Adds MRI previewer for NIFTY (.nii) file format.

[pgroves]

Description

Adds an MRI previewer that is being used on the PigBrainMRI project with Dilger's lab. See the README.md in the previewer directory for details.

Review Time Estimate

• Immediately
• [x ] Within one week
• When possible

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• [ x] New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the CHANGELOG.md.
• I have signed the CLA
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[pgroves]

There is a problem ... since I moved the previewer from custom/public/ into public/ the gzipped versions of the images don't work (the previewer doesn't load at all). On my deployment where the previewer is in custom/, a file with extension .nii.gz loads the previewer as expected, but nothing happens on the deployment I'm testing this PR with. I don't know how to debug such a thing... the javascript console doesn't show any errors.

[lmarini]

There is a problem ... since I moved the previewer from custom/public/ into public/ the gzipped versions of the images don't work (the previewer doesn't load at all). On my deployment where the previewer is in custom/, a file with extension .nii.gz loads the previewer as expected, but nothing happens on the deployment I'm testing this PR with. I don't know how to debug such a thing... the javascript console doesn't show any errors.

I have the same problem. I manually unzipped them and it worked fine. What do you have in your custom mimetypes.conf on your deployment? In this pr you have only included mimetype.nii=image/nii. I tried adding mimetype.nii.gz=image/nii but it doesn't like it because of the extra fragments.

[pgroves]

There is a problem ... since I moved the previewer from custom/public/ into public/ the gzipped versions of the images don't work (the previewer doesn't load at all). On my deployment where the previewer is in custom/, a file with extension .nii.gz loads the previewer as expected, but nothing happens on the deployment I'm testing this PR with. I don't know how to debug such a thing... the javascript console doesn't show any errors.

I have the same problem. I manually unzipped them and it worked fine. What do you have in your custom mimetypes.conf on your deployment? In this pr you have only included mimetype.nii=image/nii. I tried adding mimetype.nii.gz=image/nii but it doesn't like it because of the extra fragments.

I don't see anything else with mimetypes in the working version in custom. You can see it all here:
https://github.com/ncsa/clowder-dilger-ops/tree/main/custom

The only other thing I can think of is that the working version is using the official docker images but I rebuilt the clowder image to test this (from whatever was on master yesterday).

FYI here is what it looks like in the working version, the mimetype is just application/gzip. Reading a little about mimetypes this seems ok b/c gzip is the encoding, not really the mimetype, and the mimetype ecosystem seems to treat zips as a special case. But obviously it all depends on the library you're using.

[CLAassistant]

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✅ lmarini
❌ pgroves
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[lmarini]

I added application/gzip to the file types it triggers on and everything worked well with my test example. Also added changelog and your name to contributing. Thank you!