1 files changed, 48 insertions, 0 deletions
diff --git a/src/libstore/download.hh b/src/libstore/download.hh
new file mode 100644
index 000000000000..eb2b76678ac7
--- /dev/null
+++ b/src/libstore/download.hh
@@ -0,0 +1,48 @@
+#pragma once
+
+#include "types.hh"
+
+#include <string>
+
+namespace nix {
+
+struct DownloadOptions
+{
+    string expectedETag;
+    bool verifyTLS{true};
+    enum { yes, no, automatic } showProgress{yes};
+    bool head{false};
+};
+
+struct DownloadResult
+{
+    bool cached;
+    string etag;
+    std::shared_ptr<std::string> data;
+};
+
+class Store;
+
+struct Downloader
+{
+    virtual DownloadResult download(string url, const DownloadOptions & options) = 0;
+
+    Path downloadCached(ref<Store> store, const string & url, bool unpack);
+
+    enum Error { NotFound, Forbidden, Misc };
+};
+
+ref<Downloader> makeDownloader();
+
+class DownloadError : public Error
+{
+public:
+    Downloader::Error error;
+    DownloadError(Downloader::Error error, const FormatOrString & fs)
+        : Error(fs), error(error)
+    { }
+};
+
+bool isUri(const string & s);
+
+}