Move some asymkey functions to service layer (#28894)

After the moving, all models will not depend on `util.Rename` so that I
can do next step refactoring.

models/asymkey/ssh_key_principals.go

@@ -9,51 +9,11 @@ import (
 	"strings"
 
 	"code.gitea.io/gitea/models/db"
-	"code.gitea.io/gitea/models/perm"
 	user_model "code.gitea.io/gitea/models/user"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/util"
 )
 
-// AddPrincipalKey adds new principal to database and authorized_principals file.
-func AddPrincipalKey(ctx context.Context, ownerID int64, content string, authSourceID int64) (*PublicKey, error) {
-	dbCtx, committer, err := db.TxContext(ctx)
-	if err != nil {
-		return nil, err
-	}
-	defer committer.Close()
-
-	// Principals cannot be duplicated.
-	has, err := db.GetEngine(dbCtx).
-		Where("content = ? AND type = ?", content, KeyTypePrincipal).
-		Get(new(PublicKey))
-	if err != nil {
-		return nil, err
-	} else if has {
-		return nil, ErrKeyAlreadyExist{0, "", content}
-	}
-
-	key := &PublicKey{
-		OwnerID:       ownerID,
-		Name:          content,
-		Content:       content,
-		Mode:          perm.AccessModeWrite,
-		Type:          KeyTypePrincipal,
-		LoginSourceID: authSourceID,
-	}
-	if err = db.Insert(dbCtx, key); err != nil {
-		return nil, fmt.Errorf("addKey: %w", err)
-	}
-
-	if err = committer.Commit(); err != nil {
-		return nil, err
-	}
-
-	committer.Close()
-
-	return key, RewriteAllPrincipalKeys(ctx)
-}
-
 // CheckPrincipalKeyString strips spaces and returns an error if the given principal contains newlines
 func CheckPrincipalKeyString(ctx context.Context, user *user_model.User, content string) (_ string, err error) {
 	if setting.SSH.Disabled {