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Diffstat (limited to 'samples/mailto-form.pl')
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diff --git a/samples/mailto-form.pl b/samples/mailto-form.pl new file mode 100755 index 0000000..5afffc8 --- /dev/null +++ b/samples/mailto-form.pl @@ -0,0 +1,280 @@ +#! /usr/bin/perl -w +# Some scripts for handling mailto URLs within lynx via an interactive form +# +# Warning: this is a quick demo, to show what kinds of things are possible +# by hooking some external commands into lynx. Use at your own risk. +# +# Requirements: +# +# - Perl and CGI.pm. +# - A "sendmail" command for actually sending mail (if you need some +# other interface, change the code below in sub sendit appropriately). +# - Lynx compiled with support for lynxcgi, that means EXEC_CGI must have +# been defined at compilation, usually done with +# ./configure --enable-cgi-links +# - Lynx must have support for CERN-style rules as of 2.8.3, which must +# not have been disabled at compilation (it is enabled by default). +# +# Instructions: +# (This is for people without lynxcgi experience; if you are already +# use lynxcgi, you don't have to follow everything literally, use +# common sense for picking appropriate file locations in your situation.) +# +# - Make a subdirectory 'lynxcgi' under you home directory, i.e. +# mkdir ~/lynxcgi +# - Put this three script file mailto-form.pl there and make it +# executable. For example, +# cp mailto-form.pl ~/lynxcgi +# chmod a+x ~/lynxcgi/mailto-form.pl +# - Edit mailto-form.pl (THIS FILE), there are some strings that +# that need to be changed, see ### Configurable variables ### +# below. +# - Allow lynx to execute lynxcgi files in that directory, for example, +# put in your lynx.cfg file: +# TRUSTED_LYNXCGI:<tab>/home/myhomedir/lynxcgi/mailto-form.pl +# where <tab> is a real TAB character and you have to put the real +# location of your directory in place of "myhomedir", of course. +# The '~' abbreviation cannot be used. +# You could also just enable execution of all lynxcgi scripts, by +# not having any TRUSTED_LYNXCGI options in lynx.cfg at all, but +# that can't be recommended. +# - Tell lynx to actually use the lynxcgi scripts for mailto URLs. +# There are two variants: +# a) Redirect "mailto" +# Requires patched lynx, currently not yet in the developent code. +# Use the following two lines in the file that is configured as +# RULESFILE in lynxcfg: +# PermitRedirection mailto:* +# Redirect mailto:* lynxcgi:/home/myhomedir/lynxcgi/mailto-form.pl?from=myname@myhost&to=* +# You can also put them directly in lynx.cfg, prefixing each with +# "RULE:". Replace ""myhomedir", "myname", and "myhost" with your +# correct values, of course. +# b) Redirect "xmailto" +# Requires defining a fake proxy before starting lynx, like +# export xmailto_proxy=dummy # or for csh: setenv xmailto_proxy dummy +# Requires that you change "mailto" to "xmailto" each time you want +# to activate a mailto link. This can be done conveniently with +# a few keys: 'E', ^A, 'x', Enter. +# Use the following two lines in the file that is configured as +# RULESFILE in lynxcfg: +# PermitRedirection xmailto:* +# Redirect xmailto:* lynxcgi:/home/myhomedir/lynxcgi/mailto-form.pl?from=myname@myhost&to=* +# You can also put them directly in lynx.cfg, prefixing each with +# "RULE:". Replace ""myhomedir", "myname", and "myhost" with your +# correct values, of course. +# +# Limitations: +# +# - Only applies to mailto URLs that appear as links or are entered at +# a 'g'oto prompt. Does not apply to other ways of sending mail, like +# the 'c' (COMMENT) key, mailto as a FORM action, or mailing a file +# from the 'P'rinting Options screen. +# - Nothing is done for charset labelling, content-transfer-encoding +# of non-ASCII characters, and other MIME niceties. +# +# Klaus Weide 20000712 + +######################################################################## +########## Configurable variables ###################################### + +$SENDMAIL = '/usr/sbin/sendmail'; +# The location of your sendmail binary +$SELFURL = 'lynxcgi:/home/lynxdev/lynxcgi/mailto-form.pl'; +# Where this script lives in URL space +$SEND_TOKEN = '/vJhOp6eQ'; +# When found in the PATH_INFO part of the URL, +# this causes the script to actually send mail +# by calling $SENDMAIL instead of just throwing +# up a form. CHANGE IT! And don't tell anyone! +# Treat it like a password. +# Must start with '/', probably should have only +# alphanumeric ASCII characters. + +## Also, make sure the first line of this script points +## to your PERL binary + +########## Nothing else to change - I hope ############################# +######################################################################## + +use CGI; + +$|=1; + +### Upcase first character +##sub ucfirst { +## s/^./\U$1/; +##} + +# If there are multiple occurrences of the same thing, how to join them +# into one string +%joiner = (from => ', ', + to => ', ', + cc => ', ', + subject => '; ', + body => "\n\n" + ); +sub joiner { + my ($key) = @_; + if ($joiner{$key}) { + $joiner{$key}; + } else { + " "; + } +} + +# Here we check whether this script is called for actual sending, rather +# than form generation. If so, all the rest is handled by sub sendit, below. +$pathinfo = $ENV{'PATH_INFO'}; +if (defined($pathinfo) && $pathinfo eq $SEND_TOKEN) { + $q = new CGI; + print $q->header('text/plain'); + sendit(); + exit; +} + +$method = $ENV{'REQUEST_METHOD'}; +$querystring = $ENV{'QUERY_STRING'}; +if ($querystring) { + if ($method && $method eq "POST" && $ENV{'CONTENT_LENGTH'}) { + $querystring =~ s/((^|\&)to=[^?&]*)\?/$1&/; + $q0 = new CGI; + $q = new CGI($querystring); + @fields = $q0->param(); + foreach $key (@fields) { + @vals = $q0->param($key); +# print "Content-type: text/html\n\n"; +# print "Appending $key to \$q...\n"; + $q->append($key, @vals); +# print "<H2>Current Values in \$q0</H2>\n"; +# print $q0->dump; +# print "<H2>Current Values in \$q</H2>\n"; +# print $q->dump; + + } + + } else { + $querystring =~ s/((^|\&)to=[^?&]*)\?/$1&/; + $q = new CGI($querystring); + } +} else { + $q = new CGI; +} + +print $q->header; + +$long_title = $ENV{'QUERY_STRING'}; +$long_title =~ s/^from=([^&]*)\&to=//; +$long_title = "someone" unless $long_title; +$long_title = "Compose mail for $long_title"; +if (length($long_title) > 72) { + $title = substr($long_title,0,72) . "..."; +} else { + $title = $long_title; +} +$long_title =~ s/&/&/g; +$long_title =~ s/</</g; +print + $q->start_html($title), "\n", + $q->h1($long_title), "\n", + $q->start_form(-method=>'POST', -action => $SELFURL . $SEND_TOKEN), "\n"; + +print "<TABLE>\n"; +@fields = $q->param(); +foreach $key (@fields) { + @vals = $q->param($key); + if (scalar(@vals) != 1) { + print "multiple values " . scalar(@vals) ." for $key!\n"; + $q->param($key, join (joiner($key), @vals)); + } +} +foreach $key (@fields) { + $_ = lc($key); + if ($_ ne $key) { + print "noncanonical case for $key!\n"; + $val=$q->param($key); + $q->delete($key); + if (!$q->param($_)) { + $q->param($_, $val); + } else { + $q->param($_, $q->param($_) . joiner($_) . "$val"); + } + } +} +foreach $key ('from', 'to', 'cc', 'subject') { + print $q->Tr, + $q->td(ucfirst($key) . ":"), + $q->td($q->textfield(-name=>$key, + -size=>60, + -default=>$q->param($key))), "\n"; + $q->delete($key); +} + +# Also pass on any unrecognized header fields that were specified. +# This may not be a good idea for general use! +# At least some dangerous header fields may have to be suppressed. +@keys = $q->param(); +if (scalar(@keys) > (($q->param('body')) ? 1 : 0)) { + print "<TR><TD colspan=2><EM>Additional headers:</EM>\n"; + foreach $key ($q->param()) { + if ($key ne 'body') { + print $q->Tr, + $q->td(ucfirst($key) . ":"), + $q->td($q->textfield(-name=>$key, + -size=>60, + -default=>$q->param($key))), "\n"; + } + } +} +print "</TABLE>\n"; +print $q->textarea(-name=>'body', + -default=>$q->param('body')), "\n"; +print "<PRE>\n\n</PRE>", "\n", + $q->submit(-value=>"Send the message"), "\n", + $q->endform, "\n"; + +print "\n"; +exit; + +# This is for header field values. +sub sanitize_field_value { + my($val) = @_; + $val =~ s/\0/./g; + $val =~ s/\r\n/\n/g; + $val =~ s/\r/\n/g; + $val =~ s/\n*$//g; + $val =~ s/\n+/\n/g; + $val =~ s/\n(\S)/\n\t$1/g; + $val; +} + +sub sendit { + open (MAIL, "| $SENDMAIL -t -oi -v") || die ("$0: Can't run sendmail: $!\n"); + @fields = $q->param(); + foreach $key (@fields) { + @vals = $q->param($key); + if (scalar(@vals) != 1) { + print "multiple values " . scalar(@vals) ." for $key!\n"; + $q->param($key, join (joiner($key), @vals)); + } + } + foreach $key (@fields) { + if ($key ne 'body') { + if ($key =~ /[^A-Za-z0-9_-]/) { + print "$0: Ignoring malformed header field named '$key'!\n"; + next; + } + print MAIL ucfirst($key) . ": " . + sanitize_field_value($q->param($key)) . "\n" + or die ("$0: Feeding header to sendmail failed: $!\n"); + } + } + print MAIL "\n" + or die ("$0: Ending header for sendmail failed: $!\n"); + print MAIL $q->param('body'), "\n" + or die ("$0: Feeding body to sendmail failed: $!\n"); + close(MAIL) + or warn $! ? "Error closing pipe to sendmail: $!" + : ($? & 127) ? ("Sendmail killed by signal " . ($? & 127) . + ($? & 127) ? ", core dumped" : "") + : "Return value " . ($? >> 8) . " from sendmail"; +} |