Refactor getCommentContext

dotcom-rendering/package.json

@@ -228,7 +228,7 @@
 		"typescript": "5.3.3",
 		"typescript-json-schema": "0.58.1",
 		"unified": "10.1.2",
-		"valibot": "0.26.0",
+		"valibot": "0.28.1",
 		"web-vitals": "3.5.1",
 		"webpack": "5.89.0",
 		"webpack-assets-manifest": "5.1.0",

dotcom-rendering/src/components/Discussion.tsx

@@ -10,11 +10,12 @@ import type {
 	FilterOptions,
 	SignedInUser,
 } from '../lib/discussion';
-import { getDiscussion, type reportAbuse } from '../lib/discussionApi';
 import {
 	getCommentContext,
-	initFiltersFromLocalStorage,
-} from '../lib/getCommentContext';
+	getDiscussion,
+	type reportAbuse,
+} from '../lib/discussionApi';
+import { initFiltersFromLocalStorage } from '../lib/discussionFilters';
 import { palette as themePalette } from '../palette';
 import { Comments } from './Discussion/Comments';
 import { Hide } from './Hide';
@@ -536,10 +537,16 @@ export const Discussion = ({
 				remapToValidFilters(filters, hashCommentId),
 			)
 				.then((context) => {
-					dispatch({
-						type: 'updateCommentPage',
-						commentPage: context.page,
-					});
+					if (context.kind === 'ok') {
+						dispatch({
+							type: 'updateCommentPage',
+							commentPage: context.value.page,
+						});
+					} else {
+						console.error(
+							`getCommentContext - error: ${context.error}`,
+						);
+					}
 				})
 				.catch((e) =>
 					console.error(`getCommentContext - error: ${String(e)}`),

dotcom-rendering/src/lib/discussion.ts

@@ -389,3 +389,15 @@ export type CommentForm = {
 	previewBody: string;
 	body: string;
 };
+
+export const getCommentContextResponseSchema = object({
+	status: literal('ok'),
+	commentId: number(),
+	commentAncestorId: number(),
+	discussionKey: string(),
+	discussionWebUrl: string(),
+	discussionApiUrl: string(),
+	orderBy: picklist(orderBy),
+	pageSize: picklist(pageSize),
+	page: number(),
+});

dotcom-rendering/src/lib/discussionApi.tsx

@@ -9,12 +9,14 @@ import type {
 } from './discussion';
 import {
 	discussionApiResponseSchema,
+	getCommentContextResponseSchema,
 	parseAbuseResponse,
 	parseCommentRepliesResponse,
 	parseCommentResponse,
 	pickResponseSchema,
 	postUsernameResponseSchema,
 } from './discussion';
+import type { CommentContextType } from './discussionFilters';
 import type { SignedInWithCookies, SignedInWithOkta } from './identity';
 import { getOptionsHeadersWithOkta } from './identity';
 import { fetchJSON } from './json';
@@ -436,3 +438,39 @@ export const getMoreResponses = async (
 
 	return parseCommentRepliesResponse(jsonResult.value);
 };
+
+const buildParams = (filters: FilterOptions): URLSearchParams => {
+	return new URLSearchParams({
+		// Frontend uses the 'recommendations' key to store this options but the api expects
+		// 'mostRecommended' so we have to map here to support both
+		orderBy:
+			filters.orderBy === 'recommendations'
+				? 'mostRecommended'
+				: filters.orderBy,
+		pageSize: String(filters.pageSize),
+		displayThreaded: String(
+			filters.threads === 'collapsed' || filters.threads === 'expanded',
+		),
+	});
+};
+
+export const getCommentContext = async (
+	ajaxUrl: string,
+	commentId: number,
+	filters: FilterOptions,
+): Promise<Result<GetDiscussionError, CommentContextType>> => {
+	const url = joinUrl(ajaxUrl, 'comment', commentId.toString(), 'context');
+	const params = buildParams(filters);
+
+	const jsonResult = await fetchJSON(url + '?' + params.toString());
+
+	if (jsonResult.kind === 'error') return jsonResult;
+
+	const result = safeParse(getCommentContextResponseSchema, jsonResult.value);
+
+	if (!result.success) {
+		return error('ParsingError');
+	}
+
+	return ok(result.output);
+};

dotcom-rendering/src/lib/getCommentContext.ts → dotcom-rendering/src/lib/discussionFilters.ts

@@ -1,4 +1,4 @@
-import { isOneOf, isString, joinUrl, storage } from '@guardian/libs';
+import { isOneOf, isString, storage } from '@guardian/libs';
 
 const orderByTypes = ['newest', 'oldest', 'recommendations'] as const;
 const threadTypes = ['collapsed', 'expanded', 'unthreaded'] as const;
@@ -11,8 +11,8 @@ type PageSizeType = (typeof pageSizeTypes)[number];
 /**
  * @see http://discussion.guardianapis.com/discussion-api/comment/3519111/context
  */
-type CommentContextType = {
-	status: 'ok' | 'error';
+export type CommentContextType = {
+	status: 'ok';
 	commentId: number;
 	commentAncestorId: number;
 	discussionKey: string;
@@ -54,46 +54,3 @@ export const initFiltersFromLocalStorage = (): FilterOptions => {
 		pageSize,
 	};
 };
-
-const buildParams = (filters: FilterOptions) => {
-	return new URLSearchParams({
-		// Frontend uses the 'recommendations' key to store this options but the api expects
-		// 'mostRecommended' so we have to map here to support both
-		orderBy:
-			filters.orderBy === 'recommendations'
-				? 'mostRecommended'
-				: filters.orderBy,
-		pageSize: String(filters.pageSize),
-		displayThreaded: String(
-			filters.threads === 'collapsed' || filters.threads === 'expanded',
-		),
-	});
-};
-
-export const getCommentContext = async (
-	ajaxUrl: string,
-	commentId: number,
-	filters: FilterOptions,
-): Promise<CommentContextType> => {
-	const url = joinUrl(ajaxUrl, 'comment', commentId.toString(), 'context');
-
-	const params = buildParams(filters);
-
-	return fetch(url + '?' + params.toString())
-		.then((response) => {
-			if (!response.ok) {
-				throw Error(
-					response.statusText ||
-						`getCommentContext | An api call returned HTTP status ${response.status}`,
-				);
-			}
-			return response;
-		})
-		.then((response) => response.json())
-		.catch((error) => {
-			window.guardian.modules.sentry.reportError(
-				error,
-				'get-comment-page',
-			);
-		});
-};