| 1 | package main |
| 2 | |
| 3 | // Pricing bands, Phase 0 (docs/pricing-bands.md): the price book's honor-band |
| 4 | // dimension, the checkout band param, Stripe Tax plumbing, and the ledger's |
| 5 | // band column. The invariant under test throughout: whatever band arrives is |
| 6 | // honoured — priced exactly as the book says, recorded exactly as bought, |
| 7 | // never silently substituted. |
| 8 | |
| 9 | import ( |
| 10 | "bytes" |
| 11 | "encoding/json" |
| 12 | "net/http" |
| 13 | "net/http/httptest" |
| 14 | "net/url" |
| 15 | "strings" |
| 16 | "testing" |
| 17 | "time" |
| 18 | ) |
| 19 | |
| 20 | // withBands gives the harness book a band dimension: friends gains reduced, |
| 21 | // business gains reduced + the business flag. family stays band-less to pin |
| 22 | // backward compatibility. |
| 23 | func withBands(s *cloudServer) { |
| 24 | for i, t := range s.billing.tiers { |
| 25 | switch t.Key { |
| 26 | case "friends": |
| 27 | s.billing.tiers[i].EUR = 4 |
| 28 | s.billing.tiers[i].NetEURYear = 44 |
| 29 | s.billing.tiers[i].Bands = map[string]billingBand{ |
| 30 | "reduced": {Label: "€2/month", Price: "price_friends_m_red", EUR: 2, NetEURYear: 21}, |
| 31 | } |
| 32 | case "business": |
| 33 | s.billing.tiers[i].Business = true |
| 34 | s.billing.tiers[i].Bands = map[string]billingBand{ |
| 35 | "reduced": {Label: "€49/month", Price: "price_business_m_red", EUR: 49}, |
| 36 | } |
| 37 | } |
| 38 | } |
| 39 | } |
| 40 | |
| 41 | // postCheckoutBand is postCheckout with an explicit band. |
| 42 | func postCheckoutBand(t *testing.T, srv *httptest.Server, token, host, requester, tier, band string) *http.Response { |
| 43 | t.Helper() |
| 44 | body, _ := json.Marshal(map[string]string{ |
| 45 | "requester": requester, |
| 46 | "tier": tier, |
| 47 | "band": band, |
| 48 | "success_url": "https://home.example.com/?upgraded=" + host, |
| 49 | "cancel_url": "https://home.example.com/", |
| 50 | }) |
| 51 | req, _ := http.NewRequest("POST", srv.URL+"/api/instances/"+host+"/checkout", bytes.NewReader(body)) |
| 52 | req.Header.Set("Authorization", "Bearer "+token) |
| 53 | resp, err := http.DefaultClient.Do(req) |
| 54 | if err != nil { |
| 55 | t.Fatal(err) |
| 56 | } |
| 57 | t.Cleanup(func() { resp.Body.Close() }) |
| 58 | return resp |
| 59 | } |
| 60 | |
| 61 | func spaceBandTier(t *testing.T, s *cloudServer, id int64) (tier, band string) { |
| 62 | t.Helper() |
| 63 | if err := s.db.sql.QueryRow(`SELECT tier, band FROM spaces WHERE id = ?`, id).Scan(&tier, &band); err != nil { |
| 64 | t.Fatal(err) |
| 65 | } |
| 66 | return tier, band |
| 67 | } |
| 68 | |
| 69 | func TestPriceBookBandValidation(t *testing.T) { |
| 70 | mk := func(book string) error { |
| 71 | _, err := newStripeBilling("sk", "whsec", book, "https://api.example.com") |
| 72 | return err |
| 73 | } |
| 74 | // A banded book parses; a band-less one still does (backward compat). |
| 75 | if err := mk(`[{"key":"family","name":"Family","label":"€5/year","price":"p1", |
| 76 | "bands":{"reduced":{"label":"€2.50/year","price":"p2"},"supporter":{"label":"€7/year","price":"p3"},"solidarity":{"label":"€1.25/year","price":"p4"}}}]`); err != nil { |
| 77 | t.Fatalf("full band set: %v", err) |
| 78 | } |
| 79 | if err := mk(`[{"key":"family","name":"Family","label":"€5/year","price":"p1"}]`); err != nil { |
| 80 | t.Fatalf("band-less book: %v", err) |
| 81 | } |
| 82 | // Unknown band names, base-as-a-band, incomplete bands, and any duplicated |
| 83 | // price id are config mistakes that must refuse to boot. |
| 84 | for name, book := range map[string]string{ |
| 85 | "unknown band": `[{"key":"f","name":"F","label":"l","price":"p1","bands":{"student":{"label":"l","price":"p2"}}}]`, |
| 86 | "base as band": `[{"key":"f","name":"F","label":"l","price":"p1","bands":{"base":{"label":"l","price":"p2"}}}]`, |
| 87 | "missing price": `[{"key":"f","name":"F","label":"l","price":"p1","bands":{"reduced":{"label":"l"}}}]`, |
| 88 | "dup price across bands": `[{"key":"f","name":"F","label":"l","price":"p1","bands":{"reduced":{"label":"l","price":"p1"}}}]`, |
| 89 | "dup price across tiers": `[{"key":"f","name":"F","label":"l","price":"p1"},{"key":"g","name":"G","label":"l","price":"p1"}]`, |
| 90 | } { |
| 91 | if err := mk(book); err == nil { |
| 92 | t.Errorf("%s: parsed, want error", name) |
| 93 | } |
| 94 | } |
| 95 | } |
| 96 | |
| 97 | func TestTierBandByPrice(t *testing.T) { |
| 98 | _, s, _ := billingTestCloud(t) |
| 99 | withBands(s) |
| 100 | if tier, band, ok := s.billing.tierBandByPrice("price_friends_m"); !ok || tier.Key != "friends" || band != "base" { |
| 101 | t.Fatalf("base price → %s/%s ok=%v", tier.Key, band, ok) |
| 102 | } |
| 103 | if tier, band, ok := s.billing.tierBandByPrice("price_friends_m_red"); !ok || tier.Key != "friends" || band != "reduced" { |
| 104 | t.Fatalf("band price → %s/%s ok=%v", tier.Key, band, ok) |
| 105 | } |
| 106 | if _, _, ok := s.billing.tierBandByPrice("price_unknown"); ok { |
| 107 | t.Fatal("unknown price resolved") |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | func TestCheckoutBand(t *testing.T) { |
| 112 | srv, s, captured := billingTestCloud(t) |
| 113 | withBands(s) |
| 114 | tok := mintCaller(t, srv, "home") |
| 115 | host, _ := decodeBody(t, createSpace(t, srv, tok, "user-1"))["host"].(string) |
| 116 | |
| 117 | // A band checkout charges the band's own Price and stamps band metadata in |
| 118 | // both routing slots. |
| 119 | if resp := postCheckoutBand(t, srv, tok, host, "user-1", "friends", "reduced"); resp.StatusCode != http.StatusOK { |
| 120 | t.Fatalf("reduced checkout: %d", resp.StatusCode) |
| 121 | } |
| 122 | f := *captured |
| 123 | if f.Get("line_items[0][price]") != "price_friends_m_red" { |
| 124 | t.Fatalf("price = %q, want the reduced band's", f.Get("line_items[0][price]")) |
| 125 | } |
| 126 | if f.Get("metadata[band]") != "reduced" || f.Get("subscription_data[metadata][band]") != "reduced" { |
| 127 | t.Fatalf("band metadata: session=%q sub=%q", f.Get("metadata[band]"), f.Get("subscription_data[metadata][band]")) |
| 128 | } |
| 129 | // Stripe Tax is an operator knob — absent until flipped. |
| 130 | if f.Has("automatic_tax[enabled]") || f.Has("tax_id_collection[enabled]") { |
| 131 | t.Fatalf("tax fields sent with the knob off: %v", f) |
| 132 | } |
| 133 | |
| 134 | // No band = base, priced and stamped as such. |
| 135 | if resp := postCheckout(t, srv, tok, host, "user-1", "friends"); resp.StatusCode != http.StatusOK { |
| 136 | t.Fatalf("base checkout: %d", resp.StatusCode) |
| 137 | } |
| 138 | f = *captured |
| 139 | if f.Get("line_items[0][price]") != "price_friends_m" || f.Get("metadata[band]") != "base" { |
| 140 | t.Fatalf("base checkout form: price=%q band=%q", f.Get("line_items[0][price]"), f.Get("metadata[band]")) |
| 141 | } |
| 142 | |
| 143 | // A band this tier doesn't offer is refused — never silently re-priced. |
| 144 | if resp := postCheckoutBand(t, srv, tok, host, "user-1", "friends", "solidarity"); resp.StatusCode != http.StatusBadRequest { |
| 145 | t.Fatalf("unoffered band: %d, want 400", resp.StatusCode) |
| 146 | } |
| 147 | // A band on a band-less tier likewise (family has none). |
| 148 | if resp := postCheckoutBand(t, srv, tok, host, "user-1", "family", "reduced"); resp.StatusCode != http.StatusBadRequest { |
| 149 | t.Fatalf("band on band-less tier: %d, want 400", resp.StatusCode) |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | func TestCheckoutStripeTax(t *testing.T) { |
| 154 | srv, s, captured := billingTestCloud(t) |
| 155 | withBands(s) |
| 156 | s.billing.automaticTax = true |
| 157 | tok := mintCaller(t, srv, "home") |
| 158 | host, _ := decodeBody(t, createSpace(t, srv, tok, "user-1"))["host"].(string) |
| 159 | |
| 160 | // Consumer tier: tax on, no VAT-ID collection. |
| 161 | if resp := postCheckout(t, srv, tok, host, "user-1", "friends"); resp.StatusCode != http.StatusOK { |
| 162 | t.Fatalf("friends checkout: %d", resp.StatusCode) |
| 163 | } |
| 164 | f := *captured |
| 165 | if f.Get("automatic_tax[enabled]") != "true" || f.Has("tax_id_collection[enabled]") { |
| 166 | t.Fatalf("consumer tax fields: %v", f) |
| 167 | } |
| 168 | // Business tier: tax on AND the VAT ID field (EU reverse charge). |
| 169 | if resp := postCheckout(t, srv, tok, host, "user-1", "business"); resp.StatusCode != http.StatusOK { |
| 170 | t.Fatalf("business checkout: %d", resp.StatusCode) |
| 171 | } |
| 172 | f = *captured |
| 173 | if f.Get("automatic_tax[enabled]") != "true" || f.Get("tax_id_collection[enabled]") != "true" { |
| 174 | t.Fatalf("business tax fields: %v", f) |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | func TestWebhookRecordsBand(t *testing.T) { |
| 179 | srv, s, _ := billingTestCloud(t) |
| 180 | withBands(s) |
| 181 | tok := mintCaller(t, srv, "home") |
| 182 | createSpace(t, srv, tok, "user-1") |
| 183 | |
| 184 | deliver := func(event string) { |
| 185 | t.Helper() |
| 186 | payload := []byte(event) |
| 187 | if r := postWebhook(t, srv, payload, stripeSign(payload, "whsec_test_secret", time.Now())); r.StatusCode != http.StatusOK { |
| 188 | t.Fatalf("webhook: %d", r.StatusCode) |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | // Checkout completion seeds tier + band from the session metadata. |
| 193 | deliver(`{"type":"checkout.session.completed","data":{"object":{ |
| 194 | "mode":"subscription","client_reference_id":"1","customer":"cus_1","subscription":"sub_1", |
| 195 | "metadata":{"tier":"friends","band":"reduced"}}}}`) |
| 196 | if tier, band := spaceBandTier(t, s, 1); tier != "friends" || band != "reduced" { |
| 197 | t.Fatalf("after checkout: %s/%s, want friends/reduced", tier, band) |
| 198 | } |
| 199 | |
| 200 | // A plan switch to another band's price moves the recorded band — the |
| 201 | // subscription's PRICE is the truth, metadata only seeded the first value. |
| 202 | deliver(`{"type":"customer.subscription.updated","data":{"object":{ |
| 203 | "id":"sub_1","status":"active","metadata":{"space_id":"1","tier":"friends","band":"reduced"}, |
| 204 | "items":{"data":[{"current_period_end":1900000000,"price":{"id":"price_friends_m"}}]}}}}`) |
| 205 | if tier, band := spaceBandTier(t, s, 1); tier != "friends" || band != "base" { |
| 206 | t.Fatalf("after switch to base price: %s/%s, want friends/base", tier, band) |
| 207 | } |
| 208 | |
| 209 | // An event without price data keeps the recorded band (COALESCE semantics). |
| 210 | deliver(`{"type":"customer.subscription.updated","data":{"object":{ |
| 211 | "id":"sub_1","status":"active","metadata":{"space_id":"1"},"current_period_end":1900000099}}}`) |
| 212 | if _, band := spaceBandTier(t, s, 1); band != "base" { |
| 213 | t.Fatalf("band lost on a price-less event: %q", band) |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | func TestPortalBandConfig(t *testing.T) { |
| 218 | // A portal fake capturing the configuration param. |
| 219 | captured := url.Values{} |
| 220 | stripe := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 221 | if r.URL.Path != "/v1/billing_portal/sessions" { |
| 222 | w.WriteHeader(http.StatusNotFound) |
| 223 | return |
| 224 | } |
| 225 | _ = r.ParseForm() |
| 226 | captured = r.PostForm |
| 227 | writeJSON(w, http.StatusOK, map[string]any{"url": "https://billing.stripe.com/p/session_x"}) |
| 228 | })) |
| 229 | defer stripe.Close() |
| 230 | |
| 231 | srv, s, _ := billingTestCloud(t) |
| 232 | withBands(s) |
| 233 | s.billing.apiBase = stripe.URL |
| 234 | s.billing.portalConfig = "bpc_default" |
| 235 | s.billing.portalConfigs = map[string]string{"reduced": "bpc_reduced"} |
| 236 | tok := mintCaller(t, srv, "home") |
| 237 | host, _ := decodeBody(t, createSpace(t, srv, tok, "user-1"))["host"].(string) |
| 238 | if err := s.db.markSpacePaid(1, "cus_1", "sub_1", "friends", "reduced"); err != nil { |
| 239 | t.Fatal(err) |
| 240 | } |
| 241 | |
| 242 | postPortal := func() { |
| 243 | t.Helper() |
| 244 | body, _ := json.Marshal(map[string]string{"requester": "user-1", "return_url": "https://home.example.com/"}) |
| 245 | req, _ := http.NewRequest("POST", srv.URL+"/api/instances/"+host+"/portal", bytes.NewReader(body)) |
| 246 | req.Header.Set("Authorization", "Bearer "+tok) |
| 247 | resp, err := http.DefaultClient.Do(req) |
| 248 | if err != nil { |
| 249 | t.Fatal(err) |
| 250 | } |
| 251 | defer resp.Body.Close() |
| 252 | if resp.StatusCode != http.StatusOK { |
| 253 | t.Fatalf("portal: %d", resp.StatusCode) |
| 254 | } |
| 255 | } |
| 256 | |
| 257 | // The reduced-band space gets the reduced portal configuration… |
| 258 | postPortal() |
| 259 | if got := captured.Get("configuration"); got != "bpc_reduced" { |
| 260 | t.Fatalf("configuration = %q, want bpc_reduced", got) |
| 261 | } |
| 262 | // …and a band without its own config falls back to the default. |
| 263 | if _, err := s.db.sql.Exec(`UPDATE spaces SET band = 'supporter' WHERE id = 1`); err != nil { |
| 264 | t.Fatal(err) |
| 265 | } |
| 266 | postPortal() |
| 267 | if got := captured.Get("configuration"); got != "bpc_default" { |
| 268 | t.Fatalf("fallback configuration = %q, want bpc_default", got) |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | func TestPublicTiersBands(t *testing.T) { |
| 273 | _, s, _ := billingTestCloud(t) |
| 274 | withBands(s) |
| 275 | out := s.billing.publicTiers() |
| 276 | var friends map[string]any |
| 277 | for _, e := range out { |
| 278 | if e["key"] == "friends" { |
| 279 | friends = e |
| 280 | } |
| 281 | } |
| 282 | if friends == nil { |
| 283 | t.Fatal("friends tier missing from listing") |
| 284 | } |
| 285 | if friends["eur"] != 4.0 { |
| 286 | t.Fatalf("eur = %v", friends["eur"]) |
| 287 | } |
| 288 | bands, _ := friends["bands"].(map[string]any) |
| 289 | red, _ := bands["reduced"].(map[string]any) |
| 290 | if red == nil || red["label"] != "€2/month" || red["eur"] != 2.0 { |
| 291 | t.Fatalf("reduced band listing = %v", red) |
| 292 | } |
| 293 | // Price ids never cross the public boundary. |
| 294 | blob, _ := json.Marshal(out) |
| 295 | if strings.Contains(string(blob), "price_") { |
| 296 | t.Fatalf("listing leaks a price id: %s", blob) |
| 297 | } |
| 298 | } |
| 299 | |
| 300 | func TestNetForTierBand(t *testing.T) { |
| 301 | _, s, _ := billingTestCloud(t) |
| 302 | withBands(s) |
| 303 | if net := s.netForTier("friends", "base", 0); net != 44 { |
| 304 | t.Fatalf("base net = %v", net) |
| 305 | } |
| 306 | if net := s.netForTier("friends", "", 0); net != 44 { |
| 307 | t.Fatalf("empty-band net = %v (pre-band rows read as base)", net) |
| 308 | } |
| 309 | if net := s.netForTier("friends", "reduced", 0); net != 21 { |
| 310 | t.Fatalf("reduced net = %v", net) |
| 311 | } |
| 312 | // A recorded band the book no longer names falls back to base, not zero. |
| 313 | if net := s.netForTier("friends", "supporter", 0); net != 44 { |
| 314 | t.Fatalf("retired-band net = %v", net) |
| 315 | } |
| 316 | } |
| 317 | |
amadan