0b73b4aa47
This adds the backend API, as well as backend infrastructure, including autostarting and basic communication between the Goroutine + Application.
117 lines
2.3 KiB
Go
117 lines
2.3 KiB
Go
package jwtcore
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import (
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"encoding/base64"
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"errors"
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"fmt"
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"os"
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"strconv"
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"time"
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"git.terah.dev/imterah/hermes/api/dbcore"
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"github.com/golang-jwt/jwt/v5"
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)
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var (
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JWTKey []byte
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developmentMode bool
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)
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func SetupJWT() error {
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var err error
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jwtDataString := os.Getenv("HERMES_JWT_SECRET")
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if jwtDataString == "" {
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return fmt.Errorf("JWT secret isn't set (missing HERMES_JWT_SECRET)")
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}
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if os.Getenv("HERMES_JWT_BASE64_ENCODED") != "" {
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JWTKey, err = base64.StdEncoding.DecodeString(jwtDataString)
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if err != nil {
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return fmt.Errorf("failed to decode base64 JWT: %s", err.Error())
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}
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} else {
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JWTKey = []byte(jwtDataString)
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}
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if os.Getenv("HERMES_DEVELOPMENT_MODE") != "" {
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developmentMode = true
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}
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return nil
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}
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func Parse(tokenString string, options ...jwt.ParserOption) (*jwt.Token, error) {
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return jwt.Parse(tokenString, JWTKeyCallback, options...)
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}
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func GetUserFromJWT(token string) (*dbcore.User, error) {
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parsedJWT, err := Parse(token)
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if err != nil {
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if errors.Is(err, jwt.ErrTokenExpired) {
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return nil, fmt.Errorf("token is expired")
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} else {
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return nil, err
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}
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}
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audience, err := parsedJWT.Claims.GetAudience()
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if err != nil {
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return nil, err
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}
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if len(audience) < 1 {
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return nil, fmt.Errorf("audience is too small")
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}
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uid, err := strconv.Atoi(audience[0])
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if err != nil {
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return nil, err
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}
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user := &dbcore.User{}
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userRequest := dbcore.DB.Preload("Permissions").Where("id = ?", uint(uid)).Find(&user)
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if userRequest.Error != nil {
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return user, fmt.Errorf("failed to find if user exists or not: %s", userRequest.Error)
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}
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userExists := userRequest.RowsAffected > 0
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if !userExists {
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return user, fmt.Errorf("user does not exist")
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}
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return user, nil
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}
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func Generate(uid uint) (string, error) {
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timeMultiplier := 3
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if developmentMode {
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timeMultiplier = 60 * 24
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}
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token := jwt.NewWithClaims(jwt.SigningMethodHS256, jwt.RegisteredClaims{
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ExpiresAt: jwt.NewNumericDate(time.Now().Add(time.Duration(timeMultiplier) * time.Minute)),
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IssuedAt: jwt.NewNumericDate(time.Now()),
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NotBefore: jwt.NewNumericDate(time.Now()),
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Audience: []string{strconv.Itoa(int(uid))},
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})
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signedToken, err := token.SignedString(JWTKey)
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if err != nil {
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return "", err
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}
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return signedToken, nil
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}
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func JWTKeyCallback(*jwt.Token) (interface{}, error) {
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return JWTKey, nil
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}
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