Begin upgrading the PDF generation

backend/donations/models.py

@@ -21,6 +21,11 @@ def ngo_directory_path(subdir, instance, filename) -> str:
     return "ngo-{0}-{1}/{2}/{3}".format(instance.pk, ngo_code[:10], subdir, filename)
 
 
+def year_directory_path(subdir, instance, filename) -> str:
+    timestamp = timezone.now()
+    return "{0}/{1}/{2}/{3}".format(subdir, timestamp.date().year, instance.pk, filename)
+
+
 class Ngo(models.Model):
     # DEFAULT_NGO_LOGO = "https://storage.googleapis.com/redirectioneaza/logo_bw.png"
 
@@ -197,6 +202,13 @@ class Donor(models.Model):
     filename = models.CharField(verbose_name=_("filename"), blank=True, null=False, default="", max_length=100)
     has_signed = models.BooleanField(verbose_name=_("has signed"), db_index=True, default=False)
 
+    pdf_file = models.FileField(
+        verbose_name=_("PDF file"),
+        blank=True,
+        null=False,
+        upload_to=partial(year_directory_path, "documents"),
+    )
+
     date_created = models.DateTimeField(verbose_name=_("date created"), db_index=True, auto_now_add=timezone.now)
 
     class Meta:

backend/donations/pdf.py

@@ -0,0 +1,298 @@
+
+import os
+from io import StringIO
+import base64
+import tempfile
+
+from io import BytesIO
+from datetime import datetime
+
+from pypdf import PdfFileWriter, PdfFileReader
+from reportlab.pdfgen import canvas
+from reportlab.lib.utils import ImageReader
+from reportlab.lib.pagesizes import A4
+from reportlab.graphics import renderPDF
+
+from reportlab.pdfbase import pdfmetrics
+from reportlab.pdfbase.ttfonts import TTFont
+from svglib.svglib import svg2rlg
+
+from logging import info
+
+abs_path = os.path.abspath(os.path.join(os.path.dirname(__file__), os.path.pardir))
+font_path = abs_path + "/static/font/opensans.ttf"
+pdfmetrics.registerFont(TTFont('OpenSans', font_path))
+
+default_font_size = 15
+form_image_path = "/static/images/formular-2021.jpg"
+
+
+def format_ngo_account(ngo_account):
+    # remove white spaces from account
+    ngo_account = ngo_account.replace(' ', '')
+
+    account = ''
+    for i, l in enumerate(ngo_account):
+        account += l
+        if (i + 1) % 4 == 0:
+            account += " "
+
+    return account
+
+def add_donor_data(c, person):
+
+    donor_block_x = 681
+
+    # the first name
+    if len(person["first_name"]) > 18:
+        c.setFontSize(12)
+
+    c.drawString(75, donor_block_x, person["first_name"])
+    c.setFontSize(default_font_size)
+
+    # father's first letter
+    c.drawString(300, donor_block_x, person["father"])
+
+    # the last name
+    last_name = person["last_name"]
+    if len(last_name) > 34:
+        c.setFontSize(10)
+
+    c.drawString(75, donor_block_x - 22, last_name)
+
+
+    # =======================================
+    # THIRD ROW
+    # 
+    third_row_x = donor_block_x - 45
+
+    # the street
+    street = person["street"]
+
+    if len(street) > 40:
+        c.setFontSize(8)
+    elif len(street) in range(36, 41):
+        c.setFontSize(10)
+    elif len(street) in range(24, 36):
+        c.setFontSize(11)
+
+    c.drawString(67, third_row_x, street)
+    c.setFontSize(default_font_size)
+
+    # numar
+    if len(person["number"]) > 5:
+        c.setFontSize(8)
+    elif len(person["number"]) > 3:
+        c.setFontSize(10)
+
+    c.drawString(289, third_row_x, person["number"])
+    c.setFontSize(default_font_size)
+
+    # 
+    # =======================================
+
+    # =======================================
+    # FOURTH ROW
+    fourth_row_x = donor_block_x - 67
+
+    c.setFontSize(14)
+    # bloc
+    c.drawString(49, fourth_row_x, person["bl"])
+    # scara
+    c.drawString(108, fourth_row_x, person["sc"])
+
+    # etaj
+    c.drawString(150, fourth_row_x, person["et"])
+
+    # apartament
+    c.drawString(185, fourth_row_x, person["ap"])
+
+    # judet
+    if len(person["county"]) <= 12:
+        c.setFontSize(12)
+    else:
+        c.setFontSize(8)
+
+    c.drawString(255, fourth_row_x, person["county"])
+    c.setFontSize(default_font_size)
+    # 
+    # =======================================
+
+
+    # oras
+    c.drawString(69, donor_block_x - 90, person["city"])
+
+    c.setFontSize(16)
+
+    # cnp
+    start_x = 336
+    for letter in person["cnp"]:
+        c.drawString(start_x, donor_block_x - 10, letter)
+        start_x += 18.5
+
+
+    # email
+    start_email_x = 368
+    if person['email']:
+        if len(person['email']) < 32:
+            c.setFontSize(12)
+        elif len(person['email']) < 40:
+            c.setFontSize(10)
+        else:
+            c.setFontSize(8)
+
+        c.drawString(start_email_x, third_row_x + 14, person['email'])
+
+    # telephone
+    if person['tel']:
+        c.setFontSize(12)
+        c.drawString(start_email_x, third_row_x - 15, person['tel'])
+
+
+    c.setFontSize(default_font_size)
+
+def add_ngo_data(c, ong):
+    start_ong_y = 449
+
+    # the x mark
+    c.drawString(219, start_ong_y, "x")
+
+    if ong.get('two_years'):
+        c.drawString(325, start_ong_y - 21, "x")
+
+    # the cif code
+    c.setFontSize(9)
+    c.drawString(250, start_ong_y - 41, ong["cif"])
+
+    # the name
+    org_name = ong["name"]
+    if len(org_name) > 79:
+        c.setFontSize(9)
+    elif len(org_name) > 65:
+        c.setFontSize(12)
+
+    c.drawString(186, start_ong_y - 64, org_name.encode('utf-8'))
+
+    c.setFontSize(11)
+
+    # the bank account
+    account = format_ngo_account(ong["account"])
+    c.drawString(110, start_ong_y - 86, account)
+
+    if ong.get('percent'):
+        c.drawString(146, start_ong_y - 108, ong.get('percent'))
+
+def create_pdf(person = {}, ong = {}):
+    """method used to create the pdf
+
+    person: dict with the person's data 
+        first_name
+        father
+        last_name
+        email
+        tel
+        street
+        number
+        bl
+        sc
+        et
+        ap
+        county
+        city
+        cnp
+
+
+    ong: dict with the ngo's data
+        name
+        cif
+        account
+    """
+
+    # packet = StringIO.StringIO()
+    # we could also use StringIO
+    packet = tempfile.TemporaryFile(mode='w+b')
+
+    c = canvas.Canvas(packet, A4)
+    width, height = A4
+
+    # add the image as background
+    background = ImageReader( abs_path + form_image_path )
+    c.drawImage(background, 0, 0, width=width, height=height)
+
+    c.setFont('OpenSans', default_font_size)
+    c.setFontSize(default_font_size)
+
+    # the year
+    # this is the previous year
+    year = str( datetime.now().year - 1 )
+    start_x = 305
+    for letter in year:
+        c.drawString(start_x, 736, letter)
+        start_x += 18
+
+    # DRAW DONOR DATA
+    if person.get('first_name'):
+        add_donor_data(c, person)
+
+    add_ngo_data(c, ong)
+
+    c.save()
+
+    # go to the beginning of the file
+    packet.seek(0)
+    # packet.type = "application/pdf"
+
+    return packet
+
+def add_signature(pdf, image):
+
+    pdf_string = StringIO.StringIO(pdf)
+    existing_pdf = PdfFileReader(pdf_string)
+
+    packet = tempfile.TemporaryFile(mode='w+b')
+
+    # init pdf canvas
+    c = canvas.Canvas(packet, A4)
+
+    # add the image as background
+    # remove the header added by javascript
+    image = image.split(',')[1]
+    # make sure the string has the right padding
+    image = image + '=' * (-len(image) % 4)
+    base_image = base64.b64decode(image)
+    byte_image = BytesIO(base_image)
+    # make this a svg2rlg object
+    drawing = svg2rlg(byte_image)
+
+    # we used to use width for scaling down but we move to height
+    # new_width = 90
+
+    new_height = 30
+    scaled_down = (new_height / drawing.height)
+
+    # we want to scale the image down and stil keep it's aspect ratio
+    # the image might have dimensions of 750 x 200
+    drawing.scale(scaled_down, scaled_down)
+
+    # add it to the PDF
+    renderPDF.draw(drawing, c, 166, 134)
+
+    c.save()
+    packet.seek(0)
+
+    new_pdf = PdfFileReader(packet)
+
+    page = existing_pdf.getPage(0)
+    page.mergePage(new_pdf.getPage(0))
+
+    output = PdfFileWriter()
+    output.addPage(page)
+
+    outputStream = tempfile.TemporaryFile(mode='w+b')
+    output.write(outputStream)
+
+    outputStream.seek(0)
+
+    packet.close()
+
+    return outputStream