login.go

package cmdLogin

import (
	u "nexus-client/utils"
	g "nexus-client/globals"
)

import (
	"errors"
	"encoding/json"
)

type Login struct {
	Name string
}

func (cmd *Login)GetName() string {
	return cmd.Name
}

func (cmd *Login)GetDesc() []string {
	return []string{
		"Obtains an access token.",
		"Requires no capabilities."}
}

func (cmd *Login)PrintUsage() {
	for _, desc := range cmd.GetDesc() {
		u.PrintlnErr(desc)
	}
	u.PrintlnErr("USAGE: "+cmd.Name+" email password")
}

func (cmd *Login)Run(args []string) int {
	if len(args) != 2 {
		cmd.PrintUsage()
		return 1
	}

	email := args[0]
	pwd := args[1]
	token, err := GetToken(email, pwd)
	if err != nil {
		u.PrintlnErr("Error: "+err.Error())
		return 1
	}

	u.Println(token)
	return 0
}

// Returns the token if the authentication was successful or an error if it wasn't.
//
// curl -X POST http://localhost:8000/login -H 'Content-Type: application/json' -d '{"email": "johndoe@nexus.org", "pwd":"pipomolo"}'
// Returns a jwt token if authentication was successful:
// {"token":"<jwt token>"}
func GetToken(user string, pwd string) (string, error) {
	client := g.GetInstance().Client
	host := g.GetInstance().Host

	type LoginArgs struct {
		Email string
		Pwd string
	}

	loginArgs := &LoginArgs {user, pwd}
	resp, err := client.R().SetBody(loginArgs).Post(host+"/login")
    if err != nil {
		return "", err
	}

	if resp.IsSuccess() {
		type Response struct {
			Token string
		}
		var response Response
		err = json.Unmarshal(resp.Body(), &response)
		if err != nil {
			return "", err
		}
		return response.Token, nil
	} else {
		type Response struct {
			Message string
		}
		var response Response
		err = json.Unmarshal(resp.Body(), &response)
		if err != nil {
			return "", err
		}
		return "", errors.New(response.Message)
	}
}