[httpupload] Remove unused code

httpupload/thumbnail.py

-from gi.repository import GdkPixbuf
-import base64
-from io import BytesIO
-import os
-import sys
-import logging
-from urllib.parse import quote as urlquote
-try:
-    from PIL import Image
-    pil_available = True
-except:
-    pil_available = False
-
-log = logging.getLogger('gajim.plugin_system.httpupload.thumbnail')
-
-def scale_down_to(pixbuf, size):
-    # Creates a pixbuf that fits in the specified square of sizexsize
-    # while preserving the aspect ratio
-    # Returns scaled_pixbuf
-    image_width = pixbuf.get_width()
-    image_height = pixbuf.get_height()
-
-    if image_width > image_height:
-        if image_width > size:
-            image_height = int(size / float(image_width) * image_height)
-            image_width = int(size)
-    else:
-        if image_height > size:
-            image_width = int(size / float(image_height) * image_width)
-            image_height = int(size)
-
-    crop_pixbuf = pixbuf.scale_simple(image_width, image_height, GdkPixbuf.InterpType.BILINEAR)
-    return crop_pixbuf
-
-
-max_thumbnail_size = 2048
-max_thumbnail_dimension = 160
-base64_size_factor = 4/3
-def thumbnail(path_to_file):
-    """
-    Generates a JPEG thumbnail and base64-encodes, ensuring that the encoded
-    size is less than max_thumbnail_size bytes. If this is not possible, returns
-    None.
-    """
-    thumb = None
-    quality_steps = (100, 80, 60, 50, 40, 35, 30, 25, 23, 20, 18, 15, 13, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1)
-    # If the whole file is small enough, we'll just use that as a thumbnail
-    # without downsampling.
-    if os.path.getsize(path_to_file) * base64_size_factor < max_thumbnail_size:
-        with open(path_to_file, 'rb') as content_file:
-            thumb = urlquote(base64.standard_b64encode(content_file.read()), '')
-            log.info("Image small enough (%d bytes), not resampling" % len(thumb))
-            return thumb
-    elif pil_available:
-        log.info("PIL available, using it for image downsampling")
-        try:
-            for quality in quality_steps:
-                thumb = Image.open(path_to_file)
-                thumb.thumbnail((max_thumbnail_dimension, max_thumbnail_dimension), Image.ANTIALIAS)
-                output = BytesIO()
-                thumb.save(output, format='JPEG', quality=quality, optimize=True)
-                thumb = output.getvalue()
-                output.close()
-                thumb = urlquote(base64.standard_b64encode(thumb), '')
-                log.debug("pil thumbnail jpeg quality %d produces an image of size %d...", quality, len(thumb))
-                if len(thumb) < max_thumbnail_size:
-                    log.debug("Size is acceptable.")
-                    return thumb
-        except:
-            log.info("Exception occurred during PIL downsampling", exc_info=sys.exc_info())
-            thumb = None
-    # If we haven't returned by now we couldn't use PIL for one reason or
-    # another, so let's pass on to GdkPixbuf
-    log.info("using GdkPixBuf for image downsampling")
-    temp_file = None
-    try:
-        pixbuf = GdkPixbuf.Pixbuf.new_from_file(path_to_file)
-        scaled_pb = scale_down_to(pixbuf, max_thumbnail_dimension)
-        for quality in quality_steps:
-            success, thumb_raw = scaled_pb.save_to_bufferv("jpeg", ["quality"], [str(quality)])
-            log.debug("gdkpixbuf thumbnail jpeg quality %d produces an image of size %d...",
-                      quality,
-                      len(thumb_raw) * base64_size_factor)
-            if len(thumb_raw) * base64_size_factor < max_thumbnail_size:
-                log.debug("Size is acceptable.")
-                return urlquote(base64.standard_b64encode(thumb_raw))
-    except:
-        log.info("Exception occurred during GdkPixbuf downsampling, not providing thumbnail", exc_info=sys.exc_info())
-        return None
-    log.info("No acceptably small thumbnail was generated.")