copy ch8->ch9

679877a2 · James R. Wilcox · e7c0b437 · 679877a2 · 679877a2 · 679877a2
Commit 679877a2 authored 2 years ago by James R. Wilcox
--- a/ch9/browser.css
+++ b/ch9/browser.css
+pre { background-color: gray; }
+a { color: blue; }
+i { font-style: italic; }
+b { font-weight: bold; }
+small { font-size: 90%; }
+big { font-size: 110%; }
+
+input {
+    font-size: 16px; font-weight: normal; font-style: normal;
+    background-color: lightblue;
+}
+button {
+    font-size: 16px; font-weight: normal; font-style: normal;
+    background-color: orange;
+}
--- a/ch9/browser.py
+++ b/ch9/browser.py
--- a/ch9/server.py
+++ b/ch9/server.py
+import socket
+import urllib.parse
+
+
+ENTRIES = ["James was here"]
+
+
+def show_comments():
+    out = "<!doctype html><html><body>"
+    for entry in ENTRIES:
+        out += f"<p>{entry}</p>"
+
+    out += "<form action=add method=post>"
+    out += "<p><input name=guest></p>"
+    out += "<p><button>Sign the book!</button></p>"
+    out += "</form>"
+
+    out += "</body></html>"
+
+    return out
+
+
+def do_request(method, url, headers, body):
+    if method == "GET" and url == "/":
+        return "200 OK", show_comments()
+    elif method == "POST" and url == "/add":
+        params = form_decode(body)
+        return "200 OK", add_entry(params)
+    else:
+        return "404 Not Found", not_found(url, method)
+
+
+def form_decode(body):
+    params = {}
+    for field in body.split("&"):
+        name, value = field.split("=", 1)
+        name = urllib.parse.unquote_plus(name)
+        value = urllib.parse.unquote_plus(value)
+        params[name] = value
+    return params
+
+
+def add_entry(params):
+    if 'guest' in params:
+        ENTRIES.append(params['guest'])
+    return show_comments()
+
+
+def not_found(url, method):
+    out = "<!doctype html>"
+    out += "<h1>{} {} not found!</h1>".format(method, url)
+    return out
+
+
+def handle_connection(conx):
+    req = conx.makefile("b")
+    reqline = req.readline().decode("utf8")
+    method, url, version = reqline.split(" ", 2)
+
+    assert method in ["GET", "POST"]
+
+    headers = {}
+    for line in req:
+        line = line.decode('utf8')
+        if line == '\r\n':
+            break
+        header, value = line.split(":", 1)
+        headers[header.lower()] = value.strip()
+
+    print(method, url, version, headers)
+
+    if 'content-length' in headers:
+        length = int(headers['content-length'])
+        body = req.read(length).decode('utf8')
+    else:
+        body = None
+
+    status, body = do_request(method, url, headers, body)
+    response = "HTTP/1.0 {}\r\n".format(status)
+    response += "Content-Length: {}\r\n".format(
+        len(body.encode("utf8")))
+    response += "\r\n" + body
+    conx.send(response.encode('utf8'))
+    conx.close()
+
+
+if __name__ == "__main__":
+    s = socket.socket(
+        family=socket.AF_INET,
+        type=socket.SOCK_STREAM,
+        proto=socket.IPPROTO_TCP,
+    )
+    s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+
+    s.bind(('', 8000))
+    s.listen()
+
+    while True:
+        conx, addr = s.accept()
+        handle_connection(conx)
--- a/ch9/test.html
+++ b/ch9/test.html
+<html>
+  <body>
+    <form action="/submit" method="post">
+      <p>Name: <input name=name value=1></p>
+      <p>Comment: <input name=comment value=2></p>
+      <p><button>Submit!</button></p>
+    </form>
+  </body>
+</html>