new image paste module: imgur

weboob/tools/capabilities/paste.py

@@ -21,6 +21,7 @@
 
 
 from weboob.capabilities.paste import ICapPaste
+import binascii
 
 
 class BasePasteBackend(ICapPaste):
@@ -49,6 +50,26 @@ class BasePasteBackend(ICapPaste):
                 return e
 
 
+def image_mime(data_base64, supported_formats=('gif', 'jpeg', 'png')):
+    try:
+        beginning = data_base64[:24].decode('base64')
+    except binascii.Error, e:
+        return None
+
+    if 'gif' in supported_formats and 'GIF8' in beginning:
+        return 'image/gif'
+    elif 'jpeg' in supported_formats and 'JFIF' in beginning:
+        return 'image/jpeg'
+    elif 'png' in supported_formats and '\x89PNG' in beginning:
+        return 'image/png'
+    elif 'xcf' in supported_formats and 'gimp xcf' in beginning:
+        return 'image/x-xcf'
+    elif 'pdf' in supported_formats and '%PDF' in beginning:
+        return 'application/pdf'
+    elif 'tiff' in supported_formats and ('II\x00\x2a' in beginning or \
+          'MM\x2a\x00' in beginning):
+        return 'image/tiff'
+
 def test():
     class MockPasteBackend(BasePasteBackend):
         def __init__(self, expirations):