Add endpoint to add Clack channel

Will be used in upcoming diffs (as demoed on Thursday) to add channel
from UI

Test Plan: Used in upcoming diffs

Reviewers: jwatzman

Reviewed By: jwatzman

Pull Request: #70

Author: Gillian

src/server/handlers/updateChannels.ts

@@ -0,0 +1,51 @@
+import type { ServerUserData } from '@cord-sdk/types';
+import type { Request, Response } from 'express';
+import { fetchCordRESTApi } from 'src/server/fetchCordRESTApi';
+
+export async function handleAddChannel(req: Request, res: Response) {
+  const { user_id: requesterID } = (req as any).loginTokenData;
+  const { channelName } = req.params;
+  const { isPrivate } = req.body;
+
+  // If userIDs is sent, it's a private channel, which means we need to create
+  // an org for its participants.  If no userIDs are sent, it's a public channel
+  // which means it will be associated with the clack_all org.
+
+  if (isPrivate) {
+    await fetchCordRESTApi<
+      Promise<{
+        success: boolean;
+        message: string;
+      }>
+    >(
+      `organizations/${channelName}`,
+      'PUT',
+      JSON.stringify({
+        name: channelName,
+        members: [requesterID],
+      }),
+    );
+  }
+
+  const existingChannels = (
+    await fetchCordRESTApi<ServerUserData>(`users/all_channels_holder`, 'GET')
+  ).metadata;
+
+  const response = await fetchCordRESTApi<
+    Promise<{
+      success: boolean;
+      message: string;
+    }>
+  >(
+    `users/all_channels_holder`,
+    'PUT',
+    JSON.stringify({
+      metadata: {
+        [channelName]: isPrivate ? channelName : '',
+        ...existingChannels,
+      },
+    }),
+  );
+
+  res.send({ success: response.success });
+}

src/server/server.ts

@@ -24,6 +24,7 @@ import {
   handleAddOrgMember,
   handleRemoveOrgMember,
 } from 'src/server/handlers/orgMembers';
+import { handleAddChannel } from 'src/server/handlers/updateChannels';
 
 const REPO_ROOT = path.join(__dirname, '..', '..');
 dotenv.config({ path: path.join(REPO_ROOT, '.env') });
@@ -88,6 +89,8 @@ function main() {
     wrapAsyncHandler(handleRemoveOrgMember),
   );
 
+  app.put('/channels/:channelName', wrapAsyncHandler(handleAddChannel));
+
   // Catch errors and log them
   app.use(
     '/',