etcd v3 gRPC gateway authentication and add new user example in bash.

add_user.sh

#!/bin/bash                                                                   
                                                                              
newuser=$1                                                                    
read -s -p "Enter password for $newuser" newpass                              
                                                                              
user=root                                                                     
pass=toor                                                                     
host=127.0.0.1                                                                
port=2379                                                                     
                                                                              
cacert="path/to/ca.pem"                                                         
key="path/to/client-key.pem"                                                    
cert="path/to/client.pem"                                                       
                                                                              
tokengen() {                                                                  
    json=$(printf '{"name": "%s", "password": "%s"}' \                        
        "$(escape "$1")" \                                                    
        "$(escape "$2")"                                                      
    )                                                                         
    curl -s --cacert $cacert \                                                
        --key $key \                                                          
        --cert $cert \                                                        
        -X POST \                                                             
        -d "$json" \                                                          
        https://${host}:${port}/v3beta/auth/authenticate \                    
       | jq -r '.token'                                                       
}                                                                                                                                                           
                                                                              
add_user() {                                                                  
    json=$(printf '{"name": "%s", "password": "%s"}' \                        
        "$(escape "$1")" \                                                    
        "$(escape "$2")"                                                      
    )                                                                         
    curl -s --cacert $cacert \                                                
        --key $key \                                                          
        --cert $cert \                                                        
        -H "Authorization: $3" \                                              
        -X POST \                                                             
        -d "$json" \                                                          
        https://${host}:${port}/v3beta/auth/user/add                          
}                                                                             
                                                                              
escape() {                                                                    
    echo "${1//\"/\\\"}"                                                      
}                                                                             
                                                                              
token=$(tokengen $user $pass)                                                 
add_user_response=$(add_user $newuser $newpass $token)                        
                                                                              
echo -e "\n$add_user_response"