CODEWITHSUNDEEP
pythonpython-2.7http-redirectcgi
kkk
kkk

Reputation: 1920

How to perform a HTTP redirection using python

I am calling my python script after a HTML form is submitted by the user . My python script is present in usr/lib/cgi-bin . I want to redirect to another page depending on the inputs provided by the user , basically I am creating a login script where if the user inputs are valid then the user will be redirected to the loggedin.html page else to error.html page

signin.py (i am trying to execute this code)

#! /usr/bin/python2.7

import cgi, cgitb 

# import pymongo module for connecting to mongodb database

import pymongo
from pymongo import MongoClient

# Create instance of FieldStorage 
form = cgi.FieldStorage() 

# creating a mongo client to the running mongod instance
client = MongoClient()

# selecting the database mydb 
db_mydb = client.mydb

# selecting the collection user
collection_user = db_mydb.user

print "Content-type:text/html\r\n\r\n"
print "<html>"
print "<head>"
print "<title>Signin</title>"
print "</head>"

# Get data from fields
email = form.getvalue('login-username')
password  = form.getvalue('login-password')

#checking whether user inputs are correct or not
 existence_query=collection_user.find_one({"_id":email,"password":password})

print "<body>"

if(existence_query):
    print "person exists"
    print "Status: 301 Moved\r\n\r\n"
    print "Location : http://localhost/mongo/loggedin.html\r\n\r\n"

else:
    print "person does't exists"
    #redirecting to error.html page
print "</body>"
print "</html>"

Output that I am getting after this script is called from my html form (when user inputs are valid i.e user is a valid):

person exists Location:http:localhost/mongo/loggedin.html

I am new to cgi using python so any help would be great to me

Upvotes: 1

Views: 2458

Answers (2)

kkk
kkk

Reputation: 1920

 # Import modules for CGI handling 

    import cgi, cgitb 

    # import pymongo module for connecting to mongodb database
    import pymongo
    from pymongo import MongoClient

    # Create instance of FieldStorage 
    form = cgi.FieldStorage() 

    # creating a mongo client to the running mongod instance
    # The code will connect on the default host and port i.e 'localhost' and '27017'
    client = MongoClient()

    # selecting the database mydb 
    db_mydb = client.mydb

    # selecting the collection user
    collection_user = db_mydb.user

    #print "Content-type:text/html\r\n\r\n"

    # Get data from fields
    email = form.getvalue('login-username')
    password  =     form.getvalue('login-password')

    #checking whether user inputs are correct or not
    existence_query = collection_user.find_one({"_id":email,"password":password})


    if(existence_query):
        print "Location:http://localhost/mongo/index.html\r\n"
        print "Content-type:text/html\r\n\r\n"
    else:
        print "Location:http://localhost/mongo/index.html\r\n"
        print "Content-type:text/html\r\n\r\n"

Headers need to be initialized in the starting before any other data being sent to the browser.In the question print statements like print "<html>"were written before location header and so the desired result wasn't achieved.

Upvotes: 2

ForceBru
ForceBru

Reputation: 44838

From Python docs on the cgi module

The output of a CGI script should consist of two sections, separated by a blank line. The first section contains a number of headers, telling the client what kind of data is following.

You have to send headers before any other data you want to send. To accomplish your goal, just put all the header sending logic before the HTML-sending one.

But you'd better move all the form-checking code to another file so it doesn't print anything, just sends redirects and stuff.

Upvotes: 1

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