chore: revert to using copy blob from url option and update changelog

Author: ericenns

CHANGELOG.md

@@ -1,5 +1,8 @@
 ## [Unreleased]
 
+- Add `copy_blob`
+- Update `compose` to use `copy_blob` if 1 source key and blob is <= 256MiB
+
 ## [0.5.6] 2025-01-17
 
 - Fix user delegation key not refreshing (#14)

lib/active_storage/service/azure_blob_service.rb

@@ -124,8 +124,8 @@ def compose(source_keys, destination_key, filename: nil, content_type: nil, disp
       content_disposition = content_disposition_with(type: disposition, filename: filename) if disposition && filename
 
       # use copy_blob operation if composing a new blob from a single existing blob
-      # and that single blob is <= 5000 MiB which is the upper limit for copy_blob operation
-      if source_keys.length == 1 && client.get_blob_properties(source_keys[0]).size <= 5000.megabytes
+      # and that single blob is <= 256 MiB which is the upper limit for copy_blob operation
+      if source_keys.length == 1 && client.get_blob_properties(source_keys[0]).size <= 256.megabytes
         client.copy_blob(destination_key, source_keys[0], metadata: custom_metadata)
       else
         client.create_append_blob(

lib/azure_blob/client.rb

@@ -79,7 +79,7 @@ def get_blob(key, options = {})
 
     # Copy a blob
     #
-    # Calls to {Put Blob From URL}[https://learn.microsoft.com/en-us/rest/api/storageservices/put-blob-from-url]
+    # Calls to {Put Blob From URL}[https://learn.microsoft.com/en-us/rest/api/storageservices/copy-blob-from-url]
     #
     # Takes a key (path) and a source_key (path).
     #
@@ -89,9 +89,8 @@ def copy_blob(key, source_key, options = {})
       source_uri = signed_uri(source_key, permissions: "r", expiry: Time.at(Time.now.to_i + 300).utc.iso8601)
 
       headers = {
-        "Content-Length": 0,
         "x-ms-copy-source": source_uri.to_s,
-        "x-ms-blob-type": "BlockBlob",
+        "x-ms-requires-sync": "true",
       }
 
       Http.new(uri, headers, signer:, **options.slice(:metadata, :tags)).put