| 1 | //! Stripe telling billing what happened, and enterprise invoices. |
| 2 | //! |
| 3 | //! Most of billing asks Stripe when it needs to know: a payment page is |
| 4 | //! confirmed when the person comes back, a plan is checked when its period |
| 5 | //! ends. That misses whatever happens while no one is looking: a page paid |
| 6 | //! for and closed, a renewal that failed, a refund, a dispute, an invoice |
| 7 | //! paid by bank transfer a week later. Stripe sends each as an event to |
| 8 | //! `https://api.g1t.sh/stripe/webhook`; the API passes the raw body and its |
| 9 | //! signature here, untouched. |
| 10 | //! |
| 11 | //! - The endpoint is registered by billing itself, from sudo, once per |
| 12 | //! mode, and its signing secret is kept in billing's database. It is never |
| 13 | //! shown, and nothing can be posted here without it. |
| 14 | //! - Each event is handled once, by id, and recorded with what was done. |
| 15 | //! - Every handler is safe alongside the paths that ask Stripe directly: |
| 16 | //! both claim the same rows. |
| 17 | //! |
| 18 | //! Enterprises are invoiced: one Stripe invoice per month (or sooner, from |
| 19 | //! sudo), with a line per workspace for what it owes, sent to the |
| 20 | //! enterprise's billing email and paid on Stripe's hosted invoice page. |
| 21 | //! When it is paid, each workspace is credited its line; when it goes |
| 22 | //! overdue, their work stops until it is paid. |
| 23 | |
| 24 | use g1t_contracts::billing::{ |
| 25 | AdminEnterpriseBillingArgs, AdminInvoiceEnterpriseArgs, AdminStripeArgs, BillingAccount, EnterpriseInvoice, |
| 26 | EntryKind, InvoiceLine, StripeEventSummary, StripeStatus, StripeWebhook, StripeWebhookArgs, |
| 27 | }; |
| 28 | use g1t_contracts::time::rfc3339; |
| 29 | use g1t_contracts::{FailureCode, Outcome}; |
| 30 | use g1t_kit::now_ms; |
| 31 | use hmac::{Hmac, Mac}; |
| 32 | use serde::Deserialize; |
| 33 | use serde_json::Value; |
| 34 | use sha2::Sha256; |
| 35 | use worker::Result; |
| 36 | use worker::wasm_bindgen::JsValue; |
| 37 | |
| 38 | use crate::Billing; |
| 39 | |
| 40 | /// Where Stripe sends events. |
| 41 | pub(crate) const WEBHOOK_URL: &str = "https://api.g1t.sh/stripe/webhook"; |
| 42 | |
| 43 | /// The events billing acts on. |
| 44 | pub(crate) const EVENTS: &[&str] = &[ |
| 45 | "checkout.session.completed", |
| 46 | // A prepayment by bank transfer: the page completes when the transfer |
| 47 | // is set up, and this comes when the money arrives. |
| 48 | "checkout.session.async_payment_succeeded", |
| 49 | "customer.subscription.updated", |
| 50 | "customer.subscription.deleted", |
| 51 | "invoice.paid", |
| 52 | "invoice.payment_failed", |
| 53 | "invoice.overdue", |
| 54 | "invoice.voided", |
| 55 | "charge.refunded", |
| 56 | "charge.dispute.created", |
| 57 | "charge.dispute.closed", |
| 58 | // The saved card, kept on the account row (stripe_sync.rs). |
| 59 | "customer.updated", |
| 60 | "payment_method.attached", |
| 61 | "payment_method.detached", |
| 62 | "payment_method.updated", |
| 63 | "payment_method.automatically_updated", |
| 64 | "setup_intent.succeeded", |
| 65 | ]; |
| 66 | |
| 67 | /// Events billing handles that `has` does not include, in billing's order. |
| 68 | pub(crate) fn missing_events(has: &[String]) -> Vec<String> { |
| 69 | // `*` is every event. |
| 70 | if has.iter().any(|event| event == "*") { |
| 71 | return Vec::new(); |
| 72 | } |
| 73 | EVENTS.iter().filter(|event| !has.iter().any(|h| h == *event)).map(|event| (*event).to_owned()).collect() |
| 74 | } |
| 75 | |
| 76 | /// How old a signed event may be, so a captured one cannot be replayed. |
| 77 | const TOLERANCE_SECONDS: i64 = 5 * 60; |
| 78 | |
| 79 | /// Whether `header` (`t=…,v1=…`) signs `payload` with `secret`, within the |
| 80 | /// tolerance of `now_seconds`. |
| 81 | pub(crate) fn verify(payload: &str, header: &str, secret: &str, now_seconds: i64) -> bool { |
| 82 | let mut timestamp = None; |
| 83 | let mut signatures = vec![]; |
| 84 | for part in header.split(',') { |
| 85 | match part.trim().split_once('=') { |
| 86 | Some(("t", value)) => timestamp = value.parse::<i64>().ok(), |
| 87 | Some(("v1", value)) => signatures.push(value.to_owned()), |
| 88 | _ => {} |
| 89 | } |
| 90 | } |
| 91 | let Some(timestamp) = timestamp else { return false }; |
| 92 | if (now_seconds - timestamp).abs() > TOLERANCE_SECONDS { |
| 93 | return false; |
| 94 | } |
| 95 | let Ok(mut mac) = Hmac::<Sha256>::new_from_slice(secret.as_bytes()) else { return false }; |
| 96 | mac.update(format!("{timestamp}.{payload}").as_bytes()); |
| 97 | let expected = mac.finalize().into_bytes(); |
| 98 | signatures.iter().any(|signature| { |
| 99 | hex::decode(signature).is_ok_and(|given| { |
| 100 | // Constant time: compare every byte whatever the first difference. |
| 101 | given.len() == expected.len() && given.iter().zip(expected.iter()).fold(0u8, |acc, (a, b)| acc | (a ^ b)) == 0 |
| 102 | }) |
| 103 | }) |
| 104 | } |
| 105 | |
| 106 | /// The destination at billing's address, as Stripe lists it. |
| 107 | #[derive(Deserialize)] |
| 108 | pub(crate) struct Destination { |
| 109 | pub(crate) id: String, |
| 110 | url: String, |
| 111 | /// `enabled` or `disabled`. |
| 112 | pub(crate) status: String, |
| 113 | pub(crate) enabled_events: Vec<String>, |
| 114 | created: i64, |
| 115 | } |
| 116 | |
| 117 | #[derive(Deserialize)] |
| 118 | struct EventRow { |
| 119 | id: String, |
| 120 | r#type: String, |
| 121 | outcome: String, |
| 122 | received_at: String, |
| 123 | } |
| 124 | |
| 125 | #[derive(Deserialize)] |
| 126 | struct InvoiceRow { |
| 127 | invoice_id: String, |
| 128 | period: String, |
| 129 | amount_micros: i64, |
| 130 | status: String, |
| 131 | hosted_url: Option<String>, |
| 132 | created_at: String, |
| 133 | } |
| 134 | |
| 135 | #[derive(Deserialize)] |
| 136 | struct LineRow { |
| 137 | workspace: String, |
| 138 | amount_micros: i64, |
| 139 | } |
| 140 | |
| 141 | impl Billing { |
| 142 | pub(crate) fn mode(&self) -> &'static str { |
| 143 | match &self.stripe { |
| 144 | None => "off", |
| 145 | Some(stripe) if stripe.live() => "live", |
| 146 | Some(_) => "test", |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | /// The destination at billing's address in Stripe, for this key's |
| 151 | /// mode: an enabled one first. None when there is none. |
| 152 | pub(crate) async fn destination(&self) -> Result<Option<Destination>> { |
| 153 | let Some(stripe) = &self.stripe else { return Ok(None) }; |
| 154 | #[derive(Deserialize)] |
| 155 | struct List { |
| 156 | data: Vec<Destination>, |
| 157 | } |
| 158 | let mut ours: Vec<Destination> = |
| 159 | stripe.get::<List>("/webhook_endpoints?limit=100").await?.data.into_iter().filter(|d| d.url == WEBHOOK_URL).collect(); |
| 160 | ours.sort_by_key(|d| d.status != "enabled"); |
| 161 | Ok(ours.into_iter().next()) |
| 162 | } |
| 163 | |
| 164 | // --- Staff ------------------------------------------------------------ |
| 165 | |
| 166 | pub(crate) async fn admin_stripe(&self, a: AdminStripeArgs) -> Result<StripeStatus> { |
| 167 | let mut error = None; |
| 168 | if a.fix |
| 169 | && let Err(e) = self.keep_endpoint(a.by.as_deref().unwrap_or("sudo")).await |
| 170 | { |
| 171 | error = Some(e.to_string()); |
| 172 | } |
| 173 | let (webhook, missing_events) = match self.destination().await { |
| 174 | Ok(Some(d)) => { |
| 175 | let missing = missing_events(&d.enabled_events); |
| 176 | let webhook = StripeWebhook { |
| 177 | url: d.url, |
| 178 | endpoint_id: d.id, |
| 179 | status: d.status, |
| 180 | events: d.enabled_events, |
| 181 | created_at: rfc3339(d.created.max(0) as u64 * 1000), |
| 182 | }; |
| 183 | (Some(webhook), missing) |
| 184 | } |
| 185 | Ok(None) => (None, Vec::new()), |
| 186 | Err(e) => { |
| 187 | error = error.or(Some(format!("Stripe could not be read: {e}"))); |
| 188 | (None, Vec::new()) |
| 189 | } |
| 190 | }; |
| 191 | let recent_events = self |
| 192 | .db |
| 193 | .prepare("SELECT * FROM stripe_events ORDER BY received_at DESC LIMIT 25") |
| 194 | .all() |
| 195 | .await? |
| 196 | .results::<EventRow>()? |
| 197 | .into_iter() |
| 198 | .map(|row| StripeEventSummary { id: row.id, kind: row.r#type, outcome: row.outcome, received_at: row.received_at }) |
| 199 | .collect(); |
| 200 | Ok(StripeStatus { |
| 201 | mode: self.mode().to_owned(), |
| 202 | secret_set: self.webhook_secret.is_some(), |
| 203 | webhook, |
| 204 | missing_events, |
| 205 | recent_events, |
| 206 | error, |
| 207 | }) |
| 208 | } |
| 209 | |
| 210 | // --- Events ----------------------------------------------------------- |
| 211 | |
| 212 | pub(crate) async fn stripe_webhook(&self, a: StripeWebhookArgs) -> Result<Outcome<bool>> { |
| 213 | let Some(secret) = &self.webhook_secret else { |
| 214 | return Ok(Outcome::fail( |
| 215 | FailureCode::Conflict, |
| 216 | "STRIPE_WEBHOOK_SECRET is not set, so billing cannot check that events come from Stripe.", |
| 217 | )); |
| 218 | }; |
| 219 | let now_seconds = (now_ms() / 1000) as i64; |
| 220 | if !verify(&a.payload, &a.signature, secret, now_seconds) { |
| 221 | return Ok(Outcome::fail(FailureCode::Forbidden, "The signature does not match.")); |
| 222 | } |
| 223 | let event: Value = serde_json::from_str(&a.payload).map_err(|e| worker::Error::RustError(e.to_string()))?; |
| 224 | if event["id"].as_str().unwrap_or_default().is_empty() { |
| 225 | return Ok(Outcome::fail(FailureCode::Invalid, "Not an event.")); |
| 226 | } |
| 227 | Ok(Outcome::Ok(self.process_event(&event).await?)) |
| 228 | } |
| 229 | |
| 230 | /// Handles a Stripe event once, however often it arrives: by webhook, |
| 231 | /// or again from the event list (stripe_sync.rs). False when it was |
| 232 | /// seen before. |
| 233 | pub(crate) async fn process_event(&self, event: &Value) -> Result<bool> { |
| 234 | let id = event["id"].as_str().unwrap_or_default().to_owned(); |
| 235 | let kind = event["type"].as_str().unwrap_or_default().to_owned(); |
| 236 | // Once each: the first to record it handles it. |
| 237 | let claimed = self |
| 238 | .db |
| 239 | .prepare("INSERT OR IGNORE INTO stripe_events (id, type, outcome, received_at) VALUES (?, ?, 'handling', ?) RETURNING id") |
| 240 | .bind(&[id.as_str().into(), kind.as_str().into(), rfc3339(now_ms()).into()])? |
| 241 | .first::<Value>(None) |
| 242 | .await?; |
| 243 | if claimed.is_none() { |
| 244 | return Ok(false); |
| 245 | } |
| 246 | let outcome = match self.handle(&kind, event).await { |
| 247 | Ok(outcome) => outcome, |
| 248 | Err(error) => { |
| 249 | // Let Stripe send it again: forget it was seen. |
| 250 | self.db.prepare("DELETE FROM stripe_events WHERE id = ?").bind(&[id.as_str().into()])?.run().await?; |
| 251 | return Err(error); |
| 252 | } |
| 253 | }; |
| 254 | self.db |
| 255 | .prepare("UPDATE stripe_events SET outcome = ? WHERE id = ?") |
| 256 | .bind(&[outcome.as_str().into(), id.as_str().into()])? |
| 257 | .run() |
| 258 | .await?; |
| 259 | Ok(true) |
| 260 | } |
| 261 | |
| 262 | async fn handle(&self, kind: &str, event: &Value) -> Result<String> { |
| 263 | let object = &event["data"]["object"]; |
| 264 | let text = |key: &str| object[key].as_str().unwrap_or_default().to_owned(); |
| 265 | // The customer whose saved card may have changed. A detached card |
| 266 | // has no customer any more; the event says whose it was. |
| 267 | let card_owner = match kind { |
| 268 | "customer.updated" => object["id"].as_str(), |
| 269 | "payment_method.detached" => event["data"]["previous_attributes"]["customer"].as_str(), |
| 270 | _ => object["customer"].as_str(), |
| 271 | }; |
| 272 | Ok(match kind { |
| 273 | "checkout.session.completed" | "checkout.session.async_payment_succeeded" => self.settle_checkout(&text("id")).await?, |
| 274 | "customer.subscription.updated" | "customer.subscription.deleted" => { |
| 275 | self.settle_subscription(&text("id")).await? |
| 276 | } |
| 277 | "invoice.paid" => { |
| 278 | if let Some(subscription) = object["subscription"].as_str() { |
| 279 | self.plan_paid(subscription, &text("id"), object["amount_paid"].as_i64().unwrap_or(0)).await?; |
| 280 | self.settle_subscription(subscription).await? |
| 281 | } else if let Some(done) = self.workspace_invoice_paid(&text("id")).await? { |
| 282 | done |
| 283 | } else { |
| 284 | self.enterprise_invoice_paid(&text("id")).await? |
| 285 | } |
| 286 | } |
| 287 | "invoice.payment_failed" => match (object["subscription"].as_str(), object["metadata"]["g1t_workspace"].as_str()) { |
| 288 | (Some(subscription), _) => self.settle_subscription(subscription).await?, |
| 289 | (None, Some(tagged)) => { |
| 290 | // The invoice's own row names the workspace as it is |
| 291 | // now; the metadata keeps the slug it was sent under. |
| 292 | let workspace = self.workspace_of_invoice(&text("id")).await?.unwrap_or_else(|| tagged.to_owned()); |
| 293 | let workspace = workspace.as_str(); |
| 294 | self.mark_declined(workspace, "the card was declined for an invoice").await?; |
| 295 | format!("{workspace}: invoice payment failed; work stopped") |
| 296 | } |
| 297 | _ => "ignored: not g1t's".to_owned(), |
| 298 | }, |
| 299 | "invoice.overdue" => self.enterprise_invoice_status(&text("id"), "overdue").await?, |
| 300 | "invoice.voided" => self.enterprise_invoice_status(&text("id"), "void").await?, |
| 301 | "charge.refunded" => self.refunded(object).await?, |
| 302 | "charge.dispute.created" => self.disputed(object, true).await?, |
| 303 | "charge.dispute.closed" => self.disputed(object, object["status"].as_str() == Some("lost")).await?, |
| 304 | "customer.updated" |
| 305 | | "payment_method.attached" |
| 306 | | "payment_method.detached" |
| 307 | | "payment_method.updated" |
| 308 | | "payment_method.automatically_updated" |
| 309 | | "setup_intent.succeeded" => match card_owner { |
| 310 | Some(customer) => self.sync_card_of(customer).await?, |
| 311 | None => "ignored: no customer".to_owned(), |
| 312 | }, |
| 313 | _ => "ignored".to_owned(), |
| 314 | }) |
| 315 | } |
| 316 | |
| 317 | /// A payment page done, whether or not the person came back to g1t. |
| 318 | async fn settle_checkout(&self, session_id: &str) -> Result<String> { |
| 319 | #[derive(Deserialize)] |
| 320 | struct Open { |
| 321 | workspace: String, |
| 322 | created_by: String, |
| 323 | feature: Option<String>, |
| 324 | } |
| 325 | let Some(open) = self |
| 326 | .db |
| 327 | .prepare("SELECT workspace, created_by, feature FROM checkouts WHERE id = ? AND status = 'open'") |
| 328 | .bind(&[session_id.into()])? |
| 329 | .first::<Open>(None) |
| 330 | .await? |
| 331 | else { |
| 332 | return Ok("ignored: already settled or not g1t's".to_owned()); |
| 333 | }; |
| 334 | // A card check: saved and verified, never charged. |
| 335 | if open.feature.as_deref() == Some(crate::cards::CARD_CHECK) { |
| 336 | return Ok(match self.settle_card_check(session_id).await? { |
| 337 | Ok(done) => done, |
| 338 | Err(why) => format!("card check not passed: {why}"), |
| 339 | }); |
| 340 | } |
| 341 | let Some(stripe) = &self.stripe else { return Ok("ignored: payments off".to_owned()) }; |
| 342 | let session = stripe.session(session_id).await?; |
| 343 | if session.payment_status != "paid" && open.feature.is_none() { |
| 344 | return Ok("ignored: not paid".to_owned()); |
| 345 | } |
| 346 | let claimed = self |
| 347 | .db |
| 348 | .prepare("UPDATE checkouts SET status = 'paid' WHERE id = ? AND status = 'open' RETURNING id") |
| 349 | .bind(&[session_id.into()])? |
| 350 | .first::<Value>(None) |
| 351 | .await?; |
| 352 | if claimed.is_none() { |
| 353 | return Ok("ignored: settled meanwhile".to_owned()); |
| 354 | } |
| 355 | match open.feature.as_deref() { |
| 356 | None => { |
| 357 | let cents = i64::from(session.amount_total.unwrap_or(0)); |
| 358 | self.enter( |
| 359 | &open.workspace, |
| 360 | EntryKind::TopUp, |
| 361 | cents * 10_000, |
| 362 | "Paid in advance", |
| 363 | &session.id, |
| 364 | None, |
| 365 | None, |
| 366 | Some(&open.created_by), |
| 367 | session.customer.as_deref(), |
| 368 | ) |
| 369 | .await?; |
| 370 | Ok(format!("credited {} to {}", crate::features::dollars(cents * 10_000), open.workspace)) |
| 371 | } |
| 372 | Some(feature) => { |
| 373 | let Some(feature) = g1t_contracts::billing::Feature::parse(feature) else { |
| 374 | return Ok("ignored: unknown feature".to_owned()); |
| 375 | }; |
| 376 | if let Some(subscription_id) = &session.subscription { |
| 377 | let subscription = stripe.subscription(subscription_id).await?; |
| 378 | self.record(&open.workspace, feature, &subscription, &open.created_by).await?; |
| 379 | } |
| 380 | self.db |
| 381 | .prepare( |
| 382 | "INSERT INTO accounts (workspace, balance_micros, customer_id, created_at) VALUES (?1, 0, ?2, ?3) |
| 383 | ON CONFLICT (workspace) DO UPDATE SET customer_id = COALESCE(customer_id, ?2)", |
| 384 | ) |
| 385 | .bind(&[open.workspace.as_str().into(), crate::optional(session.customer.as_deref()), rfc3339(now_ms()).into()])? |
| 386 | .run() |
| 387 | .await?; |
| 388 | Ok(format!("{} plan started for {}", feature.title(), open.workspace)) |
| 389 | } |
| 390 | } |
| 391 | } |
| 392 | |
| 393 | /// The plan's monthly price, paid: revenue that never goes through the |
| 394 | /// ledger, recorded once per invoice for sudo's figures and for trust. |
| 395 | async fn plan_paid(&self, subscription_id: &str, invoice_id: &str, amount_cents: i64) -> Result<()> { |
| 396 | if amount_cents <= 0 || invoice_id.is_empty() { |
| 397 | return Ok(()); |
| 398 | } |
| 399 | self.db |
| 400 | .prepare( |
| 401 | "INSERT INTO plan_payments (invoice_id, workspace, amount_micros, paid_at) |
| 402 | SELECT ?1, workspace, ?2, ?3 FROM subscriptions WHERE subscription_id = ?4 |
| 403 | ON CONFLICT (invoice_id) DO NOTHING", |
| 404 | ) |
| 405 | .bind(&[ |
| 406 | invoice_id.into(), |
| 407 | ((amount_cents * 10_000) as f64).into(), |
| 408 | rfc3339(now_ms()).into(), |
| 409 | subscription_id.into(), |
| 410 | ])? |
| 411 | .run() |
| 412 | .await?; |
| 413 | Ok(()) |
| 414 | } |
| 415 | |
| 416 | /// A plan that changed at Stripe: renewed, failed, canceled. |
| 417 | pub(crate) async fn settle_subscription(&self, subscription_id: &str) -> Result<String> { |
| 418 | #[derive(Deserialize)] |
| 419 | struct Plan { |
| 420 | workspace: String, |
| 421 | feature: String, |
| 422 | started_by: String, |
| 423 | } |
| 424 | let Some(plan) = self |
| 425 | .db |
| 426 | .prepare("SELECT workspace, feature, started_by FROM subscriptions WHERE subscription_id = ?") |
| 427 | .bind(&[subscription_id.into()])? |
| 428 | .first::<Plan>(None) |
| 429 | .await? |
| 430 | else { |
| 431 | return Ok("ignored: not a g1t plan".to_owned()); |
| 432 | }; |
| 433 | let (Some(stripe), Some(feature)) = (&self.stripe, g1t_contracts::billing::Feature::parse(&plan.feature)) else { |
| 434 | return Ok("ignored".to_owned()); |
| 435 | }; |
| 436 | let subscription = stripe.subscription(subscription_id).await?; |
| 437 | self.record(&plan.workspace, feature, &subscription, &plan.started_by).await?; |
| 438 | Ok(format!("{} plan for {} is {}", feature.title(), plan.workspace, subscription.status)) |
| 439 | } |
| 440 | |
| 441 | /// The workspace a Stripe customer belongs to. |
| 442 | pub(crate) async fn workspace_of_customer(&self, customer: &str) -> Result<Option<String>> { |
| 443 | #[derive(Deserialize)] |
| 444 | struct Row { |
| 445 | workspace: String, |
| 446 | } |
| 447 | Ok(self |
| 448 | .db |
| 449 | .prepare("SELECT workspace FROM accounts WHERE customer_id = ?") |
| 450 | .bind(&[customer.into()])? |
| 451 | .first::<Row>(None) |
| 452 | .await? |
| 453 | .map(|row| row.workspace)) |
| 454 | } |
| 455 | |
| 456 | /// The workspace a workspace invoice was sent to, under its slug now. |
| 457 | async fn workspace_of_invoice(&self, invoice_id: &str) -> Result<Option<String>> { |
| 458 | #[derive(Deserialize)] |
| 459 | struct Row { |
| 460 | workspace: String, |
| 461 | } |
| 462 | Ok(self |
| 463 | .db |
| 464 | .prepare("SELECT workspace FROM workspace_invoices WHERE invoice_id = ?") |
| 465 | .bind(&[invoice_id.into()])? |
| 466 | .first::<Row>(None) |
| 467 | .await? |
| 468 | .map(|row| row.workspace)) |
| 469 | } |
| 470 | |
| 471 | /// Money given back: what was paid is less, by the refund. |
| 472 | async fn refunded(&self, charge: &Value) -> Result<String> { |
| 473 | let Some(customer) = charge["customer"].as_str() else { return Ok("ignored: no customer".to_owned()) }; |
| 474 | let Some(workspace) = self.workspace_of_customer(customer).await? else { |
| 475 | return Ok("ignored: not a workspace's customer".to_owned()); |
| 476 | }; |
| 477 | let refunded = charge["amount_refunded"].as_i64().unwrap_or(0); |
| 478 | if refunded <= 0 { |
| 479 | return Ok("ignored: nothing refunded".to_owned()); |
| 480 | } |
| 481 | // Each refund total once, so partial refunds add up correctly. |
| 482 | let charge_id = charge["id"].as_str().unwrap_or_default(); |
| 483 | #[derive(Deserialize)] |
| 484 | struct Sum { |
| 485 | micros: Option<i64>, |
| 486 | } |
| 487 | let already = self |
| 488 | .db |
| 489 | .prepare("SELECT -SUM(amount_micros) AS micros FROM ledger WHERE reference LIKE ?") |
| 490 | .bind(&[format!("refund/{charge_id}/%").into()])? |
| 491 | .first::<Sum>(None) |
| 492 | .await? |
| 493 | .and_then(|s| s.micros) |
| 494 | .unwrap_or(0); |
| 495 | let new = refunded * 10_000 - already; |
| 496 | if new <= 0 { |
| 497 | return Ok("ignored: refund already recorded".to_owned()); |
| 498 | } |
| 499 | self.enter( |
| 500 | &workspace, |
| 501 | EntryKind::TopUp, |
| 502 | -new, |
| 503 | "Refunded to the card", |
| 504 | &format!("refund/{charge_id}/{refunded}"), |
| 505 | None, |
| 506 | None, |
| 507 | None, |
| 508 | None, |
| 509 | ) |
| 510 | .await?; |
| 511 | Ok(format!("refund of {} recorded for {workspace}", crate::features::dollars(new))) |
| 512 | } |
| 513 | |
| 514 | /// A disputed payment stops the workspace's work until it is resolved; |
| 515 | /// one closed in the workspace's favour lets it go on. |
| 516 | async fn disputed(&self, dispute: &Value, stop: bool) -> Result<String> { |
| 517 | let Some(stripe) = &self.stripe else { return Ok("ignored".to_owned()) }; |
| 518 | let Some(charge_id) = dispute["charge"].as_str() else { return Ok("ignored: no charge".to_owned()) }; |
| 519 | let charge: Value = stripe.get(&format!("/charges/{charge_id}")).await?; |
| 520 | let Some(workspace) = (match charge["customer"].as_str() { |
| 521 | Some(customer) => self.workspace_of_customer(customer).await?, |
| 522 | None => None, |
| 523 | }) else { |
| 524 | return Ok("ignored: not a workspace's customer".to_owned()); |
| 525 | }; |
| 526 | let now = rfc3339(now_ms()); |
| 527 | // The disputed payment never counts toward trust again. |
| 528 | for reference in [charge["payment_intent"].as_str(), charge["invoice"].as_str()].into_iter().flatten() { |
| 529 | self.db |
| 530 | .prepare("UPDATE ledger SET disputed = ? WHERE workspace = ? AND reference = ?") |
| 531 | .bind(&[(if stop { 1 } else { 0 }).into(), workspace.as_str().into(), reference.into()])? |
| 532 | .run() |
| 533 | .await?; |
| 534 | } |
| 535 | if stop { |
| 536 | self.db |
| 537 | .prepare( |
| 538 | "INSERT INTO limits (workspace, autopay_failed_at, autopay_error, updated_at) VALUES (?1, ?2, ?3, ?2) |
| 539 | ON CONFLICT (workspace) DO UPDATE SET autopay_failed_at = ?2, autopay_error = ?3, updated_at = ?2", |
| 540 | ) |
| 541 | .bind(&[workspace.as_str().into(), now.as_str().into(), "a payment was disputed with the card's bank".into()])? |
| 542 | .run() |
| 543 | .await?; |
| 544 | } else { |
| 545 | self.db |
| 546 | .prepare("UPDATE limits SET autopay_failed_at = NULL, autopay_error = NULL WHERE workspace = ?") |
| 547 | .bind(&[workspace.as_str().into()])? |
| 548 | .run() |
| 549 | .await?; |
| 550 | } |
| 551 | let account = self.account_of(&workspace).await?; |
| 552 | let what = if stop { "dispute: work stopped" } else { "dispute closed in the workspace's favour" }; |
| 553 | self.audit(&account.id, "dispute", &format!("{workspace}: {what}"), "stripe").await?; |
| 554 | Ok(format!("{workspace}: {what}")) |
| 555 | } |
| 556 | |
| 557 | // --- Enterprise invoices ------------------------------------------------ |
| 558 | |
| 559 | pub(crate) async fn admin_enterprise_billing(&self, a: AdminEnterpriseBillingArgs) -> Result<Outcome<BillingAccount>> { |
| 560 | let email = a.email.trim().to_lowercase(); |
| 561 | if !email.contains('@') || email.contains(char::is_whitespace) || a.by.trim().is_empty() { |
| 562 | return Ok(Outcome::fail(FailureCode::Invalid, "Give the email the enterprise's invoices go to.")); |
| 563 | } |
| 564 | let Some(stripe) = &self.stripe else { |
| 565 | return Ok(Outcome::fail(FailureCode::Conflict, "Payments are not set up on this g1t.")); |
| 566 | }; |
| 567 | #[derive(Deserialize)] |
| 568 | struct Row { |
| 569 | name: String, |
| 570 | kind: String, |
| 571 | customer_id: Option<String>, |
| 572 | } |
| 573 | let Some(row) = self |
| 574 | .db |
| 575 | .prepare("SELECT name, kind, customer_id FROM billing_accounts WHERE id = ?") |
| 576 | .bind(&[a.id.as_str().into()])? |
| 577 | .first::<Row>(None) |
| 578 | .await? |
| 579 | .filter(|row| row.kind == "enterprise") |
| 580 | else { |
| 581 | return Ok(Outcome::fail(FailureCode::NotFound, "No such enterprise.")); |
| 582 | }; |
| 583 | #[derive(Deserialize)] |
| 584 | struct Customer { |
| 585 | id: String, |
| 586 | } |
| 587 | let fields = [ |
| 588 | ("name", row.name.clone()), |
| 589 | ("email", email.clone()), |
| 590 | ("metadata[g1t_enterprise]", a.id.clone()), |
| 591 | ]; |
| 592 | let customer: Customer = match &row.customer_id { |
| 593 | Some(id) => stripe.post(&format!("/customers/{id}"), &fields).await?, |
| 594 | None => stripe.post("/customers", &fields).await?, |
| 595 | }; |
| 596 | self.db |
| 597 | .prepare("UPDATE billing_accounts SET billing_email = ?, customer_id = ? WHERE id = ?") |
| 598 | .bind(&[email.as_str().into(), customer.id.as_str().into(), a.id.as_str().into()])? |
| 599 | .run() |
| 600 | .await?; |
| 601 | self.audit(&a.id, "billing_email", &format!("Invoices go to {email}"), &a.by).await?; |
| 602 | Ok(match self.enterprise(&a.id).await? { |
| 603 | Some(account) => Outcome::Ok(account), |
| 604 | None => Outcome::fail(FailureCode::NotFound, "No such enterprise."), |
| 605 | }) |
| 606 | } |
| 607 | |
| 608 | pub(crate) async fn admin_invoice_enterprise(&self, a: AdminInvoiceEnterpriseArgs) -> Result<Outcome<EnterpriseInvoice>> { |
| 609 | if a.by.trim().is_empty() { |
| 610 | return Ok(Outcome::fail(FailureCode::Invalid, "Say who is sending it.")); |
| 611 | } |
| 612 | match self.invoice_enterprise(&a.id, "now", &a.by).await? { |
| 613 | Ok(invoice) => Ok(Outcome::Ok(invoice)), |
| 614 | Err(why) => Ok(Outcome::fail(FailureCode::Conflict, why)), |
| 615 | } |
| 616 | } |
| 617 | |
| 618 | /// Invoices each enterprise for the month that closed. Live payments |
| 619 | /// only; sudo can send one sooner in test mode. |
| 620 | pub(crate) async fn invoice_enterprises(&self) -> Result<()> { |
| 621 | if !self.stripe.as_ref().is_some_and(crate::stripe::Stripe::live) { |
| 622 | return Ok(()); |
| 623 | } |
| 624 | let closing = crate::limits::previous_month(&rfc3339(now_ms())[..7]); |
| 625 | #[derive(Deserialize)] |
| 626 | struct Id { |
| 627 | id: String, |
| 628 | } |
| 629 | let due = self |
| 630 | .db |
| 631 | .prepare( |
| 632 | "SELECT id FROM billing_accounts WHERE kind = 'enterprise' AND customer_id IS NOT NULL |
| 633 | AND terms_kind <> 'comped' |
| 634 | AND NOT EXISTS (SELECT 1 FROM enterprise_invoices i WHERE i.account_id = billing_accounts.id AND i.period = ?)", |
| 635 | ) |
| 636 | .bind(&[closing.as_str().into()])? |
| 637 | .all() |
| 638 | .await? |
| 639 | .results::<Id>()?; |
| 640 | for Id { id } in due { |
| 641 | if let Err(why) = self.invoice_enterprise(&id, &closing, "month close").await? { |
| 642 | worker::console_log!("enterprise {id} not invoiced for {closing}: {why}"); |
| 643 | } |
| 644 | } |
| 645 | Ok(()) |
| 646 | } |
| 647 | |
| 648 | /// One invoice for what each of the enterprise's workspaces owes now. |
| 649 | async fn invoice_enterprise(&self, id: &str, period: &str, by: &str) -> Result<std::result::Result<EnterpriseInvoice, String>> { |
| 650 | let Some(stripe) = &self.stripe else { return Ok(Err("Payments are not set up.".into())) }; |
| 651 | let Some(account) = self.enterprise(id).await? else { return Ok(Err("No such enterprise.".into())) }; |
| 652 | #[derive(Deserialize)] |
| 653 | struct Customer { |
| 654 | customer_id: Option<String>, |
| 655 | } |
| 656 | let Some(customer) = self |
| 657 | .db |
| 658 | .prepare("SELECT customer_id FROM billing_accounts WHERE id = ?") |
| 659 | .bind(&[id.into()])? |
| 660 | .first::<Customer>(None) |
| 661 | .await? |
| 662 | .and_then(|row| row.customer_id) |
| 663 | else { |
| 664 | return Ok(Err("Set where the enterprise's invoices go first.".into())); |
| 665 | }; |
| 666 | // What each workspace owes: its charges less what it has paid, and |
| 667 | // less what is on invoices still open. |
| 668 | let mut lines = vec![]; |
| 669 | for workspace in &account.workspaces { |
| 670 | let balance = self.row(workspace).await?.map_or(0, |row| row.balance_micros); |
| 671 | #[derive(Deserialize)] |
| 672 | struct Sum { |
| 673 | micros: Option<i64>, |
| 674 | } |
| 675 | let invoiced = self |
| 676 | .db |
| 677 | .prepare( |
| 678 | "SELECT SUM(l.amount_micros) AS micros FROM enterprise_invoice_lines l |
| 679 | JOIN enterprise_invoices i ON i.invoice_id = l.invoice_id |
| 680 | WHERE l.workspace = ? AND i.status IN ('open', 'overdue')", |
| 681 | ) |
| 682 | .bind(&[workspace.as_str().into()])? |
| 683 | .first::<Sum>(None) |
| 684 | .await? |
| 685 | .and_then(|s| s.micros) |
| 686 | .unwrap_or(0); |
| 687 | let owed = (-balance).max(0) - invoiced; |
| 688 | if owed >= 10_000 { |
| 689 | lines.push(InvoiceLine { workspace: workspace.clone(), amount_micros: owed }); |
| 690 | } |
| 691 | } |
| 692 | if lines.is_empty() { |
| 693 | return Ok(Err("Its workspaces owe nothing to invoice.".into())); |
| 694 | } |
| 695 | for line in &lines { |
| 696 | let cents = (line.amount_micros + 9_999) / 10_000; |
| 697 | let fields = [ |
| 698 | ("customer", customer.clone()), |
| 699 | ("amount", cents.to_string()), |
| 700 | ("currency", "usd".to_owned()), |
| 701 | ("description", format!("{}: g1t usage", line.workspace)), |
| 702 | ("metadata[workspace]", line.workspace.clone()), |
| 703 | ]; |
| 704 | let _: Value = stripe.post("/invoiceitems", &fields).await?; |
| 705 | } |
| 706 | let fields = [ |
| 707 | ("customer", customer.clone()), |
| 708 | ("collection_method", "send_invoice".to_owned()), |
| 709 | ("days_until_due", "30".to_owned()), |
| 710 | ("pending_invoice_items_behavior", "include".to_owned()), |
| 711 | ("description", format!("g1t usage for the {} enterprise", account.name)), |
| 712 | ("metadata[g1t_enterprise]", id.to_owned()), |
| 713 | ("metadata[period]", period.to_owned()), |
| 714 | ]; |
| 715 | #[derive(Deserialize)] |
| 716 | struct Invoice { |
| 717 | id: String, |
| 718 | #[serde(default)] |
| 719 | hosted_invoice_url: Option<String>, |
| 720 | #[serde(default)] |
| 721 | amount_due: i64, |
| 722 | } |
| 723 | let draft: Invoice = stripe.post("/invoices", &fields).await?; |
| 724 | let _: Value = stripe.post(&format!("/invoices/{}/finalize", draft.id), &[]).await?; |
| 725 | let sent: Invoice = stripe.post(&format!("/invoices/{}/send", draft.id), &[]).await?; |
| 726 | let now = rfc3339(now_ms()); |
| 727 | let total = lines.iter().map(|l| l.amount_micros).sum::<i64>().max(sent.amount_due * 10_000); |
| 728 | let mut writes = vec![self |
| 729 | .db |
| 730 | .prepare( |
| 731 | "INSERT INTO enterprise_invoices (invoice_id, account_id, period, amount_micros, status, hosted_url, created_by, created_at) |
| 732 | VALUES (?, ?, ?, ?, 'open', ?, ?, ?)", |
| 733 | ) |
| 734 | .bind(&[ |
| 735 | sent.id.as_str().into(), |
| 736 | id.into(), |
| 737 | period.into(), |
| 738 | (total as f64).into(), |
| 739 | crate::optional(sent.hosted_invoice_url.as_deref()), |
| 740 | by.into(), |
| 741 | now.as_str().into(), |
| 742 | ])?]; |
| 743 | for line in &lines { |
| 744 | writes.push( |
| 745 | self.db |
| 746 | .prepare("INSERT INTO enterprise_invoice_lines (invoice_id, workspace, amount_micros) VALUES (?, ?, ?)") |
| 747 | .bind(&[sent.id.as_str().into(), line.workspace.as_str().into(), (line.amount_micros as f64).into()])?, |
| 748 | ); |
| 749 | } |
| 750 | self.db.batch(writes).await?; |
| 751 | self.audit(id, "invoice", &format!("Invoice {} for {} sent ({period})", sent.id, crate::features::dollars(total)), by) |
| 752 | .await?; |
| 753 | Ok(Ok(EnterpriseInvoice { |
| 754 | invoice_id: sent.id, |
| 755 | hosted_url: sent.hosted_invoice_url, |
| 756 | amount_micros: total, |
| 757 | status: "open".to_owned(), |
| 758 | period: period.to_owned(), |
| 759 | lines, |
| 760 | created_at: now, |
| 761 | })) |
| 762 | } |
| 763 | |
| 764 | /// An enterprise invoice paid: each workspace is credited its line, and |
| 765 | /// any stop for the invoice is lifted. |
| 766 | async fn enterprise_invoice_paid(&self, invoice_id: &str) -> Result<String> { |
| 767 | let claimed = self |
| 768 | .db |
| 769 | .prepare( |
| 770 | "UPDATE enterprise_invoices SET status = 'paid', paid_at = ? WHERE invoice_id = ? AND status <> 'paid' |
| 771 | RETURNING invoice_id", |
| 772 | ) |
| 773 | .bind(&[rfc3339(now_ms()).into(), invoice_id.into()])? |
| 774 | .first::<Value>(None) |
| 775 | .await?; |
| 776 | if claimed.is_none() { |
| 777 | return Ok("ignored: not an open enterprise invoice".to_owned()); |
| 778 | } |
| 779 | let lines = self.invoice_lines(invoice_id).await?; |
| 780 | for line in &lines { |
| 781 | self.enter( |
| 782 | &line.workspace, |
| 783 | EntryKind::TopUp, |
| 784 | line.amount_micros, |
| 785 | &format!("Paid on the enterprise's invoice {invoice_id}"), |
| 786 | &format!("inv/{invoice_id}/{}", line.workspace), |
| 787 | None, |
| 788 | None, |
| 789 | None, |
| 790 | None, |
| 791 | ) |
| 792 | .await?; |
| 793 | } |
| 794 | Ok(format!("invoice {invoice_id} paid; {} workspaces credited", lines.len())) |
| 795 | } |
| 796 | |
| 797 | /// An enterprise invoice that went overdue stops its workspaces' work; |
| 798 | /// one voided is simply closed. |
| 799 | async fn enterprise_invoice_status(&self, invoice_id: &str, status: &str) -> Result<String> { |
| 800 | let updated = self |
| 801 | .db |
| 802 | .prepare("UPDATE enterprise_invoices SET status = ? WHERE invoice_id = ? AND status <> 'paid' RETURNING invoice_id") |
| 803 | .bind(&[status.into(), invoice_id.into()])? |
| 804 | .first::<Value>(None) |
| 805 | .await?; |
| 806 | if updated.is_none() { |
| 807 | return Ok("ignored: not an open enterprise invoice".to_owned()); |
| 808 | } |
| 809 | if status == "overdue" { |
| 810 | let now = rfc3339(now_ms()); |
| 811 | for line in self.invoice_lines(invoice_id).await? { |
| 812 | self.db |
| 813 | .prepare( |
| 814 | "INSERT INTO limits (workspace, autopay_failed_at, autopay_error, updated_at) VALUES (?1, ?2, ?3, ?2) |
| 815 | ON CONFLICT (workspace) DO UPDATE SET autopay_failed_at = ?2, autopay_error = ?3, updated_at = ?2", |
| 816 | ) |
| 817 | .bind(&[line.workspace.as_str().into(), now.as_str().into(), format!("the enterprise's invoice {invoice_id} is overdue").into()])? |
| 818 | .run() |
| 819 | .await?; |
| 820 | } |
| 821 | } |
| 822 | Ok(format!("invoice {invoice_id} is {status}")) |
| 823 | } |
| 824 | |
| 825 | async fn invoice_lines(&self, invoice_id: &str) -> Result<Vec<InvoiceLine>> { |
| 826 | Ok(self |
| 827 | .db |
| 828 | .prepare("SELECT workspace, amount_micros FROM enterprise_invoice_lines WHERE invoice_id = ?") |
| 829 | .bind(&[invoice_id.into()])? |
| 830 | .all() |
| 831 | .await? |
| 832 | .results::<LineRow>()? |
| 833 | .into_iter() |
| 834 | .map(|row| InvoiceLine { workspace: row.workspace, amount_micros: row.amount_micros }) |
| 835 | .collect()) |
| 836 | } |
| 837 | |
| 838 | /// An enterprise's invoices, newest first. |
| 839 | pub(crate) async fn enterprise_invoices(&self, id: &str) -> Result<Vec<EnterpriseInvoice>> { |
| 840 | let rows = self |
| 841 | .db |
| 842 | .prepare("SELECT * FROM enterprise_invoices WHERE account_id = ? ORDER BY created_at DESC LIMIT 24") |
| 843 | .bind(&[JsValue::from(id)])? |
| 844 | .all() |
| 845 | .await? |
| 846 | .results::<InvoiceRow>()?; |
| 847 | let mut invoices = vec![]; |
| 848 | for row in rows { |
| 849 | invoices.push(EnterpriseInvoice { |
| 850 | lines: self.invoice_lines(&row.invoice_id).await?, |
| 851 | invoice_id: row.invoice_id, |
| 852 | hosted_url: row.hosted_url, |
| 853 | amount_micros: row.amount_micros, |
| 854 | status: row.status, |
| 855 | period: row.period, |
| 856 | created_at: row.created_at, |
| 857 | }); |
| 858 | } |
| 859 | Ok(invoices) |
| 860 | } |
| 861 | } |
| 862 | |
| 863 | #[cfg(test)] |
| 864 | mod tests { |
| 865 | use super::*; |
| 866 | |
| 867 | fn sign(payload: &str, secret: &str, t: i64) -> String { |
| 868 | let mut mac = Hmac::<Sha256>::new_from_slice(secret.as_bytes()).unwrap(); |
| 869 | mac.update(format!("{t}.{payload}").as_bytes()); |
| 870 | format!("t={t},v1={}", hex::encode(mac.finalize().into_bytes())) |
| 871 | } |
| 872 | |
| 873 | #[test] |
| 874 | fn a_destination_misses_the_events_billing_handles_that_it_does_not_send() { |
| 875 | let has: Vec<String> = EVENTS.iter().take(11).map(|e| (*e).to_owned()).collect(); |
| 876 | assert_eq!(missing_events(&has), EVENTS[11..].iter().map(|e| (*e).to_owned()).collect::<Vec<_>>()); |
| 877 | let all: Vec<String> = EVENTS.iter().map(|e| (*e).to_owned()).collect(); |
| 878 | assert!(missing_events(&all).is_empty()); |
| 879 | assert!(missing_events(&["*".to_owned()]).is_empty()); |
| 880 | } |
| 881 | |
| 882 | #[test] |
| 883 | fn a_signed_event_is_believed_only_as_signed_and_only_fresh() { |
| 884 | let payload = r#"{"id":"evt_1","type":"invoice.paid"}"#; |
| 885 | let header = sign(payload, "whsec_test", 1_000_000); |
| 886 | assert!(verify(payload, &header, "whsec_test", 1_000_010)); |
| 887 | assert!(!verify(payload, &header, "whsec_other", 1_000_010)); |
| 888 | assert!(!verify(&payload.replace("paid", "voided"), &header, "whsec_test", 1_000_010)); |
| 889 | assert!(!verify(payload, &header, "whsec_test", 1_000_000 + 301)); |
| 890 | assert!(!verify(payload, "v1=abc", "whsec_test", 1_000_000)); |
| 891 | // Stripe may sign with more than one secret while one is rolled. |
| 892 | let both = format!("{},v1=00ff", sign(payload, "whsec_test", 1_000_000)); |
| 893 | assert!(verify(payload, &both, "whsec_test", 1_000_000)); |
| 894 | } |
| 895 | } |