[ADD] auth_oidc_portal: Link OAuth provider on portal user create

auth_oidc_portal/README.rst

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+**This file is going to be generated by oca-gen-addon-readme.**
+
+*Manual changes will be overwritten.*
+
+Please provide content in the ``readme`` directory:
+
+* **DESCRIPTION.rst** (required)
+* INSTALL.rst (optional)
+* CONFIGURE.rst (optional)
+* **USAGE.rst** (optional, highly recommended)
+* DEVELOP.rst (optional)
+* ROADMAP.rst (optional)
+* HISTORY.rst (optional, recommended)
+* **CONTRIBUTORS.rst** (optional, highly recommended)
+* CREDITS.rst (optional)
+
+Content of this README will also be drawn from the addon manifest,
+from keys such as name, authors, maintainers, development_status,
+and license.
+
+A good, one sentence summary in the manifest is also highly recommended.
+
+
+Automatic changelog generation
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+`HISTORY.rst` can be auto generated using `towncrier <https://pypi.org/project/towncrier>`_.
+
+Just put towncrier compatible changelog fragments into `readme/newsfragments`
+and the changelog file will be automatically generated and updated when a new fragment is added.
+
+Please refer to `towncrier` documentation to know more.
+
+NOTE: the changelog will be automatically generated when using `/ocabot merge $option`.
+If you need to run it manually, refer to `OCA/maintainer-tools README <https://github.com/OCA/maintainer-tools>`_.

auth_oidc_portal/__init__.py

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+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
+
+from . import wizard

auth_oidc_portal/__manifest__.py

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+# Copyright 2023 glueckkanja AG (https://www.glueckkanja.com)
+# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).
+
+{
+    "name": "Authentication OpenID Connect on Portal",
+    "summary": "Allow portal users to login through OpenID Connect Provider",
+    "version": "16.0.1.0.0",
+    "author": ("CRogos (glueckkanja AG), Odoo Community Association (OCA)"),
+    "license": "AGPL-3",
+    "maintainers": ["CRogos"],
+    "category": "hr",
+    "website": "https://github.com/OCA/server-auth",
+    "depends": ["auth_oidc", "portal"],
+    "data": [
+        "wizard/portal_wizard_views.xml",
+    ],
+    "auto_install": False,
+    "installable": True,
+}

auth_oidc_portal/readme/DESCRIPTION.rst

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+Select a OAuth provider for a portal user. The email address is also used as oauth_id and the first active OAuth provider is selected as default when creating a new portal user.
+
+.. image:: ..static/description/oauth-portal-user.png

auth_oidc_portal/wizard/__init__.py

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+# See LICENSE file for full copyright and licensing details.
+
+from . import portal_wizard

auth_oidc_portal/wizard/portal_wizard.py

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+from odoo import fields, models
+from odoo.tools import email_normalize
+
+
+class PortalWizardUser(models.TransientModel):
+    # A model to configure users in the portal wizard.
+
+    _inherit = "portal.wizard.user"
+
+    def _get_default_provider(self):
+        return self.env["auth.oauth.provider"].search([("enabled", "=", True)], limit=1)
+
+    oauth_provider_id = fields.Many2one(
+        "auth.oauth.provider",
+        string="OAuth Provider",
+        default=_get_default_provider,
+        domain=[("enabled", "=", True)],
+    )
+
+    def _create_user(self):
+        # create a new user for wizard_user.partner_id
+        # :returns record of res.users
+
+        user = super(PortalWizardUser, self)._create_user()
+        if self.oauth_provider_id:
+            user.oauth_uid = email_normalize(self.email).lower()
+            user.oauth_provider_id = self.oauth_provider_id
+
+        return user

auth_oidc_portal/wizard/portal_wizard_views.xml

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+<?xml version="1.0" encoding="utf-8" ?>
+<odoo>
+        <!-- wizard view -->
+        <record id="wizard_view" model="ir.ui.view">
+            <field name="name">Grant oidc portal access</field>
+            <field name="model">portal.wizard</field>
+            <field name="inherit_id" ref="portal.wizard_view" />
+            <field name="arch" type="xml">
+                <field name="login_date" position="before">
+                    <field name="oauth_provider_id" />
+                </field>
+            </field>
+        </record>
+</odoo>

setup/auth_oidc_portal/odoo/addons/auth_oidc_portal

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+../../../../auth_oidc_portal

setup/auth_oidc_portal/setup.py

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+import setuptools
+
+setuptools.setup(
+    setup_requires=['setuptools-odoo'],
+    odoo_addon=True,
+)