From cbbe89db4c4e98f8e20810045ba58ceda1a9a05a Mon Sep 17 00:00:00 2001
From: Agnes Chang <kradeki@gmail.com>
Date: Tue, 11 Dec 2018 16:50:43 -0500
Subject: [PATCH] Add example OAuth handshake for Google Drive API V3

---
 examples/google_drive_v3.rb | 118 ++++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 examples/google_drive_v3.rb

diff --git a/examples/google_drive_v3.rb b/examples/google_drive_v3.rb
new file mode 100644
index 0000000..ade5c9a
--- /dev/null
+++ b/examples/google_drive_v3.rb
@@ -0,0 +1,118 @@
+#!/usr/bin/env ruby
+
+# Updated 12/2018 by @agness to work with Google Drive API V3, since Google no
+# longer maintains documentation for OAuth on legacy API versions.
+# Google V3 Auth guide: https://developers.google.com/drive/api/v3/about-auth
+# This example expects your client secret in `~/.googlecloud/credentials.json`,
+# created via https://console.developers.google.com/apis/credentials; and your
+# personal access token in `~/.googlecloud/token.yaml`, which is generated and
+# automatically stored on disk once you've run this code once.
+#
+# Adapted from example code Copyright 2018 by Google Inc.,
+# Licensed under the Apache License, Version 2.0.
+# https://github.com/gsuitedevs/ruby-samples/blob/master/drive/quickstart/quickstart.rb
+
+FILE_ID = "1JjYD90DyoaBuRYNxa4_nqrHKkgZf1HrUj30i3rTWX1s"
+
+require 'archieml'
+require 'google/apis/drive_v3'
+require 'googleauth'
+require 'googleauth/stores/file_token_store'
+require 'nokogiri'
+require 'pp'
+
+OOB_URI = 'urn:ietf:wg:oauth:2.0:oob'.freeze
+APPLICATION_NAME = 'Drive API Ruby Quickstart'.freeze
+CREDENTIALS_PATH = (ENV['HOME']+'/.googlecloud/credentials.json').freeze
+TOKEN_PATH = (ENV['HOME']+'/.googlecloud/token.yaml').freeze
+SCOPE = Google::Apis::DriveV3::AUTH_DRIVE_READONLY
+
+##
+# Ensure valid credentials, either by restoring from the saved credentials
+# files or intitiating an OAuth2 authorization. If authorization is required,
+# the user's default browser will be launched to approve the request.
+#
+# @return [Google::Auth::UserRefreshCredentials] OAuth2 credentials
+def authorize
+  client_id = Google::Auth::ClientId.from_file(CREDENTIALS_PATH)
+  token_store = Google::Auth::Stores::FileTokenStore.new(file: TOKEN_PATH)
+  authorizer = Google::Auth::UserAuthorizer.new(client_id, SCOPE, token_store)
+  user_id = 'default'
+  credentials = authorizer.get_credentials(user_id)
+  if credentials.nil?
+    url = authorizer.get_authorization_url(base_url: OOB_URI)
+    puts 'Open the following URL in the browser and enter the ' \
+         "resulting code after authorization:\n" + url
+    code = gets
+    credentials = authorizer.get_and_store_credentials_from_code(
+      user_id: user_id, code: code, base_url: OOB_URI
+    )
+  end
+  credentials
+end
+
+# Authenticate
+service = Google::Apis::DriveV3::DriveService.new
+service.client_options.application_name = APPLICATION_NAME
+service.authorization = authorize
+
+# Text version
+text_aml = service.export_file(FILE_ID, 'text/plain').force_encoding('utf-8')
+parsed = Archieml.load(text_aml)
+puts parsed
+
+puts "======"
+
+# HTML version
+html_data = service.export_file(FILE_ID, 'text/html').force_encoding('utf-8')
+
+def convert(node)
+  str = ''
+  node.children.each do |child|
+    if func = @node_types[child.name || child.type]
+      str += func.call(child)
+    end
+  end
+  return str
+end
+
+@node_types = {
+  'text' => lambda { |node| return node.content },
+  'span' => lambda { |node| convert(node) },
+  'p'    => lambda { |node| return convert(node) + "\n" },
+  'li'   => lambda { |node| return '* ' + convert(node) + "\n" },
+  'a'    => lambda { |node|
+    return convert(node) unless node.attributes['href'] && node.attributes['href'].value
+
+    # Google changes all links to be served from a google domain.
+    # We need to strip off the real url, which has been moved to the
+    # "q" querystring parameter.
+
+    href = node.attributes['href'].value
+    if !href.index('?').nil? && parsed_url = CGI.parse(href.split('?')[1])
+      href = parsed_url['q'][0] if parsed_url['q']
+    end
+
+    str = "<a href=\"#{href}\">"
+    str += convert(node)
+    str += "</a>"
+    return str
+  }
+}
+
+%w(ul ol).each { |tag| @node_types[tag] = @node_types['span'] }
+%w(h1 h2 h3 h4 h5 h6 br hr).each { |tag| @node_types[tag] = @node_types['p'] }
+
+html_doc = Nokogiri::HTML(html_data)
+html_aml = convert(html_doc.children[1].children[1])
+
+html_aml.gsub!(/<[^<>]*>/) do |match|
+  match.gsub("‘", "'")
+       .gsub("’", "'")
+       .gsub("“", '"')
+       .gsub("”", '"')
+end
+
+aml = Archieml.load(html_aml)
+
+pp aml