[BYOM] Handle Invalid Response Formats

[jonathansampson]

Description

Brave presently does only a superficial check against the format of the response when determining if it is valid or not. As a result, if a response contains a mostly-valid structure, but doesn't contain a "content" key on the first message, Brave will fail to handle this properly.

Steps to reproduce

Configure a server to respond with the following:

{"choices":[{"message":{"not_content":"value"}}]}

Actual result

The browser process will crash due to the absence of a "content" key.

Expected result

Brave should handle this more gracefully, and inform the user (at the very least) that the response format was invalid or otherwise unexpected.

Reproduces how often

Easily reproduced

Brave version (brave://version info)

1.74.50 Chromium: 132.0.6834.111 (Official Build) (64-bit)

Channel information

• release (stable)
• beta
• nightly

Reproducibility

• with Brave Shields disabled
• with Brave Rewards disabled
• in the latest version of Chrome

Miscellaneous information

No response