FHttpMultipartFormData.h

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// Copyright (c) 2025 Doppleddiggong. All rights reserved. Unauthorized copying, modification, or distribution of this file, via any medium is strictly prohibited. Proprietary and confidential.
 
#pragma once
 
#include "CoreMinimal.h"
#include "Interfaces/IHttpRequest.h"
 
enum class EFormDataType : uint8
{
    Multipart,
    MultipartArray,
    FormUrlEncoded
};
 
class FHttpMultipartFormData
{
public:
    FHttpMultipartFormData(EFormDataType Type = EFormDataType::Multipart);
 
    void AddText(const FString& FieldName, const FString& Value);
 
    FORCEINLINE void AddStringField(const FString& FieldName, const FString& Value)
    {
        AddText(FieldName, Value);
    }
 
    bool AddFile(const FString& FieldName, const FString& FilePath, const FString& MimeType = TEXT(""));
 
    void Reset();
 
    void SetupHttpRequest(const TSharedRef<IHttpRequest, ESPMode::ThreadSafe>& Request);
 
    const FString& GetBoundary() const { return Boundary; }
 
    const TArray<uint8>& GetBuiltBody() const { return BuiltBody; }
 
private:
    struct FTextPart
    {
        FString Name;
        FString Value;
    };
 
    struct FFilePart
    {
        FString Name;
        FString FileName;
        FString MimeType;
        TArray<uint8> Data;
    };
 
private:
    static FString DetectMimeFromExtension(const FString& FileName);
 
    static void AppendUtf8(TArray<uint8>& Dest, const FString& Str);
 
    void BuildBody();
 
private:
    EFormDataType FormDataType;
    FString Boundary;
    TArray<FTextPart> TextParts;
    TArray<FFilePart> FileParts;
    TArray<uint8> BuiltBody;
};