Support for SimplyPrint cloud integration (#4525)

* Make httpserver more generic and reusable

* Add OAuthJob

* Fix issue caused by the fact that the backing widget of the `TextCtrl` is no longer `wxTextCtrl`

* Implement login and token refresh

* Implement file upload

* Try fix build error

* Support BBL printers

* Show error message if user hasn't done OAuth

* Fix typo

* Update error message

* Disable unsupported options when SimplyPrint is selected

src/slic3r/Utils/SimplyPrint.hpp

@@ -0,0 +1,45 @@
+#ifndef slic3r_SimplyPrint_hpp_
+#define slic3r_SimplyPrint_hpp_
+
+#include "PrintHost.hpp"
+#include "slic3r/GUI/Jobs/OAuthJob.hpp"
+
+namespace Slic3r {
+
+class DynamicPrintConfig;
+class Http;
+class SimplyPrint : public PrintHost
+{
+    std::string cred_file;
+    std::map<std::string, std::string> cred;
+
+    void load_oauth_credential();
+
+    bool do_api_call(std::function<Http(bool /*is_retry*/)>                                                           build_request,
+                     std::function<bool(std::string /* body */, unsigned /* http_status */)>                          on_complete,
+                     std::function<bool(std::string /* body */, std::string /* error */, unsigned /* http_status */)> on_error) const;
+
+public:
+    SimplyPrint(DynamicPrintConfig* config);
+    ~SimplyPrint() override = default;
+
+    const char* get_name() const override { return "SimplyPrint"; }
+    bool can_test() const override { return true; }
+    bool has_auto_discovery() const override { return false; }
+    bool is_cloud() const override { return true; }
+    std::string get_host() const override { return "https://simplyprint.io"; }
+
+    GUI::OAuthParams get_oauth_params() const;
+    void             save_oauth_credential(const GUI::OAuthResult& cred) const;
+
+    wxString                   get_test_ok_msg() const override;
+    wxString                   get_test_failed_msg(wxString& msg) const override;
+    bool                       test(wxString& curl_msg) const override;
+    PrintHostPostUploadActions get_post_upload_actions() const override { return PrintHostPostUploadAction::QueuePrint; }
+    bool                       upload(PrintHostUpload upload_data, ProgressFn prorgess_fn, ErrorFn error_fn, InfoFn info_fn) const override;
+    bool                       is_logged_in() const override { return !cred.empty(); }
+    void                       log_out() const override;
+};
+} // namespace Slic3r
+
+#endif