#!/bin/bash

set +e

KEYSTONE_CONF=${KEYSTONE_CONF:-/etc/keystone/keystone.conf}

# Extract some info from Keystone's configuration file
if [[ -r "$KEYSTONE_CONF" ]]; then
    CONFIG_SERVICE_TOKEN=$(sed 's/[[:space:]]//g' $KEYSTONE_CONF | grep ^admin_token= | cut -d'=' -f2)
    CONFIG_ADMIN_PORT=$(sed 's/[[:space:]]//g' $KEYSTONE_CONF | grep ^admin_port= | cut -d'=' -f2)
fi

SERVICE_TOKEN=${SERVICE_TOKEN:-$CONFIG_SERVICE_TOKEN}
SERVICE_ENDPOINT=${SERVICE_ENDPOINT:-http://127.0.0.1:${CONFIG_ADMIN_PORT:-35357}/v2.0}
if [[ -z "$SERVICE_TOKEN" ]]; then
    echo "No service token found." >&2
    echo "Set SERVICE_TOKEN manually from keystone.conf admin_token." >&2
    exit 1
fi

set_admin_token() {
    alias keystone="keystone --token $SERVICE_TOKEN \
                             --endpoint $SERVICE_ENDPOINT"
}

unset_admin_token() {
    unalias keystone
}


get_data() {
    local match_column=$(($1 + 1))
    local regex="$2"
    local output_column=$(($3 + 1))
    shift 3

    echo $("$@" | \
           awk -F'|' \
               "! /^\+/ && \$${match_column} ~ \"^ *${regex} *\$\" \
                { print \$${output_column} }")
}

get_id () {
    get_data 1 id 2 "$@"
}

get_column_num() {
    local name=$1
    shift
    $@ | awk -F'|' "NR == 2 { for (i=2; i<NF; i++) if (\$i ~ \"^ *${name} *\$\") print (i - 1) }"
}

get_user() {
    local username=$1

    # Outut format of keystone user-list changed between essex and
    # folsom - the columns have been re-ordered (!?), so detect what
    # column to pass to get_data via get_column_num
    namecol=$(get_column_num name keystone user-list)

    local user_id=$(get_data $namecol $username 1 keystone user-list)

    if [ -n "$user_id" ]; then
        echo "Found existing $username user" >&2
        echo $user_id
    else
        echo "Creating $username user..." >&2
        get_id keystone user-create --name=$username \
                                    --pass="$SERVICE_PASSWORD" \
                                    --tenant_id $SERVICE_TENANT \
                                    --email=$username@example.com
    fi
}

add_role() {
    local user_id=$1
    local tenant=$2
    local role_id=$3
    local username=$4

    # The keystone argument format changed between essex and folsom
    # so we use the fact that the folsom keystone version has a new
    # option "user-role-list" to detect we're on that newer version
    # This also allows us to detect when the user already has the
    # requested role_id, preventing an error on folsom
    user_roles=$(keystone user-role-list \
                          --user_id $user_id\
                          --tenant_id $tenant 2>/dev/null)
    if [ $? == 0 ]; then
        # Folsom
        existing_role=$(get_data 1 $role_id 1 echo "$user_roles")
        if [ -n "$existing_role" ]
        then
            echo "User $username already has role $role_id" >&2
            return
        fi
        keystone user-role-add --tenant_id $tenant \
                           --user_id $user_id \
                           --role_id $role_id
    else
        # Essex
        keystone user-role-add --tenant_id $tenant \
                               --user $user_id \
                               --role $role_id
    fi
}

create_role() {
    local role_name=$1

    role_id=$(get_data 2 $role_name 1 keystone role-list)
    if [ -n "$role_id" ]
    then
        echo "Role $role_name already exists : $role_id" >&2
    else
        keystone role-create --name $role_name
    fi
}

get_endpoint() {
    local service_type=$1

    unset_admin_token
    keystone endpoint-get --service $service_type
    set_admin_token
}

delete_endpoint() {
    local service_type=$1

    case $service_type in
        volume) urlsuffix='\\\\$\\\\(tenant_id)s';;
        orchestration) urlsuffix='%[(]tenant_id[)]s';;
        # cloudformation has no hash suffix
        *) urlsuffix=''
    esac

    local url=$(get_data 1 "${service_type}[.]publicURL" 2 \
                get_endpoint $service_type 2>/dev/null | \
                sed -r "s/[a-f0-9]{32}/$urlsuffix/")

    if [ -n "$url" ]; then
        local endpoints=$(get_data 3 $url 1 keystone endpoint-list)

        for endpoint in $endpoints; do
            echo "Removing $service_type endpoint ${endpoint}..." >&2
            keystone endpoint-delete "$endpoint" >&2
        done

        if [ -z "$endpoints" ]; then false; fi
    else
        false
    fi
}

delete_all_endpoints() {
    while delete_endpoint $1; do
        true
    done
}

delete_service() {
    local service_type=$1

    delete_all_endpoints $service_type

    local service_ids=$(get_data 3 $service_type 1 keystone service-list)

    for service in $service_ids; do
        local service_name=$(get_data 1 $service 2 keystone service-list)
        echo "Removing $service_name:$service_type service..." >&2
        keystone service-delete $service >&2
    done
}

get_service() {
    local service_name=$1
    local service_type=$2
    local description="$3"

    delete_service $service_type

    get_id keystone service-create --name=$service_name \
                                   --type=$service_type \
                                   --description="$description"
}

add_endpoint() {
    local service_id=$1
    local url="$2"

    keystone endpoint-create --region RegionOne --service_id $service_id \
        --publicurl "$url" --adminurl "$url" --internalurl "$url" >&2
}

keystone_setup() {
    TENANT_ID=$(get_data 1 tenant_id 2 keystone token-get)
    set_admin_token

    ADMIN_ROLE=$(get_data 2 admin 1 keystone role-list)
    SERVICE_TENANT=$(get_data 2 service 1 keystone tenant-list)
    SERVICE_PASSWORD=${SERVICE_PASSWORD:-$OS_PASSWORD}
    SERVICE_HOST=${SERVICE_HOST:-localhost}

    if [[ "$SERVICE_PASSWORD" == "$OS_PASSWORD" ]]; then
        echo "Using the OS_PASSWORD for the SERVICE_PASSWORD." >&2
    fi

    if [[ "$SERVICE_HOST" == "localhost" ]]; then
        echo "Endpoints will be registered as localhost, but this usually won't work."
        echo  "Set SERVICE_HOST to a publically accessible hostname/IP instead."
    fi

    echo ADMIN_ROLE $ADMIN_ROLE
    echo SERVICE_TENANT $SERVICE_TENANT
    echo SERVICE_PASSWORD $SERVICE_PASSWORD
    echo SERVICE_TOKEN $SERVICE_TOKEN
    echo SERVICE_HOST $SERVICE_HOST

    HEAT_USERNAME="heat"
    HEAT_USERID=$(get_user $HEAT_USERNAME)
    echo HEAT_USERID $HEAT_USERID
    add_role $HEAT_USERID $SERVICE_TENANT $ADMIN_ROLE $HEAT_USERNAME

    # Create a special role which template-defined "stack users" are
    # assigned to in the engine when they are created, this allows them
    # to be more easily differentiated from other users (e.g so we can
    # lock down these implicitly untrusted users via RBAC policy)
    STACK_USER_ROLE="heat_stack_user"
    create_role $STACK_USER_ROLE

    HEAT_CFN_SERVICE=$(get_service heat-cfn cloudformation \
                       "Heat CloudFormation API")
    add_endpoint $HEAT_CFN_SERVICE "http://$SERVICE_HOST:8000/v1"

    HEAT_OS_SERVICE=$(get_service heat orchestration \
                      "Heat API")
    add_endpoint $HEAT_OS_SERVICE "http://$SERVICE_HOST:8004/v1/%(tenant_id)s"
}

if [[ ${BASH_SOURCE[0]} == ${0} ]]; then
    keystone_setup
fi