Obtain keycloak token

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{
  "host": "keycloak.your.domain.com",
  "realm": "your-realm-name",
  "username": "admin",
  "password": "admin123",
  "clientid": "name-of-your-client",
  "client_secret": "client_secret"
}

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#!/usr/bin/env bash

set -eou pipefail

HOST=$(cat $1 | jq -r .host)
REALM=$(cat $1 | jq -r .realm)
USERNAME=$(cat $1 | jq -r .username)
PASSWORD=$(cat $1 | jq -r .password)
CLIENTID=$(cat $1 | jq -r .clientid)
CLIENTSECRET=$(cat $1 | jq -r .client_secret)

curl -s -X POST \
    https://$HOST/realms/$REALM/protocol/openid-connect/token \
    -H 'Content-Type: application/x-www-form-urlencoded' \
    -d username=$USERNAME \
    -d password=$PASSWORD \
    -d grant_type=password \
    -d client_id=$CLIENTID \
    -d client_secret=$CLIENTSECRET

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./script.sh info.json
{"access_token":"eyJhbGciOiJSUzI1NiIsInR5cCIgO...BKESR8ybP9u7dsW8aMSEU21Fd8_ZcKA","token_type":"Bearer","not-before-policy":0,"session_state":"b71c0226-64b8-4f39-bcf3-a8813ff6c9c2","scope":"profile email roles"}