gopay/internal/router/api/v1/account/login.go

package account

import (
	"git.supernets.org/perp/gopay/internal/context"
	"git.supernets.org/perp/gopay/internal/jwt"
	v1 "git.supernets.org/perp/gopay/internal/models/v1"
	"golang.org/x/crypto/bcrypt"
)

// @summary Login to an account
// @tags account
// @accept json
// @produce json
// @param register body v1.Register true "alice" "supersecretpassword"
// @success 200 {object} v1.Token
// @response default {object} v1.Error "There was an error"
// @router /v1/account/login [post]
func Login(ctx *context.Context) {
	// Store body
	var body *v1.Register

	// Bind JSON
	err := ctx.BindJSON(&body)
	if err != nil {
		ctx.Error(400, "MissingBody")
		return
	}

	// Select account by username
	account, err := ctx.Database.Account.SelectByUsername(body.Username)
	if err != nil {
		ctx.Error(500, "DatabaseError")
		return
	}

	// Compare username
	if account.Username != body.Username {
		ctx.Error(400, "InvalidUsername")
		return
	}

	// Compare password
	err = bcrypt.CompareHashAndPassword([]byte(account.Password), []byte(body.Password))
	if err != nil {
		ctx.Error(400, "InvalidPassword")
		return
	}

	// Generate token
	token, err := jwt.Encode(account.ID)
	if err != nil {
		ctx.Error(500, "InternalServerError")
		return
	}

	ctx.Token(token)
}