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A route registered as an upload route has its headers run through the middleware first, so a request that isn't allowed is answered before any of its body is taken. The body then goes to a file as it arrives, with a size limit, instead of into memory. MultipartFile splits a multipart/form-data body that is in a file into its parts without loading it. Co-Authored-By: Claude Fable 5.2 <noreply@anthropic.com>
47 lines
1.7 KiB
C++
47 lines
1.7 KiB
C++
#pragma once
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#include <cstdint>
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#include <filesystem>
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#include <optional>
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#include <string>
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#include <string_view>
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#include <vector>
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/**
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* A multipart/form-data body that is in a file (Web's upload routes write large bodies to disk): its parts are split
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* out without ever holding the body in memory. A file part's bytes go to a new file in the folder given, named by
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* its position (never by the name the sender gave it, which is only handed back as text); a field's value is kept
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* as text. No sockets and no settings, so it runs on a worker thread and is unit tested.
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*/
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namespace MultipartFile {
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struct Part {
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std::string name; // the form field's name
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std::string filename; // as sent, unchecked; empty for a field
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bool isFile{};
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std::string value; // a field's value
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std::filesystem::path file; // a file part's bytes
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uint64_t bytes{}; // a file part's size as sent
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bool tooLarge{}; // a file part over maxFileBytes: `file` holds only its start
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};
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struct Limits {
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uint32_t maxParts = 160;
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uint64_t maxFileBytes = 64ULL * 1024 * 1024;
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uint64_t maxFieldBytes = 64 * 1024;
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uint64_t maxHeaderBytes = 8 * 1024;
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};
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enum class eError : uint8_t {
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NONE,
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MALFORMED, // not a multipart body with this boundary, or it ends early
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TOO_MANY_PARTS,
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FIELD_TOO_LARGE,
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IO, // the body couldn't be read or a part couldn't be written
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};
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// The boundary of a "multipart/form-data; boundary=..." content type; nullopt for anything else
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std::optional<std::string> Boundary(std::string_view contentType);
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eError Split(const std::filesystem::path& body, const std::string& boundary, const std::filesystem::path& outDir, const Limits& limits, std::vector<Part>& parts);
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}
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