Blurhash implementation

media.py

@@ -11,6 +11,7 @@ import os
 import time
 import datetime
 import subprocess
+import random
 from random import randint
 from hashlib import sha1
 from auth import createPassword
@@ -28,6 +29,29 @@ from shutil import move
 from city import spoofGeolocation
 
 
+def _getBlurHash() -> str:
+    """You may laugh, but this is a lot less computationally intensive,
+    especially on large images, while still providing some visual variety
+    in the timeline
+    """
+    hashes = [
+        "UfGuaW01%gRi%MM{azofozo0V@xuozn#ofs.",
+        "UFD]o8-;9FIU~qD%j[%M-;j[ofWB?bt7IURj",
+        "UyO|v_1#im=s%y#U%OxDwRt3W9R-ogjHj[WX",
+        "U96vAQt6H;WBt7ofWBa#MbWBo#j[byaze-oe",
+        "UJKA.q01M|IV%LM|RjNGIVj[f6oLjrofaeof",
+        "U9MPjn]?~Cxut~.PS1%1xXIo0fEer_$*^jxG",
+        "UtLENXWCRjju~qayaeaz00j[ofayIVkCkCfQ",
+        "UHGbeg-pbzWZ.ANI$wsQ$H-;E9W?0Nx]?FjE",
+        "UcHU%#4n_ND%?bxatRWBIU%MazxtNaRjs:of",
+        "ULR:TsWr~6xZofWWf6s-~6oK9eR,oes-WXNJ",
+        "U77VQB-:MaMx%L%MogRkMwkCxuoIS*WYjEsl",
+        "U%Nm{8R+%MxuE1t6WBNG-=RjoIt6~Vj]RkR*",
+        "UCM7u;?boft7oft7ayj[~qt7WBoft7oft7Rj"
+    ]
+    return random.choice(hashes)
+
+
 def _replaceSiloDomain(postJsonObject: {},
                        siloDomain: str, replacementDomain: str,
                        systemLanguage: str) -> None:
@@ -308,6 +332,7 @@ def attachMedia(baseDir: str, httpPrefix: str,
         'url': httpPrefix + '://' + domain + '/' + mediaPath
     }
     if mediaType.startswith('image/'):
+        attachmentJson['blurhash'] = _getBlurHash()
         # find the dimensions of the image and add them as metadata
         attachImageWidth, attachImageHeight = \
             getImageDimensions(imageFilename)