tools/fix_date.sh

   1 #!/bin/sh
   2
   3 #  * Copyright 2004 Tristan Chabredier <wwp@claws-mail.org>
   4 #  *
   5 #  * This file is free software; you can redistribute it and/or modify it
   6 #  * under the terms of the GNU General Public License as published by
   7 #  * the Free Software Foundation; either version 3 of the License, or
   8 #  * (at your option) any later version.
   9 #  *
  10 #  * This program is distributed in the hope that it will be useful, but
  11 #  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12 #  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 #  * General Public License for more details.
  14 #  *
  15 #  * You should have received a copy of the GNU General Public License
  16 #  * along with this program; if not, write to the Free Software
  17 #  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18 #
  19 # fix_date.sh           helper script to fix non-standard date or add missing
  20 #                                       date header to emails
  21
  22 # usage: fix_date.sh <filename> [<filename>..]
  23 # It will replace the Date: value w/ the one picked up from more recent
  24 # Fetchinfo time header, Received: field.. Otherwise, it will take the file
  25 #  modification time (using a RFC 2822-compliant form).
  26 # Any already existing X-Original-Date is kept, if missing we're adding it
  27 # if the Date: was set (even if set w/ non conform value)
  28
  29 # TODO: fallback to X-OriginalArrivalTime: ?
  30
  31 VERSION="0.1.2"
  32
  33
  34 version()
  35 {
  36         echo "$VERSION"
  37         exit 0
  38 }
  39
  40 usage()
  41 {
  42         echo "usage:"
  43         echo "  ${0##*/} [<switches>] <filename> [<filename> ..]"
  44         echo "switches:"
  45         echo "  --help     display this help then exit"
  46         echo "  --version  display version information then exit"
  47         echo "  --force    always force (re-)writing of Date: header"
  48         echo "  --rfc      force re-writing of Date: header when it's not RFC-compliant"
  49         echo "  --debug    turn on debug information (be more verbose)"
  50         echo "  --strict   use RFC-strict matching patterns for dates"
  51         echo "  --         end of switches (in case a filename starts with a -)"
  52         exit $1
  53 }
  54
  55 date_valid()
  56 {
  57         test $STRICT -eq 1 && \
  58                 REGEXP="$DATE_REGEXP_STRICT" || \
  59                 REGEXP="$DATE_REGEXP"
  60
  61         echo "$1" | grep -qEim 1 "$REGEXP"
  62         DATE_VALID=$?
  63 }
  64
  65 dump_date_fields()
  66 {
  67         test -z "$X_ORIGINAL_DATE" -a -n "$DATE" && \
  68                 echo "X-Original-Date:$DATE" >> "$TMP"
  69         echo "Date:$REPLACEMENT_DATE" >> "$TMP"
  70 }
  71
  72 # use --force to always (re-)write the Date header
  73 # otherwise, the Date header will be written if only it doesn't exist
  74 FORCE=0
  75 # use --rfc to (re-)write the Date header when it's not RFC-compliant
  76 # otherwise, the Date header will be written if only it doesn't exist
  77 RFC=0
  78 # use --debug to display more information about what's performed
  79 DEBUG=0
  80 # use --strict to use strict matching patterns for date validation
  81 STRICT=0
  82 # 0 = valid, always valid until --strict is used, then date_valid overrides this value
  83 DATE_VALID=0
  84
  85 while [ -n "$1" ]
  86 do
  87         case "$1" in
  88         --help)         usage 0;;
  89         --version)      version;;
  90         --force)        FORCE=1;;
  91         --debug)        DEBUG=1;;
  92         --rfc)          RFC=1;;
  93         --strict)       STRICT=1;;
  94         --)                     shift
  95                                 break;;
  96         -*)                     echo "error: unrecognized switch '$1'"
  97                                 usage 1;;
  98         *)                      break;;
  99         esac
 100         shift
 101 done
 102
 103 if [ $FORCE -eq 1 -a $RFC -eq 1 ]
 104 then
 105         echo "error: use either --force or --rfc, but not both at the same time"
 106         usage 1
 107 fi
 108
 109 test $# -lt 1 && \
 110         usage 1
 111
 112 TMP="/tmp/${0##*/}.tmp"
 113 HEADERS="/tmp/${0##*/}.headers.tmp"
 114 BODY="/tmp/${0##*/}.body.tmp"
 115
 116 DATE_REGEXP='( (Mon|Tue|Wed|Thu|Fri|Sat|Sun),)? [0-9]+ (Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec) [0-9]+ [0-9]+:[0-9]+:[0-9]+ [-+]?[0-9]+'
 117 DATE_REGEXP_STRICT='(Mon|Tue|Wed|Thu|Fri|Sat|Sun), [0-9]+ (Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec) [0-9]+ [0-9]+:[0-9]+:[0-9]+ [-+]?[0-9]+'
 118
 119 while [ -n "$1" ]
 120 do
 121         # skip if file is empty or doesn't exist
 122         if [ ! -s "$1" ]
 123         then
 124                 shift
 125                 continue
 126         fi
 127         SKIP=0
 128
 129         # split headers and body
 130         # get the empty line (separation between headers and body)
 131         SEP=`grep -nEm1 "^$" "$1" 2>/dev/null | cut -d ':' -f 1`
 132         if [ -z "$SEP" -o "$SEP" = "0" ]
 133         then
 134                 cp -f "$1" "$HEADERS"
 135                 :> "$BODY"
 136         else
 137                 sed -n '1,'`expr $SEP - 1`'p' "$1" > "$HEADERS"
 138                 sed '1,'`expr $SEP - 1`'d' "$1" > "$BODY"
 139         fi
 140
 141         # work on headers only
 142
 143         # get the Date and X-Original-Date
 144         X_ORIGINAL_DATE=`sed -n '/^X-Original-Date:/,/^[^\t]/p' "$HEADERS" | head -n -1 | cut -d ':' -f 2-`
 145         DATE=`sed -n '/^Date:/,/^[^\t]/p' "$HEADERS" | head -n -1 | cut -d ':' -f 2-`
 146
 147         # work on headers, minus Date and X-Original-Date
 148         test -n "$X_ORIGINAL_DATE" && \
 149                 sed -i '/^X-Original-Date:/,/^[^\t]/d' "$HEADERS"
 150         test -n "$DATE" && \
 151                 sed -i '/^Date:/,/^[^\t]/d' "$HEADERS"
 152
 153         # found a replacement date in Fetchinfo headers
 154         FETCH_DATE=`grep -im1 'X-FETCH-TIME: ' "$HEADERS" | cut -d ' ' -f 2-`
 155
 156         # or in Received: headers ..
 157         test $STRICT -eq 1 && \
 158                 REGEXP="$DATE_REGEXP" || \
 159                 REGEXP="$DATE_REGEXP_STRICT"
 160         RECEIVED_DATE=`sed -n '/^Received:/,/^[^\t]/p' "$HEADERS" | head -n -1 | grep -Eoim 1 "$REGEXP"`
 161
 162         # .. or from FS
 163         FILE_DATE=`LC_ALL=POSIX LANG=POSIX ls -l --time-style="+%a, %d %b %Y %X %z" "$1" | tr -s ' ' | cut -d ' ' -f 6-11`
 164         # we could also use the system date as a possible replacement
 165         SYSTEM_DATE="`date -R`"
 166
 167         # determine which replacement date to use
 168         if [ -z "$FETCH_DATE" ]
 169         then
 170                 if [ -z "$RECEIVED_DATE" ]
 171                 then
 172                         # don't forget the leading whitespace here
 173                         REPLACEMENT_DATE=" $FILE_DATE"
 174                         REPLACEMENT="file date"
 175 #                       REPLACEMENT_DATE=" $SYSTEM_DATE"
 176 #                       REPLACEMENT="system date"
 177                 else
 178                         REPLACEMENT_DATE="$RECEIVED_DATE"
 179                         REPLACEMENT="received date"
 180                 fi
 181         else
 182                 # don't forget the leading whitespace here
 183                 REPLACEMENT_DATE=" $FETCH_DATE"
 184                 REPLACEMENT="Fetchinfo time header"
 185         fi
 186
 187         # ensure that the original X-Original-Date is kept
 188         :> "$TMP"
 189         if [ -n "$X_ORIGINAL_DATE" ]
 190         then
 191                 echo "X-Original-Date:$X_ORIGINAL_DATE" >> "$TMP"
 192         fi
 193
 194         # replace/set the date and write all lines
 195         test $RFC -eq 1 && \
 196                 date_valid "$DATE"
 197         if [ -z "$DATE" ]
 198         then
 199                 test $DEBUG -eq 1 && \
 200                         echo "$1: date not found, using $REPLACEMENT now"
 201                 dump_date_fields
 202         else
 203                 if [ $FORCE -eq 1 ]
 204                 then
 205                         test $DEBUG -eq 1 && \
 206                                 echo "$1: date already found, replacing with $REPLACEMENT"
 207                         dump_date_fields
 208                 else
 209                         if [ $RFC -eq 1 ]
 210                         then
 211                                 if [ $DATE_VALID -ne 0 ]
 212                                 then
 213                                         test $DEBUG -eq 1 && \
 214                                                 echo "$1: date already found but not RFC-compliant, replacing with $REPLACEMENT"
 215                                         dump_date_fields
 216                                 else
 217                                         test $DEBUG -eq 1 && \
 218                                                 echo "$1: date already found and RFC-compliant, skipping"
 219                                         SKIP=1
 220                                 fi
 221                         else
 222                                 test $DEBUG -eq 1 && \
 223                                         echo "$1: date already found, skipping"
 224                                 SKIP=1
 225                         fi
 226                 fi
 227         fi
 228
 229         if [ $SKIP -eq 0 ]
 230         then
 231                 # uncomment the following line to backup the original file
 232                 #mv -f "$1" "$1.bak"
 233
 234                 cat "$HEADERS" >> "$TMP"
 235                 cat "$BODY" >> "$TMP"
 236                 mv -f "$TMP" "$1"
 237                 if [ $? -ne 0 ]
 238                 then
 239                         echo "error while moving '$TMP' to '$1'"
 240                         exit 1
 241                 fi
 242         fi
 243         rm -f "$HEADERS" "$BODY" "$TMP" >/dev/null 2>&1
 244
 245         shift
 246 done
 247 exit 0