feat(repodb): add user related information to repodb (#1317)

Initial code was contributed by Bogdan BIVOLARU <104334+bogdanbiv@users.noreply.github.com>
Moved implementation from a separate db to repodb by Andrei Aaron <aaaron@luxoft.com>

Not done yet:
- run/test dynamodb implementation, only boltdb was tested
- add additional coverage for existing functionality
- add web-based APIs to toggle the stars/bookmarks on/off

Initially graphql mutation was discussed for the missing API but
we decided REST endpoints would be better suited for configuration



feat(userdb): complete functionality for userdb integration

- dynamodb rollback changes to user starred repos in case increasing the total star count fails
- dynamodb increment/decrement repostars in repometa when user stars/unstars a repo
- dynamodb check anonymous user permissions are working as intendend
- common test handle anonymous users
- RepoMeta2RepoSummary set IsStarred and IsBookmarked



feat(userdb): rest api calls for toggling stars/bookmarks on/off



test(userdb): blackbox tests



test(userdb): move preferences tests in a different file with specific build tags



feat(repodb): add is-starred and is-bookmarked fields to repo-meta

- removed duplicated logic for determining if a repo is starred/bookmarked

Signed-off-by: Laurentiu Niculae <niculae.laurentiu1@gmail.com>
Co-authored-by: Andrei Aaron <aaaron@luxoft.com>

pkg/common/common.go

@@ -40,6 +40,30 @@ func Contains(slice []string, item string) bool {
 	return false
 }
 
+// first match of item in [].
+func Index(slice []string, item string) int {
+	for k, v := range slice {
+		if item == v {
+			return k
+		}
+	}
+
+	return -1
+}
+
+// remove matches of item in [].
+func RemoveFrom(inputSlice []string, item string) []string {
+	var newSlice []string
+
+	for _, v := range inputSlice {
+		if item != v {
+			newSlice = append(newSlice, v)
+		}
+	}
+
+	return newSlice
+}
+
 func GetTLSConfig(certsPath string, caCertPool *x509.CertPool) (*tls.Config, error) {
 	clientCert := filepath.Join(certsPath, clientCertFilename)
 	clientKey := filepath.Join(certsPath, clientKeyFilename)