News: Feeds where assets are led with // are erroneously prefixed with the domain base URL

[HanFox]

• [x] I have read the CONTRIBUTING.md and followed the provided tips

Explain the Problem

In 14.1.7 feeds where assets (such as images) are led with // (instead of http:// or https://) will be erroneously prefixed with the domain base URL (i.e. https://domain.tld//domain.tld/path/to/asset).

The issue does not exist in 14.1.6.

Steps to Reproduce

Explain what you did to encounter the issue

1. Find a feed where assets are prefixed with // (sorry, I can't provide the feed that has the error)
2. Load feed in to News app
3. Note that assets don't load and instead will place the base domain before the // (i.e. https://domain.tld//domain.tld/path/to/asset)

System Information

• News app version: 14.1.7
• Nextcloud version: 18.0.4
• Cron type: Cron
• PHP version: 7.4.5
• Database and version: MariaDB v10.4.12
• Browser and version: Firefox 76.0.1
• Distribution and version: Arch Linux (rolling)

Contents of nextcloud/data/nextcloud.log

There are no errors in there that pertain to this issue.

Contents of Browser Error Console

There are no errors in there that pertain to this issue.

[SMillerDev]

@alexdebril any idea?

[alexdebril]

Yes, It's my fault. When implementing the relative to absolute URL transformation, I assumed that no one would use // instead of the http:// or https:// scheme ...
I'll prepare a patch very soon to fix this.

Really sorry for that :(

[alexdebril]

v4.6.2 fixes it

[Grotax]

Thanks @alexdebril
Fix included in 14.1.8