1 files changed, 338 insertions, 0 deletions
diff --git a/bridge/gitlab/import.go b/bridge/gitlab/import.go
new file mode 100644
index 00000000..8f4ceec9
--- /dev/null
+++ b/bridge/gitlab/import.go
@@ -0,0 +1,338 @@
+package gitlab
+
+import (
+	"fmt"
+	"strconv"
+	"time"
+
+	"github.com/xanzy/go-gitlab"
+
+	"github.com/MichaelMure/git-bug/bridge/core"
+	"github.com/MichaelMure/git-bug/bug"
+	"github.com/MichaelMure/git-bug/cache"
+	"github.com/MichaelMure/git-bug/identity"
+	"github.com/MichaelMure/git-bug/util/git"
+	"github.com/MichaelMure/git-bug/util/text"
+)
+
+// gitlabImporter implement the Importer interface
+type gitlabImporter struct {
+	conf core.Configuration
+
+	// iterator
+	iterator *iterator
+
+	// number of imported issues
+	importedIssues int
+
+	// number of imported identities
+	importedIdentities int
+}
+
+func (gi *gitlabImporter) Init(conf core.Configuration) error {
+	gi.conf = conf
+	return nil
+}
+
+// ImportAll iterate over all the configured repository issues (notes) and ensure the creation
+// of the missing issues / comments / label events / title changes ...
+func (gi *gitlabImporter) ImportAll(repo *cache.RepoCache, since time.Time) error {
+	gi.iterator = NewIterator(gi.conf[keyProjectID], gi.conf[keyToken], since)
+
+	// Loop over all matching issues
+	for gi.iterator.NextIssue() {
+		issue := gi.iterator.IssueValue()
+		fmt.Printf("importing issue: %v\n", issue.Title)
+
+		// create issue
+		b, err := gi.ensureIssue(repo, issue)
+		if err != nil {
+			return fmt.Errorf("issue creation: %v", err)
+		}
+
+		// Loop over all notes
+		for gi.iterator.NextNote() {
+			note := gi.iterator.NoteValue()
+			if err := gi.ensureNote(repo, b, note); err != nil {
+				return fmt.Errorf("note creation: %v", err)
+			}
+		}
+
+		// Loop over all label events
+		for gi.iterator.NextLabelEvent() {
+			labelEvent := gi.iterator.LabelEventValue()
+			if err := gi.ensureLabelEvent(repo, b, labelEvent); err != nil {
+				return fmt.Errorf("label event creation: %v", err)
+			}
+		}
+
+		if err := gi.iterator.Error(); err != nil {
+			fmt.Printf("import error: %v\n", err)
+			return err
+		}
+
+		// commit bug state
+		if err := b.CommitAsNeeded(); err != nil {
+			return fmt.Errorf("bug commit: %v", err)
+		}
+	}
+
+	fmt.Printf("Successfully imported %d issues and %d identities from Gitlab\n", gi.importedIssues, gi.importedIdentities)
+	return nil
+}
+
+func (gi *gitlabImporter) ensureIssue(repo *cache.RepoCache, issue *gitlab.Issue) (*cache.BugCache, error) {
+	// ensure issue author
+	author, err := gi.ensurePerson(repo, issue.Author.ID)
+	if err != nil {
+		return nil, err
+	}
+
+	// resolve bug
+	b, err := repo.ResolveBugCreateMetadata(keyGitlabUrl, issue.WebURL)
+	if err != nil && err != bug.ErrBugNotExist {
+		return nil, err
+	}
+
+	if err == nil {
+		return b, nil
+	}
+
+	// if bug was never imported
+	cleanText, err := text.Cleanup(issue.Description)
+	if err != nil {
+		return nil, err
+	}
+
+	// create bug
+	b, _, err = repo.NewBugRaw(
+		author,
+		issue.CreatedAt.Unix(),
+		issue.Title,
+		cleanText,
+		nil,
+		map[string]string{
+			core.KeyOrigin:   target,
+			keyGitlabId:      parseID(issue.ID),
+			keyGitlabUrl:     issue.WebURL,
+			keyGitlabProject: gi.conf[keyProjectID],
+		},
+	)
+
+	if err != nil {
+		return nil, err
+	}
+
+	// importing a new bug
+	gi.importedIssues++
+
+	return b, nil
+}
+
+func (gi *gitlabImporter) ensureNote(repo *cache.RepoCache, b *cache.BugCache, note *gitlab.Note) error {
+	id := parseID(note.ID)
+
+	// ensure issue author
+	author, err := gi.ensurePerson(repo, note.Author.ID)
+	if err != nil {
+		return err
+	}
+
+	noteType, body := GetNoteType(note)
+	switch noteType {
+	case NOTE_CLOSED:
+		_, err = b.CloseRaw(
+			author,
+			note.CreatedAt.Unix(),
+			map[string]string{
+				keyGitlabId: id,
+			},
+		)
+		return err
+
+	case NOTE_REOPENED:
+		_, err = b.OpenRaw(
+			author,
+			note.CreatedAt.Unix(),
+			map[string]string{
+				keyGitlabId: id,
+			},
+		)
+		return err
+
+	case NOTE_DESCRIPTION_CHANGED:
+		issue := gi.iterator.IssueValue()
+
+		firstComment := b.Snapshot().Comments[0]
+		// since gitlab doesn't provide the issue history
+		// we should check for "changed the description" notes and compare issue texts
+		// TODO: Check only one time and ignore next 'description change' within one issue
+		if issue.Description != firstComment.Message {
+
+			// comment edition
+			_, err = b.EditCommentRaw(
+				author,
+				note.UpdatedAt.Unix(),
+				git.Hash(firstComment.Id()),
+				issue.Description,
+				map[string]string{
+					keyGitlabId: id,
+				},
+			)
+
+			return err
+		}
+
+	case NOTE_COMMENT:
+		hash, errResolve := b.ResolveOperationWithMetadata(keyGitlabId, id)
+		if errResolve != cache.ErrNoMatchingOp {
+			return errResolve
+		}
+
+		cleanText, err := text.Cleanup(body)
+		if err != nil {
+			return err
+		}
+
+		// if we didn't import the comment
+		if errResolve == cache.ErrNoMatchingOp {
+
+			// add comment operation
+			_, err = b.AddCommentRaw(
+				author,
+				note.CreatedAt.Unix(),
+				cleanText,
+				nil,
+				map[string]string{
+					keyGitlabId: id,
+				},
+			)
+
+			return err
+		}
+
+		// if comment was already exported
+
+		// search for last comment update
+		comment, err := b.Snapshot().SearchComment(hash)
+		if err != nil {
+			return err
+		}
+
+		// compare local bug comment with the new note body
+		if comment.Message != cleanText {
+			// comment edition
+			_, err = b.EditCommentRaw(
+				author,
+				note.UpdatedAt.Unix(),
+				git.Hash(comment.Id()),
+				cleanText,
+				nil,
+			)
+
+			return err
+		}
+
+		return nil
+
+	case NOTE_TITLE_CHANGED:
+		// title change events are given new notes
+		_, err = b.SetTitleRaw(
+			author,
+			note.CreatedAt.Unix(),
+			body,
+			map[string]string{
+				keyGitlabId: id,
+			},
+		)
+
+		return err
+
+	case NOTE_UNKNOWN:
+		return nil
+
+	default:
+		panic("unhandled note type")
+	}
+
+	return nil
+}
+
+func (gi *gitlabImporter) ensureLabelEvent(repo *cache.RepoCache, b *cache.BugCache, labelEvent *gitlab.LabelEvent) error {
+	_, err := b.ResolveOperationWithMetadata(keyGitlabId, parseID(labelEvent.ID))
+	if err != cache.ErrNoMatchingOp {
+		return err
+	}
+
+	// ensure issue author
+	author, err := gi.ensurePerson(repo, labelEvent.User.ID)
+	if err != nil {
+		return err
+	}
+
+	switch labelEvent.Action {
+	case "add":
+		_, err = b.ForceChangeLabelsRaw(
+			author,
+			labelEvent.CreatedAt.Unix(),
+			[]string{labelEvent.Label.Name},
+			nil,
+			map[string]string{
+				keyGitlabId: parseID(labelEvent.ID),
+			},
+		)
+
+	case "remove":
+		_, err = b.ForceChangeLabelsRaw(
+			author,
+			labelEvent.CreatedAt.Unix(),
+			nil,
+			[]string{labelEvent.Label.Name},
+			map[string]string{
+				keyGitlabId: parseID(labelEvent.ID),
+			},
+		)
+
+	default:
+		err = fmt.Errorf("unexpected label event action")
+	}
+
+	return err
+}
+
+func (gi *gitlabImporter) ensurePerson(repo *cache.RepoCache, id int) (*cache.IdentityCache, error) {
+	// Look first in the cache
+	i, err := repo.ResolveIdentityImmutableMetadata(keyGitlabId, strconv.Itoa(id))
+	if err == nil {
+		return i, nil
+	}
+	if _, ok := err.(identity.ErrMultipleMatch); ok {
+		return nil, err
+	}
+
+	client := buildClient(gi.conf["token"])
+
+	user, _, err := client.Users.GetUser(id)
+	if err != nil {
+		return nil, err
+	}
+
+	// importing a new identity
+	gi.importedIdentities++
+
+	return repo.NewIdentityRaw(
+		user.Name,
+		user.PublicEmail,
+		user.Username,
+		user.AvatarURL,
+		map[string]string{
+			// because Gitlab
+			keyGitlabId:    strconv.Itoa(id),
+			keyGitlabLogin: user.Username,
+		},
+	)
+}
+
+func parseID(id int) string {
+	return fmt.Sprintf("%d", id)
+}