標籤：control ike strip user prot 服務端 ict meta data
# websocket實現原理‘‘‘1.服務端開啟socket，監聽ip和連接埠2.用戶端發送串連請求（帶上ip和連接埠）3.服務端允許串連4.用戶端產生一個隨機字串，和magic string組合進行一個sha1加密，加密。並將隨機字串發送給服務端5.然後服務端也要用相同的方式進行加密。6.然後服務端將加密之後的密串返回給用戶端7.用戶端將服務端返回的密串和自己加密之後的密串進行比對，如果一樣，說明遵循同樣的協議。如果不一樣，就沒法玩了·····‘‘‘import socketimport base64import hashlibfrom pprint import pprintdef get_headers(data): """ 將要求標頭格式化成字典 :param data: :return: """ header_dict = {} data = str(data, encoding=‘utf-8‘) header, body = data.split(‘\r\n\r\n‘, 1) header_list = header.split(‘\r\n‘) for i in range(0, len(header_list)): if i == 0: if len(header_list[i].split(‘ ‘)) == 3: header_dict[‘method‘], header_dict[‘url‘], header_dict[‘protocol‘] = header_list[i].split(‘ ‘) else: k, v = header_list[i].split(‘:‘, 1) header_dict[k] = v.strip() return header_dictserver = socket.socket(socket.AF_INET, socket.SOCK_STREAM)server.bind((‘localhost‘, 8080))server.listen(5)# 等待使用者串連conn, addr = server.accept()# 握手訊息content = conn.recv(8096)‘‘‘>>> print(content)b‘GET / HTTP/1.1\r\nHost: localhost:8080\r\nConnection: Upgrade\r\nPragma: no-cache\r\nCache-Control: no-cache\r\nUpgrade: websocket\r\nOrigin: http://localhost:63342\r\nSec-WebSocket-Version: 13\r\nUser-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36\r\nAccept-Encoding: gzip, deflate, br\r\nAccept-Language: zh-CN,zh;q=0.9\r\nCookie: uuid=81a68694c772e0c62d4a5a3c256fe3e0; sensorsdata2015jssdkcross=%7B%22distinct_id%22%3A%2216453a8bf2bbe-09a40e8e58a866-5e442e19-1fa400-16453a8bf2c745%22%7D; Hm_lvt_2af69bc2b378fb58ae04ed2a04257ed1=1530411925; Pycharm-bdfc5fce=a920e49d-da4e-4d2f-a76e-17acfacc6462\r\nSec-WebSocket-Key: 1y6WpsSgfF80wqi3HpmrqQ==\r\nSec-WebSocket-Extensions: permessage-deflate; client_max_window_bits\r\n\r\n‘‘‘‘# 擷取要求標頭headers = get_headers(content)‘‘‘>>>pprint(headers){‘Cache-Control‘: ‘no-cache‘, ‘Connection‘: ‘Upgrade‘, ‘Cookie‘: ‘Pycharm-bdfc5fce=a920e49d-da4e-4d2f-a76e-17acfacc6462‘, ‘Host‘: ‘localhost:8080‘, ‘Origin‘: ‘http://localhost:63342‘, ‘Sec-WebSocket-Key‘: ‘RRGDeYeYSGEP9eHy85u8oQ==‘, ‘Sec-WebSocket-Version‘: ‘13‘, ‘Upgrade‘: ‘websocket‘, ‘User-Agent‘: ‘Mozilla/5.0 (Windows NT 10.0; WOW64; Trident/7.0; rv:11.0) ‘ ‘like Gecko‘, ‘method‘: ‘GET‘, ‘protocol‘: ‘HTTP/1.1‘, ‘url‘: ‘/‘}‘‘‘# 規定：魔法字串就叫這個magic_string = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"# 擷取隨機密串，並將其與魔法字串組合value = headers["Sec-WebSocket-Key"] + magic_string# 進行加密,規定，只能按照此加密方式hash_str = base64.b64encode(hashlib.sha1(bytes(value, encoding=‘utf-8‘)).digest())response_tpl = "HTTP/1.1 101 Switching Protocols\r\n" "Upgrade:websocket\r\n" "Connection: Upgrade\r\n" "Sec-WebSocket-Accept: %s\r\n" "WebSocket-Location: ws://%s%s\r\n\r\n"# 擷取握手訊息，組合魔法字串，進行sha1加密# 發送給用戶端response_str = response_tpl % (str(hash_str, encoding=‘utf-8‘), headers[‘Host‘], headers[‘url‘])conn.send(bytes(response_str, encoding=‘utf-8‘))
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>Title</title></head><body> <script> ws = new WebSocket("ws://localhost:8080/"); //如果串連成功，會列印下面這句話，否則不會列印 ws.onopen = function () { console.log(‘串連成功‘) } </script></body></html>
python實現websocket
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