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gen_cert.py
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# -*- coding: utf-8 -*-
import copy
import datetime
import gnupg
import math
import os
import re
import shutil
import StringIO
import uuid
from reportlab.platypus import Paragraph
from PyPDF2 import PdfFileWriter, PdfFileReader
from reportlab.lib import colors
from reportlab.lib.enums import TA_CENTER, TA_LEFT, TA_RIGHT
from reportlab.lib.fonts import addMapping
from reportlab.lib.pagesizes import A4, letter, landscape
from reportlab.lib.styles import ParagraphStyle
from reportlab.lib.units import mm
from reportlab.pdfbase import pdfmetrics
from reportlab.pdfbase.ttfonts import TTFont
from reportlab.pdfgen import canvas
from reportlab.pdfbase.pdfmetrics import stringWidth
from glob import glob
from HTMLParser import HTMLParser
import settings
import collections
import itertools
import logging.config
import reportlab.rl_config
import tempfile
import boto.s3
from boto.s3.key import Key
from bidi.algorithm import get_display
import arabic_reshaper
from opaque_keys.edx.keys import CourseKey
reportlab.rl_config.warnOnMissingFontGlyphs = 0
RE_ISODATES = re.compile("(?P<year>\d{4})-(?P<month>\d{2})-(?P<day>\d{2})")
TEMPLATE_DIR = settings.TEMPLATE_DIR
BUCKET = settings.CERT_BUCKET
CERT_KEY_ID = settings.CERT_KEY_ID
logging.config.dictConfig(settings.LOGGING)
log = logging.getLogger('certificates.' + __name__)
S3_CERT_PATH = 'downloads'
S3_VERIFY_PATH = getattr(settings, 'S3_VERIFY_PATH', 'cert')
TARGET_FILENAME = getattr(settings, 'CERT_FILENAME', 'Certificate.pdf')
TMP_GEN_DIR = getattr(settings, 'TMP_GEN_DIR', '/var/tmp/generated_certs')
CERTS_ARE_CALLED = getattr(settings, 'CERTS_ARE_CALLED', 'certificate')
CERTS_ARE_CALLED_PLURAL = getattr(settings, 'CERTS_ARE_CALLED_PLURAL', 'certificates')
# reduce logging level for gnupg
l = logging.getLogger('gnupg')
l.setLevel('WARNING')
# Register all fonts in the fonts/ dir; there are likely more fonts here than
# we need, but the performance hit is minimal -- especially since we only do
# this at import time.
#
# While registering fonts, build a table of the Unicode code points in each
# for use in font_for_string().
FONT_CHARACTER_TABLES = {}
for font_file in glob('{0}/fonts/*.ttf'.format(TEMPLATE_DIR)):
font_name = os.path.basename(os.path.splitext(font_file)[0])
ttf = TTFont(font_name, font_file)
FONT_CHARACTER_TABLES[font_name] = ttf.face.charToGlyph.keys()
pdfmetrics.registerFont(TTFont(font_name, font_file))
# These are small, so let's just load them at import time and keep them around
# so we don't have to keep doing the file I/o
BLANK_PDFS = {
'landscape-A4': PdfFileReader(file("{0}/blank.pdf".format(TEMPLATE_DIR), "rb")),
'landscape-letter': PdfFileReader(file("{0}/blank-letter.pdf".format(TEMPLATE_DIR), "rb")),
'portrait-A4': PdfFileReader(file("{0}/blank-portrait-A4.pdf".format(TEMPLATE_DIR), "rb")),
}
def prettify_isodate(isoformat_date):
"""Convert a string like '2012-02-02' to one like 'February 2nd, 2012'"""
m = RE_ISODATES.match(isoformat_date)
if not m:
raise TypeError("prettify_isodate called with incorrect date format: %s" % isoformat_date)
day_suffixes = {'1': 'st', '2': 'nd', '3': 'rd', '21': 'st', '22': 'nd', '23': 'rd', '31': 'st'}
months = ['January', 'February', 'March', 'April', 'May', 'June', 'July',
'August', 'September', 'October', 'November', 'December']
date = {'year': '', 'month': '', 'day': '', 'suffix': 'th'}
date['year'] = m.group('year')
date['month'] = months[int(m.group('month')) - 1]
date['day'] = m.group('day').lstrip('0')
date['suffix'] = day_suffixes.get(date['day'], 'th')
return "%(month)s %(day)s%(suffix)s, %(year)s" % date
def get_cert_date(calling_date_parameter, configured_date_parameter):
"""Get pertinent date for display on cert
- If cert passes a set date in 'calling_date_parameter', format that
- If using the "ROLLING" certs feature, use today's date
- If all else fails use 'configured_date_parameter' for date
"""
if calling_date_parameter:
date_value = prettify_isodate(calling_date_parameter)
elif configured_date_parameter == "ROLLING":
generate_date = datetime.date.today().isoformat()
date_value = prettify_isodate(generate_date)
else:
date_value = configured_date_parameter
date_string = u"{0}".format(date_value)
return date_string
def font_for_string(fontlist, ustring):
"""Determine the best font to render a string.
Given a list of fonts in priority order (that is, prettiest-first) and a
string which may or may not contain Unicode characters, test the string's
codepoints for glyph entries in the font, failing if any are missing and
returning the font name if it succeeds.
Font list a list of tuples where the first two items are the
human-readable font name, the on-disk filename, and one or more ignored
fields, e.g.:
[('font name', 'filename.ttf', 'ignored value', [...]), ...]
"""
# TODO: There's probably a way to do this by consulting reportlab that
# doesn't require re-loading the font files at all
ustring = unicode(ustring)
if fontlist and not ustring:
return fontlist[0]
for fonttuple in fontlist:
fonttag = fonttuple[0]
codepoints = FONT_CHARACTER_TABLES.get(fonttag, [])
if not codepoints:
warnstring = "Missing or invalid font specification {fonttag} " \
"rendering string '{ustring}'.\nFontlist: {fontlist}".format(
fonttag=fonttag,
ustring=ustring.encode('utf-8'),
fontlist=fontlist,
)
log.warning(warnstring)
continue
OK = reduce(lambda x, y: x and y, (ord(c) in codepoints for c in ustring))
if OK:
return fonttuple
# No font we tested supports this string, throw an exception.
# Then a human can and should install better fonts
raise ValueError("Nothing in fontlist supports string '{0}'. Fontlist: {1}".format(
ustring.encode('utf-8'),
repr(fontlist),
))
def autoscale_text(page, string, max_fontsize, max_leading, max_height, max_width, style):
"""Calculate font size and text placement given some base values
These values passed by reference are modified in this function, and not passed back:
- style.fontSize
- style.leading
"""
width = max_width + 1
height = max_height + 1
fontsize = max_fontsize
leading = max_leading
# Loop while size of text bigger than max allowed size as passed through
while width > max_width or height > max_height:
style.fontSize = fontsize
style.leading = leading
paragraph = Paragraph(string, style)
width, height = paragraph.wrapOn(page, max_width, max_height)
fontsize -= 1
leading -= 1
return paragraph
class CertificateGen(object):
"""Manages the pdf, signatures, and S3 bucket for course certificates."""
def __init__(self, course_id, template_pdf=None, aws_id=None, aws_key=None,
dir_prefix=None, long_org=None, long_course=None, issued_date=None):
"""Load a pdf template and initialize
Multiple certificates can be generated and uploaded for a single course.
course_id - Full course_id (ex: course-v1:MITx+6.00x+1T2015)
course_name - Human readable course title (ex: Introduction to Curling)
dir_prefix - Temporary directory for file generation. Ceritificates
and signatures are copied here temporarily before they
are uploaded to S3
template_pdf - (optional) Template (filename.pdf) to use for the
certificate generation.
aws_id - necessary for S3 uploads
aws_key - necessary for S3 uploads
course_id is used to look up extra data from settings.CERT_DATA,
including (but not necessarily limited to):
* LONG_ORG - long name for the organization
* ISSUED_DATE - month, year that corresponds to the
run of the course
* TEMPLATEFILE - the template pdf filename to use, equivalent to
template_pdf parameter
"""
if dir_prefix is None:
self._ensure_dir(TMP_GEN_DIR)
dir_prefix = tempfile.mkdtemp(prefix=TMP_GEN_DIR)
self._ensure_dir(dir_prefix)
self.dir_prefix = dir_prefix
self.aws_id = str(aws_id)
self.aws_key = str(aws_key)
cert_data = settings.CERT_DATA.get(course_id, {})
self.cert_data = cert_data
def interstitial_factory():
""" Generate default values for interstitial_texts defaultdict """
return itertools.repeat(cert_data.get('interstitial', {}).get('Pass', '')).next
# lookup long names from the course_id
try:
self.long_org = long_org or cert_data.get('LONG_ORG', '').encode('utf-8') or settings.DEFAULT_ORG
self.long_course = long_course or cert_data.get('LONG_COURSE', '').encode('utf-8')
self.issued_date = issued_date or cert_data.get('ISSUED_DATE', '').encode('utf-8') or 'ROLLING'
self.interstitial_texts = collections.defaultdict(interstitial_factory())
self.interstitial_texts.update(cert_data.get('interstitial', {}))
except KeyError:
log.critical("Unable to lookup long names for course {0}".format(course_id))
raise
# if COURSE or ORG is set in the configuration attempt to parse.
# This supports both new and old style course keys.
course_key = CourseKey.from_string(course_id)
self.course = cert_data.get('COURSE', course_key.course)
self.org = cert_data.get('ORG', course_key.org)
# get the template version based on the course settings in the
# certificates repo, with sensible defaults so that we can generate
# pdfs differently for the different templates
self.template_version = cert_data.get('VERSION', 1)
self.template_type = 'honor'
# search for certain keywords in the file name, we'll probably want to
# be better at parsing this later
# If TEMPLATEFILE is set in cert-data.yml, this value has top priority.
# Else if a value is passed in to the constructor (eg, from xqueue), it is used,
# Else, the filename is calculated from the version and course_id.
template_pdf = cert_data.get('TEMPLATEFILE', template_pdf)
template_prefix = '{0}/v{1}-cert-templates'.format(TEMPLATE_DIR, self.template_version)
template_pdf_filename = "{0}/certificate-template-{1}-{2}.pdf".format(template_prefix, self.org, self.course)
if template_pdf:
template_pdf_filename = "{0}/{1}".format(template_prefix, template_pdf)
if 'verified' in template_pdf:
self.template_type = 'verified'
try:
self.template_pdf = PdfFileReader(file(template_pdf_filename, "rb"))
except IOError as e:
log.critical("I/O error ({0}): {1} opening {2}".format(e.errno, e.strerror, template_pdf_filename))
raise
self.cert_label_singular = cert_data.get('CERTS_ARE_CALLED', CERTS_ARE_CALLED)
self.cert_label_plural = cert_data.get('CERTS_ARE_CALLED_PLURAL', CERTS_ARE_CALLED_PLURAL)
self.course_association_text = cert_data.get('COURSE_ASSOCIATION_TEXT', 'a course of study')
def delete_certificate(self, delete_download_uuid, delete_verify_uuid):
# TODO remove/archive an existing certificate
raise NotImplementedError
def create_and_upload(
self,
name,
upload=settings.S3_UPLOAD,
cleanup=True,
copy_to_webroot=settings.COPY_TO_WEB_ROOT,
cert_web_root=settings.CERT_WEB_ROOT,
grade=None,
designation=None,
):
"""
name - Full name that will be on the certificate
upload - Upload to S3 (defaults to True)
set upload to False if you do not want to upload to S3,
this will also keep temporary files that are created.
returns a tuple containing the UUIDs for download, verify and
the full download URL. If upload is set to False
download_url in the return will be None
return (download_uuid, verify_uuid, download_url)
verify_uuid will be None if there is no verification signature
"""
download_uuid = None
verify_uuid = None
download_url = None
s3_conn = None
bucket = None
certificates_path = os.path.join(self.dir_prefix, S3_CERT_PATH)
verify_path = os.path.join(self.dir_prefix, S3_VERIFY_PATH)
(download_uuid, verify_uuid, download_url) = self._generate_certificate(student_name=name,
download_dir=certificates_path,
verify_dir=verify_path,
grade=grade,
designation=designation,)
# upload generated certificate and verification files to S3,
# or copy them to the web root. Or both.
my_certs_path = os.path.join(certificates_path, download_uuid)
my_verify_path = os.path.join(verify_path, verify_uuid)
if upload:
s3_conn = boto.connect_s3(settings.CERT_AWS_ID, settings.CERT_AWS_KEY)
bucket = s3_conn.get_bucket(BUCKET)
if upload or copy_to_webroot:
for subtree in (my_certs_path, my_verify_path):
for dirpath, dirnames, filenames in os.walk(subtree):
for filename in filenames:
local_path = os.path.join(dirpath, filename)
dest_path = os.path.relpath(local_path, start=self.dir_prefix)
publish_dest = os.path.join(cert_web_root, dest_path)
if upload:
try:
key = Key(bucket, name=dest_path)
key.set_contents_from_filename(local_path, policy='public-read')
except:
raise
else:
log.info("uploaded {local} to {s3path}".format(local=local_path, s3path=dest_path))
if copy_to_webroot:
try:
dirname = os.path.dirname(publish_dest)
if not os.path.exists(dirname):
os.makedirs(dirname)
shutil.copy(local_path, publish_dest)
except:
raise
else:
log.info("published {local} to {web}".format(local=local_path, web=publish_dest))
if cleanup:
for working_dir in (certificates_path, verify_path):
if os.path.exists(working_dir):
shutil.rmtree(working_dir)
return (download_uuid, verify_uuid, download_url)
def _generate_certificate(
self,
student_name,
download_dir,
verify_dir,
filename=TARGET_FILENAME,
grade=None,
designation=None,
):
"""Generate a certificate PDF, signature and validation html files.
return (download_uuid, verify_uuid, download_url)
"""
versionmap = {
1: self._generate_v1_certificate,
2: self._generate_v2_certificate,
'MIT_PE': self._generate_mit_pe_certificate,
'stanford': self._generate_stanford_SOA,
'3_dynamic': self._generate_v3_dynamic_certificate,
'stanford_cme': self._generate_stanford_cme_certificate,
}
# TODO: we should be taking args, kwargs, and passing those on to our callees
return versionmap[self.template_version](
student_name,
download_dir,
verify_dir,
filename,
grade,
designation,
)
def _generate_v1_certificate(
self,
student_name,
download_dir,
verify_dir,
filename=TARGET_FILENAME,
grade=None,
designation=None,
):
# A4 page size is 297mm x 210mm
verify_uuid = uuid.uuid4().hex
download_uuid = uuid.uuid4().hex
download_url = "{base_url}/{cert}/{uuid}/{file}".format(
base_url=settings.CERT_DOWNLOAD_URL,
cert=S3_CERT_PATH, uuid=download_uuid, file=filename)
filename = os.path.join(download_dir, download_uuid, filename)
# This file is overlaid on the template certificate
overlay_pdf_buffer = StringIO.StringIO()
c = canvas.Canvas(overlay_pdf_buffer, pagesize=landscape(A4))
# 0 0 - normal
# 0 1 - italic
# 1 0 - bold
# 1 1 - italic and bold
addMapping('OpenSans-Light', 0, 0, 'OpenSans-Light')
addMapping('OpenSans-Light', 0, 1, 'OpenSans-LightItalic')
addMapping('OpenSans-Light', 1, 0, 'OpenSans-Bold')
addMapping('OpenSans-Regular', 0, 0, 'OpenSans-Regular')
addMapping('OpenSans-Regular', 0, 1, 'OpenSans-Italic')
addMapping('OpenSans-Regular', 1, 0, 'OpenSans-Bold')
addMapping('OpenSans-Regular', 1, 1, 'OpenSans-BoldItalic')
styleArial = ParagraphStyle(name="arial", leading=10, fontName='Arial Unicode')
styleOpenSans = ParagraphStyle(name="opensans-regular", leading=10, fontName='OpenSans-Regular')
styleOpenSansLight = ParagraphStyle(name="opensans-light", leading=10, fontName='OpenSans-Light')
# Text is overlayed top to bottom
# * Issued date (top right corner)
# * "This is to certify that"
# * Student's name
# * "successfully completed"
# * Course name
# * "a course of study.."
# * honor code url at the bottom
WIDTH = 297 # width in mm (A4)
HEIGHT = 210 # hight in mm (A4)
LEFT_INDENT = 49 # mm from the left side to write the text
RIGHT_INDENT = 49 # mm from the right side for the CERTIFICATE
# CERTIFICATE
styleOpenSansLight.fontSize = 19
styleOpenSansLight.leading = 10
styleOpenSansLight.textColor = colors.Color(0.302, 0.306, 0.318)
styleOpenSansLight.alignment = TA_LEFT
paragraph_string = "CERTIFICATE"
# Right justified so we compute the width
width = stringWidth(
paragraph_string,
'OpenSans-Light',
19,
) / mm
paragraph = Paragraph("{0}".format(
paragraph_string), styleOpenSansLight)
paragraph.wrapOn(c, WIDTH * mm, HEIGHT * mm)
paragraph.drawOn(c, (WIDTH - RIGHT_INDENT - width) * mm, 163 * mm)
# Issued ..
styleOpenSansLight.fontSize = 12
styleOpenSansLight.leading = 10
styleOpenSansLight.textColor = colors.Color(
0.302, 0.306, 0.318)
styleOpenSansLight.alignment = TA_LEFT
paragraph_string = "Issued {0}".format(self.issued_date)
# Right justified so we compute the width
width = stringWidth(
paragraph_string,
'OpenSans-LightItalic',
12,
) / mm
paragraph = Paragraph("<i>{0}</i>".format(
paragraph_string), styleOpenSansLight)
paragraph.wrapOn(c, WIDTH * mm, HEIGHT * mm)
paragraph.drawOn(c, (WIDTH - RIGHT_INDENT - width) * mm, 155 * mm)
# This is to certify..
styleOpenSansLight.fontSize = 12
styleOpenSansLight.leading = 10
styleOpenSansLight.textColor = colors.Color(
0.302, 0.306, 0.318)
styleOpenSansLight.alignment = TA_LEFT
paragraph_string = "This is to certify that"
paragraph = Paragraph(paragraph_string, styleOpenSansLight)
paragraph.wrapOn(c, WIDTH * mm, HEIGHT * mm)
paragraph.drawOn(c, LEFT_INDENT * mm, 132.5 * mm)
# Student name
# default is to use the DejaVu font for the name,
# will fall back to Arial if there are
# unusual characters
style = styleOpenSans
style.leading = 10
width = stringWidth(student_name.decode('utf-8'), 'OpenSans-Bold', 34) / mm
paragraph_string = "<b>{0}</b>".format(student_name)
if self._use_unicode_font(student_name):
style = styleArial
width = stringWidth(student_name.decode('utf-8'), 'Arial Unicode', 34) / mm
# There is no bold styling for Arial :(
paragraph_string = "{0}".format(student_name)
# We will wrap at 200mm in, so if we reach the end (200-47)
# decrease the font size
if width > 153:
style.fontSize = 18
nameYOffset = 121.5
else:
style.fontSize = 34
nameYOffset = 124.5
style.textColor = colors.Color(
0, 0.624, 0.886)
style.alignment = TA_LEFT
paragraph = Paragraph(paragraph_string, style)
paragraph.wrapOn(c, 200 * mm, 214 * mm)
paragraph.drawOn(c, LEFT_INDENT * mm, nameYOffset * mm)
# Successfully completed
styleOpenSansLight.fontSize = 12
styleOpenSansLight.leading = 10
styleOpenSansLight.textColor = colors.Color(
0.302, 0.306, 0.318)
styleOpenSansLight.alignment = TA_LEFT
paragraph_string = "successfully completed"
if '7.00x' in self.course:
paragraph_string = "successfully completed the inaugural offering of"
else:
paragraph_string = "successfully completed"
paragraph = Paragraph(paragraph_string, styleOpenSansLight)
paragraph.wrapOn(c, WIDTH * mm, HEIGHT * mm)
paragraph.drawOn(c, LEFT_INDENT * mm, 108 * mm)
# Course name
# styleOpenSans.fontName = 'OpenSans-BoldItalic'
if 'PH207x' in self.course:
styleOpenSans.fontSize = 18
styleOpenSans.leading = 21
elif '4.01x' in self.course:
styleOpenSans.fontSize = 20
styleOpenSans.leading = 10
elif 'Stat2.1x' in self.course:
styleOpenSans.fontSize = 20
styleOpenSans.leading = 10
elif 'CS191x' in self.course:
styleOpenSans.fontSize = 20
styleOpenSans.leading = 10
elif '6.00x' in self.course:
styleOpenSans.fontSize = 20
styleOpenSans.leading = 21
elif 'PH278x' in self.course:
styleOpenSans.fontSize = 20
styleOpenSans.leading = 10
else:
styleOpenSans.fontSize = 24
styleOpenSans.leading = 10
styleOpenSans.textColor = colors.Color(
0, 0.624, 0.886)
styleOpenSans.alignment = TA_LEFT
paragraph_string = u"<b><i>{0}: {1}</i></b>".format(
self.course, self.long_course.decode('utf-8'))
paragraph = Paragraph(paragraph_string, styleOpenSans)
# paragraph.wrapOn(c, WIDTH * mm, HEIGHT * mm)
if 'PH207x' in self.course:
paragraph.wrapOn(c, 180 * mm, HEIGHT * mm)
paragraph.drawOn(c, LEFT_INDENT * mm, 91 * mm)
elif '6.00x' in self.course:
paragraph.wrapOn(c, WIDTH * mm, HEIGHT * mm)
paragraph.drawOn(c, LEFT_INDENT * mm, 95 * mm)
else:
paragraph.wrapOn(c, WIDTH * mm, HEIGHT * mm)
paragraph.drawOn(c, LEFT_INDENT * mm, 99 * mm)
# A course of study..
styleOpenSansLight.fontSize = 12
styleOpenSansLight.textColor = colors.Color(
0.302, 0.306, 0.318)
styleOpenSansLight.alignment = TA_LEFT
paragraph_string = "a course of study offered by <b>{0}</b>" \
", an online learning<br /><br />initiative of " \
"<b>{1}</b> through <b>edX</b>.".format(
self.org, self.long_org.decode('utf-8'))
paragraph = Paragraph(paragraph_string, styleOpenSansLight)
paragraph.wrapOn(c, WIDTH * mm, HEIGHT * mm)
paragraph.drawOn(c, LEFT_INDENT * mm, 78 * mm)
# Honor code
styleOpenSansLight.fontSize = 7
styleOpenSansLight.leading = 10
styleOpenSansLight.textColor = colors.Color(
0.302, 0.306, 0.318)
styleOpenSansLight.alignment = TA_CENTER
paragraph_string = "HONOR CODE CERTIFICATE<br/>" \
"*Authenticity of this certificate can be verified at " \
"<a href='{verify_url}/{verify_path}/{verify_uuid}'>" \
"{verify_url}/{verify_path}/{verify_uuid}</a>"
paragraph_string = paragraph_string.format(
verify_url=settings.CERT_VERIFY_URL,
verify_path=S3_VERIFY_PATH,
verify_uuid=verify_uuid)
paragraph = Paragraph(paragraph_string, styleOpenSansLight)
paragraph.wrapOn(c, WIDTH * mm, HEIGHT * mm)
paragraph.drawOn(c, 0 * mm, 28 * mm)
c.showPage()
c.save()
# Merge the overlay with the template, then write it to file
output = PdfFileWriter()
overlay = PdfFileReader(overlay_pdf_buffer)
# We need a page to overlay on.
# So that we don't have to open the template
# several times, we open a blank pdf several times instead
# (much faster)
final_certificate = copy.copy(BLANK_PDFS['landscape-A4']).getPage(0)
final_certificate.mergePage(self.template_pdf.getPage(0))
final_certificate.mergePage(overlay.getPage(0))
output.addPage(final_certificate)
self._ensure_dir(filename)
outputStream = file(filename, "wb")
output.write(outputStream)
outputStream.close()
self._generate_verification_page(
student_name,
filename,
verify_dir,
verify_uuid,
download_url
)
return (download_uuid, verify_uuid, download_url)
def _generate_v2_certificate(
self,
student_name,
download_dir,
verify_dir,
filename=TARGET_FILENAME,
grade=None,
designation=None,
):
"""
We have a new set of certificates that we want to generate which means brand new generation of certs
"""
# 8.5x11 page size 279.4mm x 215.9mm
WIDTH = 279 # width in mm (8.5x11)
HEIGHT = 216 # height in mm (8.5x11)
verify_uuid = uuid.uuid4().hex
download_uuid = uuid.uuid4().hex
download_url = "{base_url}/{cert}/{uuid}/{file}".format(
base_url=settings.CERT_DOWNLOAD_URL,
cert=S3_CERT_PATH, uuid=download_uuid, file=filename
)
filename = os.path.join(download_dir, download_uuid, filename)
# This file is overlaid on the template certificate
overlay_pdf_buffer = StringIO.StringIO()
c = canvas.Canvas(overlay_pdf_buffer, pagesize=landscape(letter))
styleOpenSans = ParagraphStyle(name="opensans-regular", leading=10,
fontName='OpenSans-Regular')
styleArial = ParagraphStyle(name="arial", leading=10,
fontName='Arial Unicode')
# Text is overlayed top to bottom
# * Issued date (top right corner)
# * "This is to certify that"
# * Student's name
# * "successfully completed"
# * Course name
# * "a course of study.."
# * honor code url at the bottom
# New things below
# STYLE: typeface assets
addMapping('AvenirNext-Regular', 0, 0, 'AvenirNext-Regular')
addMapping('AvenirNext-DemiBold', 1, 0, 'AvenirNext-DemiBold')
# STYLE: grid/layout
LEFT_INDENT = 23 # mm from the left side to write the text
MAX_WIDTH = 150 # maximum width on the content in the cert, used for wrapping
# STYLE: template-wide typography settings
style_type_metacopy_size = 13
style_type_metacopy_leading = 10
style_type_footer_size = 8
style_type_name_size = 36
style_type_name_leading = 53
style_type_name_med_size = 28
style_type_name_med_leading = 41
style_type_name_small_size = 22
style_type_name_small_leading = 27
style_type_course_size = 24
style_type_course_leading = 28
style_type_course_small_size = 16
style_type_course_small_leading = 20
# STYLE: template-wide color settings
style_color_metadata = colors.Color(0.541176, 0.509804, 0.560784)
style_color_name = colors.Color(0.000000, 0.000000, 0.000000)
# STYLE: positioning
pos_metacopy_title_y = 120
pos_metacopy_achivement_y = 88
pos_metacopy_org_y = 50
pos_name_y = 94
pos_name_med_y = 95
pos_name_small_y = 95
pos_name_no_wrap_offset_y = 2
pos_course_y = 68
pos_course_small_y = 66
pos_course_no_wrap_offset_y = 5
pos_footer_url_x = 83
pos_footer_url_y = 20
pos_footer_date_x = LEFT_INDENT
pos_footer_date_y = 20
# STYLE: verified settings
v_style_color_course = colors.Color(0.701961, 0.231373, 0.400000)
# HTML Parser ####
# Since the final string is HTML in a PDF we need to un-escape the html
# when calculating the string width.
html = HTMLParser()
# ELEM: Metacopy
styleAvenirNext = ParagraphStyle(name="avenirnext-regular", fontName='AvenirNext-Regular')
styleAvenirNext.alignment = TA_LEFT
styleAvenirNext.fontSize = style_type_metacopy_size
styleAvenirNext.leading = style_type_metacopy_leading
styleAvenirNext.textColor = style_color_metadata
# ELEM: Metacopy - Title: This is to certify that
if self.template_type == 'verified':
y_offset = pos_metacopy_title_y
paragraph_string = 'This is to certify that'
paragraph = Paragraph(paragraph_string, styleAvenirNext)
paragraph.wrapOn(c, WIDTH * mm, HEIGHT * mm)
paragraph.drawOn(c, LEFT_INDENT * mm, y_offset * mm)
# ELEM: Student Name
# default is to use Avenir for the name,
# will fall back to Arial if there are
# unusual characters
y_offset_name = pos_name_y
y_offset_name_med = pos_name_med_y
y_offset_name_small = pos_name_small_y
styleAvenirStudentName = ParagraphStyle(name="avenirnext-demi", fontName='AvenirNext-DemiBold')
styleAvenirStudentName.leading = style_type_name_small_size
style = styleAvenirStudentName
html_student_name = html.unescape(student_name)
larger_width = stringWidth(html_student_name.decode('utf-8'),
'AvenirNext-DemiBold', style_type_name_size) / mm
smaller_width = stringWidth(
html_student_name.decode('utf-8'),
'AvenirNext-DemiBold', style_type_name_small_size) / mm
# TODO: get all strings working reshaped and handling bi-directional strings
paragraph_string = arabic_reshaper.reshape(student_name.decode('utf-8'))
paragraph_string = get_display(paragraph_string)
# Avenir only supports Latin-1
# Switch to using OpenSans if we can
if self._use_non_latin(student_name):
style = styleOpenSans
larger_width = stringWidth(html_student_name.decode('utf-8'),
'OpenSans-Regular', style_type_name_size) / mm
# if we can't use OpenSans, use Arial
if self._use_unicode_font(student_name):
style = styleArial
larger_width = stringWidth(html_student_name.decode('utf-8'),
'Arial Unicode', style_type_name_size) / mm
# if the name is too long, shrink the font size
if larger_width < MAX_WIDTH:
style.fontSize = style_type_name_size
style.leading = style_type_name_leading
y_offset = y_offset_name
elif smaller_width < MAX_WIDTH:
y_offset = y_offset_name_med + pos_name_no_wrap_offset_y
style.fontSize = style_type_name_med_size
style.leading = style_type_name_med_leading
else:
y_offset = y_offset_name_small
style.fontSize = style_type_name_small_size
style.leading = style_type_name_small_leading
style.textColor = style_color_name
style.alignment = TA_LEFT
paragraph = Paragraph(paragraph_string, style)
paragraph.wrapOn(c, MAX_WIDTH * mm, HEIGHT * mm)
paragraph.drawOn(c, LEFT_INDENT * mm, y_offset * mm)
# ELEM: Metacopy - Achievement: successfully completed and received a passing grade in
y_offset = pos_metacopy_achivement_y
paragraph_string = 'successfully completed and received a passing grade in'
paragraph = Paragraph("{0}".format(paragraph_string), styleAvenirNext)
paragraph.wrapOn(c, WIDTH * mm, HEIGHT * mm)
paragraph.drawOn(c, LEFT_INDENT * mm, y_offset * mm)
# ELEM: Course Name
y_offset_larger = pos_course_y
y_offset_smaller = pos_course_small_y
styleAvenirCourseName = ParagraphStyle(name="avenirnext-demi", fontName='AvenirNext-DemiBold')
styleAvenirCourseName.textColor = style_color_name
if self.template_type == 'verified':
styleAvenirCourseName.textColor = v_style_color_course
paragraph_string = u"{0}: {1}".format(self.course, self.long_course)
html_paragraph_string = html.unescape(paragraph_string)
larger_width = stringWidth(html_paragraph_string.decode('utf-8'),
'AvenirNext-DemiBold', style_type_course_size) / mm
smaller_width = stringWidth(html_paragraph_string.decode('utf-8'),
'AvenirNext-DemiBold', style_type_course_small_size) / mm
if larger_width < MAX_WIDTH:
styleAvenirCourseName.fontSize = style_type_course_size
styleAvenirCourseName.leading = style_type_course_leading
y_offset = y_offset_larger
elif smaller_width < MAX_WIDTH:
styleAvenirCourseName.fontSize = style_type_course_small_size
styleAvenirCourseName.leading = style_type_course_small_leading
y_offset = y_offset_smaller + pos_course_no_wrap_offset_y
else:
styleAvenirCourseName.fontSize = style_type_course_small_size
styleAvenirCourseName.leading = style_type_course_small_leading
y_offset = y_offset_smaller
styleAvenirCourseName.alignment = TA_LEFT
paragraph = Paragraph(paragraph_string, styleAvenirCourseName)
paragraph.wrapOn(c, MAX_WIDTH * mm, HEIGHT * mm)
paragraph.drawOn(c, LEFT_INDENT * mm, y_offset * mm)
# ELEM: Metacopy - Org: a course of study...
y_offset = pos_metacopy_org_y
paragraph_string = "{2} offered by {0}" \
", an online learning<br /><br />initiative of " \
"{1} through edX.".format(
self.org, self.long_org.decode('utf-8'), self.course_association_text)
paragraph = Paragraph(paragraph_string, styleAvenirNext)
paragraph.wrapOn(c, WIDTH * mm, HEIGHT * mm)
paragraph.drawOn(c, LEFT_INDENT * mm, y_offset * mm)
# ELEM: Footer
styleAvenirFooter = ParagraphStyle(name="avenirnext-demi", fontName='AvenirNext-DemiBold')
styleAvenirFooter.alignment = TA_LEFT
styleAvenirFooter.fontSize = style_type_footer_size
# ELEM: Footer - Issued on Date
x_offset = pos_footer_date_x
y_offset = pos_footer_date_y
paragraph_string = "Issued {0}".format(self.issued_date)
# Right justified so we compute the width
paragraph = Paragraph("{0}".format(
paragraph_string), styleAvenirFooter)
paragraph.wrapOn(c, WIDTH * mm, HEIGHT * mm)
paragraph.drawOn(c, LEFT_INDENT * mm, y_offset * mm)
# ELEM: Footer - Verify Authenticity URL
y_offset = pos_footer_url_y
x_offset = pos_footer_url_x
paragraph_string = "<a href='https://{bucket}/{verify_path}/{verify_uuid}'>" \
"https://{bucket}/{verify_path}/{verify_uuid}</a>"
paragraph_string = paragraph_string.format(bucket=BUCKET,
verify_path=S3_VERIFY_PATH,
verify_uuid=verify_uuid)
paragraph = Paragraph(paragraph_string, styleAvenirFooter)
paragraph.wrapOn(c, WIDTH * mm, HEIGHT * mm)
paragraph.drawOn(c, x_offset * mm, y_offset * mm)
c.showPage()
c.save()
# Merge the overlay with the template, then write it to file
output = PdfFileWriter()
overlay = PdfFileReader(overlay_pdf_buffer)
# We need a page to overlay on.
# So that we don't have to open the template
# several times, we open a blank pdf several times instead
# (much faster)
final_certificate = copy.copy(BLANK_PDFS['landscape-letter']).getPage(0)
final_certificate.mergePage(self.template_pdf.getPage(0))
final_certificate.mergePage(overlay.getPage(0))
output.addPage(final_certificate)
self._ensure_dir(filename)
outputStream = file(filename, "wb")
output.write(outputStream)
outputStream.close()
self._generate_verification_page(
student_name,
filename,
verify_dir,
verify_uuid,
download_url
)
return (download_uuid, verify_uuid, download_url)
def _generate_mit_pe_certificate(
self,
student_name,
download_dir,
verify_dir,
filename=TARGET_FILENAME,
grade=None,
designation=None,
):
"""
Generate the BigDataX certs
"""
# 8.5x11 page size 279.4mm x 215.9mm
WIDTH = 279 # width in mm (8.5x11)
HEIGHT = 216 # height in mm (8.5x11)
download_uuid = uuid.uuid4().hex
verify_uuid = uuid.uuid4().hex
download_url = "{base_url}/{cert}/{uuid}/{file}".format(
base_url=settings.CERT_DOWNLOAD_URL,
cert=S3_CERT_PATH, uuid=download_uuid, file=filename
)
filename = os.path.join(download_dir, download_uuid, filename)
# This file is overlaid on the template certificate
overlay_pdf_buffer = StringIO.StringIO()
c = canvas.Canvas(overlay_pdf_buffer)
c.setPageSize((WIDTH * mm, HEIGHT * mm))
# STYLE: grid/layout
LEFT_INDENT = 10 # mm from the left side to write the text
MAX_WIDTH = 260 # maximum width on the content in the cert, used for wrapping
# STYLE: template-wide typography settings
style_type_name_size = 36
style_type_name_leading = 53
style_type_name_med_size = 22
style_type_name_med_leading = 27
style_type_name_small_size = 18
style_type_name_small_leading = 21
# STYLE: template-wide color settings