feat(azure): support custom configuration

docs/content/2.deploy/providers/azure.md

@@ -25,6 +25,25 @@ NITRO_PRESET=azure yarn build
 npx @azure/static-web-apps-cli start .output/public --api-location .output/server
 ```
 
+### Configuration
+
+Azure Static Web Apps are [configured](https://learn.microsoft.com/en-us/azure/static-web-apps/configuration) using the `staticwebapp.config.json` file.
+
+Nitro automatically generates this configuration file whenever the application is built with the `azure` preset.
+
+Nitro will automatically add the following properties based on the following criteria:
+| Property | Criteria | Default |
+| --- | --- | --- |
+| **[platform.apiRuntime](https://learn.microsoft.com/en-us/azure/static-web-apps/configuration#platform)** | Will automatically set to `node:16` or `node:14` depending on your package configuration. | `node:16` |
+| **[navigationFallback.rewrite](https://learn.microsoft.com/en-us/azure/static-web-apps/configuration#fallback-routes)** | Is always `/api/server` | `/api/server` |
+| **[routes](https://learn.microsoft.com/en-us/azure/static-web-apps/configuration#routes)** | All prerendered routes are added. Additionally, if you do not have an `index.html` file an empty one is created for you for compatibility purposes and also requests to `/index.html` are redirected to the root directory which is handled by `/api/server`.  | `[]` |
+
+### Custom Configuration
+
+You can alter the Nitro generated configuration using `azure.config` option.
+
+Custom routes will be added and matched first. In the case of a conflict (determined if an object has the same route property), custom routes will override generated ones.
+
 ### Deploy from CI/CD via GitHub Actions
 
 When you link your GitHub repository to Azure Static Web Apps, a workflow file is added to the repository.

src/presets/azure.ts

@@ -41,13 +41,17 @@ async function writeRoutes(nitro: Nitro) {
     }
   }
 
+  // Merge custom config into the generated config
   const config = {
+    ...nitro.options.azure?.config,
+    routes: [], // Overwrite routes for now, we will add existing routes after generating routes
     platform: {
       apiRuntime: `node:${nodeVersion}`,
+      ...nitro.options.azure?.config?.platform,
     },
-    routes: [],
     navigationFallback: {
       rewrite: "/api/server",
+      ...nitro.options.azure?.config?.navigationFallback,
     },
   };
 
@@ -99,6 +103,28 @@ async function writeRoutes(nitro: Nitro) {
     });
   }
 
+  // Prepend custom routes to the beginning of the routes array and override if they exist
+  if (
+    nitro.options.azure?.config &&
+    "routes" in nitro.options.azure.config &&
+    Array.isArray(nitro.options.azure.config.routes)
+  ) {
+    // We iterate through the reverse so the order in the custom config is persisted
+    for (const customRoute of nitro.options.azure.config.routes.reverse()) {
+      const existingRouteMatchIndex = config.routes.findIndex(
+        (value) => value.route === customRoute.route
+      );
+
+      if (existingRouteMatchIndex === -1) {
+        // If we don't find a match, put the customRoute at the beginning of the array
+        config.routes.unshift(customRoute);
+      } else {
+        // Otherwise override the existing route with our customRoute
+        config.routes[existingRouteMatchIndex] = customRoute;
+      }
+    }
+  }
+
   const functionDefinition = {
     entryPoint: "handle",
     bindings: [

src/types/presets.ts

@@ -122,6 +122,20 @@ export interface VercelServerlessFunctionConfig {
   [key: string]: unknown;
 }
 
+interface AzureOptions {
+  config?: {
+    platform?: {
+      apiRuntime?: string;
+      [key: string]: unknown;
+    };
+    navigationFallback?: {
+      rewrite?: string;
+      [key: string]: unknown;
+    };
+    [key: string]: unknown;
+  };
+}
+
 export interface PresetOptions {
   vercel: {
     config: VercelBuildConfigV3;
@@ -166,4 +180,5 @@ export interface PresetOptions {
       defaultRoutes?: boolean;
     };
   };
+  azure: AzureOptions;
 }

test/presets/azure.test.ts

@@ -0,0 +1,150 @@
+import { promises as fsp } from "node:fs";
+import { resolve } from "pathe";
+import { describe, it, expect, beforeEach, afterEach } from "vitest";
+import { fixtureDir, setupTest } from "../tests";
+
+async function attemptToDeleteExistingConfigs() {
+  await fsp
+    .rm(resolve(fixtureDir, "custom.staticwebapp.config.json"))
+    .catch(() => {});
+  await fsp.rm(resolve(fixtureDir, "staticwebapp.config.json")).catch(() => {});
+}
+
+describe("nitro:preset:azure", () => {
+  beforeEach(attemptToDeleteExistingConfigs);
+  afterEach(attemptToDeleteExistingConfigs);
+
+  it("basic staticwebapp.config.json created successfully", async () => {
+    const ctx = await setupTest("azure");
+    const config = await fsp
+      .readFile(resolve(ctx.rootDir, "staticwebapp.config.json"), "utf8")
+      .then((r) => JSON.parse(r));
+    expect(config).toMatchInlineSnapshot(`
+        {
+          "navigationFallback": {
+            "rewrite": "/api/server",
+          },
+          "platform": {
+            "apiRuntime": "node:16",
+          },
+          "routes": [
+            {
+              "rewrite": "/api/hey/index.html",
+              "route": "/api/hey",
+            },
+            {
+              "rewrite": "/prerender/index.html",
+              "route": "/prerender",
+            },
+            {
+              "redirect": "/",
+              "route": "/index.html",
+            },
+            {
+              "rewrite": "/api/server",
+              "route": "/",
+            },
+          ],
+        }
+      `);
+  });
+
+  it("custom configuration applied correctly", async () => {
+    const customConfig = {
+      routes: [
+        {
+          route: "/admin",
+          allowedRoles: ["authenticated"],
+        },
+        {
+          route: "/logout",
+          redirect: "/.auth/logout",
+        },
+        {
+          route: "/index.html",
+          redirect: "/overridden-index",
+        },
+        {
+          route: "/",
+          rewrite: "/api/server/overridden",
+        },
+      ],
+      responseOverrides: {
+        401: {
+          statusCode: 302,
+          redirect: "/.auth/login/aad",
+        },
+      },
+      networking: {
+        allowedIpRanges: ["10.0.0.0/24", "100.0.0.0/32", "192.168.100.0/22"],
+      },
+      platform: {
+        apiRuntime: "custom-runtime",
+      },
+    };
+
+    const ctx = await setupTest("azure", {
+      config: {
+        azure: {
+          config: customConfig,
+        },
+      },
+    });
+
+    const config = await fsp
+      .readFile(resolve(ctx.rootDir, "staticwebapp.config.json"), "utf8")
+      .then((r) => JSON.parse(r));
+
+    expect(config).toMatchInlineSnapshot(`
+        {
+          "navigationFallback": {
+            "rewrite": "/api/server",
+          },
+          "networking": {
+            "allowedIpRanges": [
+              "10.0.0.0/24",
+              "100.0.0.0/32",
+              "192.168.100.0/22",
+            ],
+          },
+          "platform": {
+            "apiRuntime": "custom-runtime",
+          },
+          "responseOverrides": {
+            "401": {
+              "redirect": "/.auth/login/aad",
+              "statusCode": 302,
+            },
+          },
+          "routes": [
+            {
+              "allowedRoles": [
+                "authenticated",
+              ],
+              "route": "/admin",
+            },
+            {
+              "redirect": "/.auth/logout",
+              "route": "/logout",
+            },
+            {
+              "rewrite": "/api/hey/index.html",
+              "route": "/api/hey",
+            },
+            {
+              "rewrite": "/prerender/index.html",
+              "route": "/prerender",
+            },
+            {
+              "redirect": "/overridden-index",
+              "route": "/index.html",
+            },
+            {
+              "rewrite": "/api/server/overridden",
+              "route": "/",
+            },
+          ],
+        }
+      `);
+  });
+});

test/tests.ts

@@ -2,12 +2,12 @@ import { tmpdir } from "node:os";
 import { promises as fsp } from "node:fs";
 import { join, resolve } from "pathe";
 import { listen, Listener } from "listhen";
-import fse from "fs-extra";
 import destr from "destr";
 import { fetch, FetchOptions } from "ofetch";
 import { expect, it, afterAll, beforeAll, describe } from "vitest";
 import { fileURLToPath } from "mlly";
 import { joinURL } from "ufo";
+import { defu } from "defu";
 import * as _nitro from "../src";
 import type { Nitro } from "../src";
 
@@ -37,8 +37,14 @@ export const describeIf = (condition, title, factory) =>
         it.skip("skipped", () => {});
       });
 
-export async function setupTest(preset: string) {
-  const fixtureDir = fileURLToPath(new URL("fixture", import.meta.url).href);
+export const fixtureDir = fileURLToPath(
+  new URL("fixture", import.meta.url).href
+);
+
+export async function setupTest(
+  preset: string,
+  opts: { config?: _nitro.NitroConfig } = {}
+) {
   const presetTempDir = resolve(
     process.env.NITRO_TEST_TMP_DIR || join(tmpdir(), "nitro-tests"),
     preset
@@ -69,32 +75,34 @@ export async function setupTest(preset: string) {
     process.env[name] = value;
   }
 
-  const nitro = (ctx.nitro = await createNitro({
-    preset: ctx.preset,
-    dev: ctx.isDev,
-    rootDir: ctx.rootDir,
-    runtimeConfig: {
-      nitro: {
-        envPrefix: "CUSTOM_",
+  const nitro = (ctx.nitro = await createNitro(
+    defu(opts.config, {
+      preset: ctx.preset,
+      dev: ctx.isDev,
+      rootDir: ctx.rootDir,
+      runtimeConfig: {
+        nitro: {
+          envPrefix: "CUSTOM_",
+        },
+        hello: "",
+        helloThere: "",
       },
-      hello: "",
-      helloThere: "",
-    },
-    buildDir: resolve(fixtureDir, presetTempDir, ".nitro"),
-    serveStatic:
-      preset !== "cloudflare" &&
-      preset !== "cloudflare-module" &&
-      preset !== "cloudflare-pages" &&
-      preset !== "vercel-edge" &&
-      !ctx.isDev,
-    output: {
-      dir: ctx.outDir,
-    },
-    timing:
-      preset !== "cloudflare" &&
-      preset !== "cloudflare-pages" &&
-      preset !== "vercel-edge",
-  }));
+      buildDir: resolve(fixtureDir, presetTempDir, ".nitro"),
+      serveStatic:
+        preset !== "cloudflare" &&
+        preset !== "cloudflare-module" &&
+        preset !== "cloudflare-pages" &&
+        preset !== "vercel-edge" &&
+        !ctx.isDev,
+      output: {
+        dir: ctx.outDir,
+      },
+      timing:
+        preset !== "cloudflare" &&
+        preset !== "cloudflare-pages" &&
+        preset !== "vercel-edge",
+    })
+  ));
 
   if (ctx.isDev) {
     // Setup development server