From 20a0eba2dc2f431e9d0a5832efcc6a97130e91a4 Mon Sep 17 00:00:00 2001
From: Daniel Bachler <daniel@danielbachler.de>
Date: Thu, 10 Oct 2024 14:07:44 +0200
Subject: [PATCH] =?UTF-8?q?=F0=9F=94=A8=20incorporate=20PR=20feedback?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 functions/_common/grapherRenderer.ts       |  8 +++++++-
 functions/_common/readmeTools.ts           |  4 +++-
 functions/grapher/[slug].ts                | 11 -----------
 packages/@ourworldindata/utils/src/Util.ts |  2 ++
 4 files changed, 12 insertions(+), 13 deletions(-)

diff --git a/functions/_common/grapherRenderer.ts b/functions/_common/grapherRenderer.ts
index 1f5b52d27a..5937f2a706 100644
--- a/functions/_common/grapherRenderer.ts
+++ b/functions/_common/grapherRenderer.ts
@@ -54,8 +54,11 @@ export const extensions = {
     configJson: ".config.json",
     png: ".png",
     svg: ".svg",
+    csv: ".csv",
+    metadata: ".metadata.json",
+    readme: ".readme.md",
+    zip: ".zip",
 }
-
 interface ImageOptions {
     pngWidth: number
     pngHeight: number
@@ -454,6 +457,7 @@ function assembleMetadata(grapher: Grapher, searchParams: URLSearchParams) {
                 : attributionShort || titleVariant
         const titleModifier = attributionString ? ` - ${attributionString}` : ""
         const titleLong = `${col.titlePublicOrDisplayName.title}${titleModifier}`
+        const dateDownloaded = new Date()
 
         return [
             useShortNames ? shortName : col.name,
@@ -477,6 +481,8 @@ function assembleMetadata(grapher: Grapher, searchParams: URLSearchParams) {
                 citationShort,
                 citationLong,
                 fullMetadata: `https://api.ourworldindata.org/v1/indicators/${owidVariableId}.metadata.json`,
+                // date downloaded should be YYYY-MM-DD
+                dateDownloaded: dateDownloaded.toISOString().split("T")[0],
             },
         ]
     })
diff --git a/functions/_common/readmeTools.ts b/functions/_common/readmeTools.ts
index c15ff56d3d..1c189706f4 100644
--- a/functions/_common/readmeTools.ts
+++ b/functions/_common/readmeTools.ts
@@ -12,6 +12,7 @@ import {
     getCitationLong,
     prepareSourcesForDisplay,
     uniqBy,
+    formatDate,
 } from "@ourworldindata/utils"
 import { CoreColumn } from "@ourworldindata/core-table"
 import { Grapher } from "@ourworldindata/grapher"
@@ -241,10 +242,11 @@ export function constructReadme(
     const isSingleColumn = columns.length === 1
     const sources = columns.flatMap((col) => [...columnReadmeText(col)])
     let readme: string
+    const downloadDate = formatDate(new Date()) // formats the date as "October 10, 2024"
     if (isSingleColumn)
         readme = `# ${grapher.title} - Data package
 
-This data package contains the data that powers the chart ["${grapher.title}"](${grapher.originUrl}) on the Our World in Data website.
+This data package contains the data that powers the chart ["${grapher.title}"](${grapher.originUrl}) on the Our World in Data website. It was downloaded on ${downloadDate}.
 
 ## CSV Structure
 
diff --git a/functions/grapher/[slug].ts b/functions/grapher/[slug].ts
index 88ae85a52d..25bfb05756 100644
--- a/functions/grapher/[slug].ts
+++ b/functions/grapher/[slug].ts
@@ -16,17 +16,6 @@ import { handleThumbnailRequest } from "../_common/reusableHandlers.js"
 const { preflight, corsify } = cors({
     allowMethods: ["GET", "OPTIONS", "HEAD"],
 })
-// We collect the possible extensions here so we can easily take them into account
-// when handling redirects
-export const extensions = {
-    configJson: ".config.json",
-    png: ".png",
-    svg: ".svg",
-    csv: ".csv",
-    metadata: ".metadata.json",
-    readme: ".readme.md",
-    zip: ".zip",
-}
 
 const router = Router<
     IRequestStrict,
diff --git a/packages/@ourworldindata/utils/src/Util.ts b/packages/@ourworldindata/utils/src/Util.ts
index 96af737892..0500236001 100644
--- a/packages/@ourworldindata/utils/src/Util.ts
+++ b/packages/@ourworldindata/utils/src/Util.ts
@@ -1315,6 +1315,8 @@ export const getIndexableKeys = Object.keys as <T extends object>(
     obj: T
 ) => Array<keyof T>
 
+/** Formats a date like this: "October 10, 2024"
+ */
 export const formatDate = (date: Date): string => {
     return date.toLocaleDateString("en-US", {
         year: "numeric",