Backup Authentication

api_model.go

package main

type IdentityProviderLocation struct {
	ServerUrl string `json:"server_url"`
	Id        int    `json:"id"`
	Login     string `json:"login"`
}

type OpenIdentityProviderSessionResponse struct {
	AccessToken  string `json:"access_token"`
	RefreshToken string `json:"refresh_token"`
	IdToken      string `json:"id_token"`
	TokenType    string `json:"token_type"`
	Error        string `json:"error"`
}

main.go

package main

import (
	"encoding/json"
	"io/ioutil"
	"net/http"
	"net/url"
	"errors"
)

const (
	cloudRootUrl = "https://trueimage.acronis.com"

	testLogin    = "test45@mfsa.ru"
	testPassword = "qwe123QWE"
)

type IdentityProviderSession struct {
	IdToken      string
	RefreshToken string
}

func main() {
	result, err := retrieveIdentityProviderUrl(cloudRootUrl, testLogin)
	if err != nil {
		println("Error: " + err.Error())
		return
	}
	println(result)

	session, err := openIdentityProviderSession(result, testLogin, testPassword)
	if err != nil {
		println("Error: " + err.Error())
		return
	}

	println(session.IdToken)
}

func retrieveIdentityProviderUrl(cloudRootUrlStr, login string) (string, error) {
	cloudRootUrl, err := url.Parse(cloudRootUrlStr)
	if err != nil {
		return "", err
	}
	cloudRootUrl.Path += "/api/1/accounts"

	query := url.Values{}
	query.Add("login", login)
	cloudRootUrl.RawQuery = query.Encode()

	response, err := http.Get(cloudRootUrl.String())
	if err != nil {
		return "", err
	}
	defer response.Body.Close()

	data, err := ioutil.ReadAll(response.Body)
	if err != nil {
		return "", err
	}

	var providerLocation IdentityProviderLocation
	if err := json.Unmarshal(data, &providerLocation); err != nil {
		return "", err
	}

	return providerLocation.ServerUrl, nil
}

func openIdentityProviderSession(identityProviderUrlStr, userName, password string) (*IdentityProviderSession, error) {
	identityProviderUrl, err := url.Parse(identityProviderUrlStr)
	if err != nil {
		return nil, err
	}
	identityProviderUrl.Path += "/api/idp/v1/token"

	params := url.Values{}
	params.Add("grant_type", "password")
	params.Add("client_id", "backupAgent")
	params.Add("username", userName)
	params.Add("password", password)

	response, err := http.PostForm(identityProviderUrl.String(), params)
	if err != nil {
		return nil, err
	}
	defer response.Body.Close()

	data, err := ioutil.ReadAll(response.Body)
	if err != nil {
		return nil, err
	}

	var openSessionResponse OpenIdentityProviderSessionResponse
	if err := json.Unmarshal(data, &openSessionResponse); err != nil {
		return nil, err
	}

	if openSessionResponse.Error != "" {
		return nil, errors.New(openSessionResponse.Error)
	}

	return &IdentityProviderSession{openSessionResponse.IdToken, openSessionResponse.RefreshToken}, nil
}