143 lines
4.4 KiB
Go
143 lines
4.4 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, avatar URL, and/or handle.
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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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// `handle` is normalized to the project's slug format before being passed
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// to the DB so users can't sneak in spaces or punctuation. Empty after
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// normalization → 400.
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func (s *UserService) UpdateProfile(ctx context.Context, id string, name, avatarURL, handle *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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if handle != nil {
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clean := normalizeHandle(*handle)
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if len(clean) < 3 {
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return nil, errors.New("handle must be at least 3 characters (letters, digits, dashes)")
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}
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if len(clean) > 32 {
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return nil, errors.New("handle too long (max 32)")
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}
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handle = &clean
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}
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return s.users.UpdateProfile(ctx, id, name, avatarURL, handle)
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}
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// GetReadingPrefs returns the user's reading prefs blob (opaque JSON).
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// Used by the frontend to hydrate ReadingSettings on sign-in so the
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// theme/palette/font choices roam across devices.
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func (s *UserService) GetReadingPrefs(ctx context.Context, id string) ([]byte, error) {
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return s.users.GetReadingPrefs(ctx, id)
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}
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// UpdateReadingPrefs overwrites the user's reading prefs blob. The
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// handler re-marshals the decoded request before calling in here so we
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// know `prefsJSON` is well-formed by the time it hits the DB.
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func (s *UserService) UpdateReadingPrefs(ctx context.Context, id string, prefsJSON []byte) error {
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return s.users.UpdateReadingPrefs(ctx, id, prefsJSON)
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}
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// normalizeHandle lowercases and strips anything that isn't [a-z0-9-]. Same
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// rules as slugForHandle in auth_service, but exposed here because the
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// profile-update path doesn't go through auth.
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func normalizeHandle(raw string) string {
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var b strings.Builder
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for _, r := range strings.ToLower(strings.TrimSpace(raw)) {
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switch {
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case r >= 'a' && r <= 'z', r >= '0' && r <= '9':
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b.WriteRune(r)
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case r == '-', r == '.', r == '_':
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b.WriteByte('-')
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}
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}
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out := strings.Trim(b.String(), "-")
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// Collapse runs of dashes.
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for strings.Contains(out, "--") {
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out = strings.ReplaceAll(out, "--", "-")
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}
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return out
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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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