/
tokenauth.go
63 lines (55 loc) · 1.63 KB
/
tokenauth.go
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package middleware
import (
"crypto/subtle"
"net/http"
"github.com/pkg/errors"
"go.uber.org/zap"
httputils "github.com/foomo/keel/utils/net/http"
)
type (
TokenAuthOptions struct {
// TokenProvider function to retrieve the token
TokenProvider TokenProvider
}
TokenAuthOption func(*TokenAuthOptions)
)
// GetDefaultTokenAuthOptions returns the default options
func GetDefaultTokenAuthOptions() TokenAuthOptions {
return TokenAuthOptions{
TokenProvider: HeaderTokenProvider(),
}
}
// TokenAuthWithTokenProvider middleware option
func TokenAuthWithTokenProvider(v TokenProvider) TokenAuthOption {
return func(o *TokenAuthOptions) {
o.TokenProvider = v
}
}
// TokenAuth middleware
func TokenAuth(token string, opts ...TokenAuthOption) Middleware {
options := GetDefaultTokenAuthOptions()
for _, opt := range opts {
if opt != nil {
opt(&options)
}
}
return TokenAuthWithOptions(token, options)
}
// TokenAuthWithOptions middleware
func TokenAuthWithOptions(token string, opts TokenAuthOptions) Middleware {
return func(l *zap.Logger, name string, next http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if value, err := opts.TokenProvider(r); err != nil {
httputils.UnauthorizedServerError(l, w, r, errors.Wrap(err, "failed to retrieve token"))
return
} else if value == "" {
httputils.UnauthorizedServerError(l, w, r, errors.New("missing token"))
return
} else if subtle.ConstantTimeCompare([]byte(value), []byte(token)) != 1 {
httputils.UnauthorizedServerError(l, w, r, errors.New("invalid token"))
return
}
next.ServeHTTP(w, r)
})
}
}