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jwt.go
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jwt.go
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package jwt_model
import (
"crypto/rsa"
"encoding/json"
"github.com/apibrew/apibrew/pkg/errors"
"github.com/apibrew/apibrew/pkg/resource_model"
"github.com/apibrew/apibrew/pkg/util"
"github.com/golang-jwt/jwt/v4"
"github.com/google/uuid"
log "github.com/sirupsen/logrus"
"strings"
"time"
)
type JwtUserDetailsSignParams struct {
Key rsa.PrivateKey
UserDetails UserDetails
ExpiresAt time.Time
Issuer string
}
func JwtUserDetailsSign(params JwtUserDetailsSignParams, minimizeToken bool) (string, error) {
jit, err := uuid.NewRandom()
if err != nil {
log.Error(err)
return "", errors.InternalError.WithDetails(err.Error())
}
claims := &JwtUserClaims{
Issuer: params.Issuer,
Subject: params.UserDetails.Username,
Audience: []string{params.Issuer},
ExpiresAt: jwt.NewNumericDate(params.ExpiresAt),
NotBefore: jwt.NewNumericDate(time.Now()),
IssuedAt: jwt.NewNumericDate(time.Now()),
ID: jit.String(),
Username: params.UserDetails.Username,
Roles: params.UserDetails.Roles,
Permissions: params.UserDetails.Permissions,
UserId: params.UserDetails.UserId,
Scopes: prepareScopes(params.UserDetails.Permissions),
}
if minimizeToken {
claims.Permissions = nil
}
token := jwt.NewWithClaims(jwt.SigningMethodRS256, claims)
signedToken, err := token.SignedString(¶ms.Key)
if err != nil {
log.Error(err)
return "", errors.InternalError.WithDetails(err.Error())
}
return signedToken, nil
}
func prepareScopes(permissions []*resource_model.Permission) []string {
var scopes []string
var scopeMap = make(map[string]bool)
for _, permission := range permissions {
var scope = permissionToScope(permission)
if scope == "" {
continue
}
if _, ok := scopeMap[scope]; ok {
continue
}
scopes = append(scopes, scope)
scopeMap[scope] = true
}
return scopes
}
func preparePermissions(scopes []string) []*resource_model.Permission {
var permissions []*resource_model.Permission
for _, scope := range scopes {
permissions = append(permissions, scopeToPermission(scope))
}
return permissions
}
func permissionToScope(permission *resource_model.Permission) string {
var parts = []string{}
parts = append(parts, util.DePointer(permission.Namespace, ""))
parts = append(parts, util.DePointer(permission.Resource, ""))
parts = append(parts, string(permission.Operation))
if permission.RecordSelector != nil {
serializedRecordSelector, err := json.Marshal(permission.RecordSelector)
if err != nil {
log.Error(err)
} else {
parts = append(parts, string(serializedRecordSelector))
}
} else {
parts = append(parts, "")
}
if permission.Before != nil {
parts = append(parts, permission.Before.Format(time.RFC3339))
} else {
parts = append(parts, "")
}
if permission.After != nil {
parts = append(parts, permission.After.Format(time.RFC3339))
} else {
parts = append(parts, "")
}
if permission.User != nil {
parts = append(parts, permission.User.Username)
} else {
parts = append(parts, "")
}
if permission.Role != nil {
parts = append(parts, permission.Role.Name)
} else {
parts = append(parts, "")
}
parts = append(parts, string(permission.Permit))
return strings.Join(parts, ":")
}
func scopeToPermission(scope string) *resource_model.Permission {
parts := strings.Split(scope, ":")
if len(parts) != 9 {
return nil
}
var result = &resource_model.Permission{}
if parts[0] != "" {
result.Namespace = &parts[0]
}
if parts[1] != "" {
result.Resource = &parts[1]
}
if parts[2] != "" {
result.Operation = resource_model.PermissionOperation(parts[2])
}
if parts[3] != "" {
var recordSelector = new(resource_model.BooleanExpression)
err := json.Unmarshal([]byte(parts[3]), recordSelector)
if err != nil {
log.Error(err)
} else {
result.RecordSelector = recordSelector
}
}
if parts[4] != "" {
result.Before = new(time.Time)
*result.Before, _ = time.Parse(time.RFC3339, parts[4])
}
if parts[5] != "" {
result.After = new(time.Time)
*result.After, _ = time.Parse(time.RFC3339, parts[5])
}
if parts[6] != "" {
result.User = &resource_model.User{Username: parts[6]}
}
if parts[7] != "" {
result.Role = &resource_model.Role{Name: parts[7]}
}
if parts[8] != "" {
result.Permit = resource_model.PermissionPermit(parts[8])
}
return result
}
func JwtVerifyAndUnpackUserDetails(key rsa.PublicKey, tokenContent string) (*UserDetails, error) {
claims := new(JwtUserClaims)
_, err := jwt.ParseWithClaims(tokenContent, claims, func(token *jwt.Token) (interface{}, error) {
return &key, nil
})
if err != nil {
log.Error(err)
return nil, errors.InternalError.WithDetails(err.Error())
}
var permissions = claims.Permissions
if claims.Permissions == nil {
permissions = preparePermissions(claims.Scopes)
}
return &UserDetails{
UserId: claims.UserId,
Username: claims.Username,
Roles: claims.Roles,
Permissions: permissions,
}, nil
}