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require 'aws-sdk-dynamodb'

# DynamoDB batch write (put) routine
# @param items [Array<Hash>] DynamoDB items to put
# @param table [String] DynamoDB table name
def ddb_batch_put(items, table)
  ddb = Aws::DynamoDB::Client.new
  batch = items.map { |item| {put_request: {item: item}} if Hash === item }
  batch.compact!
  puts "Batch write to: #{table}, #{batch.length} items."

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# Check IP address
ip a

# Check default gateway
ip r
route -n

# Check DNS server
systemd-resolve --status

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require 'base64'
require 'openssl'

# See: https://www.twilio.com/docs/usage/security#validating-requests
#
# Example of AWS API Gateway (HTTP) + Lambda
def is_twilio_request_valid?(event)
  # Create a string that is your URL with the full query string
  url = "https://#{event['headers']['host']}#{event['rawPath']}"
  # Sort the list of POST variables by the parameter name

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{
  "version":2,
  "path":"/event",
  "httpMethod":"GET",
  "headers":{
    "Content-Length":"0",
    "Host":"abcde12345.execute-api.us-west-2.amazonaws.com",
    "User-Agent":"curl/7.54.0",
    "X-Amzn-Trace-Id":"Root=1-67891233-abcdef012345678912345678",
    "X-Forwarded-For":"192.168.1.23",

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#
# Build and Package RubyGems for AWS Lambda Layer Use
#
all: build package

build:
	gem i firebase-ruby -Ni ruby/gems/2.5.0
	gem i darksky-ruby -Ni ruby/gems/2.5.0
	ls -m ruby/gems/2.5.0/gems

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Slack OAuth for Bot App

1. Autorization

Open in a web browser: https://slack.com/oauth/authorize?scope=bot&client_id=12345.67890

• Use Client ID from App Credentials.
• Use bot for scope.

2. Authorization Code

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Edit Windows Registry

1. Open Registry Editor
2. Go to: Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Keyboard Layout
3. Edit, or add, binary value key: Scancode Map (see below)
4. Restart to take effect

Map Value

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http {
  # Shared cache size; 1MB = 4000 sessions
  ssl_session_cache shared:SSL:10m;
  # Decrease timeout if resources are low
  ssl_session_timeout 10m;
  # Good-bye SSL
  ssl_protocols TLSv1.1 TLSv1.2;
  ssl_prefer_server_ciphers on;
  ssl_ciphers ECDH+AESGCM:ECDH+AES256:ECDH+AES128:!ADH:!AECDH:!MD5;
  # OCSP stapling

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opts = {
  indent: '  ',
  space: ' ',
  object_nl: "\n",
  array_nl: "\n"
}
JSON.fast_generate(obj, opts)

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def load_from_path(path)
  Dir.chdir(path) {
    Dir.foreach('.') { |f| load f unless File.directory?(f) }
  }
end

paths = [
  'conf.d',
  'plugins'
]