reusable generateOAuthState helper, introduce in InspectorOAuthClientProvider and in oauth-state-machine, add test

client/src/utils/__tests__/oauthUtils.test.ts

@@ -0,0 +1,86 @@
+import {
+  generateOAuthErrorDescription,
+  parseOAuthCallbackParams,
+  generateOAuthState,
+} from "@/utils/oauthUtils.ts";
+
+describe("parseOAuthCallbackParams", () => {
+  it("Returns successful: true and code when present", () => {
+    expect(parseOAuthCallbackParams("?code=fake-code")).toEqual({
+      successful: true,
+      code: "fake-code",
+    });
+  });
+  it("Returns successful: false and error when error is present", () => {
+    expect(parseOAuthCallbackParams("?error=access_denied")).toEqual({
+      successful: false,
+      error: "access_denied",
+      error_description: null,
+      error_uri: null,
+    });
+  });
+  it("Returns optional error metadata fields when present", () => {
+    const search =
+      "?error=access_denied&" +
+      "error_description=User%20Denied%20Request&" +
+      "error_uri=https%3A%2F%2Fexample.com%2Ferror-docs";
+    expect(parseOAuthCallbackParams(search)).toEqual({
+      successful: false,
+      error: "access_denied",
+      error_description: "User Denied Request",
+      error_uri: "https://example.com/error-docs",
+    });
+  });
+  it("Returns error when nothing present", () => {
+    expect(parseOAuthCallbackParams("?")).toEqual({
+      successful: false,
+      error: "invalid_request",
+      error_description: "Missing code or error in response",
+      error_uri: null,
+    });
+  });
+});
+
+describe("generateOAuthErrorDescription", () => {
+  it("When only error is present", () => {
+    expect(
+      generateOAuthErrorDescription({
+        successful: false,
+        error: "invalid_request",
+        error_description: null,
+        error_uri: null,
+      }),
+    ).toBe("Error: invalid_request.");
+  });
+  it("When error description is present", () => {
+    expect(
+      generateOAuthErrorDescription({
+        successful: false,
+        error: "invalid_request",
+        error_description: "The request could not be completed as dialed",
+        error_uri: null,
+      }),
+    ).toEqual(
+      "Error: invalid_request.\nDetails: The request could not be completed as dialed.",
+    );
+  });
+  it("When all fields present", () => {
+    expect(
+      generateOAuthErrorDescription({
+        successful: false,
+        error: "invalid_request",
+        error_description: "The request could not be completed as dialed",
+        error_uri: "https://example.com/error-docs",
+      }),
+    ).toEqual(
+      "Error: invalid_request.\nDetails: The request could not be completed as dialed.\nMore info: https://example.com/error-docs.",
+    );
+  });
+
+  describe("generateOAuthState", () => {
+    it("Returns a string", () => {
+      expect(generateOAuthState()).toBeDefined();
+      expect(generateOAuthState()).toHaveLength(64);
+    });
+  });
+});