MapComplete/src/UI/InputElement/Validators/FediverseValidator.ts

import {Validator} from "../Validator"
import {Translation} from "../../i18n/Translation";
import Translations from "../../i18n/Translations";

export default class FediverseValidator extends Validator {

    public static readonly usernameAtServer: RegExp = /^@?(\w+)@((\w|\.)+)$/

    constructor() {
        super("fediverse", "Validates fediverse addresses and normalizes them into `@username@server`-format");
    }

    /**
     * Returns an `@username@host`
     * @param s
     */
    reformat(s: string): string {
        if(!s.startsWith("@")){
            s = "@"+s
        }
        if (s.match(FediverseValidator.usernameAtServer)) {
            return s
        }
        try {
            const url = new URL(s)
            const path = url.pathname
            if (path.match(/^\/\w+$/)) {
                return `@${path.substring(1)}@${url.hostname}`;
            }
        } catch (e) {
            // Nothing to do here
        }
        return undefined
    }
getFeedback(s: string): Translation | undefined {
    const match = s.match(FediverseValidator.usernameAtServer)
    console.log("Match:", match)
    if (match) {
        const host = match[2]
        try {
            const url = new URL("https://" + host)
            return undefined
        } catch (e) {
            return Translations.t.validation.fediverse.invalidHost.Subs({host})
        }
    }
    try {
        const url = new URL(s)
        const path = url.pathname
        if (path.match(/^\/\w+$/)) {
            return undefined
        }
    } catch (e) {
        // Nothing to do here
    }
    return Translations.t.validation.fediverse.feedback
}

    isValid(s): boolean {
      return this.getFeedback(s) === undefined

    }
}