tag:blogger.com,1999:blog-46905343612738372182025-12-16T21:08:26.094+01:00Notes about programming on iPhone, iPad, C#, PHP, data science and other things.Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.comBlogger80125tag:blogger.com,1999:blog-4690534361273837218.post-52781307224377454592019-09-02T21:08:00.002+02:002019-09-02T21:08:31.116+02:00

Well, easy problem to solve. Just edit/create the SSH config file ~/.ssh/config and add the two providers Host github HostName github.com IdentityFile ~/.ssh/github Host gitlab HostName gilab.com IdentityFile ~/.ssh/gitlab changing/defining your SSH keys for each provider. Go to Github config area and Gitlab config area and add your PUBLIC key (normally something like id_rsa.pub) to the

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-88412427634734123602019-08-31T21:13:00.001+02:002019-08-31T21:13:57.768+02:00

Let's start checking the dependencies, considering that I am using for this example spring boot 2.1.7. Go to your build.gradle file and in the section dependencies be sure that you have the following: compile 'org.springframework.boot:spring-boot-starter-jdbc' compile 'org.postgresql:postgresql:42.2.2' If you still don't have the resources.config.application.yml file, create it or edit it

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-40672088031897245022017-03-08T11:23:00.002+01:002017-03-08T11:24:22.177+01:00

Today we I going to show how to set up HTTP Strict Transport Security (HSTS) in NGINX to improve slightly the security of your webapp. HTTPS (HTTP encrypted with SSL or TLS) makes very difficult for an attacker to intercept, modify, or fake traffic between a user and the website. HSTS seeks to deal with potential vulnerabilities by instructing the browser that a domain can only be accessed

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-22262908070797176372016-09-29T16:05:00.000+02:002016-09-29T16:06:40.075+02:00

We will install kafka for PHP based on the libraries: https://github.com/EVODelavega/phpkafka https://github.com/edenhill/librdkafka Setting up ========== Fast way (Only Ubuntu) -------- $ sudo apt-get install librdkafka1 Dependencies ------------ First let install some dependencies (installing manually) $ sudo apt-get install libsasl2-dev liblz4-dev Installing php-rdkafka (Other OS) ----

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-61982470698659457002016-09-04T13:35:00.002+02:002016-09-04T13:43:30.873+02:00

How to run Laravel 5.3 in a 1and1 shared hosting 1.- Go to your Control Panel and set the default PHP version to 5.6 for your current domain. 2.- Artisan script Open artisan file and replace the first line to: #!/usr/local/bin/php5.5 which corresponds to the 1and1 php5.5 path. Now you can run artisan using ./artisan. 3.- composer.json Open composer.json file and replace all the php

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-26033608404064448062016-08-03T16:59:00.002+02:002016-08-03T17:01:03.229+02:00

Today let's explain how to download a file from S3 using laravel. Next time I will explain how to upload the file. 1) Set up the bucket name. Ex. YOUR_BUCKET_NAME 2) Set up the bucket policy {   "Id": "PolicyXXXXXX",   "Version": "2012-10-17",   "Statement": [     {       "Sid": "XXXXXX",       "Action": [  &

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-26330677579657679612016-03-01T15:12:00.000+01:002016-03-01T15:46:34.202+01:00

Capistrano for Laravel 5 in Ubuntu Install Capistrano in Ubuntu gem install capistrano SSH access Capistrano deploys using SSH. Thus, you must be able to SSH from the deployment system to the destination system for Capistrano to work. You can test the SSH connection using a ssh client, e.g. ssh your_username@destinationserver If you cannot connect, in order to be able to do this

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-58645812719987117442016-02-29T17:46:00.001+01:002016-02-29T17:47:31.079+01:00

Many times we want to store our constants/config details into a different file to simplify the deployment process or simply to organise the code. Here you can see a very basic way to save your app's config file into a different location. https://jsfiddle.net/sergioloppe/bvajr7bw/ The code is self-explanatory. Hope helps

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-61382446672200697462016-02-12T15:11:00.002+01:002016-02-12T15:11:09.350+01:00

Sometimes when you have to evaluate some mathematical expressions with eval it is difficult to control the errors even using try-catch. Here you have a trick to solve that problem: $calculation = '1/0'; $result = @eval($calculation . "; return true;"); if($result) { $rule2_val = doubleval(@eval($calculation)); } else { return 'Impossible to perform the calculation'; } Hope helps!

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-52448952872103717282016-01-24T13:44:00.001+01:002016-01-24T13:44:45.944+01:00

As you know, long time ago, Illuminate/Html was remove from laravel because it is not a core feature. Today I need to use Form for one of my projects and I am going to show how to include in Laravel 5.2. (I prefer not to use Form but you never know). 1) Add to composer.json "illuminate/html": "5.*" 2) Update your project composer update 3) Edit the file config/app.php and add to providers

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com1tag:blogger.com,1999:blog-4690534361273837218.post-73301085884323137282016-01-13T13:43:00.001+01:002016-01-13T13:43:36.366+01:00

Today is the day to deploy things and... also the day to set up the Github's two-factor authentication on the command line. In order to be able to work with your repositories once you set up your w-factor authentication follow the next steps: Log into your Github account and go to Settings Select the "Personal Access Tokens" tab on the left-hand navigation Click on "Generate new" personal

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-13796553817341416352016-01-03T18:04:00.000+01:002016-01-05T17:03:30.815+01:00

To install Ruby on Rails in a Ubuntu Vagrant Box in a Mac follow the steps below: 1) Download and install vagrant and virtualbox   - http://www.vagrantup.com/downloads   - https://www.virtualbox.org/wiki/Downloads 2) Install the Ubuntu box # vagrant init ubuntu/trusty64 4) Set up the forwarding # vi Vagrantfile Add the line in the forwarded port mapping config.vm.network "

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-41754574624714654772015-12-11T14:09:00.000+01:002015-12-11T14:10:20.146+01:00

Today I show how to add a timestamp to your log files in your bash scripts. That is easy. In this solution we have to include the function adddate() {     while IFS= read -r line; do         echo "$(date) $line"     done } in your script file and add pipe the command to the function using the systax: command | adddate For example: #!/bin/bash

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-56905880559455827192015-08-21T16:33:00.000+02:002015-08-21T16:33:17.548+02:00

What happens if you are using Laravel and PostgrSQL and you have to connect to multiple schemas. This post shows how to solve this problem easily in a few steps: 1) Create a new connection in the file app/config/database.php. For example the "test" connection linked to the "your_schema" schema. ... 'connections' => [ ... 'test' => [ 'driver'   => 'pgsql', '

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-40634753132865643882015-06-15T20:52:00.003+02:002015-06-15T20:53:14.845+02:00

Many times we want to apply some method or we need an algorithm but we don't have the time to implemented or simply we don't know how to do it. For this situations is good to know how to look for the best or more standardized packages that R offered. Here is my trick. Install the package "sos" Use the function findFn to find the related packages to a given topic. Let's first install the

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-32812773883091951052015-06-15T14:34:00.001+02:002015-06-15T14:47:52.317+02:00

Something common in R is to have two vectors representing a key-value dictionary, for example: Car name Car price Let's see an example: We created two vectors using the dataset "car.test.frame" included in the package rpart. The first vector contains the name of the cars (key) and the second vector the list of prices (value). The function "match" is used to look for a couple of cars

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-64629929187096454232015-06-09T10:28:00.003+02:002015-06-09T10:30:20.435+02:00

In the last release of Chrome something was wrong printing canvas contents. To see the problem visit the website: https://developers.google.com/maps/documentation/javascript/examples/circle-simple Do you see the circles on the map? Print the page Observe the differents with the printing version. Do you see the circles?  If the answer is not, this post solves your problem. We can

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-92085664873144724412015-02-11T17:02:00.002+01:002015-02-11T17:02:20.635+01:00

Loading speed is a common problem considering that your website is downloading again and  again the same files (css, js, png,...). Let's load a couple of modules: mod_expires mod_header The idea is to use the max-age header parameter which lets us says "this file expires 1 week from today", which is simpler than setting an explicit date. The max-age is measured in seconds, ie. 1 day =

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-38004371663570478322014-10-27T22:27:00.000+01:002014-10-27T22:27:24.322+01:00

Imagine you need to connect from your browser to another computer which has access to an specific service, por example a private control panel. How to do it using SSH on a mac? Well, lets describe the problem: I want to access to the Service 192.168.300.12:11801 which can be accesed only from the Server SSH 192.168.200.1. To increase the complexity of the problem, we should use HTTPS to

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-20855593682288367362014-10-27T17:32:00.001+01:002014-10-27T17:37:06.019+01:00

A friend asked me today about how to normalize a range into another one. Well, given a range from A to B we want to convert it to a scale of C to D, where A maps to C and b maps to D, and we want to do it with a linear function. For example, if C=1 and D=5, ie, interval [1,5], that means that A maps 1 and B maps 5. The following linear equation does exactly what we need f(x) = 1 + (x-A)*(5-1

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-2451219961673467012014-10-24T13:08:00.000+02:002014-10-24T13:09:40.414+02:00

The Statistical Classification of Economic Activities in the European Community commonly referred to as NACE, is a European industry standard classification system consisting of a 6 digit code. Here I leave a PHP array with the categories of the first level. The European comunity give us a plain text file available hier. A - Agriculture, forestry and fishing&nbsp

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-91298986452088911752014-07-11T10:55:00.003+02:002014-07-11T10:55:50.957+02:00

Again problems with MAMP. I have a project in PHP which should access via CRON to MySQL running on MAMP.  With the default MAMP's configuration that is not possible. What to do? OPTION A. Setting PATHs 1) Edit th .profile file (vi ~/.profile) and change the line export PATH=/opt/local/bin:/opt/local/sbin:$PATH to export PATH=/Applications/MAMP/Library/bin/:/Applications/MAMP/bin/

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-71121455642576186532014-05-14T10:40:00.000+02:002014-05-14T10:43:06.558+02:00

Here you will find instructions on how to install Apache, MySQL and PHP on CentOS. Installing Packages 1 Install the required packages with the following command:  # yum install httpd php mysql mysql-server php-mysql Downloading Packages: (1/7): httpd-2.2.15-30.el6.centos.x86_64.rpm                &

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-63523074953574897702014-04-11T07:33:00.000+02:002014-04-11T07:39:36.615+02:00

From 7th April we should update our OpennSSL version. Why? Security reasons. An OppenSSL vulnerability was disclosed which has been called one of the worst security holes in the last years. Let's do it! OSX with MacPorts To know your current version type: openssl version -a myMac:~ Myself$ openssl version -a OpenSSL 1.0.1f 6 Jan 2014 Opps, I have a bug in my system. It's time to update and

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0tag:blogger.com,1999:blog-4690534361273837218.post-66363414818370192712014-04-10T12:56:00.002+02:002014-04-10T12:56:54.026+02:00

Hello, today... more Java First of all, eth0 is your ethernet card. They are labelled "ethX" starting with an X of 0, so if you had two ethernet cards, the second would be "eth1". Now, the idea is to get the IP address of my machine (small Raspberry Pi) using Java.  Normally, we can try simply with InetAddress.getLocalHost(). But if we have more than one ethernet card or a loop perhaps

Sergiohttp://www.blogger.com/profile/03716610560161067013noreply@blogger.com0