steve
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Per-garden public read-only link: unauthenticated GET /api/v1/public/gardens/:token (no requireAuth, no OIDC), owner-only enable/rotate/disable, and a /g/$token page rendering GardenCanvas read-only. Review fixes: redact plant owner ids, Cache-Control: no-store, 400 on malformed body, shared resetTransient store action. Closes #41. Co-authored-by: Steve Dudenhoeffer <[email protected]>
87 lines
3.3 KiB
Go
87 lines
3.3 KiB
Go
// Package service is pansy's business-logic seam: all permission checks and
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// invariants live here rather than in the HTTP handlers. Resource operations
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// take (ctx, actor, args) so every rule is enforced regardless of caller; the
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// auth operations here are the exception — they establish the actor, so they
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// take credentials rather than one. REST handlers (internal/api) and, later,
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// agent tools (internal/agent) are thin adapters over these methods, so both
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// inherit the same rules. This file holds the shared plumbing; feature methods
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// live alongside it (auth.go, and gardens/objects/… in later issues).
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package service
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import (
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"crypto/rand"
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"crypto/sha256"
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"encoding/base64"
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"encoding/hex"
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"fmt"
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"time"
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"gitea.stevedudenhoeffer.com/steve/pansy/internal/config"
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"gitea.stevedudenhoeffer.com/steve/pansy/internal/store"
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)
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// timeLayout is the ISO-8601 UTC format used for every full timestamp pansy
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// stores (created_at/updated_at/expires_at). It matches the schema's
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// strftime('%Y-%m-%dT%H:%M:%SZ') so string comparison (e.g. session expiry) is
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// equivalent to time comparison. Date-only fields (planting planted_at/
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// removed_at) use dateLayout instead.
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const timeLayout = "2006-01-02T15:04:05Z"
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// sessionTTL is how long a session lives from its last use (sliding expiry).
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const sessionTTL = 30 * 24 * time.Hour
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// Service holds the dependencies shared by every operation.
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type Service struct {
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store *store.DB
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cfg *config.Config
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// now is the clock, injectable so tests can advance time (session expiry).
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now func() time.Time
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// dummyHash is a valid argon2id hash Login verifies against when an email is
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// unknown, so response time doesn't reveal whether an account exists. It is
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// produced by timingHash (fixed salt, no RNG) so it is always present — an
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// empty one would silently re-open account enumeration.
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dummyHash string
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}
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// New constructs a Service.
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func New(st *store.DB, cfg *config.Config) *Service {
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return &Service{
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store: st,
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cfg: cfg,
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now: time.Now,
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dummyHash: timingHash(),
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}
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}
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// formatTime renders a time as pansy's canonical UTC string.
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func formatTime(t time.Time) string { return t.UTC().Format(timeLayout) }
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// parseTime parses a canonical pansy timestamp.
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func parseTime(s string) (time.Time, error) { return time.Parse(timeLayout, s) }
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// randToken returns nBytes of cryptographic randomness as a URL-safe string.
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func randToken(nBytes int) (string, error) {
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b := make([]byte, nBytes)
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if _, err := rand.Read(b); err != nil {
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return "", fmt.Errorf("service: generate token: %w", err)
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}
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return base64.RawURLEncoding.EncodeToString(b), nil
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}
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// newSessionToken returns a fresh URL-safe random bearer token (32 bytes of
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// entropy). The raw token goes in the cookie; only its hash is persisted.
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func newSessionToken() (string, error) { return randToken(32) }
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// newPublicToken returns a fresh unguessable token for a garden's public share
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// link (18 bytes → 144 bits; a 24-char URL segment). Unlike a session token it's
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// stored raw (it must be shown back to the owner to copy) and grants only
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// read-only access to one garden.
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func newPublicToken() (string, error) { return randToken(18) }
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// hashToken maps a raw bearer token to the hex sha256 stored as the session's
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// primary key.
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func hashToken(raw string) string {
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sum := sha256.Sum256([]byte(raw))
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return hex.EncodeToString(sum[:])
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}
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