[Fix] use unrestricted http client only for non-safe requests (#3847)

* exposed a MethodIsSafe() to reuse it in OpsGenie Analyzer.
Use Restricted Client for non-safe APIs.

* Renamed MethodIsSafe to IsMethodSafe for more clarity

pkg/analyzer/analyzers/client.go

@@ -114,7 +114,7 @@ type AnalyzerRoundTripper struct {
 
 func (r AnalyzerRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
 	resp, err := r.parent.RoundTrip(req)
-	if err != nil || methodIsSafe(req.Method) {
+	if err != nil || IsMethodSafe(req.Method) {
 		return resp, err
 	}
 	// Check that unsafe methods did NOT return a valid status code.
@@ -126,7 +126,7 @@ func (r AnalyzerRoundTripper) RoundTrip(req *http.Request) (*http.Response, erro
 
 // methodIsSafe is a helper method to check whether the HTTP method is safe according to MDN Web Docs.
 // https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods#safe_idempotent_and_cacheable_request_methods
-func methodIsSafe(method string) bool {
+func IsMethodSafe(method string) bool {
 	switch strings.ToUpper(method) {
 	case http.MethodGet, http.MethodHead, http.MethodOptions, http.MethodTrace:
 		return true

pkg/analyzer/analyzers/opsgenie/opsgenie.go

@@ -132,7 +132,16 @@ func (h *HttpStatusTest) RunTest(cfg *config.Config, headers map[string]string)
 	}
 
 	// Create new HTTP request
-	client := analyzers.NewAnalyzeClientUnrestricted(cfg)
+	var client *http.Client
+
+	// Non-safe Opsgenie APIs are asynchronous and always return 202 if credential has the permission.
+	// For Safe API Methods, use the restricted client
+	if analyzers.IsMethodSafe(h.Method) {
+		client = analyzers.NewAnalyzeClient(cfg)
+	} else {
+		client = analyzers.NewAnalyzeClientUnrestricted(cfg)
+	}
+
 	req, err := http.NewRequest(h.Method, h.Endpoint, data)
 	if err != nil {
 		return false, err