feat: custom stickers apis

internal/handler/sadhna.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"errors"
 	"net/http"
+	"strings"
 	"time"
 
 	"github.com/go-chi/chi/v5"
@@ -140,6 +141,48 @@ func (h *SadhnaHandler) GiftableRewards(w http.ResponseWriter, r *http.Request)
 	response.JSON(w, http.StatusOK, list)
 }
 
+type customGiftReq struct {
+	Name     string `json:"name"`
+	Meaning  string `json:"meaning"`
+	ImageURL string `json:"image_url"`
+}
+
+// CreateCustomGift — POST /admin/reward-gifts/catalog
+//
+// Adds a sticker to the catalog. It reaches nobody until it is sent.
+func (h *SadhnaHandler) CreateCustomGift(w http.ResponseWriter, r *http.Request) {
+	var req customGiftReq
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		response.Error(w, http.StatusBadRequest, "invalid JSON body")
+		return
+	}
+	reward, err := h.svc.CreateCustomGift(r.Context(), req.Name, req.Meaning, req.ImageURL)
+	if err != nil {
+		response.Error(w, http.StatusBadRequest, err.Error())
+		return
+	}
+	response.JSON(w, http.StatusCreated, reward)
+}
+
+// PresignGiftImage — POST /admin/reward-gifts/image-presign
+func (h *SadhnaHandler) PresignGiftImage(w http.ResponseWriter, r *http.Request) {
+	var req struct {
+		ContentType string `json:"content_type"`
+	}
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		response.Error(w, http.StatusBadRequest, "invalid JSON body")
+		return
+	}
+	upload, public, err := h.svc.PresignGiftImage(r.Context(), strings.TrimSpace(req.ContentType))
+	if err != nil {
+		response.Error(w, http.StatusBadRequest, err.Error())
+		return
+	}
+	response.JSON(w, http.StatusOK, map[string]string{
+		"upload_url": upload, "image_url": public,
+	})
+}
+
 type giftReq struct {
 	RewardKey string `json:"reward_key"`
 }

internal/repository/sadhna_reward_repo.go

@@ -187,6 +187,25 @@ func (r *RewardRepo) CreateGrant(ctx context.Context, userID, rewardID string, m
 	return nil
 }
 
+// CreateCustom adds a reward to the catalog from the admin panel.
+//
+// Custom entries survive re-seeding: Seed upserts only the keys in its
+// embedded JSON, and these keys are namespaced away from those.
+func (r *RewardRepo) CreateCustom(ctx context.Context, key, name, meaning, imageURL string) (*model.SadhnaReward, error) {
+	var w model.SadhnaReward
+	err := r.pg.Pool.QueryRow(ctx, `
+		INSERT INTO sadhna_rewards (key, name, meaning, image_url, active, sort)
+		-- Sorted after the seeded catalog so custom gifts don't reshuffle it.
+		VALUES ($1, $2, $3, $4, true, 1000)
+		RETURNING id, key, name, meaning, image_url, active, sort`,
+		key, name, meaning, imageURL,
+	).Scan(&w.ID, &w.Key, &w.Name, &w.Meaning, &w.ImageURL, &w.Active, &w.Sort)
+	if err != nil {
+		return nil, fmt.Errorf("create custom reward: %w", err)
+	}
+	return &w, nil
+}
+
 // ByKey looks up one reward from the catalog.
 func (r *RewardRepo) ByKey(ctx context.Context, key string) (*model.SadhnaReward, error) {
 	var w model.SadhnaReward

internal/server/server.go

@@ -327,7 +327,7 @@ func (s *Server) initAuth(cfg *config.Config, logger *zap.Logger) {
 	if err := rewardRepo.Seed(context.Background()); err != nil {
 		logger.Warn("sadhna: could not seed reward catalog", zap.Error(err))
 	}
-	sadhnaSvc := service.NewSadhnaService(sadhnaRepo, postRepo, userRepo, rewardRepo, logger)
+	sadhnaSvc := service.NewSadhnaService(sadhnaRepo, postRepo, userRepo, rewardRepo, r2, logger)
 	s.sadhnaH = handler.NewSadhnaHandler(sadhnaSvc)
 
 	// Feedback + stats — share Postgres with the rest of /api/v1 and
@@ -1163,6 +1163,8 @@ func (s *Server) setupRouter() {
 			// Announcements composed and published from the admin panel.
 			r.Get("/reward-gifts/catalog", s.sadhnaH.GiftableRewards)
 			r.Post("/reward-gifts", s.sadhnaH.GiftToEveryone)
+			r.Post("/reward-gifts/catalog", s.sadhnaH.CreateCustomGift)
+			r.Post("/reward-gifts/image-presign", s.sadhnaH.PresignGiftImage)
 
 			r.Get("/broadcasts", s.broadcastH.List)
 			r.Post("/broadcasts", s.broadcastH.Create)

internal/service/broadcast_service.go

@@ -223,7 +223,9 @@ func (s *BroadcastService) PresignBanner(ctx context.Context, contentType string
 	if !ok || kind != model.AttachmentImage {
 		return "", "", ErrChatBadMedia
 	}
-	return presignImage(ctx, s.r2, strings.TrimSuffix(bannerPrefix, "/"), "banner", contentType)
+	// Returns the KEY: broadcasts.banner_key stores a key, and withBanner
+	// builds the URL from it at read time.
+	return presignImageKey(ctx, s.r2, strings.TrimSuffix(bannerPrefix, "/"), "banner", contentType)
 }
 
 func (s *BroadcastService) withBanner(b *model.Broadcast, key *string) {

internal/service/sadhna_service.go

@@ -16,7 +16,12 @@ package service
 
 import (
 	"context"
+	crand "crypto/rand"
+	"encoding/hex"
+	"errors"
 	"math/rand"
+	"regexp"
+	"strings"
 	"time"
 
 	"github.com/prabhupadasays/spsays-bff/internal/model"
@@ -64,6 +69,9 @@ type SadhnaService struct {
 	posts   *repository.PostRepo
 	users   *repository.UserRepo
 	rewards *repository.RewardRepo
+	// r2 stores custom gift artwork. Optional: nil disables custom gifts
+	// rather than failing anything that already works.
+	r2     *repository.R2
 	logger *zap.Logger
 }
 
@@ -72,9 +80,13 @@ func NewSadhnaService(
 	posts *repository.PostRepo,
 	users *repository.UserRepo,
 	rewards *repository.RewardRepo,
+	r2 *repository.R2,
 	logger *zap.Logger,
 ) *SadhnaService {
-	return &SadhnaService{logs: logs, posts: posts, users: users, rewards: rewards, logger: logger}
+	return &SadhnaService{
+		logs: logs, posts: posts, users: users, rewards: rewards,
+		r2: r2, logger: logger,
+	}
 }
 
 const dayFmt = "2006-01-02"
@@ -415,6 +427,57 @@ func (s *SadhnaService) GiftToEveryone(ctx context.Context, rewardKey string) (i
 	return s.rewards.GrantGiftToEveryone(ctx, reward.ID)
 }
 
+// customKeyPrefix namespaces admin-made rewards away from the seeded catalog,
+// so Seed can never collide with one.
+const customKeyPrefix = "custom_"
+
+var nonSlug = regexp.MustCompile(`[^a-z0-9]+`)
+
+// customRewardKey derives a stable, unique key from a name.
+//
+// The random suffix is what makes it unique: two gifts may reasonably share a
+// name, and a collision would overwrite the first one's artwork.
+func customRewardKey(name string) (string, error) {
+	slug := strings.Trim(nonSlug.ReplaceAllString(strings.ToLower(name), "_"), "_")
+	if slug == "" {
+		slug = "gift"
+	}
+	if len(slug) > 32 {
+		slug = slug[:32]
+	}
+	suffix := make([]byte, 4)
+	if _, err := crand.Read(suffix); err != nil {
+		return "", err
+	}
+	return customKeyPrefix + slug + "_" + hex.EncodeToString(suffix), nil
+}
+
+// CreateCustomGift adds a new sticker to the catalog. It is not granted to
+// anyone until it is sent.
+func (s *SadhnaService) CreateCustomGift(ctx context.Context, name, meaning, imageURL string) (*model.SadhnaReward, error) {
+	name = strings.TrimSpace(name)
+	if name == "" {
+		return nil, errors.New("a gift needs a name")
+	}
+	if strings.TrimSpace(imageURL) == "" {
+		return nil, errors.New("a gift needs an image")
+	}
+	key, err := customRewardKey(name)
+	if err != nil {
+		return nil, err
+	}
+	return s.rewards.CreateCustom(ctx, key, name, strings.TrimSpace(meaning), imageURL)
+}
+
+// PresignGiftImage issues an upload URL for custom sticker artwork.
+//
+// Returns the PUBLIC URL, not a key: sadhna_rewards.image_url stores an
+// absolute address, and stickers render for every participant in a chat, so
+// the artwork belongs in the public bucket alongside avatars and post images.
+func (s *SadhnaService) PresignGiftImage(ctx context.Context, contentType string) (uploadURL, publicURL string, err error) {
+	return presignImage(ctx, s.r2, "reward-gifts", "custom", contentType)
+}
+
 // GiftableRewards is the catalog an admin picks from.
 func (s *SadhnaService) GiftableRewards(ctx context.Context) ([]model.SadhnaReward, error) {
 	return s.rewards.ListGiftable(ctx)

internal/service/social_service.go

@@ -775,6 +775,29 @@ func (s *CollectionService) CoverPresign(ctx context.Context, userID, contentTyp
 // presignImage builds an R2 presign for a user-scoped media key under the
 // given prefix. The random suffix invalidates browser caches when the image
 // is replaced.
+// presignImageKey is presignImage's sibling for callers that store the storage
+// KEY rather than a URL — so the CDN domain can change without rewriting rows.
+// Handing those callers a public URL silently doubles it at read time.
+func presignImageKey(ctx context.Context, r2 *repository.R2, prefix, name, contentType string) (uploadURL, key string, err error) {
+	if r2 == nil {
+		return "", "", errors.New("media uploads are not configured")
+	}
+	ext, ok := imageExtensionFor(contentType)
+	if !ok {
+		return "", "", fmt.Errorf("unsupported content type: %s", contentType)
+	}
+	suffix := make([]byte, 8)
+	if _, err := rand.Read(suffix); err != nil {
+		return "", "", err
+	}
+	key = path.Join(prefix, name, hex.EncodeToString(suffix)+ext)
+	uploadURL, _, err = r2.PresignPut(ctx, key, contentType, 5*time.Minute)
+	if err != nil {
+		return "", "", err
+	}
+	return uploadURL, key, nil
+}
+
 func presignImage(ctx context.Context, r2 *repository.R2, prefix, userID, contentType string) (uploadURL, publicURL string, err error) {
 	if r2 == nil {
 		return "", "", errors.New("media uploads are not configured")