Create etag at time of media upload

content.py

@@ -471,6 +471,7 @@ def saveMediaInFormPOST(mediaBytes,debug: bool, \
     fd = open(filename, 'wb')
     fd.write(mediaBytes[startPos:])
     fd.close()
+
     return filename,attachmentMediaType
 
 def extractTextFieldsInPOST(postBytes,boundary,debug: bool) -> {}:

daemon.py

@@ -3626,6 +3626,7 @@ class PubServer(BaseHTTPRequestHandler):
             if filename:
                 if filename.endswith('.png') or \
                    filename.endswith('.jpg') or \
+                   filename.endswith('.webp') or \
                    filename.endswith('.gif'):
                     if self.server.debug:
                         print('DEBUG: POST media removing metadata')

media.py

@@ -13,6 +13,7 @@ import os
 import sys
 import json
 import datetime
+from hashlib import sha1
 from auth import createPassword
 from shutil import copyfile
 from shutil import rmtree
@@ -71,6 +72,36 @@ def getAttachmentMediaType(filename: str) -> str:
             return 'audio'
     return mediaType
 
+def updateEtag(mediaFilename: str) -> None:
+    """ calculate the etag, which is a sha1 of the data
+    """
+    # only create etags for media
+    if '/media/' not in mediaFilename:
+        return
+
+    # check that the media exists
+    if not os.path.isfile(mediaFilename):
+        return
+
+    # read the binary data
+    data=None
+    try:
+        with open(mediaFilename+, 'rb') as mediaFile:
+            data=mediaFile.read()                
+    except:
+        pass
+
+    if not data:
+        return
+    # calculate hash
+    etag=sha1(data).hexdigest()
+    # save the hash
+    try:
+        with open(mediaFilename+'.etag', 'w') as etagFile:
+            etagFile.write(etag)
+    except:
+        pass
+
 def attachMedia(baseDir: str,httpPrefix: str,domain: str,port: int, \
                 postJson: {},imageFilename: str, \
                 mediaType: str,description: str, \
@@ -127,7 +158,8 @@ def attachMedia(baseDir: str,httpPrefix: str,domain: str,port: int, \
             removeMetaData(imageFilename,mediaFilename)
         else:
             copyfile(imageFilename,mediaFilename)
-             
+        updateEtag(mediaFilename)
+
     return postJson
 
 def archiveMedia(baseDir: str,archiveDirectory: str,maxWeeks=4) -> None: