refactor(pkg/test): split logic in pkg/test/common.go into multiple packages (#1861)

Which could be imported independently. See more details:
1. "zotregistry.io/zot/pkg/test/common" - currently used as
   tcommon "zotregistry.io/zot/pkg/test/common" - inside pkg/test
   test "zotregistry.io/zot/pkg/test/common" - in tests
   . "zotregistry.io/zot/pkg/test/common" - in tests
Decouple zb from code in test/pkg in order to keep the size small.

2. "zotregistry.io/zot/pkg/test/image-utils" - curently used as
   . "zotregistry.io/zot/pkg/test/image-utils"

3. "zotregistry.io/zot/pkg/test/deprecated" -  curently used as
   "zotregistry.io/zot/pkg/test/deprecated"
This one will bre replaced gradually by image-utils in the future.

4. "zotregistry.io/zot/pkg/test/signature" - (cosign + notation) use as
   "zotregistry.io/zot/pkg/test/signature"

5. "zotregistry.io/zot/pkg/test/auth" - (bearer + oidc)  curently used as
   authutils "zotregistry.io/zot/pkg/test/auth"

 6. "zotregistry.io/zot/pkg/test/oci-utils" -  curently used as
   ociutils "zotregistry.io/zot/pkg/test/oci-utils"

Some unused functions were removed, some were replaced, and in
a few cases specific funtions were moved to the files they were used in.

Added an interface for the StoreController, this reduces the number of imports
of the entire image store, decreasing binary size for tests.
If the zb code was still coupled with pkg/test, this would have reflected in zb size.

Signed-off-by: Andrei Aaron <aaaron@luxoft.com>

cmd/zb/helper.go

@@ -8,6 +8,7 @@ import (
 	"log"
 	"math/rand"
 	"net/http"
+	"net/url"
 	"os"
 	"path"
 	"sync"
@@ -21,8 +22,6 @@ import (
 
 	zerr "zotregistry.io/zot/errors"
 	"zotregistry.io/zot/pkg/common"
-	testc "zotregistry.io/zot/pkg/test/common"
-	"zotregistry.io/zot/pkg/test/image-utils"
 )
 
 func makeHTTPGetRequest(url string, resultPtr interface{}, client *resty.Client) error {
@@ -344,7 +343,7 @@ func pushMonolithImage(workdir, url, trepo string, repos []string, config testCo
 			resp.StatusCode(), string(resp.Body())) //nolint: goerr113
 	}
 
-	loc := testc.Location(url, resp)
+	loc := getLocation(url, resp)
 
 	var size int
 
@@ -398,8 +397,8 @@ func pushMonolithImage(workdir, url, trepo string, repos []string, config testCo
 			resp.StatusCode(), string(resp.Body()))
 	}
 
-	loc = testc.Location(url, resp)
-	cblob, cdigest := getRandomImageConfig()
+	loc = getLocation(url, resp)
+	cblob, cdigest := getImageConfig()
 	resp, err = client.R().
 		SetContentLength(true).
 		SetHeader("Content-Length", fmt.Sprintf("%d", len(cblob))).
@@ -526,7 +525,7 @@ func pushMonolithAndCollect(workdir, url, trepo string, count int,
 			return
 		}
 
-		loc := testc.Location(url, resp)
+		loc := getLocation(url, resp)
 
 		var size int
 
@@ -594,8 +593,8 @@ func pushMonolithAndCollect(workdir, url, trepo string, count int,
 			return
 		}
 
-		loc = testc.Location(url, resp)
-		cblob, cdigest := getRandomImageConfig()
+		loc = getLocation(url, resp)
+		cblob, cdigest := getImageConfig()
 		resp, err = client.R().
 			SetContentLength(true).
 			SetHeader("Content-Length", fmt.Sprintf("%d", len(cblob))).
@@ -730,7 +729,7 @@ func pushChunkAndCollect(workdir, url, trepo string, count int,
 			return
 		}
 
-		loc := testc.Location(url, resp)
+		loc := getLocation(url, resp)
 
 		var size int
 
@@ -768,7 +767,7 @@ func pushChunkAndCollect(workdir, url, trepo string, count int,
 			return
 		}
 
-		loc = testc.Location(url, resp)
+		loc = getLocation(url, resp)
 
 		// request specific check
 		statusCode = resp.StatusCode()
@@ -822,8 +821,8 @@ func pushChunkAndCollect(workdir, url, trepo string, count int,
 			return
 		}
 
-		loc = testc.Location(url, resp)
-		cblob, cdigest := getRandomImageConfig()
+		loc = getLocation(url, resp)
+		cblob, cdigest := getImageConfig()
 		resp, err = client.R().
 			SetContentLength(true).
 			SetHeader("Content-Type", "application/octet-stream").
@@ -859,7 +858,7 @@ func pushChunkAndCollect(workdir, url, trepo string, count int,
 			return
 		}
 
-		loc = testc.Location(url, resp)
+		loc = getLocation(url, resp)
 
 		// request specific check
 		statusCode = resp.StatusCode()
@@ -1020,9 +1019,21 @@ func loadOrStore(statusRequests *sync.Map, key string, value int) int { //nolint
 	return intValue
 }
 
-// TO DO: replace with pkg/test/images when available.
-func getRandomImageConfig() ([]byte, godigest.Digest) {
-	config := image.GetDefaultConfig()
+func getImageConfig() ([]byte, godigest.Digest) {
+	createdTime := time.Date(2011, time.Month(1), 1, 1, 1, 1, 0, time.UTC)
+
+	config := ispec.Image{
+		Created: &createdTime,
+		Author:  "ZotUser",
+		Platform: ispec.Platform{
+			OS:           "linux",
+			Architecture: "amd64",
+		},
+		RootFS: ispec.RootFS{
+			Type:    "layers",
+			DiffIDs: []godigest.Digest{},
+		},
+	}
 
 	configBlobContent, err := json.MarshalIndent(&config, "", "\t")
 	if err != nil {
@@ -1033,3 +1044,21 @@ func getRandomImageConfig() ([]byte, godigest.Digest) {
 
 	return configBlobContent, configBlobDigestRaw
 }
+
+func getLocation(baseURL string, resp *resty.Response) string {
+	// For some API responses, the Location header is set and is supposed to
+	// indicate an opaque value. However, it is not clear if this value is an
+	// absolute URL (https://server:port/v2/...) or just a path (/v2/...)
+	// zot implements the latter as per the spec, but some registries appear to
+	// return the former - this needs to be clarified
+	loc := resp.Header().Get("Location")
+
+	uloc, err := url.Parse(loc)
+	if err != nil {
+		return ""
+	}
+
+	path := uloc.Path
+
+	return baseURL + path
+}