(core) make Grist easier to run with a single server

Summary:
This makes many small changes so that Grist is less fussy to run as a single instance behind a reverse proxy. Some users had difficulty with the self-connections Grist would make, due to internal network setup, and since these are unnecessary in any case in this scenario, they are now optimized away. Likewise some users had difficulties related to doc worker urls, which are now also optimized away. With these changes, users should be able to get a lot further on first try, at least far enough to open and edit documents.

The `GRIST_SINGLE_ORG` setting was proving a bit confusing, since it appeared to only work when set to `docs`. This diff
adds a check for whether the specified org exists, and if not, it creates it. This still depends on having a user email to make as the owner of the team, so there could be remaining difficulties there.

Test Plan: tested manually with nginx

Reviewers: jarek

Reviewed By: jarek

Differential Revision: https://phab.getgrist.com/D3299

stubs/app/server/server.ts

@@ -5,6 +5,7 @@
  */
 
 import {isAffirmative} from 'app/common/gutil';
+import {HomeDBManager} from 'app/gen-server/lib/HomeDBManager';
 
 const debugging = isAffirmative(process.env.DEBUG) || isAffirmative(process.env.VERBOSE);
 
@@ -22,6 +23,12 @@ setDefaultEnv('GRIST_SERVE_SAME_ORIGIN', 'true');
 setDefaultEnv('GRIST_SINGLE_PORT', 'true');
 setDefaultEnv('GRIST_DEFAULT_PRODUCT', 'Free');
 
+if (!process.env.GRIST_SINGLE_ORG) {
+  // org identifiers in domains are fiddly to configure right, so by
+  // default don't do that.
+  setDefaultEnv('GRIST_ORG_IN_PATH', 'true');
+}
+
 import {updateDb} from 'app/server/lib/dbUtils';
 import {main as mergedServerMain} from 'app/server/mergedServerMain';
 import * as fse from 'fs-extra';
@@ -46,14 +53,49 @@ export async function main() {
   }
 
   // If SAML is not configured, there's no login system, so provide a default email address.
-  if (!process.env.GRIST_SAML_SP_HOST && !process.env.GRIST_TEST_LOGIN) {
-    setDefaultEnv('GRIST_DEFAULT_EMAIL', 'you@example.com');
-  }
+  setDefaultEnv('GRIST_DEFAULT_EMAIL', 'you@example.com');
   // Set directory for uploaded documents.
   setDefaultEnv('GRIST_DATA_DIR', 'docs');
   await fse.mkdirp(process.env.GRIST_DATA_DIR!);
   // Make a blank db if needed.
   await updateDb();
+  // If a team/organization is specified, make sure it exists.
+  const org = process.env.GRIST_SINGLE_ORG;
+  if (org && org !== 'docs') {
+    const db = new HomeDBManager();
+    await db.connect();
+    await db.initializeSpecialIds({skipWorkspaces: true});
+    try {
+      db.unwrapQueryResult(await db.getOrg({
+        userId: db.getPreviewerUserId(),
+        includeSupport: false,
+      }, org));
+    } catch(e) {
+      if (!String(e).match(/organization not found/)) {
+        throw e;
+      }
+      const email = process.env.GRIST_DEFAULT_EMAIL;
+      if (!email) {
+        throw new Error('need GRIST_DEFAULT_EMAIL to create site');
+      }
+      const user = await db.getUserByLogin(email, {
+        email,
+        name: email,
+      });
+      if (!user) {
+        // This should not happen.
+        throw new Error('failed to create GRIST_DEFAULT_EMAIL user');
+      }
+      await db.addOrg(user, {
+        name: org,
+        domain: org,
+      }, {
+        setUserAsOwner: false,
+        useNewPlan: true,
+        planType: 'free'
+      });
+    }
+  }
   // Launch single-port, self-contained version of Grist.
   const server = await mergedServerMain(G.port, ["home", "docs", "static"]);
   if (process.env.GRIST_TESTING_SOCKET) {