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// Copyright 2017 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package user
import (
"context"
"code.gitea.io/gitea/models/db"
"code.gitea.io/gitea/modules/timeutil"
)
// Follow represents relations of user and their followers.
type Follow struct {
ID int64 `xorm:"pk autoincr"`
UserID int64 `xorm:"UNIQUE(follow)"`
FollowID int64 `xorm:"UNIQUE(follow)"`
CreatedUnix timeutil.TimeStamp `xorm:"INDEX created"`
}
func init() {
db.RegisterModel(new(Follow))
}
// IsFollowing returns true if user is following followID.
func IsFollowing(ctx context.Context, userID, followID int64) bool {
has, _ := db.GetEngine(ctx).Get(&Follow{UserID: userID, FollowID: followID})
return has
}
// FollowUser marks someone be another's follower.
func FollowUser(ctx context.Context, userID, followID int64) (err error) {
if userID == followID || IsFollowing(ctx, userID, followID) {
return nil
}
if IsBlocked(ctx, userID, followID) || IsBlocked(ctx, followID, userID) {
return ErrBlockedByUser
}
ctx, committer, err := db.TxContext(ctx)
if err != nil {
return err
}
defer committer.Close()
if err = db.Insert(ctx, &Follow{UserID: userID, FollowID: followID}); err != nil {
return err
}
if _, err = db.Exec(ctx, "UPDATE `user` SET num_followers = num_followers + 1 WHERE id = ?", followID); err != nil {
return err
}
if _, err = db.Exec(ctx, "UPDATE `user` SET num_following = num_following + 1 WHERE id = ?", userID); err != nil {
return err
}
return committer.Commit()
}
// UnfollowUser unmarks someone as another's follower.
func UnfollowUser(ctx context.Context, userID, followID int64) (err error) {
if userID == followID || !IsFollowing(ctx, userID, followID) {
return nil
}
ctx, committer, err := db.TxContext(ctx)
if err != nil {
return err
}
defer committer.Close()
if _, err = db.DeleteByBean(ctx, &Follow{UserID: userID, FollowID: followID}); err != nil {
return err
}
if _, err = db.Exec(ctx, "UPDATE `user` SET num_followers = num_followers - 1 WHERE id = ?", followID); err != nil {
return err
}
if _, err = db.Exec(ctx, "UPDATE `user` SET num_following = num_following - 1 WHERE id = ?", userID); err != nil {
return err
}
return committer.Commit()
}
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