Added restful-api plugin

- Added restful-api example plugin
- Added more plugin docs
- Added zoraxy_plugin HandleFunc API

example/plugins/restful-example/mod/zoraxy_plugin/README.txt

@@ -0,0 +1,19 @@
+# Zoraxy Plugin
+
+## Overview
+This module serves as a template for building your own plugins for the Zoraxy Reverse Proxy. By copying this module to your plugin mod folder, you can create a new plugin with the necessary structure and components.
+
+## Instructions
+
+1. **Copy the Module:**
+    - Copy the entire `zoraxy_plugin` module to your plugin mod folder.
+
+2. **Include the Structure:**
+    - Ensure that you maintain the directory structure and file organization as provided in this module.
+
+3. **Modify as Needed:**
+    - Customize the copied module to implement the desired functionality for your plugin.
+
+## Directory Structure
+ zoraxy_plugin: Handle -introspect and -configuration process required for plugin loading and startup
+ embed_webserver: Handle embeded web server routing and injecting csrf token to your plugin served UI pages

example/plugins/restful-example/mod/zoraxy_plugin/dev_webserver.go

@@ -0,0 +1,145 @@
+package zoraxy_plugin
+
+import (
+	"fmt"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+)
+
+type PluginUiDebugRouter struct {
+	PluginID         string //The ID of the plugin
+	TargetDir        string //The directory where the UI files are stored
+	HandlerPrefix    string //The prefix of the handler used to route this router, e.g. /ui
+	EnableDebug      bool   //Enable debug mode
+	terminateHandler func() //The handler to be called when the plugin is terminated
+}
+
+// NewPluginFileSystemUIRouter creates a new PluginUiRouter with file system
+// The targetDir is the directory where the UI files are stored (e.g. ./www)
+// The handlerPrefix is the prefix of the handler used to route this router
+// The handlerPrefix should start with a slash (e.g. /ui) that matches the http.Handle path
+// All prefix should not end with a slash
+func NewPluginFileSystemUIRouter(pluginID string, targetDir string, handlerPrefix string) *PluginUiDebugRouter {
+	//Make sure all prefix are in /prefix format
+	if !strings.HasPrefix(handlerPrefix, "/") {
+		handlerPrefix = "/" + handlerPrefix
+	}
+	handlerPrefix = strings.TrimSuffix(handlerPrefix, "/")
+
+	//Return the PluginUiRouter
+	return &PluginUiDebugRouter{
+		PluginID:      pluginID,
+		TargetDir:     targetDir,
+		HandlerPrefix: handlerPrefix,
+	}
+}
+
+func (p *PluginUiDebugRouter) populateCSRFToken(r *http.Request, fsHandler http.Handler) http.Handler {
+	//Get the CSRF token from header
+	csrfToken := r.Header.Get("X-Zoraxy-Csrf")
+	if csrfToken == "" {
+		csrfToken = "missing-csrf-token"
+	}
+
+	//Return the middleware
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Check if the request is for an HTML file
+		if strings.HasSuffix(r.URL.Path, ".html") {
+			//Read the target file from file system
+			targetFilePath := strings.TrimPrefix(r.URL.Path, "/")
+			targetFilePath = p.TargetDir + "/" + targetFilePath
+			targetFilePath = strings.TrimPrefix(targetFilePath, "/")
+			targetFileContent, err := os.ReadFile(targetFilePath)
+			if err != nil {
+				http.Error(w, "File not found", http.StatusNotFound)
+				return
+			}
+			body := string(targetFileContent)
+			body = strings.ReplaceAll(body, "{{.csrfToken}}", csrfToken)
+			w.Header().Set("Content-Type", "text/html")
+			w.WriteHeader(http.StatusOK)
+			w.Write([]byte(body))
+			return
+		} else if strings.HasSuffix(r.URL.Path, "/") {
+			//Check if the request is for a directory
+			//Check if the directory has an index.html file
+			targetFilePath := strings.TrimPrefix(r.URL.Path, "/")
+			targetFilePath = p.TargetDir + "/" + targetFilePath + "index.html"
+			targetFilePath = strings.TrimPrefix(targetFilePath, "/")
+			if _, err := os.Stat(targetFilePath); err == nil {
+				//Serve the index.html file
+				targetFileContent, err := os.ReadFile(targetFilePath)
+				if err != nil {
+					http.Error(w, "File not found", http.StatusNotFound)
+					return
+				}
+				body := string(targetFileContent)
+				body = strings.ReplaceAll(body, "{{.csrfToken}}", csrfToken)
+				w.Header().Set("Content-Type", "text/html")
+				w.WriteHeader(http.StatusOK)
+				w.Write([]byte(body))
+				return
+			}
+		}
+
+		//Call the next handler
+		fsHandler.ServeHTTP(w, r)
+	})
+
+}
+
+// GetHttpHandler returns the http.Handler for the PluginUiRouter
+func (p *PluginUiDebugRouter) Handler() http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		//Remove the plugin UI handler path prefix
+		if p.EnableDebug {
+			fmt.Print("Request URL:", r.URL.Path, " rewriting to ")
+		}
+
+		rewrittenURL := r.RequestURI
+		rewrittenURL = strings.TrimPrefix(rewrittenURL, p.HandlerPrefix)
+		rewrittenURL = strings.ReplaceAll(rewrittenURL, "//", "/")
+		r.URL.Path = rewrittenURL
+		r.RequestURI = rewrittenURL
+		if p.EnableDebug {
+			fmt.Println(r.URL.Path)
+		}
+
+		//Serve the file from the file system
+		fsHandler := http.FileServer(http.Dir(p.TargetDir))
+
+		// Replace {{csrf_token}} with the actual CSRF token and serve the file
+		p.populateCSRFToken(r, fsHandler).ServeHTTP(w, r)
+	})
+}
+
+// RegisterTerminateHandler registers the terminate handler for the PluginUiRouter
+// The terminate handler will be called when the plugin is terminated from Zoraxy plugin manager
+// if mux is nil, the handler will be registered to http.DefaultServeMux
+func (p *PluginUiDebugRouter) RegisterTerminateHandler(termFunc func(), mux *http.ServeMux) {
+	p.terminateHandler = termFunc
+	if mux == nil {
+		mux = http.DefaultServeMux
+	}
+	mux.HandleFunc(p.HandlerPrefix+"/term", func(w http.ResponseWriter, r *http.Request) {
+		p.terminateHandler()
+		w.WriteHeader(http.StatusOK)
+		go func() {
+			//Make sure the response is sent before the plugin is terminated
+			time.Sleep(100 * time.Millisecond)
+			os.Exit(0)
+		}()
+	})
+}
+
+// Attach the file system UI handler to the target http.ServeMux
+func (p *PluginUiDebugRouter) AttachHandlerToMux(mux *http.ServeMux) {
+	if mux == nil {
+		mux = http.DefaultServeMux
+	}
+
+	p.HandlerPrefix = strings.TrimSuffix(p.HandlerPrefix, "/")
+	mux.Handle(p.HandlerPrefix+"/", p.Handler())
+}

example/plugins/restful-example/mod/zoraxy_plugin/dynamic_router.go

@@ -0,0 +1,162 @@
+package zoraxy_plugin
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"strings"
+)
+
+/*
+
+	Dynamic Path Handler
+
+*/
+
+type SniffResult int
+
+const (
+	SniffResultAccpet SniffResult = iota // Forward the request to this plugin dynamic capture ingress
+	SniffResultSkip                      // Skip this plugin and let the next plugin handle the request
+)
+
+type SniffHandler func(*DynamicSniffForwardRequest) SniffResult
+
+/*
+RegisterDynamicSniffHandler registers a dynamic sniff handler for a path
+You can decide to accept or skip the request based on the request header and paths
+*/
+func (p *PathRouter) RegisterDynamicSniffHandler(sniff_ingress string, mux *http.ServeMux, handler SniffHandler) {
+	if !strings.HasSuffix(sniff_ingress, "/") {
+		sniff_ingress = sniff_ingress + "/"
+	}
+	mux.Handle(sniff_ingress, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if p.enableDebugPrint {
+			fmt.Println("Request captured by dynamic sniff path: " + r.RequestURI)
+		}
+
+		// Decode the request payload
+		jsonBytes, err := io.ReadAll(r.Body)
+		if err != nil {
+			if p.enableDebugPrint {
+				fmt.Println("Error reading request body:", err)
+			}
+			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
+			return
+		}
+		payload, err := DecodeForwardRequestPayload(jsonBytes)
+		if err != nil {
+			if p.enableDebugPrint {
+				fmt.Println("Error decoding request payload:", err)
+				fmt.Print("Payload: ")
+				fmt.Println(string(jsonBytes))
+			}
+			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
+			return
+		}
+
+		// Get the forwarded request UUID
+		forwardUUID := r.Header.Get("X-Zoraxy-RequestID")
+		payload.requestUUID = forwardUUID
+		payload.rawRequest = r
+
+		sniffResult := handler(&payload)
+		if sniffResult == SniffResultAccpet {
+			w.WriteHeader(http.StatusOK)
+			w.Write([]byte("OK"))
+		} else {
+			w.WriteHeader(http.StatusNotImplemented)
+			w.Write([]byte("SKIP"))
+		}
+	}))
+}
+
+// RegisterDynamicCaptureHandle register the dynamic capture ingress path with a handler
+func (p *PathRouter) RegisterDynamicCaptureHandle(capture_ingress string, mux *http.ServeMux, handlefunc func(http.ResponseWriter, *http.Request)) {
+	if !strings.HasSuffix(capture_ingress, "/") {
+		capture_ingress = capture_ingress + "/"
+	}
+	mux.Handle(capture_ingress, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if p.enableDebugPrint {
+			fmt.Println("Request captured by dynamic capture path: " + r.RequestURI)
+		}
+
+		rewrittenURL := r.RequestURI
+		rewrittenURL = strings.TrimPrefix(rewrittenURL, capture_ingress)
+		rewrittenURL = strings.ReplaceAll(rewrittenURL, "//", "/")
+		if rewrittenURL == "" {
+			rewrittenURL = "/"
+		}
+		if !strings.HasPrefix(rewrittenURL, "/") {
+			rewrittenURL = "/" + rewrittenURL
+		}
+		r.RequestURI = rewrittenURL
+
+		handlefunc(w, r)
+	}))
+}
+
+/*
+	Sniffing and forwarding
+
+	The following functions are here to help with
+	sniffing and forwarding requests to the dynamic
+	router.
+*/
+// A custom request object to be used in the dynamic sniffing
+type DynamicSniffForwardRequest struct {
+	Method     string              `json:"method"`
+	Hostname   string              `json:"hostname"`
+	URL        string              `json:"url"`
+	Header     map[string][]string `json:"header"`
+	RemoteAddr string              `json:"remote_addr"`
+	Host       string              `json:"host"`
+	RequestURI string              `json:"request_uri"`
+	Proto      string              `json:"proto"`
+	ProtoMajor int                 `json:"proto_major"`
+	ProtoMinor int                 `json:"proto_minor"`
+
+	/* Internal use */
+	rawRequest  *http.Request `json:"-"`
+	requestUUID string        `json:"-"`
+}
+
+// GetForwardRequestPayload returns a DynamicSniffForwardRequest object from an http.Request object
+func EncodeForwardRequestPayload(r *http.Request) DynamicSniffForwardRequest {
+	return DynamicSniffForwardRequest{
+		Method:     r.Method,
+		Hostname:   r.Host,
+		URL:        r.URL.String(),
+		Header:     r.Header,
+		RemoteAddr: r.RemoteAddr,
+		Host:       r.Host,
+		RequestURI: r.RequestURI,
+		Proto:      r.Proto,
+		ProtoMajor: r.ProtoMajor,
+		ProtoMinor: r.ProtoMinor,
+		rawRequest: r,
+	}
+}
+
+// DecodeForwardRequestPayload decodes JSON bytes into a DynamicSniffForwardRequest object
+func DecodeForwardRequestPayload(jsonBytes []byte) (DynamicSniffForwardRequest, error) {
+	var payload DynamicSniffForwardRequest
+	err := json.Unmarshal(jsonBytes, &payload)
+	if err != nil {
+		return DynamicSniffForwardRequest{}, err
+	}
+	return payload, nil
+}
+
+// GetRequest returns the original http.Request object, for debugging purposes
+func (dsfr *DynamicSniffForwardRequest) GetRequest() *http.Request {
+	return dsfr.rawRequest
+}
+
+// GetRequestUUID returns the request UUID
+// if this UUID is empty string, that might indicate the request
+// is not coming from the dynamic router
+func (dsfr *DynamicSniffForwardRequest) GetRequestUUID() string {
+	return dsfr.requestUUID
+}

example/plugins/restful-example/mod/zoraxy_plugin/embed_webserver.go

@@ -0,0 +1,174 @@
+package zoraxy_plugin
+
+import (
+	"embed"
+	"fmt"
+	"io/fs"
+	"net/http"
+	"net/url"
+	"os"
+	"strings"
+	"time"
+)
+
+type PluginUiRouter struct {
+	PluginID         string    //The ID of the plugin
+	TargetFs         *embed.FS //The embed.FS where the UI files are stored
+	TargetFsPrefix   string    //The prefix of the embed.FS where the UI files are stored, e.g. /web
+	HandlerPrefix    string    //The prefix of the handler used to route this router, e.g. /ui
+	EnableDebug      bool      //Enable debug mode
+	terminateHandler func()    //The handler to be called when the plugin is terminated
+}
+
+// NewPluginEmbedUIRouter creates a new PluginUiRouter with embed.FS
+// The targetFsPrefix is the prefix of the embed.FS where the UI files are stored
+// The targetFsPrefix should be relative to the root of the embed.FS
+// The targetFsPrefix should start with a slash (e.g. /web) that corresponds to the root folder of the embed.FS
+// The handlerPrefix is the prefix of the handler used to route this router
+// The handlerPrefix should start with a slash (e.g. /ui) that matches the http.Handle path
+// All prefix should not end with a slash
+func NewPluginEmbedUIRouter(pluginID string, targetFs *embed.FS, targetFsPrefix string, handlerPrefix string) *PluginUiRouter {
+	//Make sure all prefix are in /prefix format
+	if !strings.HasPrefix(targetFsPrefix, "/") {
+		targetFsPrefix = "/" + targetFsPrefix
+	}
+	targetFsPrefix = strings.TrimSuffix(targetFsPrefix, "/")
+
+	if !strings.HasPrefix(handlerPrefix, "/") {
+		handlerPrefix = "/" + handlerPrefix
+	}
+	handlerPrefix = strings.TrimSuffix(handlerPrefix, "/")
+
+	//Return the PluginUiRouter
+	return &PluginUiRouter{
+		PluginID:       pluginID,
+		TargetFs:       targetFs,
+		TargetFsPrefix: targetFsPrefix,
+		HandlerPrefix:  handlerPrefix,
+	}
+}
+
+func (p *PluginUiRouter) populateCSRFToken(r *http.Request, fsHandler http.Handler) http.Handler {
+	//Get the CSRF token from header
+	csrfToken := r.Header.Get("X-Zoraxy-Csrf")
+	if csrfToken == "" {
+		csrfToken = "missing-csrf-token"
+	}
+
+	//Return the middleware
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// Check if the request is for an HTML file
+		if strings.HasSuffix(r.URL.Path, ".html") {
+			//Read the target file from embed.FS
+			targetFilePath := strings.TrimPrefix(r.URL.Path, "/")
+			targetFilePath = p.TargetFsPrefix + "/" + targetFilePath
+			targetFilePath = strings.TrimPrefix(targetFilePath, "/")
+			targetFileContent, err := fs.ReadFile(*p.TargetFs, targetFilePath)
+			if err != nil {
+				http.Error(w, "File not found", http.StatusNotFound)
+				return
+			}
+			body := string(targetFileContent)
+			body = strings.ReplaceAll(body, "{{.csrfToken}}", csrfToken)
+			w.Header().Set("Content-Type", "text/html")
+			w.WriteHeader(http.StatusOK)
+			w.Write([]byte(body))
+			return
+		} else if strings.HasSuffix(r.URL.Path, "/") {
+			// Check if the directory has an index.html file
+			indexFilePath := strings.TrimPrefix(r.URL.Path, "/") + "index.html"
+			indexFilePath = p.TargetFsPrefix + "/" + indexFilePath
+			indexFilePath = strings.TrimPrefix(indexFilePath, "/")
+			indexFileContent, err := fs.ReadFile(*p.TargetFs, indexFilePath)
+			if err == nil {
+				body := string(indexFileContent)
+				body = strings.ReplaceAll(body, "{{.csrfToken}}", csrfToken)
+				w.Header().Set("Content-Type", "text/html")
+				w.WriteHeader(http.StatusOK)
+				w.Write([]byte(body))
+				return
+			}
+		}
+
+		//Call the next handler
+		fsHandler.ServeHTTP(w, r)
+	})
+
+}
+
+// GetHttpHandler returns the http.Handler for the PluginUiRouter
+func (p *PluginUiRouter) Handler() http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		//Remove the plugin UI handler path prefix
+		if p.EnableDebug {
+			fmt.Print("Request URL:", r.URL.Path, " rewriting to ")
+		}
+
+		rewrittenURL := r.RequestURI
+		rewrittenURL = strings.TrimPrefix(rewrittenURL, p.HandlerPrefix)
+		rewrittenURL = strings.ReplaceAll(rewrittenURL, "//", "/")
+		r.URL, _ = url.Parse(rewrittenURL)
+		r.RequestURI = rewrittenURL
+		if p.EnableDebug {
+			fmt.Println(r.URL.Path)
+		}
+
+		//Serve the file from the embed.FS
+		subFS, err := fs.Sub(*p.TargetFs, strings.TrimPrefix(p.TargetFsPrefix, "/"))
+		if err != nil {
+			fmt.Println(err.Error())
+			http.Error(w, "Internal Server Error", http.StatusInternalServerError)
+			return
+		}
+
+		// Replace {{csrf_token}} with the actual CSRF token and serve the file
+		p.populateCSRFToken(r, http.FileServer(http.FS(subFS))).ServeHTTP(w, r)
+	})
+}
+
+// RegisterTerminateHandler registers the terminate handler for the PluginUiRouter
+// The terminate handler will be called when the plugin is terminated from Zoraxy plugin manager
+// if mux is nil, the handler will be registered to http.DefaultServeMux
+func (p *PluginUiRouter) RegisterTerminateHandler(termFunc func(), mux *http.ServeMux) {
+	p.terminateHandler = termFunc
+	if mux == nil {
+		mux = http.DefaultServeMux
+	}
+	mux.HandleFunc(p.HandlerPrefix+"/term", func(w http.ResponseWriter, r *http.Request) {
+		p.terminateHandler()
+		w.WriteHeader(http.StatusOK)
+		go func() {
+			//Make sure the response is sent before the plugin is terminated
+			time.Sleep(100 * time.Millisecond)
+			os.Exit(0)
+		}()
+	})
+}
+
+// HandleFunc registers a handler function for the given pattern
+// The pattern should start with the handler prefix, e.g. /ui/hello
+// If the pattern does not start with the handler prefix, it will be prepended with the handler prefix
+func (p *PluginUiRouter) HandleFunc(pattern string, handler func(http.ResponseWriter, *http.Request), mux *http.ServeMux) {
+	// If mux is nil, use the default ServeMux
+	if mux == nil {
+		mux = http.DefaultServeMux
+	}
+
+	// Make sure the pattern starts with the handler prefix
+	if !strings.HasPrefix(pattern, p.HandlerPrefix) {
+		pattern = p.HandlerPrefix + pattern
+	}
+
+	// Register the handler with the http.ServeMux
+	mux.HandleFunc(pattern, handler)
+}
+
+// Attach the embed UI handler to the target http.ServeMux
+func (p *PluginUiRouter) AttachHandlerToMux(mux *http.ServeMux) {
+	if mux == nil {
+		mux = http.DefaultServeMux
+	}
+
+	p.HandlerPrefix = strings.TrimSuffix(p.HandlerPrefix, "/")
+	mux.Handle(p.HandlerPrefix+"/", p.Handler())
+}

example/plugins/restful-example/mod/zoraxy_plugin/static_router.go

@@ -0,0 +1,105 @@
+package zoraxy_plugin
+
+import (
+	"fmt"
+	"net/http"
+	"sort"
+	"strings"
+)
+
+type PathRouter struct {
+	enableDebugPrint bool
+	pathHandlers     map[string]http.Handler
+	defaultHandler   http.Handler
+}
+
+// NewPathRouter creates a new PathRouter
+func NewPathRouter() *PathRouter {
+	return &PathRouter{
+		enableDebugPrint: false,
+		pathHandlers:     make(map[string]http.Handler),
+	}
+}
+
+// RegisterPathHandler registers a handler for a path
+func (p *PathRouter) RegisterPathHandler(path string, handler http.Handler) {
+	path = strings.TrimSuffix(path, "/")
+	p.pathHandlers[path] = handler
+}
+
+// RemovePathHandler removes a handler for a path
+func (p *PathRouter) RemovePathHandler(path string) {
+	delete(p.pathHandlers, path)
+}
+
+// SetDefaultHandler sets the default handler for the router
+// This handler will be called if no path handler is found
+func (p *PathRouter) SetDefaultHandler(handler http.Handler) {
+	p.defaultHandler = handler
+}
+
+// SetDebugPrintMode sets the debug print mode
+func (p *PathRouter) SetDebugPrintMode(enable bool) {
+	p.enableDebugPrint = enable
+}
+
+// StartStaticCapture starts the static capture ingress
+func (p *PathRouter) RegisterStaticCaptureHandle(capture_ingress string, mux *http.ServeMux) {
+	if !strings.HasSuffix(capture_ingress, "/") {
+		capture_ingress = capture_ingress + "/"
+	}
+	mux.Handle(capture_ingress, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		p.staticCaptureServeHTTP(w, r)
+	}))
+}
+
+// staticCaptureServeHTTP serves the static capture path using user defined handler
+func (p *PathRouter) staticCaptureServeHTTP(w http.ResponseWriter, r *http.Request) {
+	capturePath := r.Header.Get("X-Zoraxy-Capture")
+	if capturePath != "" {
+		if p.enableDebugPrint {
+			fmt.Printf("Using capture path: %s\n", capturePath)
+		}
+		originalURI := r.Header.Get("X-Zoraxy-Uri")
+		r.URL.Path = originalURI
+		if handler, ok := p.pathHandlers[capturePath]; ok {
+			handler.ServeHTTP(w, r)
+			return
+		}
+	}
+	p.defaultHandler.ServeHTTP(w, r)
+}
+
+func (p *PathRouter) PrintRequestDebugMessage(r *http.Request) {
+	if p.enableDebugPrint {
+		fmt.Printf("Capture Request with path: %s \n\n**Request Headers** \n\n", r.URL.Path)
+		keys := make([]string, 0, len(r.Header))
+		for key := range r.Header {
+			keys = append(keys, key)
+		}
+		sort.Strings(keys)
+		for _, key := range keys {
+			for _, value := range r.Header[key] {
+				fmt.Printf("%s: %s\n", key, value)
+			}
+		}
+
+		fmt.Printf("\n\n**Request Details**\n\n")
+		fmt.Printf("Method: %s\n", r.Method)
+		fmt.Printf("URL: %s\n", r.URL.String())
+		fmt.Printf("Proto: %s\n", r.Proto)
+		fmt.Printf("Host: %s\n", r.Host)
+		fmt.Printf("RemoteAddr: %s\n", r.RemoteAddr)
+		fmt.Printf("RequestURI: %s\n", r.RequestURI)
+		fmt.Printf("ContentLength: %d\n", r.ContentLength)
+		fmt.Printf("TransferEncoding: %v\n", r.TransferEncoding)
+		fmt.Printf("Close: %v\n", r.Close)
+		fmt.Printf("Form: %v\n", r.Form)
+		fmt.Printf("PostForm: %v\n", r.PostForm)
+		fmt.Printf("MultipartForm: %v\n", r.MultipartForm)
+		fmt.Printf("Trailer: %v\n", r.Trailer)
+		fmt.Printf("RemoteAddr: %s\n", r.RemoteAddr)
+		fmt.Printf("RequestURI: %s\n", r.RequestURI)
+
+	}
+}

example/plugins/restful-example/mod/zoraxy_plugin/zoraxy_plugin.go

@@ -0,0 +1,176 @@
+package zoraxy_plugin
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"strings"
+)
+
+/*
+	Plugins Includes.go
+
+	This file is copied from Zoraxy source code
+	You can always find the latest version under mod/plugins/includes.go
+	Usually this file are backward compatible
+*/
+
+type PluginType int
+
+const (
+	PluginType_Router    PluginType = 0 //Router Plugin, used for handling / routing / forwarding traffic
+	PluginType_Utilities PluginType = 1 //Utilities Plugin, used for utilities like Zerotier or Static Web Server that do not require interception with the dpcore
+)
+
+type StaticCaptureRule struct {
+	CapturePath string `json:"capture_path"`
+	//To be expanded
+}
+
+type ControlStatusCode int
+
+const (
+	ControlStatusCode_CAPTURED  ControlStatusCode = 280 //Traffic captured by plugin, ask Zoraxy not to process the traffic
+	ControlStatusCode_UNHANDLED ControlStatusCode = 284 //Traffic not handled by plugin, ask Zoraxy to process the traffic
+	ControlStatusCode_ERROR     ControlStatusCode = 580 //Error occurred while processing the traffic, ask Zoraxy to process the traffic and log the error
+)
+
+type SubscriptionEvent struct {
+	EventName   string `json:"event_name"`
+	EventSource string `json:"event_source"`
+	Payload     string `json:"payload"` //Payload of the event, can be empty
+}
+
+type RuntimeConstantValue struct {
+	ZoraxyVersion    string `json:"zoraxy_version"`
+	ZoraxyUUID       string `json:"zoraxy_uuid"`
+	DevelopmentBuild bool   `json:"development_build"` //Whether the Zoraxy is a development build or not
+}
+
+/*
+IntroSpect Payload
+
+When the plugin is initialized with -introspect flag,
+the plugin shell return this payload as JSON and exit
+*/
+type IntroSpect struct {
+	/* Plugin metadata */
+	ID            string     `json:"id"`             //Unique ID of your plugin, recommended using your own domain in reverse like com.yourdomain.pluginname
+	Name          string     `json:"name"`           //Name of your plugin
+	Author        string     `json:"author"`         //Author name of your plugin
+	AuthorContact string     `json:"author_contact"` //Author contact of your plugin, like email
+	Description   string     `json:"description"`    //Description of your plugin
+	URL           string     `json:"url"`            //URL of your plugin
+	Type          PluginType `json:"type"`           //Type of your plugin, Router(0) or Utilities(1)
+	VersionMajor  int        `json:"version_major"`  //Major version of your plugin
+	VersionMinor  int        `json:"version_minor"`  //Minor version of your plugin
+	VersionPatch  int        `json:"version_patch"`  //Patch version of your plugin
+
+	/*
+
+		Endpoint Settings
+
+	*/
+
+	/*
+		Static Capture Settings
+
+		Once plugin is enabled these rules always applies to the enabled HTTP Proxy rule
+		This is faster than dynamic capture, but less flexible
+	*/
+	StaticCapturePaths   []StaticCaptureRule `json:"static_capture_paths"`   //Static capture paths of your plugin, see Zoraxy documentation for more details
+	StaticCaptureIngress string              `json:"static_capture_ingress"` //Static capture ingress path of your plugin (e.g. /s_handler)
+
+	/*
+		Dynamic Capture Settings
+
+		Once plugin is enabled, these rules will be captured and forward to plugin sniff
+		if the plugin sniff returns 280, the traffic will be captured
+		otherwise, the traffic will be forwarded to the next plugin
+		This is slower than static capture, but more flexible
+	*/
+	DynamicCaptureSniff   string `json:"dynamic_capture_sniff"`   //Dynamic capture sniff path of your plugin (e.g. /d_sniff)
+	DynamicCaptureIngress string `json:"dynamic_capture_ingress"` //Dynamic capture ingress path of your plugin (e.g. /d_handler)
+
+	/* UI Path for your plugin */
+	UIPath string `json:"ui_path"` //UI path of your plugin (e.g. /ui), will proxy the whole subpath tree to Zoraxy Web UI as plugin UI
+
+	/* Subscriptions Settings */
+	SubscriptionPath    string            `json:"subscription_path"`    //Subscription event path of your plugin (e.g. /notifyme), a POST request with SubscriptionEvent as body will be sent to this path when the event is triggered
+	SubscriptionsEvents map[string]string `json:"subscriptions_events"` //Subscriptions events of your plugin, see Zoraxy documentation for more details
+}
+
+/*
+ServeIntroSpect Function
+
+This function will check if the plugin is initialized with -introspect flag,
+if so, it will print the intro spect and exit
+
+Place this function at the beginning of your plugin main function
+*/
+func ServeIntroSpect(pluginSpect *IntroSpect) {
+	if len(os.Args) > 1 && os.Args[1] == "-introspect" {
+		//Print the intro spect and exit
+		jsonData, _ := json.MarshalIndent(pluginSpect, "", " ")
+		fmt.Println(string(jsonData))
+		os.Exit(0)
+	}
+}
+
+/*
+ConfigureSpec Payload
+
+Zoraxy will start your plugin with -configure flag,
+the plugin shell read this payload as JSON and configure itself
+by the supplied values like starting a web server at given port
+that listens to 127.0.0.1:port
+*/
+type ConfigureSpec struct {
+	Port         int                  `json:"port"`          //Port to listen
+	RuntimeConst RuntimeConstantValue `json:"runtime_const"` //Runtime constant values
+	//To be expanded
+}
+
+/*
+RecvExecuteConfigureSpec Function
+
+This function will read the configure spec from Zoraxy
+and return the ConfigureSpec object
+
+Place this function after ServeIntroSpect function in your plugin main function
+*/
+func RecvConfigureSpec() (*ConfigureSpec, error) {
+	for i, arg := range os.Args {
+		if strings.HasPrefix(arg, "-configure=") {
+			var configSpec ConfigureSpec
+			if err := json.Unmarshal([]byte(arg[11:]), &configSpec); err != nil {
+				return nil, err
+			}
+			return &configSpec, nil
+		} else if arg == "-configure" {
+			var configSpec ConfigureSpec
+			var nextArg string
+			if len(os.Args) > i+1 {
+				nextArg = os.Args[i+1]
+				if err := json.Unmarshal([]byte(nextArg), &configSpec); err != nil {
+					return nil, err
+				}
+			} else {
+				return nil, fmt.Errorf("No port specified after -configure flag")
+			}
+			return &configSpec, nil
+		}
+	}
+	return nil, fmt.Errorf("No -configure flag found")
+}
+
+/*
+ServeAndRecvSpec Function
+
+This function will serve the intro spect and return the configure spec
+See the ServeIntroSpect and RecvConfigureSpec for more details
+*/
+func ServeAndRecvSpec(pluginSpect *IntroSpect) (*ConfigureSpec, error) {
+	ServeIntroSpect(pluginSpect)
+	return RecvConfigureSpec()
+}