324 lines
11 KiB
Go
324 lines
11 KiB
Go
/*
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Jilo Agent
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Description: Remote agent for Jilo Web with http API
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Author: Yasen Pramatarov
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License: GPLv2
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Project URL: https://lindeas.com/jilo
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Year: 2024
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Version: 0.1
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*/
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package main
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import (
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"fmt"
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"encoding/json"
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"gopkg.in/yaml.v2"
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"github.com/dgrijalva/jwt-go"
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"io/ioutil"
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"log"
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"net/http"
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"os"
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"os/exec"
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"strconv"
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"strings"
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)
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// Config holds the structure of the configuration file
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type Config struct {
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AgentPort int `yaml:"agent_port"`
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SecretKey string `yaml:"secret_key"`
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NginxPort int `yaml:"nginx_port"`
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ProsodyPort int `yaml:"prosody_port"`
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JicofoStatsURL string `yaml:"jicofo_stats_url"`
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JVBStatsURL string `yaml:"jvb_stats_url"`
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JibriHealthURL string `yaml:"jibri_health_url"`
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}
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// Claims holds JWT access right
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type Claims struct {
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Username string `json:"sub"`
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Role string `json:"role"`
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jwt.StandardClaims
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}
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// NginxData holds the nginx data structure for the API response to /nginx
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type NginxData struct {
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NginxState string `json:"nginx_state"`
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NginxConnections int `json:"nginx_connections"`
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}
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// ProsodyData holds the prosody data structure for the API response to /prosody
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type ProsodyData struct {
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ProsodyState string `json:"prosody_state"`
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ProsodyConnections int `json:"prosody_connections"`
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}
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// JicofoData holds the Jicofo data structure for the API response to /jicofo
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type JicofoData struct {
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JicofoState string `json:"jicofo_state"`
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JicofoAPIData map[string]interface{} `json:"jicofo_api_data"`
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}
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// JVBData holds the JVB data structure for the API response to /jvb
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type JVBData struct {
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JVBState string `json:"jvb_state"`
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JVBAPIData map[string]interface{} `json:"jvb_api_data"`
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}
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// JibriData holds the Jibri data structure for the API response to /jibri
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type JibriData struct {
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JibriState string `json:"jibri_state"`
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JibriHealthData map[string]interface{} `json:"jibri_health_data"`
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}
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var secretKey []byte
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// getServiceState checks the status of the speciied service
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func getServiceState(service string) string {
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output, err := exec.Command("systemctl", "is-active", service).Output()
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if err != nil {
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log.Printf("Error checking the service \"%v\" state: %v", service, err)
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return "error"
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}
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state := strings.TrimSpace(string(output))
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if state == "active" {
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return "running"
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}
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return "not running"
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}
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// getServiceConnections gets the number of active connections to the specified port
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func getServiceConnections(service string, port int) int {
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cmd := fmt.Sprintf("netstat -an | grep ':%d' | wc -l", port)
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output, err := exec.Command("bash", "-c", cmd).Output()
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if err != nil {
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log.Printf("Error counting the \"%v\" connections: %v", service, err)
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return -1
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}
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connections := strings.TrimSpace(string(output))
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connectionsInt, err := strconv.Atoi(connections)
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if err != nil {
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log.Printf("Error converting connections to integer number: %v", err)
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return -1
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}
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return connectionsInt
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}
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// getJitsiAPIData gets the response from the specified Jitsi stats API
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func getJitsiAPIData(service string, url string) map[string]interface{} {
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cmd := fmt.Sprintf("curl -s %v", url)
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output, err := exec.Command("bash", "-c", cmd).Output()
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if err != nil {
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log.Printf("Error getting the \"%v\" API stats: %v", service, err)
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return map[string]interface{}{"error": "failed to get the Jitsi API stats"}
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}
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var result map[string]interface{}
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if err := json.Unmarshal(output, &result); err != nil {
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log.Printf("Error in parsing the JSON: %v", err)
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return map[string]interface{}{"error": "invalid JSON format"}
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}
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return result
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}
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// loadConfig loads the configuration from a YAML config file
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func loadConfig(filename string) (Config) {
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// default config values
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config := Config {
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AgentPort: 8081, // default Agent port (we avoid 80, 443, 8080 and 8888)
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NginxPort: 80, // default nginx port
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ProsodyPort: 5222, // default prosody port
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JicofoStatsURL: "http://localhost:8888/stats", // default Jicofo stats URL
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JVBStatsURL: "http://localhost:8080/colibri/stats", // default JVB stats URL
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JibriHealthURL: "http://localhost:2222/jibri/api/v1.0/health", // default Jibri health URL
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}
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// we try to load the config file; use default values otherwise
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file, err := os.Open(filename)
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if err != nil {
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log.Printf("Can't open the config file \"%v\". Using default values.", filename)
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return config
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}
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defer file.Close()
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bytes, err := ioutil.ReadAll(file)
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if err != nil {
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log.Printf("There was an error reading the config file. Using default values")
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return config
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}
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if err := yaml.Unmarshal(bytes, &config); err != nil {
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log.Printf("Error parsing the config file. Using default values.")
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}
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return config
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}
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// authenticationJWT handles the JWT auth
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func authenticationJWT(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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tokenString := r.Header.Get("Authorization")
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// DEBUG print the token for debugging (only for debug, remove in prod)
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//log.Println("Received token:", tokenString)
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// empty auth header
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if tokenString == "" {
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log.Println("No Authorization header received")
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http.Error(w, "Auth header not received", http.StatusUnauthorized)
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return
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}
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// remove "Bearer "
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if len(tokenString) > 7 && tokenString[:7] == "Bearer " {
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tokenString = tokenString[7:]
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} else {
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log.Println("Bearer token missing")
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http.Error(w, "Malformed Authorization header", http.StatusUnauthorized)
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return
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}
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// DEBUG print out the token for debugging (remove in production!)
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//log.Printf("Received JWT: %s", tokenString)
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claims := &Claims{}
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token, err := jwt.ParseWithClaims(tokenString, claims, func(token *jwt.Token) (interface{}, error) {
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// DEBUG log secret key for debugging (remove from production!)
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//log.Printf("Parsing JWT with secret key: %s", secretKey)
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return secretKey, nil
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})
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// JWT errors and error logging
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if err != nil {
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// log the error message for debugging (not in prod!)
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log.Printf("JWT parse error: %v", err)
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if err == jwt.ErrSignatureInvalid {
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http.Error(w, "Invalid JWT signature", http.StatusUnauthorized)
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return
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}
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http.Error(w, "Error parsing JWT: "+err.Error(), http.StatusUnauthorized)
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return
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}
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// JWT invalid
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if !token.Valid {
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log.Println("Invalid JWT token")
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http.Error(w, "Invalid JWT token", http.StatusUnauthorized)
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return
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}
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next.ServeHTTP(w, r)
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})
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}
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// nginxHandler handles the /nginx endpoint
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func nginxHandler(config Config, w http.ResponseWriter, r *http.Request) {
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data := NginxData {
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NginxState: getServiceState("nginx"),
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NginxConnections: getServiceConnections("nginx", config.NginxPort),
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}
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(data)
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}
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// prosodyHandler handles the /prosody endpoint
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func prosodyHandler(config Config, w http.ResponseWriter, r *http.Request) {
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data := ProsodyData {
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ProsodyState: getServiceState("prosody"),
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ProsodyConnections: getServiceConnections("prosody", config.ProsodyPort),
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}
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(data)
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}
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// jicofoHandler handles the /jicofo endpoint
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func jicofoHandler(config Config, w http.ResponseWriter, r *http.Request) {
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data := JicofoData {
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JicofoState: getServiceState("jicofo"),
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JicofoAPIData: getJitsiAPIData("jicofo", config.JicofoStatsURL),
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}
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(data)
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}
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// jvbHandler handles the /jvb endpoint
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func jvbHandler(config Config, w http.ResponseWriter, r *http.Request) {
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data := JVBData {
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JVBState: getServiceState("jitsi-videobridge2"),
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JVBAPIData: getJitsiAPIData("jitsi-videobridge2", config.JVBStatsURL),
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}
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(data)
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}
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// jibriHandler handles the /jibri endpoint
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func jibriHandler(config Config, w http.ResponseWriter, r *http.Request) {
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data := JibriData {
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JibriState: getServiceState("jibri"),
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JibriHealthData: getJitsiAPIData("jibri", config.JibriHealthURL),
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}
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w.Header().Set("Content-Type", "application/json")
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json.NewEncoder(w).Encode(data)
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}
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// CORS Middleware to handle CORS for all endpoints
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func corsMiddleware(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// Set CORS headers
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w.Header().Set("Access-Control-Allow-Origin", "*") // Allow all origins or restrict to specific domain
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w.Header().Set("Access-Control-Allow-Methods", "GET, POST, OPTIONS")
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w.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization")
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// Handle preflight (OPTIONS) request
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if r.Method == http.MethodOptions {
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w.WriteHeader(http.StatusNoContent) // Respond with 204 No Content for preflight
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return
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}
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// Pass the request to the next handler
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next.ServeHTTP(w, r)
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})
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}
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// main sets up the http server and the routes
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func main() {
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// load the configuration
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config := loadConfig("jilo-agent.conf")
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secretKey = []byte(config.SecretKey)
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mux := http.NewServeMux()
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// endpoints
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mux.Handle("/nginx", authenticationJWT(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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nginxHandler(config, w, r)
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})))
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mux.Handle("/prosody", authenticationJWT(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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prosodyHandler(config, w, r)
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})))
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mux.Handle("/jicofo", authenticationJWT(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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jicofoHandler(config, w, r)
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})))
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mux.Handle("/jvb", authenticationJWT(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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jvbHandler(config, w, r)
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})))
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mux.Handle("/jibri", authenticationJWT(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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jibriHandler(config, w, r)
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})))
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// add the CORS headers to the mux
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corsHandler := corsMiddleware(mux)
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// start the http server
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agentPortStr := fmt.Sprintf(":%d", config.AgentPort)
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fmt.Printf("Starting Jilo agent on port %d.\n", config.AgentPort)
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if err := http.ListenAndServe(agentPortStr, corsHandler); err != nil {
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log.Fatalf("Could not start the agent: %v\n", err)
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}
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}
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