JakeBreath
6962e483fc
Backend: - DownloadTask model + background thread runner: streams the file with progress (%, bytes, speed) and a cancel flag, then indexes it, names it J-<id>.<ext> and applies the e621 metadata - DownloadTaskViewSet (create/retrieve/cancel) replaces the synchronous endpoint; the status footer's worker counts now reflect download jobs - Client download proxy (/api/online/file/) streams an e621 original to the browser with Content-Disposition: attachment, restricted to the configured e621 CDN hosts so it cannot be used as an open proxy Frontend: - Online detail: progress bar with percentage, transferred size, speed and cancel while downloading; success links to the new J-ID - New 'Download to client' button available to everyone (guests too)
349 lines
11 KiB
Python
349 lines
11 KiB
Python
import hashlib
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import json
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import mimetypes
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import os
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import re
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import shutil
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import subprocess
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from pathlib import Path
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from django.conf import settings
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from django.http import FileResponse, Http404, HttpResponse
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from django.utils.text import get_valid_filename
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from .models import MediaItem, MediaLocation
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ALLOWED_EXTENSIONS = {
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".jpg",
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".jpeg",
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".png",
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".gif",
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".apng",
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".webp",
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".mp4",
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".webm",
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}
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VIDEO_EXTENSIONS = {".mp4", ".webm"}
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UPLOAD_FILE_SALT = "j621.upload-file"
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MEDIA_FILE_SALT = "j621.media-file"
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CHUNK_SIZE = 1024 * 1024
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RANGE_RE = re.compile(r"bytes=(\d*)-(\d*)$")
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def compute_md5(path):
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digest = hashlib.md5()
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with open(path, "rb") as handle:
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for chunk in iter(lambda: handle.read(CHUNK_SIZE), b""):
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digest.update(chunk)
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return digest.hexdigest()
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def index_file(path, folder):
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"""Index one file into MediaItem/MediaLocation.
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Returns (item, created_item, location, created_location).
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"""
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path = Path(path)
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folder = Path(folder)
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stat = path.stat()
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md5 = compute_md5(path)
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item, created_item = MediaItem.objects.get_or_create(
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md5=md5, defaults={"size": stat.st_size}
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)
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if not created_item and item.size != stat.st_size:
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item.size = stat.st_size
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item.save(update_fields=["size", "updated_at"])
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location, created_location = MediaLocation.objects.update_or_create(
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item=item,
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path=str(path),
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defaults={
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"rel_path": str(path.relative_to(folder)),
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"mtime": stat.st_mtime,
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},
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)
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return item, created_item, location, created_location
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def rename_location_to_j_id(item, location):
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"""Name a freshly indexed copy J-<id>.<ext> inside its own folder."""
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path = Path(location.path)
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if not path.exists():
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return location
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if path.stem == f"J-{item.id}":
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return location
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target = unique_destination(path.parent, f"J-{item.id}{path.suffix}")
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path.rename(target)
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parent = Path(location.rel_path).parent
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location.path = str(target)
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location.rel_path = (
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str(parent / target.name) if str(parent) != "." else target.name
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)
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location.save(update_fields=["path", "rel_path"])
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return location
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def parse_tags(raw):
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"""Normalize a comma-separated string or JSON list into a list of tags."""
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if raw is None:
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return None
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if isinstance(raw, (list, tuple)):
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values = raw
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else:
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text = str(raw).strip()
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if not text:
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return None
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if text.startswith("["):
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try:
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values = json.loads(text)
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except json.JSONDecodeError:
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values = text.split(",")
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else:
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values = text.split(",")
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cleaned = []
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for value in values:
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tag = str(value).strip()
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if tag and tag not in cleaned:
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cleaned.append(tag[:100])
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return cleaned
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def unique_destination(folder, filename):
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"""Return a non-existing path inside folder for the given filename."""
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folder = Path(folder)
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folder.mkdir(parents=True, exist_ok=True)
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filename = get_valid_filename(Path(filename).name) or "upload"
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candidate = folder / filename
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stem, suffix = candidate.stem, candidate.suffix
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counter = 1
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while candidate.exists():
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candidate = folder / f"{stem}-{counter}{suffix}"
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counter += 1
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return candidate
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class RangeFileWrapper:
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"""Iterate over a limited byte range of an open file."""
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def __init__(self, file, length, chunk_size=64 * 1024):
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self.file = file
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self.remaining = length
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self.chunk_size = chunk_size
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def __iter__(self):
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return self
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def __next__(self):
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if self.remaining <= 0:
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raise StopIteration
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data = self.file.read(min(self.chunk_size, self.remaining))
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if not data:
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raise StopIteration
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self.remaining -= len(data)
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return data
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def close(self):
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self.file.close()
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def serve_file(request, path, download=False):
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"""Serve a file with HTTP range support (needed for video seeking)."""
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path = Path(path)
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if not path.is_file():
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raise Http404
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size = path.stat().st_size
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content_type = mimetypes.guess_type(str(path))[0] or "application/octet-stream"
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range_header = request.headers.get("Range", "").strip()
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if range_header:
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match = RANGE_RE.match(range_header)
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if match:
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start_raw, end_raw = match.groups()
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if start_raw == "" and end_raw:
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length = min(int(end_raw), size)
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start, end = size - length, size - 1
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else:
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start = int(start_raw or 0)
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end = min(int(end_raw) if end_raw else size - 1, size - 1)
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if start >= size or start > end:
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response = HttpResponse(status=416)
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response["Content-Range"] = f"bytes */{size}"
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return response
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length = end - start + 1
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handle = open(path, "rb")
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handle.seek(start)
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response = FileResponse(
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RangeFileWrapper(handle, length),
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status=206,
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content_type=content_type,
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)
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response["Content-Length"] = str(length)
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response["Content-Range"] = f"bytes {start}-{end}/{size}"
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response["Accept-Ranges"] = "bytes"
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return response
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response = FileResponse(
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open(path, "rb"),
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content_type=content_type,
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as_attachment=download,
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filename=path.name,
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)
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response["Accept-Ranges"] = "bytes"
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return response
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class DownloadCancelled(Exception):
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"""Raised when a streamed download is cancelled by the user."""
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def download_file(
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url, destination, progress_callback=None, should_cancel=None
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):
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"""Stream a remote file into destination (used by Download to Library)."""
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import requests
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headers = {"User-Agent": settings.USER_AGENT}
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with requests.get(url, headers=headers, stream=True, timeout=120) as response:
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response.raise_for_status()
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total = int(response.headers.get("content-length") or 0)
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downloaded = 0
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with open(destination, "wb") as handle:
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for chunk in response.iter_content(chunk_size=CHUNK_SIZE):
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if should_cancel is not None and should_cancel():
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raise DownloadCancelled("download cancelled")
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if chunk:
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handle.write(chunk)
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downloaded += len(chunk)
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if progress_callback is not None:
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progress_callback(downloaded, total)
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if progress_callback is not None:
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progress_callback(downloaded, total or downloaded)
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E621_DESCRIPTION_LIMIT = 20000
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def trim_e621_post(post):
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"""Keep a compact, size-bounded copy of an e621 post payload."""
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if not isinstance(post, dict):
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return None
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file_data = post.get("file") or {}
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relationships = post.get("relationships") or {}
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score = post.get("score") or {}
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categories = post.get("tags") or {}
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return {
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"id": post.get("id"),
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"created_at": post.get("created_at"),
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"rating": post.get("rating"),
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"tags": {
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str(category): [str(tag)[:200] for tag in tags][:500]
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for category, tags in categories.items()
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if isinstance(tags, list)
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},
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"score": {
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"up": score.get("up"),
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"down": score.get("down"),
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"total": score.get("total"),
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},
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"fav_count": post.get("fav_count"),
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"comment_count": post.get("comment_count"),
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"sources": [
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str(source)[:500]
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for source in (post.get("sources") or [])
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if source
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][:20],
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"description": str(post.get("description") or "")[:E621_DESCRIPTION_LIMIT],
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"pools": [
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int(pool)
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for pool in (post.get("pools") or [])
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if str(pool).isdigit()
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][:50],
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"relationships": {
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"parent_id": relationships.get("parent_id"),
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"has_children": relationships.get("has_children"),
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},
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"file": {
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"md5": file_data.get("md5"),
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"ext": file_data.get("ext"),
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"size": file_data.get("size"),
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"width": file_data.get("width"),
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"height": file_data.get("height"),
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"url": file_data.get("url"),
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},
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"uploader_name": post.get("uploader_name"),
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}
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def sanitize_iqdb_results(results):
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"""Keep a compact, size-bounded copy of IQDB candidates."""
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cleaned = []
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for result in results[:10]:
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if not isinstance(result, dict):
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continue
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score = result.get("score")
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post_id = result.get("post_id")
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tags_preview = result.get("tags_preview")
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entry = {
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"post_id": post_id if isinstance(post_id, int) else None,
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"score": float(score) if isinstance(score, (int, float)) else None,
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"preview_url": str(result.get("preview_url") or "")[:500] or None,
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"rating": str(result.get("rating") or "")[:1] or None,
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"md5": str(result.get("md5") or "")[:32] or None,
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"score_total": (
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result.get("score_total")
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if isinstance(result.get("score_total"), int)
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else None
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),
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"fav_count": (
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result.get("fav_count")
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if isinstance(result.get("fav_count"), int)
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else None
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),
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"width": (
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result.get("width")
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if isinstance(result.get("width"), int)
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else None
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),
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"height": (
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result.get("height")
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if isinstance(result.get("height"), int)
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else None
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),
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"tags_preview": (
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[str(tag)[:100] for tag in tags_preview][:8]
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if isinstance(tags_preview, list)
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else []
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),
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}
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if entry["post_id"] or entry["preview_url"]:
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cleaned.append(entry)
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return cleaned
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def generate_video_thumbnail(md5, path):
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"""Extract a JPEG thumbnail from a video, cached under MEDIA_ROOT/thumbs."""
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if not shutil.which("ffmpeg"):
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return None
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thumbs_dir = Path(settings.MEDIA_ROOT) / "thumbs"
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thumbs_dir.mkdir(parents=True, exist_ok=True)
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target = thumbs_dir / f"{md5}.jpg"
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if target.exists() and target.stat().st_mtime >= os.path.getmtime(path):
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return target
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command = [
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"ffmpeg",
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"-y",
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"-ss",
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"0.5",
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"-i",
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str(path),
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"-frames:v",
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"1",
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"-vf",
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"scale=480:-2",
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"-loglevel",
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"error",
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str(target),
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]
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try:
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subprocess.run(command, check=True, capture_output=True, timeout=60)
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except (subprocess.SubprocessError, OSError):
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return None
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return target if target.exists() else None
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