Django Image Uploads/Serving + Sending Emails in Django PDF

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Summary

These notes contains information from the lectures given for web applications. Specifically, they go over how to implement image uploads and serving on a django site, as well as how to use SMTP to prototype and test an email verification system.

These notes are essential to homework 3....

Description

Dj#ngo Im#ge Uplo#ds # upload_to will upload to the MEDIA_ROOT/addr-book-photos/ directory # Set MEDIA_ROOT environment variable in settings.py # Blank = true makes the field optional add models.ImageField(upload_to=“addr-book-photos”, blank = True)

In forms.py override the def+ult widget for the model form (if you w+nt to prevent deletion)

class (forms.ModelForm): exclude = ( , ) widgets = { ‘picture’ : forms.FileInput() }

in views.py def edit_entry(requeust): if rejjquest.method == “Get”: #Simply serve the page context = {‘form’:EntryForm()} return render(request, ‘simple-address-book/addentry.html’, context) new_entry = Entry(owner=request.user) #create the loaded form form = EntryForm(request.POST, request.FILES, instance=new_entry) ## NOTE: WE ADD REQUEST.FILES to the constructor. otherwise the action is exactly the same. install PIL

Dj#ngo Im#ge Serving when you go to displ+y + dyn+mic im+ge you need this:

In urls.py A route to some kind of ‘getphotoʼ url th+t h+s + regex for /get_photo/ th+t resolves to some function th+t returns the correct url for th+t photos id. in .html we displ+y the content with + lo+ded form, so we c+n simply check if

form.picture.v+lue is true to see if the model th+t lo+ded the form h+d + picture included.

In views.py from django.http import HttpResponse, Http404 # We can’t just use render() anmore from mimetypes import guess_type # Helper function to guess a MIME type from a file type at the get_photo url action: it uses @login_required def get_photo(request, id): entry = get_object_or_404(Entry, owner=request.user, id=id) # We make sure the requested user has permession to access the correct photo if not entry.picture: raise Http404 content_type = guess_type(entry.picture.name) return HttpResponse(entry.picture, mimetype=content_type)

Sending Em#ils In gener+l, sending em+il from within python is very e+sy. You c+n e+sily use SMTP +nd the MIMEText cl+ss to send em+ils. However, you must use +n extern+l SMTP server. we c+n use smtp.+ndrew.cmu.edu. however, this is b+d bec+use you would h+ve to put your +ndrew id in code ( could just use b+sh v+ri+bles??????? le+rn2code ) in settings.py

# To enable real email sending, uncomment and configure below # EMAIL_HOST = ‘smtp.andrew.cmu.edu’ # EMAIL_HOST_USER = ‘gbose’ # EMAIL_HOST_PASSWORd = ‘’ # EMAIL_USE_TLS = True for homework EMAIL_BAKCEND = ‘django.core.mail.backends.console.EmailBackend’

in views.py from django.core.mail import send_mail send_mail(subject = “verify your email address”, message = email-body, from_email = “Chalieewfwefoijwfoj” recipeint_list=([new_user.email])...