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222 lines
10 KiB
222 lines
10 KiB
/**
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* AppServer serves up the main app.html file to the browser. It is the first point of contact of
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* a browser with Grist. It handles sessions, redirect-to-login, and serving up a suitable version
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* of the client-side code.
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*/
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import * as express from 'express';
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import {ApiError} from 'app/common/ApiError';
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import {getSlugIfNeeded, parseUrlId} from 'app/common/gristUrls';
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import {LocalPlugin} from "app/common/plugin";
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import {TELEMETRY_TEMPLATE_SIGNUP_COOKIE_NAME} from 'app/common/Telemetry';
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import {Document as APIDocument} from 'app/common/UserAPI';
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import {Document} from "app/gen-server/entity/Document";
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import {HomeDBManager} from 'app/gen-server/lib/HomeDBManager';
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import {assertAccess, getTransitiveHeaders, getUserId, isAnonymousUser,
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RequestWithLogin} from 'app/server/lib/Authorizer';
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import {DocStatus, IDocWorkerMap} from 'app/server/lib/DocWorkerMap';
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import {customizeDocWorkerUrl, getWorker, useWorkerPool} from 'app/server/lib/DocWorkerUtils';
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import {expressWrap} from 'app/server/lib/expressWrap';
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import {DocTemplate, GristServer} from 'app/server/lib/GristServer';
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import {getCookieDomain} from 'app/server/lib/gristSessions';
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import {getTemplateOrg} from 'app/server/lib/gristSettings';
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import {getAssignmentId} from 'app/server/lib/idUtils';
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import log from 'app/server/lib/log';
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import {addOrgToPathIfNeeded, pruneAPIResult, trustOrigin} from 'app/server/lib/requestUtils';
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import {ISendAppPageOptions} from 'app/server/lib/sendAppPage';
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export interface AttachOptions {
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app: express.Application; // Express app to which to add endpoints
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middleware: express.RequestHandler[]; // Middleware to apply for all endpoints except docs
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docMiddleware: express.RequestHandler[]; // Middleware to apply for doc landing pages
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forceLogin: express.RequestHandler|null; // Method to force user to login (if logins are possible)
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docWorkerMap: IDocWorkerMap|null;
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sendAppPage: (req: express.Request, resp: express.Response, options: ISendAppPageOptions) => Promise<void>;
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dbManager: HomeDBManager;
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plugins: LocalPlugin[];
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gristServer: GristServer;
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}
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export function attachAppEndpoint(options: AttachOptions): void {
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const {app, middleware, docMiddleware, docWorkerMap, forceLogin,
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sendAppPage, dbManager, plugins, gristServer} = options;
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// Per-workspace URLs open the same old Home page, and it's up to the client to notice and
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// render the right workspace.
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app.get(['/', '/ws/:wsId', '/p/:page'], ...middleware, expressWrap(async (req, res) =>
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sendAppPage(req, res, {path: 'app.html', status: 200, config: {plugins}, googleTagManager: 'anon'})));
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app.get('/api/worker/:assignmentId([^/]+)/?*', expressWrap(async (req, res) => {
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if (!useWorkerPool()) {
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// Let the client know there is not a separate pool of workers,
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// so they should continue to use the same base URL for accessing
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// documents. For consistency, return a prefix to add into that
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// URL, as there would be for a pool of workers. It would be nice
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// to go ahead and provide the full URL, but that requires making
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// more assumptions about how Grist is configured.
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// Alternatives could be: have the client to send their base URL
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// in the request; or use headers commonly added by reverse proxies.
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const selfPrefix = "/dw/self/v/" + gristServer.getTag();
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res.json({docWorkerUrl: null, selfPrefix});
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return;
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}
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if (!trustOrigin(req, res)) { throw new Error('Unrecognized origin'); }
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res.header("Access-Control-Allow-Credentials", "true");
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if (!docWorkerMap) {
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return res.status(500).json({error: 'no worker map'});
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}
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const assignmentId = getAssignmentId(docWorkerMap, req.params.assignmentId);
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const {docStatus} = await getWorker(docWorkerMap, assignmentId, '/status');
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if (!docStatus) {
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return res.status(500).json({error: 'no worker'});
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}
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res.json({docWorkerUrl: customizeDocWorkerUrl(docStatus.docWorker.publicUrl, req)});
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}));
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// Handler for serving the document landing pages. Expects the following parameters:
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// urlId, slug (optional), remainder
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// This handler is used for both "doc/urlId" and "urlId/slug" style endpoints.
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const docHandler = expressWrap(async (req, res, next) => {
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if (req.params.slug && req.params.slug === 'app.html') {
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// This can happen on a single-port configuration, since "docId/app.html" matches
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// the "urlId/slug" pattern. Luckily the "." character is not allowed in slugs.
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return next();
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}
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if (!docWorkerMap) {
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return await sendAppPage(req, res, {path: 'app.html', status: 200, config: {plugins},
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googleTagManager: 'anon'});
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}
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const mreq = req as RequestWithLogin;
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const urlId = req.params.urlId;
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let doc: Document|null = null;
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try {
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const userId = getUserId(mreq);
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// Query DB for the doc metadata, to include in the page (as a pre-fetch of getDoc() call),
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// and to get fresh (uncached) access info.
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doc = await dbManager.getDoc({userId, org: mreq.org, urlId});
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if (isAnonymousUser(mreq) && doc.type === 'tutorial') {
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// Tutorials require users to be signed in.
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throw new ApiError('You must be signed in to access a tutorial.', 403);
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}
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const slug = getSlugIfNeeded(doc);
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const slugMismatch = (req.params.slug || null) !== (slug || null);
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const preferredUrlId = doc.urlId || doc.id;
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if (urlId !== preferredUrlId || slugMismatch) {
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// Prepare to redirect to canonical url for document.
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// Preserve any query parameters or fragments.
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const queryOrFragmentCheck = req.originalUrl.match(/([#?].*)/);
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const queryOrFragment = (queryOrFragmentCheck && queryOrFragmentCheck[1]) || '';
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const target = slug ?
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`/${preferredUrlId}/${slug}${req.params.remainder}${queryOrFragment}` :
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`/doc/${preferredUrlId}${req.params.remainder}${queryOrFragment}`;
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res.redirect(addOrgToPathIfNeeded(req, target));
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return;
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}
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// The docAuth value will be cached from the getDoc() above (or could be derived from doc).
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const docAuth = await dbManager.getDocAuthCached({userId, org: mreq.org, urlId});
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assertAccess('viewers', docAuth);
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} catch (err) {
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if (err.status === 404) {
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log.info("/:urlId/app.html did not find doc", mreq.userId, urlId, doc && doc.access, mreq.org);
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throw new ApiError('Document not found.', 404);
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} else if (err.status === 403) {
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log.info("/:urlId/app.html denied access", mreq.userId, urlId, doc && doc.access, mreq.org);
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// If the user does not have access to the document, and is anonymous, and we
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// have a login system, we may wish to redirect them to login process.
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if (isAnonymousUser(mreq) && forceLogin) {
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// First check if anonymous user has access to this org. If so, we don't propose
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// that they log in. This is the same check made in redirectToLogin() middleware.
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const result = await dbManager.getOrg({userId: getUserId(mreq)}, mreq.org || null);
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if (result.status !== 200 || doc?.type === 'tutorial') {
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// Anonymous user does not have any access to this org, doc, or tutorial.
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// Redirect to log in.
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return forceLogin(req, res, next);
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}
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}
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throw new ApiError('You do not have access to this document.', 403);
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}
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throw err;
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}
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let body: DocTemplate;
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let docStatus: DocStatus|undefined;
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const docId = doc.id;
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if (!useWorkerPool()) {
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body = await gristServer.getDocTemplate();
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} else {
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// The reason to pass through app.html fetched from docWorker is in case it is a different
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// version of Grist (could be newer or older).
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// TODO: More must be done for correct version tagging of URLs: <base href> assumes all
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// links and static resources come from the same host, but we'll have Home API, DocWorker,
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// and static resources all at hostnames different from where this page is served.
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// TODO docWorkerMain needs to serve app.html, perhaps with correct base-href already set.
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const headers = {
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Accept: 'application/json',
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...getTransitiveHeaders(req),
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};
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const workerInfo = await getWorker(docWorkerMap, docId, `/${docId}/app.html`, {headers});
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docStatus = workerInfo.docStatus;
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body = await workerInfo.resp.json();
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}
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const isPublic = ((doc as unknown) as APIDocument).public ?? false;
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const isSnapshot = Boolean(parseUrlId(urlId).snapshotId);
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// TODO: Remove the right side once all template docs have their type set to "template".
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const isTemplate = doc.type === 'template' ||
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(doc.workspace.org.domain === getTemplateOrg() && doc.type !== 'tutorial');
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if (isPublic || isTemplate) {
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gristServer.getTelemetry().logEvent('documentOpened', {
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limited: {
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docIdDigest: docId,
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access: doc.access,
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isPublic,
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isSnapshot,
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isTemplate,
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lastUpdated: doc.updatedAt,
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},
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full: {
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siteId: doc.workspace.org.id,
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siteType: doc.workspace.org.billingAccount.product.name,
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userId: mreq.userId,
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altSessionId: mreq.altSessionId,
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},
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})
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.catch(e => log.error('failed to log telemetry event documentOpened', e));
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}
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if (isTemplate) {
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// Keep track of the last template a user visited in the last hour.
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// If a sign-up occurs within that time period, we'll know which
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// template, if any, was viewed most recently.
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const value = {
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isAnonymous: isAnonymousUser(mreq),
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templateId: docId,
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};
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res.cookie(TELEMETRY_TEMPLATE_SIGNUP_COOKIE_NAME, JSON.stringify(value), {
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maxAge: 1000 * 60 * 60,
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httpOnly: true,
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path: '/',
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domain: getCookieDomain(req),
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sameSite: 'lax',
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});
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}
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await sendAppPage(req, res, {path: "", content: body.page, tag: body.tag, status: 200,
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googleTagManager: 'anon', config: {
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assignmentId: docId,
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getWorker: {[docId]: customizeDocWorkerUrl(docStatus?.docWorker?.publicUrl, req)},
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getDoc: {[docId]: pruneAPIResult(doc as unknown as APIDocument)},
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plugins
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}});
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});
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// The * is a wildcard in express 4, rather than a regex symbol.
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// See https://expressjs.com/en/guide/routing.html
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app.get('/doc/:urlId([^/]+):remainder(*)', ...docMiddleware, docHandler);
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app.get('/:urlId([^/]{12,})/:slug([^/]+):remainder(*)',
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...docMiddleware, docHandler);
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}
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