Merge pull request 'Add support for hyperlinks' (#1) from hyperlink into main

Reviewed-on: #1

internal/canvas/client.go

@@ -166,6 +166,14 @@ func (c *Client) DownloadModules(courseRoot string) {
 				fmt.Printf("%s- Found video tool: %s\n", indent, item.Title)
 				panopto.DownloadVideo(c.HTTPClient, c.AccessToken, c.CourseID, targetDir, item.URL, item.Title)
 
+			case "ExternalUrl":
+				if strings.Contains(item.ExternalURL, "panopto.eu") {
+					indent := strings.Repeat("  ", len(subHeaderStack)+1)
+					fmt.Printf("%s- Found direct video link: %s\n", indent, item.Title)
+
+					panopto.DownloadVideo(c.HTTPClient, c.AccessToken, c.CourseID, targetDir, item.ExternalURL, item.Title)
+				}
+
 			case "Page":
 				c.searchPageForVideos(item, targetDir)
 			}

internal/models/models.go

@@ -30,10 +30,11 @@ type Module struct {
 }
 
 type ModuleItem struct {
-	Title     string `json:"title"`
-	Type      string `json:"type"`
-	URL       string `json:"url"`
-	HTMLURL   string `json:"html_url"`
-	ContentID int    `json:"content_id"`
-	Indent    int    `json:"indent"`
+	Title       string `json:"title"`
+	Type        string `json:"type"`
+	URL         string `json:"url"`
+	HTMLURL     string `json:"html_url"`
+	ExternalURL string `json:"external_url"`
+	ContentID   int    `json:"content_id"`
+	Indent      int    `json:"indent"`
 }

internal/panopto/downloader.go

@@ -45,12 +45,13 @@ func DownloadVideo(httpClient *http.Client, accessToken, courseID, modDir, input
 	}
 
 	var launchURL string
+	isDirectLink := false
+
 	if strings.Contains(inputURL, "/api/v1/") {
 		launchURL = inputURL
-	} else if strings.Contains(inputURL, "panopto.eu") {
-		launchURL = fmt.Sprintf("%s/api/v1/courses/%s/external_tools/sessionless_launch?url=%s",
-			config.BaseURL, courseID, url.QueryEscape(inputURL))
 	} else {
+
+		isDirectLink = true
 		launchURL = fmt.Sprintf("%s/api/v1/courses/%s/external_tools/sessionless_launch?id=%s&launch_type=course_navigation",
 			config.BaseURL, courseID, config.PanoptoID)
 	}
@@ -70,6 +71,7 @@ func DownloadVideo(httpClient *http.Client, accessToken, courseID, modDir, input
 	resp.Body.Close()
 
 	if launchData.URL == "" {
+		fmt.Printf("    [!] No launch URL found (Video skipped)\n")
 		return
 	}
 
@@ -84,17 +86,21 @@ func DownloadVideo(httpClient *http.Client, accessToken, courseID, modDir, input
 	json.NewDecoder(bResp.Body).Decode(&bridgeData)
 	bResp.Body.Close()
 
-	formReq, _ := http.NewRequest("GET", bridgeData.SessionURL, nil)
-	formReq.Header.Set("User-Agent", config.UserAgent)
-	formResp, err := httpClient.Do(formReq)
+	formResp, err := httpClient.Get(bridgeData.SessionURL)
 	if err != nil {
 		return
 	}
-	formHTML, _ := io.ReadAll(formResp.Body)
+	formHTMLBytes, _ := io.ReadAll(formResp.Body)
 	formResp.Body.Close()
+	formHTML := string(formHTMLBytes)
 
-	action := utils.ResolveAction(bridgeData.SessionURL, string(formHTML))
-	formData := utils.ExtractFormFields(string(formHTML))
+	if strings.Contains(formHTML, "U hebt geen toegang") || strings.Contains(formHTML, "You do not have access") {
+		fmt.Printf("    [!] Access denied by Panopto (U hebt geen toegang). Skipping.\n")
+		return
+	}
+
+	action := utils.ResolveAction(bridgeData.SessionURL, formHTML)
+	formData := utils.ExtractFormFields(formHTML)
 
 	pReq, _ := http.NewRequest("POST", action, strings.NewReader(formData.Encode()))
 	pReq.Header.Set("Content-Type", "application/x-www-form-urlencoded")
@@ -150,7 +156,31 @@ func DownloadVideo(httpClient *http.Client, accessToken, courseID, modDir, input
 		}
 	}
 
+	// This is for making sure yt-dlp does not auto-start downloading all videos, when access to a hyperlink is denied
 	if finalURL != "" && !strings.Contains(finalURL, "NonFatalError") {
+
+		targetURL := finalURL
+		if isDirectLink {
+			targetURL = inputURL
+
+			checkReq, _ := http.NewRequest("GET", targetURL, nil)
+			checkReq.Header.Set("User-Agent", config.UserAgent)
+
+			checkResp, err := panoptoClient.Do(checkReq)
+			if err == nil {
+				checkResp.Body.Close()
+
+				if checkResp.StatusCode == http.StatusFound || checkResp.StatusCode == http.StatusSeeOther {
+					loc, _ := checkResp.Location()
+					if loc != nil && (strings.Contains(loc.String(), "Login.aspx") || strings.Contains(loc.String(), "Auth")) {
+						fmt.Printf("    [!] Video inaccessible (redirects to Login). Skipping to prevent mass download.\n")
+						return
+					}
+				}
+			}
+
+		}
+
 		cookieFile := filepath.Join(modDir, ".cookies_temp.txt")
 		cData := "# Netscape HTTP Cookie File\n"
 		panoptoDomain, _ := url.Parse("https://vub.cloud.panopto.eu")
@@ -162,14 +192,14 @@ func DownloadVideo(httpClient *http.Client, accessToken, courseID, modDir, input
 		fmt.Printf("    [*] Downloading video: %s\n", title)
 
 		ytCmd := getYoutubeDLCommand()
-
 		cmd := exec.Command(ytCmd,
 			"--no-playlist",
 			"--cookies", cookieFile,
 			"--referer", config.BaseURL+"/",
 			"-P", modDir,
 			"-o", utils.Sanitize(title)+".%(ext)s",
-			finalURL)
+			targetURL)
+
 		cmd.Stdout = os.Stdout
 		cmd.Stderr = os.Stderr
 		if err := cmd.Run(); err != nil {