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path: root/app/controllers/downloads_controller.rb
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require 'aws-sdk-core/s3'
require 'fileutils'

class DownloadsController < ApplicationController
  before_action :set_download, only: [:show, :edit, :update, :destroy]

  # GET /downloads
  # GET /downloads.json
  def index
    @downloads = Download.all
  end

  # GET /downloads/:filename
  def download
    download = Download.find_by(filename: params[:filename]) or not_found

    s3client = Aws::S3::Client.new()
    s3obj = Aws::S3::Object.new(ENV['S3_DOWNLOADS_BUCKET'], download.filename, client: s3client)
    resp = s3obj.get

    FileUtils.mkdir_p(Rails.root.join('tmp', 'downloads'))

    cached_filename = Rails.root.join('tmp', 'downloads', download.filename)

    File.open(cached_filename, 'wb') do |file|
      file.write resp.body.read
    end

    send_file cached_filename
  end

  # GET /downloads/1
  # GET /downloads/1.json
  def show
  end

  # GET /downloads/new
  def new
    @download = Download.new
  end

  # GET /downloads/1/edit
  def edit
  end

  # POST /downloads
  # POST /downloads.json
  def create
    @download = Download.new(download_params)

    respond_to do |format|
      if @download.save
        format.html { redirect_to @download, notice: 'Download was successfully created.' }
        format.json { render :show, status: :created, location: @download }
      else
        format.html { render :new }
        format.json { render json: @download.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /downloads/1
  # PATCH/PUT /downloads/1.json
  def update
    respond_to do |format|
      if @download.update(download_params)
        format.html { redirect_to @download, notice: 'Download was successfully updated.' }
        format.json { render :show, status: :ok, location: @download }
      else
        format.html { render :edit }
        format.json { render json: @download.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /downloads/1
  # DELETE /downloads/1.json
  def destroy
    @download.destroy
    respond_to do |format|
      format.html { redirect_to downloads_url, notice: 'Download was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

  private
    # Use callbacks to share common setup or constraints between actions.
    def set_download
      @download = Download.find(params[:id])
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def download_params
      params.require(:download).permit(:name, :filename, :type, :description, :hits)
    end
end