dtoro
7cf546af7a
Adds a new Map sidebar entry that plots photos by their EXIF GPS coordinates on a clustered Leaflet map. While wiring this up, the metadata extractor was reading unprefixed GPS keys that never exist in `exiftool -G -j` output AND assumed coordinates were already floats — every photo silently lost its GPS. The new extract_gps helper handles Composite/EXIF group prefixes and parses DMS strings, and lat/lon are stored as first-class indexed columns so the map can query them without parsing exif_json on every request. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
278 lines
10 KiB
Python
278 lines
10 KiB
Python
"""
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Metadata extraction service using ExifTool
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"""
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import json
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import logging
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import re
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import asyncio
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from datetime import datetime
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from typing import Dict, Optional
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import subprocess
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from pathlib import Path
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from celery import shared_task
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from sqlalchemy import select
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from app.database import AsyncSessionLocal
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from app.models import Photo
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logger = logging.getLogger(__name__)
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def parse_exif_datetime(date_str: str) -> Optional[datetime]:
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"""Parse EXIF datetime string to Python datetime"""
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if not date_str:
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return None
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# Common EXIF datetime formats
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formats = [
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"%Y:%m:%d %H:%M:%S",
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"%Y-%m-%d %H:%M:%S",
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"%Y:%m:%d %H:%M:%S.%f",
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"%Y-%m-%dT%H:%M:%S",
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"%Y-%m-%dT%H:%M:%S.%f",
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"%Y-%m-%dT%H:%M:%S%z"
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]
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for fmt in formats:
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try:
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return datetime.strptime(date_str, fmt)
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except ValueError:
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continue
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return None
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_DMS_RE = re.compile(
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r"""\s*
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(?P<deg>-?\d+(?:\.\d+)?)\s*(?:deg|°|d)?\s*
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(?:(?P<min>\d+(?:\.\d+)?)\s*[\'’m]?\s*)?
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(?:(?P<sec>\d+(?:\.\d+)?)\s*[\"”s]?\s*)?
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(?P<ref>[NSEW])?\s*$""",
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re.IGNORECASE | re.VERBOSE,
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)
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def _parse_coord(value, ref: str | None) -> float | None:
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"""Coerce a single GPS coordinate from any form ExifTool may emit.
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ExifTool's ``-j`` JSON output applies print conversion by default, so
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coordinates can come back as:
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* a number (``48.1278``) — happens for some sources / when ``-n`` is set
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* a plain DMS string (``"48 deg 7' 39.96\\""``) — bare ``EXIF:GPSLatitude``
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* a DMS-with-ref string (``"48 deg 7' 39.96\\" N"``) — ``Composite:GPSLatitude``
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The optional ``ref`` argument lets the caller pass an explicit
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``GPSLatitudeRef`` / ``GPSLongitudeRef`` ('N'/'S'/'E'/'W') when the
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string itself doesn't carry one. Returns signed decimal degrees, or
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``None`` if the value is unparseable.
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"""
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if value is None:
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return None
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# Numeric path — already decimal degrees, possibly already signed.
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if isinstance(value, (int, float)):
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out = float(value)
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else:
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m = _DMS_RE.match(str(value))
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if not m:
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return None
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deg = float(m.group('deg'))
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minutes = float(m.group('min') or 0)
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seconds = float(m.group('sec') or 0)
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out = abs(deg) + minutes / 60.0 + seconds / 3600.0
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if deg < 0:
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out = -out
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embedded_ref = m.group('ref')
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if embedded_ref:
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ref = embedded_ref
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if ref:
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r = ref[0].upper()
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if r in ('S', 'W'):
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out = -abs(out)
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elif r in ('N', 'E'):
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out = abs(out)
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return out
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def extract_gps(exif_data: Dict) -> tuple:
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"""Return (lat, lon) in signed decimal degrees, or (None, None).
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With ``exiftool -G -j`` GPS values are keyed under their group.
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``Composite:GPSLatitude`` / ``Composite:GPSLongitude`` carry the
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hemisphere reference inline (``"48 deg 7' 39.96\\" N"``) while the bare
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``EXIF:GPSLatitude`` / ``EXIF:GPSLongitude`` need the separate
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``EXIF:GPSLatitudeRef`` / ``EXIF:GPSLongitudeRef`` to know the sign.
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Pre-fix this function read the *unprefixed* keys ``GPSLatitude`` /
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``GPSLongitude`` (which never exist in ``-G`` output) AND assumed
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they were already floats — so it silently dropped every photo's GPS.
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"""
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lat = _parse_coord(exif_data.get('Composite:GPSLatitude'), None)
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lon = _parse_coord(exif_data.get('Composite:GPSLongitude'), None)
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if lat is None or lon is None:
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lat = _parse_coord(
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exif_data.get('EXIF:GPSLatitude'),
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exif_data.get('EXIF:GPSLatitudeRef'),
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)
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lon = _parse_coord(
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exif_data.get('EXIF:GPSLongitude'),
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exif_data.get('EXIF:GPSLongitudeRef'),
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)
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if lat is None or lon is None:
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return None, None
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if not (-90 <= lat <= 90 and -180 <= lon <= 180):
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return None, None
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# Some cameras emit (0, 0) when they have no GPS lock — treat as missing
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if lat == 0 and lon == 0:
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return None, None
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return lat, lon
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def extract_key_metadata(exif_data: Dict) -> Dict:
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"""Extract key metadata fields for FTS indexing"""
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key_fields = []
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# Camera information
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if 'EXIF:Make' in exif_data:
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key_fields.append(exif_data['EXIF:Make'])
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if 'EXIF:Model' in exif_data:
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key_fields.append(exif_data['EXIF:Model'])
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if 'EXIF:LensModel' in exif_data:
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key_fields.append(exif_data['EXIF:LensModel'])
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# Location information
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lat, lon = extract_gps(exif_data)
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if lat is not None and lon is not None:
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key_fields.append(f"GPS: {lat}, {lon}")
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# IPTC/XMP keywords
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keywords = exif_data.get('IPTC:Keywords') or exif_data.get('XMP:Subject')
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if keywords:
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if isinstance(keywords, list):
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key_fields.extend(keywords)
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else:
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key_fields.append(keywords)
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# Copyright and creator
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if 'EXIF:Copyright' in exif_data:
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key_fields.append(exif_data['EXIF:Copyright'])
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if 'XMP:Creator' in exif_data:
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key_fields.append(exif_data['XMP:Creator'])
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if 'EXIF:Artist' in exif_data:
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key_fields.append(exif_data['EXIF:Artist'])
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return {
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'exif_text': ' '.join(str(f) for f in key_fields),
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'camera_make': exif_data.get('EXIF:Make'),
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'camera_model': exif_data.get('EXIF:Model'),
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'lens_model': exif_data.get('EXIF:LensModel'),
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'gps_latitude': lat,
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'gps_longitude': lon,
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}
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@shared_task(name='extract_metadata')
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def extract_metadata(photo_id: str):
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"""Extract metadata from a photo using ExifTool"""
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return asyncio.run(_extract_metadata_async(photo_id))
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async def _extract_metadata_async(photo_id: str):
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"""Async implementation of metadata extraction"""
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async with AsyncSessionLocal() as session:
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try:
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# Get photo from database
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result = await session.execute(
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select(Photo).where(Photo.id == photo_id)
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)
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photo = result.scalar_one_or_none()
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if not photo:
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logger.error(f"Photo not found: {photo_id}")
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return {'status': 'error', 'message': 'Photo not found'}
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# Check if file exists
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if not Path(photo.filepath).exists():
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logger.error(f"File not found: {photo.filepath}")
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return {'status': 'error', 'message': 'File not found'}
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# Run ExifTool to extract metadata
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cmd = [
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'exiftool',
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'-j', # JSON output
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'-G', # Group names
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'-s', # Short output format
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'-All', # All metadata
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photo.filepath
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]
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try:
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result = subprocess.run(
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cmd,
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capture_output=True,
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text=True,
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timeout=30
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)
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if result.returncode != 0:
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logger.error(f"ExifTool error: {result.stderr}")
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return {'status': 'error', 'message': result.stderr}
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# Parse JSON output
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metadata = json.loads(result.stdout)
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if metadata and len(metadata) > 0:
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exif_data = metadata[0]
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# Store full metadata as JSON
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photo.exif_json = json.dumps(exif_data)
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# Extract taken_at date
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date_fields = [
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'EXIF:DateTimeOriginal',
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'EXIF:CreateDate',
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'QuickTime:MediaCreateDate',
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'EXIF:ModifyDate'
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]
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for field in date_fields:
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if field in exif_data:
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taken_at = parse_exif_datetime(exif_data[field])
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if taken_at:
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photo.taken_at = taken_at
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photo.taken_at_source = 'exif'
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break
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# Extract dimensions if not already set
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if not photo.width:
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photo.width = exif_data.get('EXIF:ImageWidth') or exif_data.get('File:ImageWidth')
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if not photo.height:
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photo.height = exif_data.get('EXIF:ImageHeight') or exif_data.get('File:ImageHeight')
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# Extract GPS coordinates into first-class columns so the
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# Map view can query them without parsing exif_json.
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lat, lon = extract_gps(exif_data)
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photo.latitude = lat
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photo.longitude = lon
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# Extract and store key metadata for search
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key_metadata = extract_key_metadata(exif_data)
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# Update FTS table (would be done via trigger in production)
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# For now, we'll store it in a comment
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await session.commit()
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logger.info(f"Metadata extracted for photo {photo_id}")
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return {
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'status': 'success',
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'photo_id': photo_id,
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'taken_at': photo.taken_at.isoformat() if photo.taken_at else None
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}
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except subprocess.TimeoutExpired:
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logger.error(f"ExifTool timeout for {photo.filepath}")
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return {'status': 'error', 'message': 'ExifTool timeout'}
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except json.JSONDecodeError as e:
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logger.error(f"Failed to parse ExifTool output: {e}")
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return {'status': 'error', 'message': 'Invalid ExifTool output'}
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except Exception as e:
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logger.error(f"Error extracting metadata for {photo_id}: {e}")
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return {'status': 'error', 'message': str(e)} |