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auth.go
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auth.go
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package auth
import (
"fmt"
"log"
"os"
"time"
"github.com/dgrijalva/jwt-go"
"github.com/spf13/viper"
"golang.org/x/crypto/bcrypt"
)
// Used for validating header tokens.
var mySigningKey = []byte(viper.GetString("SIGNING_KEY"))
// Hash and Salt with bcrypt.
func HashAndSalt(pwd []byte) string {
hash, err := bcrypt.GenerateFromPassword(pwd, bcrypt.MinCost)
if err != nil {
log.Println(err)
}
return string(hash)
}
// Validate JWT token.
func ValidateToken(tokenString string) bool {
token, err := jwt.Parse(tokenString, func(token *jwt.Token) (interface{}, error) {
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("there was an error")
}
return []byte(mySigningKey), nil
})
if err != nil {
return false
}
return token.Valid
}
// Compare hashed password in db with input password.
func ComparePasswords(hashedPwd string, plainPwd []byte) bool {
byteHash := []byte(hashedPwd)
err := bcrypt.CompareHashAndPassword(byteHash, plainPwd)
// Return true if no errors.
return err == nil
}
// Generate JWT and return as string.
func GenerateJWT() (string, error) {
token := jwt.New(jwt.SigningMethodHS256)
claims := token.Claims.(jwt.MapClaims)
claims["authorized"] = true
claims["client"] = "sermoapi"
claims["exp"] = time.Now().Add(time.Minute * 30).Unix()
if os.Getenv("ENV") == "prod" {
mySigningKey = []byte(os.Getenv("SIGNING_KEY"))
}
tokenString, err := token.SignedString(mySigningKey)
if err != nil {
// fmt.Errorf("Something Went Wrong: %s", err.Error())
return "", err
}
return tokenString, nil
}