pai2/utils/storage_utils.py

# -*- coding: utf-8 -*-

import os

import shortuuid
from django.conf import settings
from django.core.files.storage import default_storage
from django.db import transaction
from filemd5 import calculate_md5

from photo.models import PhotoUUIDInfo
from utils.thumbnail_utils import make_thumbnail
from utils.watermark_utils import watermark_wrap


class DotDict(dict):
    """ dot.notation access to dictionary attributes """
    def __getattr__(self, attr):
        return self.get(attr)
    __setattr__ = dict.__setitem__
    __delattr__ = dict.__delitem__


@transaction.atomic
def file_save(photo=None, photo_path=None, prefix='img', ext='jpeg', watermark=False, thumbnail=False):
    # Photo
    photo = photo or default_storage.open(photo_path)

    # Ext
    ext = os.path.splitext(photo.name)[-1] or ext

    photo, created = PhotoUUIDInfo.objects.select_for_update().get_or_create(photo_md5=calculate_md5(photo))

    # 照片路径
    photo_path = photo.photo_path
    if not photo_path:
        photo_path = '{}/{}{}'.format(prefix, shortuuid.uuid(), ext)
        if default_storage.exists(photo_path):
            default_storage.delete(photo_path)
        default_storage.save(photo_path, photo)

        photo.photo_path = photo_path
        photo.save()

    # 水印
    if watermark:
        if not photo.photo_watermark_path:
            photo_watermark_path = 'photo/{}{}'.format(shortuuid.uuid(), ext)
            watermark_wrap(
                os.path.join(settings.MEDIA_ROOT, photo_path).replace('\\', '/'),
                settings.WATERMARK_LOGO,
                os.path.join(settings.MEDIA_ROOT, photo_watermark_path).replace('\\', '/')
            )
            photo.photo_watermark_path
            photo.save()

    # 缩略图
    if thumbnail:
        if not photo.photo_thumbnail_path:
            # 双列: 540, 40-50K
            photo_thumbnail_path = photo_path.replace('.', '_thumbnail.')
            photo_w, photo_h, photo_thumbnail_w, photo_thumbnail_h = make_thumbnail(
                os.path.join(settings.MEDIA_ROOT, photo_path).replace('\\', '/'),
                os.path.join(settings.MEDIA_ROOT, photo_thumbnail_path).replace('\\', '/'),
                settings.THUMBNAIL_MAX_WIDTH
            )
            photo.photo_w = photo_w
            photo.photo_h = photo_h
            photo.photo_thumbnail_path = photo_thumbnail_path
            photo.photo_thumbnail_w = photo_thumbnail_w
            photo.photo_thumbnail_h = photo_thumbnail_h
        if not photo.photo_thumbnail2_path:
            # 单列: 1080, xx-100K
            photo_thumbnail2_path = photo_path.replace('.', '_thumbnail2.')
            photo_w, photo_h, photo_thumbnail2_w, photo_thumbnail2_h = make_thumbnail(
                os.path.join(settings.MEDIA_ROOT, photo_path).replace('\\', '/'),
                os.path.join(settings.MEDIA_ROOT, photo_thumbnail2_path).replace('\\', '/'),
                settings.THUMBNAIL_MAX_WIDTH2
            )
            photo.photo_w = photo_w
            photo.photo_h = photo_h
            photo.photo_thumbnail2_path = photo_thumbnail2_path
            photo.photo_thumbnail2_w = photo_thumbnail2_w
            photo.photo_thumbnail2_h = photo_thumbnail2_h
        photo.save()

    return DotDict({
        'ext': ext,

        'photo_path': photo_path,
        'photo_w': photo.photo_w,
        'photo_h': photo.photo_h,

        'photo_watermark_path': photo.photo_watermark_path,

        'photo_thumbnail_path': photo.photo_thumbnail_path,
        'photo_thumbnail_w': photo.photo_thumbnail_w,
        'photo_thumbnail_h': photo.photo_thumbnail_h,

        'photo_thumbnail2_path': photo.photo_thumbnail2_path,
        'photo_thumbnail2_w': photo.photo_thumbnail2_w,
        'photo_thumbnail2_h': photo.photo_thumbnail2_h,
    })