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package middleware
import (
"crypto/subtle"
"net/http"
"strings"
log "github.com/sirupsen/logrus"
)
// OptionallyRequireAdminAuth wraps a handler requiring HTTP basic auth
// using "uploader" as the username.
// If a password isn't set then auth is skipped.
func OptionallyRequireAdminAuth(handler http.HandlerFunc, password string) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
// Empty password means auth is not required.
if password == "" {
handler(w, r)
return
}
username := "uploader"
realm := "Tube uploader"
// The following line is kind of a work around.
// If you want HTTP Basic Auth + Cors it requires _explicit_ origins to be provided in the
// Access-Control-Allow-Origin header. So we just pull out the origin header and specify it.
// If we want to lock down admin APIs to not be CORS accessible for anywhere, this is where we would do that.
w.Header().Set("Access-Control-Allow-Origin", r.Header.Get("Origin"))
w.Header().Set("Access-Control-Allow-Credentials", "true")
w.Header().Set("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, Authorization")
// For request needing CORS, send a 204.
if r.Method == "OPTIONS" {
w.WriteHeader(http.StatusNoContent)
return
}
user, pass, ok := r.BasicAuth()
// Failed
if !ok || subtle.ConstantTimeCompare([]byte(user), []byte(username)) != 1 || subtle.ConstantTimeCompare([]byte(pass), []byte(password)) != 1 {
w.Header().Set("WWW-Authenticate", `Basic realm="`+realm+`"`)
http.Error(w, "Unauthorized", http.StatusUnauthorized)
log.Debugln("Failed uploader authentication")
return
}
handler(w, r)
}
}
func RequireSandstormPermission(handler http.HandlerFunc, permissionNeeded string) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
// Failed
if !strings.Contains(r.Header.Get("X-Sandstorm-Permissions"), permissionNeeded) {
http.Error(w, "Unauthorized", http.StatusUnauthorized)
log.Debugln("No upload capability granted")
return
}
handler(w, r)
}
}
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