md5 hash used as authentication method

Author: kamilkabir9

.idea/workspace.xml

@@ -1,12 +1,11 @@
 package main
 
 import (
-	"encoding/base64"
 	"encoding/json"
 	"flag"
 	"fmt"
 	"github.com/dustin/go-humanize"
-	_ "github.com/kamilkabir9/LDrop/statik" // TODO: Replace with the absolute import path
+	_ "github.com/kamilkabir9/LDrop/statik" // NOTE: Replace with the absolute import path
 	"github.com/mdp/qrterminal"
 	"github.com/rakyll/statik/fs"
 	"github.com/skratchdot/open-golang/open"
@@ -22,6 +21,8 @@ import (
 	"strings"
 	"sync"
 	"time"
+	"crypto/md5"
+	"encoding/hex"
 )
 
 const (
@@ -146,19 +147,12 @@ var ignoreHiddenFilesFlag bool
 var verboseFlag bool
 var err error
 var secretFlag string
-
+var secretFlagMD5 string
 func checkSecret(secretEncoded string) bool {
-	fmt.Println("got:", secretEncoded)
-	secretByte, err := base64.URLEncoding.DecodeString(secretEncoded)
-	if err != nil {
-		log.Println(err)
-	}
-	secretRecvd := string(secretByte)
-	if secretRecvd == secretFlag {
-		fmt.Printf("Passed %v==%v", secretRecvd, secretFlag)
+	if secretEncoded== secretFlagMD5 {
 		return true
 	}
-	fmt.Printf("Failed %v=!%v !!!!!!", secretRecvd, secretFlag)
+	verbose(fmt.Sprintf("Secret Failed %v=!%v !!!!!!", secretEncoded, secretFlagMD5))
 	return false
 }
 func main() {
@@ -180,6 +174,9 @@ func main() {
 		verbose = func(s string) {
 		}
 	}
+	hasher := md5.New()
+	hasher.Write([]byte(secretFlag))
+	secretFlagMD5=hex.EncodeToString(hasher.Sum(nil))
 	uploadFolder, err = filepath.Abs(uploadFolder)
 	if err != nil {
 		log.Panicln(err)
@@ -190,11 +187,11 @@ func main() {
 	}
 	http.HandleFunc("/viewFile/", viewFileHandler)
 	http.Handle("/", http.FileServer(statikFS))
-	http.HandleFunc("/upload", upLoadHandler)
-	http.HandleFunc("/getLastFile", getLastFileHandler)
-	http.HandleFunc("/getAllFiles", getAllFilesHandler)
-	http.HandleFunc("/getFile/", getFileHandler)
-	http.HandleFunc("/downLoadFile/", serveThisFileHandler)
+	http.HandleFunc("/upload", upLoadHandler)               //api
+	http.HandleFunc("/getLastFile", getLastFileHandler)     //api
+	http.HandleFunc("/getAllFiles", getAllFilesHandler)     //api
+	http.HandleFunc("/getFile/", getFileHandler)            //api
+	http.HandleFunc("/downLoadFile/", serveThisFileHandler) //api
 
 	//Adapted from https://stackoverflow.com/questions/43424787/how-to-use-next-available-port-in-http-listenandserve
 	listener, err := net.Listen("tcp", ":0")
@@ -246,14 +243,18 @@ func UploadStatusJson(status string, desc string) string {
 func upLoadHandler(w http.ResponseWriter, r *http.Request) {
 
 	verbose(fmt.Sprintln("Downloading File....."))
-
 	file, fileHeader, err := r.FormFile("fileUpload")
 	if err != nil {
 		log.Println(err)
 		result := UploadStatusJson(FailedStatus, fmt.Sprint(err))
 		fmt.Fprint(w, result)
 		return
 	}
+	if !checkSecret(r.Header.Get("secret")) {
+		result := UploadStatusJson(FailedStatus, fmt.Sprintf("Error Uploading file %v. Secret mismatch !!!", fileHeader.Filename))
+		fmt.Fprint(w, result)
+		return
+	}
 
 	if _, err := os.Stat(uploadFolder); os.IsNotExist(err) {
 		os.Mkdir(uploadFolder, 0777)
@@ -309,6 +310,12 @@ func getUniqFileName(filename string) string {
 }
 
 func getLastFileHandler(w http.ResponseWriter, r *http.Request) {
+	if !checkSecret(r.Header.Get("secret")) {
+		verbose("Got wrong secret from client")
+		result := UploadStatusJson(FailedStatus, fmt.Sprintf("Error getting last file. Secret mismatch !!!"))
+		fmt.Fprint(w, result)
+		return
+	}
 	fileList := getAllFiles()
 	lastFile := fileList[0]
 	for _, file := range fileList {
@@ -384,8 +391,10 @@ func getAllFilesConcurrent(Dir string, fileNamesWithTime *[]fileInfo) {
 
 func getAllFilesHandler(w http.ResponseWriter, r *http.Request) {
 	verbose(fmt.Sprint("getting All files.."))
-	if !checkSecret(r.Header.Get("secret")){
+	if !checkSecret(r.Header.Get("secret")) {
 		verbose("Got wrong secret from client")
+		result := UploadStatusJson(FailedStatus, "secret mismatch")
+	fmt.Fprintln(w, result)
 		return
 	}
 	var fileNamesWithTime = getAllFiles()
@@ -402,25 +411,63 @@ func getAllFilesHandler(w http.ResponseWriter, r *http.Request) {
 }
 
 func getFileHandler(w http.ResponseWriter, r *http.Request) {
-	fileName := r.URL.Path
-	fileName = strings.Replace(fileName, "/getFile/", "", -1)
-	fileName, err := url.QueryUnescape(fileName)
+	u, err := url.ParseQuery(r.URL.RawQuery)
+    if err != nil {
+        panic(err)
+    }
+	fileName :=u["fileName"][0]
+	if fileName==""{
+		verbose("Error getting file name !!!")
+		fmt.Fprint(w, fmt.Sprintf("Error getting file name from URL !!!"))
+		return
+	}
+	fileName, err = url.QueryUnescape(fileName)
 	if err != nil {
 		log.Println(err)
 	}
-	log.Println(fileName)
+	secretRcvd :=u["secret"][0]
+	if secretRcvd==""{
+		verbose("Error getting file name !!!")
+		fmt.Fprint(w, fmt.Sprintf("Error getting secret URL !!!"))
+		return
+	}
+	if !checkSecret(secretRcvd) {
+		verbose("Got wrong secret from client")
+		fmt.Fprint(w, fmt.Sprintf("Error getting file:%v. Secret mismatch !!!", fileName))
+		return
+	}
 	verbose(fmt.Sprintln("getting File : ", fileName))
 	http.ServeFile(w, r, path.Join(uploadFolder, fileName))
 	//http.ServeContent(w, r, path.Join(uploadFolder, fileName))
 
 }
 func serveThisFileHandler(w http.ResponseWriter, r *http.Request) {
-	fileName := r.URL.Path
-	fileName = strings.Replace(fileName, "/downLoadFile/", "", -1)
-	fileName, err := url.QueryUnescape(fileName)
+	u, err := url.ParseQuery(r.URL.RawQuery)
+    if err != nil {
+        panic(err)
+    }
+	fileName :=u["fileName"][0]
+	if fileName==""{
+		verbose("Error getting file name !!!")
+		fmt.Fprint(w, fmt.Sprintf("Error getting file name from URL !!!"))
+		return
+	}
+	fileName, err = url.QueryUnescape(fileName)
 	if err != nil {
 		log.Println(err)
 	}
+	secretRcvd :=u["secret"][0]
+	if secretRcvd==""{
+		verbose("Error getting file name !!!")
+		fmt.Fprint(w, fmt.Sprintf("Error getting secret URL !!!"))
+		return
+	}
+	if !checkSecret(secretRcvd) {
+		verbose("Got wrong secret from client")
+		result := UploadStatusJson(FailedStatus, fmt.Sprintf("Error getting file:%v. Secret mismatch !!!", fileName))
+		fmt.Fprint(w, result)
+		return
+	}
 	verbose(fmt.Sprintln("serving File : ", fileName))
 	//Adapted from https://stackoverflow.com/questions/31638447/how-to-server-a-file-from-a-handler-in-golang
 	w.Header().Set("Content-Description", "File Transfer")

LDrop.go

@@ -9,6 +9,7 @@
 <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js" integrity="sha384-alpBpkh1PFOepccYVYDB4do5UnbKysX5WZXm3XxPqe5iKTfUKjNkCk9SaVuEZflJ" crossorigin="anonymous"></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/handlebars.js/4.0.11/handlebars.js"></script>
         <script src="/js.cookie.js"></script>
+        <script src="/md5.min.js"></script>
 <link rel="stylesheet" href="/bootstrap.min.css" >
 <body onload="listFiles()">
 <h1>LocalDrop</h1>
@@ -44,14 +45,15 @@ <h1>LocalDrop</h1>
     <td>{{this.ModTime}}</td>
     <td>{{this.Size}}</td>
     <td><a class="btn btn-outline-success" href="/viewFile/{{this.Name}}"  role="button">View</a></td>
-    <td><a class="btn btn-outline-info" href="/downLoadFile/{{this.Name}}" target="_blank" role="button" download >Download</a></td>
+    <td><a class="btn btn-outline-info" href="/downLoadFile/?secret={{../Secret}}&fileName={{this.Name}}" target="_blank" role="button" download >Download</a></td>
 </tr>
 {{/each}}
 </tbody>
 </table>
 </div>
 </script>
 <script>
+
         var getSecret=function(){
             var secret=Cookies.get('secret');
             if (secret===undefined){
@@ -65,8 +67,9 @@ <h1>LocalDrop</h1>
     }
             }
             secret=Cookies.get('secret');
-            return secret;
+            return md5(secret);
         };
+
 var upload = function () {
     var uploadForm=document.forms.namedItem("uploadForm");
     var formData = new FormData(uploadForm);
@@ -87,7 +90,7 @@ <h1>LocalDrop</h1>
 }
 };
     xhr.open('POST', '/upload', true);
-    xhr.setRequestHeader("secret", "007");
+    xhr.setRequestHeader("secret", secret);
     xhr.send(formData);
 };
 
@@ -96,30 +99,37 @@ <h1>LocalDrop</h1>
     var xhr = new XMLHttpRequest();
         xhr.onreadystatechange = function() {
 if (this.readyState == 4 && this.status == 200) {
-    var response=JSON.parse(this.responseText);
-if (response.Status !=='Ok'){
+    var response = JSON.parse(this.responseText);
+if (response.Status === 'Err' && response.Description === "secret mismatch"){
     console.error(response.Status);
+    var secretPrompt = prompt("Secret mismatch. Please enter secret:", "");
+if (secretPrompt == null || secretPrompt === "") {
+    console.log("plz enter secret !?");
+} else {
+    Cookies.set('secret', secretPrompt);
+    console.log("set secret as " + secretPrompt);
+}
     return;
 }
-    var FileTable=JSON.parse(response.Description);
+
+    var FileTable = JSON.parse(response.Description);
     console.log(FileTable);
     var FileTableNode = document.getElementById("FileTable");
     while (FileTableNode.hasChildNodes()) {
         FileTableNode.removeChild(FileTableNode.lastChild);
     }
-    var source   = document.getElementById("fileTableTemplate").innerHTML;
+    var source = document.getElementById("fileTableTemplate").innerHTML;
     var template = Handlebars.compile(source);
-    var context = {FileTable:FileTable};
-    var html    = template(context);
-    FileTableNode.innerHTML=html;
-}
-};
+    var context = {FileTable: FileTable,Secret:getSecret()};
+    var html = template(context);
+    FileTableNode.innerHTML = html;
+
+}};
     xhr.open('POST', '/getAllFiles', true);
-    var secret=btoa(getSecret());
-    xhr.setRequestHeader("secret", secret);
+    xhr.setRequestHeader("secret", getSecret());
     xhr.send();
 };
-
+listFiles();
 
 </script>
 </html>

statik/statik.go

@@ -8,6 +8,8 @@
 <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js" integrity="sha384-vFJXuSJphROIrBnz7yo7oB41mKfc8JzQZiCq4NCceLEaO4IHwicKwpJf9c9IpFgh" crossorigin="anonymous"></script>
 <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js" integrity="sha384-alpBpkh1PFOepccYVYDB4do5UnbKysX5WZXm3XxPqe5iKTfUKjNkCk9SaVuEZflJ" crossorigin="anonymous"></script>
 <script src="https://cdnjs.cloudflare.com/ajax/libs/handlebars.js/4.0.11/handlebars.js"></script>
+<script src="/js.cookie.js"></script>
+        <script src="/md5.min.js"></script>
 <link rel="stylesheet" href="/bootstrap.min.css" >
 <style>
     .col-10 {
@@ -30,13 +32,29 @@ <h2 id="fileName">File: </h2>
 </body>
 <script>
     {{/*TODO add     xhr.setRequestHeader("secret", "007"); as url param*/}}
+    var getSecret=function(){
+            var secret=Cookies.get('secret');
+            if (secret===undefined){
+                console.log("secret not Set !!!!");
+                var secretPrompt = prompt("Please enter secret:", "007Jb");
+    if (secretPrompt == null || secretPrompt === "") {
+        console.log("plz enter secret !?");
+    } else {
+    Cookies.set('secret',secretPrompt);
+    console.log("set secret as "+secretPrompt);
+    }
+            }
+            secret=Cookies.get('secret');
+            return md5(secret);
+        };
     var requestFile=window.location.pathname;
-    requestFile=requestFile.replace("/viewFile/","");
     requestFile=decodeURI(requestFile);
     document.getElementById('fileName').innerHTML+=requestFile;
     console.log(requestFile);
-    document.getElementById('iframe').src="/getFile/"+requestFile;
-    document.getElementById('download').href="/downLoadFile/"+requestFile;
+    requestFile=requestFile.replace("/viewFile/","");
+    // title=Main_page&action=raw
+    document.getElementById('iframe').src="/getFile/?secret="+getSecret()+"&fileName="+requestFile;
+    document.getElementById('download').href="/downLoadFile/?secret="+getSecret()+"&fileName="+requestFile;
 
 </script>
 </html>