Pages Plugins

cloudflare · Apr 20, 2022 · 68af1da · 68af1da
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diff --git a/.changeset/cuddly-ears-collect.md b/.changeset/cuddly-ears-collect.md
@@ -0,0 +1,5 @@
+---
+"wrangler": patch
+---
+
+chore: rename `--script-path` to `--outfile` for `wrangler pages functions build` command.
diff --git a/.changeset/spicy-knives-rush.md b/.changeset/spicy-knives-rush.md
@@ -0,0 +1,5 @@
+---
+"wrangler": patch
+---
+
+feature: Adds a `--plugin` option to `wrangler pages functions build` which compiles a Pages Plugin. More information about Pages Plugins can be found [here](https://developers.cloudflare.com/pages/platform/functions/plugins/). This wrangler build is required for both the development of, and inclusion of, plugins.
diff --git a/CODEOWNERS b/CODEOWNERS
@@ -1,2 +1,3 @@
 # Global owners
 * @threepointone @petebacondarwin
+/packages/wrangler/pages/ @GregBrimble
diff --git a/examples/pages-functions-app/CHANGELOG.md b/examples/pages-functions-app/CHANGELOG.md
diff --git a/examples/pages-functions-app/functions/mounted-plugin/_middleware.ts b/examples/pages-functions-app/functions/mounted-plugin/_middleware.ts
@@ -0,0 +1,3 @@
+import examplePlugin from "../../../pages-plugin-example";
+
+export const onRequest = examplePlugin({ footerText: "Set from a Plugin!" });
diff --git a/examples/pages-functions-app/public/index.html b/examples/pages-functions-app/public/index.html
@@ -1 +1,6 @@
-<h1>Hello, world!</h1>
+<!DOCTYPE html>
+<html>
+  <body>
+    <h1>Hello, world!</h1>
+  </body>
+</html>
diff --git a/examples/pages-functions-app/public/some-asset.html b/examples/pages-functions-app/public/some-asset.html
@@ -1 +1,6 @@
-<h1>An asset</h1>
+<!DOCTYPE html>
+<html>
+  <body>
+    <h1>An asset</h1>
+  </body>
+</html>
diff --git a/examples/pages-functions-app/tests/index.test.ts b/examples/pages-functions-app/tests/index.test.ts
@@ -1,4 +1,4 @@
-import { spawn } from "child_process";
+import { spawn, spawnSync } from "child_process";
 import * as path from "path";
 import { fetch } from "undici";
 import type { ChildProcess } from "child_process";
@@ -24,6 +24,12 @@ describe("Pages Functions", () => {
   let wranglerProcess: ChildProcess;
 
   beforeAll(async () => {
+    // spawnSync("npm", ["run", "build"], {
+    //   shell: isWindows,
+    //   cwd: path.resolve(__dirname, "../../pages-plugin-example"),
+    //   env: process.env,
+    // });
+
     wranglerProcess = spawn("npm", ["run", "dev"], {
       shell: isWindows,
       cwd: path.resolve(__dirname, "../"),
@@ -93,4 +99,20 @@ describe("Pages Functions", () => {
     const text = await response.text();
     expect(text).toContain("<h1>An asset</h1>");
   });
+
+  it("can mount a plugin", async () => {
+    // Middleware
+    let response = await waitUntilReady(
+      "http://localhost:8789/mounted-plugin/some-page"
+    );
+    let text = await response.text();
+    expect(text).toContain("<footer>Set from a Plugin!</footer>");
+
+    // Fixed page
+    response = await waitUntilReady(
+      "http://localhost:8789/mounted-plugin/fixed"
+    );
+    text = await response.text();
+    expect(text).toContain("I'm a fixed response");
+  });
 });
diff --git a/examples/pages-plugin-example/.gitignore b/examples/pages-plugin-example/.gitignore
@@ -0,0 +1 @@
+/index.js
diff --git a/examples/pages-plugin-example/functions/_middleware.ts b/examples/pages-plugin-example/functions/_middleware.ts
@@ -0,0 +1,20 @@
+class BodyHandler {
+  footerText: string;
+
+  constructor({ footerText }) {
+    this.footerText = footerText;
+  }
+
+  element(element) {
+    // Don't actually set HTML like this!
+    element.append(`<footer>${this.footerText}</footer>`, { html: true });
+  }
+}
+
+export const onRequest = async ({ next, pluginArgs }) => {
+  const response = await next();
+
+  return new HTMLRewriter()
+    .on("body", new BodyHandler({ footerText: pluginArgs.footerText }))
+    .transform(response);
+};
diff --git a/examples/pages-plugin-example/functions/fixed.ts b/examples/pages-plugin-example/functions/fixed.ts
@@ -0,0 +1,3 @@
+export const onRequest = () => {
+  return new Response("I'm a fixed response");
+};
diff --git a/examples/pages-plugin-example/package.json b/examples/pages-plugin-example/package.json
@@ -0,0 +1,13 @@
+{
+  "name": "pages-plugin-example",
+  "main": "index.js",
+  "types": "index.d.ts",
+  "files": [
+    "index.js",
+    "index.d.ts",
+    "tsconfig.json"
+  ],
+  "scripts": {
+    "build": "npx wrangler pages functions build --plugin --outfile=index.js"
+  }
+}
diff --git a/package.json b/package.json
@@ -37,7 +37,7 @@
     "check:type": "npm run check:type --workspaces --if-present",
     "check:lint": "eslint \"packages/**/*.[tj]s?(x)\" --cache --cache-strategy content --max-warnings=0",
     "check:format": "prettier packages/** .changeset --check --ignore-unknown",
-    "build": "npm run build --workspace=wrangler --workspace=jest-environment-wrangler",
+    "build": "npm run build --workspace=wrangler --workspace=jest-environment-wrangler && npm run build --workspace=pages-plugin-example",
     "test": "npm run test --workspaces --if-present",
     "prettify": "prettier packages/** --write --ignore-unknown"
   },

diff --git a/packages/wrangler/pages/functions/buildPlugin.ts b/packages/wrangler/pages/functions/buildPlugin.ts
@@ -0,0 +1,55 @@
+import { resolve } from "node:path";
+import { build } from "esbuild";
+
+type Options = {
+  routesModule: string;
+  outfile: string;
+  minify?: boolean;
+  sourcemap?: boolean;
+  watch?: boolean;
+  onEnd?: () => void;
+};
+
+export function buildPlugin({
+  routesModule,
+  outfile = "bundle.js",
+  minify = false,
+  sourcemap = false,
+  watch = false,
+  onEnd = () => {},
+}: Options) {
+  return build({
+    entryPoints: [resolve(__dirname, "../pages/functions/template-plugin.ts")],
+    inject: [routesModule],
+    bundle: true,
+    format: "esm",
+    target: "esnext",
+    outfile,
+    minify,
+    sourcemap,
+    watch,
+    allowOverwrite: true,
+    plugins: [
+      {
+        name: "wrangler notifier and monitor",
+        setup(pluginBuild) {
+          pluginBuild.onEnd((result) => {
+            if (result.errors.length > 0) {
+              console.error(
+                `${result.errors.length} error(s) and ${result.warnings.length} warning(s) when compiling Worker.`
+              );
+            } else if (result.warnings.length > 0) {
+              console.warn(
+                `${result.warnings.length} warning(s) when compiling Worker.`
+              );
+              onEnd();
+            } else {
+              console.log("Compiled Worker successfully.");
+              onEnd();
+            }
+          });
+        },
+      },
+    ],
+  });
+}
diff --git a/packages/wrangler/pages/functions/filepath-routing.ts b/packages/wrangler/pages/functions/filepath-routing.ts
@@ -53,6 +53,7 @@ export async function generateConfigFromFileTree({
           let routePath = path
             .relative(baseDir, filepath)
             .slice(0, -ext.length);
+          let mountPath = path.dirname(routePath);
 
           if (isIndexFile || isMiddlewareFile) {
             routePath = path.dirname(routePath);
@@ -61,17 +62,24 @@ export async function generateConfigFromFileTree({
           if (routePath === ".") {
             routePath = "";
           }
+          if (mountPath === ".") {
+            mountPath = "";
+          }
 
           routePath = `${baseURL}/${routePath}`;
+          mountPath = `${baseURL}/${mountPath}`;
 
           routePath = routePath.replace(/\[\[([^\]]+)\]\]/g, ":$1*"); // transform [[id]] => :id*
           routePath = routePath.replaceAll(/\[([^\]]+)\]/g, ":$1"); // transform [id] => :id
+          mountPath = mountPath.replace(/\[\[([^\]]+)\]\]/g, ":$1*"); // transform [[id]] => :id*
+          mountPath = mountPath.replaceAll(/\[([^\]]+)\]/g, ":$1"); // transform [id] => :id
 
           // These are used as module specifiers so UrlPaths are okay to use even on Windows
           const modulePath = toUrlPath(path.relative(baseDir, filepath));
 
           const routeEntry: RouteConfig = {
             routePath: toUrlPath(routePath),
+            mountPath: toUrlPath(mountPath),
             method: method.toUpperCase() as HTTPMethod,
             [isMiddlewareFile ? "middleware" : "module"]: [
               `${modulePath}:${exportName}`,

diff --git a/packages/wrangler/pages/functions/routes.ts b/packages/wrangler/pages/functions/routes.ts
@@ -21,6 +21,7 @@ export function isHTTPMethod(
 
 export type RoutesCollection = Array<{
   routePath: UrlPath;
+  mountPath: UrlPath;
   method?: HTTPMethod;
   modules: string[];
   middlewares: string[];
@@ -33,6 +34,7 @@ export type Config = {
 
 export type RouteConfig = {
   routePath: UrlPath;
+  mountPath: UrlPath;
   method?: HTTPMethod;
   middleware?: string | string[];
   module?: string | string[];
@@ -113,9 +115,11 @@ export function parseConfig(config: Config, baseDir: string) {
     });
   }
 
-  for (const { routePath, method, ...props } of config.routes ?? []) {
+  for (const { routePath, mountPath, method, ...props } of config.routes ??
+    []) {
     routes.push({
       routePath,
+      mountPath,
       method,
       middlewares: parseModuleIdentifiers(props.middleware),
       modules: parseModuleIdentifiers(props.module),
@@ -141,6 +145,7 @@ export const routes = [
     .map(
       (route) => `  {
       routePath: "${route.routePath}",
+      mountPath: "${route.mountPath}",
       method: "${route.method}",
       middlewares: [${route.middlewares.join(", ")}],
       modules: [${route.modules.join(", ")}],