dosubot[bot] commented on issue #32606:
URL: https://github.com/apache/superset/issues/32606#issuecomment-2715856915

   <!-- Answer -->
   To resolve the "Access Denied" error for Slack images in Apache Superset, 
you can update the `TALISMAN_CONFIG` to allow the new Slack CDN URL. Here's how 
you can do it:
   
   1. **Update the `TALISMAN_CONFIG`:** Modify the `img-src` directive to 
include the new Slack CDN URL (`https://cdn.brandfolder.io/`). Here's an 
example configuration:
   
      ```python
      TALISMAN_CONFIG = {
          "content_security_policy": {
              "base-uri": ["'self'"],
              "default-src": ["'self'"],
              "img-src": [
                  "'self'",
                  "blob:",
                  "data:",
                  "https://apachesuperset.gateway.scarf.sh";,
                  "https://static.scarf.sh/";,
                  "https://cdn.brandfolder.io/";,  # Updated Slack CDN URL
                  "ows.terrestris.de",
              ],
              "worker-src": ["'self'", "blob:"],
              "connect-src": [
                  "'self'",
                  "https://api.mapbox.com";,
                  "https://events.mapbox.com";,
              ],
              "object-src": "'none'",
              "style-src": [
                  "'self'",
                  "'unsafe-inline'",
              ],
              "script-src": ["'self'", "'strict-dynamic'"],
          },
          "content_security_policy_nonce_in": ["script-src"],
          "force_https": False,
          "session_cookie_secure": False,
      }
      ```
   
   2. **Enable Slack Avatars:** Ensure that `SLACK_ENABLE_AVATARS` is set to 
`True` in your configuration to allow Slack avatars to be fetched:
   
      ```python
      "SLACK_ENABLE_AVATARS": True,
      ```
   
   3. **Documentation:** Consider adding documentation to guide users on 
configuring external image sources securely, avoiding the use of wildcards.
   
   By following these steps, you should be able to load Slack images securely 
without encountering the "Access Denied" error.
   
   
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