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""" |
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Tutorial: File upload and download |
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Uploads |
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------- |
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When a client uploads a file to a CherryPy application, it's placed |
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on disk immediately. CherryPy will pass it to your exposed method |
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as an argument (see "myFile" below); that arg will have a "file" |
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attribute, which is a handle to the temporary uploaded file. |
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If you wish to permanently save the file, you need to read() |
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from myFile.file and write() somewhere else. |
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Note the use of 'enctype="multipart/form-data"' and 'input type="file"' |
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in the HTML which the client uses to upload the file. |
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Downloads |
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--------- |
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If you wish to send a file to the client, you have two options: |
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First, you can simply return a file-like object from your page handler. |
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CherryPy will read the file and serve it as the content (HTTP body) |
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of the response. However, that doesn't tell the client that |
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the response is a file to be saved, rather than displayed. |
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Use cherrypy.lib.static.serve_file for that; it takes four |
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arguments: |
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serve_file(path, content_type=None, disposition=None, name=None) |
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Set "name" to the filename that you expect clients to use when they save |
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your file. Note that the "name" argument is ignored if you don't also |
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provide a "disposition" (usually "attachement"). You can manually set |
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"content_type", but be aware that if you also use the encoding tool, it |
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may choke if the file extension is not recognized as belonging to a known |
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Content-Type. Setting the content_type to "application/x-download" works |
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in most cases, and should prompt the user with an Open/Save dialog in |
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popular browsers. |
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""" |
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import os |
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localDir = os.path.dirname(__file__) |
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absDir = os.path.join(os.getcwd(), localDir) |
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import cherrypy |
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from cherrypy.lib import static |
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class FileDemo(object): |
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def index(self): |
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return """ |
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<html><body> |
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<form action="upload" method="post" enctype="multipart/form-data"> |
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filename: <input type="file" name="myFile" /><br /> |
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<input type="submit" /> |
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</form> |
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</body></html> |
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""" |
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index.exposed = True |
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def upload(self, myFile): |
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out = """<html> |
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<body> |
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myFile length: %s<br /> |
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myFile filename: %s<br /> |
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myFile mime-type: %s |
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</body> |
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</html>""" |
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size = 0 |
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while True: |
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data = myFile.file.read(8192) |
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if not data: |
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break |
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size += len(data) |
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return out % (size, myFile.filename, myFile.type) |
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upload.exposed = True |
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def download(self): |
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path = os.path.join(absDir, "pdf_file.pdf") |
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return static.serve_file(path, "application/x-download", |
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"attachment", os.path.basename(path)) |
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download.exposed = True |
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cherrypy.tree.mount(FileDemo()) |
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if __name__ == '__main__': |
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import os.path |
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cherrypy.config.update(os.path.join(os.path.dirname(__file__), 'tutorial.conf')) |
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cherrypy.server.quickstart() |
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cherrypy.engine.start() |
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