django-mdeditor支持七牛云存储图片

由于django-mdeditor官方插件没有支持第三方存储，所以，我们只能进行修改源码的方式实现了。

本次改写即使替换了其文件，不使用七牛云也是无关紧要的，因为在存储时，去settings.py中判断是否启用七牛云存储，只有配置了七牛云相关信息才会执行，否则还是原先的方式存储在本地。

源文件路径venv\Lib\site-packages\mdeditor\views.py

使用方法

• 修改源文件
  
  源文件路径venv\Lib\site-packages\mdeditor\views.py 找到该文件，将下面的代码直接复制全文替换

# -*- coding:utf-8 -*-
import os
import datetime

from django.views import generic
from django.conf import settings
from django.http import JsonResponse
from django.views.decorators.csrf import csrf_exempt
from django.utils.decorators import method_decorator
from .configs import MDConfig

# TODO 此处获取default配置，当用户设置了其他配置时，此处无效，需要进一步完善
MDEDITOR_CONFIGS = MDConfig('default')

class UploadView(generic.View):
    """ upload image file """

    @method_decorator(csrf_exempt)
    def dispatch(self, *args, **kwargs):
        return super(UploadView, self).dispatch(*args, **kwargs)

    def post(self, request, *args, **kwargs):
        upload_image = request.FILES.get("editormd-image-file", None)
        media_root = settings.MEDIA_ROOT

        # image none check
        if not upload_image:
            return JsonResponse({
                'success': 0,
                'message': "未获取到要上传的图片",
                'url': ""
            })

        # image format check
        file_name_list = upload_image.name.split('.')
        file_extension = file_name_list.pop(-1)
        file_name = '.'.join(file_name_list)
        if file_extension not in MDEDITOR_CONFIGS['upload_image_formats']:
            return JsonResponse({
                'success': 0,
                'message': "上传图片格式错误，允许上传图片格式为：%s" % ','.join(
                    MDEDITOR_CONFIGS['upload_image_formats']),
                'url': ""
            })

        # image floder check
        file_path = os.path.join(media_root, MDEDITOR_CONFIGS['image_folder'])
        if not os.path.exists(file_path):
            try:
                os.makedirs(file_path)
            except Exception as err:
                return JsonResponse({
                    'success': 0,
                    'message': "上传失败：%s" % str(err),
                    'url': ""
                })

        # save image
        try:
            use_qiniu = settings.MDEDITOR_USE_QINIU
            if use_qiniu:
                import qiniu,shortuuid
                from qiniu.http import ResponseInfo
                from urllib import parse
                qiniu_save = QiniuSave()
                save_name,url = qiniu_save.save(file_extension,upload_image)
                qiniu_save.dealwith_img(save_name)
                qiniu_save.cdn_flush(save_name)
            else:
                url = save_img_local(file_name, file_path, upload_image, file_extension)
        except AttributeError:
            url = save_img_local(file_name, file_path, upload_image, file_extension)

        return JsonResponse({'success': 1,
                             'message': "上传成功！",
                             'url': url})

    def save_img_local(self, file_name, file_path, upload_image, file_extension):
        '''将文件存储到本地'''
        file_full_name = '%s_%s.%s' % (file_name, '{0:%Y%m%d%H%M%S%f}'.format(datetime.datetime.now()),
                                       file_extension)
        with open(os.path.join(file_path, file_full_name), 'wb+') as file:
            for chunk in upload_image.chunks():
                file.write(chunk)
        url = os.path.join(settings.MEDIA_URL, MDEDITOR_CONFIGS['image_folder'], file_full_name)
        return url

class QiniuSave():
    def __init__(
            self,
            access_key=settings.QINIU_ACCESS_KEY,
            secret_key=settings.QINIU_SECRET_KEY,
            bucket_name=settings.QINIU_BUCKET_NAME,
            bucket_domain=settings.QINIU_BUCKET_DOMAIN,
            ):
        self.auth = qiniu.Auth(access_key, secret_key)
        self.bucket_name = bucket_name
        self.bucket_domain = bucket_domain
        self.bucket_manager = qiniu.BucketManager(self.auth)

    def re_name(self,file_extension):
        name = shortuuid.uuid() +'.'+ file_extension
        return name

    def save(self, file_extension, content):

        if hasattr(content, 'chunks'):
            content_str = b''.join(chunk for chunk in content.chunks())
        else:
            content_str = content.read()
        name = self.re_name(file_extension)
        self._put_file(name, content_str)
        url = parse.urljoin(self.bucket_domain, name)
        return name,url

    def _put_file(self, name, content):
        token = self.auth.upload_token(self.bucket_name)
        ret, info = qiniu.put_data(token, name, content)
        if ret is None or ret['key'] != name:
            raise QiniuError(info)

    # 将上传处理后的图片刷新到cdn节点，减少回源流量
    def cdn_flush(self,key):
        cdn_manager = qiniu.CdnManager(self.auth)
        domine = self.bucket_name
        need_flush_url = domine + key
        # 需要刷新的文件链接
        urls = [
            need_flush_url,
        ]
        # URL刷新链接
        refresh_url_result = cdn_manager.refresh_urls(urls)
        return

    # 进行上传的图片处理
    def dealwith_img(self,key):
        q = self.auth
        bucket_name = self.bucket_name
        # pipeline是使用的队列名称,不设置代表不使用私有队列，使用公有队列。
        # pipeline = 'your_pipeline'
        # 要进行的转换格式操作。
        # fops = 'imageView2/0/format/webp/interlace/1'
        fops = 'imageMogr2/format/webp'
        # 可以对缩略后的文件进行使用saveas参数自定义命名，当然也可以不指定文件会默认命名并保存在当前空间
        saveas_key = qiniu.urlsafe_base64_encode(bucket_name + ':' + key)
        fops = fops + '|saveas/' + saveas_key
        # pfop = qiniu.PersistentFop(q, bucket_name, pipeline)
        pfop = qiniu.PersistentFop(q, bucket_name)
        ops = []
        ops.append(fops)
        ret, info = pfop.execute(key, ops, 1)
        assert ret['persistentId'] is not None
        return

class QiniuError(IOError):

    def __init__(self, value):
        if isinstance("Debuf Info", ResponseInfo):
            super(QiniuError, self).__init__(
                "Qiniu Response Info %s" % value
            )
        else:
            super(QiniuError, self).__init__(value)

• 在django的settings.py中配置

# mdeitor配置
MDEDITOR_USE_QINIU = True
# qiniuyun

QINIU_ACCESS_KEY = '七牛云账号的access_key'
QINIU_SECRET_KEY = '七牛云账号的secret_key'
QINIU_BUCKET_NAME = '七牛云的空间名称'
QINIU_BUCKET_DOMAIN = '七牛云空间绑定的自定义的cdn加速域名，格式：http://example.com或者：https://example.com'