Multipart Parser for Lua based on Mashape (Multipart Parser for Lua)

multipart.lua

local function loadFormInput ()
    local result = {
        data = {},
        indexes = {}
    }

    -- Should be set to 4096 or 8192 for real-world settings
    local chunk_size = 4096

    local form, err = upload:new(chunk_size)
    if not form then
        -- There is no form data to read from
        return nil
    end

    form:set_timeout(1000) -- 1 sec

    local part_index = 1
    local part_name, part_value

    while true do
        local typ, res, err = form:read()
        if not typ then
            return nil -- An error happened, 'failed to read'
        end

        if typ == "header" then
            if stringy.startswith(string.lower(res[1]), "content-disposition") then
                local parts = stringy.split(res[3], ";")
                local current_parts = stringy.split(stringy.strip(parts[2]), "=")
                if string.lower(table.remove(current_parts, 1)) == "name" then
                    local current_value = stringy.strip(table.remove(current_parts, 1))
                    part_name = string.sub(current_value, 2, string.len(current_value) - 1)
                end
            end
        elseif typ == "body" then
            part_value = res
        elseif typ == "part_end" then
            if part_name ~= nil then
                result.data[part_index] = {
                    name = part_name,
                    value = part_value
                }

                result.indexes[part_name] = part_index

                -- Reset fields for the next part
                part_value = nil
                part_name = nil
                part_index = part_index + 1
            end
        elseif typ == "eof" then
            -- finish reading the input
            break
        else
            -- do nothing
        end
    end

    return result
end