Allow logo upload

[trugwaldsaenger]

As an editor I would like to upload logos to the platform. This would be helpful in the case, that a trusted link to the logo cannot be found.

[literarymachine]

For clarification: @philboeselager implemented the back end side of this in #572, we haven't had a chance yet to pull this into the front end though.

[mandrasch]

I like the upload file / add file via URL option on www.uploadcare.com

[tamielbr]

It seems like this might be important in cases where image location exists, is valid, but doesn't seem to get pulled, for example:

• https://oerworldmap.org/resource/urn:uuid:a70ce2b8-8202-4fa7-b24b-53a7d163ddb9
• https://oerworldmap.org/resource/urn:uuid:45c5700d-b0ea-4723-884e-4c91b804bfe1
• https://oerworldmap.org/resource/urn:uuid:9ff7ecf2-161f-4d56-8622-9c35365ff144

[literarymachine]

It seems like this might be important in cases where image location exists, is valid, but doesn't seem to get pulled, for example:

Interesting that you are experiencing this right away, this behavior has been implemented a couple of hours ago in https://github.com/hbz/oerworldmap-ui/pull/569. We are stripping the scheme part of the image url, effectively always requesting them via https. Non of the images in the above examples can be requested properly using https.

[mandrasch]

Mh the same problem Google, Firefox & Co are facing regarding their move to forbid http :) :/ https://www.engadget.com/2019/10/04/chrome-security-block-http-content/?guccounter=1

What about image caching (User enters URL, World Map copies it to a file storage, like a CDN?)? It would also solve the privacy challenge regarding connections to third party pages.