Ability to resize remote images

[sudokai]

Add the ability to resize remote images by specifying the remote url as the last parameter of the url:

/300x400/crop/s/{remoteUrl}

remoteUrl should be a full remote url: https://example.com/example.jpg

Given the example above, the original image should be cached locally as {originalCacheDir}/example.com/example.jpg and the thumbnail as {thumbnailCacheDir}/300x400/crop/s/example.com/example.jpg.

Expose a configuration property to enable remote image resizing.

Check net/http and api/routes.go to get started.

[ptisserand]

I will look at it.

[sudokai]

Any progress on this?

[ptisserand]

Sorry, no progress on this.
I have just look at code to download remote file.

Also I'm still wondering how to give remote url to imageresizer.
Do you think we could use something like:
/url=URL_ENCODED

[sudokai]

I think the last parameter should just be the full url. I'm against encoding the url because it lowers usability and readability.
Example:
/300x400/crop/s/https://example.com/example.jpg?v=123

Please do keep in mind that the remote url can have a query string.

[ptisserand]

I have just created a pull request for first review.
There is still some work to be done specially for security purpose.
Also I didn't yet add test case for remote image downloading.

[sudokai]

Looks good, I believeRemoteToLocalPath doesn't need to be exported.