from django.urls import path,re_path
from .views import HomeView,DisplayView,MyView,SearchView
from . import views

app_name = 'share'
urlpatterns = [
    path('', HomeView.as_view(), name='home'),
    # 當(dāng)用戶發(fā)起主頁的GET請求時
    # 會調(diào)用 HomeView的父類的get方法處理
    # 怎么調(diào)用呢，這里需要用到HomeView的父類的as_view方法
    # 此方法會調(diào)用dispatch方法, 由后者根據(jù)請求類型選擇響應(yīng)的處理函數(shù)
    path('s/<code>', DisplayView.as_view(), name='display'),   #展示上傳成功的文件
    path('my/', MyView.as_view(), name='my'),            #管理文件
    path('search/', SearchView.as_view(), name='search'),    #搜索文件
    re_path(r'^download/(?P<id>\d*$)', views.Download, name='download'),   #下載文件
    re_path(r'^delete/(?P<id>\d*$)', views.DeleteFile, name='delete'),  #刪除文件

]

from django.shortcuts import render
from django.views.generic import TemplateView,ListView
import random
import string
import json
from django.http import HttpResponse,HttpResponsePermanentRedirect,StreamingHttpResponse,HttpResponseRedirect
from .models import Upload
import os
# 創(chuàng)建視圖類需要基礎(chǔ)視圖基類
# 例如 TemplateView 就是用于展示頁面的模板視圖基類
# 該類僅提供get方法，用于處理GET請求
# 當(dāng)然也可以自定義其他方法，例如post
# 展示主頁的話，只需要提供模板文件的名字即可
# 當(dāng)客戶端發(fā)起get請求時，由父類的get方法處理請求
# 該屬性用于提供模板文件，在父類的方法中被調(diào)用
class HomeView(TemplateView):
    '''用來展示主頁的視圖類
    '''
    template_name = "base.html"
    def post(self, request):
        if request.FILES:    #如果表單中有文件
            file = request.FILES.get('file')
            code = ''.join(random.sample(string.digits, 8))     #設(shè)置文件的唯一標(biāo)識code,并且用作文件改名
            name = file.name
            size = int(file.size)
            path = 'filesystem/static/file/' + code + name   #設(shè)置文件保存的路徑，并且更改文件名（防止重名文件）
            with open(path, 'wb') as f:
                f.write(file.read())      #保存文件

            upload = Upload(
                path = path,
                name = name,
                filesize = size,
                code = code,
                pcip = str(request.META['REMOTE_ADDR'])
            )
            upload.save()   #向數(shù)據(jù)庫插入數(shù)據(jù)
            return HttpResponsePermanentRedirect("/share/s/"+code)    #重定向到DisplayView

class DisplayView(ListView):
    '''展示文件的視圖類
    '''
    def get(self, request, code):
        uploads = Upload.objects.filter(code=code)     #顯示出指定文件
        if uploads:
            for upload in uploads:
                upload.dowmloadcount += 1   #記錄訪問次數(shù)
                upload.save()
        return render(request, 'content.html', {'content':uploads, 'host':request.get_host()})

class MyView(ListView):
    '''
    用戶管理視圖類，就是用戶管理文件的那個頁面的視圖類
    '''
    def get(self, request):
        #ip = request.META['REMOTE_ADDR']
        #uploads = Upload.objects.filter(pcip=ip)  
        uploads = Upload.objects.all()     #查詢所有文件
        for upload in uploads:
            upload.dowmloadcount += 1
            upload.save()
        return render(request, 'content.html', {'content':uploads})   #將所有文件信息渲染展示

class SearchView(ListView):
    '''搜索功能的視圖類
    '''
    def get(self, request):
        code = request.GET.get('kw')   # 獲取關(guān)鍵詞
        u = Upload.objects.filter(name__icontains=str(code))    # 模糊搜索
        # select * from share_upload where name like '%code%';
        data = {}
        if u:
            # 將符合條件的數(shù)據(jù)放到data中
            for i in range(len(u)):           # 循環(huán)輸出查詢的結(jié)果
                u[i].dowmloadcount += 1
                u[i].save()
                data[i]={}
                data[i]['download'] = u[i].dowmloadcount
                data[i]['filename'] = u[i].name
                data[i]['id'] = u[i].id
                data[i]['ip'] = str(u[i].pcip)
                data[i]['size'] = u[i].filesize
                data[i]['time'] = str(u[i].datetime.strftime('%Y-%m-%d %H:%M'))

        return HttpResponse(json.dumps(data), content_type="application/json")


def Download(request, id):
    """
    下載壓縮文件
    :param request:
    :param id: 數(shù)據(jù)庫id
    :return:
    """
    data = Upload.objects.all()
    file_name = ""  # 文件名
    for i in data:
        if i.code == id:  # 判斷id一致時
            file_name = i.name  # 覆蓋變量

    base_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))  # 項目根目錄
    file_path = os.path.join(base_dir, 'filesystem', 'static', 'file', file_name)  # 下載文件的絕對路徑

    if not os.path.isfile(file_path):  # 判斷下載文件是否存在
        return HttpResponse("Sorry but Not Found the File")

    def file_iterator(file_path, chunk_size=512):
        """
        文件生成器,防止文件過大，導(dǎo)致內(nèi)存溢出
        :param file_path: 文件絕對路徑
        :param chunk_size: 塊大小
        :return: 生成器
        """
        with open(file_path, mode='rb') as f:
            while True:
                c = f.read(chunk_size)
                if c:
                    yield c
                else:
                    break

    try:
        # 設(shè)置響應(yīng)頭
        # StreamingHttpResponse將文件內(nèi)容進(jìn)行流式傳輸，數(shù)據(jù)量大可以用這個方法
        response = StreamingHttpResponse(file_iterator(file_path))
        # 以流的形式下載文件,這樣可以實現(xiàn)任意格式的文件下載
        response['Content-Type'] = 'application/octet-stream'
        # Content-Disposition就是當(dāng)用戶想把請求所得的內(nèi)容存為一個文件的時候提供一個默認(rèn)的文件名
        response['Content-Disposition'] = 'attachment;filename="{}"'.format(file_name)
        
    except:
        return HttpResponse("Sorry but Not Found the File")
    return response

def DeleteFile(request, id):
    '''刪除指定文件'''
    data = Upload.objects.all()
    file_name = ""  # 文件名
    for i in data:
        if i.code == id:  # 判斷id一致時
            file_name = i.code + i.name  # 覆蓋變量

    base_dir = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))  # 項目根目錄
    file_path = os.path.join(base_dir, 'filesystem', 'static', 'file', file_name)  # 下載文件的絕對路徑
    if os.path.exists(file_path):
        os.remove(file_path)
    file = Upload.objects.get(code=id)
    file.delete()
    return HttpResponseRedirect('/share/my/')

    '''
    except Exception as e:
        return http.HttpResponseForbidden('文件不存在，下載失??！')
        '''