Merge branch 'lfs-ssh-authorization-fix' into 'master'

Do not regenerate the `lfs_token` every time `git-lfs-authenticate` is called

## What does this MR do?

 Do not regenerate the `lfs_token` every time `git-lfs-authenticate` is called, instead return the saved token if one is present.

This was causing a lot of 401s, leading to 403s, as state in #22527

As it turns out, when pushing a lot of LFS objects, the LFS client was calling `git-lfs-authenticate` in the middle of the request again. This caused the `lfs_token` to be regenerated. The problem lies in that the LFS client was not aware of this change, and was still using the old token. This caused all subsequent requests to fail with a 401 error.

Since HTTP Auth is protected by Rack Attack, this 401s where immediately flagged and resulted in the IP of the user being banned. 

With this change, GitLab returns the value stored in Redis, if one is present, thus if the LFS client calls `git-lfs-authenticate` again during the request, the auth header will remain unchanged, allowing all subsequent requests to continue without issues.

## What are the relevant issue numbers?

Fixes #22527

cc @SeanPackham @jacobvosmaer-gitlab

See merge request !6551

2 files changed, 6 insertions, 6 deletions

diff --git a/spec/lib/gitlab/auth_spec.rb b/spec/lib/gitlab/auth_spec.rb
index 745fbc0df45..c9d64e99f88 100644
--- a/spec/lib/gitlab/auth_spec.rb
+++ b/spec/lib/gitlab/auth_spec.rb
@@ -64,7 +64,7 @@ describe Gitlab::Auth, lib: true do
     it 'recognizes user lfs tokens' do
       user = create(:user)
       ip = 'ip'
-      token = Gitlab::LfsToken.new(user).generate
+      token = Gitlab::LfsToken.new(user).token
 
       expect(gl_auth).to receive(:rate_limit!).with(ip, success: true, login: user.username)
       expect(gl_auth.find_for_git_client(user.username, token, project: nil, ip: ip)).to eq(Gitlab::Auth::Result.new(user, nil, :lfs_token, full_authentication_abilities))
@@ -73,7 +73,7 @@ describe Gitlab::Auth, lib: true do
     it 'recognizes deploy key lfs tokens' do
       key = create(:deploy_key)
       ip = 'ip'
-      token = Gitlab::LfsToken.new(key).generate
+      token = Gitlab::LfsToken.new(key).token
 
       expect(gl_auth).to receive(:rate_limit!).with(ip, success: true, login: "lfs+deploy-key-#{key.id}")
       expect(gl_auth.find_for_git_client("lfs+deploy-key-#{key.id}", token, project: nil, ip: ip)).to eq(Gitlab::Auth::Result.new(key, nil, :lfs_deploy_token, read_authentication_abilities))
diff --git a/spec/lib/gitlab/lfs_token_spec.rb b/spec/lib/gitlab/lfs_token_spec.rb
index 9f04f67e0a8..e9c1163e22a 100644
--- a/spec/lib/gitlab/lfs_token_spec.rb
+++ b/spec/lib/gitlab/lfs_token_spec.rb
@@ -1,10 +1,10 @@
 require 'spec_helper'
 
 describe Gitlab::LfsToken, lib: true do
-  describe '#generate and #value' do
+  describe '#token' do
     shared_examples 'an LFS token generator' do
       it 'returns a randomly generated token' do
-        token = handler.generate
+        token = handler.token
 
         expect(token).not_to be_nil
         expect(token).to be_a String
@@ -12,9 +12,9 @@ describe Gitlab::LfsToken, lib: true do
       end
 
       it 'returns the correct token based on the key' do
-        token = handler.generate
+        token = handler.token
 
-        expect(handler.value).to eq(token)
+        expect(handler.token).to eq(token)
       end
     end