From 67718df65d2d2b10fd1874a923644c394a3b9fe1 Mon Sep 17 00:00:00 2001
From: Hugo Renard <hugo.renard@protonmail.com>
Date: Tue, 15 Feb 2022 16:16:51 +0100
Subject: [PATCH] add auth

---
 ScimApp.ts                      | 26 ++++++++++++++++----------
 src/endpoints/Context.ts        | 11 +++++++++++
 src/endpoints/ScimEndpoint.ts   | 11 +++++++++--
 src/errors/UnauthorizedError.ts | 13 +++++++++++++
 4 files changed, 49 insertions(+), 12 deletions(-)
 create mode 100644 src/errors/UnauthorizedError.ts

diff --git a/ScimApp.ts b/ScimApp.ts
index 7e784dc..1a6e329 100644
--- a/ScimApp.ts
+++ b/ScimApp.ts
@@ -1,6 +1,7 @@
 import {
     IAppAccessors,
     IConfigurationExtend,
+    IConfigurationModify,
     ILogger,
 } from "@rocket.chat/apps-engine/definition/accessors";
 import {
@@ -9,12 +10,16 @@ import {
 } from "@rocket.chat/apps-engine/definition/api";
 import { App } from "@rocket.chat/apps-engine/definition/App";
 import { IAppInfo } from "@rocket.chat/apps-engine/definition/metadata";
-import { SettingType } from "@rocket.chat/apps-engine/definition/settings";
+import {
+    ISetting,
+    SettingType,
+} from "@rocket.chat/apps-engine/definition/settings";
 import { GroupEndpoint } from "./src/endpoints/GroupEndpoint";
 import { GroupsEndpoint } from "./src/endpoints/GroupsEndpoint";
 
 import { UserEndpoint } from "./src/endpoints/UserEndpoint";
 import { UsersEndpoint } from "./src/endpoints/UsersEndpoint";
+import crypto = require("crypto");
 
 export class ScimApp extends App {
     constructor(info: IAppInfo, logger: ILogger, accessors: IAppAccessors) {
@@ -50,14 +55,15 @@ export class ScimApp extends App {
             public: false,
             i18nLabel: "Rocket.Chat Token",
         });
-    }
 
-    // public async onSettingUpdated(
-    //     setting: ISetting,
-    //     configurationModify: IConfigurationModify,
-    //     read: IRead,
-    //     http: IHttp
-    // ): Promise<void> {
-    //     this.con
-    // }
+        configuration.settings.provideSetting({
+            id: "auth-bearer",
+            type: SettingType.STRING,
+            packageValue: "",
+            required: true,
+            public: false,
+            i18nLabel: "A bearer token to access the SCIM endpoints.",
+            value: crypto.randomBytes(128).toString("base64").slice(0, 128),
+        });
+    }
 }
diff --git a/src/endpoints/Context.ts b/src/endpoints/Context.ts
index c1ed04c..bfddd2e 100644
--- a/src/endpoints/Context.ts
+++ b/src/endpoints/Context.ts
@@ -9,6 +9,7 @@ import {
     IApiRequest,
 } from "@rocket.chat/apps-engine/definition/api";
 import { EmptyRequestError } from "../errors/EmptyRequestError";
+import { UnauthorizedError } from "../errors/UnauthorizedError";
 import { RcSdk } from "../rc-sdk/RcSdk";
 import { Store } from "../store/Store";
 
@@ -52,4 +53,14 @@ export class Context {
         }
         return this.request.content;
     }
+
+    public async checkAuth() {
+        const token = await this.read
+            .getEnvironmentReader()
+            .getSettings()
+            .getValueById("auth-bearer");
+        if (this.request.headers.authorization !== `Bearer ${token}`) {
+            throw new UnauthorizedError();
+        }
+    }
 }
diff --git a/src/endpoints/ScimEndpoint.ts b/src/endpoints/ScimEndpoint.ts
index bdfd269..3e6eae4 100644
--- a/src/endpoints/ScimEndpoint.ts
+++ b/src/endpoints/ScimEndpoint.ts
@@ -118,9 +118,16 @@ export abstract class ScimEndpoint extends ApiEndpoint {
             persis: IPersistence,
         ): Promise<IApiResponse> => {
             try {
-                return await method.bind(this)(
-                    new Context(request, endpoint, read, modify, http, persis),
+                const ctx = new Context(
+                    request,
+                    endpoint,
+                    read,
+                    modify,
+                    http,
+                    persis,
                 );
+                await ctx.checkAuth();
+                return await method.bind(this)(ctx);
             } catch (e) {
                 let err: SCIMError;
                 if (e.toSCIMError && typeof e.toSCIMError === "function") {
diff --git a/src/errors/UnauthorizedError.ts b/src/errors/UnauthorizedError.ts
new file mode 100644
index 0000000..6e2495e
--- /dev/null
+++ b/src/errors/UnauthorizedError.ts
@@ -0,0 +1,13 @@
+import { HttpStatusCode } from "@rocket.chat/apps-engine/definition/accessors";
+import { SCIMError, SCIMErrorType } from "../scim/Error";
+import { BaseError } from "./BaseError";
+
+export class UnauthorizedError extends BaseError {
+    public message = "The bearer token is missing or doesn't match.";
+    public toSCIMError(): SCIMError {
+        return new SCIMError()
+            .setStatus(HttpStatusCode.UNAUTHORIZED)
+            .setScimType(SCIMErrorType.INVALID_SYNTAX)
+            .setDetail(this.message);
+    }
+}