improve protected branch to add whitelist support (#2451)

* improve protected branch to add whitelist support

* fix lint

* fix style check

* fix tests

* fix description on UI and import

* fix test

* bug fixed

* fix tests and languages

* move isSliceInt64Eq to util pkg; improve function names & typo

models/repo.go

@@ -656,6 +656,42 @@ func (repo *Repository) CanEnableEditor() bool {
 	return !repo.IsMirror
 }
 
+// GetWriters returns all users that have write access to the repository.
+func (repo *Repository) GetWriters() (_ []*User, err error) {
+	return repo.getUsersWithAccessMode(x, AccessModeWrite)
+}
+
+// getUsersWithAccessMode returns users that have at least given access mode to the repository.
+func (repo *Repository) getUsersWithAccessMode(e Engine, mode AccessMode) (_ []*User, err error) {
+	if err = repo.getOwner(e); err != nil {
+		return nil, err
+	}
+
+	accesses := make([]*Access, 0, 10)
+	if err = e.Where("repo_id = ? AND mode >= ?", repo.ID, mode).Find(&accesses); err != nil {
+		return nil, err
+	}
+
+	// Leave a seat for owner itself to append later, but if owner is an organization
+	// and just waste 1 unit is cheaper than re-allocate memory once.
+	users := make([]*User, 0, len(accesses)+1)
+	if len(accesses) > 0 {
+		userIDs := make([]int64, len(accesses))
+		for i := 0; i < len(accesses); i++ {
+			userIDs[i] = accesses[i].UserID
+		}
+
+		if err = e.In("id", userIDs).Find(&users); err != nil {
+			return nil, err
+		}
+	}
+	if !repo.Owner.IsOrganization() {
+		users = append(users, repo.Owner)
+	}
+
+	return users, nil
+}
+
 // NextIssueIndex returns the next issue index
 // FIXME: should have a mutex to prevent producing same index for two issues that are created
 // closely enough.