#!/bin/bash

#####################################################################################################
# This script is meant to be used as a global smudge-clean filter for removing sensitive data       #
# from your commits.                                                                                #
#                                                                                                   #
# 1. Place this script in an acceisble path, i.e. ~/scripts/git-smudge-clean-filter.sh.             #
#                                                                                                   #
# 2. Populate the 'mapArr' using what you need hidden as the key, and the replacment as the value.  #
#    DO NOT use same values for multiple keys (this will work only in one direction).               #
#                                                                                                   #
# 3. Set up the filter with git (2 options):                                                        #
# 3.1. You can either add the following section in your global ~/.gitconfig file:                   #
#      [filter "reductScript"]                                                                      #
#          smudge = ~/scripts/git-smudge-clean-filter.sh smudge                                     #
#          clean = ~/scripts/git-smudge-clean-filter.sh clean                                       #
# 3.2. Or run the following command from you cli:                                                   #
#      git config --global filter.reductScript.smudge "~/scripts/git-smudge-clean-filter.sh smudge" #
#      git config --global filter.reductScript.clean "~/scripts/git-smudge-clean-filter.sh clean"   #
#                                                                                                   #
# 4. For every file type, in every repository you are working on, and need sensitive data removed,  #
#    add the 'filter=reductScript' property in the attributes file and you're good to go.           #
#    For example for filtering yaml files: `*.yaml text eol=lf filter=reductScript`.                #
#                                                                                                   #
#    Tip: for shared repositories, you can store your attributes in in '$GIT_DIR/info/attributes'   #
#         instead of the standard '.gitattributes' file.                                            #
#         Follow this https://git-scm.com/docs/gitattributes for more attibtues inforamtion.        #
#####################################################################################################

declare -A mapArr

mapArr["my-work-private-server.mywork.com"]="<reducted-work-server>"
mapArr["my-personal-private-server.myowndomain.org"]="<reducted-personal-server>"
mapArr["A*&#QAADDA(77##F"]="super-secret-token"
mapArr["oops@mypersonal.email"]="support@correct.email"

# mac users: use gsed instead of sed
sedcmd="sed"
if [[ "$1" == "clean" ]]; then
  for key in ${!mapArr[@]}; do
    sedcmd+=" -e \"s/${key}/${mapArr[${key}]}/g\""
  done  
elif [[ "$1" == "smudge" ]]; then
  for key in ${!mapArr[@]}; do
    sedcmd+=" -e \"s/${mapArr[${key}]}/${key}/g\""
  done  
else  
  echo "use smudge/clean as the first argument"
  exit 1
fi

eval $sedcmd