使用 Faraday 上传文件到 S3

Question

我正在尝试将文件上传到我的 S3 存储桶。下面我用凭据设置了我的请求。我无法推断 headers 和 body 中应该包含什么。秘密访问密钥在签名中。我错过了什么？

  def params
    {
      :key => key_prefix + file_name, 
      :aws_access_key_id => access_key_id,
      :acl => "private",
      :policy => encoded_policy,
      :signature => encoded_signature
    }
  end

  def headers
    {
      "Content-Type" => mime_type,
      "x-amz-security-token" => session_token
    }
  end

  def upload
    connection.post do |req|
      req.headers = headers
      req.body = params.to_json
    end
  end

  def connection
    Faraday.new(:url => bucket_url) do |builder|
      builder.request :multipart
      builder.request :url_encoded
      builder.adapter :typhoeus
    end
  end

我收到的错误是：

<Error><Code>PreconditionFailed</Code><Message>At least one of the pre-conditions you 
specified did not hold</Message><Condition>Bucket POST must be of the enclosure-type 
multipart/form-data</Condition>

Answer 1

好问题！我运行变成了同样的东西。

其中最难的部分是包含文件。这似乎有效：

  def params
    {
      :key => key_prefix + file_name, 
      :aws_access_key_id => access_key_id,
      :acl => "private",
      :policy => encoded_policy,
      :signature => encoded_signature
      :file => Faraday::UploadIO.new(StringIO.new(<<FILECONTENTS>>), <<MIMETYPE>>)
    }
  end

使用 Faraday 上传文件到 S3

Upload file to S3 using Faraday

ruby

file-upload

amazon-s3

amazon-web-services

faraday