/
SubdomainExtensionBasedMapper.ts
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/
SubdomainExtensionBasedMapper.ts
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import { toASCII, toUnicode } from 'punycode/';
import type { ResourceIdentifier } from '../../http/representation/ResourceIdentifier';
import { ForbiddenHttpError } from '../../util/errors/ForbiddenHttpError';
import { InternalServerError } from '../../util/errors/InternalServerError';
import { NotFoundHttpError } from '../../util/errors/NotFoundHttpError';
import {
decodeUriPathComponents,
encodeUriPathComponents,
ensureTrailingSlash,
createSubdomainRegexp,
extractScheme,
trimTrailingSlashes,
} from '../../util/PathUtil';
import { ExtensionBasedMapper } from './ExtensionBasedMapper';
/**
* Extends the functionality of an {@link ExtensionBasedMapper} to support identifiers containing subdomains.
* This is mostly only relevant in case you want to support multiple pods with subdomain identifiers
* in a single ResourceStore.
*
* When converting to/from file paths, the subdomain is interpreted as a folder in the rootFilePath.
* The rest of the path is then interpreted relative to that folder.
* E.g. `http://alice.test.com/foo` results in the relative path `/alice/foo`.
*
* In case there is no subdomain in the URL, the `baseSubdomain` parameter is used instead.
* E.g., if the `baseSubdomain` is "www", `http://test.com/foo` would result in the relative path `/www/foo`.
* This means that there is no identifier that maps to the `rootFilePath` itself.
* To prevent the possibility of 2 identifiers linking to the same file,
* identifiers containing the default subdomain are rejected.
* E.g., `http://www.test.com/foo` would result in a 403, even if `http://test.com/foo` exists.
*/
export class SubdomainExtensionBasedMapper extends ExtensionBasedMapper {
private readonly baseSubdomain: string;
private readonly regex: RegExp;
private readonly baseParts: { scheme: string; rest: string };
public constructor(base: string, rootFilepath: string, baseSubdomain = 'www',
customTypes?: Record<string, string>) {
super(base, rootFilepath, customTypes);
this.baseSubdomain = baseSubdomain;
this.regex = createSubdomainRegexp(ensureTrailingSlash(base));
this.baseParts = extractScheme(ensureTrailingSlash(base));
}
protected async getContainerUrl(relative: string): Promise<string> {
return ensureTrailingSlash(this.relativeToUrl(relative));
}
protected async getDocumentUrl(relative: string): Promise<string> {
relative = this.stripExtension(relative);
return trimTrailingSlashes(this.relativeToUrl(relative));
}
/**
* Converts a relative path to a URL.
* Examples assuming http://test.com/ is the base url and `www` the base subdomain:
* * /www/foo gives http://test.com/foo
* * /alice/foo/ gives http://alice.test.com/foo/
*/
protected relativeToUrl(relative: string): string {
const match = /^\/([^/]+)\/(.*)$/u.exec(relative);
if (!Array.isArray(match)) {
throw new InternalServerError(`Illegal relative path ${relative}`);
}
const tail = encodeUriPathComponents(match[2]);
if (match[1] === this.baseSubdomain) {
return `${this.baseRequestURI}/${tail}`;
}
return `${this.baseParts.scheme}${toASCII(match[1])}.${this.baseParts.rest}${tail}`;
}
/**
* Gets the relative path as though the subdomain url is the base, and then prepends it with the subdomain.
* Examples assuming http://test.com/ is the base url and `www` the base subdomain:
* * http://test.com/foo gives /www/foo
* * http://alice.test.com/foo/ gives /alice/foo/
*/
protected getRelativePath(identifier: ResourceIdentifier): string {
const match = this.regex.exec(identifier.path);
if (!Array.isArray(match)) {
this.logger.warn(`The URL ${identifier.path} is outside of the scope ${this.baseRequestURI}`);
throw new NotFoundHttpError();
}
// Otherwise 2 different identifiers would be able to access the same resource
if (match[1] === this.baseSubdomain) {
throw new ForbiddenHttpError(`Subdomain ${this.baseSubdomain} can not be used.`);
}
const tail = `/${decodeUriPathComponents(identifier.path.slice(match[0].length))}`;
const subdomain = match[1] ? toUnicode(match[1]) : this.baseSubdomain;
return `/${subdomain}${tail}`;
}
}