From c156ae475c9fde2ade6ce14664aa63700f106900 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Juhani=20Krekel=C3=A4?= Date: Wed, 14 Aug 2019 00:34:23 +0300 Subject: [PATCH] First commit --- webed.py | 264 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 264 insertions(+) create mode 100644 webed.py diff --git a/webed.py b/webed.py new file mode 100644 index 0000000..2633985 --- /dev/null +++ b/webed.py @@ -0,0 +1,264 @@ +#!/usr/bin/env python3 + +# ------------------------------------------------------------------ +# CC0 1.0 Universal +# # +# Statement of Purpose +# +# The laws of most jurisdictions throughout the world automatically confer +# exclusive Copyright and Related Rights (defined below) upon the creator and +# subsequent owner(s) (each and all, an "owner") of an original work of +# authorship and/or a database (each, a "Work"). +# +# Certain owners wish to permanently relinquish those rights to a Work for the +# purpose of contributing to a commons of creative, cultural and scientific +# works ("Commons") that the public can reliably and without fear of later +# claims of infringement build upon, modify, incorporate in other works, reuse +# and redistribute as freely as possible in any form whatsoever and for any +# purposes, including without limitation commercial purposes. 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Should any part of the +# License for any reason be judged legally invalid or ineffective under +# applicable law, such partial invalidity or ineffectiveness shall not +# invalidate the remainder of the License, and in such case Affirmer hereby +# affirms that he or she will not (i) exercise any of his or her remaining +# Copyright and Related Rights in the Work or (ii) assert any associated claims +# and causes of action with respect to the Work, in either case contrary to +# Affirmer's express Statement of Purpose. +# +# 4. Limitations and Disclaimers. +# +# a. No trademark or patent rights held by Affirmer are waived, abandoned, +# surrendered, licensed or otherwise affected by this document. +# +# b. Affirmer offers the Work as-is and makes no representations or warranties +# of any kind concerning the Work, express, implied, statutory or otherwise, +# including without limitation warranties of title, merchantability, fitness +# for a particular purpose, non infringement, or the absence of latent or +# other defects, accuracy, or the present or absence of errors, whether or not +# discoverable, all to the greatest extent permissible under applicable law. +# +# c. Affirmer disclaims responsibility for clearing rights of other persons +# that may apply to the Work or any use thereof, including without limitation +# any person's Copyright and Related Rights in the Work. Further, Affirmer +# disclaims responsibility for obtaining any necessary consents, permissions +# or other rights required for any use of the Work. +# +# d. Affirmer understands and acknowledges that Creative Commons is not a +# party to this document and has no duty or obligation with respect to this +# CC0 or use of the Work. +# +# For more information, please see +# +# ------------------------------------------------------------------ + +import base64 +import html +import http.server +import os +import sys +import urllib.parse + +files = {} + +def gen_id(): + return base64.urlsafe_b64encode(os.urandom(48 * 6 // 8)).decode() + +def process_file(file_id): + r = [] + for line in files[file_id]: + r.append('%s' % html.escape(line)) + + return '\n'.join(r) + +def run_command(keyvalues): + file_id = keyvalues['id'][-1] + cmd = keyvalues['cmd'][-1] + linenum = int(keyvalues['linenum'][-1]) + + assert cmd in ['append', 'delete'] + + if cmd == 'append': + line = keyvalues['line'][-1] + before = files[file_id][:linenum] + after = files[file_id][linenum:] + files[file_id] = before + [line] + after + + elif cmd == 'delete': + assert 0 < linenum <= len(files[file_id]) + del files[file_id][linenum - 1] + +class WebEd(http.server.BaseHTTPRequestHandler): + def redirect(self, path): + self.send_response(303) + self.send_header('Content-Type', 'text/plain; charset=utf-8') + self.send_header('Content-Length', 0) + self.send_header('Location', path) + self.end_headers() + + def send_html(self, html, status_code = 200): + encoded = html.encode('utf-8') + length = len(encoded) + + self.send_response(status_code) + self.send_header('Content-Type', 'text/html; charset=utf-8') + self.send_header('Content-Length', length) + self.end_headers() + + self.wfile.write(encoded) + + def do_GET(self): + url, _, keyvalues = self.path.partition('?') + keyvalues = urllib.parse.parse_qs(keyvalues) + + if url == '/' and 'id' not in keyvalues: + # Generate new ID + file_id = gen_id() + self.redirect('%s?id=%s' % (url, file_id)) + + elif 'id' not in keyvalues: + self.send_html(""" + + + + 404 Not Found + + +

404 Not Found

+ + + """, 404) + + else: + file_id = keyvalues['id'][-1] + + if file_id not in files: + files[file_id] = [] + + if 'cmd' in keyvalues: + try: + run_command(keyvalues) + + except Exception as err: + self.send_html(""" + + + + 400 Bad Request + + +

400 Bad Request

+ + + """, 400) + return + + self.redirect('%s?id=%s' % (url, file_id)) + + self.send_html(""" + + + WebEd + + + +

+ 

%s
+

+

+

+ +
    +
  • + + +
    • +
  • + + +
    • +
+ + + + +
+

+ + """ % (process_file(file_id), file_id, len(files[file_id]), len(files[file_id]))) + +def main(): + http.server.HTTPServer(('', int(sys.argv[1])), WebEd).serve_forever() + +if __name__ == '__main__': + main()