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The express-generator package helps a lot in the development of web applications with Node, because it generates the skeleton of an application.
A small disadvantage is that, when generating the code, we do not know how to change some very basic things, for example, the port on which the app listens (the default port is 3000).
In this post I will show you how to change the port in some app generated by express-generator. Continue reading…
When we migrate customers from MijoShop to OpenCart there is a little problem: the methods to hash passwords are different and thus when our customers try to login the passwords do not match.
In this post I will show you how to migrate and fix the problem.
Today we will see how to reset the OpenCart password (e-commerce system in PHP) manually, directly in the database; generating the hash and the salt manually with a function created by me.
Here I leave the code, and the explanation at the end.
The function returns an array that has the salt and the password, the way to call it is to pass the password in plain text. You can try and use the function here.
Once you have the salt and the password just do an update of your database table.
In my case:
My table is called oc_user because when I installed OpenCart I used that prefix, in your case it can vary.
Thanks to OpenCart is open source we can see how it generates the salt and saves the hashes.
In its source code it implements obtaining a cryptographically secure random string and then uses sha1 to hash it, concatenating it with the user’s password.
The generation of the salt is as follows:
Generate salt for opencart password
It uses the function called token defined in helpers/general. php and then calls it, obtaining a random string of 9 digits. Then concatenate it and hash it with SHA1:
Hashed OpenCart password with SHA1
Finally, in the database it saves everything in the user table in the salt and password fields:
Salt location and user password in OpenCart database
Knowing all those things we could write a function that generates the salt and the password to be able to reset the password of a user manually in OpenCart.
In this tutorial I will show how to install OpenCart in its version 3 on a server with PHP. You can mount it directly on a server in production, or on your localhost for testing.
In this post we will see how to install Node.Js and NPM (Node package manager) in Android.
At the end we will be able to run Node.js applications as if we had a Linux server.
We will also see how to install dependencies using the npm install command, since it is a possible thing in Android thanks to Termux.
Specifically we will install version 6.9.0 of NPM and version 12.3.1 of node, although perhaps when you read this post you will install a newer version.
This is not a post of those who use tricks to attract visitors, we are really going to install an Apache server on Android, configure it to process PHP files and finally write a Hello World: everything running from our mobile device.
PHP running on Android
Android mobile devices are not designed to be servers (although some of them are powerful), however it is always interesting to see how technology advances and day by day we can do more things with our phones.
Today we will see how to install the MySQL or MariaDB server on Android, thanks to the Termux application. For that it is enough to execute a few simple commands and voila, we will have a MySQL database server in our Android; fully functional and ready to execute queries.
If we want to put it for production, we can do it as long as we configure security. In short, we will not see more advanced topics; we will only see how to install mysql on Android.
Here we will use MariaDB and MySQL as synonyms; that is, if you see that I say MariaDB do not get confused, I mean MySQL; and vice versa.
I know that there are really more differences especially with the licenses, but that is another topic and you can search it in Google if you wish.
Today we will see how to install and configure Termux on Android, as well as a brief introduction to its use.
Termux is an application that will allow us to have a terminal on our device, but apart from that it gives us the possibility of installing very interesting packages; and if we configure them well and install well, we can have a complete and stable server on our mobile.
This application does not require root access, you only need that our Android phone has a recent version (I think it works from Android 6).
In this post we will see how to install and configure the Python interpreter in its version 3 on Windows 10 (works even for 7, 8 and 8.1).
At the end we will be able to execute scripts and also to install third-party libraries using pip; which will make things easier for us.
There is no switch statement in Python, but there are equivalents depending on what you want to achieve. The best-known use of switch is to evaluate a value and avoid nesting multiple if statements.
Today I will explain it: how to make an equivalent switch in Python.
Today we will see how to convert a string in C to uppercase. We will also see how to convert a string to lowercase. That is, to convert something like “Hello World” to “hello world”. Or something like “Good night” to “GOOD NIGHT”.
For this we will use some functions that the standard library has: tolower and toupper.
Sometimes we need to know if an element or value is within a list or array in Python.
There may be a need to simply know if it exists, but it is also possible that we need to obtain the position of an element, that is, its index.
Today we will see how to do it in Python, to check if an element exists in array, as well as to obtain the index of a certain value.
Sometimes we need to create a random string or token using PHP. For example, it’s quite common that when we want to reset our password on some website a message is sent to the mail we registered.
Probably the message have a link like this:
site.com/reset-pass?token=123
Where 123 is the token. Today we will see how to create a token cryptographically secure using PHP. We can use this token as a password or as random string to reset something.
This works for PHP 5 and for PHP 7.
