Unable to import external jpeg images from a CDN with dynamic URLs.

[dromoded]

Unable to import products with external jpeg images hosted on a CDN with dynamic URLs not ending with ".jpg" or ".jpeg", e.g.
http://asset.lemansnet.com/media/edge/8/4/0/840EC331-41BE-4AFF-9392-4A35F2C486A9.png?x=260&y=260&b=ffffff&t=image/jpeg
(This is a real image, and it is indeed a jpeg. Parameters "x" and "y" control image size, "b" - background color)

The same procedure as described below succeeds for a "plain" image URL (verified for
http://cdn.cnn.com/cnnnext/dam/assets/160405140459-06-nba-finals-superlatives-tease-only-large-tease.jpg )

Preconditions

1. Magento 2.2.1 CE, Composer install
2. CentOS-7, PHP-7.0.25, NGINX-1.12 + PHP-FPM, Percona-5.7.19
3. "2-users" setup as described in the installation manual (usermod -a -G nginx maguser, FPM owned by nginx, sgid on directories)

Steps to reproduce

1. Create the following CSV import file:

sku,product_type,attribute_set_code,name,price,base_image
12345,simple,Default,Test,10,http://asset.lemansnet.com/media/edge/8/4/0/840EC331-41BE-4AFF-9392-4A35F2C486A9.png?x=260&y=260&b=ffffff&t=image/jpeg

2. Magento > Admin > System > Import:
   Entity Type: Products
   Import Behavior: Add/Update
   Stop on Error
   Allowed Errors Count: 10
   Field Separator: ,
   Multiple Value Separator: ,
   Field Enclosure: checked
   Select File to Import: the file created in step 1
   Images File Directory: (left empty)
3. Click "Check Data"
   Click "Import"

Expected result

1. Product "Test", should be created with the base image, as specified in the import file.
2. The product should appear in the Admin>Catalog>Products list with the specified base image.
3. The image should be downloaded and saved in ~/pub/media/catalog/product/h/t

Actual result

1. "Check Data" returns 'File is valid! To start import process press "Import" button'
   Import returns the following error:
   "Imported resource (image) could not be downloaded from external resource due to timeout or access permissions in row(s): 1"
2. Product "Test" is created and appears in Admin>Catalog>Products as specified minus image.
3. The image is downloaded and saved in ~/pub/media/import with the file name
   httpasset.lemansnet.commediaedge840840EC331-41BE-4AFF-9392-4A35F2C486A9.pngx260y260bfffffftimagejpeg
   (verified that it is indeed the right jpeg image file)

[magento-engcom-team]

@dromoded, thank you for your report.
We've created internal ticket(s) MAGETWO-84958 to track progress on the issue.

[EliasZ]

This is related to: #12455

Not exactly the same, but similar problem case. In this case GET params are present in the URL and due to regex stripping characters, the GET params are appended to the file extension resulting in breaking the validation rules.