Copy and paste importer from Bitbucket Importer

lib/gitlab/bitbucket_server_import/importer.rb

+module Gitlab
+  module BitbucketServerImport
+    class Importer
+      include Gitlab::ShellAdapter
+
+      LABELS = [{ title: 'bug', color: '#FF0000' },
+                { title: 'enhancement', color: '#428BCA' },
+                { title: 'proposal', color: '#69D100' },
+                { title: 'task', color: '#7F8C8D' }].freeze
+
+      attr_reader :project, :client, :errors, :users
+
+      def initialize(project)
+        @project = project
+        @client = BitbucketServer::Client.new(project.import_data.credentials)
+        @formatter = Gitlab::ImportFormatter.new
+        @labels = {}
+        @errors = []
+        @users = {}
+      end
+
+      def execute
+        import_issues
+        import_pull_requests
+        handle_errors
+
+        true
+      end
+
+      private
+
+      def handle_errors
+        return unless errors.any?
+
+        project.update_column(:import_error, {
+          message: 'The remote data could not be fully imported.',
+          errors: errors
+        }.to_json)
+      end
+
+      def gitlab_user_id(project, username)
+        find_user_id(username) || project.creator_id
+      end
+
+      def find_user_id(username)
+        return nil unless username
+
+        return users[username] if users.key?(username)
+
+        users[username] = User.select(:id)
+                              .joins(:identities)
+                              .find_by("identities.extern_uid = ? AND identities.provider = 'bitbucket'", username)
+                              .try(:id)
+      end
+
+      def repo
+        @repo ||= client.repo(project.import_source)
+      end
+
+      def import_issues
+        return unless repo.issues_enabled?
+
+        create_labels
+
+        client.issues(repo).each do |issue|
+          begin
+            description = ''
+            description += @formatter.author_line(issue.author) unless find_user_id(issue.author)
+            description += issue.description
+
+            label_name = issue.kind
+            milestone = issue.milestone ? project.milestones.find_or_create_by(title: issue.milestone) : nil
+
+            gitlab_issue = project.issues.create!(
+              iid: issue.iid,
+              title: issue.title,
+              description: description,
+              state: issue.state,
+              author_id: gitlab_user_id(project, issue.author),
+              milestone: milestone,
+              created_at: issue.created_at,
+              updated_at: issue.updated_at
+            )
+
+            gitlab_issue.labels << @labels[label_name]
+
+            import_issue_comments(issue, gitlab_issue) if gitlab_issue.persisted?
+          rescue StandardError => e
+            errors << { type: :issue, iid: issue.iid, errors: e.message }
+          end
+        end
+      end
+
+      def import_issue_comments(issue, gitlab_issue)
+        client.issue_comments(repo, issue.iid).each do |comment|
+          # The note can be blank for issue service messages like "Changed title: ..."
+          # We would like to import those comments as well but there is no any
+          # specific parameter that would allow to process them, it's just an empty comment.
+          # To prevent our importer from just crashing or from creating useless empty comments
+          # we do this check.
+          next unless comment.note.present?
+
+          note = ''
+          note += @formatter.author_line(comment.author) unless find_user_id(comment.author)
+          note += comment.note
+
+          begin
+            gitlab_issue.notes.create!(
+              project: project,
+              note: note,
+              author_id: gitlab_user_id(project, comment.author),
+              created_at: comment.created_at,
+              updated_at: comment.updated_at
+            )
+          rescue StandardError => e
+            errors << { type: :issue_comment, iid: issue.iid, errors: e.message }
+          end
+        end
+      end
+
+      def create_labels
+        LABELS.each do |label_params|
+          label = ::Labels::CreateService.new(label_params).execute(project: project)
+          if label.valid?
+            @labels[label_params[:title]] = label
+          else
+            raise "Failed to create label \"#{label_params[:title]}\" for project \"#{project.full_name}\""
+          end
+        end
+      end
+
+      def import_pull_requests
+        pull_requests = client.pull_requests(repo)
+
+        pull_requests.each do |pull_request|
+          begin
+            description = ''
+            description += @formatter.author_line(pull_request.author) unless find_user_id(pull_request.author)
+            description += pull_request.description
+
+            source_branch_sha = pull_request.source_branch_sha
+            target_branch_sha = pull_request.target_branch_sha
+            source_branch_sha = project.repository.commit(source_branch_sha)&.sha || source_branch_sha
+            target_branch_sha = project.repository.commit(target_branch_sha)&.sha || target_branch_sha
+
+            merge_request = project.merge_requests.create!(
+              iid: pull_request.iid,
+              title: pull_request.title,
+              description: description,
+              source_project: project,
+              source_branch: pull_request.source_branch_name,
+              source_branch_sha: source_branch_sha,
+              target_project: project,
+              target_branch: pull_request.target_branch_name,
+              target_branch_sha: target_branch_sha,
+              state: pull_request.state,
+              author_id: gitlab_user_id(project, pull_request.author),
+              assignee_id: nil,
+              created_at: pull_request.created_at,
+              updated_at: pull_request.updated_at
+            )
+
+            import_pull_request_comments(pull_request, merge_request) if merge_request.persisted?
+          rescue StandardError => e
+            errors << { type: :pull_request, iid: pull_request.iid, errors: e.message, trace: e.backtrace.join("\n"), raw_response: pull_request.raw }
+          end
+        end
+      end
+
+      def import_pull_request_comments(pull_request, merge_request)
+        comments = client.pull_request_comments(repo, pull_request.iid)
+
+        inline_comments, pr_comments = comments.partition(&:inline?)
+
+        import_inline_comments(inline_comments, pull_request, merge_request)
+        import_standalone_pr_comments(pr_comments, merge_request)
+      end
+
+      def import_inline_comments(inline_comments, pull_request, merge_request)
+        line_code_map = {}
+
+        children, parents = inline_comments.partition(&:has_parent?)
+
+        # The BitbucketServer API returns threaded replies as parent-child
+        # relationships. We assume that the child can appear in any order in
+        # the JSON.
+        parents.each do |comment|
+          line_code_map[comment.iid] = generate_line_code(comment)
+        end
+
+        children.each do |comment|
+          line_code_map[comment.iid] = line_code_map.fetch(comment.parent_id, nil)
+        end
+
+        inline_comments.each do |comment|
+          begin
+            attributes = pull_request_comment_attributes(comment)
+            attributes.merge!(
+              position: build_position(merge_request, comment),
+              line_code: line_code_map.fetch(comment.iid),
+              type: 'DiffNote')
+
+            merge_request.notes.create!(attributes)
+          rescue StandardError => e
+            errors << { type: :pull_request, iid: comment.iid, errors: e.message }
+          end
+        end
+      end
+
+      def build_position(merge_request, pr_comment)
+        params = {
+          diff_refs: merge_request.diff_refs,
+          old_path: pr_comment.file_path,
+          new_path: pr_comment.file_path,
+          old_line: pr_comment.old_pos,
+          new_line: pr_comment.new_pos
+        }
+
+        Gitlab::Diff::Position.new(params)
+      end
+
+      def import_standalone_pr_comments(pr_comments, merge_request)
+        pr_comments.each do |comment|
+          begin
+            merge_request.notes.create!(pull_request_comment_attributes(comment))
+          rescue StandardError => e
+            errors << { type: :pull_request, iid: comment.iid, errors: e.message }
+          end
+        end
+      end
+
+      def generate_line_code(pr_comment)
+        Gitlab::Git.diff_line_code(pr_comment.file_path, pr_comment.new_pos, pr_comment.old_pos)
+      end
+
+      def pull_request_comment_attributes(comment)
+        {
+          project: project,
+          note: comment.note,
+          author_id: gitlab_user_id(project, comment.author),
+          created_at: comment.created_at,
+          updated_at: comment.updated_at
+        }
+      end
+    end
+  end
+end

lib/gitlab/bitbucket_server_import/project_creator.rb

+module Gitlab
+  module BitbucketServerImport
+    class ProjectCreator
+      attr_reader :repo, :name, :namespace, :current_user, :session_data
+
+      def initialize(repo, name, namespace, current_user, session_data)
+        @repo = repo
+        @name = name
+        @namespace = namespace
+        @current_user = current_user
+        @session_data = session_data
+      end
+
+      def execute
+        ::Projects::CreateService.new(
+          current_user,
+          name: name,
+          path: name,
+          description: repo.description,
+          namespace_id: namespace.id,
+          visibility_level: repo.visibility_level,
+          import_type: 'bitbucket',
+          import_source: repo.full_name,
+          import_url: repo.clone_url(session_data[:token]),
+          import_data: { credentials: session_data },
+          skip_wiki: skip_wiki
+        ).execute
+      end
+
+      private
+
+      def skip_wiki
+        repo.has_wiki?
+      end
+    end
+  end
+end