Redirecting to search host...
If this fails, please click this link instead:
%s
\n""" % (searchurl, searchurl, unquote_plus(searchurl))
#------------------------------------------------------------------------
# Error checks, custom replies
#------------------------------------------------------------------------
if not site and not host and not term: # Nov-2020: check more inputs
print('Content-type: text/plain\n') # start reply = hdr + blankline=\n
print('Search parameters missing or invalid.') # text to show in browser, if any
elif not site:
print('Content-type: text/plain\n')
print('Search site missing or invalid.')
elif not host:
print('Content-type: text/plain\n')
print('Search host missing or invalid.')
elif not term:
print('Content-type: text/plain\n')
print('Please provide a search term.') # traps just missing for term
elif DEBUG:
# disply built link only
print('Content-type: text/plain\n') # start reply = hdr + blankline=\n
print(searchurl) # with encoded-and-escaped term
else:
#--------------------------------------------------------------------
# Valid and live: redirect client to a search-provider's site/page.
#
# Send the client an HTTP reply = [headers + blank line + HTML page]
# having a 'Location:' header line with a formatted search-query URL.
# The hosting site auto generates a 3xx status header if 'Location:'.
# Print HTML reply too, in case client doesn't redirect as planned.
#--------------------------------------------------------------------
#print('HTTP/1.1 302 Found') # <= added by host if 'Location:'
print('Location: %s' % searchurl) # cgi http redirect header
#print('Connection: close') # <= this seems optional or auto
print('Content-type: text/html; charset=UTF-8') # Sep-2020: add charset for body
print('') # '' else 2.X tuple sans __future__
#--------------------------------------------------------------------
# HTML page shown if 'Location:' header redirect fails (unlikely).
#
# Sep-2020: The original print() below produced a to-ASCII encoding
# exception in Python 3.X on Linux for all non-ASCII search terms;
# the redirect silenced the exception, but later log writes didn't
# happen. To fix, 3.X encodes manually and writes as bytes instead.
# Why: CGI scripts lack locale settings, so stdout defaults to ASCII.
#--------------------------------------------------------------------
if UsingPython2: # py2.X: already encoded bytes
print(manualredirect) # py2 stdout allows str of bytes
else: # py3.X: manually encode str
manualredirect = manualredirect.encode('utf8') # match charset header encoding
try:
sys.stdout.flush() # mar20: else headers last on 3.X
sys.stdout.buffer.write(manualredirect) # py3 stdout is str: use io layer
except:
print('Page error', repr(sys.exc_info()[1]), file=sys.stderr)
#--------------------------------------------------------------------
# Save search term (pre-encode) to flat file on server (Jan-2016).
#
# Open with exclusive lock for possibly concurrent web access.
# Encode str to bytes for Py 3.X, no-op on Py 2.X unless non-ASCII.
# Use permission 0200 for updates but inaccessibility on the web.
# Sep-2020: don't encode line in 2.X - encoding fails for non-ASCII.
#
# NOTE: the O_EXCL flag does _not_ suffice to lock the terms file
# for exclusive access on the web server. For tools that may, see
# Python's os.lockf(), fctl.flock(), and fctl.lockf(). This script
# assumes that writes are atomic (or won't overlap in practice).
#--------------------------------------------------------------------
try:
filename = SAVETERMSFILE
message = '[%s] [%s]' % (time.asctime(), unquote_plus(term)) # jan25
if not os.path.exists(filename):
open(filename, 'w').close() # make file first time
fd = os.open(filename, os.O_EXCL | os.O_APPEND | os.O_WRONLY) # binary on Unix
line = message + os.linesep
if UsingPython3:
line = line.encode('utf8') # Sep-2020: it's already encoded bytes in 2.X
os.write(fd, line)
os.close(fd)
except:
print('Log error', repr(sys.exc_info()[1]), file=sys.stderr) # to error_log
pass # neither server nor client care if this fails
# And the client reroutes to the search provider (which hopefully plays nice)