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path := if url.query().size > 0 { '/$p?${url.query().encode()}' } else { '/$p' }
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mut nport := url.port().int()
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if nport == 0 {
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if scheme == 'http' {
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nport = 80
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}
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if scheme == 'https' {
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nport = 443
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}
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}
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// println('fetch $method, $scheme, $host_name, $nport, $path ')
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if scheme == 'https' {
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// println('ssl_do( $nport, $method, $host_name, $path )')
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res := req.ssl_do(nport, method, host_name, path) or {
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return error(err)
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}
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return res
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}
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else if scheme == 'http' {
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// println('http_do( $nport, $method, $host_name, $path )')
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res := req.http_do(nport, method, host_name, path) or {
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return error(err)
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}
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return res
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}
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return error('http.request.method_and_url_to_response: unsupported scheme: "$scheme"')
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}
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fn parse_response(resp string) Response {
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// TODO: Header data type
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mut headers := map[string]string
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// TODO: Cookie data type
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mut cookies := map[string]string
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first_header := resp.all_before('\n')
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mut status_code := 0
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if first_header.contains('HTTP/') {
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val := first_header.find_between(' ', ' ')
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status_code = val.int()
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}
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mut text := ''
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// Build resp headers map and separate the body
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mut nl_pos := 3
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mut i := 1
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for {
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old_pos := nl_pos
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nl_pos = resp.index_after('\n', nl_pos + 1)
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if nl_pos == -1 {
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break
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}
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h := resp[old_pos + 1..nl_pos]
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// End of headers
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if h.len <= 1 {
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text = resp[nl_pos + 1..]
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break
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}
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i++
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pos := h.index(':') or {
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continue
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}
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// if h.contains('Content-Type') {
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// continue
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// }
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key := h[..pos]
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val := h[pos + 2..]
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if key == 'Set-Cookie' {
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parts := val.trim_space().split('=')
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cookies[parts[0]] = parts[1]
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}
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headers[key] = val.trim_space()
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}
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if headers['Transfer-Encoding'] == 'chunked' {
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text = chunked.decode(text)
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}
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return Response{
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status_code: status_code
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headers: headers
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cookies: cookies
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text: text
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}
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}
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fn (req &Request) build_request_headers(method, host_name, path string) string {
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ua := req.user_agent
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mut uheaders := []string
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if !('Host' in req.headers) {
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uheaders << 'Host: $host_name\r\n'
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}
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if !('User-Agent' in req.headers) {
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uheaders << 'User-Agent: $ua\r\n'
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}
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if req.data.len > 0 && !('Content-Length' in req.headers) {
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uheaders << 'Content-Length: ${req.data.len}\r\n'
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}
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for key, val in req.headers {
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if key == 'Cookie' {
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continue
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}
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uheaders << '${key}: ${val}\r\n'
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}
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uheaders << req.build_request_cookies_header()
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return '$method $path HTTP/1.1\r\n' + uheaders.join('') + 'Connection: close\r\n\r\n' + req.data
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}
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fn (req &Request) build_request_cookies_header() string {
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if req.cookies.keys().len < 1 {
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return ''
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}
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mut cookie := []string
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for key, val in req.cookies {
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cookie << '$key: $val'
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}
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if 'Cookie' in req.headers && req.headers['Cookie'] != '' {
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cookie << req.headers['Cookie']
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}
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return 'Cookie: ' + cookie.join('; ') + '\r\n'
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}
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pub fn unescape_url(s string) string {
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panic('http.unescape_url() was replaced with urllib.query_unescape()')
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}
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pub fn escape_url(s string) string {
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panic('http.escape_url() was replaced with urllib.query_escape()')
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}
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pub fn unescape(s string) string {
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panic('http.unescape() was replaced with http.unescape_url()')
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}
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pub fn escape(s string) string {
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panic('http.escape() was replaced with http.escape_url()')
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}
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type wsfn fn(s string, ptr voidptr)
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