Class: OSub::Subscription

Inherits:
Object
  • Object
show all
Defined in:
lib/osub/subscription.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(callback_url, topic_url, secret = nil) ⇒ Subscription

Returns a new instance of Subscription.



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# File 'lib/osub/subscription.rb', line 12

def initialize(callback_url, topic_url, secret = nil)
  @tokens = []

  secret = "" if secret == nil
  @secret = secret.to_s

  @callback_url = callback_url
  @topic_url = topic_url
end

Instance Attribute Details

#callback_url ⇒ Object (readonly)

Returns the value of attribute callback_url.



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# File 'lib/osub/subscription.rb', line 9

def callback_url
  @callback_url
end

#topic_url ⇒ Object (readonly)

Returns the value of attribute topic_url.



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# File 'lib/osub/subscription.rb', line 10

def topic_url
  @topic_url
end

Instance Method Details

#change_subscription(mode, hub_url, token, redirect_limit = 10) ⇒ Object 



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# File 'lib/osub/subscription.rb', line 43

def change_subscription(mode, hub_url, token, redirect_limit = 10)
  hub_uri = URI.parse(hub_url)

  req = Net::HTTP::Post.new(hub_uri.request_uri)
  req.set_form_data({
    'hub.mode' => mode.to_s,
    'hub.callback' => @callback_url,
    'hub.verify' => 'async',
    'hub.verify_token' => token,
    'hub.lease_seconds' => '',
    'hub.secret' => @secret,
    'hub.topic' => @topic_url
  })

  http = Net::HTTP.new(hub_uri.hostname, hub_uri.port)
  if hub_uri.scheme == 'https'
    http.use_ssl = true
    http.verify_mode = OpenSSL::SSL::VERIFY_PEER
  end

  response = http.request(req)

  if response.is_a?(Net::HTTPRedirection) && redirect_limit > 0
    location = response['location']
    self.change_subscription(mode, hub_url, token, redirect_limit - 1)
  else
    response
  end

rescue OpenSSL::SSL::SSLError
  return nil
end

#hubs ⇒ Object

Actively searches for hubs by talking to publisher directly



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# File 'lib/osub/subscription.rb', line 23

def hubs
  OStatus::Feed.from_url(topic_url).hubs
end

#perform_challenge(challenge_code) ⇒ Object 



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# File 'lib/osub/subscription.rb', line 89

def perform_challenge(challenge_code)
  {:body => challenge_code, :status => 200}
end

#subscribe(hub_url, token = nil) ⇒ Object

Subscribe to the topic through the given hub.



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# File 'lib/osub/subscription.rb', line 28

def subscribe(hub_url, token = nil)
  if token != nil
    @tokens << token.to_s
  end
  change_subscription(:subscribe, hub_url, token)
end

#unsubscribe(hub_url, token = nil) ⇒ Object

Unsubscribe to the topic through the given hub.



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# File 'lib/osub/subscription.rb', line 36

def unsubscribe(hub_url, token = nil)
  if token != nil
    @tokens << token.to_s
  end
  change_subscription(:unsubscribe, hub_url, token)
end

#verify_content(body, signature) ⇒ Object 



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# File 'lib/osub/subscription.rb', line 83

def verify_content(body, signature)
  hmac = HMAC::SHA1.hexdigest(@secret, body)
  check = "sha1=" + hmac
  check == signature
end

#verify_subscription(token) ⇒ Object 



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# File 'lib/osub/subscription.rb', line 76

def verify_subscription(token)
  result = @tokens.index(token) != nil
  @tokens.delete(token)

  result
end