DEV Community: Harry Patel

Simple CORS checker

Harry Patel — Wed, 26 Aug 2020 08:18:35 +0000

Simple way to check if your API has CORS configured for any origin (i.e *). Note CORS only applies for browsers or apps, not curl.

browse to https://www.google.com/
open dev tools and the console tab where you can run javascript
copy and paste this: fetch("https://yahoo.com").then(res => res.json()).then(console.log)
hit enter to execute it and you should errors (as yahoo is not open to CORS from google)
change the url to your API end point and try again. If CORS is setup to allow any origin there will not be any errors

Iterm2 nuggets

Harry Patel — Wed, 12 Aug 2020 09:24:07 +0000

If you're using Iterm2 as you terminal and have Zsh installed, here are some nuggets i've recently discovered:

Instead of the cd (change directory) command, navigate directories with just:
.. (parent dir)
... (parent from parent dir)
/ (root)
~ (home)
Instead of the mkdir and cd commands, use take command to create a directory and change the path to it
Switch between the last and current path with a hyphen -
List all alias commands with alias or filter them with grep alias | grep git

AWS CodeCommit - setting up SSH

Harry Patel — Sun, 09 Aug 2020 09:52:22 +0000

AWS CodeCommit is basically Github on AWS but it's private, and for sole devs is essentially free.

To set up your identity, just as with Github, you can use HTTPS or SSH. In order to use SSH, I'd recommend setting up a new key pair and so this is what I did on my mac.

Open a terminal on your machine and navigate to the ssh folder e.g.

cd ~/.ssh

Create a new RSA key pair into a dedicated file. Note this format was known to work with Github, CircleCI, Digital Ocean and AWS.

ssh-keygen -f ./codecommit -m PEM -t rsa -C 'your-email-for@commit-messages'

Copy it to your clipboard

pbcopy < ./codecommit.pub

Login to your AWS account and visit the code commit security credentials page.
Click "Upload SSH public key" and paste
It will save it and display a "SSH Key ID". Copy this - this is Your-IAM-SSH-Key-ID
Back to your terminal, see if you have a ~/.ssh/config file

ls -la

If you do, edit it, if not create and edit it and enter the following:

Host git-codecommit.*.amazonaws.com User Your-IAM-SSH-Key-ID IdentityFile ~/.ssh/codecommit

You should now be able to use your ssh credentials to work with CodeCommit

MongoDB have built a CI System

Harry Patel — Sat, 01 Aug 2020 09:02:11 +0000

MongoDB have built a continuous integration system which they appear to use in-house to test mongo against hundreds of operating systems.

https://github.com/evergreen-ci/evergreen/wiki

AWS Certified Cloud Practitioner Practice (CLF-P01)

Harry Patel — Wed, 22 Jul 2020 11:04:41 +0000

I've just passed my AWS Certified Cloud Practitioner Practice (CLF-P01) exam and thought I'd share some findings.

Free resources

Paid resources

There was an offer such that Stephane Maarek's Udemy Course was free and that's good too but you'll probably need to pay for it but try the free resources first and see how you feel.

There are practice exams for $20 (excl tax) from AWS but that's pretty much the cost of Stephane's course.

The exam

Due to Covid-19 and the convenience of it, i did my exam using Pearson Vue's online system which you register for by using this.
It was $100 (excl tax) and you can choose from lots of time slots.
You get 100 minutes for the exam.
You have to install something on your machine which is where you do the exam and your machine must have a webcam and microphone
You can start the check-in process 30 minutes before the exam start and this is where you provide pictures of your room and government id (e.g. passport). After you have checked in, if there is more than 5 minutes before the exam, do not hit the next button (you'll know what i mean) as you will have effectively started the exam conditions.
Eventually, a few minutes before your exam start time, an invigilator/proctor will use online chat, having access to your webcam to check a few things around your desk. You will need to clear all sorts of things such as stationary, drinks, food so they are all out of reach.
Yes you cannot eat or drink during the exam and cannot leave your chair.
They watch you during the entire exam. I was picked up (by a second invigilator) that I was looking away from the screen - but I was trying to think about an answer. I understand where they are coming from though.

Good Luck.