As available in the google documentation, we need a UploadHandler ? How it
is achieved in the above code ?
On Thursday, March 8, 2012 1:38:04 AM UTC+5:30, Sushant Taneja wrote:
>
> Hi,
>
> Can you explain some of the code like how and in which variable the
> blob_key is saved after the image successfully uploaded in the blobstore ?
>
> On Thursday, March 1, 2012 10:53:30 PM UTC+5:30, howesc wrote:
>>
>> my blobstore_image model:
>>
>> db.define_table('blobstore_image',
>> db.version_info,
>> Field('blob_key', 'upload', notnull=True,
>> requires=IS_LENGTH(1048576),
>> represent=lambda image : A('download', _href=URL(
>> r=request, c='gae_blobstore', f='download',
>> args=[image])),
>> label="Image"),
>> Field('image_url', length=500),
>> Field('name', length=128,
>> requires=IS_NOT_IN_DB(db, 'blobstore_image.name')),
>> Field('type', length=128, requires=IS_IN_SET(['i_classify',
>> 'my_images',
>> 'by_type'],
>> zero=None)),
>> migrate=True)
>>
>>
>> my upload controller:
>>
>> def upload_image():
>> """
>> This is the integration of the GAE blobstore with the image upload
>> process
>>
>> @TODO: figure out how to test this. image upload is going to be kinda
>> difficult to spoof
>> """
>> #@TODO: how do we deal with deleting an image?
>> logging.info(repr(request.post_vars))
>>
>> fields=['name',
>> 'type',
>> 'blob_key']
>>
>> form = SQLFORM(db.blobstore_image, fields=fields,
>> formstyle='divs')
>> if request.args and request.args[0]:
>> form = SQLFORM(db.blobstore_image, request.args[0], fields=fields,
>> upload=URL(r=request, c='gae_blobstore', f='preview'),
>> formstyle='divs')
>>
>> if request.env.web2py_runtime_gae:
>> from google.appengine.ext import blobstore
>> from google.appengine.api.images import get_serving_url
>> import uuid
>> #get the blob_info. NOTE this MUST be done before any other
>> operations on
>> # the request vars. otherwise something modifies them (perhaps the
>> form
>> # validators) in a way that makes this not work
>> blob_info = None
>> if request.vars.blob_key == '':
>> #it seems that prod blobstore returns empty string instead of
>> None when
>> #there are no changes to the image
>> request.vars.blob_key = None
>> if request.vars.blob_key != None:
>> blob_info = blobstore.parse_blob_info(request.vars.blob_key)
>> del request.vars['blob_key']
>>
>> upload_url =
>> blobstore.create_upload_url(URL(r=request,f='upload_image',
>> args=request.args,
>>
>> vars={'redir':URL(r=request,c='dataadmin', f='index')}))
>>
>> form['_action']=upload_url
>> #since we are setting the action after the form was initially created
>> we
>> # need to reset the form.custom.begin
>> (begin, end) = form._xml()
>> form.custom.begin = XML("<%s %s>" % (form.tag, begin))
>>
>> if form.accepts(request.vars,session, formname="uploadimage"):
>> #@TODO: can this be a post-validation function?
>> #get the record we just inserted/modified
>> row = db(db.blobstore_image.id == form.vars.id).select().first()
>> if request.vars.blob_key__delete == 'on' or \
>> (blob_info and (row and row.blob_key)):
>> #remove from blobstore because of delete or update of image
>> decoded_key = base64.b64decode(row.blob_key.split('.')[0])
>> blobstore.delete(decoded_key)
>> #remove reference in the artwork record
>> row.update_record(blob_key=None)
>> if blob_info:
>> logging.info("adding blob_key " + str(blob_info.key()))
>> #add reference to image in this record
>> key = base64.b64encode(str(blob_info.key())) +"." +
>> blob_info.content_type.split('/')[1]
>> url = get_serving_url(str(blob_info.key()))
>>
>> row.update_record(blob_key = key, image_url = url)
>>
>> crud.archive(form)
>> session.flash="Image saved"
>> #Raise the HTTP exception so that the response content stays
>> empty.
>> #calling redirect puts content in the body which fails the blob
>> upload
>> raise HTTP(303,
>> Location= URL(r=request,f='upload_image', args=
>> form.vars.id))
>> elif form.errors:
>> #logging.info("form not accepted")
>> logging.info(form.errors)
>> session.flash=BEAUTIFY(form.errors)
>> #there was an error, let's delete the newly uploaded image
>> if blob_info:
>> blobstore.delete(blob_info.key())
>> #Raise the HTTP exception so that the response content stays
>> empty.
>> #calling redirect puts content in the body which fails the blob
>> upload
>> redirvars = {}
>> redirvars['form_errors']=True
>> redirvars['error_dict'] = form.errors
>> raise HTTP(303,
>> Location= URL(r=request,f='upload_image',
>> args=request.args,
>> vars=redirvars))
>> return dict(form=form,
>> aahome=A("data Home", _href=URL(r=request, f='index')),
>> back=A("Query view",
>> _href=URL(r=request, f='query',
>> args=['blobstore_image'])))
>>
>>
>> hope that helps!
>>
>> cfh
>>
>
