paste saver

#!/usr/bin/python
"""Save pasted text from my iPhone to files."""
import BaseHTTPServer
import cgi
import os
import sha

def run():
    BaseHTTPServer.test(PasteSaver, BaseHTTPServer.HTTPServer)

class PasteSaver(BaseHTTPServer.BaseHTTPRequestHandler):
    def do_GET(self, saved=None):
        self.send_response(200)
        self.send_header("Content-type", "text/html; charset=utf-8")
        self.end_headers()
        saved_txt = '<p>Saved as %s.</p>' % saved if saved is not None else ''
        self.wfile.write("""<!DOCTYPE html><title>paste saver</title>
            %s
            <form method="POST"><textarea name="paste"></textarea>
            <input type="submit"></form>""" % saved_txt)
        self.wfile.close()

    def do_POST(self):
        # You would think that knowing when the HTTP request ends
        # would be part of the functionality provided by
        # BaseHTTPServer or BaseHTTPRequestHandler, but no.
        length = self.headers.getheader('content-length')
        if length:
            text = self.rfile.read(int(length))
        else:
            text = self.rfile.read()
        self.do_GET(save(cgi.parse_qs(text).get('paste', [''])[0]))

def save(text):
    fname = sha.sha(text).hexdigest() + '.pasted.txt'
    tmpfname = '.%s.new' % fname
    with open(tmpfname, 'w') as fo:
        fo.write(text)
        fo.flush()
        os.fsync(fo)
    os.rename(tmpfname, fname)
    return fname

if __name__ == "__main__":
    run()