{"id":22582,"date":"2025-11-06T21:53:12","date_gmt":"2025-11-06T21:53:12","guid":{"rendered":"https:\/\/pokecon.jp\/job\/?p=22582"},"modified":"2025-11-06T21:53:12","modified_gmt":"2025-11-06T21:53:12","slug":"aws-s3-%e7%bd%b2%e5%90%8d%e4%bb%98%e3%81%8d%e3%82%a2%e3%83%83%e3%83%97%e3%83%ad%e3%83%bc%e3%83%89%e6%a9%9f%e8%83%bd-presigned-url%e3%81%a8post-policy%e3%81%ae%e6%af%94%e8%bc%83","status":"publish","type":"post","link":"https:\/\/pokecon.jp\/job\/22582\/","title":{"rendered":"AWS S3 \u7f72\u540d\u4ed8\u304d\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u6a5f\u80fd Presigned URL\u3068POST Policy\u306e\u6bd4\u8f03"},"content":{"rendered":"\n
<\/p>\n
\n

\u3053\u3093\u306b\u3061\u306f\u3001\u30a6\u30a9\u30f3\u30c6\u30c3\u30c9\u30ea\u30fc\u3067\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u30a8\u30f3\u30b8\u30cb\u30a2\u3092\u3057\u3066\u3044\u308b\u5e73\u5ca1\u3067\u3059 \u3002<\/span><\/p>\n

\u30b5\u30fc\u30d0\u30fc\u3092\u7d4c\u7531\u305b\u305a\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u304b\u3089S3\u3078\u76f4\u63a5\u30d5\u30a1\u30a4\u30eb\u3092\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3059\u308b\u6280\u8853\u306f\u3001\u3088\u308a\u826f\u3044\u30e6\u30fc\u30b6\u4f53\u9a13\u3092\u4f5c\u308b\u305f\u3081\u306e\u9078\u629e\u80a2\u3068\u3057\u3066\u6628\u4eca\u306eWeb\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u958b\u767a\u3067\u306f\u6b20\u304b\u305b\u306a\u3044\u3082\u306e\u3068\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/span><\/p>\n

\u672c\u8a18\u4e8b\u3067\u306f\u3001\u305d\u308c\u3089\u3092\u5b9f\u73fe\u3059\u308b\u6280\u8853\u3068\u3057\u3066\u3001AWS S3\u306ePresigned URL\u3068POST Policy\u306b\u3064\u3044\u3066\u8abf\u3079\u305f\u3053\u3068\u3092\u307e\u3068\u3081\u3066\u307f\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/span><\/p>\n

Presigned URL <\/strong><\/h2>\n

Presigned URL\u306f\u3001S3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5bfe\u3059\u308b<\/span>\u4e00\u6642\u7684\u306a\u30a2\u30af\u30bb\u30b9\u6a29\u9650\u4ed8\u304d\u306eURL<\/strong>\u3092\u767a\u884c\u3059\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002<\/span><\/p>\n

    \n
  1. \u30b5\u30fc\u30d0\u30fc\u5074\u306e\u5f79\u5272\uff1a<\/span>
    AWS SDK\uff08\u4f8b\uff1aPython\u306eboto3\u3084Node.js\u306eAWS SDK\uff09\u3092\u4f7f\u7528\u3057\u3001\u6709\u52b9\u671f\u9650\u4ed8\u304d\u306ePUT\u30ea\u30af\u30a8\u30b9\u30c8\u7528URL\u3092\u751f\u6210\u3057\u307e\u3059\u3002<\/span><\/li>\n<\/ol>\n
    url <\/span>=<\/span> s3_client<\/span>.<\/span>generate_presigned_url<\/span>(<\/span>\u00a0\u00a0\u00a0\u00a0ClientMethod<\/span>=<\/span>'put_object'<\/span>,<\/span>\u00a0<\/span>\u00a0\u00a0\u00a0\u00a0Params<\/span>=<\/span>{<\/span>'Bucket'<\/span>:<\/span> <\/span>'your-bucket-name'<\/span>,<\/span> <\/span>'Key'<\/span>:<\/span> <\/span>'path\/to\/file.txt'<\/span>}<\/span>,<\/span>\u00a0\u00a0\u00a0\u00a0ExpiresIn<\/span>=<\/span>3600<\/span> <\/span>)<\/span><\/code><\/pre>\n
      \n
    1. \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u5074\u306e\u5f79\u5272\uff1a<\/span>
      \u30b5\u30fc\u30d0\u30fc\u304b\u3089\u53d7\u3051\u53d6\u3063\u305fURL\u306b\u5bfe\u3057\u3066\u3001\u30d5\u30a1\u30a4\u30eb\u3092\u76f4\u63a5PUT\u30ea\u30af\u30a8\u30b9\u30c8\u3067\u9001\u4fe1\u3057\u307e\u3059\u3002\u8a8d\u8a3c\u60c5\u5831\u306fURL\u306b\u542b\u307e\u308c\u3066\u3044\u308b\u305f\u3081\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u5074\u3067\u5225\u9014\u8a8d\u8a3c\u30d8\u30c3\u30c0\u30fc\u3092\u7528\u610f\u3059\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/span><\/li>\n<\/ol>\n
      const<\/span> file <\/span>=<\/span> document<\/span>.<\/span>getElementById<\/span>(<\/span>'file-input'<\/span>)<\/span>.<\/span>files<\/span>[<\/span>0<\/span>]<\/span>;<\/span>fetch<\/span>(<\/span>presignedUrl<\/span>,<\/span> <\/span>{<\/span>\u00a0\u00a0\u00a0\u00a0method<\/span>:<\/span> <\/span>'PUT'<\/span>,<\/span>\u00a0\u00a0\u00a0\u00a0body<\/span>:<\/span> file<\/span>,<\/span>\u00a0\u00a0\u00a0\u00a0headers<\/span>:<\/span> <\/span>{<\/span> <\/span>'Content-Type'<\/span>:<\/span> file<\/span>.<\/span>type <\/span>}<\/span>}<\/span>)<\/span><\/code><\/pre>\n
      POST Policy <\/strong><\/h2>\n
      POST Policy\u306f\u3001\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3092\u8a31\u53ef\u3059\u308b<\/span>\u6761\u4ef6\uff08Policy Document\uff09\u3068\u7f72\u540d<\/strong>\u3092\u751f\u6210\u3057\u3001\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306b\u6e21\u3057\u307e\u3059\u3002\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306f\u3053\u306e\u60c5\u5831\u3092\u4f7f\u3063\u3066S3\u306e\u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8\u3078HTML\u30d5\u30a9\u30fc\u30e0\u3092\u9001\u4fe1\u3057\u307e\u3059\u3002<\/span><\/p>\n
        \n
      1. \u30b5\u30fc\u30d0\u30fc\u5074\u306e\u5f79\u5272\uff1a<\/span>
        \u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u306e\u30d5\u30a1\u30a4\u30eb\u30b5\u30a4\u30ba\u3001\u30d5\u30a1\u30a4\u30eb\u540d\uff08\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\uff09\u3001\u6709\u52b9\u671f\u9650\u306a\u3069\u306e\u6761\u4ef6\u3092\u5b9a\u7fa9\u3057\u305f\u30dd\u30ea\u30b7\u30fc\u3092\u751f\u6210\u3057\u3001\u305d\u306e\u30dd\u30ea\u30b7\u30fc\u306b\u5bfe\u3057\u3066\u7f72\u540d\u3092\u884c\u3044\u307e\u3059\u3002<\/span><\/li>\n<\/ol>\n
        require<\/span> <\/span>'openssl'<\/span>require<\/span> <\/span>'time'<\/span>
        AWS_ACCESS_KEY_ID<\/span>     <\/span>=<\/span> <\/span>'AKIAIOSFODNN7EXAMPLE'<\/span> <\/span>AWS_SECRET_ACCESS_KEY<\/span> <\/span>=<\/span> <\/span>'wJalrXUtnFEMI\/K7MDENG\/bPxRfiCYEXAMPLEKEY'<\/span> <\/span>AWS_REGION<\/span>            <\/span>=<\/span> <\/span>'ap-northeast-1'<\/span>BUCKET_NAME<\/span>           <\/span>=<\/span> <\/span>'your-bucket-name'<\/span>KEY_PREFIX<\/span>            <\/span>=<\/span> <\/span>'uploads\/'<\/span>EXPIRATION_TIME<\/span>       <\/span>=<\/span> <\/span>(<\/span>Time<\/span>.<\/span>now<\/span>.<\/span>utc <\/span>+<\/span> <\/span>3600<\/span>)<\/span>.<\/span>iso8601<\/span>.<\/span>gsub<\/span>(<\/span>\/\\.\\d+Z\/<\/span>,<\/span> <\/span>'Z'<\/span>)<\/span> <\/span><\/p>
        policy_document <\/span>=<\/span> <\/span>{<\/span>  <\/span>'expiration'<\/span> <\/span>=><\/span> <\/span>EXPIRATION_TIME<\/span>,<\/span>  <\/span>'conditions'<\/span> <\/span>=><\/span> <\/span>[<\/span>    <\/span>{<\/span>'bucket'<\/span> <\/span>=><\/span> <\/span>BUCKET_NAME<\/span>}<\/span>,<\/span>    <\/span>[<\/span>'starts-with'<\/span>,<\/span> <\/span>'$key'<\/span>,<\/span> <\/span>KEY_PREFIX<\/span>]<\/span>,<\/span>    <\/span>{<\/span>'acl'<\/span> <\/span>=><\/span> <\/span>'public-read'<\/span>}<\/span>,<\/span> <\/span>    <\/span>{<\/span>'success_action_status'<\/span> <\/span>=><\/span> <\/span>'201'<\/span>}<\/span>,<\/span> <\/span>    <\/span>{<\/span>'x-amz-credential'<\/span> <\/span>=><\/span> <\/span>\"<\/span>#{<\/span>AWS_ACCESS_KEY_ID<\/span>}<\/span>\/<\/span>#{<\/span>Date<\/span>.<\/span>today<\/span>.<\/span>strftime<\/span>(<\/span>'%Y%m%d'<\/span>)<\/span>}<\/span>\/<\/span>#{<\/span>AWS_REGION<\/span>}<\/span>\/s3\/aws4_request\"<\/span>}<\/span>,<\/span>    <\/span>{<\/span>'x-amz-algorithm'<\/span> <\/span>=><\/span> <\/span>'AWS4-HMAC-SHA256'<\/span>}<\/span>,<\/span>    <\/span>{<\/span>'x-amz-date'<\/span> <\/span>=><\/span> <\/span>Time<\/span>.<\/span>now<\/span>.<\/span>utc<\/span>.<\/span>strftime<\/span>(<\/span>'%Y%m%dT%H%M%SZ'<\/span>)<\/span>}<\/span>  <\/span>]<\/span>}<\/span><\/p>
        policy_json <\/span>=<\/span> policy_document<\/span>.<\/span>to_json<\/span>base64_policy <\/span>=<\/span> Base64<\/span>.<\/span>strict_encode64<\/span>(<\/span>policy_json<\/span>)<\/span>puts <\/span>\"Base64 Policy: <\/span>#{<\/span>base64_policy<\/span>}<\/span>\"<\/span><\/p>
        def<\/span> <\/span>get_signature_key<\/span>(<\/span>key<\/span>,<\/span> date_stamp<\/span>,<\/span> region_name<\/span>,<\/span> service_name<\/span>)<\/span>  k_date    <\/span>=<\/span> OpenSSL<\/span>::<\/span>HMAC<\/span>.<\/span>digest<\/span>(<\/span>'sha256'<\/span>,<\/span> <\/span>\"AWS4<\/span>#{<\/span>key<\/span>}<\/span>\"<\/span>,<\/span> date_stamp<\/span>)<\/span>  k_region  <\/span>=<\/span> OpenSSL<\/span>::<\/span>HMAC<\/span>.<\/span>digest<\/span>(<\/span>'sha256'<\/span>,<\/span> k_date<\/span>,<\/span> region_name<\/span>)<\/span>  k_service <\/span>=<\/span> OpenSSL<\/span>::<\/span>HMAC<\/span>.<\/span>digest<\/span>(<\/span>'sha256'<\/span>,<\/span> k_region<\/span>,<\/span> service_name<\/span>)<\/span>  k_signing <\/span>=<\/span> OpenSSL<\/span>::<\/span>HMAC<\/span>.<\/span>digest<\/span>(<\/span>'sha256'<\/span>,<\/span> k_service<\/span>,<\/span> <\/span>'aws4_request'<\/span>)<\/span>  k_signing<\/span>end<\/span><\/p>
        date_stamp <\/span>=<\/span> Date<\/span>.<\/span>today<\/span>.<\/span>strftime<\/span>(<\/span>'%Y%m%d'<\/span>)<\/span>signature_key <\/span>=<\/span> get_signature_key<\/span>(<\/span>AWS_SECRET_ACCESS_KEY<\/span>,<\/span> date_stamp<\/span>,<\/span> <\/span>AWS_REGION<\/span>,<\/span> <\/span>'s3'<\/span>)<\/span><\/p>
        signature <\/span>=<\/span> OpenSSL<\/span>::<\/span>HMAC<\/span>.<\/span>hexdigest<\/span>(<\/span>'sha256'<\/span>,<\/span> signature_key<\/span>,<\/span> base64_policy<\/span>)<\/span><\/p>
        puts <\/span>\"---\"<\/span>puts <\/span>\"AWS Access Key ID: <\/span>#{<\/span>AWS_ACCESS_KEY_ID<\/span>}<\/span>\"<\/span>puts <\/span>\"x-amz-credential:  <\/span>#{<\/span>AWS_ACCESS_KEY_ID<\/span>}<\/span>\/<\/span>#{<\/span>date_stamp<\/span>}<\/span>\/<\/span>#{<\/span>AWS_REGION<\/span>}<\/span>\/s3\/aws4_request\"<\/span>puts <\/span>\"x-amz-date:        <\/span>#{<\/span>Time<\/span>.<\/span>now<\/span>.<\/span>utc<\/span>.<\/span>strftime<\/span>(<\/span>'%Y%m%dT%H%M%SZ'<\/span>)<\/span>}<\/span>\"<\/span>puts <\/span>\"Policy (Base64):   <\/span>#{<\/span>base64_policy<\/span>}<\/span>\"<\/span>puts <\/span>\"**Signature (x-amz-signature):** <\/span>#{<\/span>signature<\/span>}<\/span>\"<\/span><\/p><\/code><\/pre>\n
          \n
        1. \u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u5074\u306e\u5f79\u5272\uff1a<\/span>
          S3\u306e\u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8\u3092action\u306b\u6307\u5b9a\u3057\u305fHTML\u30d5\u30a9\u30fc\u30e0\u3092\u4f5c\u6210\u3057\u3001\u30b5\u30fc\u30d0\u30fc\u304b\u3089\u53d7\u3051\u53d6\u3063\u305f\u30dd\u30ea\u30b7\u30fc\u60c5\u5831\u3084\u7f72\u540d\u3092hidden\u30d5\u30a3\u30fc\u30eb\u30c9\u3068\u3057\u3066\u57cb\u3081\u8fbc\u307f\u307e\u3059\u3002\u30e6\u30fc\u30b6\u30fc\u304c\u30d5\u30a1\u30a4\u30eb\u3092\u9078\u629e\u3057\u30d5\u30a9\u30fc\u30e0\u3092\u9001\u4fe1\u3059\u308b\u3068\u3001S3\u306b\u76f4\u63a5POST\u30ea\u30af\u30a8\u30b9\u30c8\u304c\u9001\u3089\u308c\u307e\u3059\u3002<\/span><\/li>\n<\/ol>\n
          form<\/span> <\/span>action<\/span>=<\/span>\"<\/span>https:\/\/.s3.amazonaws.com\/<\/span>\"<\/span> <\/span>method<\/span>=<\/span>\"<\/span>POST<\/span>\"<\/span> <\/span>enctype<\/span>=<\/span>\"<\/span>multipart\/form-data<\/span>\"<\/span>><\/span>  <\/span>input<\/span> <\/span>type<\/span>=<\/span>\"<\/span>hidden<\/span>\"<\/span> <\/span>name<\/span>=<\/span>\"<\/span>key<\/span>\"<\/span> <\/span>value<\/span>=<\/span>\"<\/span>${filename}<\/span>\"<\/span> <\/span>\/><\/span>  <\/span>input<\/span> <\/span>type<\/span>=<\/span>\"<\/span>hidden<\/span>\"<\/span> <\/span>name<\/span>=<\/span>\"<\/span>policy<\/span>\"<\/span> <\/span>value<\/span>=<\/span>\"<\/span>\"<\/span> <\/span>\/><\/span>  <\/span>input<\/span> <\/span>type<\/span>=<\/span>\"<\/span>hidden<\/span>\"<\/span> <\/span>name<\/span>=<\/span>\"<\/span>x-amz-signature<\/span>\"<\/span> <\/span>value<\/span>=<\/span>\"<\/span>\"<\/span> <\/span>\/><\/span>
            <\/span>input<\/span> <\/span>type<\/span>=<\/span>\"<\/span>hidden<\/span>\"<\/span> <\/span>name<\/span>=<\/span>\"<\/span>x-amz-credential<\/span>\"<\/span> <\/span>value<\/span>=<\/span>\"<\/span>\/\/\/s3\/aws4_request<\/span>\"<\/span> <\/span>\/><\/span>  <\/span>input<\/span> <\/span>type<\/span>=<\/span>\"<\/span>hidden<\/span>\"<\/span> <\/span>name<\/span>=<\/span>\"<\/span>x-amz-algorithm<\/span>\"<\/span> <\/span>value<\/span>=<\/span>\"<\/span>AWS4-HMAC-SHA256<\/span>\"<\/span> <\/span>\/><\/span>  <\/span>input<\/span> <\/span>type<\/span>=<\/span>\"<\/span>hidden<\/span>\"<\/span> <\/span>name<\/span>=<\/span>\"<\/span>x-amz-date<\/span>\"<\/span> <\/span>value<\/span>=<\/span>\"<\/span>\"<\/span> <\/span>\/><\/span>  <\/span>  <\/span>input<\/span> <\/span>type<\/span>=<\/span>\"<\/span>hidden<\/span>\"<\/span> <\/span>name<\/span>=<\/span>\"<\/span>acl<\/span>\"<\/span> <\/span>value<\/span>=<\/span>\"<\/span>public-read<\/span>\"<\/span> <\/span>\/><\/span>  <\/span>input<\/span> <\/span>type<\/span>=<\/span>\"<\/span>hidden<\/span>\"<\/span> <\/span>name<\/span>=<\/span>\"<\/span>success_action_status<\/span>\"<\/span> <\/span>value<\/span>=<\/span>\"<\/span>201<\/span>\"<\/span> <\/span>\/><\/span><\/span><\/span><\/span><\/span><\/span><\/p>
            <\/span>input<\/span> <\/span>type<\/span>=<\/span>\"<\/span>file<\/span>\"<\/span> <\/span>name<\/span>=<\/span>\"<\/span>file<\/span>\"<\/span> <\/span>\/><\/span>  <\/span>input<\/span> <\/span>type<\/span>=<\/span>\"<\/span>submit<\/span>\"<\/span> <\/span>value<\/span>=<\/span>\"<\/span>Upload to S3<\/span>\"<\/span> <\/span>\/><\/span>form<\/span>><\/span><\/span><\/span><\/p><\/span><\/span><\/span><\/span><\/code><\/pre>\n
          CORS\u5236\u7d04\uff08Cross-Origin Resource Sharing\uff09<\/strong><\/h2>\n
          Presigned URL\u306f\u3001\u524d\u8ff0\u306e\u901a\u308aJavaScript\u306efetch\u3084XMLHttpRequest\u3068\u3044\u3063\u305f<\/span>\u30b9\u30af\u30ea\u30d7\u30c8\u901a\u4fe1<\/strong>\uff08PUT\u30ea\u30af\u30a8\u30b9\u30c8\uff09\u3068\u3057\u3066S3\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u4ed5\u7d44\u307f\u3067\u3059\u3002JavaScript\u3067S3\uff08\u7570\u306a\u308b\u30aa\u30ea\u30b8\u30f3\uff09\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u305f\u3081\u3001CORS\uff08Cross-Origin Resource Sharing\uff09\u306e\u8a2d\u5b9a\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\u3002<\/span><\/p>\n
          \u4e00\u65b9POST Policy \u306b\u95a2\u3057\u3066\u306f\u3001\u57fa\u672c\u7684\u306b\u7d14\u7c8b\u306aHTML\u30d5\u30a9\u30fc\u30e0\u9001\u4fe1\u3068\u3057\u3066\u4f7f\u3046\u9650\u308a\u306f\u3001CORS\u306e\u8a2d\u5b9a\u3092\u884c\u3046\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002<\/span><\/p>\n
          \u307e\u3068\u3081<\/strong><\/h2>\n
          \u3044\u304b\u304c\u3067\u3057\u305f\u3067\u3057\u3087\u3046\u304b\uff1f\u540c\u3058\u30d5\u30a1\u30a4\u30eb\u30a2\u30c3\u30d7\u30ed\u30fc\u30c9\u3092\u5b9f\u73fe\u3059\u308b\u6280\u8853\u3067\u3042\u308a\u306a\u304c\u3089\u3001Presigned URL\u306fJavaScript\u3067\u306e\u30a2\u30af\u30bb\u30b9\u3092\u524d\u63d0\u306b\u30ea\u30af\u30a8\u30b9\u30c8\u3059\u308b\u4ed5\u7d44\u307f\u3067\u3042\u308a\u3001\u4e00\u65b9Post Policy\u306f\u3001HTML\u306eform\u3092\u524d\u63d0\u306b\u30ea\u30af\u30a8\u30b9\u30c8\u3059\u308b\u4ed5\u7d44\u307f\u3068\u3044\u3046\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002<\/span><\/p>\n
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