feat: Added the ability to create Instagram channel (#11182)

This PR is part of https://github.com/chatwoot/chatwoot/pull/11054 to
make the review cycle easier.

spec/services/instagram/refresh_oauth_token_service_spec.rb

@@ -0,0 +1,127 @@
+require 'rails_helper'
+
+RSpec.describe Instagram::RefreshOauthTokenService do
+  let(:account) { create(:account) }
+  let(:refresh_response) do
+    {
+      'access_token' => 'new_refreshed_token',
+      'expires_in' => 5_184_000 # 60 days in seconds
+    }
+  end
+  let(:fixed_token) { 'c061d0c51973a8fcab2ecec86f6aa41718414a10070967a5e9a58f49bf8a798e' }
+  let(:instagram_channel) do
+    create(:channel_instagram,
+           account: account,
+           access_token: fixed_token,
+           expires_at: 20.days.from_now) # Set default expiry
+  end
+  let(:service) { described_class.new(channel: instagram_channel) }
+
+  before do
+    stub_request(:get, 'https://graph.instagram.com/refresh_access_token')
+      .with(
+        query: {
+          'access_token' => fixed_token,
+          'grant_type' => 'ig_refresh_token'
+        },
+        headers: {
+          'Accept' => 'application/json',
+          'Accept-Encoding' => 'gzip;q=1.0,deflate;q=0.6,identity;q=0.3',
+          'User-Agent' => 'Ruby'
+        }
+      )
+      .to_return(status: 200, body: refresh_response.to_json, headers: { 'Content-Type' => 'application/json' })
+  end
+
+  describe '#access_token' do
+    context 'when token is valid and not eligible for refresh' do
+      before do
+        instagram_channel.update!(
+          updated_at: 12.hours.ago # Less than 24 hours old
+        )
+      end
+
+      it 'returns existing token without refresh' do
+        expect(service).not_to receive(:refresh_long_lived_token)
+        expect(service.access_token).to eq(fixed_token)
+      end
+    end
+
+    context 'when token is eligible for refresh' do
+      before do
+        instagram_channel.update!(
+          expires_at: 5.days.from_now, # Within 10 days window
+          updated_at: 25.hours.ago     # More than 24 hours old
+        )
+      end
+
+      it 'refreshes the token and updates channel' do
+        expect(service.access_token).to eq('new_refreshed_token')
+        instagram_channel.reload
+        expect(instagram_channel.access_token).to eq('new_refreshed_token')
+        expect(instagram_channel.expires_at).to be_within(1.second).of(5_184_000.seconds.from_now)
+      end
+    end
+  end
+
+  describe 'private methods' do
+    describe '#token_valid?' do
+      # For the expires_at null test, we need to modify the validation or use a different approach
+      context 'when expires_at is blank' do
+        it 'returns false' do
+          allow(instagram_channel).to receive(:expires_at).and_return(nil)
+          expect(service.send(:token_valid?)).to be false
+        end
+      end
+
+      context 'when token is expired' do
+        it 'returns false' do
+          allow(instagram_channel).to receive(:expires_at).and_return(1.hour.ago)
+          expect(service.send(:token_valid?)).to be false
+        end
+      end
+
+      context 'when token is valid' do
+        it 'returns true' do
+          allow(instagram_channel).to receive(:expires_at).and_return(1.day.from_now)
+          expect(service.send(:token_valid?)).to be true
+        end
+      end
+    end
+
+    describe '#token_eligible_for_refresh?' do
+      context 'when token is too new' do
+        before do
+          allow(instagram_channel).to receive(:updated_at).and_return(12.hours.ago)
+          allow(instagram_channel).to receive(:expires_at).and_return(5.days.from_now)
+        end
+
+        it 'returns false' do
+          expect(service.send(:token_eligible_for_refresh?)).to be false
+        end
+      end
+
+      context 'when token is not approaching expiry' do
+        before do
+          allow(instagram_channel).to receive(:updated_at).and_return(25.hours.ago)
+          allow(instagram_channel).to receive(:expires_at).and_return(20.days.from_now)
+        end
+
+        it 'returns false' do
+          expect(service.send(:token_eligible_for_refresh?)).to be false
+        end
+      end
+
+      context 'when token is expired' do
+        before do
+          allow(instagram_channel).to receive(:updated_at).and_return(25.hours.ago)
+          allow(instagram_channel).to receive(:expires_at).and_return(1.hour.ago)
+        end
+
+        it 'returns false' do
+          expect(service.send(:token_eligible_for_refresh?)).to be false
+        end
+      end
+    end
+  end
+end