I'm looking for a solution, where users of my site can use an image search engine (e.g. Google), instead of uploading an image, they can search and pick one of the results.
My problem is:
Which Google API is ment to search images on the internet? Would it be plausible to include normal image search in an iframe, and somehow capture an image selection (i.e. when clicked)?
Google made it really difficult:
TL;DR: You have to use Google custom search, add a random site when creating the API key, afterwards you can tweak the settings to search the entire web instead.