bti-shrink-urls

   1 #!/bin/bash
   2 # Copyright (C) 2009 Bart Trojanowski <bart@jukie.net>
   3 #
   4 # This program is free software; you can redistribute it and/or modify it
   5 # under the terms of the GNU General Public License as published by the
   6 # Free Software Foundation version 2 of the License.
   7 #
   8 # This program is distributed in the hope that it will be useful, but
   9 # WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11 # General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License along
  14 # with this program; if not, write to the Free Software Foundation, Inc.,
  15 # 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  16
  17 needs_escape=true
  18
  19 while test -n "$1" ; do
  20         word="$1"
  21         shift
  22         case "$word" in
  23             --escaped)
  24                 needs_escape=
  25                 ;;
  26             --help|-h)
  27                 cat <<END
  28 bti-shrink-urls - convert URLs to a shorter form using a web service
  29
  30     $0 [--escaped] [<url>]
  31
  32 Currently only http://2tu.us/ is supported.
  33 END
  34                 exit 0
  35                 ;;
  36             *)
  37                 URL=$word
  38                 ;;
  39         esac
  40 done
  41
  42 function convert_url() {
  43         local url=$1
  44         test -n "$url" || return 1
  45         test "${url%%:*}" = 'http' || return 1
  46
  47         local urllen="${#url}"
  48
  49         # http://en.wikipedia.org/wiki/Percent-encoding
  50         if test -n "$needs_escape" ; then
  51                 url=$(echo "$url" | sed -e 's/\%/%25/g' \
  52                                         -e 's/!/%21/g' \
  53                                         -e 's/*/%2A/g' \
  54                                         -e "s/'/%27/g" \
  55                                         -e 's/(/%28/g' \
  56                                         -e 's/)/%29/g' \
  57                                         -e 's/;/%3B/g' \
  58                                         -e 's/:/%3A/g' \
  59                                         -e 's/@/%40/g' \
  60                                         -e 's/&/%26/g' \
  61                                         -e 's/=/%3D/g' \
  62                                         -e 's/+/%2B/g' \
  63                                         -e 's/\$/%24/g' \
  64                                         -e 's/,/%2C/g' \
  65                                         -e 's,/,%2F,g' \
  66                                         -e 's/?/%3F/g' \
  67                                         -e 's/#/%23/g' \
  68                                         -e 's/\[/%5B/g' \
  69                                         -e 's/]/%5D/g')
  70         fi
  71
  72         # http://2tu.us/
  73         local submit="http://2tu.us/?save=y&url=$url"
  74
  75         local res=$(wget -q -O - "$submit" | awk -F"'" '/Your tight URL is:/ { print $2 }')
  76         if test "${res%%:*}" = 'http' -a "${#res}" -lt "$urllen" ; then
  77                 echo $res
  78                 return 0
  79         fi
  80         return 1
  81 }
  82
  83 function die() {
  84         echo >&2 $@
  85         exit 1
  86 }
  87
  88 if test -n "$URL" ; then
  89         convert_url "$URL" || die "Failed to shrink '$URL'"
  90         exit $?
  91 fi
  92
  93 test -t 0 && echo >&2 "Type in some urls and I'll try to shrink them for you..."
  94 while read line ; do
  95         convert_url "$line" || echo $line
  96 done