我有一个由 Heroku 中的 Django + Tastypie 和 S3 中的图像仓库组成的架构。当用户从前端(用 JS 编写)上传照片时,我所做的就是将照片调整为特定尺寸(最大 600 x 600 尺寸),始终保持纵横比。我将粘贴代码来执行此操作(它有效)。
视图.py:
class UploadView(FormView):
form_class = OriginalForm
def form_valid(self, form):
original = form.save()
if original.image_width > 280 and original.image_height > 281:
if original.image_width > 600 or original.image_height > 600:
original.resize((600, 600))
if not original.image:
return self.success(self.request, form, None, errors = 'Error while uploading the image')
original.save()
up = UserProfile.objects.get(user = request.user.pk)
#Save the images to s3
s3 = S3Custom()
new_image = s3.upload_file(original.image.path, 'avatar')
#Save the s3 image path, as string, in the user profile
up.avatar = new_image
up.save
else:
return self.success(self.request, form, None, errors = 'The image is too small')
return self.success(self.request, form, original)
在这里,我要做的是检查图像是否大于 280 x 281(前端的裁剪正方形具有该大小),并检查图像的一侧是否大于 600 像素。如果是这种情况,我调用我的原始类的(自定义)方法调整大小......
模型.py:
class Original(models.Model):
def upload_image(self, filename):
return u'avatar/{name}.{ext}'.format(
name = uuid.uuid4().hex,
ext = os.path.splitext(filename)[1].strip('.')
)
def __unicode__(self):
return unicode(self.image)
owner = models.ForeignKey('people.UserProfile')
image = models.ImageField(upload_to = upload_image, width_field = 'image_width', height_field = 'image_height')
image_width = models.PositiveIntegerField(editable = False, default = 0)
image_height = models.PositiveIntegerField(editable = False, default = 0)
def resize(self, size):
if self.image is None or self.image_width is None or self.image_height is None:
print 'Cannot resize None things'
else:
IMG_TYPE = os.path.splitext(self.image.name)[1].strip('.')
if IMG_TYPE == 'jpeg':
PIL_TYPE = 'jpeg'
FILE_EXTENSION = 'jpeg'
elif IMG_TYPE == 'jpg':
PIL_TYPE = 'jpeg'
FILE_EXTENSION = 'jpeg'
elif IMG_TYPE == 'png':
PIL_TYPE = 'png'
FILE_EXTENSION = 'png'
elif IMG_TYPE == 'gif':
PIL_TYPE = 'gif'
FILE_EXTENSION = 'gif'
else:
print 'Not a valid format'
self.image = None
return
#Open the image from the ImageField and save the path
original_path = self.image.path
fp = open(self.image.path, 'rb')
im = Image.open(StringIO(fp.read()))
#Resize the image
im.thumbnail(size, Image.ANTIALIAS)
#Save the image
temp_handle = StringIO()
im.save(temp_handle, PIL_TYPE)
temp_handle.seek(0)
#Save image to a SimpleUploadedFile which can be saved into ImageField
suf = SimpleUploadedFile(os.path.split(self.image.name)[-1], temp_handle.read(), content_type=IMG_TYPE)
#Save SimpleUploadedFile into image field
self.image.save('%s.%s' % (os.path.splitext(suf.name)[0],FILE_EXTENSION), suf, save=False)
#Delete the original image
fp.close()
os.remove(original_path)
#Save other fields
self.image_width = im.size[0]
self.image_height = im.size[1]
return
您需要的最后一件事是包含自定义 s3 方法的“库”:
class S3Custom(object):
conn = S3Connection(settings.AWS_ACCESS_KEY_ID, settings.AWS_SECRET_ACCESS_KEY)
b = Bucket(conn, settings.AWS_STORAGE_BUCKET_NAME)
k = Key(b)
def upload_file(self, ruta, prefix):
try:
self.k.key = '%s/%s' % (prefix, os.path.split(ruta)[-1])
self.k.set_contents_from_filename(ruta)
self.k.make_public()
except Exception, e:
print e
return '%s%s' % (settings.S3_URL, self.k.key)
您的设置文件中应该有 AWS_ACCESS_KEY_ID、AWS_SECRET_ACCESS_KEY、AWS_STORAGE_BUCKET_NAME、S3_URL。