This gem adds support for Aliyun OSS to CarrierWave
NOTE: 此 Gem 是一个 CarrierWave 的组件，你需要配合 CarrierWave 一起使用，如果你需要直接用 Aliyun OSS，可以尝试用 aliyun-sdk 这个 Gem。
NOTE: This gem is a extends for CarrierWave for allow it support use Alicloud OSS as storage backend, if you wants use Alicloud OSS directly, please visit aliyun-sdk.
gem 'carrierwave-aliyun'You need a config/initializers/carrierwave.rb for initialize, and update your configurations:
CarrierWave.configure do |config|
config.storage = :aliyun
config.aliyun_access_key_id = "xxxxxx"
config.aliyun_access_key_secret = 'xxxxxx'
# 你需要在 Aliyun OSS 上面提前创建一个 Bucket
# You must create a Bucket on Alicloud OSS first.
config.aliyun_bucket = "simple"
# 是否使用内部连接，true - 使用 Aliyun 主机内部局域网的方式访问 false - 外部网络访问
# When your app server wants deployment in Alicloud internal network, enable this option can speed up uploading by using internal networking. otherwice you must disable it.
config.aliyun_internal = true
# 配置存储的地区数据中心，默认: "cn-hangzhou"
# Which region of your Bucket.
# config.aliyun_region = "cn-hangzhou"
# 使用自定义域名，设定此项，carrierwave 返回的 URL 将会用自定义域名
# 自定义域名请 CNAME 到 you_bucket_name.oss-cn-hangzhou.aliyuncs.com (you_bucket_name 是你的 bucket 的名称)
# aliyun_host allow you config a custom host for your Alicloud Bucket, and you also need config that on Alicloud.
config.aliyun_host = "https://foo.bar.com"
# Bucket 为私有读取请设置 true，默认 false，以便得到的 URL 是能带有 private 空间访问权限的逻辑
# Tell SDK the privacy of you Bucket, if private CarrierWave xxx.url will generate URL with a expires parameter, default: :public.
# config.aliyun_mode = :private
endNOTE: 此方法同样支持 Private 的 Bucket 哦！
NOTE: Private Bucket also support this feature!
关于阿里云 OSS 图片缩略图的详细文档，请仔细阅读：Aliyun OSS 接入图片服务
The details of the Alicoud OSS image thumb service, please visit Alicloud OSS - Image Processing / Resize images
irb> User.last.avatar.url(thumb: '?x-oss-process=image/resize,h_100')
"https://simple.oss-cn-hangzhou.aliyuncs.com/users/avatar/12.png?x-oss-process=image/resize,h_100"
irb> User.last.avatar.url(thumb: '?x-oss-process=image/resize,h_100,w_100')
"https://simple.oss-cn-hangzhou.aliyuncs.com/users/avatar/12.png?x-oss-process=image/resize,h_100,w_100"在文件上传的场景（非图片），你可能需要给上传的文件设置 Content-Disposition 以便于用户直接访问 URL 的时候能够用你期望的文件名或原文件名来下载并保存。
In some case, you may need change the Content-Disposition for your uploaded files for allow users visit URL with direct download, and get the original filename.
这个时候你需要给 Uploader 实现 content_disposition 函数，例如：
So, you need implement a content_disposition method for your CarrierWave Uploader, for example:
# app/uploaders/attachment_uploader.rb
class AttachmentUploader < CarrierWave::Uploader::Base
def content_disposition
# Only for non-image files
unless file.extension.downcase.in?(%w(jpg jpeg gif png svg))
"attachment;filename=#{file.original_filename}"
end
end
end阿里云允许我们通过 oss-accelerate.aliyuncs.com 的节点来实现全球的传输加速，如果你的需要在境外的服务器传输到国内，或许需要开启这个功能。
你只需要将 CarrierWave Aliyun 的 aliyun_region 配置为 accelerate 即可。
config.aliyun_region = "accelerate"错误：OSS Transfer Acceleration is not configured on this bucket. 确保有开启 传输加速，进入 Bucket / 传输管理 / 传输加速 / 开启传输加速。
额外注意：Aliyun OSS 开启传输加速后需要 30 分钟内全网生效
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