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***************
Uploading Files
***************
When a client uploads a file to a CherryPy application, it's placed
on disk immediately. CherryPy will pass it to your exposed method
as an argument (see "myFile" below); that arg will have a "file"
attribute, which is a handle to the temporary uploaded file.
If you wish to permanently save the file, you need to read()
from myFile.file and write() somewhere else.
Note the use of 'enctype="multipart/form-data"' and 'input type="file"'
in the HTML which the client uses to upload the file.
Here is a simple example that shows how file uploads are handled by CherryPy::
import os
localDir = os.path.dirname(__file__)
absDir = os.path.join(os.getcwd(), localDir)
import cherrypy
class FileDemo(object):
def index(self):
return """
<html><body>
<h2>Upload a file</h2>
<form action="upload" method="post" enctype="multipart/form-data">
filename: <input type="file" name="myFile" /><br />
<input type="submit" />
</form>
<h2>Download a file</h2>
<a href='download'>This one</a>
</body></html>
"""
index.exposed = True
def upload(self, myFile):
out = """<html>
<body>
myFile length: %s<br />
myFile filename: %s<br />
myFile mime-type: %s
</body>
</html>"""
# Although this just counts the file length, it demonstrates
# how to read large files in chunks instead of all at once.
# CherryPy reads the uploaded file into a temporary file;
# myFile.file.read reads from that.
size = 0
while True:
data = myFile.file.read(8192)
if not data:
break
size += len(data)
return out % (size, myFile.filename, myFile.content_type)
upload.exposed = True
tutconf = os.path.join(os.path.dirname(__file__), 'tutorial.conf')
if __name__ == '__main__':
# CherryPy always starts with app.root when trying to map request URIs
# to objects, so we need to mount a request handler root. A request
# to '/' will be mapped to HelloWorld().index().
cherrypy.quickstart(FileDemo(), config=tutconf)
else:
# This branch is for the test suite; you can ignore it.
cherrypy.tree.mount(FileDemo(), config=tutconf)
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