re-write download code to support headers, needed for etag support.

etag support will be added later. github supports it and themezer probably does as well.
appstore does not sadly...

sphaira/include/download.hpp

@@ -1,41 +1,159 @@
 #pragma once
 
+#include "fs.hpp"
 #include <vector>
 #include <string>
 #include <functional>
+#include <unordered_map>
+#include <type_traits>
 #include <switch.h>
 
-namespace sphaira {
+namespace sphaira::curl {
 
-using DownloadCallback = std::function<void(std::vector<u8>& data, bool success)>;
-using ProgressCallback = std::function<bool(u32 dltotal, u32 dlnow, u32 ultotal, u32 ulnow)>;
-
-enum class DownloadPriority {
+enum class Priority {
     Normal, // gets pushed to the back of the queue
     High, // gets pushed to the front of the queue
 };
 
+using Path = fs::FsPath;
+using Header = std::unordered_map<std::string, std::string>;
+using OnComplete = std::function<void(std::vector<u8>& data, bool success, long code)>;
+using OnProgress = std::function<bool(u32 dltotal, u32 dlnow, u32 ultotal, u32 ulnow)>;
+
+struct Url {
+    Url() = default;
+    Url(const std::string& str) : m_str{str} {}
+    std::string m_str;
+};
+
+struct Fields {
+    Fields() = default;
+    Fields(const std::string& str) : m_str{str} {}
+    std::string m_str;
+};
+
+struct Api;
+
 struct DownloadEventData {
-    DownloadCallback callback;
+    OnComplete callback;
     std::vector<u8> data;
+    long code;
     bool result;
 };
 
-auto DownloadInit() -> bool;
-void DownloadExit();
+auto Init() -> bool;
+void Exit();
 
 // sync functions
-auto DownloadMemory(const std::string& url, const std::string& post, ProgressCallback pcallback = nullptr) -> std::vector<u8>;
-auto DownloadFile(const std::string& url, const std::string& out, const std::string& post, ProgressCallback pcallback = nullptr) -> bool;
+auto ToMemory(const Api& e) -> std::vector<u8>;
+auto ToFile(const Api& e) -> bool;
+
 // async functions
-// starts the downloads in a new thread, pushes an event when complete
-// then, the callback will be called on the main thread.
-// auto DownloadMemoryAsync(const std::string& url, DownloadCallback callback, DownloadPriority prio = DownloadPriority::Normal) -> bool;
-// auto DownloadFileAsync(const std::string& url, const std::string& out, DownloadCallback callback, DownloadPriority prio = DownloadPriority::Normal) -> bool;
+auto ToMemoryAsync(const Api& e) -> bool;
+auto ToFileAsync(const Api& e) -> bool;
 
-auto DownloadMemoryAsync(const std::string& url, const std::string& post, DownloadCallback callback, ProgressCallback pcallback = nullptr, DownloadPriority prio = DownloadPriority::Normal) -> bool;
-auto DownloadFileAsync(const std::string& url, const std::string& out, const std::string& post, DownloadCallback callback, ProgressCallback pcallback = nullptr, DownloadPriority prio = DownloadPriority::Normal) -> bool;
+// removes url from cache (todo: deprecate this)
+void ClearCache(const Url& url);
 
-void DownloadClearCache(const std::string& url);
+struct Api {
+    Api() = default;
 
-} // namespace sphaira
+    template <typename... Ts>
+    Api(Ts&&... ts) {
+        Api::set_option(std::forward<Ts>(ts)...);
+    }
+
+    template <typename... Ts>
+    auto To(Ts&&... ts) {
+        if constexpr(std::disjunction_v<std::is_same<Path, Ts>...>) {
+            return ToFile(std::forward<Ts>(ts)...);
+        } else {
+            return ToMemory(std::forward<Ts>(ts)...);
+        }
+    }
+
+    template <typename... Ts>
+    auto ToAsync(Ts&&... ts) {
+        if constexpr(std::disjunction_v<std::is_same<Path, Ts>...>) {
+            return ToFileAsync(std::forward<Ts>(ts)...);
+        } else {
+            return ToMemoryAsync(std::forward<Ts>(ts)...);
+        }
+    }
+
+    template <typename... Ts>
+    auto ToMemory(Ts&&... ts) {
+        static_assert(std::disjunction_v<std::is_same<Url, Ts>...>, "Url must be specified");
+        Api::set_option(std::forward<Ts>(ts)...);
+        return curl::ToMemory(*this);
+    }
+
+    template <typename... Ts>
+    auto ToFile(Ts&&... ts) {
+        static_assert(std::disjunction_v<std::is_same<Url, Ts>...>, "Url must be specified");
+        static_assert(std::disjunction_v<std::is_same<Path, Ts>...>, "Path must be specified");
+        Api::set_option(std::forward<Ts>(ts)...);
+        return curl::ToFile(*this);
+    }
+
+    template <typename... Ts>
+    auto ToMemoryAsync(Ts&&... ts) {
+        static_assert(std::disjunction_v<std::is_same<Url, Ts>...>, "Url must be specified");
+        static_assert(std::disjunction_v<std::is_same<OnComplete, Ts>...>, "OnComplete must be specified");
+        Api::set_option(std::forward<Ts>(ts)...);
+        return curl::ToMemoryAsync(*this);
+    }
+
+    template <typename... Ts>
+    auto ToFileAsync(Ts&&... ts) {
+        static_assert(std::disjunction_v<std::is_same<Url, Ts>...>, "Url must be specified");
+        static_assert(std::disjunction_v<std::is_same<Path, Ts>...>, "Path must be specified");
+        static_assert(std::disjunction_v<std::is_same<OnComplete, Ts>...>, "OnComplete must be specified");
+        Api::set_option(std::forward<Ts>(ts)...);
+        return curl::ToFileAsync(*this);
+    }
+
+    Url m_url;
+    Fields m_fields{};
+    Header m_header{};
+    Path m_path{};
+    OnComplete m_on_complete = nullptr;
+    OnProgress m_on_progress = nullptr;
+    Priority m_prio = Priority::Normal;
+
+private:
+    void SetOption(Url&& v) {
+        m_url = v;
+    }
+    void SetOption(Fields&& v) {
+        m_fields = v;
+    }
+    void SetOption(Header&& v) {
+        m_header = v;
+    }
+    void SetOption(Path&& v) {
+        m_path = v;
+    }
+    void SetOption(OnComplete&& v) {
+        m_on_complete = v;
+    }
+    void SetOption(OnProgress&& v) {
+        m_on_progress = v;
+    }
+    void SetOption(Priority&& v) {
+        m_prio = v;
+    }
+
+    template <typename T>
+    void set_option(T&& t) {
+        SetOption(std::forward<T>(t));
+    }
+
+    template <typename T, typename... Ts>
+    void set_option(T&& t, Ts&&... ts) {
+        set_option(std::forward<T>(t));
+        set_option(std::forward<Ts>(ts)...);
+    }
+};
+
+} // namespace sphaira::curl