frontend: refactor and dispatch in many routes

frontend/chname.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"log"
+	"net/http"
+	"strings"
+)
+
+type ChNameHandler struct {}
+
+func (n ChNameHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	log.Printf("Handling %s name change request from %s: %s [%s]\n", r.Method, r.RemoteAddr, r.URL.Path, r.UserAgent())
+
+	w.Header().Set("Content-Type", "application/json")
+
+	// Check request type and size
+	if r.Method != "POST" {
+		http.Error(w, "{\"errmsg\":\"Requête invalide.\"}", http.StatusBadRequest)
+		return
+	} else if r.ContentLength < 0 || r.ContentLength > 1023 {
+		http.Error(w, "{\"errmsg\":\"Requête trop longue ou de taille inconnue\"}", http.StatusRequestEntityTooLarge)
+		return
+	}
+
+	// Extract URL arguments
+	var sURL = strings.Split(r.URL.Path, "/")
+
+	if len(sURL) != 1 {
+		http.Error(w, "{\"errmsg\":\"Requête invalide.\"}", http.StatusBadRequest)
+		return
+	}
+
+	team := sURL[0]
+
+	// Enqueue file for backend treatment
+	if saveTeamFile(SubmissionDir, team, "name", w, r) {
+		http.Error(w, "{\"errmsg\":\"Demande de changement de nom acceptée\"}", http.StatusAccepted)
+	}
+}

frontend/main.go

@@ -73,7 +73,13 @@ func main() {
 	if *resolutionRoute {
 		http.Handle(fmt.Sprintf("%s/resolution/", *prefix), http.StripPrefix(fmt.Sprintf("%s/resolution/", *prefix), ResolutionHandler{}))
 	}
-	http.Handle(fmt.Sprintf("%s/", *prefix), http.StripPrefix(*prefix, SubmissionHandler{end, *denyChName, *allowRegistration}))
+	if *allowRegistration {
+		http.Handle(fmt.Sprintf("%s/registration", *prefix), http.StripPrefix(fmt.Sprintf("%s/registration", *prefix), RegistrationHandler{}))
+	}
+	if !*denyChName {
+		http.Handle(fmt.Sprintf("%s/chname/", *prefix), http.StripPrefix(fmt.Sprintf("%s/chname/", *prefix), ChNameHandler{}))
+	}
+	http.Handle(fmt.Sprintf("%s/submission/", *prefix), http.StripPrefix(fmt.Sprintf("%s/submission/", *prefix), SubmissionHandler{end}))
 
 	log.Println(fmt.Sprintf("Ready, listening on %s", *bind))
 	if err := http.ListenAndServe(*bind, nil); err != nil {

frontend/register.go

@@ -0,0 +1,33 @@
+package main
+
+import (
+	"log"
+	"net/http"
+	"path"
+)
+
+type RegistrationHandler struct {}
+
+func (e RegistrationHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
+	log.Printf("Handling %s registration request from %s: %s [%s]\n", r.Method, r.RemoteAddr, r.URL.Path, r.UserAgent())
+
+	w.Header().Set("Content-Type", "application/json")
+
+	// Check request type and size
+	if r.Method != "POST" {
+		http.Error(w, "{\"errmsg\":\"Requête invalide.\"}", http.StatusBadRequest)
+		return
+	} else if r.ContentLength < 0 || r.ContentLength > 1023 {
+		http.Error(w, "{\"errmsg\":\"Requête trop longue ou de taille inconnue\"}", http.StatusRequestEntityTooLarge)
+		return
+	}
+
+	// Enqueue file for backend treatment
+	if err := saveFile(path.Join(SubmissionDir, "_registration"), "", r); err != nil {
+		log.Println("Unable to open registration file:", err)
+		http.Error(w, "{\"errmsg\":\"Internal server error. Please retry in few seconds.\"}", http.StatusInternalServerError)
+		return
+	}
+
+	http.Error(w, "{\"errmsg\":\"Demande d'enregistrement acceptée\"}", http.StatusAccepted)
+}

frontend/save.go

@@ -0,0 +1,81 @@
+package main
+
+import (
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+	"path"
+)
+
+func saveTeamFile(dirname string, team string, filename string, w http.ResponseWriter, r *http.Request) bool {
+	if _, err := os.Stat(path.Join(dirname, team)); os.IsNotExist(err) || len(team) < 1 || team[0] == '_' {
+		http.Error(w, "{\"errmsg\":\"Requête invalide.\"}", http.StatusBadRequest)
+		return false
+	} else {
+		if len(filename) <= 0 {
+			log.Println("EMPTY $EXERCICE RECEIVED:", filename)
+			http.Error(w, "{\"errmsg\":\"Internal server error. Please retry in few seconds.\"}", http.StatusInternalServerError)
+			return false
+		}
+
+		// Previous submission not treated
+		if _, err := os.Stat(path.Join(SubmissionDir, team, filename)); !os.IsNotExist(err) {
+			http.Error(w, "{\"errmsg\":\"Du calme ! une requête est déjà en cours de traitement.\"}", http.StatusPaymentRequired)
+			return false
+		}
+
+		if err := saveFile(path.Join(SubmissionDir, team), filename, r); err != nil {
+			log.Println("Unable to handle submission file:", err)
+			http.Error(w, "{\"errmsg\":\"Internal server error. Please retry in few seconds.\"}", http.StatusInternalServerError)
+			return false
+		}
+
+		return true
+	}
+}
+
+func saveFile(dirname string, filename string, r *http.Request) error {
+	if _, err := os.Stat(dirname); os.IsNotExist(err) {
+		if err := os.MkdirAll(dirname, 0777); err != nil {
+			return err
+		}
+	}
+
+	var f *os.File
+
+	if filename == "" {
+		if fd, err := ioutil.TempFile(dirname, ""); err != nil {
+			return err
+		} else {
+			defer f.Close()
+			f = fd
+		}
+	} else {
+		if fd, err := os.Create(path.Join(dirname, filename)); err != nil {
+			return err
+		} else {
+			defer f.Close()
+			f = fd
+		}
+	}
+
+	// Read request body
+	var body []byte
+	if r.ContentLength > 0 {
+		tmp := make([]byte, 1024)
+		for {
+			n, err := r.Body.Read(tmp)
+			for j := 0; j < n; j++ {
+				body = append(body, tmp[j])
+			}
+			if err != nil || n <= 0 {
+				break
+			}
+		}
+	}
+
+	f.Write(body)
+
+	return nil
+}

frontend/submit.go

@@ -2,11 +2,8 @@ package main
 
 import (
 	"fmt"
-	"io/ioutil"
 	"log"
 	"net/http"
-	"os"
-	"path"
 	"strconv"
 	"strings"
 	"time"
@@ -14,8 +11,6 @@ import (
 
 type SubmissionHandler struct {
 	ChallengeEnd      time.Time
-	DenyChName        bool
-	AllowRegistration bool
 }
 
 func (s SubmissionHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
@@ -35,113 +30,25 @@ func (s SubmissionHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	// Extract URL arguments
 	var sURL = strings.Split(r.URL.Path, "/")
 
-	if len(sURL) == 2 && s.AllowRegistration && sURL[1] == "registration" {
+	if len(sURL) != 2 {
-		if _, err := os.Stat(path.Join(SubmissionDir, "_registration")); os.IsNotExist(err) {
+		http.Error(w, "{\"errmsg\":\"Arguments manquants.\"}", http.StatusBadRequest)
-			log.Println("Creating _registration directory")
-			if err := os.MkdirAll(path.Join(SubmissionDir, "_registration"), 0777); err != nil {
-				log.Println("Unable to create _registration directory: ", err)
-				http.Error(w, "{\"errmsg\":\"Internal server error. Please retry in few seconds.\"}", http.StatusInternalServerError)
-				return
-			}
-		}
-
-		if f, err := ioutil.TempFile(path.Join(SubmissionDir, "_registration"), ""); err != nil {
-			log.Println("Unable to open registration file:", err)
-			http.Error(w, "{\"errmsg\":\"Internal server error. Please retry in few seconds..\"}", http.StatusInternalServerError)
-		} else {
-			// Read request body
-			var body []byte
-			if r.ContentLength > 0 {
-				tmp := make([]byte, 1024)
-				for {
-					n, err := r.Body.Read(tmp)
-					for j := 0; j < n; j++ {
-						body = append(body, tmp[j])
-					}
-					if err != nil || n <= 0 {
-						break
-					}
-				}
-			}
-
-			f.Write(body)
-			f.Close()
-		}
-
-		http.Error(w, "{\"errmsg\":\"Demande d'enregistrement acceptée\"}", http.StatusAccepted)
-		return
-	} else if len(sURL) != 3 {
-		http.Error(w, "{\"errmsg\":\"Requête invalide.\"}", http.StatusBadRequest)
 		return
 	}
+	team := sURL[0]
 
 	if time.Now().Sub(s.ChallengeEnd) > 0 {
 		http.Error(w, "{\"errmsg\":\"Vous ne pouvez plus soumettre, le challenge est terminé.\"}", http.StatusForbidden)
 		return
 	}
 
-	// Parse arguments
+	if pex, err := strconv.Atoi(sURL[1]); err != nil {
-	if _, err := os.Stat(path.Join(TeamsDir, sURL[1])); os.IsNotExist(err) || len(sURL[1]) < 1 || sURL[1][0] == '_' {
-		http.Error(w, "{\"errmsg\":\"Requête invalide.\"}", http.StatusBadRequest)
-		return
-	} else if pex, err := strconv.Atoi(sURL[2]); (s.DenyChName || sURL[2] != "name") && err != nil {
 		http.Error(w, "{\"errmsg\":\"Requête invalide.\"}", http.StatusBadRequest)
 		return
 	} else {
-		team := sURL[1]
+		exercice := fmt.Sprintf("%d", pex)
 
-		var exercice string
+		if saveTeamFile(TeamsDir, team, exercice, w, r) {
-		if sURL[2] == "name" {
-			exercice = sURL[2]
-		} else {
-			exercice = fmt.Sprintf("%d", pex)
-		}
-
-		if len(exercice) <= 0 {
-			log.Println("EMPTY $EXERCICE RECEIVED:", exercice)
-			http.Error(w, "{\"errmsg\":\"Internal server error. Please retry in few seconds.\"}", http.StatusInternalServerError)
-			return
-		}
-
-		if _, err := os.Stat(path.Join(SubmissionDir, team)); os.IsNotExist(err) {
-			log.Println("Creating submission directory for", team)
-			if err := os.MkdirAll(path.Join(SubmissionDir, team), 0777); err != nil {
-				log.Println("Unable to create submission directory: ", err)
-				http.Error(w, "{\"errmsg\":\"Internal server error. Please retry in few seconds.\"}", http.StatusInternalServerError)
-				return
-			}
-		}
-
-		// Previous submission not treated
-		if _, err := os.Stat(path.Join(SubmissionDir, team, exercice)); !os.IsNotExist(err) {
-			http.Error(w, "{\"errmsg\":\"Du calme ! une requête est déjà en cours de traitement.\"}", http.StatusPaymentRequired)
-			return
-		}
-
-		// Read request body
-		var body []byte
-		if r.ContentLength > 0 {
-			tmp := make([]byte, 1024)
-			for {
-				n, err := r.Body.Read(tmp)
-				for j := 0; j < n; j++ {
-					body = append(body, tmp[j])
-				}
-				if err != nil || n <= 0 {
-					break
-				}
-			}
-		}
-
-		// Store content in file
-		if file, err := os.Create(path.Join(SubmissionDir, team, exercice)); err != nil {
-			log.Println("Unable to open exercice file:", err)
-			http.Error(w, "{\"errmsg\":\"Internal server error. Please retry in few seconds.\"}", http.StatusInternalServerError)
-			return
-		} else {
-			file.Write(body)
-			file.Close()
-		}
 			http.Error(w, "{\"errmsg\":\"Son traitement est en cours...\"}", http.StatusAccepted)
 		}
+	}
 }