From 52ba35a928291a6ac44d25de93ca5f0cb0fe9847 Mon Sep 17 00:00:00 2001
From: Gregor Martynus <39992+gr2m@users.noreply.github.com>
Date: Fri, 4 Jun 2021 17:03:27 -0700
Subject: [PATCH] fix: make node middleware compatible with `express` (#237)

---
 package-lock.json                 | 435 ++++++++++++++++++++++++++++++
 package.json                      |   1 +
 src/middleware/node/middleware.ts |  13 +-
 test/node-middleware.test.ts      | 128 +++++++++
 4 files changed, 574 insertions(+), 3 deletions(-)

diff --git a/package-lock.json b/package-lock.json
index 03b2e17cb..90a98af3c 100644
--- a/package-lock.json
+++ b/package-lock.json
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+        "debug": "2.6.9",
+        "depd": "~1.1.2",
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+      "version": "1.3.3",
+      "resolved": "https://registry.npmjs.org/parseurl/-/parseurl-1.3.3.tgz",
+      "integrity": "sha512-CiyeOxFT/JZyN5m0z9PfXw4SCBJ6Sygz1Dpl0wqjlhDEGGBP1GnsUVEL0p63hoG1fcj3fHynXi9NYO4nWOL+qQ==",
+      "dev": true
+    },
     "path-exists": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/path-exists/-/path-exists-3.0.0.tgz",
@@ -11696,6 +11987,16 @@
       "integrity": "sha512-vGrhOavPSTz4QVNuBNdcNXePNdNMaO1xj9yBeH1ScQPjk/rhg9sSlCXPhMkFuaNNW/syTvYqsnbIJxMBfRbbag==",
       "dev": true
     },
+    "proxy-addr": {
+      "version": "2.0.7",
+      "resolved": "https://registry.npmjs.org/proxy-addr/-/proxy-addr-2.0.7.tgz",
+      "integrity": "sha512-llQsMLSUDUPT44jdrU/O37qlnifitDP+ZwrmmZcoSKyLKvtZxpyV0n2/bD/N4tBAAZ/gJEdZU7KMraoK1+XYAg==",
+      "dev": true,
+      "requires": {
+        "forwarded": "0.2.0",
+        "ipaddr.js": "1.9.1"
+      }
+    },
     "pseudomap": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/pseudomap/-/pseudomap-1.0.2.tgz",
@@ -11730,6 +12031,12 @@
       "integrity": "sha1-fjL3W0E4EpHQRhHxvxQQmsAGUdc=",
       "dev": true
     },
+    "qs": {
+      "version": "6.7.0",
+      "resolved": "https://registry.npmjs.org/qs/-/qs-6.7.0.tgz",
+      "integrity": "sha512-VCdBRNFTX1fyE7Nb6FYoURo/SPe62QCaAyzJvUjwRaIsc+NePBEniHlvxFmmX56+HZphIGtV0XeCirBtpDrTyQ==",
+      "dev": true
+    },
     "querystring": {
       "version": "0.2.1",
       "resolved": "https://registry.npmjs.org/querystring/-/querystring-0.2.1.tgz",
@@ -11748,6 +12055,24 @@
       "integrity": "sha1-Q2CxfGETatOAeDl/8RQW4Ybc+7g=",
       "dev": true
     },
+    "range-parser": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/range-parser/-/range-parser-1.2.1.tgz",
+      "integrity": "sha512-Hrgsx+orqoygnmhFbKaHE6c296J+HTAQXoxEF6gNupROmmGJRoyzfG3ccAveqCBrwr/2yxQ5BVd/GTl5agOwSg==",
+      "dev": true
+    },
+    "raw-body": {
+      "version": "2.4.0",
+      "resolved": "https://registry.npmjs.org/raw-body/-/raw-body-2.4.0.tgz",
+      "integrity": "sha512-4Oz8DUIwdvoa5qMJelxipzi/iJIi40O5cGV1wNYp5hvZP8ZN0T+jiNkL0QepXs+EsQ9XJ8ipEDoiH70ySUJP3Q==",
+      "dev": true,
+      "requires": {
+        "bytes": "3.1.0",
+        "http-errors": "1.7.2",
+        "iconv-lite": "0.4.24",
+        "unpipe": "1.0.0"
+      }
+    },
     "rc": {
       "version": "1.2.8",
       "resolved": "https://registry.npmjs.org/rc/-/rc-1.2.8.tgz",
@@ -12343,6 +12668,76 @@
       "integrity": "sha512-bXWyL6EAKOJa81XG1OZ/Yyuq+oT0b2YLlxx7c+mrdYPaPbnj6WgVULXhinMIeZGufuUBu/eVRqXEhiv4imfwxA==",
       "dev": true
     },
+    "send": {
+      "version": "0.17.1",
+      "resolved": "https://registry.npmjs.org/send/-/send-0.17.1.tgz",
+      "integrity": "sha512-BsVKsiGcQMFwT8UxypobUKyv7irCNRHk1T0G680vk88yf6LBByGcZJOTJCrTP2xVN6yI+XjPJcNuE3V4fT9sAg==",
+      "dev": true,
+      "requires": {
+        "debug": "2.6.9",
+        "depd": "~1.1.2",
+        "destroy": "~1.0.4",
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "etag": "~1.8.1",
+        "fresh": "0.5.2",
+        "http-errors": "~1.7.2",
+        "mime": "1.6.0",
+        "ms": "2.1.1",
+        "on-finished": "~2.3.0",
+        "range-parser": "~1.2.1",
+        "statuses": "~1.5.0"
+      },
+      "dependencies": {
+        "debug": {
+          "version": "2.6.9",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-2.6.9.tgz",
+          "integrity": "sha512-bC7ElrdJaJnPbAP+1EotYvqZsb3ecl5wi6Bfi6BJTUcNowp6cvspg0jXznRTKDjm/E7AdgFBVeAPVMNcKGsHMA==",
+          "dev": true,
+          "requires": {
+            "ms": "2.0.0"
+          },
+          "dependencies": {
+            "ms": {
+              "version": "2.0.0",
+              "resolved": "https://registry.npmjs.org/ms/-/ms-2.0.0.tgz",
+              "integrity": "sha1-VgiurfwAvmwpAd9fmGF4jeDVl8g=",
+              "dev": true
+            }
+          }
+        },
+        "mime": {
+          "version": "1.6.0",
+          "resolved": "https://registry.npmjs.org/mime/-/mime-1.6.0.tgz",
+          "integrity": "sha512-x0Vn8spI+wuJ1O6S7gnbaQg8Pxh4NNHb7KSINmEWKiPE4RKOplvijn+NkmYmmRgP68mc70j2EbeTFRsrswaQeg==",
+          "dev": true
+        },
+        "ms": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.1.tgz",
+          "integrity": "sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg==",
+          "dev": true
+        }
+      }
+    },
+    "serve-static": {
+      "version": "1.14.1",
+      "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.14.1.tgz",
+      "integrity": "sha512-JMrvUwE54emCYWlTI+hGrGv5I8dEwmco/00EvkzIIsR7MqrHonbD9pO2MOfFnpFntl7ecpZs+3mW+XbQZu9QCg==",
+      "dev": true,
+      "requires": {
+        "encodeurl": "~1.0.2",
+        "escape-html": "~1.0.3",
+        "parseurl": "~1.3.3",
+        "send": "0.17.1"
+      }
+    },
+    "setprototypeof": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.1.1.tgz",
+      "integrity": "sha512-JvdAWfbXeIGaZ9cILp38HntZSFSo3mWg6xGcJJsd+d4aRMOqauag1C63dJfDw7OaMYwEbHMOxEZ1lqVRYP2OAw==",
+      "dev": true
+    },
     "shebang-command": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/shebang-command/-/shebang-command-2.0.0.tgz",
@@ -12527,6 +12922,12 @@
         "mkdirp": "^0.5.1"
       }
     },
+    "statuses": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/statuses/-/statuses-1.5.0.tgz",
+      "integrity": "sha1-Fhx9rBd2Wf2YEfQ3cfqZOBR4Yow=",
+      "dev": true
+    },
     "stream-combiner2": {
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/stream-combiner2/-/stream-combiner2-1.1.1.tgz",
@@ -13020,6 +13421,12 @@
         "is-number": "^7.0.0"
       }
     },
+    "toidentifier": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.0.tgz",
+      "integrity": "sha512-yaOH/Pk/VEhBWWTlhI+qXxDFXlejDGcQipMlyxda9nthulaxLZUNcUqFxokp0vcYnvteJln5FNQDRrxj3YcbVw==",
+      "dev": true
+    },
     "tough-cookie": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-4.0.0.tgz",
@@ -13126,6 +13533,16 @@
       "integrity": "sha512-t0rzBq87m3fVcduHDUFhKmyyX+9eo6WQjZvf51Ea/M0Q7+T374Jp1aUiyUl0GKxp8M/OETVHSDvmkyPgvX+X2w==",
       "dev": true
     },
+    "type-is": {
+      "version": "1.6.18",
+      "resolved": "https://registry.npmjs.org/type-is/-/type-is-1.6.18.tgz",
+      "integrity": "sha512-TkRKr9sUTxEH8MdfuCSP7VizJyzRNMjj2J2do2Jr3Kym598JVdEksuzPQCnlFPW4ky9Q+iA+ma9BGm06XQBy8g==",
+      "dev": true,
+      "requires": {
+        "media-typer": "0.3.0",
+        "mime-types": "~2.1.24"
+      }
+    },
     "typedarray-to-buffer": {
       "version": "3.1.5",
       "resolved": "https://registry.npmjs.org/typedarray-to-buffer/-/typedarray-to-buffer-3.1.5.tgz",
@@ -13196,6 +13613,12 @@
       "integrity": "sha512-rBJeI5CXAlmy1pV+617WB9J63U6XcazHHF2f2dbJix4XzpUF0RS3Zbj0FGIOCAva5P/d/GBOYaACQ1w+0azUkg==",
       "dev": true
     },
+    "unpipe": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
+      "integrity": "sha1-sr9O6FFKrmFltIF4KdIbLvSZBOw=",
+      "dev": true
+    },
     "update-notifier": {
       "version": "3.0.1",
       "resolved": "https://registry.npmjs.org/update-notifier/-/update-notifier-3.0.1.tgz",
@@ -13277,6 +13700,12 @@
       "integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8=",
       "dev": true
     },
+    "utils-merge": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
+      "integrity": "sha1-n5VxD1CiZ5R7LMwSR0HBAoQn5xM=",
+      "dev": true
+    },
     "v8-to-istanbul": {
       "version": "7.1.2",
       "resolved": "https://registry.npmjs.org/v8-to-istanbul/-/v8-to-istanbul-7.1.2.tgz",
@@ -13315,6 +13744,12 @@
         "builtins": "^1.0.3"
       }
     },
+    "vary": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
+      "integrity": "sha1-IpnwLG3tMNSllhsLn3RSShj2NPw=",
+      "dev": true
+    },
     "w3c-hr-time": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/w3c-hr-time/-/w3c-hr-time-1.0.2.tgz",
diff --git a/package.json b/package.json
index 8241a2d6b..032806299 100644
--- a/package.json
+++ b/package.json
@@ -38,6 +38,7 @@
     "@types/jest": "^26.0.0",
     "@types/node": "^14.0.4",
     "@types/node-fetch": "^2.5.4",
+    "express": "^4.17.1",
     "fetch-mock": "^9.0.0",
     "jest": "^27.0.0",
     "nock": "^13.0.0",
diff --git a/src/middleware/node/middleware.ts b/src/middleware/node/middleware.ts
index 2c38fe749..60ea9e234 100644
--- a/src/middleware/node/middleware.ts
+++ b/src/middleware/node/middleware.ts
@@ -14,7 +14,8 @@ export async function middleware(
   app: OAuthApp<Options<ClientType>>,
   options: Required<MiddlewareOptions>,
   request: IncomingMessage,
-  response: ServerResponse
+  response: ServerResponse,
+  next?: Function
 ) {
   // request.url mayb include ?query parameters which we don't want for `route`
   // hence the workaround using new URL()
@@ -32,9 +33,15 @@ export async function middleware(
     deleteGrant: `DELETE ${options.pathPrefix}/grant`,
   };
 
+  // handle unknown routes
   if (!Object.values(routes).includes(route)) {
-    options.onUnhandledRequest(request, response);
-    return;
+    const isExpressMiddleware = typeof next === "function";
+    if (isExpressMiddleware) {
+      // @ts-ignore `next` must be a function as we check two lines above
+      return next();
+    } else {
+      return options.onUnhandledRequest(request, response);
+    }
   }
 
   let parsedRequest;
diff --git a/test/node-middleware.test.ts b/test/node-middleware.test.ts
index 41a677f2a..7f51bf67a 100644
--- a/test/node-middleware.test.ts
+++ b/test/node-middleware.test.ts
@@ -4,6 +4,9 @@ import { URL } from "url";
 import fetch from "node-fetch";
 import { OAuthApp, createNodeMiddleware } from "../src/";
 
+// import without types
+const express = require("express");
+
 describe("createNodeMiddleware(app)", () => {
   it("GET /api/github/oauth/login", async () => {
     const app = new OAuthApp({
@@ -786,4 +789,129 @@ describe("createNodeMiddleware(app)", () => {
       error: '[@octokit/oauth-app] "Authorization" header is required',
     });
   });
+
+  it("express middleware no mount path 404", async () => {
+    const expressApp = express();
+
+    expressApp.use(
+      createNodeMiddleware(
+        new OAuthApp({
+          clientId: "0123",
+          clientSecret: "0123secret",
+        })
+      )
+    );
+    expressApp.all("*", (_request: any, response: any) =>
+      response.status(404).send("Nope")
+    );
+
+    const server = expressApp.listen();
+
+    const { port } = server.address();
+
+    const response = await fetch(`http://localhost:${port}/test`, {
+      method: "POST",
+      body: "{}",
+    });
+
+    await expect(response.text()).resolves.toBe("Nope");
+    expect(response.status).toEqual(404);
+
+    server.close();
+  });
+
+  it("express middleware no mount path no next", async () => {
+    const app = express();
+
+    app.all("/foo", (_request: any, response: any) => response.end("ok\n"));
+    app.use(
+      createNodeMiddleware(
+        new OAuthApp({
+          clientId: "0123",
+          clientSecret: "0123secret",
+        })
+      )
+    );
+
+    const server = app.listen();
+
+    const { port } = server.address();
+
+    const response = await fetch(`http://localhost:${port}/test`, {
+      method: "POST",
+      body: "{}",
+    });
+
+    await expect(response.text()).resolves.toContain("Cannot POST /test");
+    expect(response.status).toEqual(404);
+
+    const responseForFoo = await fetch(`http://localhost:${port}/foo`, {
+      method: "POST",
+      body: "{}",
+    });
+
+    await expect(responseForFoo.text()).resolves.toContain("ok\n");
+    expect(responseForFoo.status).toEqual(200);
+
+    server.close();
+  });
+
+  it("express middleware no mount path with options.pathPrefix", async () => {
+    const app = express();
+
+    app.use(
+      createNodeMiddleware(
+        new OAuthApp({
+          clientId: "0123",
+          clientSecret: "0123secret",
+        }),
+        { pathPrefix: "/test" }
+      )
+    );
+    app.all("*", (_request: any, response: any) =>
+      response.status(404).send("Nope")
+    );
+
+    const server = app.listen();
+
+    const { port } = server.address();
+
+    const { status } = await fetch(`http://localhost:${port}/test/login`, {
+      redirect: "manual",
+    });
+
+    server.close();
+
+    expect(status).toEqual(302);
+  });
+
+  it("express middleware with mount path with options.pathPrefix", async () => {
+    const app = express();
+
+    app.use(
+      "/test",
+      createNodeMiddleware(
+        new OAuthApp({
+          clientId: "0123",
+          clientSecret: "0123secret",
+        }),
+        { pathPrefix: "/test" }
+      )
+    );
+    app.all("*", (_request: any, response: any) =>
+      response.status(404).send("Nope")
+    );
+
+    const server = app.listen();
+
+    const { port } = server.address();
+
+    const { status } = await fetch(`http://localhost:${port}/test/test/login`, {
+      redirect: "manual",
+    });
+
+    server.close();
+
+    expect(status).toEqual(302);
+  });
 });