S3

[qqpann]

https://qiita.com/ryo0301/items/791c0a666feeea0a704c#バケットポリシー-1

https://www.google.com/search?q=rails+s3&client=safari&rls=en&source=lnt&tbs=cdr%3A1%2Ccd_min%3A11%2F1%2F2018%2Ccd_max%3A&tbm=

https://dev.classmethod.jp/cloud/aws/s3-block-public-access/
https://www.google.com/search?client=safari&rls=en&q=%E3%83%90%E3%82%B1%E3%83%83%E3%83%88%E3%81%AE%E3%83%91%E3%83%96%E3%83%AA%E3%83%83%E3%82%AF%E3%82%A2%E3%82%AF%E3%82%BB%E3%82%B9%E8%A8%AD%E5%AE%9A&ie=UTF-8&oe=UTF-8

https://qiita.com/tonishy/items/9eb772b4a5a338ac6ee6

https://qiita.com/junara/items/1899f23c091bcee3b058#アップロード用のカラムを追加

https://morizyun.github.io/ruby/rails-function-form-carrierwave-fog-s3.html

https://qiita.com/DaichiSaito/items/80e89f0c96d88afcc5ff

[qqpann]

https://stackoverflow.com/questions/10919977/rails-3-create-new-rails-asset-helper-like-image-tag-that-points-to-s3

[qqpann]

cnvs.toDataURL();
VM1809:1 Uncaught DOMException: Failed to execute 'toDataURL' on 'HTMLCanvasElement': Tainted canvases may not be exported.
    at <anonymous>:1:6

https://stackoverflow.com/questions/22710627/tainted-canvases-may-not-be-exported

[qqpann]

CORS有効になてるはずなのにコケるな．．