Add HTTP redirect option (#77)

* add follow-redirects option

* update README

* README tweak

Author: bfreezy

README.md

@@ -192,6 +192,13 @@ In the LaunchDaemon add the following:
 <string>Basic dGVzdDp0ZXN0</string>
 ```
 
+#### Follow HTTP Redirects
+If your webserver needs to redirect InstallApplictions to fetch content from another URL, pass `--follow-redirects` in your LaunchDaemon. Useful for situations where content may be stored on a CDN or object storage.
+
+```xml
+<string>--follow-redirects</string>
+```
+
 ### DEPNotify
 InstallApplications can work in conjunction with DEPNotify to automatically create and manipulate the progress bar.
 

payload/Library/installapplications/installapplications.py

@@ -280,6 +280,9 @@ def download_if_needed(item, stage, type, opts, depnotifystatus):
         if opts.headers:
             item.update({'additional_headers':
                          {'Authorization': opts.headers}})
+        # Check if we need to follow redirects.
+        if opts.follow_redirects:
+            item.update({'follow_redirects': True})
         # Download the file once:
         iaslog('Starting download: %s' % (urllib.parse.unquote(itemurl)))
         if opts.depnotify:
@@ -404,6 +407,9 @@ def main():
     o.add_option('--userscript', default=None,
                  help=('Optional: Trigger a user script run.'),
                  action='store_true')
+    o.add_option('--follow-redirects', default=False,
+                 help=('Optional: Follow HTTP redirects.'),
+                 action='store_true')
 
     opts, args = o.parse_args()
 
@@ -517,6 +523,10 @@ def main():
         headers = {'Authorization': opts.headers}
         json_data.update({'additional_headers': headers})
 
+    # Check if we need to follow redirects.
+    if opts.follow_redirects:
+        item.update({'follow_redirects': True})
+
     # Delete the bootstrap file if it exists, to ensure it's up to date.
     if not opts.skip_validation:
         if os.path.isfile(jsonpath):