feat: basic active url validation:

- Does not check if the link is actually
	a video. Change isValidURL() for better
	validation

Signed-off-by: HeshamTB <hishaminv@gmail.com>

main.go

@@ -20,6 +20,11 @@ type DownloadFormats struct {
     audioOnly bool
 }
 
+type URLValidationCtx struct {
+    URL string
+    Valid bool
+}
+
 type apiMessageResponse struct {
     Message string
 }
@@ -169,6 +174,7 @@ func main() {
             }
         },
     )
+
     handler.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
         ctx := NewContext(r)
         formats := []DownloadFormats{}
@@ -185,6 +191,30 @@ func main() {
         }
     })
 
+    handler.HandleFunc("/valid-link", func(w http.ResponseWriter, r *http.Request) {
+
+        if r.Method != "POST" {
+            w.WriteHeader(400)
+            return
+        }
+
+        err := r.ParseForm()
+        if err != nil {
+            log.Println(err.Error())
+            w.WriteHeader(400)
+            return
+        }
+        
+        url := r.FormValue("URL")
+
+        ctx := URLValidationCtx{
+            URL: url,
+            Valid: isValidURL(url),
+        }
+
+        templates.ExecuteTemplate(w, "url-validation.html", ctx)
+    })
+
     wrappedHandler := NewLogger(handler)
     srv := http.Server{
         ReadTimeout: 10 * time.Second,

templates/download.html

@@ -13,14 +13,21 @@
     <main class="container">
         <h1>Viddle your fiddle</h1>
         <form hx-post="/download" hx-target="#get-btn" hx-swap="outerHTML" hx-indicator="#progress">
-                <label for="URL">Link</label>
                 <div class="grid">
-                    <input type="url" id="URL" name="URL" placeholder="Video Link" required>
-                    <!-- Select -->
+                    <div hx-target="this" hx-swap="outerHTML">
+                        <label>Link
+                            <input 
+                            type="url" id="URL" name="URL" 
+                            hx-post="/valid-link" hx-indicator="#url-validation-progress" required>
+                        </label>
+                    <progress class="htmx-indicator" id="url-validation-progress"></progress>
+                    </div>
+                    <label>Format
                         <select required>
                             <option value="" disabled selected>Format</option>
                             {{ range .Formats }} <option>{{ .VideoRes }}</option>{{ end }}
                         </select>
+                    </label>
                 </div>
                 <button id="get-btn">Get
                     <!-- <a class="htmx-indicator" href="#" aria-busy="true"></a> -->

templates/url-validation.html

@@ -0,0 +1,11 @@
+<div hx-target="this" hx-swap="outerHTML">
+    <label>
+        Link
+        <input name="URL" id="URL" type="url" hx-post="/valid-link" 
+        aria-invalid="{{ if .Valid }}false{{ else }}true{{ end }}" 
+        required value="{{ .URL }}"
+        hx-indicator="#url-validation-progress"
+        >
+    </label>
+        <progress class="htmx-indicator" id="url-validation-progress"></progress>
+</div>