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

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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) 

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. 


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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

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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