Fix verifying LFS uploads with GitHub

The verify action, but not upload or batch, requires a user agent.

changelogs/unreleased/254281-add-user-agent-to-git-lfs-client.yml

+---
+title: Fix verifying LFS uploads with GitHub
+merge_request: 43852
+author:
+type: fixed

lib/gitlab/lfs/client.rb

@@ -7,9 +7,11 @@ module Gitlab
     #   * https://github.com/git-lfs/git-lfs/blob/master/docs/api/basic-transfers.md
     class Client
       GIT_LFS_CONTENT_TYPE = 'application/vnd.git-lfs+json'
+      GIT_LFS_USER_AGENT = "GitLab #{Gitlab::VERSION} LFS client"
       DEFAULT_HEADERS = {
         'Accept' => GIT_LFS_CONTENT_TYPE,
-        'Content-Type' => GIT_LFS_CONTENT_TYPE
+        'Content-Type' => GIT_LFS_CONTENT_TYPE,
+        'User-Agent' => GIT_LFS_USER_AGENT
       }.freeze
 
       attr_reader :base_url
@@ -53,7 +55,8 @@ module Gitlab
           body_stream: file,
           headers: {
             'Content-Length' => object.size.to_s,
-            'Content-Type' => 'application/octet-stream'
+            'Content-Type' => 'application/octet-stream',
+            'User-Agent' => GIT_LFS_USER_AGENT
           }.merge(upload_action['header'] || {})
         }
 

spec/lib/gitlab/lfs/client_spec.rb

@@ -8,6 +8,7 @@ RSpec.describe Gitlab::Lfs::Client do
   let(:password) { 'password' }
   let(:credentials) { { user: username, password: password, auth_method: 'password' } }
   let(:git_lfs_content_type) { 'application/vnd.git-lfs+json' }
+  let(:git_lfs_user_agent) { "GitLab #{Gitlab::VERSION} LFS client" }
 
   let(:basic_auth_headers) do
     { 'Authorization' => "Basic #{Base64.strict_encode64("#{username}:#{password}")}" }
@@ -91,7 +92,8 @@ RSpec.describe Gitlab::Lfs::Client do
 
       headers = {
         'Accept' => git_lfs_content_type,
-        'Content-Type' => git_lfs_content_type
+        'Content-Type' => git_lfs_content_type,
+        'User-Agent' => git_lfs_user_agent
       }.merge(headers)
 
       stub_request(:post, base_url + '/info/lfs/objects/batch').with(body: body, headers: headers)
@@ -156,7 +158,8 @@ RSpec.describe Gitlab::Lfs::Client do
     def stub_upload(object:, headers:)
       headers = {
         'Content-Type' => 'application/octet-stream',
-        'Content-Length' => object.size.to_s
+        'Content-Length' => object.size.to_s,
+        'User-Agent' => git_lfs_user_agent
       }.merge(headers)
 
       stub_request(:put, upload_action['href']).with(
@@ -209,7 +212,8 @@ RSpec.describe Gitlab::Lfs::Client do
     def stub_verify(object:, headers:)
       headers = {
         'Accept' => git_lfs_content_type,
-        'Content-Type' => git_lfs_content_type
+        'Content-Type' => git_lfs_content_type,
+        'User-Agent' => git_lfs_user_agent
       }.merge(headers)
 
       stub_request(:post, verify_action['href']).with(