commit 9e455cf38f2450f37387068feb8f9f1e83d76711
Author: Jake Bauer <jbauer@paritybit.ca>
Date: Mon, 13 Feb 2023 16:12:03 -0500
Implement chapter 1 + HTTP/1.1
Diffstat:
| A | LICENSE | | | 38 | ++++++++++++++++++++++++++++++++++++++ |
| A | README.md | | | 3 | +++ |
| A | browser.py | | | 72 | ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
3 files changed, 113 insertions(+), 0 deletions(-)
diff --git a/LICENSE b/LICENSE
@@ -0,0 +1,38 @@
+Code copied from the book:
+
+Copyright 2018-2023 Pavel Panchekha & Chris Harrelson.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Code added by me to implement exercises:
+
+ISC License
+
+Copyright 2023 Jake Bauer <jbauer@paritybit.ca>
+
+Permission to use, copy, modify, and/or distribute this software for any purpose
+with or without fee is hereby granted, provided that the above copyright notice
+and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
+OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
+TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
+THIS SOFTWARE.
diff --git a/README.md b/README.md
@@ -0,0 +1,3 @@
+# browser.py
+
+Working through the exercises at [browser.engineering](//browser.engineering).
diff --git a/browser.py b/browser.py
@@ -0,0 +1,72 @@
+import socket
+import ssl
+
+def request(url):
+ scheme,url = url.split("://", 1)
+ assert scheme in ["http", "https"], \
+ "Unknown scheme {}".format(scheme)
+ host, path = url.split("/", 1)
+ path = "/" + path
+
+ s = socket.socket(
+ family=socket.AF_INET,
+ type=socket.SOCK_STREAM,
+ proto=socket.IPPROTO_TCP,
+ )
+
+ port = 80 if scheme == "http" else 443
+
+ if scheme == "https":
+ ctx = ssl.create_default_context()
+ s = ctx.wrap_socket(s, server_hostname=host)
+
+ if ":" in host:
+ host, port = host.split(":", 1)
+ port = int(port)
+
+ s.connect((host, port))
+
+ s.send("GET {} HTTP/1.1\r\n".format(path).encode("utf8") +
+ "Host: {}\r\n".format(host).encode("utf8") +
+ "Connection: close\r\n\r\n".encode("utf8"))
+
+ response = s.makefile("r", encoding="utf8", newline="\r\n")
+ statusline = response.readline()
+ version, status, explanation = statusline.split(" ", 2)
+ assert status == "200", "{}: {}".format(status, explanation)
+
+ headers = {}
+ while True:
+ line = response.readline()
+ if line == "\r\n": break
+ header, value = line.split(":", 1)
+ headers[header.lower()] = value.strip()
+
+ assert "transfer-encoding" not in headers
+ assert "content-encoding" not in headers
+
+ body = response.read()
+ s.close()
+
+ return headers, body
+
+
+def show(body):
+ in_angle = False
+ for c in body:
+ if c == "<":
+ in_angle = True
+ elif c == ">":
+ in_angle = False
+ elif not in_angle:
+ print(c, end="")
+
+
+def load(url):
+ headers, body = request(url)
+ show(body)
+
+
+if __name__ == "__main__":
+ import sys
+ load(sys.argv[1])
