OGProxy - a replacement for iFramely

[phenomlab]

UPDATE: OGProxy is now live on this forum

https://sudonix.org/topic/498/setup-ogproxy-for-use-in-nodebb

[phenomlab]

Already found 2 bugs, which have been committed to live code

• Relative path is provided in some instances, so a function now exists to return the full path instead so the image is rendered
• OGProxy does not target chat - this has been fixed

[phenomlab]

One thing I never really took into account when developing OGProxy was the potential for CLS (Cumulative Layout Shifting). If you’re sitting there thinking “what is he talking about?” then this goes some way to explain it

https://blog.hubspot.com/marketing/cumulative-layout-shift

Not only does this harm the user experience in the sense that the page jumps all over the place when you are trying to read content, but is also harmful when it comes to site performance and SEO, as this is a key measurable when checking page performance and speed.

Based on this, I’ve made several changes to how OGProxy works - some of which I will outline below

1. Link Selection and Filtering

The function selects certain links in the document and filters out unnecessary ones, like internal links or specific classes.
It further filters links by checking for domains or file types that should be ignored.

2. Placeholders for Preventing Content Layout Shift (CLS)

Placeholders are inserted initially with a generic “Loading…” message and a temporary image. This prevents CLS, which happens when the page layout shifts due to asynchronously loaded content. By having a placeholder occupy the same space as the final preview, the layout stays stable while data is fetched.

3. AJAX Request to Fetch Link Metadata

The function sends an AJAX request to an OpenGraph proxy service to retrieve metadata (title, description, and image) about each link. It uses the same proxy server and API key to fetch this information as it’s predecessor.

4. Dynamic Update of Placeholder with Real Data

Once data is retrieved, the placeholder is replaced with the actual preview. Title, description, and image are updated based on the fetched metadata. If an image is missing or invalid, it defaults to a specified “404” image.

5. Error Handling and Debugging

Debug logging and error handling ensure that if data can’t be fetched, the placeholders are either left unchanged or logged for troubleshooting.

This approach provides a smoother user experience by managing both loading time and visual stability, which are critical for preventing CLS in dynamically loaded content.

The new code is active on this site, and there’s not only a huge visual improvement, but also serious performance gains. I’ll give it a few weeks, then formally release the new code.

[phenomlab]

And now, changes made to the back-end Proxy Server to increase performance

Key Changes Made:

1. Rate Limiting

Added express-rate-limit to limit requests from a single IP.

2. Logging

Integrated morgan for logging HTTP requests.

3. Health Check Endpoint

Added a simple endpoint to check the server’s status.

4. Data Validation

Implemented input validation for the URL using Joi.

5. Environment Variables

Used dotenv for managing sensitive data like API keys and port configuration.

6. Error Handling

Enhanced error logging for debugging purposes.

7. Asynchronous Error Handling

Utilize a centralized error-handling middleware to manage errors in one place.

8. Environment Variable Management

Use environment variables for more configuration options, such as cache duration or allowed origins, making it easier to change configurations without altering the code.

9. Static Response Handling

Use a middleware for handling static responses or messages instead of duplicating logic.

10. Compression Middleware

Add compression middleware to reduce the size of the response bodies, which can improve performance, especially for larger responses.

11. Timeout Handling on Requests

Handle timeouts for the requests made to the target URLs and provide appropriate error responses.

12. Security Improvements

Implement security best practices, such as Helmet for setting HTTP headers, which can help protect against well-known vulnerabilities.

13. Logging Configuration

Improve logging with different levels (e.g., info, error) using a logging library like winston, which provides more control over logging output.

14. Graceful Shutdown

Implement graceful shutdown logic to handle server termination more smoothly, especially during deployment.

15. Monitoring and Metrics

Integrate monitoring tools like Prometheus or an APM tool for better insights into the application’s performance and resource usage.

16. Response Schema Validation

Use libraries like Joi or Ajv to validate responses sent back to the client, ensuring they conform to expected formats.

Again, this new code is running here in test for a few weeks.

[DownPW]

wowww

Very good work my friend!!

[JAC]

@phenomlab the best of the best, great work Mark .

[phenomlab]

Seeing as not every site on the planet has relevant CORS headers that permit data scraping, I thought I’d make this a bit more obvious on the response. The link is still rendered, but by using the below if the remote site refuses to respond to request

Not entirely sold on the image yet - likely will change it, but you get the idea It’s more along the lines of graceful failure rather than a URL that simply does nothing.

[Madchatthew]

@phenomlab I love that image and think it is perfect! LOL

[DownPW]

@phenomlab said in OGProxy - a replacement for iFramely:

And now, changes made to the back-end Proxy Server to increase performance

Key Changes Made:

1. Rate Limiting

Added express-rate-limit to limit requests from a single IP.

2. Logging

Integrated morgan for logging HTTP requests.

3. Health Check Endpoint

Added a simple endpoint to check the server’s status.

4. Data Validation

Implemented input validation for the URL using Joi.

5. Environment Variables

Used dotenv for managing sensitive data like API keys and port configuration.

6. Error Handling

Enhanced error logging for debugging purposes.

7. Asynchronous Error Handling

Utilize a centralized error-handling middleware to manage errors in one place.

8. Environment Variable Management

Use environment variables for more configuration options, such as cache duration or allowed origins, making it easier to change configurations without altering the code.

9. Static Response Handling

Use a middleware for handling static responses or messages instead of duplicating logic.

10. Compression Middleware

Add compression middleware to reduce the size of the response bodies, which can improve performance, especially for larger responses.

11. Timeout Handling on Requests

Handle timeouts for the requests made to the target URLs and provide appropriate error responses.

12. Security Improvements

Implement security best practices, such as Helmet for setting HTTP headers, which can help protect against well-known vulnerabilities.

13. Logging Configuration

Improve logging with different levels (e.g., info, error) using a logging library like winston, which provides more control over logging output.

14. Graceful Shutdown

Implement graceful shutdown logic to handle server termination more smoothly, especially during deployment.

15. Monitoring and Metrics

Integrate monitoring tools like Prometheus or an APM tool for better insights into the application’s performance and resource usage.

16. Response Schema Validation

Use libraries like Joi or Ajv to validate responses sent back to the client, ensuring they conform to expected formats.

Again, this new code is running here in test for a few weeks.

code updated on github or not ?

[phenomlab]

@DownPW Not yet. One or two bugs left to resolve, then it’ll be posted.

[DownPW]

Ok I’ll install the old version in the meantime… Or maybe just wait if it’s not too long