src/Composer/Util/Svn.php
protected function hasAuth()
    {
        if (null !== $this->hasAuth) {
            return $this->hasAuth;
        }

        if (false === $this->createAuthFromConfig()) {
            $this->createAuthFromUrl();
        }

        return $this->hasAuth;
    }
protected function hasAuth()
    {
        if (null !== $this->hasAuth) {
            return $this->hasAuth;
        }

        if (false === $this->createAuthFromConfig()) {
            $this->createAuthFromUrl();
        }

        return $this->hasAuth;
    }
Detect Svn Auth.

@return bool