feat: invite management API: DELETE /v1/user/invite/:id (204, cancels a pending invite) and POST /v1/user/invite/:id/renew (200, new code, expires_at = now+3d, created_at = now, resends the invitation email, old link dead)

internal/infrastructure/useCases/CancelInvite.go

@@ -0,0 +1,18 @@
+package useCases
+
+import "RenewCMS/internal/domain/invite"
+
+type CancelInviteUseCase struct {
+	inviteRepository invite.Repository
+}
+
+func NewCancelInviteUseCase(inviteRepository invite.Repository) *CancelInviteUseCase {
+	return &CancelInviteUseCase{inviteRepository}
+}
+
+func (c *CancelInviteUseCase) CancelInvite(id uint32) error {
+	if _, err := findManageableInvite(c.inviteRepository, id); err != nil {
+		return err
+	}
+	return c.inviteRepository.Delete(id)
+}

internal/infrastructure/useCases/CreateInvite.go

@@ -6,21 +6,15 @@ import (
 	"RenewCMS/internal/domain/mail"
 	"RenewCMS/internal/domain/user"
 	"errors"
-	"fmt"
 	"strings"
 	"time"
-
-	"github.com/google/uuid"
 )
 
-const inviteTemplateName = "invitation"
-
 type CreateInviteUseCase struct {
 	userRepository   user.Repository
 	inviteRepository invite.Repository
 	hasher           hash.Hasher
-	mailRepository   mail.Repository
-	publicURL        string
+	mailer           inviteMailer
 }
 
 type CreateInviteCommand struct {
@@ -28,20 +22,8 @@ type CreateInviteCommand struct {
 	InvitedBy uint32
 }
 
-type MailInviteData struct {
-	Host             string
-	VerificationCode string
-	Email            string
-	InvitedBy        string
-}
-
-func (d MailInviteData) Subject() string {
-	inviter := strings.NewReplacer("\r", " ", "\n", " ").Replace(d.InvitedBy)
-	return inviter + " invited you to RenewCMS"
-}
-
 func NewCreateInviteUseCase(userRepository user.Repository, inviteRepository invite.Repository, hasher hash.Hasher, mailRepository mail.Repository, publicURL string) *CreateInviteUseCase {
-	return &CreateInviteUseCase{userRepository, inviteRepository, hasher, mailRepository, publicURL}
+	return &CreateInviteUseCase{userRepository, inviteRepository, hasher, inviteMailer{mailRepository, publicURL}}
 }
 
 func (g *CreateInviteUseCase) CreateInvite(command CreateInviteCommand) (invite.Invite, error) {
@@ -61,8 +43,7 @@ func (g *CreateInviteUseCase) CreateInvite(command CreateInviteCommand) (invite.
 		return invite.Invite{}, err
 	}
 
-	rawCode := uuid.NewString()
-	hashedCode, err := g.hasher.Hash(rawCode)
+	rawCode, hashedCode, err := newInviteCode(g.hasher)
 	if err != nil {
 		return invite.Invite{}, err
 	}
@@ -78,13 +59,7 @@ func (g *CreateInviteUseCase) CreateInvite(command CreateInviteCommand) (invite.
 		return invite.Invite{}, err
 	}
 
-	if err := g.mailRepository.Send(email, inviteTemplateName, MailInviteData{
-		Host:             g.publicURL,
-		VerificationCode: rawCode,
-		Email:            email,
-		InvitedBy:        inviterName(inviter),
-	}); err != nil {
-		sendErr := fmt.Errorf("%w: %w", invite.ErrInviteEmailNotSent, err)
+	if sendErr := g.mailer.send(email, rawCode, inviter); sendErr != nil {
 		if deleteErr := g.inviteRepository.Delete(createdInvite.ID); deleteErr != nil {
 			return invite.Invite{}, errors.Join(sendErr, deleteErr)
 		}
@@ -119,10 +94,3 @@ func (g *CreateInviteUseCase) discardOpenInvite(email string, now time.Time) err
 	}
 	return nil
 }
-
-func inviterName(inviter user.User) string {
-	if inviter.DisplayName != "" {
-		return inviter.DisplayName
-	}
-	return inviter.Username
-}

internal/infrastructure/useCases/RenewInvite.go

@@ -0,0 +1,59 @@
+package useCases
+
+import (
+	"RenewCMS/internal/domain/hash"
+	"RenewCMS/internal/domain/invite"
+	"RenewCMS/internal/domain/mail"
+	"RenewCMS/internal/domain/user"
+	"errors"
+	"time"
+)
+
+type RenewInviteUseCase struct {
+	userRepository   user.Repository
+	inviteRepository invite.Repository
+	hasher           hash.Hasher
+	mailer           inviteMailer
+}
+
+type RenewInviteCommand struct {
+	ID        uint32
+	RenewedBy uint32
+}
+
+func NewRenewInviteUseCase(userRepository user.Repository, inviteRepository invite.Repository, hasher hash.Hasher, mailRepository mail.Repository, publicURL string) *RenewInviteUseCase {
+	return &RenewInviteUseCase{userRepository, inviteRepository, hasher, inviteMailer{mailRepository, publicURL}}
+}
+
+func (u *RenewInviteUseCase) RenewInvite(command RenewInviteCommand) (invite.Invite, error) {
+	now := time.Now()
+
+	renewer, err := u.userRepository.Get(command.RenewedBy)
+	if err != nil {
+		return invite.Invite{}, err
+	}
+
+	previous, err := findManageableInvite(u.inviteRepository, command.ID)
+	if err != nil {
+		return invite.Invite{}, err
+	}
+
+	rawCode, hashedCode, err := newInviteCode(u.hasher)
+	if err != nil {
+		return invite.Invite{}, err
+	}
+
+	renewed, err := u.inviteRepository.Renew(previous.ID, hashedCode, now.Add(invite.Lifetime), now)
+	if err != nil {
+		return invite.Invite{}, err
+	}
+
+	if sendErr := u.mailer.send(renewed.Email, rawCode, renewer); sendErr != nil {
+		if _, restoreErr := u.inviteRepository.Renew(previous.ID, previous.HashedCode, previous.ExpiresAt, previous.CreatedAt); restoreErr != nil {
+			return invite.Invite{}, errors.Join(sendErr, restoreErr)
+		}
+		return invite.Invite{}, sendErr
+	}
+
+	return renewed, nil
+}

internal/infrastructure/useCases/inviteLookup.go

@@ -0,0 +1,16 @@
+package useCases
+
+import "RenewCMS/internal/domain/invite"
+
+func findManageableInvite(inviteRepository invite.Repository, id uint32) (invite.Invite, error) {
+	for _, existing := range inviteRepository.GetAll() {
+		if existing.ID != id {
+			continue
+		}
+		if existing.AcceptedAt != nil {
+			return invite.Invite{}, invite.ErrInviteAlreadyAccepted
+		}
+		return existing, nil
+	}
+	return invite.Invite{}, invite.ErrInviteNotFound
+}

internal/infrastructure/useCases/inviteMail.go

@@ -0,0 +1,59 @@
+package useCases
+
+import (
+	"RenewCMS/internal/domain/hash"
+	"RenewCMS/internal/domain/invite"
+	"RenewCMS/internal/domain/mail"
+	"RenewCMS/internal/domain/user"
+	"fmt"
+	"strings"
+
+	"github.com/google/uuid"
+)
+
+const inviteTemplateName = "invitation"
+
+type MailInviteData struct {
+	Host             string
+	VerificationCode string
+	Email            string
+	InvitedBy        string
+}
+
+func (d MailInviteData) Subject() string {
+	inviter := strings.NewReplacer("\r", " ", "\n", " ").Replace(d.InvitedBy)
+	return inviter + " invited you to RenewCMS"
+}
+
+type inviteMailer struct {
+	mailRepository mail.Repository
+	publicURL      string
+}
+
+func (m inviteMailer) send(email string, rawCode string, inviter user.User) error {
+	if err := m.mailRepository.Send(email, inviteTemplateName, MailInviteData{
+		Host:             m.publicURL,
+		VerificationCode: rawCode,
+		Email:            email,
+		InvitedBy:        inviterName(inviter),
+	}); err != nil {
+		return fmt.Errorf("%w: %w", invite.ErrInviteEmailNotSent, err)
+	}
+	return nil
+}
+
+func newInviteCode(hasher hash.Hasher) (string, string, error) {
+	rawCode := uuid.NewString()
+	hashedCode, err := hasher.Hash(rawCode)
+	if err != nil {
+		return "", "", err
+	}
+	return rawCode, hashedCode, nil
+}
+
+func inviterName(inviter user.User) string {
+	if inviter.DisplayName != "" {
+		return inviter.DisplayName
+	}
+	return inviter.Username
+}