|
|
|
|
@ -0,0 +1,182 @@
|
|
|
|
|
import re
|
|
|
|
|
import hashlib
|
|
|
|
|
from urllib.parse import urlparse
|
|
|
|
|
from djangoblog.plugin_manage.base_plugin import BasePlugin
|
|
|
|
|
from djangoblog.plugin_manage import hooks
|
|
|
|
|
from djangoblog.plugin_manage.hook_constants import ARTICLE_CONTENT_HOOK_NAME
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
class ImageOptimizationPlugin(BasePlugin):
|
|
|
|
|
PLUGIN_NAME = '图片性能优化插件'
|
|
|
|
|
PLUGIN_DESCRIPTION = '自动为文章中的图片添加懒加载、异步解码等性能优化属性，显著提升页面加载速度。'
|
|
|
|
|
PLUGIN_VERSION = '1.0.0'
|
|
|
|
|
PLUGIN_AUTHOR = 'liangliangyy'
|
|
|
|
|
|
|
|
|
|
def __init__(self):
|
|
|
|
|
# 插件配置
|
|
|
|
|
self.config = {
|
|
|
|
|
'enable_lazy_loading': True, # 启用懒加载
|
|
|
|
|
'enable_async_decoding': True, # 启用异步解码
|
|
|
|
|
'add_loading_placeholder': True, # 添加加载占位符
|
|
|
|
|
'optimize_external_images': True, # 优化外部图片
|
|
|
|
|
'add_responsive_attributes': True, # 添加响应式属性
|
|
|
|
|
'skip_first_image': True, # 跳过第一张图片（LCP优化）
|
|
|
|
|
}
|
|
|
|
|
super().__init__()
|
|
|
|
|
|
|
|
|
|
def register_hooks(self):
|
|
|
|
|
hooks.register(ARTICLE_CONTENT_HOOK_NAME, self.optimize_images)
|
|
|
|
|
|
|
|
|
|
def optimize_images(self, content, *args, **kwargs):
|
|
|
|
|
"""
|
|
|
|
|
优化文章中的图片标签
|
|
|
|
|
"""
|
|
|
|
|
if not content:
|
|
|
|
|
return content
|
|
|
|
|
|
|
|
|
|
# 正则表达式匹配 img 标签
|
|
|
|
|
img_pattern = re.compile(
|
|
|
|
|
r'<img\s+([^>]*?)(?:\s*/)?>',
|
|
|
|
|
re.IGNORECASE | re.DOTALL
|
|
|
|
|
)
|
|
|
|
|
|
|
|
|
|
image_count = 0
|
|
|
|
|
|
|
|
|
|
def replace_img_tag(match):
|
|
|
|
|
nonlocal image_count
|
|
|
|
|
image_count += 1
|
|
|
|
|
|
|
|
|
|
# 获取原始属性
|
|
|
|
|
original_attrs = match.group(1)
|
|
|
|
|
|
|
|
|
|
# 解析现有属性
|
|
|
|
|
attrs = self._parse_img_attributes(original_attrs)
|
|
|
|
|
|
|
|
|
|
# 应用优化
|
|
|
|
|
optimized_attrs = self._apply_optimizations(attrs, image_count)
|
|
|
|
|
|
|
|
|
|
# 重构 img 标签
|
|
|
|
|
return self._build_img_tag(optimized_attrs)
|
|
|
|
|
|
|
|
|
|
# 替换所有 img 标签
|
|
|
|
|
optimized_content = img_pattern.sub(replace_img_tag, content)
|
|
|
|
|
|
|
|
|
|
return optimized_content
|
|
|
|
|
|
|
|
|
|
def _parse_img_attributes(self, attr_string):
|
|
|
|
|
"""
|
|
|
|
|
解析 img 标签的属性
|
|
|
|
|
"""
|
|
|
|
|
attrs = {}
|
|
|
|
|
|
|
|
|
|
# 正则表达式匹配属性
|
|
|
|
|
attr_pattern = re.compile(r'(\w+)=(["\'])(.*?)\2')
|
|
|
|
|
|
|
|
|
|
for match in attr_pattern.finditer(attr_string):
|
|
|
|
|
attr_name = match.group(1).lower()
|
|
|
|
|
attr_value = match.group(3)
|
|
|
|
|
attrs[attr_name] = attr_value
|
|
|
|
|
|
|
|
|
|
return attrs
|
|
|
|
|
|
|
|
|
|
def _apply_optimizations(self, attrs, image_index):
|
|
|
|
|
"""
|
|
|
|
|
应用各种图片优化
|
|
|
|
|
"""
|
|
|
|
|
# 1. 懒加载优化（跳过第一张图片以优化LCP）
|
|
|
|
|
if self.config['enable_lazy_loading']:
|
|
|
|
|
if not (self.config['skip_first_image'] and image_index == 1):
|
|
|
|
|
if 'loading' not in attrs:
|
|
|
|
|
attrs['loading'] = 'lazy'
|
|
|
|
|
|
|
|
|
|
# 2. 异步解码
|
|
|
|
|
if self.config['enable_async_decoding']:
|
|
|
|
|
if 'decoding' not in attrs:
|
|
|
|
|
attrs['decoding'] = 'async'
|
|
|
|
|
|
|
|
|
|
# 3. 添加样式优化
|
|
|
|
|
current_style = attrs.get('style', '')
|
|
|
|
|
|
|
|
|
|
# 确保图片不会超出容器
|
|
|
|
|
if 'max-width' not in current_style:
|
|
|
|
|
if current_style and not current_style.endswith(';'):
|
|
|
|
|
current_style += ';'
|
|
|
|
|
current_style += 'max-width:100%;height:auto;'
|
|
|
|
|
attrs['style'] = current_style
|
|
|
|
|
|
|
|
|
|
# 4. 添加 alt 属性（SEO和可访问性）
|
|
|
|
|
if 'alt' not in attrs:
|
|
|
|
|
# 尝试从图片URL生成有意义的alt文本
|
|
|
|
|
src = attrs.get('src', '')
|
|
|
|
|
if src:
|
|
|
|
|
# 从文件名生成alt文本
|
|
|
|
|
filename = src.split('/')[-1].split('.')[0]
|
|
|
|
|
# 移除常见的无意义字符
|
|
|
|
|
clean_name = re.sub(r'[0-9a-f]{8,}', '', filename) # 移除长hash
|
|
|
|
|
clean_name = re.sub(r'[_-]+', ' ', clean_name).strip()
|
|
|
|
|
attrs['alt'] = clean_name if clean_name else '文章图片'
|
|
|
|
|
else:
|
|
|
|
|
attrs['alt'] = '文章图片'
|
|
|
|
|
|
|
|
|
|
# 5. 外部图片优化
|
|
|
|
|
if self.config['optimize_external_images'] and 'src' in attrs:
|
|
|
|
|
src = attrs['src']
|
|
|
|
|
parsed_url = urlparse(src)
|
|
|
|
|
|
|
|
|
|
# 如果是外部图片，添加 referrerpolicy
|
|
|
|
|
if parsed_url.netloc and parsed_url.netloc != self._get_current_domain():
|
|
|
|
|
attrs['referrerpolicy'] = 'no-referrer-when-downgrade'
|
|
|
|
|
# 为外部图片添加crossorigin属性以支持性能监控
|
|
|
|
|
if 'crossorigin' not in attrs:
|
|
|
|
|
attrs['crossorigin'] = 'anonymous'
|
|
|
|
|
|
|
|
|
|
# 6. 响应式图片属性（如果配置启用）
|
|
|
|
|
if self.config['add_responsive_attributes']:
|
|
|
|
|
# 添加 sizes 属性（如果没有的话）
|
|
|
|
|
if 'sizes' not in attrs and 'srcset' not in attrs:
|
|
|
|
|
attrs['sizes'] = '(max-width: 768px) 100vw, (max-width: 1024px) 50vw, 33vw'
|
|
|
|
|
|
|
|
|
|
# 7. 添加图片唯一标识符用于性能追踪
|
|
|
|
|
if 'data-img-id' not in attrs and 'src' in attrs:
|
|
|
|
|
img_hash = hashlib.md5(attrs['src'].encode()).hexdigest()[:8]
|
|
|
|
|
attrs['data-img-id'] = f'img-{img_hash}'
|
|
|
|
|
|
|
|
|
|
# 8. 为第一张图片添加高优先级提示（LCP优化）
|
|
|
|
|
if image_index == 1 and self.config['skip_first_image']:
|
|
|
|
|
attrs['fetchpriority'] = 'high'
|
|
|
|
|
# 移除懒加载以确保快速加载
|
|
|
|
|
if 'loading' in attrs:
|
|
|
|
|
del attrs['loading']
|
|
|
|
|
|
|
|
|
|
return attrs
|
|
|
|
|
|
|
|
|
|
def _build_img_tag(self, attrs):
|
|
|
|
|
"""
|
|
|
|
|
重新构建 img 标签
|
|
|
|
|
"""
|
|
|
|
|
attr_strings = []
|
|
|
|
|
|
|
|
|
|
# 确保 src 属性在最前面
|
|
|
|
|
if 'src' in attrs:
|
|
|
|
|
attr_strings.append(f'src="{attrs["src"]}"')
|
|
|
|
|
|
|
|
|
|
# 添加其他属性
|
|
|
|
|
for key, value in attrs.items():
|
|
|
|
|
if key != 'src': # src 已经添加过了
|
|
|
|
|
attr_strings.append(f'{key}="{value}"')
|
|
|
|
|
|
|
|
|
|
return f'<img {" ".join(attr_strings)}>'
|
|
|
|
|
|
|
|
|
|
def _get_current_domain(self):
|
|
|
|
|
"""
|
|
|
|
|
获取当前网站域名
|
|
|
|
|
"""
|
|
|
|
|
try:
|
|
|
|
|
from djangoblog.utils import get_current_site
|
|
|
|
|
return get_current_site().domain
|
|
|
|
|
except:
|
|
|
|
|
return ''
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
# 实例化插件
|
|
|
|
|
plugin = ImageOptimizationPlugin()
|
liangliangyy
5 months ago