Uploading a file using a form in the Google App Engine to a static URL is it possible

Matthew Rappard

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Jul 30, 2015, 11:18:55 AM7/30/15

to Google App Engine

I just want to know if it's possible to make the following HTML code, work with the Google App Engine. I.E. this form will upload a file to a "STATIC" address that is stored in the Google App Engine. It can't be dyanmic it has to be the same URL across all devices.

<html>
<form action="THE_URL" method="POST" enctype="multipart/form-data">
Application name:<input type="text" name="appname">
Application version:<input type="text" name="appversion">
Email from:<input type="text" name="emailfrom">
Email subject:<input type="text" name="emailsubject">
Crash GUID:<input type="text" name="crashguid">
MD5:<input type="text" name="md5">
Attach ZIP file:<input type="file" name="crashrpt">
<input type="submit" name="Submit">
</form>
</html>

Barry Hunter

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Jul 30, 2015, 11:29:14 AM7/30/15

to google-appengine

Yes, that sort of functionality can be implemented on AppEngine

The blobstore provides much of the functionality. But there are other ways

Eg uploading a blob

https://cloud.google.com/appengine/docs/python/blobstore/#Python_Uploading_a_blob

Once uploaded, can 'serve' the blob

https://cloud.google.com/appengine/docs/python/blobstore/#Python_Serving_a_blob

You can make your handler work on any device. Its dynamic in that its processed by a script (to figure out what blob to serve) - but its static, in that the URL itself doesnt need to change, and can persist long term.

Can also use Google Storage instead

https://cloud.google.com/appengine/docs/php/googlestorage/user_upload

... once uploaded to Storage, it has a URL for direct access to the uploaded file.

Matthew Rappard

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Jul 30, 2015, 11:59:43 AM7/30/15

to Google App Engine, barryb...@gmail.com

Okay so my thing is Blobstore works by creating a dynamic that you call via blobstore.create_upload_url() which would be great, if I could get the dyanmic URL but I can't hence the need for a static URL.

Barry Hunter

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Jul 30, 2015, 12:18:12 PM7/30/15

to google-appengine

So your problem is that create_upload_url creates a long, verbose url. One not repeatable?

You want a nice simple 'endpoint' to upload to?

could directly handle the POST yourself in a dynamic handler (accept the uploaded file directly)

http://stackoverflow.com/questions/25645253/python-parsing-multipart-form-data-request-on-server-side

Its a little more tricky to then send the file to the BlobStore - esp with the deprecation of the Files API.

... probably easier to then send the file direct to Google Storage.

https://cloud.google.com/appengine/docs/python/googlecloudstorageclient/

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Matthew Rappard

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Jul 30, 2015, 12:36:41 PM7/30/15

to Google App Engine, barryb...@gmail.com

The issue is that the URL becomes inactive after X amount of time, as well as the code I sent is really just a proxy for what a C++ library is doing.

I don't really need it in the Google App engine, I just need to be stored somewhere so even turning it into an email attachment and mailing it would be fine.

The code

class CrashUploader(webapp2.RequestHandler):

def post(self):

file_data = self.request.get("crashrpt",default_value='This Failed');

grabs something. Does anyone know if I can use mail.send_mail to send it out as an attachment.

Barry Hunter

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Jul 30, 2015, 12:47:52 PM7/30/15

to Matthew Rappard, Google App Engine

I don't really need it in the Google App engine, I just need to be stored somewhere so even turning it into an email attachment and mailing it would be fine.

The code

class CrashUploader(webapp2.RequestHandler):
def post(self):
file_data = self.request.get("crashrpt",default_value='This Failed');

grabs something. Does anyone know if I can use mail.send_mail to send it out as an attachment.

Yes

https://cloud.google.com/appengine/docs/python/mail/attachments

So your dynamic handler could just accept the file, and immidiately send it out. Rather than storing it somewhere.

Matthew Rappard

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Jul 30, 2015, 1:37:18 PM7/30/15

to Google App Engine, barryb...@gmail.com

If anyone is following here code that is working

class CrashUploader(webapp2.RequestHandler):

def post(self):

attachments = self.request.POST.get('crashrpt')

entity = DatastoreFile(data=attachments.value, mimetype=attachments.type)

entity.appname =self.request.get('appname')

entity.appversion =self.request.get('appversion')

entity.emailfrom =self.request.get('emailfrom')

entity.crashguid =self.request.get('crashguid')

entity.md5 =self.request.get('md5')

entity.put()

file_url = "http://%s/%d/%s" % (self.request.host, entity.key().id(), file.name)

self.response.out.write("Your uploaded file is now available at %s" % (file_url,))

mail.send_mail(sender="YOUR_SITE",

to="THE ACCOUNT YOU WANT THEM TO GO TO",

subject="Crash Report",

body="""

Attached is the document file you requested. Is at %s

"""%file_url)

class CrashDownload(webapp.RequestHandler):

def get(self, id, filename):

entity = DatastoreFile.get_by_id(int(id))

self.response.headers['Content-Type'] = 'application/zip'

self.response.out.write(entity.data)

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