Add new auth package for bob API keys, and move oauth package to oauth folder

auth/api_key.go

+package auth
+
+import (
+	"github.com/google/uuid"
+	"gitlab.bob.co.za/bob-public-utils/bobgroup-go-utils/utils"
+	"strings"
+)
+
+// GenerateNewApiKey generates a 32 character API key. If the build environment is dev or stage the key will start with
+// "dev_" or "stage_" respectively.
+func GenerateNewApiKey() string {
+	uniqueKey := uuid.New().String()
+	uniqueKey = strings.ReplaceAll(uniqueKey, "-", "")
+
+	env := utils.GetEnv("ENVIRONMENT", "")
+	if env == "dev" || env == "stage" {
+		uniqueKey = env + "_" + uniqueKey
+	}
+
+	return uniqueKey
+}
+
+// GetApiKeyFromHeaders checks if a bearer token is passed as part of the Authorization header and returns that key
+func GetApiKeyFromHeaders(headers map[string]string) string {
+	key := headers["Authorization"]
+	if strings.HasPrefix(strings.ToLower(key), "bearer ") {
+		return strings.TrimPrefix(strings.ToLower(key), "bearer")
+	}
+	return ""
+}