gristlabs_grist-core/app/server/lib/sendAppPage.ts

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import {Features, getPageTitleSuffix, GristLoadConfig, IFeature} from 'app/common/gristUrls';
import {isAffirmative} from 'app/common/gutil';
import {getTagManagerSnippet} from 'app/common/tagManager';
import {Document} from 'app/common/UserAPI';
import {SUPPORT_EMAIL} from 'app/gen-server/lib/HomeDBManager';
import {isAnonymousUser, RequestWithLogin} from 'app/server/lib/Authorizer';
import {RequestWithOrg} from 'app/server/lib/extractOrg';
import {GristServer} from 'app/server/lib/GristServer';
import {getSupportedEngineChoices} from 'app/server/lib/serverUtils';
import {readLoadedLngs, readLoadedNamespaces} from 'app/server/localization';
import * as express from 'express';
import * as fse from 'fs-extra';
import jsesc from 'jsesc';
import * as handlebars from 'handlebars';
import * as path from 'path';
import difference = require('lodash/difference');
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const translate = (req: express.Request, key: string, args?: any) => req.t(`sendAppPage.${key}`, args);
export interface ISendAppPageOptions {
path: string; // Ignored if .content is present (set to "" for clarity).
content?: string;
status: number;
config: Partial<GristLoadConfig>;
tag?: string; // If present, override version tag.
// If present, enable Google Tag Manager on this page (if GOOGLE_TAG_MANAGER_ID env var is set).
// Used on the welcome page to track sign-ups. We don't intend to use it for in-app analytics.
// Set to true to insert tracker unconditionally; false to omit it; "anon" to insert
// it only when the user is not logged in.
googleTagManager?: true | false | 'anon';
}
export function makeGristConfig(homeUrl: string|null, extra: Partial<GristLoadConfig>,
baseDomain?: string, req?: express.Request
): GristLoadConfig {
// .invalid is a TLD the IETF promises will never exist.
const pluginUrl = process.env.APP_UNTRUSTED_URL || 'http://plugins.invalid';
const pathOnly = (process.env.GRIST_ORG_IN_PATH === "true") ||
(homeUrl && new URL(homeUrl).hostname === 'localhost') || false;
const mreq = req as RequestWithOrg|undefined;
return {
homeUrl,
org: process.env.GRIST_SINGLE_ORG || (mreq && mreq.org),
baseDomain,
singleOrg: process.env.GRIST_SINGLE_ORG,
helpCenterUrl: process.env.GRIST_HELP_CENTER || "https://support.getgrist.com",
pathOnly,
supportAnon: shouldSupportAnon(),
supportEngines: getSupportedEngineChoices(),
features: getFeatures(),
pageTitleSuffix: configuredPageTitleSuffix(),
pluginUrl,
stripeAPIKey: process.env.STRIPE_PUBLIC_API_KEY,
googleClientId: process.env.GOOGLE_CLIENT_ID,
googleDriveScope: process.env.GOOGLE_DRIVE_SCOPE,
helpScoutBeaconId: process.env.HELP_SCOUT_BEACON_ID_V2,
maxUploadSizeImport: (Number(process.env.GRIST_MAX_UPLOAD_IMPORT_MB) * 1024 * 1024) || undefined,
maxUploadSizeAttachment: (Number(process.env.GRIST_MAX_UPLOAD_ATTACHMENT_MB) * 1024 * 1024) || undefined,
timestampMs: Date.now(),
enableWidgetRepository: Boolean(process.env.GRIST_WIDGET_LIST_URL),
survey: Boolean(process.env.DOC_ID_NEW_USER_INFO),
tagManagerId: process.env.GOOGLE_TAG_MANAGER_ID,
activation: getActivation(req as RequestWithLogin | undefined),
enableCustomCss: isAffirmative(process.env.APP_STATIC_INCLUDE_CUSTOM_CSS),
supportedLngs: readLoadedLngs(req?.i18n),
namespaces: readLoadedNamespaces(req?.i18n),
featureComments: isAffirmative(process.env.COMMENTS),
featureFormulaAssistant: isAffirmative(process.env.GRIST_FORMULA_ASSISTANT),
supportEmail: SUPPORT_EMAIL,
userLocale: (req as RequestWithLogin | undefined)?.user?.options?.locale,
...extra,
};
}
/**
* Creates a method that will send html page that will immediately post a message to a parent window.
* Primary used for Google Auth Grist's endpoint, but can be used in future in any other server side
* authentication flow.
*/
export function makeMessagePage(staticDir: string) {
return async (req: express.Request, resp: express.Response, message: any) => {
const fileContent = await fse.readFile(path.join(staticDir, "message.html"), 'utf8');
const content = fileContent.replace(
"<!-- INSERT MESSAGE -->",
`<script>window.message = ${jsesc(message, {isScriptContext: true, json: true})};</script>`
);
resp.status(200).type('html').send(content);
};
}
/**
* Send a simple template page, read from file at pagePath (relative to static/), with certain
* placeholders replaced.
*/
export function makeSendAppPage(opts: {
server: GristServer|null, staticDir: string, tag: string, testLogin?: boolean,
baseDomain?: string
}) {
const {server, staticDir, tag, testLogin} = opts;
return async (req: express.Request, resp: express.Response, options: ISendAppPageOptions) => {
// .invalid is a TLD the IETF promises will never exist.
const config = makeGristConfig(server ? server.getHomeUrl(req) : null, options.config,
opts.baseDomain, req);
// We could cache file contents in memory, but the filesystem does caching too, and compared
// to that, the performance gain is unlikely to be meaningful. So keep it simple here.
const fileContent = options.content || await fse.readFile(path.join(staticDir, options.path), 'utf8');
const needTagManager = (options.googleTagManager === 'anon' && isAnonymousUser(req)) ||
options.googleTagManager === true;
const tagManagerSnippet = needTagManager ? getTagManagerSnippet(process.env.GOOGLE_TAG_MANAGER_ID) : '';
const staticOrigin = process.env.APP_STATIC_URL || "";
const staticBaseUrl = `${staticOrigin}/v/${options.tag || tag}/`;
const customHeadHtmlSnippet = server?.create.getExtraHeadHtml?.() ?? "";
const warning = testLogin ? "<div class=\"dev_warning\">Authentication is not enforced</div>" : "";
// Preload all languages that will be used or are requested by client.
const preloads = req.languages
.filter(lng => (readLoadedLngs(req.i18n)).includes(lng))
.map(lng => lng.replace('-', '_'))
.map((lng) =>
readLoadedNamespaces(req.i18n).map((ns) =>
`<link rel="preload" href="locales/${lng}.${ns}.json" as="fetch" type="application/json" crossorigin>`
).join("\n")
).join('\n');
const content = fileContent
.replace("<!-- INSERT WARNING -->", warning)
.replace("<!-- INSERT TITLE -->", getPageTitle(req, config))
.replace("<!-- INSERT META -->", getPageMetadataHtmlSnippet(config))
.replace("<!-- INSERT TITLE SUFFIX -->", getPageTitleSuffix(server?.getGristConfig()))
.replace("<!-- INSERT BASE -->", `<base href="${staticBaseUrl}">` + tagManagerSnippet)
.replace("<!-- INSERT LOCALE -->", preloads)
.replace("<!-- INSERT CUSTOM -->", customHeadHtmlSnippet)
.replace(
"<!-- INSERT CONFIG -->",
`<script>window.gristConfig = ${jsesc(config, {isScriptContext: true, json: true})};</script>`
);
resp.status(options.status).type('html').send(content);
};
}
function shouldSupportAnon() {
// Enable UI for anonymous access if a flag is explicitly set in the environment
return process.env.GRIST_SUPPORT_ANON === "true";
}
function getFeatures(): IFeature[] {
const disabledFeatures = process.env.GRIST_HIDE_UI_ELEMENTS?.split(',') ?? [];
const enabledFeatures = process.env.GRIST_UI_FEATURES?.split(',') ?? Features.values;
return Features.checkAll(difference(enabledFeatures, disabledFeatures));
}
function configuredPageTitleSuffix() {
const result = process.env.GRIST_PAGE_TITLE_SUFFIX;
return result === "_blank" ? "" : result;
}
/**
* Returns a page title suitable for inserting into an HTML title element.
*
* Currently returns the document name if the page being requested is for a document, or
* a placeholder, "Loading...", that's updated in the client once the page has loaded.
*
* Note: The string returned is escaped and safe to insert into HTML.
*/
function getPageTitle(req: express.Request, config: GristLoadConfig): string {
const maybeDoc = getDocFromConfig(config);
if (!maybeDoc) { return translate(req, 'Loading') + "..."; }
return handlebars.Utils.escapeExpression(maybeDoc.name);
}
/**
* Returns a string representation of 0 or more HTML metadata elements.
*
* Currently includes the document description and thumbnail if the requested page is
* for a document and the document has one set.
*
* Note: The string returned is escaped and safe to insert into HTML.
*/
function getPageMetadataHtmlSnippet(config: GristLoadConfig): string {
const metadataElements: string[] = [];
const maybeDoc = getDocFromConfig(config);
const description = maybeDoc?.options?.description;
if (description) {
const content = handlebars.Utils.escapeExpression(description);
metadataElements.push(`<meta name="description" content="${content}">`);
metadataElements.push(`<meta property="og:description" content="${content}">`);
metadataElements.push(`<meta name="twitter:description" content="${content}">`);
}
const icon = maybeDoc?.options?.icon;
if (icon) {
const content = handlebars.Utils.escapeExpression(icon);
metadataElements.push(`<meta name="thumbnail" content="${content}">`);
metadataElements.push(`<meta property="og:image" content="${content}">`);
metadataElements.push(`<meta name="twitter:image" content="${content}">`);
}
return metadataElements.join('\n');
}
function getDocFromConfig(config: GristLoadConfig): Document | null {
if (!config.getDoc || !config.assignmentId) { return null; }
return config.getDoc[config.assignmentId] ?? null;
}
function getActivation(mreq: RequestWithLogin|undefined) {
const defaultEmail = process.env.GRIST_DEFAULT_EMAIL;
return {
...mreq?.activation,
isManager: Boolean(defaultEmail && defaultEmail === mreq?.user?.loginEmail),
};
}