Adds ForgivingProjectDataSource

src/composition.ts

@@ -15,6 +15,7 @@ import {
 } from "@/features/projects/data"
 import {
   CachingProjectDataSource,
+  ForgivingProjectDataSource,
   ProjectRepository,
   SessionValidatingProjectDataSource
 } from "@/features/projects/domain"
@@ -175,10 +176,13 @@ export const projectRepository = new ProjectRepository(
 export const projectDataSource = new CachingProjectDataSource(
   new SessionValidatingProjectDataSource(
     sessionValidator,
-    new GitHubProjectDataSource(
-      userGitHubClient,
-      GITHUB_ORGANIZATION_NAME
-    )
+    new ForgivingProjectDataSource({
+      accessTokenReader: accessTokenService,
+      projectDataSource: new GitHubProjectDataSource(
+        userGitHubClient,
+        GITHUB_ORGANIZATION_NAME
+      )
+    })
   ),
   projectRepository
 )

src/features/projects/domain/ForgivingProjectDataSource.ts

@@ -0,0 +1,33 @@
+import Project from "./Project"
+import IProjectDataSource from "./IProjectDataSource"
+
+interface IAccessTokenReader {
+  getAccessToken(): Promise<string>
+}
+
+type ForgivingProjectDataSourceConfig = {
+  readonly accessTokenReader: IAccessTokenReader
+  readonly projectDataSource: IProjectDataSource
+}
+
+export default class ForgivingProjectDataSource implements IProjectDataSource {
+  private readonly accessTokenReader: IAccessTokenReader
+  private readonly projectDataSource: IProjectDataSource
+
+  constructor(config: ForgivingProjectDataSourceConfig) {
+    this.accessTokenReader = config.accessTokenReader
+    this.projectDataSource = config.projectDataSource
+  }
+
+  async getProjects(): Promise<Project[]> {
+    try {
+      await this.accessTokenReader.getAccessToken()
+    } catch {
+      // If we cannot get an access token, we show an empty list of projects.
+      // It is common for guest users that we cannot get an access token because they
+      // have been incorrectly configured to have access to non-existing repositories.
+      return []
+    }
+    return this.projectDataSource.getProjects()
+  }
+}

src/features/projects/domain/index.ts

@@ -1,4 +1,5 @@
 export { default as CachingProjectDataSource } from "./CachingProjectDataSource"
+export { default as ForgivingProjectDataSource } from "./ForgivingProjectDataSource"
 export { default as getSelection } from "./getSelection"
 export type { default as IProjectConfig } from "./IProjectConfig"
 export type { default as IProjectDataSource } from "./IProjectDataSource"