Files
deklarix/internal/evidence/tsa_test.go
noroot db373e51ce feat: add PDF dossier generation (internal/dossier)
Content assembly (BuildContent) is separate from PDF drawing (Render),
so the actual business logic — what goes into the evidence dossier, in
what form, with which mandatory fields — is unit-testable without
parsing PDF bytes. BuildContent refuses to produce a dossier missing
its evidentiary fields (timestamp token, asset/metadata hash, platform)
rather than emitting one with silently empty proof sections. Every
dossier carries the "this is not legal advice" disclaimer required by
CLAUDE.md's guardrails.

Uses github.com/go-pdf/fpdf (actively maintained fork of jung-kurt/
gofpdf, no dependencies beyond the Go stdlib) for rendering. Its core
fonts use cp1252 internally, so a small cp1252.map (copied from the
fpdf module, embedded via go:embed) drives UnicodeTranslator — German
umlauts render correctly without needing an external font file at
runtime, keeping Deklarix a single binary. Verified visually with
pdftotext/pdfinfo against a generated sample.

Tests build a real, structurally valid RFC-3161 token offline (a
throwaway self-signed cert + timestamp.Timestamp.CreateResponse), so
BuildContent/Render/Generate are fully tested without hitting a real
TSA — unlike the network-gated integration test in internal/evidence.

Also adds evidence.TimestampTime(), extracted from the parsing logic
already used by the TSA client, since the dossier needs to show the
timestamped time to a human reader.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
2026-08-27 14:18:01 +02:00

143 lines
4.3 KiB
Go

package evidence_test
import (
"bytes"
"context"
"io"
"net/http"
"net/http/httptest"
"os"
"testing"
"github.com/digitorus/timestamp"
"github.com/netcell-it/deklarix/internal/evidence"
)
func TestTimestampRejectsWrongHashSize(t *testing.T) {
called := false
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
called = true
}))
defer server.Close()
ts := evidence.NewHTTPTimestamper(server.URL)
_, err := ts.Timestamp(context.Background(), []byte("zu kurz"))
if err == nil {
t.Fatal("expected error for a non-SHA-256-sized hash, got nil")
}
if called {
t.Fatal("expected no HTTP call for an invalid hash size")
}
}
// TestTimestampSendsValidRequest prüft serverseitig, dass Timestamp()
// einen tatsächlich gültigen, RFC-3161-konformen Request schickt (parsbar,
// korrekter Hash, korrekter Algorithmus, Nonce gesetzt) — ohne dafür eine
// echte signierte Antwort fälschen zu müssen.
func TestTimestampSendsValidRequest(t *testing.T) {
hash := evidence.HashBytes([]byte("test-content"))
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if ct := r.Header.Get("Content-Type"); ct != "application/timestamp-query" {
t.Errorf("Content-Type = %q, want application/timestamp-query", ct)
}
body, err := io.ReadAll(r.Body)
if err != nil {
t.Errorf("read request body: %v", err)
}
req, err := timestamp.ParseRequest(body)
if err != nil {
t.Errorf("ParseRequest: %v", err)
w.WriteHeader(http.StatusBadRequest)
return
}
if !bytes.Equal(req.HashedMessage, hash) {
t.Errorf("HashedMessage = %x, want %x", req.HashedMessage, hash)
}
if req.Nonce == nil {
t.Error("expected a nonce to be set on the request")
}
// Keine echte TSA hier — nur die Request-Validierung interessiert
// dieser Test. Ein absichtlich ungültiger Response-Body lässt
// Timestamp() mit einem Parse-Fehler zurückkommen, was für diesen
// Test in Ordnung ist.
w.WriteHeader(http.StatusOK)
w.Write([]byte("not a valid timestamp response"))
}))
defer server.Close()
ts := evidence.NewHTTPTimestamper(server.URL)
_, err := ts.Timestamp(context.Background(), hash)
if err == nil {
t.Fatal("expected a parse error for the fake response, got nil")
}
}
func TestTimestampRejectsNon200(t *testing.T) {
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusInternalServerError)
w.Write([]byte("tsa down"))
}))
defer server.Close()
ts := evidence.NewHTTPTimestamper(server.URL)
hash := evidence.HashBytes([]byte("x"))
if _, err := ts.Timestamp(context.Background(), hash); err == nil {
t.Fatal("expected error for non-200 TSA status, got nil")
}
}
func TestTimestampRejectsMalformedResponse(t *testing.T) {
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
w.WriteHeader(http.StatusOK)
w.Write([]byte("garbage, not ASN.1 DER"))
}))
defer server.Close()
ts := evidence.NewHTTPTimestamper(server.URL)
hash := evidence.HashBytes([]byte("x"))
if _, err := ts.Timestamp(context.Background(), hash); err == nil {
t.Fatal("expected error for malformed TSA response, got nil")
}
}
// TestTimestampIntegration ruft die echte Standard-TSA (FreeTSA.org) auf.
// Läuft nur, wenn DEKLARIX_TSA_INTEGRATION gesetzt ist — kein Netzwerkzugriff
// in normalen Testläufen (siehe internal/store für dasselbe Muster mit
// DATABASE_URL).
func TestTimestampIntegration(t *testing.T) {
if os.Getenv("DEKLARIX_TSA_INTEGRATION") == "" {
t.Skip("DEKLARIX_TSA_INTEGRATION nicht gesetzt, überspringe echten TSA-Aufruf")
}
hash := evidence.HashBytes([]byte(t.Name()))
ts := evidence.NewHTTPTimestamper("")
token, err := ts.Timestamp(context.Background(), hash)
if err != nil {
t.Fatalf("Timestamp: %v", err)
}
parsed, err := timestamp.Parse(token)
if err != nil {
t.Fatalf("Parse(token): %v", err)
}
if !bytes.Equal(parsed.HashedMessage, hash) {
t.Fatalf("token hash = %x, want %x", parsed.HashedMessage, hash)
}
if parsed.Time.IsZero() {
t.Fatal("expected a non-zero timestamp time")
}
tm, err := evidence.TimestampTime(token)
if err != nil {
t.Fatalf("TimestampTime: %v", err)
}
if !tm.Equal(parsed.Time) {
t.Fatalf("TimestampTime() = %v, want %v", tm, parsed.Time)
}
}