Allow uploading .zip, .rar, and .7z files from disk. The archive will be extracted and the images
inside will be uploaded.
This only works for archive files uploaded from disk, not from a source URL.
Post source URLs will look something like this: "file://foo.zip/1.jpg", "file://foo.zip/2.jpg", etc.
Sometimes artists uses Shift JIS or other encodings instead of UTF-8 for filenames. In these cases
we just assume the filename is UTF-8 and replace invalid characters with '?', so filenames might be
wrong in some cases.
There are various protections to prevent uploading malicious archive files:
* Archives with more than 100 files aren't allowed.
* Archives that decompress to more than 100MB aren't allowed.
* Archives with filenames containing '..' components aren't allowed (e.g. '../../../../../etc/passwd').
* Archives with filenames containing absolute paths aren't allowed (e.g. '/etc/passwd').
* Archives containing symlinks aren't allowed (e.g. 'foo -> /etc/passwd').
* Archive types other than .zip, .rar, and .7z aren't allowed (e.g. .tar.gz, .cpio).
* File permissions, owners, and other metadata are ignored.
Partial fix for #5340: Add support for extracting archive attachments from certain sources
This directory contains library code used through Danbooru. This includes things like defining API clients, dealing with
sources, parsing tag searches, storing and resizing images, and so on.
Many of the files here use the Service Object pattern. Instead of putting complex code in models or controllers, it goes
here, in plain old Ruby objects (POROs). This keeps models and controllers simpler, and keeps domain logic isolated and
independent from the database and the HTTP request cycle.
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