Failed to find a valid digest in the ‘integrity’ attribute for resource

Explanation of the problem

The integration of Offen into my websites encountered several obstacles. Here is an overview of the setup: The latest version of Offen was obtained from Docker Hub, and the websites utilize an nginx server as a reverse proxy. The Offen Docker image is deployed under the domain “offen.mttaudio.com”, while the web application process is hosted under “www-pre.mttaudio.com”. However, the integration process resulted in the following errors.

When accessing “www-pre.mttaudio.com”, the error message “Refused to display ‘https://offen.mttaudio.com/vault/‘ in a frame because it set ‘X-Frame-Options’ to ‘sameorigin'” was encountered. This error is associated with the X-Frame-Options header, which prevents the site from being loaded within an iframe due to the same-origin policy. Although removing the X-Frame-Options header resolves the issue, a solution is sought to preserve this header.

However, removing the X-Frame-Options header allowed Offen to load successfully. Nonetheless, two additional errors were observed, which also occurred when visiting the Offen Auditorium. The first error states “Failed to find a valid digest in the ‘integrity’ attribute for resource ‘https://offen.mttaudio.com/vault/vendor-cdc94dde8f.js‘ with computed SHA-256 integrity ‘7h+DJVtMpNr1FVMcCV2spIwSjnKvTKLBR8VCunEO6IE=’. The resource has been blocked.” The second error is similar and indicates a failure to find a valid digest for the resource ‘https://offen.mttaudio.com/vault/index-405319a057.js‘ with the computed SHA-256 integrity ‘EUQKQfu5yNZ7NP1VpXeomJrtWqIK1E3GMHeGFRUcC+s=’. These errors relate to the integrity attribute of the script resources, which are being blocked due to mismatched or missing digests.

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Problem solution for: Failed to find a valid digest in the ‘integrity’ attribute for resource

To address the X-Frame-Options issue, one possible solution is to configure nginx to allow framing from specific domains while keeping the X-Frame-Options header intact. This can be achieved by adding the add_header directive to the nginx configuration file for the specific location or server block where Offen is being served. Here’s an example:

location /vault/ {
    add_header X-Frame-Options "ALLOW-FROM https://www-pre.mttaudio.com";
    # Other directives...
}

In this example, the X-Frame-Options header is set to allow framing only from the domain “https://www-pre.mttaudio.com“. Adjust the domain according to your specific requirements.

Regarding the integrity attribute errors, it appears that the computed digests for the script resources in the Offen vault are not matching the expected values. To resolve this, you may need to ensure that the integrity attribute values for the script resources in the HTML file match the actual computed digests. Here’s an example of how the integrity attribute can be added to a script tag:

<script src="https://offen.mttaudio.com/vault/vendor-cdc94dde8f.js" integrity="sha256-7h+DJVtMpNr1FVMcCV2spIwSjnKvTKLBR8VCunEO6IE=" crossorigin="anonymous"></script>

Ensure that the integrity attribute values for both “vendor-cdc94dde8f.js” and “index-405319a057.js” match the computed SHA-256 digests. This ensures that the resources are loaded only if their integrity matches the provided value.

By implementing these solutions, you should be able to resolve the X-Frame-Options issue and ensure that the script resources in the Offen vault are loaded without integrity attribute errors.

package main

import (
	"net/http"

	"github.com/rs/cors"
)

func main() {
	// Create a new mux router
	mux := http.NewServeMux()

	// ... Define your Offen routes

	// Create a new CORS handler
	c := cors.Default().Handler(mux)

	// Start the server with the CORS handler
	http.ListenAndServe(":8080", c)
}

In the above example, the cors.Default() function from the github.com/rs/cors package is used to create a CORS middleware with default options. This middleware is then applied to the main router of your server. Adjust the server configuration and CORS options according to your specific needs.

Problem 2: Integration with Single-Page Applications (SPAs) Description: Another challenge with Offen is integrating it with Single-Page Applications (SPAs) built with frameworks like React or Angular. Since SPAs handle routing on the client-side, traditional page refreshes may not occur, causing Offen’s tracking to be incomplete or inaccurate.

Solution: To ensure proper tracking in SPAs, you can use Offen’s JavaScript API to manually trigger page views or events when navigating within the SPA. Here’s an example of how to use the offen object from Offen’s JavaScript API:

import offen from 'offen';

// Initialize Offen
const tracker = offen({
  url: 'https://your-offen-instance.com',
  siteID: 'your-site-id',
});

// Track a page view
tracker.pageView();

// Track a custom event
tracker.trackEvent('button-click', { label: 'Button A' });

By using the offen object and its methods, you can manually track relevant interactions and events within your SPA, ensuring accurate data collection by Offen.

Problem 3: Privacy Compliance and Consent Management Description: Offen is designed to prioritize user privacy and consent management. However, ensuring compliance with privacy regulations such as the General Data Protection Regulation (GDPR) can be a challenge. It requires obtaining explicit consent from users before tracking their data.

Solution: To address privacy compliance and consent management with Offen, you can implement a consent banner or dialog in your application. This allows users to provide explicit consent before Offen starts tracking their data. Here’s an example of how to implement a consent banner:

// Show a consent banner
function showConsentBanner() {
  // Display the banner in your UI
}

// Handle user consent
function handleConsent() {
  // Set the consent status
  offen.setConsent(true);

  // Hide the consent banner
}

// Check if user has provided consent
if (offen.getConsent() !== true) {
  showConsentBanner();
}

In the above example, the showConsentBanner() function displays a consent banner in your application’s UI. When the user provides consent, the handleConsent() function is called, setting the consent status in Offen using `offen.setConsent(true

import Offen from 'offen';

const offen = new Offen('https://offen.example.com');
offen.start();

docker run -d -p 8080:8080 offen/offen:v0.5.0

const response = await fetch('https://offen.example.com/api/v1/analytics/pageviews');
const data = await response.json();
console.log(data);