Merge pull request #14353 from Budibase/license-in-feature-flags

Make it possible to get flag values from the license.

packages/backend-core/src/features/index.ts

@@ -1,12 +1,12 @@
 import env from "../environment"
 import * as context from "../context"
 import { PostHog, PostHogOptions } from "posthog-node"
-import { IdentityType } from "@budibase/types"
+import { IdentityType, UserCtx } from "@budibase/types"
 import tracer from "dd-trace"
 
 let posthog: PostHog | undefined
 export function init(opts?: PostHogOptions) {
-  if (env.POSTHOG_TOKEN) {
+  if (env.POSTHOG_TOKEN && env.POSTHOG_API_HOST) {
     posthog = new PostHog(env.POSTHOG_TOKEN, {
       host: env.POSTHOG_API_HOST,
       ...opts,
@@ -83,40 +83,40 @@ class NumberFlag extends Flag<number> {
 }
 
 export class FlagSet<V extends Flag<any>, T extends { [key: string]: V }> {
-  private readonly flags: T
+  constructor(private readonly flagSchema: T) {}
-
-  constructor(flags: T) {
-    this.flags = flags
-  }
 
   defaults(): FlagValues<T> {
-    return Object.keys(this.flags).reduce((acc, key) => {
+    return Object.keys(this.flagSchema).reduce((acc, key) => {
       const typedKey = key as keyof T
-      acc[typedKey] = this.flags[key].defaultValue
+      acc[typedKey] = this.flagSchema[key].defaultValue
       return acc
     }, {} as FlagValues<T>)
   }
 
   isFlagName(name: string | number | symbol): name is keyof T {
-    return this.flags[name as keyof T] !== undefined
+    return this.flagSchema[name as keyof T] !== undefined
   }
 
-  async get<K extends keyof T>(key: K): Promise<FlagValues<T>[K]> {
+  async get<K extends keyof T>(
-    const flags = await this.fetch()
+    key: K,
+    ctx?: UserCtx
+  ): Promise<FlagValues<T>[K]> {
+    const flags = await this.fetch(ctx)
     return flags[key]
   }
 
-  async isEnabled<K extends KeysOfType<T, boolean>>(key: K): Promise<boolean> {
+  async isEnabled<K extends KeysOfType<T, boolean>>(
-    const flags = await this.fetch()
+    key: K,
+    ctx?: UserCtx
+  ): Promise<boolean> {
+    const flags = await this.fetch(ctx)
     return flags[key]
   }
 
-  async fetch(): Promise<FlagValues<T>> {
+  async fetch(ctx?: UserCtx): Promise<FlagValues<T>> {
     return await tracer.trace("features.fetch", async span => {
       const tags: Record<string, any> = {}
-
+      const flagValues = this.defaults()
-      const flags = this.defaults()
-
       const currentTenantId = context.getTenantId()
       const specificallySetFalse = new Set<string>()
 
@@ -140,39 +140,64 @@ export class FlagSet<V extends Flag<any>, T extends { [key: string]: V }> {
             throw new Error(`Feature: ${feature} is not an allowed option`)
           }
 
-          if (typeof flags[feature] !== "boolean") {
+          if (typeof flagValues[feature] !== "boolean") {
             throw new Error(`Feature: ${feature} is not a boolean`)
           }
 
-          // @ts-ignore
+          // @ts-expect-error - TS does not like you writing into a generic type,
-          flags[feature] = value
+          // but we know that it's okay in this case because it's just an object.
+          flagValues[feature] = value
           tags[`flags.${feature}.source`] = "environment"
         }
       }
 
+      const license = ctx?.user?.license
+      if (license) {
+        for (const feature of license.features) {
+          if (!this.isFlagName(feature)) {
+            continue
+          }
+
+          if (
+            flagValues[feature] === true ||
+            specificallySetFalse.has(feature)
+          ) {
+            // If the flag is already set to through environment variables, we
+            // don't want to override it back to false here.
+            continue
+          }
+
+          // @ts-expect-error - TS does not like you writing into a generic type,
+          // but we know that it's okay in this case because it's just an object.
+          flagValues[feature] = true
+          tags[`flags.${feature}.source`] = "license"
+        }
+      }
+
       const identity = context.getIdentity()
       if (posthog && identity?.type === IdentityType.USER) {
         const posthogFlags = await posthog.getAllFlagsAndPayloads(identity._id)
         for (const [name, value] of Object.entries(posthogFlags.featureFlags)) {
-          const flag = this.flags[name]
+          if (!this.isFlagName(name)) {
-          if (!flag) {
             // We don't want an unexpected PostHog flag to break the app, so we
             // just log it and continue.
             console.warn(`Unexpected posthog flag "${name}": ${value}`)
             continue
           }
 
-          if (flags[name] === true || specificallySetFalse.has(name)) {
+          if (flagValues[name] === true || specificallySetFalse.has(name)) {
             // If the flag is already set to through environment variables, we
             // don't want to override it back to false here.
             continue
           }
 
           const payload = posthogFlags.featureFlagPayloads?.[name]
-
+          const flag = this.flagSchema[name]
           try {
-            // @ts-ignore
+            // @ts-expect-error - TS does not like you writing into a generic
-            flags[name] = flag.parse(payload || value)
+            // type, but we know that it's okay in this case because it's just
+            // an object.
+            flagValues[name] = flag.parse(payload || value)
             tags[`flags.${name}.source`] = "posthog"
           } catch (err) {
             // We don't want an invalid PostHog flag to break the app, so we just
@@ -182,12 +207,12 @@ export class FlagSet<V extends Flag<any>, T extends { [key: string]: V }> {
         }
       }
 
-      for (const [key, value] of Object.entries(flags)) {
+      for (const [key, value] of Object.entries(flagValues)) {
         tags[`flags.${key}.value`] = value
       }
       span?.addTags(tags)
 
-      return flags
+      return flagValues
     })
   }
 }

packages/backend-core/src/features/tests/features.spec.ts

@@ -1,7 +1,7 @@
-import { IdentityContext, IdentityType } from "@budibase/types"
+import { IdentityContext, IdentityType, UserCtx } from "@budibase/types"
 import { Flag, FlagSet, FlagValues, init } from "../"
 import { context } from "../.."
-import { setEnv, withEnv } from "../../environment"
+import environment, { withEnv } from "../../environment"
 import nodeFetch from "node-fetch"
 import nock from "nock"
 
@@ -12,207 +12,214 @@ const schema = {
 }
 const flags = new FlagSet(schema)
 
+interface TestCase {
+  it: string
+  identity?: Partial<IdentityContext>
+  environmentFlags?: string
+  posthogFlags?: PostHogFlags
+  licenseFlags?: Array<string>
+  expected?: Partial<FlagValues<typeof schema>>
+  errorMessage?: string | RegExp
+}
+
+interface PostHogFlags {
+  featureFlags?: Record<string, boolean>
+  featureFlagPayloads?: Record<string, string>
+}
+
+function mockPosthogFlags(flags: PostHogFlags) {
+  nock("https://us.i.posthog.com")
+    .post("/decide/?v=3", body => {
+      return body.token === "test" && body.distinct_id === "us_1234"
+    })
+    .reply(200, flags)
+    .persist()
+}
+
 describe("feature flags", () => {
-  interface TestCase {
+  beforeEach(() => {
-    tenant: string
+    nock.cleanAll()
-    flags: string
+  })
-    expected: Partial<FlagValues<typeof schema>>
-  }
 
   it.each<TestCase>([
     {
-      tenant: "tenant1",
+      it: "should should find a simple boolean flag in the environment",
-      flags: "tenant1:TEST_BOOLEAN",
+      environmentFlags: "default:TEST_BOOLEAN",
       expected: { TEST_BOOLEAN: true },
     },
     {
-      tenant: "tenant1",
+      it: "should should find a simple netgative boolean flag in the environment",
-      flags: "tenant1:!TEST_BOOLEAN",
+      environmentFlags: "default:!TEST_BOOLEAN",
       expected: { TEST_BOOLEAN: false },
     },
     {
-      tenant: "tenant1",
+      it: "should should match stars in the environment",
-      flags: "*:TEST_BOOLEAN",
+      environmentFlags: "*:TEST_BOOLEAN",
       expected: { TEST_BOOLEAN: true },
     },
     {
-      tenant: "tenant1",
+      it: "should not match a different tenant's flags",
-      flags: "tenant2:TEST_BOOLEAN",
+      environmentFlags: "otherTenant:TEST_BOOLEAN",
       expected: { TEST_BOOLEAN: false },
     },
     {
-      tenant: "tenant1",
+      it: "should return the defaults when no flags are set",
-      flags: "",
+      expected: flags.defaults(),
+    },
+    {
+      it: "should fail when an environment flag is not recognised",
+      environmentFlags: "default:TEST_BOOLEAN,default:FOO",
+      errorMessage: "Feature: FOO is not an allowed option",
+    },
+    {
+      it: "should be able to read boolean flags from PostHog",
+      posthogFlags: {
+        featureFlags: { TEST_BOOLEAN: true },
+      },
+      expected: { TEST_BOOLEAN: true },
+    },
+    {
+      it: "should be able to read string flags from PostHog",
+      posthogFlags: {
+        featureFlags: { TEST_STRING: true },
+        featureFlagPayloads: { TEST_STRING: "test" },
+      },
+      expected: { TEST_STRING: "test" },
+    },
+    {
+      it: "should be able to read numeric flags from PostHog",
+      posthogFlags: {
+        featureFlags: { TEST_NUMBER: true },
+        featureFlagPayloads: { TEST_NUMBER: "123" },
+      },
+      expected: { TEST_NUMBER: 123 },
+    },
+    {
+      it: "should not be able to override a negative environment flag from PostHog",
+      environmentFlags: "default:!TEST_BOOLEAN",
+      posthogFlags: {
+        featureFlags: { TEST_BOOLEAN: true },
+      },
+      expected: { TEST_BOOLEAN: false },
+    },
+    {
+      it: "should not be able to override a positive environment flag from PostHog",
+      environmentFlags: "default:TEST_BOOLEAN",
+      posthogFlags: {
+        featureFlags: {
+          TEST_BOOLEAN: false,
+        },
+      },
+      expected: { TEST_BOOLEAN: true },
+    },
+    {
+      it: "should be able to set boolean flags through the license",
+      licenseFlags: ["TEST_BOOLEAN"],
+      expected: { TEST_BOOLEAN: true },
+    },
+    {
+      it: "should not be able to override a negative environment flag from license",
+      environmentFlags: "default:!TEST_BOOLEAN",
+      licenseFlags: ["TEST_BOOLEAN"],
+      expected: { TEST_BOOLEAN: false },
+    },
+    {
+      it: "should not error on unrecognised PostHog flag",
+      posthogFlags: {
+        featureFlags: { UNDEFINED: true },
+      },
+      expected: flags.defaults(),
+    },
+    {
+      it: "should not error on unrecognised license flag",
+      licenseFlags: ["UNDEFINED"],
       expected: flags.defaults(),
     },
   ])(
-    'should find flags $expected for $tenant with string "$flags"',
+    "$it",
-    ({ tenant, flags: envFlags, expected }) =>
+    async ({
-      context.doInTenant(tenant, async () =>
+      identity,
-        withEnv({ TENANT_FEATURE_FLAGS: envFlags }, async () => {
+      environmentFlags,
-          const values = await flags.fetch()
+      posthogFlags,
+      licenseFlags,
+      expected,
+      errorMessage,
+    }) => {
+      const env: Partial<typeof environment> = {
+        TENANT_FEATURE_FLAGS: environmentFlags,
+      }
+
+      if (posthogFlags) {
+        mockPosthogFlags(posthogFlags)
+        env.POSTHOG_TOKEN = "test"
+        env.POSTHOG_API_HOST = "https://us.i.posthog.com"
+      }
+
+      const ctx = { user: { license: { features: licenseFlags || [] } } }
+
+      await withEnv(env, async () => {
+        // We need to pass in node-fetch here otherwise nock won't get used
+        // because posthog-node uses axios under the hood.
+        init({ fetch: nodeFetch })
+
+        const fullIdentity: IdentityContext = {
+          _id: "us_1234",
+          tenantId: "default",
+          type: IdentityType.USER,
+          email: "test@example.com",
+          firstName: "Test",
+          lastName: "User",
+          ...identity,
+        }
+
+        await context.doInIdentityContext(fullIdentity, async () => {
+          if (errorMessage) {
+            await expect(flags.fetch(ctx as UserCtx)).rejects.toThrow(
+              errorMessage
+            )
+          } else if (expected) {
+            const values = await flags.fetch(ctx as UserCtx)
             expect(values).toMatchObject(expected)
 
             for (const [key, expectedValue] of Object.entries(expected)) {
-            const value = await flags.get(key as keyof typeof schema)
+              const value = await flags.get(
+                key as keyof typeof schema,
+                ctx as UserCtx
+              )
               expect(value).toBe(expectedValue)
             }
-        })
+          } else {
-      )
+            throw new Error("No expected value")
-  )
+          }
-
+        })
-  interface FailedTestCase {
+      })
-    tenant: string
-    flags: string
-    expected: string | RegExp
     }
-
-  it.each<FailedTestCase>([
-    {
-      tenant: "tenant1",
-      flags: "tenant1:TEST_BOOLEAN,tenant1:FOO",
-      expected: "Feature: FOO is not an allowed option",
-    },
-  ])(
-    "should fail with message \"$expected\" for $tenant with string '$flags'",
-    ({ tenant, flags: envFlags, expected }) =>
-      context.doInTenant(tenant, () =>
-        withEnv({ TENANT_FEATURE_FLAGS: envFlags }, () =>
-          expect(flags.fetch()).rejects.toThrow(expected)
-        )
-      )
   )
 
-  describe("posthog", () => {
+  it("should not error if PostHog is down", async () => {
     const identity: IdentityContext = {
       _id: "us_1234",
-      tenantId: "tenant1",
+      tenantId: "default",
       type: IdentityType.USER,
       email: "test@example.com",
       firstName: "Test",
       lastName: "User",
     }
 
-    let cleanup: () => void
-
-    beforeAll(() => {
-      cleanup = setEnv({ POSTHOG_TOKEN: "test" })
-    })
-
-    afterAll(() => {
-      cleanup()
-    })
-
-    beforeEach(() => {
-      nock.cleanAll()
-
-      // We need to pass in node-fetch here otherwise nock won't get used
-      // because posthog-node uses axios under the hood.
-      init({ fetch: nodeFetch })
-    })
-
-    function mockFlags(flags: {
-      featureFlags?: Record<string, boolean>
-      featureFlagPayloads?: Record<string, any>
-    }) {
     nock("https://us.i.posthog.com")
       .post("/decide/?v=3", body => {
         return body.token === "test" && body.distinct_id === "us_1234"
       })
-        .reply(200, flags)
+      .reply(503)
-    }
+      .persist()
-
-    it("should be able to read flags from posthog", async () => {
-      mockFlags({
-        featureFlags: {
-          TEST_BOOLEAN: true,
-        },
-      })
-
-      await context.doInIdentityContext(identity, async () => {
-        const values = await flags.fetch()
-        expect(values.TEST_BOOLEAN).toBe(true)
-      })
-    })
-
-    it("should be able to read flags from posthog with payloads", async () => {
-      mockFlags({
-        featureFlags: {
-          TEST_STRING: true,
-        },
-        featureFlagPayloads: {
-          TEST_STRING: "test payload",
-        },
-      })
-
-      await context.doInIdentityContext(identity, async () => {
-        const values = await flags.fetch()
-        expect(values.TEST_STRING).toBe("test payload")
-      })
-    })
-
-    it("should be able to read flags from posthog with numbers", async () => {
-      mockFlags({
-        featureFlags: {
-          TEST_NUMBER: true,
-        },
-        featureFlagPayloads: {
-          TEST_NUMBER: 123,
-        },
-      })
-
-      await context.doInIdentityContext(identity, async () => {
-        const values = await flags.fetch()
-        expect(values.TEST_NUMBER).toBe(123)
-      })
-    })
-
-    it("should not fail when a flag is not known", async () => {
-      mockFlags({
-        featureFlags: {
-          _SOME_RANDOM_FLAG: true,
-        },
-      })
-
-      await context.doInIdentityContext(identity, async () => {
-        await expect(flags.fetch()).resolves.not.toThrow()
-      })
-    })
-
-    it("should not override flags set in the environment", async () => {
-      mockFlags({
-        featureFlags: {
-          TEST_BOOLEAN: false,
-        },
-      })
 
     await withEnv(
-        { TENANT_FEATURE_FLAGS: `${identity.tenantId}:TEST_BOOLEAN` },
+      { POSTHOG_TOKEN: "test", POSTHOG_API_HOST: "https://us.i.posthog.com" },
       async () => {
         await context.doInIdentityContext(identity, async () => {
-            const values = await flags.fetch()
+          await flags.fetch()
-            expect(values.TEST_BOOLEAN).toBe(true)
         })
       }
     )
   })
-
-    it("should not override flags set in the environment with a ! prefix", async () => {
-      mockFlags({
-        featureFlags: {
-          TEST_BOOLEAN: true,
-        },
-      })
-
-      await withEnv(
-        { TENANT_FEATURE_FLAGS: `${identity.tenantId}:!TEST_BOOLEAN` },
-        async () => {
-          await context.doInIdentityContext(identity, async () => {
-            const values = await flags.fetch()
-            expect(values.TEST_BOOLEAN).toBe(false)
-          })
-        }
-      )
-    })
-  })
 })

packages/pro

@@ -1 +1 @@
-Subproject commit 7fe713e51afea77c8024579582a4e1a4ec1b55b3
+Subproject commit 94747fd5bb67c218244bb60b9540f3a6f1c3f6f1