Log into Slack

.env.sample

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+SLACK_DOMAIN=
+SLACK_USERNAME=
+SLACK_PASSWORD=

lib/slack_mattermost_emoji/slack_client.rb

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+require 'selenium-webdriver'
+
+module SlackMattermostEmoji
+  class SlackClient
+    def initialize(username:, password:, domain:)
+      @username = username
+      @password = password
+      @domain = domain
+      @authenticated = false
+
+      options = Selenium::WebDriver::Chrome::Options.new
+      options.headless!
+      @driver = Selenium::WebDriver.for :chrome, options: options
+
+
+      if [@username, @password, @domain].any? { |el| el.nil? || el.empty? }
+        raise 'Slack username, password, and domain are all required'
+      end
+    end
+
+    def authenticate
+      @driver.navigate.to "https://#{@domain}"
+      @driver.find_element(name: 'email').send_keys(@username)
+      @driver.find_element(name: 'password').send_keys(@password)
+      @driver.find_element(id: 'signin_btn').click
+
+      begin
+        @driver.find_element(css: 'p.alert.alert_error')
+        raise 'Invalid credentials'
+      rescue Selenium::WebDriver::Error::NoSuchElementError
+        nil
+      end
+
+      @authenticated = true
+    end
+
+    def authenticated?
+      @authenticated
+    end
+  end
+end

spec/slack_client_spec.rb

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+require "dotenv/load"
+require "slack_mattermost_emoji/slack_client"
+
+RSpec.describe SlackMattermostEmoji::SlackClient do
+  it 'should be able to log in to slack using the provided credentials' do
+    client = SlackMattermostEmoji::SlackClient.new(
+      username: ENV['SLACK_USERNAME'],
+      password: ENV['SLACK_PASSWORD'],
+      domain: ENV['SLACK_DOMAIN']
+    )
+    client.authenticate
+
+    expect(client.authenticated?).to be true
+  end
+
+  it 'should handle a bad credentials error' do
+    client = SlackMattermostEmoji::SlackClient.new(
+      username: ENV['SLACK_USERNAME'],
+      password: 'wrongpassword',
+      domain: ENV['SLACK_DOMAIN']
+    )
+    expect { client.authenticate }.to raise_error('Invalid credentials')
+  end
+end