skgat

#!/usr/bin/env bash

# Service Key - generate access token
# Pipe a JSON representation of a service key into this to get an access token

# Assumpiton
# UAA root is in the "url" property

# Test whnether JSON is valid, outputs  areturn code
# (zero if valid, non-zero otherwise)
# Usage: testjson <JSON>
function testjson (){
  echo $1 | jq empty 2>/dev/null
  echo $?
}

# Returns the value of given property (via jq)
# Usage: getprop <service key json> <property>
function getprop (){
    echo $1 | jq -r $2
}

# Get access token, using credential and endpoint
# in the supplied access key json
# Usage: get_access_token <service key json>
function get_access_token (){
    local json=$1

    local clientid=$(getprop "${json}" .clientid)
    local url=$(getprop "${json}" .url)
    local clientsecret=$(getprop "${json}" .clientsecret)

if [[ $2 == test ]]; then 
    echo "clientid:  ${clientid}"
    echo "clientsecret:  ${clientsecret}"
    echo "url:  ${url}"
fi



    curl \
        --silent \
        --data "grant_type=client_credentials" \
        --user "${clientid}:${clientsecret}" \
        "$(getprop "${json}" .url)/oauth/token" \
    | jq -r '.access_token'
}

# Main

sk=`cat /dev/stdin`


if [ $(testjson "${sk}") -ne "0" ]; then 
  >&2 echo "invalid JSON"
  exit 1
fi

get_access_token "${sk}"