ryana · May 25, 2016 15:04 · Dec 2, 2015 · Dec 2, 2015 · Dec 2, 2015
diff --git a/push_to_knowtify.rb b/push_to_knowtify.rb
@@ -1,23 +0,0 @@
-def push_data_to_knowtify
-  api_token = "SEKRIT"
-  headers = {'Authorization' => "Token token=#{api_token}", 'Content-Type' => "application/json"}
-  url_base = "http://www.knowtify.io/api/v1"
-  endpoint = "/contacts/upsert"
-
-  data = {
-    contacts: [
-      {
-        name: "John",
-        email: "[email protected]",
-        data: {
-          category:"sports",
-          followers:300,
-          recent_activity_chart_url: charturl_url,
-          last_updated_at: Time.now.to_i
-        }
-      }
-    ]
-  }
-
-  Typhoeus::Request.post("#{url_base}#{endpoint}", body: data.to_json, headers: headers)
-end

diff --git a/push_to_knowtify.rb b/push_to_knowtify.rb
@@ -0,0 +1,23 @@
+def push_data_to_knowtify
+  api_token = "SEKRIT"
+  headers = {'Authorization' => "Token token=#{api_token}", 'Content-Type' => "application/json"}
+  url_base = "http://www.knowtify.io/api/v1"
+  endpoint = "/contacts/upsert"
+
+  data = {
+    contacts: [
+      {
+        name: "John",
+        email: "[email protected]",
+        data: {
+          category:"sports",
+          followers:300,
+          recent_activity_chart_url: charturl_url,
+          last_updated_at: Time.now.to_i
+        }
+      }
+    ]
+  }
+
+  Typhoeus::Request.post("#{url_base}#{endpoint}", body: data.to_json, headers: headers)
+end
diff --git a/generate_url.rb b/generate_url.rb
@@ -0,0 +1,72 @@
+# Must install the `typhoeus` gem for this example.
+require 'typhoeus'
+
+# These dependencies work for Ruby 2.1.2. Earlier versions of
+# Ruby may need different requires or gems
+require 'json'
+require 'openssl'
+require 'base64'
+require 'cgi'
+
+# You get these from your ChartURL.com account
+# These are real credentials that we use for a public test account.
+CHARTURL_KEY = "dek-d7a46236eda961a6c3c18ffcc6b077ba87d27e9ae85f7842c6d427c265dd5f69d5131308d93332353d4a55a4b1160fcf516515a4a9f0aa50fbf2d7a2e7d0f1c5"
+CHARTURL_PROJECT_TOKEN = "dt-RwYN"
+
+class ChartURL
+
+  # This helper will try to generate an encrypted URL. The upside is that it
+  # does not require an HTTP request to ChartURL. The downside is that the URL
+  # could end being too long. In that case, it falls back to the
+  # `ChartURL.short_url_for` method
+  def self.url_for template, options
+    json = options.to_json
+    cipher = OpenSSL::Cipher.new 'AES-256-CBC'
+    cipher.encrypt
+    iv = cipher.random_iv
+    cipher.key =  OpenSSL::Digest::SHA256.new(CHARTURL_KEY).digest
+    encrypted_json = cipher.update(json) + cipher.final
+
+    iv_for_url = CGI.escape(Base64.encode64(iv))
+    data_for_url = CGI.escape(Base64.encode64(encrypted_json))
+
+    url = "https://charturl.com/i/#{CHARTURL_PROJECT_TOKEN}/#{template}/#{iv_for_url}/#{data_for_url}"
+
+    if url.size > 1500
+      short_url_for(template, options)
+    else
+      url
+    end
+  end
+
+  def self.short_url_for template, options
+    url = "https://charturl.com/short-urls.json?api_key=#{API_KEY}"
+    headers = {'Content-Type' => 'application/json'}
+    body = options.merge(template: template).to_json
+    surl_response = Typhoeus::Request.post(url, body: body, headers: headers)
+    raise("Error creating ShortURL: #{surl_response.inspect}") if !surl_response.success?
+    JSON.parse(surl_response.body)['short_url']
+  end
+end
+
+
+# Do whatever you need to create data
+def data_for_chart
+  {
+    options: {
+      data: {
+        columns: [
+          ['Last week'] + 7.times.map { rand(40) + 10 },
+          ['This week'] + 7.times.map { rand(20) + 20 }
+        ]
+      }
+    }
+  }
+end
+
+# Generate the URL. The first parameter, `weekly-activity`, is the slug
+# for a template you create over at ChartURL.com. This template contains
+# your style and chart options like axes labels, typography, etc....
+def charturl_url
+  ChartURL.url_for('weekly-activity', data_for_chart)
+end
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