feat(cloud-connection): publish the control plane's upgrade entry as an absolute upgradeUrl on /api/v1/runtime/config (#14590)

RuntimeConfigPlugin gains one optional host option, upgradeUrl, on the
exported RuntimeConfigPluginConfig, and the served payload gains one optional
top-level key of the same name beside cloudUrl. Declared, it is served
verbatim; undeclared (or empty), the key is absent; not an absolute http(s)
URL, it is refused and named at mount and no key is served.

Contract test covers both directions on key presence plus the refusal group;
README gains the field row and semantics; changeset minor.

Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

Author: hotlong

.changeset/runtime-config-upgrade-url.md

@@ -0,0 +1,34 @@
+---
+"@objectstack/cloud-connection": minor
+---
+
+feat(cloud-connection): `/api/v1/runtime/config` can carry the control plane's upgrade / billing entry as an absolute `upgradeUrl` (#14514)
+
+**Additive, optional, default-absent.** No existing key moves; a runtime that
+declares nothing serves the same payload as before.
+
+The tenant Console offers an "upgrade" exit when the AI quota guardrail refuses
+a turn. It used to compose the target from `cloudUrl` plus a guessed console
+mount, app slug and page route — three facts owned by whoever deploys the
+control plane — and missed all three, landing on the control plane's API 404.
+The control plane's own two call sites did not even agree on the spelling.
+Maintainer ruling 2026-09-02 (cloud#1850, option A): the payload carries the
+absolute URL; the host that owns the page declares it; the Console renders a
+link only when the key is present (objectui already consumes it that way).
+
+`RuntimeConfigPlugin` gains one option, `upgradeUrl`, on the exported
+`RuntimeConfigPluginConfig`, and the served payload gains one optional top-level
+key of the same name beside `cloudUrl`:
+
+- **declared** → served verbatim (no trailing-slash trimming, no
+  re-serialisation);
+- **undeclared** (or empty / whitespace-only) → the key is NOT THERE — asserted
+  on key presence, not on `undefined`;
+- **not absolute** (`/settings/billing`, a bare host, a non-`http(s)` scheme) →
+  refused and named in the boot log, no key served. The Console opens this URL
+  from the tenant origin, so a relative path would resolve against the wrong
+  host and recreate the defect this key removes.
+
+Host option only — no env var. The value belongs to the distribution whose
+control plane serves the page; the cloud subclass fills it (cloud#1850's other
+half, after the pin bump).

packages/cloud-connection/README.md

@@ -130,6 +130,49 @@ const sink = readClientErrorReporting(payload);
 if (sink) initErrorReporting(sink);
 ```
 
+## The control plane's upgrade entry is published, not derived
+
+`GET /api/v1/runtime/config` can carry an optional top-level `upgradeUrl` —
+the **absolute** URL of the control plane's upgrade / billing page — beside the
+`cloudUrl` the Console already reads:
+
+| Key | Type | Default | Meaning |
+|---|---|---|---|
+| `upgradeUrl` | absolute `http(s)` URL | **absent** | Where the Console sends a user who chooses "upgrade" (AI quota exhausted, plan limit hit). Declared by the host that owns the page and served verbatim; no key means "render no link". |
+
+```json
+{
+  "cloudUrl": "https://cloud.example.com",
+  "upgradeUrl": "https://cloud.example.com/_console/apps/cloud_control/page/pricing"
+}
+```
+
+It is declared by the host that composes the plugin — there is no env var,
+because the value belongs to the distribution whose control plane serves the
+page:
+
+```ts
+new RuntimeConfigPlugin({ upgradeUrl: 'https://cloud.example.com/_console/apps/cloud_control/page/pricing' })
+```
+
+Why it is published rather than composed by the Console: the destination
+depends on the console mount, the app slug and the page route — three facts
+owned by whoever deploys the control plane — and a consumer in another repo
+that guessed them landed on the control plane's API 404. Three properties,
+pinned by `runtime-config-upgrade-url.test.ts`:
+
+- **Absent by default.** A vanilla `objectstack dev`, a self-hosted box and an
+  air-gapped deployment have no billing page. They serve no `upgradeUrl` key at
+  all — never `""` or a guessed default — and the Console reads "no key" as "no
+  link".
+- **Verbatim when declared.** No trailing-slash trimming, no re-serialisation:
+  what the host declared is what the Console opens.
+- **Absolute, or refused at mount.** The Console opens this URL from the
+  *tenant* origin, so a relative path (`/settings/billing`) would resolve
+  against the tenant runtime and recreate the guessed-path 404 this key
+  removes. A relative path or a non-`http(s)` scheme is refused and named in
+  the boot log, and no key is served.
+
 ## Boundary (open mechanism, closed intelligence)
 
 This package is **mechanism**: proxying a catalog, installing into the local

packages/cloud-connection/src/runtime-config-plugin.ts

@@ -12,13 +12,39 @@
  *
  *   {
  *     cloudUrl: string,            // base URL of the upstream cloud ('' = same origin)
+ *     upgradeUrl?: string,         // absolute URL of the control plane's upgrade / billing entry — absent unless declared (#14514)
  *     singleEnvironment: boolean,
  *     defaultOrgId?, defaultEnvironmentId?,   // multi-tenant, per-hostname
  *     features: { installLocal, marketplace, aiStudio, autoPublishAiBuilds, ... },
  *     branding: { productName, productShortName, stage?, logoUrl, faviconUrl, brandColor, pwaDescription, pwaThemeColor },
  *     telemetry: { errorReporting?: { dsn, sendDefaultPii, environment?, tracesSampleRate, replaysOnErrorSampleRate } }
  *   }
  *
+ * ## `upgradeUrl` — the control plane's upgrade entry is published, not derived (#14514)
+ *
+ * The tenant Console offers an "upgrade" exit when the AI quota guardrail
+ * refuses a turn. It used to COMPOSE the target from `cloudUrl` plus a guessed
+ * console mount, app slug and page route — three facts owned by whoever
+ * deploys the control plane — and missed all three, landing on the control
+ * plane's API 404. The control plane's own two call sites did not even agree
+ * on the spelling, which settles it: a consumer in another repo cannot derive
+ * what the producer cannot keep to one dialect. Maintainer ruling 2026-09-02
+ * (cloud#1850, option A): this payload carries the ABSOLUTE URL, the host that
+ * owns the page declares it, and the Console renders a link only when the key
+ * is present.
+ *
+ * Optional and default-absent — the same shape as `branding.stage` below: a
+ * runtime that says nothing serves no key, never `''` or a guessed default,
+ * because a vanilla `objectstack dev`, a self-hosted box and an air-gapped
+ * deployment have no billing page to point at. Declared, it passes through
+ * VERBATIM. The one thing enforced is that it is absolute (`http:` /
+ * `https:`): the Console opens it from the TENANT origin, so a relative path —
+ * the control plane's own current `upgrade_url` dialect — would resolve against
+ * the tenant runtime and recreate the guessed-path 404 this key removes.
+ * Refused loudly at mount, never coerced, like every other knob in this file.
+ * Host option only, no env var: the value belongs to the distribution whose
+ * control plane serves the page, and the cloud subclass fills it.
+ *
  * ## `branding.stage` — a documented knob that this runtime never sent (#9252)
  *
  * The Console's `PreviewBadge` reads `branding.stage` to decide whether to show
@@ -434,6 +460,22 @@ function asPlatformStage(value: string | undefined): PlatformStage | undefined {
         : undefined;
 }
 
+/**
+ * Is this host-supplied upgrade entry an ABSOLUTE http(s) URL? (#14514)
+ *
+ * The parse decides only whether the value is forwarded at all; the value
+ * itself is served verbatim, never re-serialised, so what the host declared
+ * is byte-for-byte what the Console opens. Anything the WHATWG parser cannot
+ * resolve without a base (a relative path, a bare host) and any scheme other
+ * than http(s) — this string is rendered as a link in every browser that
+ * loads the Console — is refused.
+ */
+function isAbsoluteHttpUrl(value: string): boolean {
+    let parsed: URL;
+    try { parsed = new URL(value); } catch { return false; }
+    return parsed.protocol === 'http:' || parsed.protocol === 'https:';
+}
+
 /**
  * Feature-flag overrides a host's distribution policy can derive per request.
  *
@@ -463,6 +505,34 @@ export interface RuntimeConfigPluginConfig {
      * for marketplace + install).
      */
     controlPlaneUrl?: string;
+    /**
+     * Absolute URL of the control plane's upgrade / billing entry, served
+     * verbatim as the top-level `upgradeUrl` key beside `cloudUrl` (#14514).
+     *
+     * The tenant Console offers an "upgrade" exit when the AI quota guardrail
+     * refuses a turn. It used to compose the target from `cloudUrl` plus a
+     * guessed console mount, app slug and route — three facts that belong to
+     * whoever deploys the control plane — and missed all three (a 404 on the
+     * control plane's API router). The destination is therefore declared here
+     * by the host that owns it, and the Console renders the link only when
+     * the key is present.
+     *
+     * ⛔ Default **absent**: unset serves no `upgradeUrl` key at all, never an
+     * empty string or a guessed default. A vanilla `objectstack dev`, a
+     * self-hosted box and an air-gapped deployment have no billing page, and
+     * the Console already reads "no key" as "no link". Empty / whitespace-only
+     * reads as unset (absent, silent).
+     *
+     * ⛔ Must be ABSOLUTE (`http:` / `https:`). A relative path such as
+     * `/settings/billing` is refused and named at mount time, never forwarded:
+     * the Console opens this URL from the TENANT origin, where a relative path
+     * would resolve against the tenant runtime and recreate exactly the
+     * guessed-path 404 this key exists to remove.
+     *
+     * Host option only — no env var. The value belongs to the distribution
+     * whose control plane serves the page; the cloud subclass fills it.
+     */
+    upgradeUrl?: string;
     /**
      * CEILING for the `features.installLocal` flag — no longer its source
      * (#8388).
@@ -613,6 +683,10 @@ export class RuntimeConfigPlugin implements Plugin {
      * invisible from the SPA end.
      */
     private readonly refusedStage: string | undefined;
+    /** The declared upgrade entry, or `undefined` for "send no key" (unset or refused). */
+    private readonly upgradeUrl: string | undefined;
+    /** The refused spelling, kept so `start()` can name it once — same reason as `refusedStage`. */
+    private readonly refusedUpgradeUrl: string | undefined;
     private readonly logoUrl: string | undefined;
     private readonly faviconUrl: string | undefined;
     private readonly brandColor: string | undefined;
@@ -655,6 +729,19 @@ export class RuntimeConfigPlugin implements Plugin {
         const requestedStage = config.stage ?? (envStage || undefined);
         this.stage = asPlatformStage(requestedStage);
         this.refusedStage = this.stage === undefined ? requestedStage : undefined;
+        // Upgrade / billing entry (#14514). Empty reads as unset; anything
+        // actually said that is not an absolute http(s) URL is refused and
+        // named at mount, never forwarded. Verbatim on acceptance — the
+        // original string, not the parser's re-serialisation.
+        const requestedUpgradeUrl = typeof config.upgradeUrl === 'string' && config.upgradeUrl.trim() !== ''
+            ? config.upgradeUrl
+            : undefined;
+        this.upgradeUrl = requestedUpgradeUrl !== undefined && isAbsoluteHttpUrl(requestedUpgradeUrl)
+            ? requestedUpgradeUrl
+            : undefined;
+        this.refusedUpgradeUrl = requestedUpgradeUrl !== undefined && this.upgradeUrl === undefined
+            ? requestedUpgradeUrl
+            : undefined;
         const envLogoUrl = (typeof process !== 'undefined' ? process.env?.OS_LOGO_URL : undefined)?.trim();
         const envFaviconUrl = (typeof process !== 'undefined' ? process.env?.OS_FAVICON_URL : undefined)?.trim();
         const envBrandColor = (typeof process !== 'undefined' ? process.env?.OS_BRAND_COLOR : undefined)?.trim();
@@ -743,6 +830,20 @@ export class RuntimeConfigPlugin implements Plugin {
                 );
             }
 
+            // A host that declared an upgrade entry the Console could not
+            // safely open (#14514) — a relative path, or a non-http scheme.
+            // Same shape as the stage refusal above: they meant to configure
+            // something, it was refused rather than coerced, and the
+            // consequence (no upgrade link rendered) must not be silent.
+            if (this.refusedUpgradeUrl !== undefined) {
+                ctx.logger?.warn?.(
+                    `[RuntimeConfigPlugin] ignoring upgradeUrl ${JSON.stringify(this.refusedUpgradeUrl)} `
+                    + `(the \`upgradeUrl\` option): it must be an absolute http(s) URL — the Console opens it `
+                    + `from the tenant origin, so a relative path would resolve against the wrong host. `
+                    + `No upgradeUrl key is served and the Console renders no upgrade link.`,
+                );
+            }
+
             // Telemetry knobs the operator got wrong (#12681). Same shape and
             // same reason as the stage refusal above: they meant to CONFIGURE
             // something, the value was not understood, and it was refused
@@ -858,6 +959,13 @@ export class RuntimeConfigPlugin implements Plugin {
                 }
                 return c.json({
                     cloudUrl: this.cloudUrl,
+                    // Declared by the host, never derived (#14514). Spread,
+                    // not `upgradeUrl: this.upgradeUrl`, for the same reason
+                    // as `branding.stage` below: the contract is asserted on
+                    // KEY PRESENCE and the Console reads "no key" as "no
+                    // link", so a present-and-undefined property must never
+                    // reach a non-JSON consumer or a test.
+                    ...(this.upgradeUrl !== undefined ? { upgradeUrl: this.upgradeUrl } : {}),
                     singleEnvironment: resolvedSingleEnv,
                     defaultOrgId,
                     defaultEnvironmentId,