#!/bin/bash
set -e

export PATH="/usr/bin:/bin:/usr/sbin:/sbin"

dest=/var/run/foodoor-keys
temp_outfile="$dest.tmp"


if [ ! -e "${dest}/.git/config" ]
then
  #echo "Repo does not exist, trying to clone..."
  ( cd /var/run && git clone --quiet --single-branch --depth=1 ssh://git.chaospott.de/Keyverwaltung/foodoor-keys.git "${dest}" )
else
  #echo "Repo exists, updating..."
  ( cd "${dest}" && git fetch --quiet && git merge --quiet origin/master master )
fi

rm -f ${temp_outfile}
  find "${dest}/keys" -name '*.pub' | sort | \
    while read keyfile
    do
      ssh-keygen -l -f ${keyfile} &> /dev/null
      if [ $? -eq 0 ]; then
        valid=false
        keyinfo=$(ssh-keygen -l -f ${keyfile}) # The whole key information
        crypto=$(echo "${keyinfo}" | sed 's/.*(\(.*\))/\1/') # Looks like "RSA" or "ED25519"
        key_length=$(echo "${keyinfo}" | cut -d" " -f1) 

        if [ "${crypto}" == "RSA" ]; then

          if [ ${key_length} -lt 4096 ]; then
            echo "Key size of key ${keyfile} not equal to 4096. Not adding it to key database." >&2
            continue
          else
            valid=true
          fi

        elif [ "${crypto}" == "ED25519" ]; then
          valid=true
        fi

        if [ "$valid" = true ]; then
          echo "command=\"/usr/sbin/foodoor \$action \",no-port-forwarding,no-X11-forwarding,no-agent-forwarding $(cat ${keyfile} | sed 's/\r//g') ${keyfile}" >> ${temp_outfile}
        fi
      fi
    done

for appendix in open close door
do
    action="$appendix"
    if [ "$appendix" = "door" ]; then
      action=""
    fi
    export action

    outfile="${dest}/authorized_keys.${appendix}"
    cat ${temp_outfile} |envsubst > ${outfile}
  
    # Oben und unten
    install -d -o ${appendix} -g nogroup -m 0700 /var/lib/foodoor/${appendix}/.ssh
    install -b -S .last -o ${appendix} -g nogroup -m 0600 ${outfile} /var/lib/foodoor/${appendix}/.ssh/authorized_keys
done