The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘JavaScript/ECMAScript’ Category

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Constructing Suffix Trees: Ukkonen’s algorithm – Wikipedia

Posted by jpluimers on 2021/10/12

For my link archive:

I also need to check out [WayBack] Martin Farach-Colton – Wikipedia, as his algorithm is likely more optimised and more versatile.

–jeroen

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Posted in .NET, Algorithms, C#, Development, JavaScript/ECMAScript, Ruby, Scripting, Software Development | Leave a Comment »

For WiFi guest networks with a fixed SSID: QR code – Wikipedia

Posted by jpluimers on 2021/10/06

Access Denied

Access Denied

I knew it was possible to generate QR codes to access quest networks (as the QR code has credentials) for WiFi networks having a fixed SSID.

I just never bothered, but did when needed home care with quite a few different people providing the care.

Generating was easier than I anticipated, though I hoped I just could put the parameters in a URL and fire off to get a page including the QR code.

Alas, the pages I found require you to enter the SSID name and key/password phrase.

That’s OK: I have saved the PNG files for our network and my brother’s as images so I can put them on-line, and printed them out so guests can scan and use the network at once.

Here we go:

  • 124 network Access Denied, key 2171TB24
  • 171 network Disconnected, key 1060NP71

Related:

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Posted in Barcode, Development, Fritz!, Fritz!Box, JavaScript/ECMAScript, Network-and-equipment, Power User, QR code, Scripting, Software Development, Web Development, WiFi | Leave a Comment »

GitHub – metasfresh/metasfresh: We do Open Source ERP – Fast, Flexible & Free Software to scale your Business.

Posted by jpluimers on 2021/09/22

For my link archive: [WayBack] GitHub – metasfresh/metasfresh: We do Open Source ERP – Fast, Flexible & Free Software to scale your Business.

It’s mainly written in JavaScript and Java with a PostgreSQL database and elasticsearch search.

There is plenty of [WayBack] metasfresh documentation (for users, administrators and developers), all with markdown source.

The developer documentation starts with a nice diagram of the [WayBack] metasfresh Architecture:

Markdown source of the architecture page: [WayBack] metasfresh-documentation/metasfresh_architecture.md at gh-pages · metasfresh/metasfresh-documentation · GitHub: Docs and Manuals for Devs, Users, Admins.

Via:

–jeroen

Posted in Development, Java, Java Platform, JavaScript/ECMAScript, Scripting, Software Development | Leave a Comment »

Some links on Flux outside React.js

Posted by jpluimers on 2021/08/24

The Flux architecture is often used in ReactJS, but there are also implementations outside that realm.

So here are some links for my archive:

–jeroen

Posted in .NET, C#, Delphi, Development, JavaScript/ECMAScript, ReactJS, Scripting, Software Development | Leave a Comment »

Where my tweet about testing in production gained me knowledge about the Covid QR code systems

Posted by jpluimers on 2021/07/06

Even though RIVM twitter-care did not respond at all on my raised issue that the production environment leaded an acceptation environment URL, it did gain me some knowledge on their systems and the (then upcoming) European QR code systems.

[Archive.is] Jeroen Wiert Pluimers on Twitter: “Onhandig op de #CoronaCheck site van het @rivm de link hier (1) wijst nog naar de acceptatie omgeving en daar heb je authorisatie voor nodig. Zonder “.acc” werkt het ook niet: (2) Dit werkt wel: (3) CC @locuta… “

  1. web.acc.coronacheck.nl/nl/faq/1-6-welke-informatie-staat-in-mijn-qr-code/
  2. web.coronacheck.nl/nl/faq/1-6-welke-informatie-staat-in-mijn-qr-code/
  3. coronacheck.nl/nl/faq/1-6-welke-informatie-staat-in-mijn-qr-code/

The problem digging into it was that it only reproduces when inside the [Archive.is] Coronacheck Print Portaal after you have logged on via DigiD, so you cannot save it in the WayBack machine nor Archive.is.

This print portal isn’t a straightforward hierarchy of web-pages, but an actual Vue.js app that injects itself into [Wayback/Archive.is] nl-covid19-coronacheck-website/index.html at main · minvws/nl-covid19-coronacheck-website and dynamically changes the URL depending on the application state.

It also means that you cannot archive pages like coronacheck.nl/nl/print/vaccinatie-ophalen or coronacheck.nl/nl/print/keuze-papieren-bewijs as the Vue.js app will not understand state from those sub-URLs and go back to coronacheck.nl/nl/print/

The only other results of [Wayback] “acc.coronacheck.nl” – Google Search were:

Acceptance URLs in production

I had a hunch the CoronaCheck code would be open source, though finding it through the most obvious [Wayback] open source coronacheck app – Google Search failed. Since the web-site and app look very similar to the CoronaMelder web-site and app, I tried [Wayback] open source coronamelder app – Google Search and found the page with links: [Wayback] Colophon – Stop the spread of the coronavirus, download CoronaMelder.

Note that [Wayback] Open-Source Project Corona-Warn-App is a different beast. Though internationally available and released way earlier than the Dutch apps, the Dutch government has a huge ego (maybe even abbreviatable to Hugo) resulting in severe “not invented here” syndrome despite having had to be bailed out when “code black” happened in hospitals.

One thing that I learned is that there is one version of the code behind coronacheck.nl/nl/print/print-vaccinatie in the main branch of github.com/minvws/nl-covid19-coronacheck-website that has only acceptance URLs. They are in these locations:

Apparently, replacing these with production URLs is done during deployment, but I could not find the code that does it in the main repositories at [Wayback] github.com/minvws

European Corona/COVID-19 Green Pass QR certificate

One answer to my tweet was [Archive.is] Joel Haasnoot on Twitter: “gir.st/blog/greenpass.html… “ which provides more information on the European

These are the links I thought were interesting:

–jeroen

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Posted in Development, JavaScript/ECMAScript, Scripting, Software Development, Vue.js, Web Development | Leave a Comment »

Exit Vim 2 Win

Posted by jpluimers on 2021/04/01

[WayBack] Exit Vim 2 Win shows the use of vim.js for a challenge.

Source code at [WayBack] GitHub – idoco/exit-vim-2-win: Exiting vim eventually

–jeroen

Posted in Apri1st, Development, Fun, JavaScript/ECMAScript, Software Development | Leave a Comment »

JSONPlaceholder – Fake online REST API for developers

Posted by jpluimers on 2021/03/25

A great way for testing REST JSON calls is using the [WayBack] JSONPlaceholder – Fake online REST API for developers:

Fake Online REST API for Testing and Prototyping
Serving ~200M requests per month
Powered by JSON Server [WayBack] + LowDB [WayBack]

It is like [WayBack] Placeholder.com: Placeholder Images Done For You [JPG, GIF & PNG] but for JSON and supports both CORS and JSON-P for cross domain requests.

You can either use that site (which has a predefined set of REST calls) or the basic [WayBack] My JSON Server – Fake online REST server for teams that allows you to respond it to a db.json file from github:

Fake Online REST server for teams

Create a JSON file on GitHub

github.com/user/repo/master/db.json
{
  "posts": [
    {
      "id": 1,
      "title": "hello"
    }
  ],
  "profile": {
    "name": "typicode"
  }
}

Get instantly a fake server

my-json-server.typicode.com/user/repo/posts/1
{
  "id": 1,
  "title": "hello"
}

Related

Documentation

There is basic documentation at the repository [WayBack] GitHub – typicode/jsonplaceholder: A simple online fake REST API server:

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Posted in Communications Development, Development, HTTP, Internet protocol suite, JavaScript/ECMAScript, JSON, REST, Scripting, Software Development, TCP | Leave a Comment »

Debouncing and Throttling Explained Through Examples | CSS-Tricks

Posted by jpluimers on 2021/03/10

TL;DR of https://css-tricks.com/debouncing-throttling-explained-examples/:

  • debounce: Grouping a sudden burst of events (like keystrokes) into a single one.
  • throttle: Guaranteeing a constant flow of executions every X milliseconds. Like checking every 200ms your scroll position to trigger a CSS animation.
  • requestAnimationFrame: a throttle alternative. When your function recalculates and renders elements on screen and you want to guarantee smooth changes or animations. Note: no IE9 support.

Full article [WayBack] Debouncing and Throttling Explained Through Examples | CSS-Tricks

Delphi implementations:

–jeroen

Posted in Algorithms, Delphi, Development, JavaScript/ECMAScript, Scripting, Software Development | Leave a Comment »

How do I pretty-print JSON in Delphi? – Stack Overflow

Posted by jpluimers on 2021/02/09

For my archive: the [WayBack] How do I pretty-print JSON in Delphi? – Stack Overflow answer by [WayBack] Bob:

If you do not want to use any external library, and you’re using a Delphi XE5 or newer, there is a very handy TJson.Format() function in the REST.Json unit.

uses json, REST.Json;

{ ... }    

function FormatJSON(json: String): String;
var
  tmpJson: TJsonObject;
begin
  tmpJson := TJSONObject.ParseJSONValue(json);
  Result := TJson.Format(tmpJson);

  FreeAndNil(tmpJson);
end;

–jeroen

Posted in Delphi, Development, JavaScript/ECMAScript, JSON, Scripting, Software Development | 2 Comments »

Spinettaro’s Blog: Delphi Flux application architecture

Posted by jpluimers on 2020/12/16

On my list of things to try: [WayBack] Spinettaro’s Blog: Delphi Flux application architecture.

It is about a Delphi implementation of the Facebook Flux application architecture.

Related:

Via: [WayBack] Delphi Flux application architecture A good application architecture Finding a good application architecture is not easy, but defining an architecture f… – Daniele Spinetti – Google+

Note that by using the [WayBack] CodeRage 2018 Replay | Embarcadero Academy, you are disallowed using any of what you learn in a commercial way.

Embarcadero evangelists told the public that for the Community Edition, similar terms would not be upheld, but then the sales department started sending out nasty emails to people registering Community Edition using their work email address.

[WayBack] https://www.embarcaderoacademy.com/p/terms:

under this license you may not:

  1. modify or copy the materials;
  2. use the materials for any commercial purpose, or for any public display (commercial or non-commercial);
  3. attempt to decompile or reverse engineer any software contained on the School’s web site;
  4. remove any copyright or other proprietary notations from the materials; or
  5. transfer the materials to another person or ‘mirror’ the materials on any other server.

–jeroen

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Posted in Delphi, Development, JavaScript/ECMAScript, Scripting, Software Development, Systems Architecture, TypeScript | Leave a Comment »

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