Simulate mobile accessing Rails API

You might be using Rails API to create a back end while the view layer is handled by mobile application. So how do you simulate sending headers to the API (i.e: authentication). You can use terminal and do a curl command:

curl \
-H "Content-Type: application/json" \
-H "Accept: application/json" \
-H "User-Token: 18773930-285a-434a-b044-533252e49435" \
-X POST \
-d '{"following": {"username": "sentul"}}' \
http://localhost:3000/followings

Bundle Install not responding

There are times where bundle install command does not giving any output for a long period of time (giving broken pipe via ssh). You can try using this command and see the output:

bundle --verbose

RSA Encryption and Decryption

1. Generate private key (choose your own pass phrase)

openssl genrsa -des3 -out private.pem 2048

Generating RSA private key, 2048 bit long modulus ......................................................................+++ ..............+++
e is 65537 (0x10001)
Enter pass phrase for private.pem:
Verifying - Enter pass phrase for private.pem:

2. Extract public key

openssl rsa -in private.pem -out public.pem -outform PEM -pubout

Enter pass phrase for private.pem:
writing RSA key

3. To encrypt data

require 'openssl'
require 'base64'
plaintext = 'Sentul was here.';
publickey = OpenSSL::PKey::RSA.new(File.read('public.pem'))
cyphertext = Base64.encode64(publickey.public_encrypt(plaintext))
print cyphertext, "\n"

ZXRd/2jJpYEJkQroWcs1QVJIII+yeQWtBPeSilSWqel5l8WcdGg2vwFh4rcf dKXjk54WPn/2jfBkk6TBssHcYr6wbHlzJG9MjqZHAqhWgaVRA9R9fDYkFS6F o0Nqtpp46B4luilKhC6npWS4zlR9vyIJwyp3mLDnbPaB5sUIGluOoRtE1Z7k 3jYAF6Xz9fYCJqVPGHoO7xDALNMEmJqxCHjFttxjAZoiEL84AdT3ZI3FJUmv nxgyuGu9daYpfK+8kVXlW/qqVPKdQmWSOEVlTXzSq9j4pgWvuTk6Jg21b7Hf NHJ515iSBdt5NGPgNCPeB4mNhq3hOkmMwX7HRppf1Q==

4. To decrypt data. The pass phrase is 'sentul asia' as an example. Your cyphertext will definitely differ from the one below.

require 'openssl'
require 'base64'
passphrase = 'sentul asia'
cyphertext = %Q{ ZXRd/2jJpYEJkQroWcs1QVJIII+yeQWtBPeSilSWqel5l8WcdGg2vwFh4rcf dKXjk54WPn/2jfBkk6TBssHcYr6wbHlzJG9MjqZHAqhWgaVRA9R9fDYkFS6F o0Nqtpp46B4luilKhC6npWS4zlR9vyIJwyp3mLDnbPaB5sUIGluOoRtE1Z7k 3jYAF6Xz9fYCJqVPGHoO7xDALNMEmJqxCHjFttxjAZoiEL84AdT3ZI3FJUmv nxgyuGu9daYpfK+8kVXlW/qqVPKdQmWSOEVlTXzSq9j4pgWvuTk6Jg21b7Hf NHJ515iSBdt5NGPgNCPeB4mNhq3hOkmMwX7HRppf1Q== }
privatekey = OpenSSL::PKey::RSA.new(File.read('private.pem'),passphrase)
plaintext = privatekey.private_decrypt(Base64.decode64(cyphertext))
print plaintext"

Sentul was here.