report_qweb_pdf_watermark (OCA#86)

report_qweb_pdf_watermark/README.rst

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+.. image:: https://img.shields.io/badge/licence-AGPL--3-blue.svg
+    :target: http://www.gnu.org/licenses/agpl-3.0-standalone.html
+    :alt: License: AGPL-3
+
+=============
+Pdf watermark
+=============
+
+This module was written to add watermarks (backgrounds) to PDF reports.
+
+This is necessary because of the way wkhtmltopdf handles headers and footers, in the current versions if quite impossible to have a background for the complete page.
+
+Usage
+=====
+
+To use this module, you need to:
+
+#. go to your report
+#. select a PDF or image to use as watermark. Note that resolutions and size must match, otherwise you'll have funny results
+#. advanced users (members of group technical settings) can also fill in an expression that returns the data (base64 encoded) to be used as watermark
+
+.. image:: https://odoo-community.org/website/image/ir.attachment/5784_f2813bd/datas
+    :alt: Try me on Runbot
+    :target: https://runbot.odoo-community.org/runbot/143/8.0
+
+Bug Tracker
+===========
+
+Bugs are tracked on `GitHub Issues
+<https://github.com/OCA/reporting-engine/issues>`_. In case of trouble, please
+check there if your issue has already been reported. If you spotted it first,
+help us smashing it by providing a detailed and welcomed feedback.
+
+Credits
+=======
+
+Images
+------
+
+* Odoo Community Association: `Icon <https://github.com/OCA/maintainer-tools/blob/master/template/module/static/description/icon.svg>`_.
+
+Contributors
+------------
+
+* Holger Brunn <[email protected]>
+
+Do not contact contributors directly about help with questions or problems concerning this addon, but use the `community mailing list <mailto:[email protected]>`_ or the `appropriate specialized mailinglist <https://odoo-community.org/groups>`_ for help, and the bug tracker linked in `Bug Tracker`_ above for technical issues.
+
+Maintainer
+----------
+
+.. image:: https://odoo-community.org/logo.png
+   :alt: Odoo Community Association
+   :target: https://odoo-community.org
+
+This module is maintained by the OCA.
+
+OCA, or the Odoo Community Association, is a nonprofit organization whose
+mission is to support the collaborative development of Odoo features and
+promote its widespread use.
+
+To contribute to this module, please visit https://odoo-community.org.

report_qweb_pdf_watermark/__init__.py

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+# -*- coding: utf-8 -*-
+# © 2016 Therp BV <http://therp.nl>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+from . import models

report_qweb_pdf_watermark/__openerp__.py

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+# -*- coding: utf-8 -*-
+# © 2016 Therp BV <http://therp.nl>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+{
+    "name": "Pdf watermark",
+    "version": "9.0.1.0.0",
+    "author": "Therp BV,Odoo Community Association (OCA)",
+    "license": "AGPL-3",
+    "category": "Reporting",
+    "summary": "Add watermarks to your QWEB PDF reports",
+    "depends": [
+        'report',
+    ],
+    "data": [
+        "demo/report.xml",
+        "views/ir_actions_report_xml.xml",
+    ],
+}

report_qweb_pdf_watermark/demo/report.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<openerp>
+    <data>
+        <report
+            id="demo_report"
+            string="Demo report"
+            model="res.users"
+            report_type="qweb-pdf"
+            name="report_qweb_pdf_watermark.demo_report_view"
+            file="report_qweb_pdf_watermark.demo_report_view"
+            paperformat="report.paperformat_euro"
+        />
+        <record id="demo_report" model="ir.actions.report.xml">
+            <field name="pdf_watermark_expression">docs[:1].company_id.logo</field>
+        </record>
+        <template id="demo_report_view">
+            <t t-call="report.html_container">
+                <t t-call="report.external_layout">
+                    <div class="page">
+                        <ul>
+                            <li t-foreach="docs" t-as="doc">
+                                <t t-esc="doc.name" />
+                            </li>
+                        </ul>
+                    </div>
+                </t>
+            </t>
+        </template>
+    </data>
+</openerp>

report_qweb_pdf_watermark/models/__init__.py

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+# -*- coding: utf-8 -*-
+# © 2016 Therp BV <http://therp.nl>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+from . import ir_actions_report_xml
+from . import report

report_qweb_pdf_watermark/models/ir_actions_report_xml.py

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+# -*- coding: utf-8 -*-
+# © 2016 Therp BV <http://therp.nl>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+from openerp import fields, models
+
+
+class IrActionsReportXml(models.Model):
+    _inherit = 'ir.actions.report.xml'
+
+    pdf_watermark = fields.Binary('Watermark')
+    pdf_watermark_expression = fields.Char(
+        'Watermark expression', help='An expression yielding the base64 '
+        'encoded data to be used as watermark. \n'
+        'You have access to variables `env` and `docs`')

report_qweb_pdf_watermark/models/report.py

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+# -*- coding: utf-8 -*-
+# © 2016 Therp BV <http://therp.nl>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+from base64 import b64decode
+from logging import getLogger
+from pyPdf import PdfFileWriter, PdfFileReader
+from pyPdf.utils import PdfReadError
+from PIL import Image
+from StringIO import StringIO
+from openerp import api, models, tools
+logger = getLogger(__name__)
+
+
+class Report(models.Model):
+    _inherit = 'report'
+
+    @api.v7
+    def get_pdf(
+        self, cr, uid, ids, report_name, html=None, data=None, context=None
+    ):
+        # pylint: disable=R8110
+        # this override cannot be done in v8 api
+        result = super(Report, self).get_pdf(
+            cr, uid, ids, report_name, html=html, data=data,
+            context=context
+        )
+        report = self._get_report_from_name(cr, uid, report_name)
+        watermark = None
+        if report.pdf_watermark:
+            watermark = b64decode(report.pdf_watermark)
+        else:
+            env = api.Environment(cr, uid, context)
+            watermark = tools.safe_eval(
+                report.pdf_watermark_expression or 'None',
+                dict(env=env, docs=env[report.model].browse(ids)),
+            )
+            if watermark:
+                watermark = b64decode(watermark)
+
+        if not watermark:
+            return result
+
+        pdf = PdfFileWriter()
+        pdf_watermark = None
+        try:
+            pdf_watermark = PdfFileReader(StringIO(watermark))
+        except PdfReadError:
+            # let's see if we can convert this with pillow
+            try:
+                image = Image.open(StringIO(watermark))
+                pdf_buffer = StringIO()
+                if image.mode != 'RGB':
+                    image = image.convert('RGB')
+                resolution = image.info.get(
+                    'dpi', report.paperformat_id.dpi or 90
+                )
+                if isinstance(resolution, tuple):
+                    resolution = resolution[0]
+                image.save(pdf_buffer, 'pdf', resolution=resolution)
+                pdf_watermark = PdfFileReader(pdf_buffer)
+            except:
+                logger.exception('Failed to load watermark')
+
+        if not pdf_watermark:
+            logger.error(
+                'No usable watermark found, got %s...', watermark[:100]
+            )
+            return result
+
+        if pdf_watermark.numPages < 1:
+            logger.error('Your watermark pdf does not contain any pages')
+            return result
+        if pdf_watermark.numPages > 1:
+            logger.debug('Your watermark pdf contains more than one page, '
+                         'all but the first one will be ignored')
+
+        for page in PdfFileReader(StringIO(result)).pages:
+            watermark_page = pdf.addBlankPage(
+                page.mediaBox.getWidth(), page.mediaBox.getHeight()
+            )
+            watermark_page.mergePage(pdf_watermark.getPage(0))
+            watermark_page.mergePage(page)
+
+        pdf_content = StringIO()
+        pdf.write(pdf_content)
+
+        return pdf_content.getvalue()

report_qweb_pdf_watermark/tests/__init__.py

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+# -*- coding: utf-8 -*-
+# © 2016 Therp BV <http://therp.nl>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+from . import test_report_qweb_pdf_watermark

report_qweb_pdf_watermark/tests/test_report_qweb_pdf_watermark.py

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+# -*- coding: utf-8 -*-
+# © 2016 Therp BV <http://therp.nl>
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+from openerp.tests.common import TransactionCase
+
+
+class TestReportQwebPdfWatermark(TransactionCase):
+    def test_report_qweb_pdf_watermark(self):
+        # with our image, we have three
+        self._test_report_images(3)
+
+        self.env.ref('report_qweb_pdf_watermark.demo_report').write({
+            'pdf_watermark_expression': False,
+        })
+        # without, we have two
+        self._test_report_images(2)
+
+        self.env.ref('report_qweb_pdf_watermark.demo_report').write({
+            'pdf_watermark': self.env.user.company_id.logo,
+        })
+        # and now we should have three again
+        self._test_report_images(3)
+
+    def _test_report_images(self, number):
+        pdf = self.registry['report'].get_pdf(
+            self.cr,
+            self.uid,
+            self.env['res.users'].search([]).ids,
+            'report_qweb_pdf_watermark.demo_report_view',
+            context={}
+        )
+        self.assertEqual(pdf.count('/Subtype /Image'), number)

report_qweb_pdf_watermark/views/ir_actions_report_xml.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<openerp>
+    <data>
+        <record id="act_report_xml_view" model="ir.ui.view">
+            <field name="model">ir.actions.report.xml</field>
+            <field name="inherit_id" ref="base.act_report_xml_view" />
+            <field name="arch" type="xml">
+                <field name="attachment" position="after">
+                    <field name="pdf_watermark" attrs="{'invisible': [('report_type', '!=', 'qweb-pdf')]}" />
+                    <field name="pdf_watermark_expression" attrs="{'invisible': [('report_type', '!=', 'qweb-pdf')]}" groups="base.group_no_one" />
+                </field>
+            </field>
+        </record>
+    </data>
+</openerp>