How to upload, using python, a form that contains an image?

Question

I have trouble doing this...

You may want to get the same result as in http://i.joyton.com:2010 Using this image., and other parameters keep default.

def search_img(item, image_name):
try:
    f = open(image_name, 'rb')
    img = f.read()
    print type(img)
except IOError, e:
    print 'fail to open %s' % image_name
    print e
    return None

ts = str(time.time())

m = md5.new('testsearch_by_image' + item)
m.update(ts)
m.update('0123456789')
sign = m.hexdigest()

params = urllib.urlencode( {
    'item': item,
    'app_key': 'test',
    'cmd':'search_by_image',
    'sign':sign,
    'img_file':img,
    'extra':'',
    'time_stamp':ts,
    })

headers = {'Content-type': 'application/x-www-form-urlencode',
           'Accept': 'text/plain'}

conn = httplib.HTTPConnection('i.joyton.com', 2010)
conn.request('POST', '', params, headers)
response = conn.getresponse()

print response.status, response.reason
print response.read()
conn.close()
return response.read()

if __name__ == '__main__':
    search_img('book', 'f:\\book_001.jpg')

In the browser everything works perfectly, but my script does not. Sometimes the script returns the right result; sometimes it gets other books, sometimes it gets nothing at all. When it gets other books, these books are usually searched by others recently.

Answer 1

Here is your code modified to do a multipart/form-data. Although this didn't work, when I tested at my PC against your URL, it probably needs some hacking (may be the sign isn't proper or something) before you can get it to work.

import mimetypes
import string
import random
import time
import md5
import httplib

def upload(fields,files):
    boundaryChars = list(string.lowercase) + list(string.uppercase) + \
                    [str(x) for x in range(10)] + ['_'*10]
    random.shuffle(boundaryChars)    

    boundary = '----------RaNdOm_crAPP'+''.join(boundaryChars[:20])
    CRLF = '\r\n'
    elem = []
    for key in fields:
        elem.append('--' + boundary)
        elem.append('Content-Disposition: form-data; name="%s"' % key)
        elem.append('')
        elem.append(fields[key])
    for (key, filename,value) in files:
        elem.append('--' + boundary)
        elem.append('Content-Disposition: form-data; name="%s"; filename="%s"' % (key, filename))
        elem.append('Content-Type: %s' % mimetypes.guess_type(filename)[0] or \
                        'application/octet-stream')
        elem.append('')
        elem.append(value)
    elem.append('--' + boundary + '--')
    elem.append('')
    body = CRLF.join(elem)
    content_type = 'multipart/form-data; boundary=%s' % boundary
    return content_type, body

def search_img(item, image_name):
    try:
        f = open(image_name, 'rb')
        img = f.read()
    except IOError, e:
        print 'fail to open %s' % image_name
        print e
        return None

    ts = str(time.time())

    m = md5.new('testsearch_by_image' + item)
    m.update(ts)
    m.update('0123456789')
    sign = m.hexdigest()

    #params = urllib.urlencode( )

    contentType,body = upload({
        'item': item,
        'app_key': 'test',
        'cmd':'search_by_image',
        'sign':sign,
        #'img_file':img,
        'extra':'',
        'time_stamp':ts,
        },
        [('img_file', image_name, img)]
    )
    headers = {
        'Accept':'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
        'Content-type': contentType,
        'User-Agent':'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/536.5 (KHTML, like Gecko) Chrome/19.0.1084.56 Safari/536.5',
        'Host':'i.joyton.com:2010',
        'Origin':'http://i.joyton.com:2010',
        'Referer':'http://i.joyton.com:2010/'
    }
    #print c
    #print body

    conn = httplib.HTTPConnection('i.joyton.com', 2010)
    conn.request('POST', '/', body, headers)
    response = conn.getresponse()

    print response.status, response.reason
    print response.read()
    conn.close()
    return response.read()

if __name__ == '__main__':
    search_img('book', 'iMgXS.jpg') #the same image.