Use applicableSections and supportedAPIs to get consentState (#1818)

* Use applicableSections and supportedAPIs to get consentState

* Add changeset

* Update @types/node to @types/node

* Update comments

* Change const from applicableSections to applicableSection

Co-authored-by: Ravi <[email protected]>

* Change const from applicableSections to applicableSection

* Extend test to cover failed api

* Update function to find supportedAPI

* Add more tests for getConsentState

---------

Co-authored-by: Ravi <[email protected]>

.changeset/twenty-parrots-help.md

@@ -0,0 +1,5 @@
+---
+'@guardian/libs': patch
+---
+
+Use applicableSections and supportedAPI to get consent state in the US

libs/@guardian/libs/src/consent-management-platform/usnat/getConsentState.test.js

@@ -48,4 +48,48 @@ describe('getConsentState', () => {
 		expect(getGPPData).toHaveBeenCalledTimes(1);
 		expect(doNotSell).toBe(false);
 	});
+
+	it('should return false if the applicableSections is not correctly set - doNotSell is false', async () => {
+		let applicableSectionsIncorrect = gppDataCanSell;
+		applicableSectionsIncorrect.applicableSections = [-1];
+		getGPPData.mockResolvedValue(applicableSectionsIncorrect);
+
+		const { doNotSell } = await getConsentState();
+
+		expect(getGPPData).toHaveBeenCalledTimes(1);
+		expect(doNotSell).toBe(false);
+	});
+
+	it('should return false if the supportedAPIs has an incorrect format  - doNotSell is false', async () => {
+		let applicableSectionsIncorrect = gppDataCanSell;
+		applicableSectionsIncorrect.applicableSections = [-1];
+		getGPPData.mockResolvedValue(applicableSectionsIncorrect);
+
+		const { doNotSell } = await getConsentState();
+
+		expect(getGPPData).toHaveBeenCalledTimes(1);
+		expect(doNotSell).toBe(false);
+	});
+
+	it('should return false if supportedAPIs and parsedSections are different - doNotSell is false', async () => {
+		let supportedApiParsedSectionMismatch = gppDataCanSell;
+		supportedApiParsedSectionMismatch.supportedAPIs = ['7:usnat'];
+		getGPPData.mockResolvedValue(supportedApiParsedSectionMismatch);
+
+		const { doNotSell } = await getConsentState();
+
+		expect(getGPPData).toHaveBeenCalledTimes(1);
+		expect(doNotSell).toBe(false);
+	});
+
+	it('should return false if the parsedSections is not correctly set - doNotSell is false', async () => {
+		let parsedSectionsIncorrect = gppDataCanSell;
+		parsedSectionsIncorrect.parsedSections = {};
+		getGPPData.mockResolvedValue(parsedSectionsIncorrect);
+
+		const { doNotSell } = await getConsentState();
+
+		expect(getGPPData).toHaveBeenCalledTimes(1);
+		expect(doNotSell).toBe(false);
+	});
 });

libs/@guardian/libs/src/consent-management-platform/usnat/getConsentState.ts

@@ -4,12 +4,28 @@ import { getGPPData } from './api';
 export const getConsentState: () => Promise<USNATConsentState> = async () => {
 	let doNotSell = false; // Opt-Out
 	const gppData = await getGPPData();
-	const supportedAPI = Object.values(gppData.parsedSections)[0];
 
-	if (supportedAPI) {
+	// Get applicableSections
+	const applicableSection = gppData.applicableSections[0]; // e.g. '7' for usnat
+
+	// Find the supported API
+	const supportedAPI = gppData.supportedAPIs.find((api) =>
+		api.startsWith(`${String(applicableSection)}:`),
+	); // Find string that contains the applicableSection i.e. (7) in '7:usnat'
+
+	// Get parsedSections key and object
+	const parsedSectionKey = supportedAPI
+		? supportedAPI.split(':')[1]
+		: undefined; // i.e. get 'usnat' from '7:usnat'
+
+	const parsedSection = parsedSectionKey
+		? gppData.parsedSections[parsedSectionKey]
+		: undefined; // Get the gpp consent object with the key
+
+	if (parsedSection) {
 		// https://github.com/InteractiveAdvertisingBureau/Global-Privacy-Platform/blob/main/Sections/US-National/IAB%20Privacy%E2%80%99s%20National%20Privacy%20Technical%20Specification.md
 		// 0 Not Applicable. SharingOptOutNotice value was not applicable or no notice was provided, 1 Opted Out, 2 Did Not Opt Out
-		doNotSell = supportedAPI.SaleOptOut !== 2 || supportedAPI.Gpc;
+		doNotSell = parsedSection.SaleOptOut !== 2 || parsedSection.Gpc;
 	}
 
 	return {