Add 'revalidate' route, add DIRECTUS_REVALIDATE_KEY

.env.example

@@ -9,3 +9,4 @@
 # Example:
 # SERVERVAR=foo
 # NEXT_PUBLIC_CLIENTVAR=bar
+DIRECTUS_REVALIDATE_KEY=

src/env/schema.mjs

@@ -6,6 +6,7 @@ import { z } from "zod";
  * This way you can ensure the app isn't built with invalid env vars.
  */
 export const serverSchema = z.object({
+  DIRECTUS_REVALIDATE_KEY: z.string(),
   NODE_ENV: z.enum(["development", "test", "production"]),
 });
 

src/pages/api/revalidate.ts

@@ -0,0 +1,102 @@
+import { readItem, readItems } from "@directus/sdk";
+import type { NextApiRequest, NextApiResponse } from "next";
+import { z } from "zod";
+import directus from "../../utils/directus";
+
+async function getURLs(
+  type: string,
+  key: string,
+  payload: Map<string, unknown>,
+): Promise<string[] | null> {
+  if (type == "project_link" || type == "project_technology") {
+    console.error({
+      message: `Failed to provide URls for '${type}' type`,
+      type,
+      key,
+      payload,
+    });
+    return [];
+  }
+
+  if (type === "project") return ["/projects", `/projects/${key}`];
+  if (type === "metadata") return ["/"];
+  if (type === "technology") {
+    const urls = ["/technology"];
+
+    // Get all projects with the technology
+    const all_projects = await directus.request(readItems("project"));
+    if (all_projects != null) {
+      for (const project of all_projects) {
+        if (project.technologies?.some((t) => t.id === key))
+          urls.push(`/projects/${project.id}`);
+      }
+    }
+
+    return urls;
+  }
+
+  if (type === "projects") {
+    const urls = ["/projects", `/projects/${key}`];
+    // TODO: If 'featured', index page should be revalidated
+
+    const project = await directus.request(readItem("project", key));
+    if (project != null) return urls;
+  }
+
+  return null;
+}
+
+const requestSchema = z.object({
+  type: z.string(),
+  keys: z.array(z.string()).min(1),
+  source: z.map(z.string(), z.any()),
+  payload: z.map(z.string(), z.any()),
+});
+
+export default async function handler(
+  req: NextApiRequest,
+  res: NextApiResponse,
+) {
+  if (req.method !== "POST")
+    return res.status(405).json({ message: "Method not allowed" });
+
+  if (
+    req.headers["Authorization"] !==
+    "Bearer " + process.env.DIRECTUS_REVALIDATE_KEY
+  )
+    return res.status(401).json({ message: "Invalid token" });
+
+  try {
+    // Verify JSON body
+    const { success, data } = requestSchema.safeParse(req.body);
+    if (!success) return res.status(400).json({ message: "Invalid JSON body" });
+
+    // Get URLs
+    const urls = await getURLs(data.type, data.keys[0]!, data.payload);
+    if (urls === null)
+      return res
+        .status(404)
+        .json({ revalidated: false, message: "Collection not found" });
+
+    // Revalidate all URLs
+    try {
+      await Promise.all(urls.map((url) => res.revalidate(url)));
+    } catch (error) {
+      console.error({ message: "Error while revalidating", error });
+      return res.status(500).json({
+        revalidated: false,
+        message: "Error while revalidating",
+        urls,
+      });
+    }
+
+    // Return success
+    return res.json({ revalidated: true, urls });
+  } catch (error) {
+    console.error({
+      message: "Error while preparing to revalidate",
+      error,
+    });
+    return res.status(500).send("Error revalidating");
+  }
+}