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// _ _
// __ _____ __ ___ ___ __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
// \ V V / __/ (_| |\ V /| | (_| | || __/
// \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
// Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
//
// CONTACT: [email protected]
//
package anonymous
import (
"net/http"
"strings"
"github.com/go-openapi/runtime"
"github.com/weaviate/weaviate/usecases/config"
)
// Client for anonymous access
type Client struct {
config config.AnonymousAccess
}
// New anonymous access client. Client.Middleware can be used as a regular
// golang http-middleware
func New(cfg config.Config) *Client {
return &Client{config: cfg.Authentication.AnonymousAccess}
}
// Middleware will fail unauthenticated requests if anonymous access is
// disabled. This middleware should run after all previous middlewares.
func (c *Client) Middleware(next http.Handler) http.Handler {
if c.config.Enabled {
// Anonymous Access is allowed, this means we don't have to validate any
// further, let's just return the original middleware stack
return next
}
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if hasBearerAuth(r) {
// if an OIDC-Header is present we can be sure that the OIDC
// Authenticator has already validated the token, so we don't have to do
// anything and can call the next handler.
next.ServeHTTP(w, r)
return
}
w.WriteHeader(401)
w.Write([]byte(
`{"code":401,"message":"anonymous access not enabled, please provide an auth scheme such as OIDC"}`,
))
})
}
func hasBearerAuth(r *http.Request) bool {
// The following logic to decide whether OIDC information is set is taken
// straight from go-swagger to make sure the decision matches:
// https://github.com/go-openapi/runtime/blob/109737172424d8a656fd1199e28c9f5cc89b0cca/security/authenticator.go#L208-L225
const prefix = "Bearer "
var token string
hdr := r.Header.Get("Authorization")
if strings.HasPrefix(hdr, prefix) {
token = strings.TrimPrefix(hdr, prefix)
}
if token == "" {
qs := r.URL.Query()
token = qs.Get("access_token")
}
//#nosec
ct, _, _ := runtime.ContentType(r.Header)
if token == "" && (ct == "application/x-www-form-urlencoded" || ct == "multipart/form-data") {
token = r.FormValue("access_token")
}
// End of go-swagger logic
return token != ""
}
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