[Android] Localhost permission

[ShivanKaul]

Android port of #27346

When feature is on:

1. Prompt users for localhost permission when visiting websites that make connections to localhost subresources.
2. Have an entry for Localhost in Site Settings in Settings. Adding/subtracting exceptions should work.

[Uni-verse]

Verified on Samsung Galaxy S21 using the following version(s):

Brave	1.52.112 Chromium: 114.0.5735.35 (Official Build) (64-bit) 
Revision	2295354895fa3652ae47b651481831484f16d1ff-refs/branch-heads/5735@{#713}
OS	Android 13; Build/TP1A.220624.014; 33; REL

Android Localhost permission testing prerequisites:

1. Install Simple HTTP server (by Phlox Development) from GPS on Android device.
2. Launch the app, allow necessary app permissions and start the server with default values. Confirm status is running.
3. Launch Brave app, open new tab and navigate to http://localhost:8000 in the url bar, confirm you are able to access localhost server.
4. Open terminal window and make sure device is connected via adb. Confirm app data folder location for simple http server by using the following command: adb shell ls /storage/emulated/0/Android/data/com.phlox.simpleserver/files
5. If simple http server is not found in this path, locate it in the device storage by searching in directories in /storage
6. Download logo.png in the below images and cd into the directory containing the downloaded image. Use this adb command to push the png to the http server root directory in the android device: adb push ./logo.png /storage/emulated/0/Android/data/com.phlox.simpleserver/files/logo.png
7. Update the tab where localhost is running in brave app and it should now show the logo.png in the root directory. Tap on the file in the list to open the logo image.
8. Enable the feature flag #brave-localhost-access-permission in brave://flags, relaunch app
9. Navigate to brave://adblock and enter this rule in the custom ad block field ||localhost^$domain=shivankaul.com

Step 1	Step 2	Step 3	Step 7	Step 7	Logo.png

Note: Make sure to complete the steps above before moving on to test scenarios in https://shivankaul.com/brave/localhost/ in the test plan mentions below. When running through the test cases, make sure your http server port value / resource name corresponds to the localhost uri parameters in the page source for the tests in https://shivankaul.com/brave/localhost/ (example below).

Using test plan in brave/brave-core#17321 (comment)

• Ensured loading subresource image test page will prompt user with permission dialog,
• Ensured loading server worker test page will prompt user with permission dialog.
• Ensured loading websockets test page will prompt user with permission dialog.
• Ensured loading iframe test page will prompt user with permission dialog.
• Ensured that allowing localhost permission on test pages will load the resource.
• Ensured selecting localhost permission will set the appropriate exception for the domain under localhost in site settings.
• Ensured changing exception from allow to block or vice versa will be applied on the test page.
• Ensured manually enter exception site under site settings works.

Example	Example	Example	Example	Example	Example

[Uni-verse]

Verified on Samsung Galaxy Tab S7 using the following version(s):

Brave	1.52.112 Chromium: 114.0.5735.35 (Official Build) (64-bit) 
Revision	2295354895fa3652ae47b651481831484f16d1ff-refs/branch-heads/5735@{#713}
OS	Android 13; Build/TP1A.220624.014; 33; REL

Using test plan in brave/brave-core#17321 (comment)

• Ensured loading subresource image test page will prompt user with permission dialog,
• Ensured loading server worker test page will prompt user with permission dialog.
• Ensured loading websockets test page will prompt user with permission dialog.
• Ensured loading iframe test page will prompt user with permission dialog.
• Ensured that allowing localhost permission on test pages will load the resource.
• Ensured selecting localhost permission will set the appropriate exception for the domain under localhost in site settings.
• Ensured changing exception from allow to block or vice versa will be applied on the test page.
• Ensured manually enter exception site under site settings works.

Example	Example	Example	Example	Example