feat: Add Support for Proxy with Interceptor (#77)

examples/proxy/logging_interceptor.go

@@ -0,0 +1,50 @@
+package main
+
+import (
+	"fmt"
+	"time"
+
+	"github.com/safedep/pmg/proxy"
+)
+
+type loggingInterceptor struct {
+	domains []string
+}
+
+func newLoggingInterceptor() *loggingInterceptor {
+	return &loggingInterceptor{
+		domains: []string{
+			"registry.npmjs.org",
+			"registry.yarnpkg.com",
+			"pypi.org",
+			"files.pythonhosted.org",
+		},
+	}
+}
+
+func (li *loggingInterceptor) Name() string {
+	return "logging-interceptor"
+}
+
+func (li *loggingInterceptor) ShouldIntercept(ctx *proxy.RequestContext) bool {
+	for _, domain := range li.domains {
+		if ctx.Hostname == domain {
+			return true
+		}
+	}
+
+	return false
+}
+
+func (li *loggingInterceptor) HandleRequest(ctx *proxy.RequestContext) (*proxy.InterceptorResponse, error) {
+	fmt.Printf("LOGGING INTERCEPTOR: [%s] %s %s %s\n",
+		ctx.StartTime.Format(time.RFC3339),
+		ctx.RequestID,
+		ctx.Method,
+		ctx.URL.String(),
+	)
+
+	return &proxy.InterceptorResponse{
+		Action: proxy.ActionAllow,
+	}, nil
+}