Include width and height metadata for attached images

media.py

@@ -9,6 +9,7 @@ __module_group__ = "Timeline"
 
 import os
 import datetime
+import subprocess
 from random import randint
 from hashlib import sha1
 from auth import createPassword
@@ -245,6 +246,13 @@ def attachMedia(baseDir: str, httpPrefix: str,
     }
     if mediaType.startswith('image/'):
         attachmentJson['focialPoint'] = [0.0, 0.0]
+        # find the dimensions of the image and add them as metadata
+        attachImageWidth, attachImageHeight = \
+            getImageDimensions(imageFilename)
+        if attachImageWidth and attachImageHeight:
+            attachmentJson['width'] = attachImageWidth
+            attachmentJson['height'] = attachImageHeight
+
     postJson['attachment'] = [attachmentJson]
 
     if baseDir:
@@ -298,3 +306,25 @@ def pathIsAudio(path: str) -> bool:
        path.endswith('.mp3'):
         return True
     return False
+
+
+def getImageDimensions(imageFilename: str) -> (int, int):
+    """Returns the dimensions of an image file
+    """
+    try:
+        result = subprocess.run(['identify', '-format', '"%wx%h"',
+                                 imageFilename], stdout=subprocess.PIPE)
+    except BaseException:
+        return None, None
+    if not result:
+        return None, None
+    dimensionsStr = result.stdout.decode('utf-8').replace('"', '')
+    if 'x' not in dimensionsStr:
+        return None, None
+    widthStr = dimensionsStr.split('x')[0]
+    if not widthStr.isdigit():
+        return None, None
+    heightStr = dimensionsStr.split('x')[1]
+    if not heightStr.isdigit():
+        return None, None
+    return int(widthStr), int(heightStr)

tests.py

@@ -86,6 +86,7 @@ from announce import sendAnnounceViaServer
 from city import parseNogoString
 from city import spoofGeolocation
 from city import pointInNogo
+from media import getImageDimensions
 from media import getMediaPath
 from media import getAttachmentMediaType
 from delete import sendDeleteViaServer
@@ -792,6 +793,10 @@ def testPostMessageBetweenServers():
     alicePersonCache = {}
     aliceCachedWebfingers = {}
     attachedImageFilename = baseDir + '/img/logo.png'
+    testImageWidth, testImageHeight = \
+        getImageDimensions(attachedImageFilename)
+    assert testImageWidth
+    assert testImageHeight
     mediaType = getAttachmentMediaType(attachedImageFilename)
     attachedImageDescription = 'Logo'
     isArticle = False
@@ -875,6 +880,20 @@ def testPostMessageBetweenServers():
         assert 'Why is a mouse when it spins?' in \
             receivedJson['object']['content']
         assert 'यह एक परीक्षण है' in receivedJson['object']['content']
+        print('Check that message received from Alice contains an attachment')
+        assert receivedJson['object']['attachment']
+        assert len(receivedJson['object']['attachment']) == 1
+        attached = receivedJson['object']['attachment'][0]
+        pprint(attached)
+        assert attached.get('type')
+        assert attached.get('url')
+        assert attached['mediaType'] == 'image/png'
+        assert '/media/' in attached['url']
+        assert attached['url'].endswith('.png')
+        assert attached.get('width')
+        assert attached.get('height')
+        assert attached['width'] > 0
+        assert attached['height'] > 0
 
     print('\n\n*******************************************************')
     print("Bob likes Alice's post")