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token_bearer.go
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token_bearer.go
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package auth
import (
"context"
"crypto/subtle"
"errors"
"fmt"
"net/http"
"github.com/gin-gonic/gin"
"github.com/justtrackio/gosoline/pkg/cfg"
"github.com/justtrackio/gosoline/pkg/ddb"
"github.com/justtrackio/gosoline/pkg/log"
)
const (
ByTokenBearer = "tokenBearer"
configBearerIdHeader = "api_auth_bearer_id_header"
configBearerTokenHeader = "api_auth_bearer_token_header"
AttributeToken = "token"
AttributeTokenBearerId = "tokenBearerId"
AttributeTokenBearer = "tokenBearer"
)
type TokenBearer interface {
GetToken() string
}
// A Getter retrieves a value from the store by the given key. If the value does
// not exist, false is returned and value is not modified.
// value should be a pointer to the model you want to retrieve.
type Getter func(ctx context.Context, key string, value TokenBearer) (bool, error)
type tokenBearerAuthenticator struct {
logger log.Logger
keyHeader string
tokenHeader string
provider TokenBearerProvider
}
type InvalidTokenErr struct{}
func (i InvalidTokenErr) Error() string {
return "invalid token"
}
func (i InvalidTokenErr) Is(err error) bool {
_, ok := err.(InvalidTokenErr)
return ok
}
func (i InvalidTokenErr) As(target interface{}) bool {
_, ok := target.(InvalidTokenErr)
// we don't have to write anything as our struct is always empty
return ok
}
type InvalidBearerErr struct {
Message string
}
func (i InvalidBearerErr) Error() string {
if i.Message != "" {
return i.Message
}
return "invalid bearer"
}
func (i InvalidBearerErr) As(target interface{}) bool {
err, ok := target.(*InvalidBearerErr)
if ok {
*err = i
}
return ok
}
type (
TokenBearerProvider func(ctx context.Context, key string, token string) (TokenBearer, error)
ModelProvider func() TokenBearer
)
func NewTokenBearerHandler(config cfg.Config, logger log.Logger, provider TokenBearerProvider) gin.HandlerFunc {
auth := NewTokenBearerAuthenticator(config, logger, provider)
return func(ginCtx *gin.Context) {
valid, err := auth.IsValid(ginCtx)
if valid {
return
}
if err == nil {
err = fmt.Errorf("the token wasn't valid nor was there an error")
}
ginCtx.JSON(http.StatusUnauthorized, gin.H{"err": err.Error()})
ginCtx.Abort()
}
}
func NewTokenBearerAuthenticator(config cfg.Config, logger log.Logger, provider TokenBearerProvider) Authenticator {
keyHeader := config.GetString(configBearerIdHeader)
tokenHeader := config.GetString(configBearerTokenHeader)
return NewTokenBearerAuthenticatorWithInterfaces(logger, keyHeader, tokenHeader, provider)
}
func NewTokenBearerAuthenticatorWithInterfaces(logger log.Logger, keyHeader string, tokenHeader string, provider TokenBearerProvider) Authenticator {
return &tokenBearerAuthenticator{
logger: logger,
keyHeader: keyHeader,
tokenHeader: tokenHeader,
provider: provider,
}
}
func (a *tokenBearerAuthenticator) IsValid(ginCtx *gin.Context) (bool, error) {
bearerId := ginCtx.GetHeader(a.keyHeader)
token := ginCtx.GetHeader(a.tokenHeader)
if token == "" {
return false, InvalidTokenErr{}
}
if bearerId == "" {
return false, &InvalidBearerErr{
Message: "bearer is empty",
}
}
bearer, err := a.provider(ginCtx.Request.Context(), bearerId, token)
if err != nil {
// if the provider responds with an invalid bearer error, don't mask it, maybe they want to communicate
// certain facts to the caller to help diagnose a problem (if their credentials are almost correct, and we can
// assume that an attack on them is unlikely)
bearerErr := InvalidBearerErr{}
if errors.As(err, &bearerErr) {
return false, bearerErr
}
return false, InvalidTokenErr{}
}
if bearer == nil {
return false, InvalidTokenErr{}
}
if subtle.ConstantTimeCompare([]byte(token), []byte(bearer.GetToken())) != 1 {
return false, InvalidTokenErr{}
}
user := &Subject{
Name: Anonymous,
Anonymous: true,
AuthenticatedBy: ByTokenBearer,
Attributes: map[string]interface{}{
AttributeToken: token,
AttributeTokenBearerId: bearerId,
AttributeTokenBearer: bearer,
},
}
RequestWithSubject(ginCtx, user)
return true, nil
}
func ProvideTokenBearerFromGetter(getter Getter, getModel ModelProvider) TokenBearerProvider {
return func(ctx context.Context, key string, _ string) (TokenBearer, error) {
m := getModel()
found, err := getter(ctx, key, m)
if err == nil && found {
return m, nil
}
return nil, err
}
}
func ProvideTokenBearerFromDdb(repo ddb.Repository, getModel ModelProvider) TokenBearerProvider {
return func(ctx context.Context, key string, _ string) (TokenBearer, error) {
m := getModel()
result, err := repo.GetItem(ctx, repo.GetItemBuilder().WithHash(key), m)
if err == nil && result.IsFound {
return m, nil
}
return nil, err
}
}