98 lines
2.8 KiB
Go
98 lines
2.8 KiB
Go
package service
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import (
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"context"
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"crypto/rand"
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"encoding/hex"
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"errors"
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"fmt"
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"path"
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"strings"
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"time"
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"github.com/prabhupadasays/spsays-bff/internal/model"
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"github.com/prabhupadasays/spsays-bff/internal/repository"
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)
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// UserService handles profile-edit + avatar-upload flows.
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type UserService struct {
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users *repository.UserRepo
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r2 *repository.R2
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}
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func NewUserService(users *repository.UserRepo, r2 *repository.R2) *UserService {
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return &UserService{users: users, r2: r2}
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}
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// UpdateProfile updates the user's name and/or avatar URL.
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//
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// `avatarURL` semantics:
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//
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// nil → don't touch
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// "" → clear (remove avatar)
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// "x" → set to "x"
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//
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// The avatar URL is expected to point at our R2 bucket — we don't validate
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// the host because we don't want to break tests / local setups, but in
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// production you could add a check that it starts with R2_PUBLIC_URL.
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func (s *UserService) UpdateProfile(ctx context.Context, id string, name *string, avatarURL *string) (*model.User, error) {
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if name != nil {
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trimmed := strings.TrimSpace(*name)
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if trimmed == "" {
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return nil, errors.New("name cannot be empty")
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}
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if len(trimmed) > 120 {
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return nil, errors.New("name too long (max 120)")
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}
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name = &trimmed
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}
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return s.users.UpdateProfile(ctx, id, name, avatarURL)
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}
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// AvatarPresign issues a one-shot presigned PUT URL the frontend uses to
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// upload an avatar directly to R2.
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//
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// The key is namespaced under `avatars/<user_id>/<random>.<ext>` so:
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// - we can list / clean up a user's avatars with one prefix scan
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// - the random suffix forces cache invalidation when the avatar changes
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// - a malicious user can't overwrite someone else's avatar (their JWT
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// scopes the user_id portion of the key)
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//
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// Returns (uploadURL, publicURL, error). The frontend then PUTs to uploadURL
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// and POSTs publicURL back as the new avatar.
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func (s *UserService) AvatarPresign(ctx context.Context, userID, contentType string) (uploadURL, publicURL string, err error) {
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if s.r2 == nil {
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return "", "", errors.New("avatar uploads are not configured")
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}
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ext, ok := extensionFor(contentType)
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if !ok {
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return "", "", fmt.Errorf("unsupported content type: %s", contentType)
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}
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suffix := make([]byte, 8)
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if _, err := rand.Read(suffix); err != nil {
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return "", "", err
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}
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key := path.Join("avatars", userID, hex.EncodeToString(suffix)+ext)
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return s.r2.PresignPut(ctx, key, contentType, 5*time.Minute)
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}
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// extensionFor whitelists the image content types we accept. Restricting
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// here is the cheap-but-effective defence against users uploading arbitrary
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// binaries to our R2 bucket.
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func extensionFor(ct string) (string, bool) {
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switch ct {
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case "image/png":
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return ".png", true
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case "image/jpeg":
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return ".jpg", true
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case "image/webp":
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return ".webp", true
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case "image/gif":
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return ".gif", true
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default:
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return "", false
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}
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}
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