#!/usr/bin/env bash
DELAY=1
configuredClient=""
currentVersion="1.14.0"

checkOpenSSL()
{
  if  ! command -v openssl &>/dev/null ;then
    echo "Error: to use this tool openssl must be installed" >&2
    return 1
  else
    return 0
  fi
}

getConfiguredClient()
{
    if  command -v curl &>/dev/null ; then
      configuredClient="curl"
    elif command -v wget &>/dev/null ; then
      configuredClient="wget"
    elif command -v fetch &>/dev/null ; then
      configuredClient="fetch"
    else
      echo "Error: This tool reqires either curl, wget, or fetch to be installed."
      return 1
    fi
}

## Allows to call the users configured client without if statements everywhere
httpGet()
{
  case "$configuredClient" in
    curl) curl -A curl -s "$@";;
    wget) wget -qO- "$@";;
    fetch) fetch -o "...";;
  esac
}

update()
{
  # Author: Alexander Epstein https://github.com/alexanderepstein
  # Update utility version 1.2.0
  # To test the tool enter in the defualt values that are in the examples for each variable
  repositoryName="Bash-Snippets" #Name of repostiory to be updated ex. Sandman-Lite
  githubUserName="alexanderepstein" #username that hosts the repostiory ex. alexanderepstein
  nameOfInstallFile="install.sh" # change this if the installer file has a different name be sure to include file extension if there is one
  latestVersion=$(httpGet https://api.github.com/repos/$githubUserName/$repositoryName/tags | grep -Eo '"name":.*?[^\\]",'| head -1 | grep -Eo "[0-9.]+" ) #always grabs the tag without the v option

  if [[ $currentVersion == "" || $repositoryName == "" || $githubUserName == "" || $nameOfInstallFile == "" ]];then
    echo "Error: update utility has not been configured correctly." >&2
    exit 1
  elif [[ $latestVersion == "" ]];then
    echo "Error: no active internet connection" >&2
    exit 1
  else
    if [[ "$latestVersion" != "$currentVersion" ]]; then
      echo "Version $latestVersion available"
      echo -n "Do you wish to update $repositoryName [Y/n]: "
      read -r answer
      if [[ "$answer" == "Y" || "$answer" == "y" ]] ;then
        cd  ~ || { echo 'Update Failed' ; exit 1 ; }
        if [[ -d  ~/$repositoryName ]]; then rm -r -f $repositoryName  ||  { echo "Permissions Error: try running the update as sudo"; exit 1; } ; fi
        git clone "https://github.com/$githubUserName/$repositoryName" || { echo "Couldn't download latest version" ; exit 1; }
        cd $repositoryName ||  { echo 'Update Failed' ; exit 1 ;}
        git checkout "v$latestVersion" 2> /dev/null || git checkout "$latestVersion" 2> /dev/null || echo "Couldn't git checkout to stable release, updating to latest commit."
        chmod a+x install.sh #this might be necessary in your case but wasnt in mine.
        ./$nameOfInstallFile "update" || exit 1
        cd ..
        rm -r -f $repositoryName ||  { echo "Permissions Error: update succesfull but cannot delete temp files located at ~/$repositoryName delete this directory with sudo"; exit 1; }
      else
        exit 1
      fi
    else
      echo "$repositoryName is already the latest version"
    fi
  fi

}

usage()
{
  echo "Siteciphers"
  echo "Description: Checks the available ciphers for the SSL of an https site."
  echo "Usage: siteciphers [flag] or siteciphers [optionalDFlag] [website]"
  echo "  -u Update Bash-Snippet Tools"
  echo "  -h Show the help"
  echo "  -v Get the tool version"
  echo "  -d Set the delay between requests sent to the site (default is 1 sec)"
  echo "Examples:"
  echo "  siteciphers github.com"
  echo "  siteciphers -d 0.5 github.com"
}

checkInternet()
{
  httpGet google.com > /dev/null 2>&1 || { echo "Error: no active internet connection" >&2; return 1; } # query google with a get request
}

checkCiphers()
{
  ciphers=$(openssl ciphers 'ALL:eNULL' | sed -e 's/:/ /g') # grab all ciphers
  SERVER=$1:443 # setup the connection server
  for cipher in ${ciphers[*]} # for all possible ciphers
  do
    result=$(echo | openssl s_client -cipher "$cipher" -connect $SERVER 2>&1)
    if [[ "$result" =~ ":error:" ]] ; then
      if [[ -z $2 ]]; then
        error=$(echo -n $result | cut -d':' -f6)
        echo "$cipher - NO ($error)"
      fi
    else
      if [[ "$result" =~ "Cipher is $cipher" || "$result" =~ "Cipher    :" ]] ; then
        echo "$cipher - YES"
      else
        if [[ -z $2 ]]; then
          echo "$cipher - UNKNOWN RESPONSE - $result"
        fi
      fi
    fi
    sleep $DELAY # sleep as to not overload the requests to the server
  done
}




checkOpenSSL || exit 1
getConfiguredClient || exit 1
checkInternet || exit 1


if [[ $# == "0" ]]; then
  usage
  exit 1
elif [[ $1 == "update" ]];then
  update
  exit 0
elif [[ $1 == "help" ]];then
  usage
  exit 0
fi

while getopts "huvd:" opt; do ## alows for using options in bash
  case $opt in
    \?)
      echo "Invalid option: -$OPTARG" >&2
      exit 1
    ;;
    d) #set the delay with the -d option
      DELAY=$OPTARG
      dFlag="1"
    ;;
    u)

      update
      exit 0
    ;;
    h)
      usage
      exit 0
    ;;
    v)
      echo "Version $currentVersion"
      exit 0
    ;;
    :) ## will run when no arguments are provided to to e or d options
      echo "Option -$OPTARG requires an argument." >&2
      exit 1
    ;;
  esac
done

if [[ $dFlag == "1" ]];then checkCiphers $3 || exit 1; # if dflag is present input will look like siteciphers -d 0.5 github.com making the website the third arg
else  checkCiphers $1 || exit 1; fi