Security fix: Add 404 check when creating add to cart url for single …

[timbocode]

…products

Backport from woocommerce/woocommerce@dc1438d

See also #214

This PR also covers the following commits:

• woocommerce/woocommerce@badb135
• woocommerce/woocommerce@f7a5449

WC commits badb135 and f7a5449 are identical.

WC commit dc1438d includes the changes made in the above two commits as well as other changes, making badb135 and f7a5449 superfluous.

Files changed

includes/class-wc-product-simple.php

[codecov-io]

Codecov Report

Merging #227 into master will decrease coverage by <.01%.
The diff coverage is 0%.

@@             Coverage Diff              @@
##             master     #227      +/-   ##
============================================
- Coverage     40.82%   40.82%   -0.01%     
- Complexity    13447    13451       +4     
============================================
  Files           367      367              
  Lines         51277    51282       +5     
============================================
  Hits          20936    20936              
- Misses        30341    30346       +5

Impacted Files	Coverage Δ	Complexity Δ
includes/class-wc-product-simple.php	42.1% <0%> (-15.04%)	15 <0> (+4)

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[timbocode]

Testing

• Manually checked adding single product to cart.

[bahiirwa]

Similar manual test done to add products to cart and there are no hiccups as a manual user. Purchase process is executed well. No admin issues seen either.