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Python development [Django]: combined search, JSONP, XSS filtering

高洛峰

Feb 22, 2017 am 10:37 AM

python development

1. Simple implementation

Associated files:

from django.conf.urls import url
from . import views

urlpatterns = [
    url(r'^index.html/$',views.index),
    url(r'^article/(?P<article_type>\d+)-(?P<category>\d+).html/$',views.article)
]

url.py</category></article_type>

nbsp;html>


    <meta>
    <title>Title</title>
    <style>
        .condition a{
            display:inline-block;
            padding: 3px 5px;
            border: 1px solid black;
        }
        .condition a.active{
            background-color: brown;
        }
    </style>


    <h2 id="过滤条件">过滤条件</h2>


    <div>
        {% if kwargs.article_type == 0 %}
            <a>全部</a>
        {% else %}
            <a>全部</a>
        {% endif %}

        {% for row in article_type %}
            {% if row.id == kwargs.article_type %}
                <a>{{ row.caption }}</a>
            {% else %}
                <a>{{ row.caption }}</a>
            {% endif %}
        {% endfor %}
    </div>

    <div>
        {% if kwargs.category == 0 %}
            <a>全部</a>
        {% else %}
            <a>全部</a>
        {% endif %}

        {% for row in category %}
            {% if row.id == kwargs.category %}
                <a>{{ row.caption }}</a>
            {% else %}
                <a>{{ row.caption }}</a>
            {% endif %}
        {% endfor %}
    </div>

    <h2 id="查询结果">查询结果</h2>

{{ row.id }}-{{ row.title }}------[{{ row.article_type.caption }}]-[{{ row.category.caption }}]

article.html

Database structure:

from django.db import models
 
# Create your models here.
 
class Categoery(models.Model):
    caption = models.CharField(max_length=16)
 
class ArticleType(models.Model):
    caption = models.CharField(max_length=16)
 
class Article(models.Model):
 
    title = models.CharField(max_length=32)
    content = models.CharField(max_length=255)
 
    category = models.ForeignKey(Categoery)
    article_type = models.ForeignKey(ArticleType)

Processing files:

from . import  models
def article(request,*args,**kwargs):
 
    search_dict = {}
    for key,value in kwargs.items():
        kwargs[key] = int(value)        # 把字符类型转化为int类型 方便前端做if a == b  这样的比较
        if value !='0':
            search_dict[key] = value
    articles = models.Article.objects.filter(**search_dict) # 字典为空时表示搜索所有
 
    article_type = models.ArticleType.objects.all()
    category = models.Categoery.objects.all()
 
    return render(request,'article.html',{'articles':articles,
                                          'article_type':article_type,
                                         'category':category ,
                                          'kwargs':kwargs})

Note: It is not necessary to implement this function Difficult, the most important thing is to clarify the ideas inside; first, determine the url access path format http://127.0.0.1:8000/article/0-0.html, the first 0 represents the article_type field, and the second 0 Indicates the category field. If it is zero, it means searching for all information in this field. Confirming this is the first step to success. There is retrieval processing on the processing file; the second key point is to generate a dictionary search_dict for related searches. If If it is 0, it means searching all; the third key point is also a very clever way, passing the parameter kwargs to the front end again, it is a stroke of genius!

2. Another attempt (loading memory tuning)

Since the ArticleType type is fixed data for the blog, it will not be changed later, so you can load the data into the memory to speed up the query

nbsp;html>


    <meta>
    <title>Title</title>
    <style>
        .condition a{
            display:inline-block;
            padding: 3px 5px;
            border: 1px solid black;
        }
        .condition a.active{
            background-color: brown;
        }
    </style>


    <h2 id="过滤条件">过滤条件</h2>

    <div>
        {% if kwargs.article_type_id == 0 %}
            <a>全部</a>
        {% else %}
            <a>全部</a>
        {% endif %}

        {% for row in article_type%}
            {% if row.0 == kwargs.article_type_id %}
                <a>{{ row.1 }}</a>
            {% else %}
                <a>{{ row.1 }}</a>
            {% endif %}
        {% endfor %}
    </div>

    <div>
        {% if kwargs.category_id == 0 %}
            <a>全部</a>
        {% else %}
            <a>全部</a>
        {% endif %}

        {% for row in category %}
            {% if row.id == kwargs.category_id %}
                <a>{{ row.caption }}</a>
            {% else %}
                <a>{{ row.caption }}</a>
            {% endif %}
        {% endfor %}
    </div>

    <h2 id="查询结果">查询结果</h2>

{{ row.id }}-{{ row.title }}------[{{ row.article_type }}]-[{{ row.category.caption }}]

article.html

from django.shortcuts import render
from django.shortcuts import HttpResponse

# Create your views here.

def index(request):


    return HttpResponse('Ok')


from . import  models
def article(request,*args,**kwargs):

    search_dict = {}
    for key,value in kwargs.items():
        kwargs[key] = int(value)        # 把字符类型转化为int类型 方便前端做if a == b  这样的比较
        if value !='0':
            search_dict[key] = value
    print(kwargs)
    articles = models.Article.objects.filter(**search_dict) # 字典为空时表示搜索所有

    article_type = models.Article.type_choice

    print(article_type)
    category = models.Categoery.objects.all()

    return render(request,'article.html',{'articles':articles,
                                          'article_type':article_type,
                                         'category':category ,
                                          'kwargs':kwargs})

处理文件.py

Database file:

from django.db import models
# Create your models here.
class Categoery(models.Model):
    caption = models.CharField(max_length=16)
 
# class ArticleType(models.Model):
#     caption = models.CharField(max_length=16)
 
class Article(models.Model):
    title = models.CharField(max_length=32)
    content = models.CharField(max_length=255)
 
    category = models.ForeignKey(Categoery)
    # article_type = models.ForeignKey(ArticleType)
    type_choice  = [
        (1,'Python'),
        (2,'Linux'),
        (3,'大数据'),
        (4,'架构'),
    ]
    article_type_id = models.IntegerField(choices=type_choice)

3. Use simple_tag to optimize the code

Associated files:

from django.db import models
# Create your models here.
class Categoery(models.Model):
    caption = models.CharField(max_length=16)

class ArticleType(models.Model):
    caption = models.CharField(max_length=16)

class Article(models.Model):
    title = models.CharField(max_length=32)
    content = models.CharField(max_length=255)

    category = models.ForeignKey(Categoery)
    article_type = models.ForeignKey(ArticleType)
    # type_choice  = [
    #     (1,'Python'),
    #     (2,'Linux'),
    #     (3,'大数据'),
    #     (4,'架构'),
    # ]
    # article_type_id = models.IntegerField(choices=type_choice)

数据库文件.py

from django.shortcuts import render
from django.shortcuts import HttpResponse

# Create your views here.

def index(request):


    return HttpResponse('Ok')


from . import models
def article(request, *args, **kwargs):
    search_dict = {}
    for key, value in kwargs.items():
        kwargs[key] = int(value)  # 把字符类型转化为int类型 方便前端做if a == b  这样的比较
        if value != '0':
            search_dict[key] = value
    articles = models.Article.objects.filter(**search_dict)  # 字典为空时表示搜索所有

    article_type = models.ArticleType.objects.all()

    print(article_type)
    category = models.Categoery.objects.all()


    return render(request, 'article.html', {'articles': articles,
                                            'article_type': article_type,
                                            'category': category,
                                            'kwargs': kwargs})

处理文件.py

{% load filter %}
nbsp;html>


    <meta>
    <title>Title</title>
    <style>
        .condition a{
            display:inline-block;
            padding: 3px 5px;
            border: 1px solid black;
        }
        .condition a.active{
            background-color: brown;
        }
    </style>


    <h2 id="过滤条件">过滤条件</h2>
    <div>
        {% filter_all  kwargs 'article_type'%}

        {% filter_single article_type kwargs 'article_type'%}
    </div>
    <div>
        {% filter_all  kwargs 'category'%}
        {% filter_single category kwargs 'category'%}
    </div>

    <h2 id="查询结果">查询结果</h2>

{{ row.id }}-{{ row.title }}------[{{ row.article_type.caption }}]-[{{ row.category.caption }}]

article.html

Create templatetags directory , create the filter.py file in the directory:

from django import template
from django.utils.safestring import mark_safe
register = template.Library()
 
@register.simple_tag
def filter_all(kwargs,type_str):
    print(type_str)
    if type_str == 'article_type':
        if kwargs['article_type'] == 0:
            tmp = '<a> 全部 </a>'%(kwargs['category'])
        else:
            tmp = '<a> 全部 </a>'%(kwargs['category'])
 
    elif type_str == 'category':
        if kwargs['category'] == 0:
            tmp = '<a> 全部 </a>' % (kwargs['article_type'])
        else:
            tmp = '<a> 全部 </a>' % (kwargs['article_type'])
 
    return mark_safe(tmp)
 
@register.simple_tag()
def filter_single(type_obj,kwargs,type_str):
 
    print(type_str)
    tmp = ''
    if type_str == 'article_type':
        for row in type_obj:
            if row.id == kwargs['article_type']:
                tag = '<a>%s</a>\n'%(row.id,kwargs['category'],row.caption)
            else:
                tag = '<a>%s</a>\n' % (row.id, kwargs['category'],row.caption)
            tmp +=tag
    elif type_str == 'category':
        for row in type_obj:
            if row.id == kwargs['category']:
                tag = '<a>%s</a>\n' % (kwargs['article_type'],row.id, row.caption)
            else:
                tag = '<a>%s</a>\n' % (kwargs['article_type'], row.id, row.caption)
            tmp += tag
 
    return mark_safe(tmp)

HTML file main content:

{% load filter %}

    <h2 id="过滤条件">过滤条件</h2>
    <div>
        {% filter_all  kwargs 'article_type'%}
 
        {% filter_single article_type kwargs 'article_type'%}
    </div>
    <div>
        {% filter_all  kwargs 'category'%}
        {% filter_single category kwargs 'category'%}
    </div>
 
    <h2 id="查询结果">查询结果</h2>

{{ row.id }}-{{ row.title }}------[{{ row.article_type.caption }}]-[{{ row.category.caption }}]

JSONP

JSONP (JSON with Padding) is a "usage mode" of JSON ”, which can be used to solve the problem of cross-domain data access by mainstream browsers. Due to the same-origin policy, generally speaking, web pages located at server1.example.com cannot communicate with servers other than server1.example.com, with the exception of the HTML <script> element. Using this open policy of the <script> element, web pages can obtain JSON data dynamically generated from other sources, and this usage pattern is called JSONP. The data captured with JSONP is not JSON, but arbitrary JavaScript, which is executed with a JavaScript interpreter instead of parsed with a JSON parser. </script>

Principle:

- Create script tag

- src=remote address

-The returned data must be in js format

- Only GET requests can be sent

1. What is the same origin policy?

Processing file:

import requests
def jsonp(request):
    # 获取url信息
    response = requests.get(&#39;http://weatherapi.market.xiaomi.com/wtr-v2/weather?cityId=101121301&#39;)
    response.encoding = &#39;utf-8&#39;     # 进行编码
 
    return render(request,&#39;jsonp.html&#39;,{&#39;result&#39;:response.text})  # response.text 请求内容

HTML file:

<body>
    <h1 id="后台获取的结果">后台获取的结果</h1>
    {{ result }}
    <h1 id="js直接获取结果">js直接获取结果</h1>
    <input type="button" value="获取数据" onclick="getContent();" />
    <div id="container"></div>
    <script src="/static/jquery-1.8.2.js"></script>
    <script>
        function getContent() {
            var xhr = new XMLHttpRequest();         // 创建对象
            xhr.open(&#39;GET&#39;, &#39;http://weatherapi.market.xiaomi.com/wtr-v2/weather?cityId=101121301&#39;); // GET方式打开
            xhr.onreadystatechange = function () {　　// 收到返回值时执行
                console.log(xhr.responseText);
            };
            xhr.send()　　// 发送
        }
    </script>
</body>

Note: When clicking js to directly obtain the results, the browser displays the following error message because the browser only accepts http:/ The information sent by /127.0.0.1:8000 is directly blocked for the information sent by the weather website. This is the same-origin policy. Is there any way to solve it?

XMLHttpRequest cannot load http://weatherapi.market.xiaomi.com/wtr-v2/weather?cityId=101121301. No &#39;Access-Control-Allow-Origin&#39; header is present on the requested resource. Origin &#39;http://127.0.0.1:8000&#39; is therefore not allowed access.

2. Cleverly use the src attribute of the script tag

The script tag is not affected by the same-origin policy

Processing files:

import requests
def jsonp(request):
    # 获取url信息
    response = requests.get(&#39;http://weatherapi.market.xiaomi.com/wtr-v2/weather?cityId=101121301&#39;)
    response.encoding = &#39;utf-8&#39;     # 进行编码
 
    return render(request,&#39;jsonp.html&#39;,{&#39;result&#39;:response.text})  # response.text 请求内容
 
def jsonp_api(request):
    return HttpResponse('alert(123)')

HTML files:

<body>
    <h1 id="后台获取的结果">后台获取的结果</h1>
    {{ result }}
    <h1 id="js直接获取结果">js直接获取结果</h1>
    <input type="button" value="获取数据" onclick="getContent();" />
    <div id="container"></div>
    <script>
        function getContent() {
            var tag = document.createElement(&#39;script&#39;);
            tag.src = &#39;/jsonp_api.html&#39;;
            document.head.appendChild(tag);
         //   document.head.removeChild(tag);
        }
    </script>
</body>

Note: For convenience when making js requests, the current program URL is still requested; after executing the above code, you will find a magical situation , a 123 message will pop up on the page, indicating that the script successfully obtained the information

3. Slightly modify the front and back ends to make the usage more dynamic

Processing files:

def jsonp(request):
 
    return render(request,&#39;jsonp.html&#39;)  # response.text 请求内容
 
def jsonp_api(request):
    func = request.GET.get(&#39;callback&#39;)  # 获取用户callback参数
    content = &#39;%s(10000)&#39;%func          # 执行func（10000）函数
 
    return HttpResponse(content)

HTML file:

<body>
    <h1 id="后台获取的结果">后台获取的结果</h1>
    {{ result }}
    <h1 id="js直接获取结果">js直接获取结果</h1>
    <input type="button" value="获取数据" onclick="getContent();" />
    <div id="container"></div>
    <script>
        function getContent() {
            var tag = document.createElement(&#39;script&#39;);
            tag.src = &#39;/jsonp_api.html?callback=list&#39;;  // 自定义callback参数，与后台达成默契
            document.head.appendChild(tag);
         //   document.head.removeChild(tag);
        }
        function list(arg){         // 自定义函数与callback=list相对应
               alert(arg);
            }
    </script>
</body>

Note: When js sends a request, bring the callback parameter, and then define the method corresponding to the parameter. The background will pass the data into this method and execute it; as for printing or The pop-up box depends on the user's own needs; the principle and implementation process of jsonp is the implementation of the above code

4. Example application+ajax

processing files :

import requests
def jsonp(request):
    response = requests.get(&#39;http://www.jxntv.cn/data/jmd-jxtv2.html?callback=list&_=1454376870403&#39;)
    response.encoding = &#39;utf-8&#39;  # 进行编码
 
    return render(request, &#39;jsonp.html&#39;, {&#39;result&#39;: response.text})  # response.text 请求内容

HTML file:

<body>
    <h1 id="后台获取的结果">后台获取的结果</h1>
    {{ result }}
    <h1 id="js直接获取结果">js直接获取结果</h1>
    <input type="button" value="获取数据" onclick="getContent();" />
    <div id="container"></div>
    <script src="/static/jquery-1.8.2.js"></script>
    <script>
        function getContent() {
            $.ajax({
                url: &#39;http://www.jxntv.cn/data/jmd-jxtv2.html?callback=list&_=1454376870403&#39;,
                type: &#39;POST&#39;,
                dataType: &#39;jsonp&#39;,     // 即使写的type是POST也是按照GET请求发送
                jsonp: &#39;callback&#39;,
                jsonpCallback: &#39;list&#39;
            });
        }
 
        function list(arg){         // 自定义函数与callback=list相对应
            console.log(arg);
            var data = arg[&#39;data&#39;];
            for(k in data){
                var tr = document.createElement(&#39;td&#39;);
                var week = data[k][&#39;week&#39;];
                var list = data[k][&#39;list&#39;];
                tr.textContent =week
                document.body.appendChild(tr);
                console.log(week);
                for(i in list){
                    var name = list[i][&#39;name&#39;];
                    console.log(name)
        }}}
    </script>
</body>

list({data:[ { "week":"周日", "list":[ { "time":"0030", "name":"通宵剧场六集连播", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"0530", "name":"《都市现场》60分钟精编版（重播）", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"0630", "name":"《快乐生活一点通》", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"0700", "name":"《e早晨报》60分钟直播版块", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"0800", "name":"精选剧场四集连播", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1120", "name":"《地宝当家》（重播）", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1200", "name":"《都市60分》60分钟直播版块", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1300", "name":"《谁是赢家》", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1400", "name":"女性剧场三集连播", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1700", "name":"《快乐生活一点通》精编版", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1730", "name":"《地宝当家》", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1800", "name":"《都市现场》90分钟直播版块", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1930", "name":"《都市情缘》", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"2000", "name":"《晚间800》", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"2020", "name":"《都市剧场》黄金剧（第1集）", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"2110", "name":"《都市剧场》黄金剧（第2集）", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"2200", "name":"《拍案》", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"2230", "name":"江西新闻联播(重播)", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"2250", "name":"都市晚剧场", "link":"http://www.jxntv.cn/live/jxtv2.shtml" } ] }, { "week":"周一", "list":[ { "time":"0030", "name":"通宵剧场六集连播", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"0530", "name":"《都市现场》60分钟精编版（重播）", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"0630", "name":"《快乐生活一点通》", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"0700", 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"link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"2250", "name":"都市晚剧场", "link":"http://www.jxntv.cn/live/jxtv2.shtml" } ] },{ "week":"周六", "list":[ { "time":"0030", "name":"通宵剧场六集连播", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"0530", "name":"《都市现场》60分钟精编版（重播）", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"0630", "name":"《快乐生活一点通》", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"0700", "name":"《e早晨报》60分钟直播版块", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"0800", "name":"精选剧场四集连播", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1120", "name":"《地宝当家》（重播）", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1200", "name":"《都市60分》60分钟直播版块", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1300", "name":"《谁是赢家》", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1400", "name":"女性剧场三集连播", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1700", "name":"《快乐生活一点通》精编版", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1730", "name":"《地宝当家》", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1800", "name":"《都市现场》90分钟直播版块", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"1930", "name":"《都市情缘》", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"2000", "name":"《晚间800》", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"2020", "name":"《都市剧场》黄金剧（第1集）", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"2110", "name":"《都市剧场》黄金剧（第2集）", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"2200", "name":"《拍案》", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"2230", "name":"江西新闻联播(重播)", "link":"http://www.jxntv.cn/live/jxtv2.shtml" }, { "time":"2250", "name":"都市晚剧场", "link":"http://www.jxntv.cn/live/jxtv2.shtml" } ] }] });

Note: The implementation process is exactly the same as the code written by the third person. It also creates a script and then deletes it

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mPDF

mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

Zend Studio 13.0.1

Powerful PHP integrated development environment

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