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BitExpert Blog:
Mattermost Webhooks and PHP
Jul 19, 2017 @ 10:49:26

On the BitExpert blog Stephan Hochdörfer shares his experience working with Mattermost webhooks and interfacing them with backend PHP scripts. Mattermost is an Open Source Slack clone.

In a recent attempt to automate a few things even more, I was looking for a way to post messages to our [Mattermost](http://mattermost.org/) instance via the [Incoming Webhook](https://docs.mattermost.com/developer/webhooks-incoming.html) feature of Mattermost. I did a quick search on [Packagist](https://packagist.org/search/?q=mattermost) for Mattermost client libraries and as it turns out there a quite a few. I picked the [thibaud-dauce/mattermost-php](https://packagist.org/packages/thibaud-dauce/mattermost-php) package simply because it was the first match.

He then walks through the installation of the package and how it works, using Guzzle, to send messages to the Mattermost service. The incoming request is just a JSON-formatted data set, so it's easily parsed in plain PHP. The output, however, needs to be in a format Mattermost understands. That's where the package comes in, providing a "send" method that allows for the customized text and optional attachment to be sent to the Mattermost server.

tagged: mattermost package webhook messaging message tutorial

Link: https://blog.bitexpert.de/blog/mattermost-webhooks-and-php/

CodeIgniter Form Validation: From Start to Finish
Jul 06, 2017 @ 10:53:12

The NetTuts.com site has a new tutorial posted covering form validation in CodeIgniter "from start to finish" showing you how to use the built-in functionality to verify the information coming from your users.

As a web application developer, form validation is a crucial part of your work, and it should not be underrated as it could lead to security flaws in your application. You should consider it a must if you're striving to provide a professional end user experience.

In this article, we'll go through the built-in form validation library in the CodeIgniter framework. Here are the highlights of today's article: [The use of ] basic form validation, cascading and prepping, custom error messages, custom validation callback, and validation configuration

They start off by covering some of the basic included rules using a simple controller and view. These checks include values being required, maximum length of text, alphanumeric only, valid email and checking that the value is a valid IPv4 address. The example also shows how to make use of the "cascading" rules and using the rules system to "prep" the data first. They walk through each line of the code that defines the rules talking about what it does and how they can be adjusted to fit your needs. They cover more in-depth how cascading and prepping work, how to customize error messages and create custom callback validation rules you can apply along with the standard ones.

tagged: codeigniter tutorial validation introduction cascade prep data custom message

Link: https://code.tutsplus.com/tutorials/codeigniter-form-validation-from-start-to-finish--cms-28768

Derick Rethans:
Not Finding the Symbols
Dec 01, 2016 @ 09:58:22

In this new post to his site Derick Rethans about an issue that was discovered with the newer version of the PHP MongoDB driver dealing a JSON encoding/decoding error.

Yesterday we released the new version of the MongoDB Driver for PHP, to coincide with the release of MongoDB 3.4. Not long after that, we received an issue through GitHub titled "Undefined Symbol php_json_serializable_ce in Unknown on Line 0".

The driver makes use of the JSON extension's "JsonSerializable" interface to handle some of the BSON types (like binary data). They were surprised that, despite running their tests on a wide range of builds they never came up with this same issue, compiling them from source. The key here is that the JSON extension is bundled along with the binary when compiled this way however some linux distributions do things differently. They ship it as a separate module and, because this could potentially be missing, a JSON error like the one reported could occur. He goes on to talk about some specific examples from various distributions and the simple fix - ensure the JSON extension is loaded before the MongoDB driver is loaded in your installation. This prevents the JSON handling from being missing and the JSON-related error message from popping up.

tagged: mongodb driver undefined symbol error message extension troubleshoot

Link: https://derickrethans.nl/undefined-symbol.html

Handling Laravel Validation Error Messages With Vue.js
Nov 02, 2016 @ 10:32:28

The Scotch.io blog has posted a new tutorial for the Laravel+Vue.js users out there helping you effectively handle validation error messages output through the Vue.js portion of the application.

Recently, I launched a open source side project I was working on called Open Laravel. Open Laravel allows developers to submit open source projects that were built using the Laravel framework. The project submission page uses Vue.js to submit the form asynchronously through an AJAX request. Since I am no longer sending the form the default way (refreshing after form submission), I needed a way to show Laravel form validation error messages. After going back and forth with some forum questions and answers, I was able to make it work.

The tutorial starts you out with a fresh install of Laravel and runs a npm install to get the Laravel Elixir dependencies. They then add in the other dependencies (like Vue.js itself and the use-resource package). Next up are changes on the Laravel side: adding required routes, setting up a "Posts" controller and making a simple view with the form to take in post content. They provide the Javascript for the Vue.js side as well, making use of the vue-resource to connect the form with the POST request to the backend. Finally they tie in the "FormError" component and have it either show failure messages or success messages when everything's good.

tagged: tutorial vuejs laravel form submit vueresoruce error message

Link: https://scotch.io/tutorials/handling-laravel-validation-error-messages-with-vue-js

Building Your Startup: Notifying People of Meeting Updates
Oct 24, 2016 @ 10:37:50

On TutsPlus.com they've continued their series showing the construction of a startup (a calendaring site) using PHP and the Yii2 framework. In this latest article they walk you through their construction of a notification system when others need to be informed/invited to meetings in the system.

This tutorial is part of the Building Your Startup With PHP series on Envato Tuts+. In this series, I'm guiding you through launching a startup from concept to reality using my Meeting Planner app as a real-life example. [...] In this two-part series, I'll describe how we built the notifications infrastructure and their delivery. Today, I'm going to focus on the MeetingLog to track changes that help us determine when to send updates.

They start with their vision of how the notification system should work (starting at the UI level) and the types of responses an invited user could reply with. The article then gets into how the notifications will work and the creation of the first step: a log to track all actions taken around notifications. They include the model to work with the logging table, adding a new log message, defining the logging command and finding specific log messages. With that in place, the tutorial switches to the frontend, showing what the notifications should look like using flash messages and a few updates to the views in the application.

tagged: startup build tutorial series log message yii2 framework

Link: https://code.tutsplus.com/tutorials/building-your-startup-notifying-people-of-meeting-updates--cms-26594

Laravel News:
Sending and Receiving SMS with Laravel and Nexmo
Aug 05, 2016 @ 12:36:05

On the Laravel News site they've posted a tutorial from Phil Leggetter showing you how to integrate your application with Nexmo to be able to send and receive SMS messages in your Laravel application.

In this quick tutorial by Phil Leggetter, we’ll cover how you can both send and receive SMS from your Laravel application. We’ll do this using Nexmo, a cloud communications platform that offers APIs for provisioning phone numbers, sending and receiving SMS (which is handy since we’ll use that), making and receiving phone calls and more.

He starts off with some prerequisites you'll need to get the system working (including an account on Nexmo and their command line tool). They create a fresh Laravel application and integrate the Nexmo PHP package into it as a service provider. With that installed he shows how to send an SMS message to a phone number, how to "rent" a number they can reply to and receiving the callback when they send a response. The post finishes with the setup of an "auto-responder" that just confirms that the message was received.

tagged: nexmo laravel tutorial integration send receive message rent number

Link: https://laravel-news.com/2016/08/sending-receiving-sms-laravel-nexmo/

Christian Weiske:
PHP: Allowed memory size exhausted
Jul 12, 2016 @ 12:17:20

Christian Weiske has a post to his site with a reminder about a common misconception that can happen because of the wording in a standard PHP message about memory exhaustion.

The indieweb.org wiki has a page about Wordpress with a Criticism section. ?

One of those "issues" listed is Fatal Error memory exhausted [...but] I removed that section because it's nonsense to list a server configuration issue as Criticism.

While the admins reverted the change to put the message back, Christian clarified what meaning of the error message to help clarify the situation. In the case if the example message, the "32 bytes" it mentions is not the amount of total memory it's trying to allocate, it's the amount it last tried and failed at. Christian also points out the role that PHP's own memory_limit setting has on when this message might pop up.

tagged: allowed memory size exhausted error message clarification

Link: http://cweiske.de/tagebuch/php-memory-exhausted.htm

SitePoint PHP Blog:
Using Halite for Privacy and Two-Way Encryption of Emails
Jun 23, 2016 @ 11:18:17

On the SitePoint PHP blog there's a new tutorial posted showing you how to use the Halite package to encrypt the contents of emails. The Halite library sits on top of the libsodium functionality to provide tested, hardened cryptographic results.

Cryptography is a complex matter. In fact, there is one golden rule: "Don’t implement cryptography yourself." The reason for this is that so many things can go wrong while implementing it, the slightest error can generate a vulnerability and if you look away, your precious data can be read by someone else.

[...] Some libraries out there implement cryptography primitives and operations, and leave a lot of decisions to the developer. [...] Nevertheless, there is one library that stands out from the rest for its simplicity and takes a lot of responsibility from the developer on the best practices, in addition to using the libsodium library. In this article we are going to explore Halite.

The tutorial then starts of helping you get the libsodium package installed on your system (assuming it's unix-based). They then start on the sample application - a basic "email" client able to send/receive messages between users. They set up RESTful endpoints to get the messages, use the Doctrine ORM for a database interface and show the use of the Halite Crypto class to encrypt/decrypt the message contents.

tagged: halite privacy twoway encryption email message tutorial libsodium

Link: https://www.sitepoint.com/using-halite-for-privacy-and-two-way-encryption-of-emails/

Rob Allen:
Slim 3.4.0 now provides PSR-7!
May 09, 2016 @ 09:48:10

Rob Allen has a post to his site announcing the latest release of the Slim Framework - v3.4.0 - and an update that allows for full PSR-7 support, telling Composer that the framework fully supports it now as well.

I've been neglecting Slim's PR queue recently, so this weekend I dedicated a lot of time to merging all the good work that our contributors have done. As a result, I'm delighted to release version 3.4.0! This release has a larger set of changes in it than I would have ideally liked which is a direct consequence of having gone two months between releases rather than one.

One particularly interesting addition that we have a made this release is adding a provide section to our composer.json file. [...] This means that we have informed Composer that Slim provides a valid implementation of the interfaces in psr/http-message-implementation virtual package that defines the PSR-7 interfaces.

This basically means that if you're using other libraries/tools that require a PSR-7 compatible system to work correctly, they'll detect that Slim fully supports it.

tagged: slimframework slim3 psr7 support http message implementation composer

Link: https://akrabat.com/slim-3-4-0-now-provides-psr-7/

Ibuildings Blog:
Programming Guidelines - Part 4: Messages
Feb 17, 2016 @ 11:19:17

Ibuildings has posted the fourth part of their "Programming Guidelines" series to their blog, sharing even more helpful hints and tips you can apply to your everyday development. In this new post author Matthias Noback talks about messaging in your application, not in output to the user but in the communication between parts of your system.

In the previous parts of this series we looked at how to get rid of complexity at the level of algorithms. After discussing the problem of nulls in your code, we looked at object lifecycles and how to encapsulate them properly. Now that we have objects that can be constructed and changed only in valid ways, we need to look at how they communicate with each other and how we can improve our code with regard to that aspect.

He then breaks up the rest of the article into a few sections:

  • Object communication
  • Message categories
  • Command/Query Separation Principle
  • Implementing commands
  • Queries
  • Documents
  • Command query responsibility segregation
  • Events

For each section a description of the topic is provided and a bit of sample code is included to help illustrate the change/functionality.

tagged: programming guideline part4 series message object tutorial

Link: https://www.ibuildings.nl/blog/2016/02/programming-guidelines-part-4-messages