ReCaptcha for django forms (improved and with remoteip)

My previous snippet with captcha wasn't very portable but Marco Fucci figured out the thing that I couldn't - value_from_datadict function. So all credits go to him and his snippet, I adapted it to my needs, maybe you like my version better - it doesn't need any captcha libraries and let's you modify the widget's html easily. Also I added an option to pass remoteip to google api's verify method. How to use it: In your settings.py add: RECAPTCHA_PUBKEY = 'your recaptcha public key' RECAPTCHA_PRIVKEY = 'your recaptcha private key' After that just import and use ReCaptchaField in your form as you would any other field. That's it. *** Important *** If you want to have peace of mind in case google decided that the remoteip parametr is mandatory then: Derive every form that has the captcha field from ReCaptchaForm and when you create the form object after receiving POST/GET, pass a remoteip parameter like that: form = YourCaptchaForm(data=request.POST, remoteip=request.META['REMOTE_ADDR'])

• forms
• captcha
• recaptcha

Mon 11 Apr 2011 Read More

Plaintext format (advanced spaceless)

A template loader useful for writing templates with carefully controlled newlines and spaces while retaining readable template source code formatting. Start the template with PTFTAG (`{#ptfable#}`, here) to allow it to be processed. Common problems with doing it to most templates as-is is use of newlines to separate words and multiple spaces between tags where spaces are still needed (which is problematic with `spaceless` tag as well). Currently intended as a template loader wrapper, and is suggested to be used with cached loader. Example settings.py configuration: _lp = lambda lo, *ar: (lo, ar,) # loader, arguments TEMPLATE_LOADERS = ( _lp('django.template.loaders.cached.Loader', # cache _lp('ptf.template.ptftemplateloader.Loader', # ptf 'django.template.loaders.filesystem.Loader', 'django.template.loaders.app_directories.Loader', #'django.template.loaders.eggs.load_template_source' ), # ptf ), # cache ) (change `ptf.` to wherever in python path you've put it). You might also need couple of simple template tags for explicitly inserting newlines or whitespaces: def br(): return "\n" br = register.simple_tag(br) # XHTML-XMPP-template compatible. def brx(): return "<br />\n" brx = register.simple_tag(br) def ws(): return " " ws = register.simple_tag(ws) .

• spaceless
• ptf

Sat 09 Apr 2011 Read More

Twitter oAuth example

**UPDATE**: A more complete example is up on [GitHub](http://github.com/henriklied/django-twitter-oauth/tree/master) Based around Simon Willison's [Fire Eagle oAuth](http://www.djangosnippets.org/snippets/655/), this will allow you to develop Twitter oAuth applications (…that is – if you're in the closed beta)

• twitter
• oauth

Sat 09 Apr 2011 Read More

Using the built-in slugify filter outside a template

This is just a very short (and mostly useless on it's own) example of how the built in slugify filter can be used in a Python script to generate slugs. It was pulled from a script I've written to pull in items from Upcoming.org's API. I post it because "sunturi" posted [Snippet #29](http://www.djangosnippets.org/snippets/29/), which duplicates the functionality of the built-in slugify filter. In the comments of that snippet, santuri (and others) seem to believe that template filters can only be used within templates. This is incorrect, and I think it's important people understand they can be used elsewhere. sunturi's snippet does remove prepositions from values before slugifying them, so if you need that, his code will work work. But if all you need is slugification, the built-in slugify filter will work fine -- in a Python script, as well as in a template.

• template
• filter
• django
• slug
• built-in

Fri 08 Apr 2011 Read More

RadioSelectWithHelpText

A Django form widget which displays help text for individual items in a set of radio buttons. It overrides the RadioSelect widget, adding a small bit of HTML after each <input> element, with the help text for each item. It was developed for a Django Dash project I'm working on (called transphorm.me), so isn't as feature-rich as it could be, but if you have any trouble installing it - or if I've miscopied any of my code in my rush - please let me know.

• newforms
• forms
• widgets
• radioselect

Wed 06 Apr 2011 Read More

Generate Javascript-Safe string in template

If you use javascript code with Django-template filter or other related things, it will be not sufficient to qoute string in javascript. This filter escape the string and quote it.

• template
• javascript

Tue 05 Apr 2011 Read More

Rate Limiting Decorator

This is a small and useful decorator that you can use to protect yourself from bad users or bots hitting your site.

• security
• cache-based-rate-limiting
• protection
• rate limiting

Tue 05 Apr 2011 Read More

FileInput with download like (like the fileinput on admin)

Use on forms of your app.

• admin
• file
• input
• fileinput
• likeadmin

Mon 04 Apr 2011 Read More

FileField / ImageField with a delete checkbox

Example model: class MyModel(models.Model): file = RemovableFileField(upload_to='files', \ null=True, blank=True) image = RemovableImageField(upload_to='images', \ null=True, blank=True) A delete checkbox will be automatically rendered when editing such a model using form_for_instance. [UPDATED version which works with ModelForms](http://www.djangosnippets.org/snippets/636/)

• newforms
• models
• imagefield
• filefield
• remove
• delete

Sat 02 Apr 2011 Read More

Human readable file names decorator

This is extremely simple decorator to add possibility to upload files with name specific in some object field. For example image with same name as object slug. Sample **model**: class Test(models.Model): image = models.ImageField(\ upload_to=upload_to_dest(path='pics/', \ human_readable_field='hrname')) hrname = models.CharField( \ max_length=128, \ blank=True, default='') Sample **form** for admin: FNAME_EXP = re.compile('^[A-Za-z0-9\-\_]+$') class TestAdminForm(forms.ModelForm): hrname = forms.RegexField( label="Human Readable File Name", \ regex=FNAME_EXP, \ help_text="""Allowed only latin alphabet (upper and lower cases), underscore and minus characters. PLEASE, DO NOT INCLUDE EXTENSION OF THE FILE. Sample: test-this-file""", \ required=False) class Meta: model = Test Sample *admin.py* for *Test* model: class TestAdmin(admin.ModelAdmin): form = TestAdminForm admin.site.register(Test, TesetAdmin)

• django
• ImageField
• file uploads
• file name
• FileField

Sat 02 Apr 2011 Read More

apache authentication via cookies

Enables cookie based authentication with apache. I needed user authentication for some static files, but couldn't use the method described [here](http://www.djangoproject.com/documentation/apache_auth/) as this prompts the user for his credentials, making him log in twice. There is some overhead in the code, because it runs all request middleware components (only session and auth would be needed). All arguments described in the link above are supported. I use it like this in the apache config: <Location "/protected/location"> PythonPath "['/path/to/proj/'] + sys.path" PythonOption DJANGO_SETTINGS_MODULE myproj.settings PythonOption DjangoPermissionName '<permission.codename>' PythonAccessHandler my_proj.modpython #this should point to accesshandler SetHandler None </Location>

• authentication
• apache

Fri 01 Apr 2011 Read More

Natural language date/time form fields

Form fields use the dateutil module [http://labix.org/python-dateutil](http://labix.org/python-dateutil) to parse natural-language input for date and datetime fields. The callback function will replace all date and datetime fields automatically for form_for_model and form_for_instance. **Note**: by replacing the 'form_class' keyword argument instead of just returning the field itself you preserve the 'required' status of the field.

• newforms
• datetime
• date

Tue 29 Mar 2011 Read More

Admin Input Field Character Count via jQuery

Use this code in *change_form.html* in your projects admin templates to add a character counter beside the input field(s) in admin to let users know how many characters they have remaining for a particular input field. The total number of characters allowed is determined by the max_length in your model for the models.CharField you're using this with. This code is designed to add the counter after the input field, but could easily be customized to fit the style of any admin. If the number of characters remaining is 10 or less the background color changes to yellow to visually warn the user. **Usage Examples:** In this example only the input field with id=id_pull_quote will receive the counter: $(document).ready(function() { $("#id_pull_quote").counter(); }); You could also apply the counter to all input fields on a page: $(document).ready(function() { $("form input[@maxlength]").counter(); }); **Note:** *You have to download jQuery to your project and place the appropriate call in order for this to work. The best place to do this is in the extrahead block. I left my call in as an example but your path and file name will probably vary.* Credit for base jQuery code goes to Brad Landis at [bradlis7.com](http://www.bradlis7.com).

• template
• javascript
• admin
• jquery
• form
• input

Tue 29 Mar 2011 Read More

invalidation of cache-template-tag cache

this function invalidates a template-fragment cache bit. say you have: {% load cache %} {% cache 600 user_cache user.id %} something expensive here {% endcache %} maybe you want to force an update. With this function you can, just call: invalidate_template_cache("user_cache", user.id)

• template
• cache
• invalidate

Sat 26 Mar 2011 Read More

Faster pagination / model object seeking (10x faster infact :o) for larger datasets (500k +)

ModelPagination Designed and Coded by Cal Leeming Many thanks to Harry Roberts for giving us a heads up on how to do this properly! ---------------------------------------------------------------------------- This is a super optimized way of paginating datasets over 1 million records. It uses MAX() rather then COUNT(), because this is super faster. EXAMPLE: >>> _t = time.time(); x = Post.objects.aggregate(Max('id')); "Took %ss"%(time.time() - _t ) 'Took 0.00103402137756s' >>> _t = time.time(); x = Post.objects.aggregate(Count('id')); "Took %ss"%(time.time() - _t ) 'Took 0.92404794693s' >>> This does mean that if you go deleting things, then the IDs won't be accurate, so if you delete 50 rows, you're exact count() isn't going to match, but this is okay for pagination, because for SEO, we want items to stay on the original page they were scanned on. If you go deleting items, then the items shift backwards through the pages, so you end up with inconsistent SEO on archive pages. If this doesn't make sense, go figure it out for yourself, its 2am in the morning ffs ;p Now, the next thing we do, is use id seeking, rather then OFFSET, because again, this is a shitton faster: EXAMPLE: >>> _t = time.time(); x = map(lambda x: x, Post.objects.filter(id__gte=400000, id__lt=400500).all()); print "Took %ss"%(time.time() - _t) Took 0.0467309951782s >>> _t = time.time(); _res = map(lambda x: x, Post.objects.all()[400000:400500]); print "Took %ss"%(time.time() - _t) Took 1.05785298347s >>> By using this seeking method (which btw, can be implemented on anything, not just pagination) on a table with 5 million rows, we are saving 0.92s on row count, and 1.01s on item grabbing. This may not seem like much, but if you have 1024 concurrent users, this will make a huge difference. If you have any questions or problems, feel free to contact me on cal.leeming [at] simplicitymedialtd.co.uk

• model
• pagination
• object
• large
• big
• dataset
• faster
• optimized
• quicker
• seeking

Thu 24 Mar 2011 Read More