Add endpoint for rce config

Refs: QUIZ-9944
flag=none
Test plan:
  - Run canvas and canvas-rce-api locally
  - Send a get request to http://rce.docker/api/rceConfig with a correct auth token, contextType and contextId parameters
  - Note that the endpoint returns the exact same body that canvas returns from /api/v1/services/rce_config

Change-Id: Ib8fd747f7b46b87b523ab58a4a2cbece97174603
Reviewed-on: https://gerrit.instructure.com/c/canvas-rce-api/+/300728
Tested-by: Service Cloud Jenkins <[email protected]>
Reviewed-by: Rajmund Csehil <[email protected]>
Reviewed-by: Viktor Szpisják <[email protected]>
QA-Review: Rajmund Csehil <[email protected]>
Product-Review: Rajmund Csehil <[email protected]>

app/api/index.js

@@ -11,6 +11,7 @@ const assignments = require("./assignments");
 const discussions = require("./discussions");
 const modules = require("./modules");
 const quizzes = require("./quizzes");
+const rceConfig = require("./rceConfig");
 const wikiPages = require("./wikiPages");
 const kaltura = require("./kaltura");
 const media_objects = require("./mediaObjects");
@@ -61,6 +62,12 @@ function init(auth, unsplashController) {
         auth,
         wrapCanvas(quizzes)
       );
+      app.get(
+        "/api/rceConfig",
+        statsdKey("api", "rceConfig"),
+        auth,
+        wrapCanvas(rceConfig)
+      );
       app.get(
         "/api/wikiPages",
         statsdKey("api", "wikiPages"),

app/api/rceConfig.js

@@ -0,0 +1,23 @@
+"use strict";
+
+function canvasPath(request) {
+  if (!request.query.contextId)
+    throw new Error("missing contextId parameter from query param");
+
+  const queryParamName = (contextType => {
+    switch (contextType) {
+      case "course":
+        return "course_id";
+      case "user":
+        return "user_id";
+      case "group":
+        return "group_id";
+      default:
+        throw new Error(`invalid contextType (${request.query.contextType})`);
+    }
+  })(request.query.contextType);
+
+  return `/api/v1/services/rce_config?${queryParamName}=${request.query.contextId}`;
+}
+
+module.exports = { canvasPath };

test/service/api/rceConfig.test.js

@@ -0,0 +1,44 @@
+"use strict";
+
+const assert = require("assert");
+
+const { canvasPath } = require("../../../app/api/rceConfig");
+
+describe("RCE config API", () => {
+  describe("canvasPath", () => {
+    it("builds the correct path including with course_id parameter", () => {
+      const path = canvasPath({
+        query: { contextType: "course", contextId: "1" }
+      });
+      assert.ok(path.match("/api/v1/services/rce_config\\?course_id=1"));
+    });
+
+    it("builds the correct path including with user_id parameter", () => {
+      const path = canvasPath({
+        query: { contextType: "user", contextId: "1" }
+      });
+      assert.ok(path.match("/api/v1/services/rce_config\\?user_id=1"));
+    });
+
+    it("builds the correct path including with group_id parameter", () => {
+      const path = canvasPath({
+        query: { contextType: "group", contextId: "1" }
+      });
+      assert.ok(path.match("/api/v1/services/rce_config\\?group_id=1"));
+    });
+
+    it("throws error in case of missing context type", () => {
+      assert.throws(() => canvasPath({ query: { contextId: "1" } }));
+    });
+
+    it("throws error in case of invalid context type", () => {
+      assert.throws(() =>
+        canvasPath({ query: { contextType: "asd", contextId: "1" } })
+      );
+    });
+
+    it("throws error in case of missing context id", () => {
+      assert.throws(() => canvasPath({ query: { contextType: "asd" } }));
+    });
+  });
+});