Lambda clone, quick and dirty

#!/bin/bash

# Note, you have to have github over ssh configured
# has to be a git@github link
# you have to generate an api key token with the right to fork & add collaborators
# token gen link: https://github.com/settings/tokens

######
# Variables!
user=""
secretkey=""
branch_name=""
PMuser=""
project_parent_path=""
######

if [ -z "$user" ] || [ -z "$secretkey" ] || [ -z "$branch_name" ] || [ -z "$project_parent_path" ]
then
  echo "Empty variable, exiting script"
  exit
fi

# Fail gracefully
## Needs to check if git username
## Needs to check if API key valid
## Needs to check if inputted git repo is valid

# To check github ssh config on git failure
#ssh -q git@github.com &> /dev/null
#if [ $? = "1" ]
#then
#  echo "GitHub ssh is configured"
#else 
#  echo "Configure github ssh, no http fallback, exiting"
#  exit
#fi

giturl=$1
#echo -e "Input todays project git clone link:"
#read giturl

if [ -z "$giturl" ]
then
  exit
fi

if [[ $giturl = git@github.com* ]]
then
  strip1=${giturl##git@github.com:}
  strip2=${strip1%.git}
fi

if [[ $giturl = https://github.com* ]]
then
  strip1=${giturl##git@github.com:}
  strip2=${strip1%.git}
fi

if [[ $giturl != git@github.com* ]] && [[ $giturl != https://github.com* ]] 
then
  echo "Please provide valid github clone link, exiting"
  exit
fi

reponame=${strip2##*/}
giturluser=${strip2%/${reponame}}

printf "\nCloning: $reponame from User: $user\n"

curl -X POST -u "${user}:${secretkey}" \
    "https://api.github.com/repos/${giturluser}/${reponame}/forks"

cd $project_parent_path

git clone git@github.com:${user}/${reponame}.git

cd $reponame

git checkout -b "${branch_name}"
git push --set-upstream origin ${branch_name}

if [[ ! -z "$PMuser" ]]
then
  echo "adding ${PMuser} as collaborator"
  curl -i -u "${user}:${secretkey}" -X PUT -d "" "https://api.github.com/repos/${user}/${reponame}/collaborators/${PMuser}"
else
  echo "no PM string, no collaborator added" 
fi