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#
# Using the ReportLab toolkit from within Zope
#
# WARNING : The MyPDFDoc class deals with ReportLab's platypus framework,
# while the MyPageTemplate class directly deals with ReportLab's
# canvas, this way you know how to do with both...
#
# License : the ReportLab Toolkit's one
# see : http://www.reportlab.com
#
# Author : Jerome Alet - alet@librelogiciel.com
#
#
from io import BytesIO
try :
from Shared.reportlab.platypus.paragraph import Paragraph
from Shared.reportlab.platypus.doctemplate import *
from Shared.reportlab.lib.units import inch
from Shared.reportlab.lib import styles
from Shared.reportlab.lib.utils import ImageReader
except ImportError :
from reportlab.platypus.paragraph import Paragraph
from reportlab.platypus.doctemplate import *
from reportlab.lib.units import inch
from reportlab.lib import styles
from reportlab.lib.utils import ImageReader
class MyPDFDoc :
class MyPageTemplate(PageTemplate) :
"""Our own page template."""
def __init__(self, parent) :
"""Initialise our page template."""
#
# we must save a pointer to our parent somewhere
self.parent = parent
# Our doc is made of a single frame
content = Frame(0.75 * inch, 0.5 * inch, parent.document.pagesize[0] - 1.25 * inch, parent.document.pagesize[1] - (1.5 * inch))
PageTemplate.__init__(self, "MyTemplate", [content])
# get all the images we need now, in case we've got
# several pages this will save some CPU
self.logo = self.getImageFromZODB("logo")
def getImageFromZODB(self, name) :
"""Retrieves an Image from the ZODB, converts it to PIL,
and makes it 0.75 inch high.
"""
try :
# try to get it from ZODB
logo = getattr(self.parent.context, name)
except AttributeError :
# not found !
return None
# Convert it to PIL
image = ImageReader(BytesIO(logo.data))
(width, height) = image.getSize()
# scale it to be 0.75 inch high
multi = ((height + 0.0) / (0.75 * inch))
width = int(width / multi)
height = int(height / multi)
return ((width, height), image)
def beforeDrawPage(self, canvas, doc) :
"""Draws a logo and an contribution message on each page."""
canvas.saveState()
if self.logo is not None :
# draws the logo if it exists
((width, height), image) = self.logo
canvas.drawImage(image, inch, doc.pagesize[1] - inch, width, height)
canvas.setFont('Times-Roman', 10)
canvas.drawCentredString(inch + (doc.pagesize[0] - (1.5 * inch)) / 2, 0.25 * inch, "Contributed by Jerome Alet - alet@librelogiciel.com")
canvas.restoreState()
def __init__(self, context, filename) :
# save some datas
self.context = context
self.built = 0
self.objects = []
# we will build an in-memory document
# instead of creating an on-disk file.
self.report = BytesIO()
# initialise a PDF document using ReportLab's platypus
self.document = BaseDocTemplate(self.report)
# add our page template
# (we could add more than one, but I prefer to keep it simple)
self.document.addPageTemplates(self.MyPageTemplate(self))
# get the default style sheets
self.StyleSheet = styles.getSampleStyleSheet()
# then build a simple doc with ReportLab's platypus
sometext = "A sample script to show how to use ReportLab from within Zope"
url = self.escapexml(context.absolute_url())
urlfilename = self.escapexml(context.absolute_url() + '/%s' % filename)
self.append(Paragraph("Using ReportLab from within Zope", self.StyleSheet["Heading3"]))
self.append(Spacer(0, 10))
self.append(Paragraph("You launched it from : %s" % url, self.StyleSheet['Normal']))
self.append(Spacer(0, 40))
self.append(Paragraph("If possible, this report will be automatically saved as : %s" % urlfilename, self.StyleSheet['Normal']))
# generation du document PDF
self.document.build(self.objects)
self.built = 1
def __str__(self) :
"""Returns the PDF document as a string of text, or None if it's not ready yet."""
if self.built :
return self.report.getvalue()
else :
return None
def append(self, object) :
"""Appends an object to our platypus "story" (using ReportLab's terminology)."""
self.objects.append(object)
def escapexml(self, s) :
"""Escape some xml entities."""
s = s.strip()
s = s.replace("&", "&")
s = s.replace("<", "<")
return s.replace(">", ">")
def rlzope(self) :
"""A sample external method to show people how to use ReportLab from within Zope."""
try:
#
# which file/object name to use ?
# append ?name=xxxxx to rlzope's url to
# choose another name
filename = self.REQUEST.get("name", "dummy.pdf")
if filename[-4:] != '.pdf' :
filename = filename + '.pdf'
# tell the browser we send some PDF document
# with the requested filename
# get the document's content itself as a string of text
content = str(MyPDFDoc(self, filename))
# we will return it to the browser, but before that we also want to
# save it into the ZODB into the current folder
try :
self.manage_addFile(id = filename, file = content, title = "A sample PDF document produced with ReportLab", precondition = '', content_type = "application/pdf")
except :
# it seems an object with this name already exists in the ZODB:
# it's more secure to not replace it, since we could possibly
# destroy an important PDF document of this name.
pass
self.REQUEST.RESPONSE.setHeader('Content-Type', 'application/pdf')
self.REQUEST.RESPONSE.setHeader('Content-Disposition', 'attachment; filename=%s' % filename)
except:
import traceback, sys, cgi
content = sys.stdout = sys.stderr = BytesIO()
self.REQUEST.RESPONSE.setHeader('Content-Type', 'text/html')
traceback.print_exc()
sys.stdout = sys.__stdout__
sys.stderr = sys.__stderr__
content = '<html><head></head><body><pre>%s</pre></body></html>' % cgi.escape(content.getvalue())
# then we also return the PDF content to the browser
return content
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