mirror of
https://github.com/zulip/zulip.git
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584 lines
22 KiB
Python
584 lines
22 KiB
Python
import logging
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import os
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import re
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from collections.abc import Iterator
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from contextlib import contextmanager
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from dataclasses import dataclass
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import pyvips
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from bs4 import BeautifulSoup
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from bs4.formatter import EntitySubstitution, HTMLFormatter
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from django.utils.translation import gettext as _
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from typing_extensions import Self, override
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from zerver.lib.exceptions import ErrorCode, JsonableError
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from zerver.lib.mime_types import INLINE_MIME_TYPES
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from zerver.lib.queue import queue_event_on_commit
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from zerver.models import ImageAttachment
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DEFAULT_AVATAR_SIZE = 100
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MEDIUM_AVATAR_SIZE = 500
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DEFAULT_EMOJI_SIZE = 64
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# We refuse to deal with any image whose total pixelcount exceeds
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# this. This is chosen to be around a quarter of a gigabyte for a
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# 24-bit (3bpp) image.
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IMAGE_BOMB_TOTAL_PIXELS = 90000000
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IMAGE_MAX_ANIMATED_PIXELS = IMAGE_BOMB_TOTAL_PIXELS / 3
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# Reject emoji which, after resizing, have stills larger than this
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MAX_EMOJI_GIF_FILE_SIZE_BYTES = 128 * 1024 # 128 kb
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@dataclass(frozen=True)
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class BaseThumbnailFormat:
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extension: str
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max_width: int
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max_height: int
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animated: bool
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@override
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def __eq__(self, other: object) -> bool:
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if not isinstance(other, BaseThumbnailFormat):
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return False
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return str(self) == str(other)
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@override
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def __str__(self) -> str:
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animated = "-anim" if self.animated else ""
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return f"{self.max_width}x{self.max_height}{animated}.{self.extension}"
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@classmethod
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def from_string(cls, format_string: str) -> Self | None:
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format_parts = re.match(r"(\d+)x(\d+)(-anim)?\.(\w+)$", format_string)
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if format_parts is None:
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return None
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return cls(
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max_width=int(format_parts[1]),
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max_height=int(format_parts[2]),
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animated=format_parts[3] is not None,
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extension=format_parts[4],
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)
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@dataclass(frozen=True, eq=False)
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class ThumbnailFormat(BaseThumbnailFormat):
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opts: str | None = ""
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# Note that this is serialized into a JSONB column in the database,
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# and as such fields cannot be removed without a migration.
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@dataclass(frozen=True, eq=False)
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class StoredThumbnailFormat(BaseThumbnailFormat):
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content_type: str
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width: int
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height: int
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byte_size: int
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# Formats that we generate; the first animated and non-animated
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# options on this list are the ones which are written into
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# rendered_content.
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THUMBNAIL_OUTPUT_FORMATS = (
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# We generate relatively large default "thumbnails", so that
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# clients that do not understand the thumbnailing protocol
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# (e.g. mobile) get something which does not look pixelated. This
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# is also useful when the web client lightbox temporarily shows an
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# upsized thumbnail while loading the full resolution image.
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ThumbnailFormat("webp", 840, 560, animated=True),
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ThumbnailFormat("webp", 840, 560, animated=False),
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)
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# This format is generated, in addition to THUMBNAIL_OUTPUT_FORMATS,
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# for images in THUMBNAIL_ACCEPT_IMAGE_TYPES which are not in
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# INLINE_MIME_TYPES: somewhat-common image types which are not broadly
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# supported by browsers.
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TRANSCODED_IMAGE_FORMAT = ThumbnailFormat("webp", 4032, 3024, animated=False)
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# These are the image content-types which the server supports parsing
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# and thumbnailing; these do not need to supported on all browsers,
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# since we will the serving thumbnailed versions of them. Note that
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# this does not provide any *security*, since the content-type is
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# provided by the browser, and may not match the bytes they uploaded.
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#
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# This should be kept synced with the client-side image-picker in
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# web/upload_widget.ts. Any additions below must be accompanied by
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# changes to the pyvips block below as well.
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THUMBNAIL_ACCEPT_IMAGE_TYPES = frozenset(
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[
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"image/avif",
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"image/gif",
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"image/heic",
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"image/jpeg",
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"image/png",
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"image/tiff",
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"image/webp",
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]
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)
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# This is what enforces security limitations on which formats are
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# parsed; we disable all loaders, then re-enable the ones we support
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# -- then explicitly disable any "untrusted" ones, in case libvips for
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# some reason marks one of the above formats as such (because they are
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# no longer fuzzed, for instance).
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#
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# Note that only libvips >= 8.13 (Ubuntu 24.04 or later, Debian 12 or
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# later) supports this! These are no-ops on earlier versions of libvips.
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pyvips.operation_block_set("VipsForeignLoad", True)
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pyvips.operation_block_set("VipsForeignLoadHeif", False) # image/avif, image/heic
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pyvips.operation_block_set("VipsForeignLoadNsgif", False) # image/gif
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pyvips.operation_block_set("VipsForeignLoadJpeg", False) # image/jpeg
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pyvips.operation_block_set("VipsForeignLoadPng", False) # image/png
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pyvips.operation_block_set("VipsForeignLoadTiff", False) # image/tiff
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pyvips.operation_block_set("VipsForeignLoadWebp", False) # image/webp
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pyvips.block_untrusted_set(True)
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# Disable the operations cache; our only use here is thumbnail_buffer,
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# which does not make use of it.
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pyvips.voperation.cache_set_max(0)
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class BadImageError(JsonableError):
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code = ErrorCode.BAD_IMAGE
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@contextmanager
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def libvips_check_image(
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image_data: bytes | pyvips.Source, truncated_animation: bool = False
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) -> Iterator[pyvips.Image]:
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# The primary goal of this is to verify that the image is valid,
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# and raise BadImageError otherwise. The yielded `source_image`
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# may be ignored, since calling `thumbnail_buffer` is faster than
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# calling `thumbnail_image` on a pyvips.Image, since the latter
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# cannot make use of shrink-on-load optimizations:
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# https://www.libvips.org/API/current/libvips-resample.html#vips-thumbnail-image
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try:
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if isinstance(image_data, bytes):
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source_image = pyvips.Image.new_from_buffer(image_data, "")
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else:
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source_image = pyvips.Image.new_from_source(image_data, "", access="sequential")
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except pyvips.Error:
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raise BadImageError(_("Could not decode image; did you upload an image file?"))
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if not truncated_animation:
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# For places where we do not truncate animations (e.g. emoji,
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# where the original is never served to clients, so we must
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# preserve the full animation) we count total pixels across
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# all frames for the limit.
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if (
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source_image.width * source_image.height * source_image.get_n_pages()
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> IMAGE_BOMB_TOTAL_PIXELS
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):
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raise BadImageError(_("Image size exceeds limit."))
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else:
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# When thumbnailing image uploads, we truncate thumbnailed
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# animations, so we have different checks for animated vs
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# still images.
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if source_image.get_n_pages() == 1:
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if source_image.width * source_image.height > IMAGE_BOMB_TOTAL_PIXELS:
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raise BadImageError(_("Image size exceeds limit."))
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else:
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# For animated images, we have an additional limit -- we
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# want to be able to render at least 3 frames, and spend
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# no more than 1/3 of that IMAGE_BOMB_TOTAL_PIXELS budget
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# in doing so.
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if (
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source_image.width * source_image.height * min(3, source_image.get_n_pages())
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> IMAGE_MAX_ANIMATED_PIXELS
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):
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raise BadImageError(_("Image size exceeds limit."))
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try:
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yield source_image
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except pyvips.Error as e: # nocoverage
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logging.exception(e)
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raise BadImageError(_("Image is corrupted or truncated"))
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def resize_avatar(image_data: bytes, size: int = DEFAULT_AVATAR_SIZE) -> bytes:
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# This will scale up, if necessary, and will scale the smallest
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# dimension to fit. That is, a 1x1000 image will end up with the
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# one middle pixel enlarged to fill the full square.
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with libvips_check_image(image_data):
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return pyvips.Image.thumbnail_buffer(
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image_data,
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size,
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height=size,
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crop=pyvips.Interesting.CENTRE,
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).write_to_buffer(".png")
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def resize_realm_icon(image_data: bytes) -> bytes:
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return resize_avatar(image_data)
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def resize_logo(image_data: bytes) -> bytes:
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# This will only scale the image down, and will resize it to
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# preserve aspect ratio and be contained within 8*AVATAR by AVATAR
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# pixels; it does not add any padding to make it exactly that
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# size. A 1000x10 pixel image will end up as 800x8; a 10x10 will
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# end up 10x10.
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with libvips_check_image(image_data):
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return pyvips.Image.thumbnail_buffer(
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image_data,
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8 * DEFAULT_AVATAR_SIZE,
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height=DEFAULT_AVATAR_SIZE,
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size=pyvips.Size.DOWN,
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).write_to_buffer(".png")
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def resize_emoji(
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image_data: bytes, emoji_file_name: str, size: int = DEFAULT_EMOJI_SIZE
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) -> tuple[bytes, bytes | None]:
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# Square brackets are used for providing options to libvips' save
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# operation; the extension on the filename comes from reversing
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# the content-type, which removes most of the attacker control of
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# this string, but assert it has no bracketed pieces for safety.
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write_file_ext = os.path.splitext(emoji_file_name)[1]
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assert "[" not in write_file_ext
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# This function returns two values:
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# 1) Emoji image data.
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# 2) If it is animated, the still image data i.e. first frame of gif.
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with libvips_check_image(image_data) as source_image:
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if source_image.get_n_pages() == 1:
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return (
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pyvips.Image.thumbnail_buffer(
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image_data,
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size,
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height=size,
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crop=pyvips.Interesting.CENTRE,
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).write_to_buffer(write_file_ext),
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None,
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)
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first_still = pyvips.Image.thumbnail_buffer(
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image_data,
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size,
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height=size,
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crop=pyvips.Interesting.CENTRE,
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).write_to_buffer(".png")
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animated = pyvips.Image.thumbnail_buffer(
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image_data,
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size,
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height=size,
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# This is passed to the loader, and means "load all
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# frames", instead of the default of just the first
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option_string="n=-1",
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)
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if animated.width != animated.get("page-height"):
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# If the image is non-square, we have to iterate the
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# frames to add padding to make it so
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if not animated.hasalpha():
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animated = animated.addalpha()
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frames = [
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frame.gravity(
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pyvips.CompassDirection.CENTRE,
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size,
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size,
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extend=pyvips.Extend.BACKGROUND,
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background=[0, 0, 0, 0],
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)
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for frame in animated.pagesplit()
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]
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animated = frames[0].pagejoin(frames[1:])
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return (animated.write_to_buffer(write_file_ext), first_still)
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def missing_thumbnails(
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image_attachment: ImageAttachment,
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) -> list[ThumbnailFormat]:
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seen_thumbnails: set[StoredThumbnailFormat] = set()
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for existing_thumbnail in image_attachment.thumbnail_metadata:
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seen_thumbnails.add(StoredThumbnailFormat(**existing_thumbnail))
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potential_output_formats = list(THUMBNAIL_OUTPUT_FORMATS)
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if image_attachment.content_type not in INLINE_MIME_TYPES:
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if image_attachment.original_width_px >= image_attachment.original_height_px:
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additional_format = ThumbnailFormat(
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TRANSCODED_IMAGE_FORMAT.extension,
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TRANSCODED_IMAGE_FORMAT.max_width,
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TRANSCODED_IMAGE_FORMAT.max_height,
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TRANSCODED_IMAGE_FORMAT.animated,
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)
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else:
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additional_format = ThumbnailFormat(
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TRANSCODED_IMAGE_FORMAT.extension,
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# Swap width and height to make a portrait-oriented version
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TRANSCODED_IMAGE_FORMAT.max_height,
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TRANSCODED_IMAGE_FORMAT.max_width,
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TRANSCODED_IMAGE_FORMAT.animated,
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)
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potential_output_formats.append(additional_format)
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# We use the shared `__eq__` method from BaseThumbnailFormat to
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# compare between the StoredThumbnailFormat values pulled from the
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# database, and the ThumbnailFormat values in
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# THUMBNAIL_OUTPUT_FORMATS.
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needed_thumbnails = [
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thumbnail_format
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for thumbnail_format in potential_output_formats
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if thumbnail_format not in seen_thumbnails
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]
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if image_attachment.frames == 1:
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# We do not generate -anim versions if the source is still
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needed_thumbnails = [
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thumbnail_format
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for thumbnail_format in needed_thumbnails
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if not thumbnail_format.animated
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]
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return needed_thumbnails
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def maybe_thumbnail(
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content: bytes | pyvips.Source,
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content_type: str | None,
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path_id: str,
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realm_id: int,
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skip_events: bool = False,
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) -> ImageAttachment | None:
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if content_type not in THUMBNAIL_ACCEPT_IMAGE_TYPES:
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# If it doesn't self-report as an image file that we might want
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# to thumbnail, don't parse the bytes at all.
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return None
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try:
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# This only attempts to read the header, not the full image content
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with libvips_check_image(content, truncated_animation=True) as image:
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# "original_width_px" and "original_height_px" here are
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# _as rendered_, after applying the orientation
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# information which the image may contain.
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if (
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"orientation" in image.get_fields()
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and image.get("orientation") >= 5
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and image.get("orientation") <= 8
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):
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(width, height) = (image.height, image.width)
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else:
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(width, height) = (image.width, image.height)
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image_row = ImageAttachment.objects.create(
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realm_id=realm_id,
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path_id=path_id,
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original_width_px=width,
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original_height_px=height,
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frames=image.get_n_pages(),
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thumbnail_metadata=[],
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content_type=content_type,
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)
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if not skip_events:
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# The only reason to skip sending thumbnail events is
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# during import, when the events are separately
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# enqueued during message rendering; thumbnailing them
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# before/during message rendering can cause race
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# conditions.
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queue_event_on_commit("thumbnail", {"id": image_row.id})
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return image_row
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except BadImageError:
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return None
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def get_image_thumbnail_path(
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image_attachment: ImageAttachment,
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thumbnail_format: BaseThumbnailFormat,
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) -> str:
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return f"thumbnail/{image_attachment.path_id}/{thumbnail_format!s}"
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def split_thumbnail_path(file_path: str) -> tuple[str, BaseThumbnailFormat]:
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assert file_path.startswith("thumbnail/")
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path_parts = file_path.split("/")
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thumbnail_format = BaseThumbnailFormat.from_string(path_parts.pop())
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assert thumbnail_format is not None
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path_id = "/".join(path_parts[1:])
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return path_id, thumbnail_format
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@dataclass
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class MarkdownImageMetadata:
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url: str | None
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is_animated: bool
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original_width_px: int
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original_height_px: int
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original_content_type: str | None
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transcoded_image: StoredThumbnailFormat | None = None
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|
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def get_user_upload_previews(
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realm_id: int,
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content: str,
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lock: bool = False,
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enqueue: bool = True,
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path_ids: list[str] | None = None,
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) -> dict[str, MarkdownImageMetadata]:
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if path_ids is None:
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path_ids = re.findall(r"/user_uploads/(\d+/[/\w.-]+)", content)
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if not path_ids:
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return {}
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upload_preview_data: dict[str, MarkdownImageMetadata] = {}
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image_attachments = ImageAttachment.objects.filter(
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realm_id=realm_id, path_id__in=path_ids
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).order_by("id")
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if lock:
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image_attachments = image_attachments.select_for_update(of=("self",))
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for image_attachment in image_attachments:
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if image_attachment.thumbnail_metadata == []:
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# Image exists, and header of it parsed as a valid image,
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# but has not been thumbnailed yet; we will render a
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# spinner.
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upload_preview_data[image_attachment.path_id] = MarkdownImageMetadata(
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url=None,
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is_animated=False,
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original_width_px=image_attachment.original_width_px,
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original_height_px=image_attachment.original_height_px,
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original_content_type=image_attachment.content_type,
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)
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# We re-queue the row for thumbnailing to make sure that
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# we do eventually thumbnail it (e.g. if this is a
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# historical upload from before this system, which we
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# backfilled ImageAttachment rows for); this is a no-op in
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# the worker if all of the currently-configured thumbnail
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# formats have already been generated.
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if enqueue:
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queue_event_on_commit("thumbnail", {"id": image_attachment.id})
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else:
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url, is_animated = get_default_thumbnail_url(image_attachment)
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upload_preview_data[image_attachment.path_id] = MarkdownImageMetadata(
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url=url,
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is_animated=is_animated,
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original_width_px=image_attachment.original_width_px,
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original_height_px=image_attachment.original_height_px,
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original_content_type=image_attachment.content_type,
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transcoded_image=get_transcoded_format(image_attachment),
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)
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return upload_preview_data
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|
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def get_default_thumbnail_url(image_attachment: ImageAttachment) -> tuple[str, bool]:
|
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# For "dumb" clients which cannot rewrite it into their
|
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# preferred format and size, we choose the first one in
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# THUMBNAIL_OUTPUT_FORMATS which matches the animated/not
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# nature of the source image.
|
|
found_format: ThumbnailFormat | None = None
|
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for thumbnail_format in THUMBNAIL_OUTPUT_FORMATS:
|
|
if thumbnail_format.animated == (image_attachment.frames > 1):
|
|
found_format = thumbnail_format
|
|
break
|
|
if found_format is None:
|
|
# No animated thumbnail formats exist somehow, and the
|
|
# image is animated? Just take the first thumbnail
|
|
# format.
|
|
found_format = THUMBNAIL_OUTPUT_FORMATS[0]
|
|
return (
|
|
"/user_uploads/" + get_image_thumbnail_path(image_attachment, found_format),
|
|
found_format.animated,
|
|
)
|
|
|
|
|
|
def get_transcoded_format(
|
|
image_attachment: ImageAttachment,
|
|
) -> StoredThumbnailFormat | None:
|
|
# Returns None if the original content-type is judged to be
|
|
# renderable inline. Otherwise, we return the largest thumbnail
|
|
# that we generated. Since formats which are thumbnailable but
|
|
# not in INLINE_MIME_TYPES get an extra large-resolution thumbnail
|
|
# added to their list of formats, this is thus either None or a
|
|
# high-resolution thumbnail.
|
|
if image_attachment.content_type is None or image_attachment.content_type in INLINE_MIME_TYPES:
|
|
return None
|
|
|
|
thumbs_by_size = sorted(
|
|
(StoredThumbnailFormat(**d) for d in image_attachment.thumbnail_metadata),
|
|
key=lambda t: t.width * t.height,
|
|
)
|
|
return thumbs_by_size.pop() if thumbs_by_size else None
|
|
|
|
|
|
# Like HTMLFormatter.REGISTRY["html5"], this formatter avoids producing
|
|
# self-closing tags, but it differs by avoiding unnecessary escaping with
|
|
# HTML5-specific entities that cannot be parsed by lxml and libxml2
|
|
# (https://bugs.launchpad.net/lxml/+bug/2031045).
|
|
html_formatter = HTMLFormatter(
|
|
entity_substitution=EntitySubstitution.substitute_xml, # not substitute_html
|
|
void_element_close_prefix="",
|
|
empty_attributes_are_booleans=True,
|
|
)
|
|
|
|
|
|
def rewrite_thumbnailed_images(
|
|
rendered_content: str,
|
|
images: dict[str, MarkdownImageMetadata],
|
|
to_delete: set[str] | None = None,
|
|
) -> tuple[str | None, set[str]]:
|
|
if not images and not to_delete:
|
|
return None, set()
|
|
|
|
remaining_thumbnails = set()
|
|
parsed_message = BeautifulSoup(rendered_content, "html.parser")
|
|
|
|
changed = False
|
|
for inline_image_div in parsed_message.find_all("div", class_="message_inline_image"):
|
|
image_link = inline_image_div.find("a")
|
|
if (
|
|
image_link is None
|
|
or image_link["href"] is None
|
|
or not image_link["href"].startswith("/user_uploads/")
|
|
):
|
|
# This is not an inline image generated by the markdown
|
|
# processor for a locally-uploaded image.
|
|
continue
|
|
image_tag = image_link.find("img", class_="image-loading-placeholder")
|
|
if image_tag is None:
|
|
# The placeholder was already replaced -- for instance,
|
|
# this is expected if multiple images are included in the
|
|
# same message. The second time this is run, for the
|
|
# second image, the first image will have no placeholder.
|
|
continue
|
|
|
|
path_id = image_link["href"].removeprefix("/user_uploads/")
|
|
if to_delete and path_id in to_delete:
|
|
# This was not a valid thumbnail target, for some reason.
|
|
# Trim out the whole "message_inline_image" element, since
|
|
# it's not going be renderable by clients either.
|
|
inline_image_div.decompose()
|
|
changed = True
|
|
continue
|
|
|
|
image_data = images.get(path_id)
|
|
if image_data is None:
|
|
# The message has multiple images, and we're updating just
|
|
# one image, and it's not this one. Leave this one as-is.
|
|
remaining_thumbnails.add(path_id)
|
|
elif image_data.url is None:
|
|
# We're re-rendering the whole message, so fetched all of
|
|
# the image metadata rows; this is one of the images we
|
|
# about, but is not thumbnailed yet.
|
|
remaining_thumbnails.add(path_id)
|
|
else:
|
|
changed = True
|
|
del image_tag["class"]
|
|
image_tag["src"] = image_data.url
|
|
image_tag["data-original-dimensions"] = (
|
|
f"{image_data.original_width_px}x{image_data.original_height_px}"
|
|
)
|
|
image_tag["data-original-content-type"] = image_data.original_content_type
|
|
if image_data.is_animated:
|
|
image_tag["data-animated"] = "true"
|
|
if image_data.transcoded_image is not None:
|
|
image_tag["data-transcoded-image"] = str(image_data.transcoded_image)
|
|
|
|
if changed:
|
|
return (
|
|
parsed_message.encode(formatter=html_formatter).decode().strip(),
|
|
remaining_thumbnails,
|
|
)
|
|
else:
|
|
return None, remaining_thumbnails
|