Permit opening a blob in a custom tempdir

3 files changed, 12 insertions, 7 deletions

diff --git a/activestorage/lib/active_storage/analyzer.rb b/activestorage/lib/active_storage/analyzer.rb
index 8dcfb9d7bd..caa25418a5 100644
--- a/activestorage/lib/active_storage/analyzer.rb
+++ b/activestorage/lib/active_storage/analyzer.rb
@@ -24,11 +24,15 @@ module ActiveStorage
     private
       # Downloads the blob to a tempfile on disk. Yields the tempfile.
       def download_blob_to_tempfile(&block) #:doc:
-        blob.open(&block)
+        blob.open tempdir: tempdir, &block
       end
 
       def logger #:doc:
         ActiveStorage.logger
       end
+
+      def tempdir #:doc:
+        Dir.tmpdir
+      end
   end
 end
diff --git a/activestorage/lib/active_storage/downloader.rb b/activestorage/lib/active_storage/downloader.rb
index 7f5b4936a5..0e7039e104 100644
--- a/activestorage/lib/active_storage/downloader.rb
+++ b/activestorage/lib/active_storage/downloader.rb
@@ -1,9 +1,10 @@
 # frozen_string_literal: true
 
 module ActiveStorage
-  class Downloader
-    def initialize(blob)
-      @blob = blob
+  class Downloader #:nodoc:
+    def initialize(blob, tempdir: nil)
+      @blob    = blob
+      @tempdir = tempdir
     end
 
     def download_blob_to_tempfile
@@ -14,10 +15,10 @@ module ActiveStorage
     end
 
     private
-      attr_reader :blob
+      attr_reader :blob, :tempdir
 
       def open_tempfile
-        file = Tempfile.open([ "ActiveStorage", tempfile_extension_with_delimiter ])
+        file = Tempfile.open([ "ActiveStorage", tempfile_extension_with_delimiter ], tempdir)
 
         begin
           yield file
diff --git a/activestorage/lib/active_storage/previewer.rb b/activestorage/lib/active_storage/previewer.rb
index f09dc25879..bff5e42d41 100644
--- a/activestorage/lib/active_storage/previewer.rb
+++ b/activestorage/lib/active_storage/previewer.rb
@@ -26,7 +26,7 @@ module ActiveStorage
     private
       # Downloads the blob to a tempfile on disk. Yields the tempfile.
       def download_blob_to_tempfile(&block) #:doc:
-        blob.open(&block)
+        blob.open tempdir: tempdir, &block
       end
 
       # Executes a system command, capturing its binary output in a tempfile. Yields the tempfile.