fix(ota): include Expo config in manifests

apps/ota/src/__tests__/manifest.test.ts

@@ -85,6 +85,41 @@ describe("buildManifest", () => {
 
     expect(first.id).toBe(second.id)
   })
+
+  it("includes the embedded Expo config needed by expo-constants after an OTA launch", () => {
+    const manifest = buildManifest(createRelease(), {
+      origin: "https://ota.folo.is",
+      platform: "ios",
+    })
+
+    expect(manifest.extra).toMatchObject({
+      expoClient: {
+        name: "Folo",
+        slug: "follow",
+        owner: "follow",
+        scheme: ["follow", "folo"],
+        version: "0.4.2",
+        runtimeVersion: "0.4.1",
+        updates: {
+          url: "https://ota.folo.is/manifest",
+          requestHeaders: {
+            "expo-channel-name": "production",
+          },
+        },
+        ios: {
+          bundleIdentifier: "is.follow",
+        },
+        android: {
+          package: "is.follow",
+        },
+        extra: {
+          eas: {
+            projectId: "a6335b14-fb84-45aa-ba80-6f6ab8926920",
+          },
+        },
+      },
+    })
+  })
 })
 
 describe("/manifest", () => {

apps/ota/src/lib/manifest.ts

@@ -5,6 +5,43 @@ import type { OtaPlatform, OtaPlatformPayload, OtaProjectedPlatforms, OtaRelease
 
 type PlatformPayload = OtaPlatformPayload
 type PlatformAsset = PlatformPayload["launchAsset"] | PlatformPayload["assets"][number]
+type MobileExpoClientConfig = {
+  name: string
+  slug: string
+  owner: string
+  version: string
+  runtimeVersion: string
+  orientation: "portrait"
+  scheme: string[]
+  userInterfaceStyle: "automatic"
+  updates: {
+    url: string
+    requestHeaders: {
+      "expo-channel-name": string
+    }
+    codeSigningMetadata: {
+      keyid: string
+      alg: string
+    }
+    checkAutomatically: "NEVER"
+  }
+  ios: {
+    bundleIdentifier: string
+    supportsTablet: boolean
+    usesAppleSignIn: boolean
+  }
+  android: {
+    package: string
+  }
+  extra: {
+    eas: {
+      projectId: string
+    }
+  }
+}
+
+const MOBILE_UPDATE_URL = "https://ota.folo.is/manifest"
+const MOBILE_EAS_PROJECT_ID = "a6335b14-fb84-45aa-ba80-6f6ab8926920"
 
 export interface ManifestAsset {
   key: string
@@ -26,6 +63,7 @@ export interface OtaManifest {
   }
   extra: {
     product: OtaRelease["product"]
+    expoClient?: MobileExpoClientConfig
   }
 }
 
@@ -62,9 +100,7 @@ export function buildManifest(
       channel: release.channel,
       releaseVersion: release.releaseVersion,
     },
-    extra: {
-      product: release.product,
-    },
+    extra: buildManifestExtra(release),
   }
 }
 
@@ -142,6 +178,56 @@ function toExpoAssetIdentity(path: string, contentType: string) {
   }
 }
 
+function buildManifestExtra(release: OtaRelease): OtaManifest["extra"] {
+  const extra: OtaManifest["extra"] = {
+    product: release.product,
+  }
+
+  if (release.product === "mobile") {
+    // Expo Updates hydrates Constants.expoConfig from extra.expoClient after an OTA launch.
+    extra.expoClient = buildMobileExpoClientConfig(release)
+  }
+
+  return extra
+}
+
+function buildMobileExpoClientConfig(release: Extract<OtaRelease, { product: "mobile" }>) {
+  return {
+    name: "Folo",
+    slug: "follow",
+    owner: "follow",
+    version: release.releaseVersion,
+    runtimeVersion: release.runtimeVersion,
+    orientation: "portrait",
+    scheme: ["follow", "folo"],
+    userInterfaceStyle: "automatic",
+    updates: {
+      url: MOBILE_UPDATE_URL,
+      requestHeaders: {
+        "expo-channel-name": release.channel,
+      },
+      codeSigningMetadata: {
+        keyid: "main",
+        alg: "rsa-v1_5-sha256",
+      },
+      checkAutomatically: "NEVER",
+    },
+    ios: {
+      bundleIdentifier: "is.follow",
+      supportsTablet: true,
+      usesAppleSignIn: true,
+    },
+    android: {
+      package: "is.follow",
+    },
+    extra: {
+      eas: {
+        projectId: MOBILE_EAS_PROJECT_ID,
+      },
+    },
+  } satisfies MobileExpoClientConfig
+}
+
 function inferExtensionFromContentType(contentType: string) {
   switch (contentType) {
     case "application/javascript": {