You can use arbitrary drawing commands in the onPage function, so you can just draw a paragraph (see section 5.3 in the reportlab user guide) from your function.
Here is a complete example:
from reportlab.lib.pagesizes import letter
from reportlab.lib.styles import getSampleStyleSheet
from reportlab.platypus import BaseDocTemplate, Frame, PageTemplate, Paragraph
styles = getSampleStyleSheet()
styleN = styles['Normal']
styleH = styles['Heading1']
def footer(canvas, doc):
canvas.saveState()
P = Paragraph("This is a multi-line footer. It goes on every page. " * 5,
styleN)
w, h = P.wrap(doc.width, doc.bottomMargin)
P.drawOn(canvas, doc.leftMargin, h)
canvas.restoreState()
doc = BaseDocTemplate('test.pdf', pagesize=letter)
frame = Frame(doc.leftMargin, doc.bottomMargin, doc.width, doc.height,
id='normal')
template = PageTemplate(id='test', frames=frame, onPage=footer)
doc.addPageTemplates([template])
text = []
for i in range(111):
text.append(Paragraph("This is line %d." % i,
styleN))
doc.build(text)
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