Add custom applicaton support (work in progress)

[mvantellingen]

Example usage::

newClient.CustomApplicationGetWithID(context.TODO(), "ckcmb5qvmzpes0714901hx27v")

draft := &commercetools.CustomApplicationDraft{
	Name: "terraform-test",
	NavbarMenu: commercetools.CustomApplicationNavbarMenu{
		Key:         "foobar",
		URIPath:     "no-idea",
		Permissions: []string{"ViewCategories"},
		LabelAllLocales: []commercetools.CustomApplicationLabelLocale{
			commercetools.CustomApplicationLabelLocale{
				Locale: "NL",
				Value:  "Michael Test",
			},
		},
		Submenu: []commercetools.CustomApplicationNavbarSubmenu{},
	},
}

app, err := newClient.CustomApplicationCreate(context.TODO(), draft)
if err != nil {
	panic(err)
}

[codecov[bot]]

Codecov Report

Merging #52 (c7d2465) into master (1c49bc0) will decrease coverage by 4.65%. The diff coverage is 31.61%.

@@            Coverage Diff             @@
##           master      #52      +/-   ##
==========================================
- Coverage   15.53%   10.88%   -4.66%     
==========================================
  Files          70       69       -1     
  Lines       15246    15272      +26     
==========================================
- Hits         2369     1662     -707     
- Misses      12360    13354     +994     
+ Partials      517      256     -261     

Impacted Files	Coverage Δ
commercetools/client.go	60.37% <ø> (-5.67%)	:arrow_down:
commercetools/service_custom_applications.go	25.00% <25.00%> (ø)
commercetools/client_graphql.go	73.13% <62.96%> (+73.13%)	:arrow_up:
commercetools/service_message.go	0.00% <0.00%> (-60.00%)	:arrow_down:
commercetools/service_product_projection.go	11.90% <0.00%> (-33.34%)	:arrow_down:
commercetools/service_review.go	0.00% <0.00%> (-31.47%)	:arrow_down:
commercetools/service_payment.go	0.00% <0.00%> (-31.47%)	:arrow_down:
commercetools/service_shopping_list.go	0.00% <0.00%> (-31.47%)	:arrow_down:
commercetools/service_discount_code.go	0.00% <0.00%> (-30.77%)	:arrow_down:
commercetools/service_category.go	0.00% <0.00%> (-29.89%)	:arrow_down:
... and 36 more

---

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[mvantellingen]

@emmenko which permissions do we need to actually create a custom application. Retrieving works fine but when creating a new one I receive the following

{"errors":[{"message":"Missing or invalid authentication token.","locations":[{"line":3,"column":4}],"path":["createProjectExtensionApplication"],"extensions":{"code":"UNAUTHENTICATED"}}],"data":{"createProjectExtensionApplication":null}}

[emmenko]

Hi @mvantellingen , thanks for taking over 🙏

To manage custom applications, you need an access token with the scope manage_project_settings. For retrieving a custom application, you simply need an access token with access to the project (could be any scope).

Let me know if you need any more assist. I'm also happy to review the PR if you need me to. Thanks

[emmenko]

FYI: we're planning to change some things about how you manage and register Custom Applications. The current API should stay for backwards compatibility, but there would be a new one.

I'll get in touch once we have it in place.

[mvantellingen]

FYI: we're planning to change some things about how you manage and register Custom Applications. The current API should stay for backwards compatibility, but there would be a new one.

I'll get in touch once we have it in place.

Hi @emmenko,

I would like to take some steps to get the support in the terraform provider (we really need it for a couple of components we are creating). Is the new API already available?

[demeyerthom]

Custom apps can only be configured through the GraphQL instead