nileshtrivedi

HyperTrackCore.requestLocationPermissions(this, new LocationPermissionCallback() {
            @Override
            public void onLocationPermissionGranted() {
                // Handle location permission granted 
            }
​
            @Override
            public void onLocationPermissionDenied() {
                // Handle location permission denied
            }

nileshtrivedi

# This script can be used standalone
# So it doesn't depend on filesystem or Google Cloud for the credentials

from google.cloud import firestore
from google.oauth2 import service_account

key = 'your_credentials_json_string'

info = json.loads(key)
creds = service_account.Credentials.from_service_account_info(info)

nileshtrivedi

CREATE EXTENSION IF NOT EXISTS plpythonu;

-- plpython is untrusted. Access needs to be controlled carefully

CREATE OR REPLACE FUNCTION py_test () RETURNS varchar AS $$
  return 'hi'
$$ LANGUAGE plpythonu;

CREATE OR REPLACE FUNCTION py_create_ed25519_keypair ()
  RETURNS varchar[]

nileshtrivedi

Keybase proof

I hereby claim:

• I am nileshtrivedi on github.
• I am nileshtrivedi (https://keybase.io/nileshtrivedi) on keybase.
• I have a public key ASDS2qJDEl9_uy-LwMNZItAdCCU9ct2v6V57tlhS80cErgo

To claim this, I am signing this object:

nileshtrivedi

Programming: Mostly A Hate Story

I wanted to do digital signatures validation, preferably ed25519, inside PostgreSQL triggers. Here is how it went:

Surely pgcrypto must be supporting it, right? Most Postgres cloud hosting providers already support pgcrypto so this would be perfect. Right?

Well, pgcrypto only supports PGP and that too excludes digital signatures. Let's give PGP a try anyway and see how far can we go.

Installed gpg to generate the keys and the experience is less than pleasant. Sometimes it gets stuck at the passphrase prompt. The keys are too big, but still I can make pgcrypto's pgp_pub_encrypt and pgp_pub_decrypt methods work. Just remeber to convert keys in ASCII to binary and vice-versa using armor()/dearmor(). I hate the big key size in RSA, even though GPG defaults to 2048-bit keys and not the more secure 4096-bit ones. Let's look into ed25519 now.

nileshtrivedi

a = {a: [:b, :c], b: [:c]}

def get_edges(sm)
	res = []
	sm.each do |s, e|
		e.each do |d|
			res.push([s,d])
		end
	end
	res

nileshtrivedi

CREATE EXTENSION IF NOT EXISTS plpythonu;

CREATE FUNCTION py_create_ed25519_keypair ()
  RETURNS varchar[]
AS $$
  import axolotl_curve25519 as curve
  import os
  import base64

  randm32 = os.urandom(32)

nileshtrivedi

Verifying my Blockstack ID is secured with the address 15e4krfMSXCgWrRpo2FnVRy7DLQ7HuMBQm https://explorer.blockstack.org/address/15e4krfMSXCgWrRpo2FnVRy7DLQ7HuMBQm

nileshtrivedi

require 'sshkit'
require 'sshkit/dsl'

# Once "bundle install" has been run, this script can be run as "ruby deploy.rb staging" or "ruby deploy.rb prod"

if ARGV.first == "prod"
  servers = ['[email protected]', '[email protected]']
elsif ARGV.first == "staging"
  servers = ['[email protected]']
else

nileshtrivedi

#!/usr/bin/python

# You need stereovision package to run this. Try "sudo pip install stereovision"

import cv2
from stereovision.blockmatchers import StereoBM, StereoSGBM
from stereovision.calibration import StereoCalibration
from stereovision.stereo_cameras import CalibratedPair
from stereovision.ui_utils import STEREO_BM_FLAG, BMTuner