Add RevertService class with basic logic to revert commit

1 files changed, 48 insertions, 0 deletions

diff --git a/app/services/commits/revert_service.rb b/app/services/commits/revert_service.rb
new file mode 100644
index 00000000000..4a364f0d86a
--- /dev/null
+++ b/app/services/commits/revert_service.rb
@@ -0,0 +1,48 @@
+module Commits
+  class RevertService < ::BaseService
+    class ValidationError < StandardError; end
+
+    def execute
+      @source_project = params[:source_project] || @project
+      @target_branch  = params[:target_branch]
+      @commit_to_revert = @source_project.commit(params[:revert_commit_id])
+
+      # Check push permissions to branch
+      validate
+
+      if commit
+        success
+      else
+        error("Something went wrong. Your changes were not committed")
+      end
+    rescue Repository::CommitError, Gitlab::Git::Repository::InvalidBlobName, GitHooksService::PreReceiveError, ValidationError => ex
+      error(ex.message)
+    end
+
+    def commit
+      raw_repo = repository.rugged
+
+      # Create branch with revert commit
+      reverted = repository.revert(current_user, @commit_to_revert.id,
+                                   @commit_to_revert.revert_branch_name, @target_branch,
+                                   @commit_to_revert.revert_message)
+      repository.rm_branch(current_user, @commit_to_revert.revert_branch_name)
+
+      reverted
+    end
+
+    private
+
+    def raise_error(message)
+      raise ValidationError.new(message)
+    end
+
+    def validate
+      allowed = ::Gitlab::GitAccess.new(current_user, project).can_push_to_branch?(@target_branch)
+
+      unless allowed
+        raise_error("You are not allowed to push into this branch")
+      end
+    end
+  end
+end