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#!/bin/sh
# Nginx Cache Manager (search, remove content by URL or grep)
# NOTE:
# in my nginx config, I use:
#   proxy_cache_key $scheme://$host$uri$is_args$args@$remote_user;
# ... which facilitates easier searching of cache files

cachefiles () {
  find /var/lib/nginx/cache -type f $@
}

# Apply proper regexp wildcards if the search isn't anchored
expando () {
  local OPTARG="$@";
    [ -z "${OPTARG##^*}" ] || OPTARG="(.*)${OPTARG}" 
    [ -z "${OPTARG%%*$}" ] || OPTARG="${OPTARG}(.*)" 
  echo "$OPTARG"
}

ALLTEXT='--binary-files=text'

filterfiles () {
  listonly='' nullsep=''
  while getopts :t:k:C:l0- OPT; do
    case $OPT in
      0) nullsep='-0';;
      l) listonly='-l';;
      t) xargs $nullsep grep $ALLTEXT $listonly -E "^Content-Type:\s+`expando ${OPTARG}`";;
      k) xargs $nullsep grep $ALLTEXT $listonly -E "^KEY:\s+`expando ${OPTARG}`";;
      C) xargs $nullsep grep $ALLTEXT $listonly "${OPTARG}";;
      -) break;;
    esac
  done
}

usage () {
cat <<EOF
  Usage: $0 <verb> <options>

  Examples:
    $0 flush                          delete all files from the cache
    $0 list [findopts]                list files in the cache (options go to 'find')
    $0 search -l -t 'text/css'        list all files with Content-Type: text/css
    $0 search -l -k '/site/core.js@'  list all files from URLs ending in '/site/core.js'
    $0 search -l -k 'blah'            list all files with URLs containing 'blah'
    $0 search -l -C "grep-pattern"    list all files matching pattern as found by grep
    $0 remove <options like search>


  Note:
    -l on search lists files. Leaving it off shows content.


EOF
}


mode=$1; shift;
case $mode in
  -h|help) usage;;
  flush) cachefiles -delete;;
  list) cachefiles "$@";; # Pass arguments directly to find
  search) cachefiles -print0 | filterfiles -0 "$@";;
  remove) cachefiles -print0 | filterfiles -0 -l "$@" | xargs -n rm -v;;
  filter) filterfiles "$@";; # allow the filter to be called externally
esac