[web2py] Process uploaded file and save it in Folder uploads

[Gerd]

Hi!

I have to anonymize HL7 file (replace all personal data with x). How can i 
process an uploaded file "on the fly". This is what i've tried (when it 
runs it actually saves the original file content, not the processed)

*# Model*
db.define_table('filetypes',
    Field('filetype','string'),
    Field('seperator','string'),
    Field('omit','string'),
    format='%(filetype)s'
)

db.define_table('anonymize',
    Field('filetype','reference filetypes'),
    Field('uploaded_file','upload')
)

*# Controller*
def index():
    """
    example action using the internationalization operator T and flash
    rendered by views/default/index.html or views/generic.html

    if you need a simple wiki simple replace the two lines below with:
    return auth.wiki()
    """
    form = SQLFORM(db.anonymize)

    data = ''
    import re
    hl7 = 
{'PID':{'pattern':'PID\|','separator':'|','omit':(0,1,2,3)},'NK1':{'pattern':'NK1\|','separator':'|','omit':(0,)},'PV1':{'pattern':'PV1\|','separator':'|','omit':(0,)},'IN1':{'pattern':'IN1\|','separator':'|','omit':(0,)}}
    if request.vars.uploaded_file != None and 
request.vars.uploaded_file.filename != '': 
        if re.search('|'.join([hl7[k]['pattern'] for k in hl7]), 
request.vars.uploaded_file.value):
            for line in request.vars.uploaded_file.value.splitlines():
                replaced_text = ''
                for k in hl7:
                    replaced_text = '|'.join([len(val) * 'x' if idx not in 
hl7[k]['omit'] else val for idx, val in enumerate([splitted_text for 
splitted_text in line.split(hl7[k]['separator'])])]) if 
re.search(hl7[k]['pattern'],line) else replaced_text
                data += (replaced_text if replaced_text != '' else line) + 
'\n'
            request.vars.uploaded_file.value = data
        else:
            data = 'No HL7 Format'
    else:
        data = u'No file chosen'

    if form.process().accepted:
        response.flash = 'form accepted'
    elif form.errors:
        response.flash = 'form has errors'
    return locals()

I thought that the line
request.vars.uploaded_file.value = data
replaces the original data of the uploaded file, so that the form.process() 
processes the new (replaced) value

What i am doing wrong here?

Thanks,
Gerd

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