#!/bin/bash

#############################################################################
###
### this script creates a bi-directional application link between a Jira 
### and a Confluence instance.
### 
### Simply provide base URLs for both applications as well as a user account
### with admin privileges on both systems.
###
### (c) 2018 anaron GmbH
### Author(s): Korbinian Weidinger 
###            Heinz Jürgen Letsch
###
#############################################################################


########## DEFAULTS/PARAMETERS #########
JIRAAPPLABEL="Jira Schulungsumgebung"
CONFAPPLABEL="Confluence Schulungsumgebung"
CHEADER=/tmp/cheader
CURLVERBOSITY="-s -S -w %{http_code}"
CURLVERBOSITY="-s -S "

for i in "$@"
do
    case $i in
    -j=*|--JIRA=*)
        JIRA="${i#*=}"
        ;;
    -l=*|--JIRAlabel=*)
        JIRAAPPLABEL="${i#*=}"
        ;;
    -c=*|--CONFLUENCE=*)
        CONFLUENCE="${i#*=}"
        ;;
    -k=*|--CONFLUENCElabel=*)
        CONFAPPLABEL="${i#*=}"
        ;;
    -u=*|--username=*)
        USERNAME="${i#*=}"
        ;;
    -p=*|--password=*)
        PASSWORD="${i#*=}"
        ;;
    -d|--debug)
        debug=true
        CURLVERBOSITY="-D /tmp/header"
        ;;
    *)
        # unknown option
        ;;
    esac
done

if [[ "$debug" == "true" ]]
then
        echo "jira:        $JIRA"
        echo "confluence:  $CONFLUENCE"
        echo "username:    $USERNAME"
        echo "password:    $PASSWORD"
        echo "jiraLabel:   $JIRAAPPLABEL"
        echo "confLabel:   $CONFAPPLABEL"
        echo
        curlverbosity="-D ${CHEADER} -w %{http_code}" # save response header in debug mode
        curlverbosity="-D ${CHEADER} " # save response header in debug mode
fi



####################  FUNCTIONS  ###################

###
# show brief parameter summary
###
usage() {
  echo -e "\nUsage:\n$0 \n\
     -u|--username=<username> \n\
     -p|--password=<password> \n\
     -j|--jira=<jiraURL> \n\
     -c|--confluence=<confluenceURL> \n\
     [-l|--jiralabel=<jiraAppLabel>] \n\
     [-k|--confluencelabel=<confluenceAppLabel>]\n"
}


###
# perform oauth authentication for given token/id
# params: baseUrl id
###
doOauth()
{
    response=$(curl ${CURLVERBOSITY} -u ${USERNAME}:${PASSWORD} -X PUT $1/rest/applinks/3.0/status/$2/oauth \
      -H 'content-type: application/json' \
      -H "origin: $1" \
      -d '{"incoming":{"enabled":true,"twoLoEnabled":true,"twoLoImpersonationEnabled":true},"outgoing":{"enabled":true,"twoLoEnabled":true,"twoLoImpersonationEnabled":true}}')
    if [[ "${debug}" == "true" ]]; then
        cat ${CHEADER}
        echo ${response}
    fi
}


###
# create an application link entity
# params: baseUrl schema
###
createAppLink()
{
    response=$(curl  ${CURLVERBOSITY} \
        -u ${USERNAME}:${PASSWORD} \
        -H "X-Atlassian-Token: no-check" \
        -H "Origin: $1" \
        -H "Content-Type: application/json" \
        -X POST $1/rest/applinks/3.0/applicationlinkForm/createAppLink \
        -d "$2"
    )
    if [[ "${debug}" == "true" ]]; then
        echo ${CHEADER}
        echo ${response}
    fi
    
    id=$(echo ${response} | grep -oP '(?<=<id>).*?(?=</id>)')
    if [[ -z ${id} ]]; then

        $(echo {$response} | grep -oPq '502 Bad Gateway')
        badGW=$?;
        $(echo {$response} | grep -oPq 'error status=\"400\"') 
        exists=$?;
        if [ "$badGW" == "0" ]; then
            echo "    error: instance not running!"
	else
            if [ "$exists" == "0" ]; then
                echo "    link already exists"
	    else
                echo "ERROR: could not create app link on $1: ${response}"
	    fi
	fi
        exit 1;
    fi
    #echo "got applink ID: ${id}"
    doOauth $1 ${id}
}


###
# prepare required data for applink creation
# params: application appLabel baseUrlLink
#     application: jira|confluence
#     appLabel:    label of applink shown in admin GUI
#     baseUrlLink: baseURL of system to be linked to 
###
getApplinkSchema(){
    echo "{
    \"applicationLink\":
        {
        \"typeId\":\"$1\",
        \"name\":\"$2\",
        \"displayUrl\":\"$3\",
        \"rpcUrl\":\"$3\",
        \"isPrimary\":true,
        \"isSystem\":false
        },
    \"username\":\"$username\",
    \"password\":\"$password\",
    \"customRpcURL\":false,
    \"rpcUrl\":\"null\",
    \"createTwoWayLink\":false,
    \"orphanedTrust\":null,
    \"configFormValues\":
        {
        \"trustEachOther\":true,
        \"shareUserbase\":true
        }
    }"
}



####################  BODY  ###################

###
# check if required parameters are set
###
if [[ -z "${JIRA}" ]] || [[ -z "${CONFLUENCE}" ]] || [[ -z "${USERNAME}" ]] || [[ -z "${PASSWORD}" ]]
then
    usage
    exit 1
fi


### 
# create link on both systems
###
createAppLink ${JIRA}       "$(getApplinkSchema "confluence" "${CONFAPPLABEL}"  "${CONFLUENCE}")"
createAppLink ${CONFLUENCE} "$(getApplinkSchema "jira"       "${JIRAAPPLABEL}"  "${JIRA}")"