Abort (kinda)

main.go

@@ -78,6 +78,7 @@ func startWebServer() {
 	http.HandleFunc("/select", handleSelect)
 	http.HandleFunc("/process", handleProcess)
 	http.HandleFunc("/progress", handleProgress)
+	http.HandleFunc("/abort", handleAbort)
 
 	fmt.Println("Starting web server on http://0.0.0.0:8080")
 	http.ListenAndServe(":8080", nil)
@@ -114,3 +115,23 @@ func parseMetadata(metadata string) Metadata {
 		Season: "S" + strings.TrimSpace(parts[2]),
 	}
 }
+
+func handleAbort(w http.ResponseWriter, r *http.Request) {
+	filename := r.URL.Query().Get("filename")
+	if filename == "" {
+		http.Error(w, "Filename is required", http.StatusBadRequest)
+		return
+	}
+
+	jobsMutex.Lock()
+	abortChan, exists := jobs[filename]
+	jobsMutex.Unlock()
+
+	if !exists {
+		http.Error(w, "Job not found", http.StatusNotFound)
+		return
+	}
+
+	close(abortChan)
+	fmt.Fprintf(w, "Abort signal sent for %s", filename)
+}

templates/progress

@@ -56,6 +56,18 @@
             margin-top: 10px;
             word-wrap: break-word;
         }
+        #abort-button {
+            background-color: #f44336;
+            color: white;
+            border: none;
+            padding: 10px 15px;
+            margin-top: 10px;
+            border-radius: 4px;
+            cursor: pointer;
+        }
+        #abort-button:hover {
+            background-color: #d32f2f;
+        }
         @media (max-width: 600px) {
             body {
                 padding: 10px;
@@ -84,6 +96,7 @@
         </div>
         <div id="currentFile"></div>
     </div>
+    <button id="abort-button" onclick="abortDownload()">Abort Download</button>
     <script>
         function updateProgress() {
             fetch('/progress?filename={{.Filename}}', {
@@ -103,6 +116,17 @@
                 });
         }
         updateProgress();
+
+        function abortDownload() {
+            fetch('/abort?filename={{.Filename}}', { method: 'POST' })
+                .then(response => {
+                    if (response.ok) {
+                        alert('Abort signal sent. The download will stop soon.');
+                    } else {
+                        alert('Failed to abort the download.');
+                    }
+                });
+        }
     </script>
 </body>
 </html>

utils.go

@@ -9,10 +9,16 @@ import (
 	"regexp"
 	"strconv"
 	"strings"
+	"sync"
 
 	"github.com/beevik/etree"
 )
 
+var (
+	jobsMutex sync.Mutex
+	jobs      = make(map[string]chan struct{})
+)
+
 func sanitizeFilename(filename string) string {
 	filename = regexp.MustCompile(`[<>:"/\\|?*]`).ReplaceAllString(filename, "_")
 
@@ -173,11 +179,28 @@ func filterSelectedItems(items []Item, selectedItems []string) []Item {
 }
 
 func processItems(filename string, items []Item) error {
+	jobsMutex.Lock()
+	abortChan := make(chan struct{})
+	jobs[filename] = abortChan
+	jobsMutex.Unlock()
+
+	defer func() {
+		jobsMutex.Lock()
+		delete(jobs, filename)
+		jobsMutex.Unlock()
+	}()
+
 	for i, item := range items {
-		updateProgress(filename, float64(i)/float64(len(items))*100, item.Filename)
-		err := downloadFile(item)
-		if err != nil {
-			fmt.Printf("Error downloading file: %v\n", err)
+		select {
+		case <-abortChan:
+			updateProgress(filename, 100, "Aborted")
+			return fmt.Errorf("download aborted")
+		default:
+			updateProgress(filename, float64(i)/float64(len(items))*100, item.Filename)
+			err := downloadFile(item)
+			if err != nil {
+				fmt.Printf("Error downloading file: %v\n", err)
+			}
 		}
 	}
 	updateProgress(filename, 100, "")