Merge branch 'master' of github.com:basecamp/activefile

Gemfile

@@ -4,4 +4,6 @@ gemspec
 
 gem 'rake'
 gem 'byebug'
-gem 'sqlite3'
\ No newline at end of file
+
+gem 'sqlite3'
+gem 'aws-sdk'
\ No newline at end of file

Gemfile.lock

@@ -24,11 +24,20 @@ GEM
       minitest (~> 5.1)
       tzinfo (~> 1.1)
     arel (8.0.0)
+    aws-sdk (2.10.7)
+      aws-sdk-resources (= 2.10.7)
+    aws-sdk-core (2.10.7)
+      aws-sigv4 (~> 1.0)
+      jmespath (~> 1.0)
+    aws-sdk-resources (2.10.7)
+      aws-sdk-core (= 2.10.7)
+    aws-sigv4 (1.0.0)
     byebug (9.0.6)
     concurrent-ruby (1.0.5)
     globalid (0.4.0)
       activesupport (>= 4.2.0)
     i18n (0.8.4)
+    jmespath (1.3.1)
     minitest (5.10.2)
     rake (12.0.0)
     sqlite3 (1.3.13)
@@ -41,6 +50,7 @@ PLATFORMS
 
 DEPENDENCIES
   activefile!
+  aws-sdk
   bundler (~> 1.15)
   byebug
   rake

lib/active_file/blob.rb

@@ -7,14 +7,9 @@ class ActiveFile::Blob < ActiveRecord::Base
   has_secure_token :key
   store :metadata, coder: JSON
 
-  class_attribute :verifier, default: -> { Rails.application.message_verifier('ActiveFile') }
   class_attribute :site
 
   class << self
-    def find_verified(signed_id)
-      find(verifier.verify(signed_id))
-    end
-
     def build_after_upload(data:, filename:, content_type: nil, metadata: nil)
       new.tap do |blob|
         blob.filename = name

lib/active_file/sites/s3_site.rb

+require "aws-sdk"
+
+class ActiveFile::Sites::S3Site < ActiveFile::Site
+  attr_reader :client, :bucket
+
+  def initialize(access_key_id:, secret_access_key:, region:, bucket:)
+    @client = Aws::S3::Resource.new(access_key_id: access_key_id, secret_access_key: secret_access_key, region: region)
+    @bucket = @client.bucket(bucket)
+  end
+
+  def upload(key, data)
+    object_for(key).put(body: data)
+  end
+
+  def download(key)
+    if block_given?
+      stream(key, &block)
+    else
+      object_for(key).read
+    end
+  end
+
+  def delete(key)
+    object_for(key).delete
+  end
+
+  def exists?(key)
+    object_for(key).exists?
+  end
+
+
+  def byte_size(key)
+    object_for(key).head[:size]
+  end
+
+  def checksum(key)
+    head = object_for(key).head
+
+    # If the etag has no dashes, it's the MD5
+    if !head.etag.include?("-")
+      head.etag.gsub('"', '')
+    # Check for md5 in metadata if it was uploaded via multipart
+    elsif md5sum = head.meta["md5sum"]
+      md5sum
+    # Otherwise, we don't have a digest yet for this key
+    else
+      nil
+    end
+  end
+
+
+  private
+    def object_for(key)
+      bucket.object(key)
+    end
+
+    # Reads the object for the given key in chunks, yielding each to the block.
+    def stream(key, options = {}, &block)
+      object = object_for(key)
+
+      chunk_size = 5242880 # 5 megabytes
+      offset = 0
+
+      while offset < object.content_length
+        yield object.read(options.merge(:range => "bytes=#{offset}-#{offset + chunk_size - 1}"))
+        offset += chunk_size
+      end
+    end
+end