swaf/src/components/NunjucksComponent.ts

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import nunjucks, {Environment} from "nunjucks";
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import config from "config";
import {Express, Request, Router} from "express";
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import ApplicationComponent from "../ApplicationComponent";
import Controller from "../Controller";
import {ServerError} from "../HttpError";
import * as querystring from "querystring";
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export default class NunjucksComponent extends ApplicationComponent<void> {
public static getPreviousURL(req: Request, defaultUrl?: string): string {
return req.query.redirect_uri?.toString() || req.headers.referer?.[0] || defaultUrl || '/';
}
private readonly viewsPath: string;
private env?: Environment;
constructor(viewsPath: string = 'views') {
super();
this.viewsPath = viewsPath;
}
public async start(app: Express): Promise<void> {
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let coreVersion = 'unknown';
try {
coreVersion = require('../../package.json').version;
} catch (e) {
try {
coreVersion = require('../package.json').version;
} catch (e) {
}
}
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this.env = nunjucks.configure([
this.viewsPath,
'views',
'node_modules/wms-core/views'
], {
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autoescape: true,
express: app,
noCache: !config.get('view.cache'),
throwOnUndefined: true,
})
.addGlobal('route', (route: string, params: { [p: string]: string } | [] = [], absolute: boolean = false) => {
const path = Controller.route(route, params, absolute);
if (path === null) throw new ServerError(`Route ${route} not found.`);
return path;
})
.addGlobal('app_version', this.app!.getVersion())
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.addGlobal('core_version', coreVersion)
.addGlobal('querystring', querystring)
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.addFilter('hex', (v: number) => {
return v.toString(16);
});
app.set('view engine', 'njk');
}
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public async init(router: Router): Promise<void> {
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router.use((req, res, next) => {
req.env = this.env!;
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res.locals.url = req.url;
res.locals.params = () => req.params;
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res.locals.app = config.get('app');
// Redirect back
res.redirectBack = (defaultUrl?: string) => {
res.redirect(NunjucksComponent.getPreviousURL(req, defaultUrl));
};
res.locals.getPreviousURL = (defaultURL?: string) => {
return NunjucksComponent.getPreviousURL(req, defaultURL);
};
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next();
});
}
}