Removes idenfitication by commit from Gitlab::Identifier

Before we would need to identify a user when pushing
through the GitLab UI. Since this is no longer the case
we can remove the identification by commit and instead,
use the identify_using_user

app/workers/post_receive.rb

@@ -31,10 +31,12 @@ class PostReceive
     refs = Set.new
     @user = post_received.identify
 
-    post_received.changes_refs do |oldrev, newrev, ref|
-      @user ||= post_received.identify(newrev)
-      break unless @user
+    unless @user
+      log("Triggered hook for non-existing user \"#{post_received.identifier}\"")
+      return false
+    end
 
+    post_received.changes_refs do |oldrev, newrev, ref|
       if Gitlab::Git.tag_ref?(ref)
         GitTagPushService.new(post_received.project, @user, oldrev: oldrev, newrev: newrev, ref: ref).execute
       elsif Gitlab::Git.branch_ref?(ref)
@@ -45,11 +47,6 @@ class PostReceive
       refs << ref
     end
 
-    unless @user
-      log("Triggered hook for non-existing user \"#{post_received.identifier}\"")
-      return false
-    end
-
     after_project_changes_hooks(post_received, @user, refs.to_a, changes)
   end
 

lib/gitlab/git_post_receive.rb

@@ -11,8 +11,8 @@ module Gitlab
       @changes = deserialize_changes(changes)
     end
 
-    def identify(revision = nil)
-      super(identifier, project, revision)
+    def identify
+      super(identifier)
     end
 
     def changes_refs

lib/gitlab/identifier.rb

 # frozen_string_literal: true
 
 # Detect user based on identifier like
-# key-13 or user-36 or last commit
+# key-13 or user-36
 module Gitlab
   module Identifier
-    def identify(identifier, project = nil, newrev = nil)
-      if identifier.blank?
-        identify_using_commit(project, newrev)
-      elsif identifier =~ /\Auser-\d+\Z/
+    def identify(identifier)
+      if identifier =~ /\Auser-\d+\Z/
         # git push over http
         identify_using_user(identifier)
       elsif identifier =~ /\Akey-\d+\Z/
@@ -16,19 +14,6 @@ module Gitlab
       end
     end
 
-    # Tries to identify a user based on a commit SHA.
-    def identify_using_commit(project, ref)
-      return if project.nil? && ref.nil?
-
-      commit = project.commit(ref)
-
-      return if !commit || !commit.author_email
-
-      identify_with_cache(:email, commit.author_email) do
-        commit.author
-      end
-    end
-
     # Tries to identify a user based on a user identifier (e.g. "user-123").
     # rubocop: disable CodeReuse/ActiveRecord
     def identify_using_user(identifier)

spec/lib/gitlab/identifier_spec.rb

@@ -11,11 +11,8 @@ describe Gitlab::Identifier do
 
   describe '#identify' do
     context 'without an identifier' do
-      it 'identifies the user using a commit' do
-        expect(identifier).to receive(:identify_using_commit)
-          .with(project, '123')
-
-        identifier.identify('', project, '123')
+      it 'returns nil' do
+        expect(identifier.identify('')).to be nil
       end
     end
 
@@ -24,7 +21,7 @@ describe Gitlab::Identifier do
         expect(identifier).to receive(:identify_using_user)
           .with("user-#{user.id}")
 
-        identifier.identify("user-#{user.id}", project, '123')
+        identifier.identify("user-#{user.id}")
       end
     end
 
@@ -33,49 +30,11 @@ describe Gitlab::Identifier do
         expect(identifier).to receive(:identify_using_ssh_key)
           .with("key-#{key.id}")
 
-        identifier.identify("key-#{key.id}", project, '123')
+        identifier.identify("key-#{key.id}")
       end
     end
   end
 
-  describe '#identify_using_commit' do
-    it "returns the User for an existing commit author's Email address" do
-      commit = double(:commit, author: user, author_email: user.email)
-
-      expect(project).to receive(:commit).with('123').and_return(commit)
-
-      expect(identifier.identify_using_commit(project, '123')).to eq(user)
-    end
-
-    it 'returns nil when no user could be found' do
-      allow(project).to receive(:commit).with('123').and_return(nil)
-
-      expect(identifier.identify_using_commit(project, '123')).to be_nil
-    end
-
-    it 'returns nil when the commit does not have an author Email' do
-      commit = double(:commit, author_email: nil)
-
-      expect(project).to receive(:commit).with('123').and_return(commit)
-
-      expect(identifier.identify_using_commit(project, '123')).to be_nil
-    end
-
-    it 'caches the found users per Email' do
-      commit = double(:commit, author: user, author_email: user.email)
-
-      expect(project).to receive(:commit).with('123').twice.and_return(commit)
-
-      2.times do
-        expect(identifier.identify_using_commit(project, '123')).to eq(user)
-      end
-    end
-
-    it 'returns nil if the project & ref are not present' do
-      expect(identifier.identify_using_commit(nil, nil)).to be_nil
-    end
-  end
-
   describe '#identify_using_user' do
     it 'returns the User for an existing ID in the identifier' do
       found = identifier.identify_using_user("user-#{user.id}")

spec/workers/post_receive_spec.rb

@@ -41,6 +41,17 @@ describe PostReceive do
       end
     end
 
+    context 'unidentified user' do
+      let!(:key_id) { "" }
+
+      it 'returns false' do
+        expect(GitPushService).not_to receive(:new)
+        expect(GitTagPushService).not_to receive(:new)
+
+        expect(described_class.new.perform(gl_repository, key_id, base64_changes)).to be false
+      end
+    end
+
     context 'with changes' do
       before do
         allow_any_instance_of(Gitlab::GitPostReceive).to receive(:identify).and_return(project.owner)