IPFS URI should be loaded over localhost, not 127.0.0.1

[stephendonner]

Description

IPFS URI should be loaded over localhost, not 127.0.0.1

Steps to Reproduce

1. Install IPFS Desktop and it should be started on port 8080
2. Load http://127.0.0.1:8080/ipfs/QmV4FVfWRG4hJJKUsS1aU9MK85HYFJtuCmYAj8HetS8qMS. It should load the content but retain the https://localhost/ipfs/QmV4FVfWRG4hJJKUsS1aU9MK85HYFJtuCmYAj8HetS8qMS URI in the address bar.

Actual result:

The URI is http://127.0.0.1:8080/ipfs/QmV4FVfWRG4hJJKUsS1aU9MK85HYFJtuCmYAj8HetS8qMS

Expected result:

According to #13872 (comment), the URI should be https://localhost/ipfs/QmV4FVfWRG4hJJKUsS1aU9MK85HYFJtuCmYAj8HetS8qMS, with localhost rather than 127.0.0.1

Reproduces how often:

Brave version (brave://version info)

Brave	1.23.19 Chromium: 89.0.4389.72 (Official Build) nightly (x86_64)
Revision	3f345f156bfd157bd1bea06310e55f3fb2490359-refs/branch-heads/4389@{#1393}
OS	macOS Version 11.2.2 (Build 20D80)

Version/Channel Information:

• Can you reproduce this issue with the current release? no
• Can you reproduce this issue with the beta channel? yes
• Can you reproduce this issue with the nightly channel? yes

cc: @spylogsster @lidel

[lidel]

This is a sensible request and a security fix (raw IP can't have subdomains, so it won't provide origin isolation).
IPFS Companion enforces use of localhost by default, because that is the only way to provide origin isolation per CID (gateway will redirect to proper subdomain, so nothing else needs to be done).

The fix here is to detect requests to 127.0.0.1 and port of local gateway, and redirect them to localhost name

[spylogsster]

Added replacement 127.0.0.1 to localhost for default gateway. If we setup the public gateway to http://127.0.0.1:8080/, the url will be converted to localhost, but the address bar finally will retain ipfs://bafybeiddzzce2l4stkz6fotj7hugeyehtv3kobcku2jvrakgpiqgx4j6fe/ cc @lidel

[stephendonner]

Verified FIXED using beta build with the testplan from brave/brave-core#8263

Brave	1.23.43 Chromium: 89.0.4389.90 (Official Build) beta (x86_64)
Revision	62eb262cdaae9ef819aadd778193781455ec7a49-refs/branch-heads/4389@{#1534}
OS	macOS Version 11.2.3 (Build 20D91)

Steps:

1. Install IPFS Desktop and it should be started on port 8080
2. Set public gateway to http://127.0.0.1:8080/
3. Load http://127.0.0.1:8080/ipfs/QmV4FVfWRG4hJJKUsS1aU9MK85HYFJtuCmYAj8HetS8qMS
4. It should load the content but retain the ipfs://bafybeiddzzce2l4stkz6fotj7hugeyehtv3kobcku2jvrakgpiqgx4j6fe/

Verified when I loaded http://127.0.0.1:8080/ipfs/QmV4FVfWRG4hJJKUsS1aU9MK85HYFJtuCmYAj8HetS8qMS that it redirected to/retained ipfs://bafybeiddzzce2l4stkz6fotj7hugeyehtv3kobcku2jvrakgpiqgx4j6fe/ in the URL bar.