✨(teams) add matrix webhook for teams

A webhook to invite/kick team members to a matrix room.

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to
 
 ### Added
 
+- ✨(teams) add matrix webhook for teams #904
 - ✨(resource-server) add SCIM /Me endpoint #895
 - 🔧(git) set LF line endings for all text files #928
 

src/backend/core/enums.py

@@ -24,3 +24,10 @@ class WebhookStatusChoices(models.TextChoices):
     FAILURE = "failure", _("Failure")
     PENDING = "pending", _("Pending")
     SUCCESS = "success", _("Success")
+
+
+class WebhookProtocolChoices(models.TextChoices):
+    """Defines the possible protocols of webhook."""
+
+    SCIM = "scim"
+    MATRIX = "matrix"

src/backend/core/migrations/0017_teamwebhook_protocol.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.2.3 on 2025-06-17 14:23
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('core', '0016_team_external_id_alter_team_users'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='teamwebhook',
+            name='protocol',
+            field=models.CharField(choices=[('scim', 'Scim'), ('matrix', 'Matrix')], default='scim'),
+        ),
+    ]

src/backend/core/models.py

@@ -21,7 +21,7 @@ from django.contrib.postgres.fields import ArrayField
 from django.contrib.sites.models import Site
 from django.core import exceptions, mail, validators
 from django.core.exceptions import ValidationError
-from django.db import models, transaction
+from django.db import models
 from django.template.loader import render_to_string
 from django.utils import timezone
 from django.utils.translation import gettext, override
@@ -31,9 +31,9 @@ import jsonschema
 from timezone_field import TimeZoneField
 from treebeard.mp_tree import MP_Node, MP_NodeManager
 
-from core.enums import WebhookStatusChoices
+from core.enums import WebhookProtocolChoices, WebhookStatusChoices
 from core.plugins.registry import registry as plugin_hooks_registry
-from core.utils.webhooks import scim_synchronizer
+from core.utils.webhooks import webhooks_synchronizer
 from core.validators import get_field_validators_from_setting
 
 logger = getLogger(__name__)
@@ -864,16 +864,12 @@ class TeamAccess(BaseModel):
         Override save function to fire webhooks on any addition or update
         to a team access.
         """
-
-        if self._state.adding:
+        if self._state.adding and self.team.webhooks.exists():
             self.team.webhooks.update(status=WebhookStatusChoices.PENDING)
-            with transaction.atomic():
-                instance = super().save(*args, **kwargs)
-                scim_synchronizer.add_user_to_group(self.team, self.user)
-        else:
-            instance = super().save(*args, **kwargs)
+            # try to synchronize all webhooks
+            webhooks_synchronizer.add_user_to_group(self.team, self.user)
 
-        return instance
+        return super().save(*args, **kwargs)
 
     def delete(self, *args, **kwargs):
         """
@@ -881,11 +877,12 @@ class TeamAccess(BaseModel):
         Don't allow deleting a team access until it is successfully synchronized with all
         its webhooks.
         """
-        self.team.webhooks.update(status=WebhookStatusChoices.PENDING)
-        with transaction.atomic():
-            arguments = self.team, self.user
+        if webhooks := self.team.webhooks.all():
+            webhooks.update(status=WebhookStatusChoices.PENDING)
+            # try to synchronize all webhooks
+            webhooks_synchronizer.remove_user_from_group(self.team, self.user)
+
         super().delete(*args, **kwargs)
-            scim_synchronizer.remove_user_from_group(*arguments)
 
     def get_abilities(self, user):
         """
@@ -943,6 +940,11 @@ class TeamWebhook(BaseModel):
     team = models.ForeignKey(Team, related_name="webhooks", on_delete=models.CASCADE)
     url = models.URLField(_("url"))
     secret = models.CharField(_("secret"), max_length=255, null=True, blank=True)
+    protocol = models.CharField(
+        max_length=None,
+        default=WebhookProtocolChoices.SCIM,
+        choices=WebhookProtocolChoices.choices,
+    )
     status = models.CharField(
         max_length=10,
         default=WebhookStatusChoices.PENDING,

src/backend/core/tests/fixtures/__init__.py

@@ -0,0 +1 @@
+"""Test fixtures."""

src/backend/core/tests/fixtures/matrix.py

@@ -0,0 +1,75 @@
+"""Define here some fake responses from Matrix API, useful to mock responses in tests."""
+
+from rest_framework import status
+
+
+# JOIN ROOMS
+def mock_join_room_successful(room_id):
+    """Mock response when succesfully joining room. Same response if already in room."""
+    return {"message": {"room_id": str(room_id)}, "status_code": status.HTTP_200_OK}
+
+
+def mock_join_room_no_known_servers():
+    """Mock response when room to join cannot be found."""
+    return {
+        "message": {"errcode": "M_UNKNOWN", "error": "No known servers"},
+        "status_code": status.HTTP_404_NOT_FOUND,
+    }
+
+
+def mock_join_room_forbidden():
+    """Mock response when room cannot be joined."""
+    return {
+        "message": {
+            "errcode": "M_FORBIDDEN",
+            "error": "You do not belong to any of the required rooms/spaces to join this room.",
+        },
+        "status_code": status.HTTP_403_FORBIDDEN,
+    }
+
+
+# INVITE USER
+def mock_invite_successful():
+    """Mock response when invite request was succesful. Does not check the user exists."""
+    return {"message": {}, "status_code": status.HTTP_200_OK}
+
+
+def mock_invite_user_already_in_room(user):
+    """Mock response when invitation forbidden for People user."""
+    return {
+        "message": {
+            "errcode": "M_FORBIDDEN",
+            "error": f"{user.email.replace('@', ':')} is already in the room.",
+        },
+        "status_code": status.HTTP_403_FORBIDDEN,
+    }
+
+
+# KICK USER
+def mock_kick_successful():
+    """Mock response when succesfully joining room."""
+    return {"message": {}, "status_code": status.HTTP_200_OK}
+
+
+def mock_kick_user_forbidden(user):
+    """Mock response when kick request is forbidden (i.e. wrong permission or user is room admin."""
+    return {
+        "message": {
+            "errcode": "M_FORBIDDEN",
+            "error": f"You cannot kick user @{user.email.replace('@', ':')}.",
+        },
+        "status_code": status.HTTP_403_FORBIDDEN,
+    }
+
+
+def mock_kick_user_not_in_room():
+    """
+    Mock response when trying to kick a user who isn't in the room. Don't check the user exists.
+    """
+    return {
+        "message": {
+            "errcode": "M_FORBIDDEN",
+            "error": "The target user is not in the room",
+        },
+        "status_code": status.HTTP_403_FORBIDDEN,
+    }

src/backend/core/tests/team_accesses/test_api_team_accesses_create.py

@@ -3,14 +3,17 @@ Test for team accesses API endpoints in People's core app : create
 """
 
 import json
+import logging
 import random
 import re
 
 import pytest
 import responses
+from rest_framework import status
 from rest_framework.test import APIClient
 
-from core import factories, models
+from core import enums, factories, models
+from core.tests.fixtures import matrix
 
 pytestmark = pytest.mark.django_db
 
@@ -171,14 +174,17 @@ def test_api_team_accesses_create_authenticated_owner():
     }
 
 
-def test_api_team_accesses_create_webhook():
+def test_api_team_accesses_create__with_scim_webhook():
     """
-    When the team has a webhook, creating a team access should fire a call.
+    If a team has a SCIM webhook, creating a team access should fire a call
+    with the expected payload.
     """
     user, other_user = factories.UserFactory.create_batch(2)
 
     team = factories.TeamFactory(users=[(user, "owner")])
-    webhook = factories.TeamWebhookFactory(team=team)
+    webhook = factories.TeamWebhookFactory(
+        team=team, protocol=enums.WebhookProtocolChoices.SCIM
+    )
 
     role = random.choice([role[0] for role in models.RoleChoices.choices])
 
@@ -226,3 +232,139 @@ def test_api_team_accesses_create_webhook():
                 }
             ],
         }
+
+    assert models.TeamAccess.objects.filter(user=other_user, team=team).exists()
+
+
+def test_api_team_accesses_create__multiple_webhooks_success(caplog):
+    """
+    When the team has multiple webhooks, creating a team access should fire all the expected calls.
+    If all responses are positive, proceeds to add the user to the team.
+    """
+    caplog.set_level(logging.INFO)
+
+    user, other_user = factories.UserFactory.create_batch(2)
+
+    team = factories.TeamFactory(users=[(user, "owner")])
+    webhook_scim = factories.TeamWebhookFactory(
+        team=team, protocol=enums.WebhookProtocolChoices.SCIM, secret="wesh"
+    )
+    webhook_matrix = factories.TeamWebhookFactory(
+        team=team,
+        url="https://www.webhookserver.fr/#/room/room_id:home_server/",
+        protocol=enums.WebhookProtocolChoices.MATRIX,
+        secret="yo",
+    )
+
+    role = random.choice([role[0] for role in models.RoleChoices.choices])
+
+    client = APIClient()
+    client.force_login(user)
+
+    with responses.RequestsMock() as rsps:
+        # Ensure successful response by scim provider using "responses":
+        rsps.add(
+            rsps.PATCH,
+            re.compile(r".*/Groups/.*"),
+            body="{}",
+            status=200,
+            content_type="application/json",
+        )
+        rsps.add(
+            rsps.POST,
+            re.compile(r".*/join"),
+            body=str(matrix.mock_join_room_successful),
+            status=status.HTTP_200_OK,
+            content_type="application/json",
+        )
+        rsps.add(
+            rsps.POST,
+            re.compile(r".*/invite"),
+            body=str(matrix.mock_invite_successful()["message"]),
+            status=matrix.mock_invite_successful()["status_code"],
+            content_type="application/json",
+        )
+
+        response = client.post(
+            f"/api/v1.0/teams/{team.id!s}/accesses/",
+            {
+                "user": str(other_user.id),
+                "role": role,
+            },
+            format="json",
+        )
+        assert response.status_code == 201
+
+    # Logger
+    log_messages = [msg.message for msg in caplog.records]
+    for webhook in [webhook_scim, webhook_matrix]:
+        assert (
+            f"add_user_to_group synchronization succeeded with {webhook.url}"
+            in log_messages
+        )
+
+    # Status
+    for webhook in [webhook_scim, webhook_matrix]:
+        webhook.refresh_from_db()
+        assert webhook.status == "success"
+    assert models.TeamAccess.objects.filter(user=other_user, team=team).exists()
+
+
+@responses.activate
+def test_api_team_accesses_create__multiple_webhooks_failure(caplog):
+    """When a webhook fails, user should still be added to the team."""
+    caplog.set_level(logging.INFO)
+
+    user, other_user = factories.UserFactory.create_batch(2)
+
+    team = factories.TeamFactory(users=[(user, "owner")])
+    webhook_scim = factories.TeamWebhookFactory(
+        team=team, protocol=enums.WebhookProtocolChoices.SCIM, secret="wesh"
+    )
+    webhook_matrix = factories.TeamWebhookFactory(
+        team=team,
+        url="https://www.webhookserver.fr/#/room/room_id:home_server/",
+        protocol=enums.WebhookProtocolChoices.MATRIX,
+        secret="secret",
+    )
+
+    role = random.choice([role[0] for role in models.RoleChoices.choices])
+    client = APIClient()
+    client.force_login(user)
+
+    responses.patch(
+        re.compile(r".*/Groups/.*"),
+        body="{}",
+        status=200,
+    )
+    responses.post(
+        re.compile(r".*/join"),
+        body=str(matrix.mock_join_room_forbidden()["message"]),
+        status=str(matrix.mock_join_room_forbidden()["status_code"]),
+    )
+
+    response = client.post(
+        f"/api/v1.0/teams/{team.id!s}/accesses/",
+        {
+            "user": str(other_user.id),
+            "role": role,
+        },
+        format="json",
+    )
+    assert response.status_code == status.HTTP_201_CREATED
+
+    # Logger
+    log_messages = [msg.message for msg in caplog.records]
+    assert (
+        f"add_user_to_group synchronization succeeded with {webhook_scim.url}"
+        in log_messages
+    )
+    assert (
+        f"add_user_to_group synchronization failed with {webhook_matrix.url}"
+        in log_messages
+    )
+
+    # Status
+    webhook_scim.status = "success"
+    webhook_matrix.status = "failure"
+    assert models.TeamAccess.objects.filter(user=other_user, team=team).exists()

src/backend/core/tests/utils/test_webhooks_matrix_client.py

@@ -0,0 +1,277 @@
+"""Test Team synchronization webhooks : focus on matrix client."""
+
+import json
+import logging
+import re
+
+from django.test import override_settings
+
+import pytest
+import responses
+from rest_framework import status
+
+from core import factories
+from core.enums import WebhookProtocolChoices
+from core.tests.fixtures import matrix
+from core.utils.webhooks import webhooks_synchronizer
+
+pytestmark = pytest.mark.django_db
+
+
+## INVITE
+@responses.activate
+def test_matrix_webhook__invite_user_to_room_forbidden(caplog):
+    """Cannot invite when Matrix returns forbidden. This might mean the user is an admin."""
+    caplog.set_level(logging.INFO)
+
+    user = factories.UserFactory()
+    webhook = factories.TeamWebhookFactory(
+        protocol=WebhookProtocolChoices.MATRIX,
+        url="https://www.matrix.org/#/room/room_id:home_server",
+        secret="secret-access-token",
+    )
+
+    # Mock successful responses
+    error = matrix.mock_kick_user_forbidden(user)
+    responses.post(
+        re.compile(r".*/join"),
+        body=str(matrix.mock_join_room_successful),
+        status=status.HTTP_200_OK,
+    )
+    responses.post(
+        re.compile(r".*/invite"),
+        body=str(error["message"]),
+        status=error["status_code"],
+    )
+    webhooks_synchronizer.add_user_to_group(team=webhook.team, user=user)
+
+
+@responses.activate
+def test_matrix_webhook__invite_user_to_room_already_in_room(caplog):
+    """If user is already in room, webhooks should be set to success."""
+    caplog.set_level(logging.INFO)
+
+    user = factories.UserFactory()
+    webhook = factories.TeamWebhookFactory(
+        protocol=WebhookProtocolChoices.MATRIX,
+        url="https://www.matrix.org/#/room/room_id:home_server",
+        secret="secret-access-token",
+    )
+
+    # Mock successful responses
+    responses.post(
+        re.compile(r".*/join"),
+        body=str(matrix.mock_join_room_successful("room_id")["message"]),
+        status=matrix.mock_join_room_successful("room_id")["status_code"],
+    )
+    responses.post(
+        re.compile(r".*/invite"),
+        body=str(matrix.mock_invite_user_already_in_room(user)["message"]),
+        status=matrix.mock_invite_user_already_in_room(user)["status_code"],
+    )
+    webhooks_synchronizer.add_user_to_group(team=webhook.team, user=user)
+
+    # Logger
+    log_messages = [msg.message for msg in caplog.records]
+    expected_messages = (
+        f"add_user_to_group synchronization succeeded with {webhook.url}"
+    )
+    assert expected_messages in log_messages
+
+    # Status
+    webhook.refresh_from_db()
+    assert webhook.status == "success"
+
+
+@responses.activate
+def test_matrix_webhook__invite_user_to_room_success(caplog):
+    """The user passed to the function should get invited."""
+    caplog.set_level(logging.INFO)
+
+    user = factories.UserFactory()
+    webhook = factories.TeamWebhookFactory(
+        protocol=WebhookProtocolChoices.MATRIX,
+        url="https://www.matrix.org/#/room/room_id:home_server",
+        secret="secret-access-token",
+    )
+
+    # Mock successful responses
+    responses.post(
+        re.compile(r".*/join"),
+        body=str(matrix.mock_join_room_successful("room_id")["message"]),
+        status=matrix.mock_join_room_successful("room_id")["status_code"],
+    )
+    responses.post(
+        re.compile(r".*/invite"),
+        body=str(matrix.mock_invite_successful()["message"]),
+        status=matrix.mock_invite_successful()["status_code"],
+    )
+    webhooks_synchronizer.add_user_to_group(team=webhook.team, user=user)
+
+    # Check headers
+    headers = responses.calls[0].request.headers
+    assert webhook.secret in headers["Authorization"]
+
+    # Check payloads sent to Matrix API
+    assert json.loads(responses.calls[1].request.body) == {
+        "user_id": f"@{user.email.replace('@', ':')}",
+        "reason": f"User added to team {webhook.team} on People",
+    }
+
+    # Logger
+    log_messages = [msg.message for msg in caplog.records]
+    expected_messages = (
+        f"add_user_to_group synchronization succeeded with {webhook.url}"
+    )
+    assert expected_messages in log_messages
+
+    # Status
+    webhook.refresh_from_db()
+    assert webhook.status == "success"
+
+
+@responses.activate
+@override_settings(TCHAP_ACCESS_TOKEN="TCHAP_TOKEN")
+def test_matrix_webhook__override_secret_for_tchap():
+    """The user passed to the function should get invited."""
+    user = factories.UserFactory()
+    webhook = factories.TeamWebhookFactory(
+        protocol=WebhookProtocolChoices.MATRIX,
+        url="https://www.tchap.gouv.fr/#/room/room_id:home_server",
+        secret="secret-about-to-be-overridden",
+    )
+
+    # Mock successful responses
+    responses.post(
+        re.compile(r".*/join"),
+        body=str(matrix.mock_join_room_successful("room_id")["message"]),
+        status=matrix.mock_join_room_successful("room_id")["status_code"],
+    )
+    responses.post(
+        re.compile(r".*/invite"),
+        body=str(matrix.mock_invite_successful()["message"]),
+        status=matrix.mock_invite_successful()["status_code"],
+    )
+    webhooks_synchronizer.add_user_to_group(team=webhook.team, user=user)
+
+    # Check headers
+    headers = responses.calls[0].request.headers
+    assert "TCHAP_TOKEN" in headers["Authorization"]
+
+
+## KICK
+@responses.activate
+def test_matrix_webhook__kick_user_from_room_not_in_room(caplog):
+    """Webhook should report a success when user was already not in room."""
+    caplog.set_level(logging.INFO)
+
+    user = factories.UserFactory()
+    webhook = factories.TeamWebhookFactory(
+        protocol=WebhookProtocolChoices.MATRIX,
+        url="https://www.matrix.org/#/room/room_id:home_server",
+        secret="secret-access-token",
+    )
+
+    # Mock successful responses
+    responses.post(
+        re.compile(r".*/join"),
+        body=str(matrix.mock_join_room_successful),
+        status=status.HTTP_200_OK,
+    )
+    responses.post(
+        re.compile(r".*/kick"),
+        body=str(matrix.mock_kick_user_not_in_room()["message"]),
+        status=matrix.mock_kick_user_not_in_room()["status_code"],
+    )
+    webhooks_synchronizer.remove_user_from_group(team=webhook.team, user=user)
+
+    # Logger
+    log_messages = [msg.message for msg in caplog.records]
+    assert (
+        f"remove_user_from_group synchronization succeeded with {webhook.url}"
+        in log_messages
+    )
+
+    # Status
+    webhook.refresh_from_db()
+    assert webhook.status == "success"
+
+
+@responses.activate
+def test_matrix_webhook__kick_user_from_room_success(caplog):
+    """The user passed to the function should get removed."""
+    caplog.set_level(logging.INFO)
+
+    user = factories.UserFactory()
+    webhook = factories.TeamWebhookFactory(
+        protocol=WebhookProtocolChoices.MATRIX,
+        url="https://www.matrix.org/#/room/room_id:home_server",
+        secret="secret-access-token",
+    )
+
+    responses.post(
+        re.compile(r".*/join"),
+        body=str(matrix.mock_join_room_successful),
+        status=status.HTTP_200_OK,
+    )
+    responses.post(
+        re.compile(r".*/kick"),
+        body=str(matrix.mock_kick_successful),
+        status=status.HTTP_200_OK,
+    )
+    webhooks_synchronizer.remove_user_from_group(team=webhook.team, user=user)
+
+    # Check payloads sent to Matrix API
+    assert json.loads(responses.calls[1].request.body) == {
+        "user_id": f"@{user.email.replace('@', ':')}",
+        "reason": f"User removed from team {webhook.team} on People",
+    }
+
+    # Logger
+    log_messages = [msg.message for msg in caplog.records]
+    expected_messages = (
+        f"remove_user_from_group synchronization succeeded with {webhook.url}"
+    )
+    assert expected_messages in log_messages
+
+    # Status
+    webhook.refresh_from_db()
+    assert webhook.status == "success"
+
+
+@responses.activate
+def test_matrix_webhook__kick_user_from_room_forbidden(caplog):
+    """Cannot kick an admin."""
+    caplog.set_level(logging.INFO)
+
+    user = factories.UserFactory()
+    webhook = factories.TeamWebhookFactory(
+        protocol=WebhookProtocolChoices.MATRIX,
+        url="https://www.matrix.org/#/room/room_id:home_server",
+        secret="secret-access-token",
+    )
+
+    # Mock successful responses
+    error = matrix.mock_kick_user_forbidden(user)
+    responses.post(
+        re.compile(r".*/join"),
+        body=str(matrix.mock_join_room_successful),
+        status=status.HTTP_200_OK,
+    )
+    responses.post(
+        re.compile(r".*/kick"),
+        body=str(error["message"]),
+        status=error["status_code"],
+    )
+    webhooks_synchronizer.remove_user_from_group(team=webhook.team, user=user)
+
+    # Logger
+    log_messages = [msg.message for msg in caplog.records]
+    assert (
+        f"remove_user_from_group synchronization failed with {webhook.url}"
+        in log_messages
+    )
+
+    # Status
+    webhook.refresh_from_db()
+    assert webhook.status == "failure"

src/backend/core/tests/utils/test_webhooks_scim_client.py

@@ -1,4 +1,4 @@
-"""Test Team synchronization webhooks."""
+"""Test Team synchronization webhooks : focus on scim client"""
 
 import json
 import random
@@ -10,7 +10,7 @@ import pytest
 import responses
 
 from core import factories
-from core.utils.webhooks import scim_synchronizer
+from core.utils.webhooks import webhooks_synchronizer
 
 pytestmark = pytest.mark.django_db
 
@@ -20,7 +20,7 @@ def test_utils_webhooks_add_user_to_group_no_webhooks():
     access = factories.TeamAccessFactory()
 
     with responses.RequestsMock():
-        scim_synchronizer.add_user_to_group(access.team, access.user)
+        webhooks_synchronizer.add_user_to_group(access.team, access.user)
 
     assert len(responses.calls) == 0
 
@@ -42,7 +42,7 @@ def test_utils_webhooks_add_user_to_group_success(mock_info):
             content_type="application/json",
         )
 
-        scim_synchronizer.add_user_to_group(access.team, access.user)
+        webhooks_synchronizer.add_user_to_group(access.team, access.user)
 
         for i, webhook in enumerate(webhooks):
             assert rsps.calls[i].request.url == webhook.url
@@ -107,7 +107,7 @@ def test_utils_webhooks_remove_user_from_group_success(mock_info):
             content_type="application/json",
         )
 
-        scim_synchronizer.remove_user_from_group(access.team, access.user)
+        webhooks_synchronizer.remove_user_from_group(access.team, access.user)
 
         for i, webhook in enumerate(webhooks):
             assert rsps.calls[i].request.url == webhook.url
@@ -163,11 +163,11 @@ def test_utils_webhooks_add_user_to_group_failure(mock_error):
             rsps.PATCH,
             re.compile(r".*/Groups/.*"),
             body="{}",
-            status=random.choice([404, 301, 302]),
+            status=404,
             content_type="application/json",
         )
 
-        scim_synchronizer.add_user_to_group(access.team, access.user)
+        webhooks_synchronizer.add_user_to_group(access.team, access.user)
 
         for i, webhook in enumerate(webhooks):
             assert rsps.calls[i].request.url == webhook.url
@@ -228,7 +228,7 @@ def test_utils_webhooks_add_user_to_group_retries(mock_info, mock_error):
             rsps.add(rsps.PATCH, url, status=200, content_type="application/json"),
         ]
 
-        scim_synchronizer.add_user_to_group(access.team, access.user)
+        webhooks_synchronizer.add_user_to_group(access.team, access.user)
 
         for i in range(4):
             assert all_rsps[i].call_count == 1
@@ -285,7 +285,7 @@ def test_utils_synchronize_course_runs_max_retries_exceeded(mock_error):
             content_type="application/json",
         )
 
-        scim_synchronizer.add_user_to_group(access.team, access.user)
+        webhooks_synchronizer.add_user_to_group(access.team, access.user)
 
         assert rsp.call_count == 5
         assert rsps.calls[0].request.url == webhook.url
@@ -339,7 +339,7 @@ def test_utils_webhooks_add_user_to_group_authorization():
             content_type="application/json",
         )
 
-        scim_synchronizer.add_user_to_group(access.team, access.user)
+        webhooks_synchronizer.add_user_to_group(access.team, access.user)
         assert rsps.calls[0].request.url == webhook.url
 
         # Check headers

src/backend/core/utils/matrix.py

@@ -0,0 +1,136 @@
+"""Matrix client for interoperability to synchronize with remote service providers."""
+
+import logging
+
+from django.conf import settings
+
+import requests
+from rest_framework.status import (
+    HTTP_200_OK,
+)
+from urllib3.util import Retry
+
+logger = logging.getLogger(__name__)
+
+adapter = requests.adapters.HTTPAdapter(
+    max_retries=Retry(
+        total=4,
+        backoff_factor=0.1,
+        status_forcelist=[500, 502],
+        allowed_methods=["POST"],
+    )
+)
+
+session = requests.Session()
+session.mount("http://", adapter)
+session.mount("https://", adapter)
+
+
+class MatrixAPIClient:
+    """A client to interact with Matrix API"""
+
+    secret = settings.TCHAP_ACCESS_TOKEN
+
+    def get_headers(self, webhook):
+        """Build header dict from webhook object."""
+        headers = {"Content-Type": "application/json"}
+        token = webhook.secret if webhook.secret else None
+        if "tchap.gouv.fr" in webhook.url:
+            token = settings.TCHAP_ACCESS_TOKEN
+        headers["Authorization"] = f"Bearer {token}"
+        return headers
+
+    def _get_room_url(self, webhook_url):
+        """Returns room id from webhook url."""
+        room_id = webhook_url.split("/room/")[1]
+        base_url = room_id.split(":")[1]
+        if "tchap.gouv.fr" in webhook_url:
+            base_url = f"matrix.{base_url}"
+        return f"https://{base_url}/_matrix/client/v3/rooms/{room_id}"
+
+    def get_user_id(self, user):
+        """Returns user id from email."""
+        if user.email is None:
+            raise ValueError("You must first set an email for the user.")
+
+        return f"@{user.email.replace('@', ':')}"
+
+    def join_room(self, webhook):
+        """Accept invitation to the room. As of today, it is a mandatory step
+        to make sure our account will be able to invite/remove users."""
+        if webhook.secret is None:
+            raise ValueError("Please configure this webhook's secret access token.")
+
+        return session.post(
+            f"{self._get_room_url(webhook.url)}/join",
+            json={},
+            headers=self.get_headers(webhook),
+            verify=False,
+            timeout=3,
+        )
+
+    def add_user_to_group(self, webhook, user):
+        """Send request to invite an user to a room or space upon adding them to group.."""
+        join_response = self.join_room(webhook)
+        if join_response.status_code != HTTP_200_OK:
+            logger.error(
+                "Synchronization failed (cannot join room) %s",
+                webhook.url,
+            )
+            return join_response, False
+
+        user_id = self.get_user_id(user)
+        response = session.post(
+            f"{self._get_room_url(webhook.url)}/invite",
+            json={
+                "user_id": user_id,
+                "reason": f"User added to team {webhook.team} on People",
+            },
+            headers=self.get_headers(webhook),
+            verify=False,
+            timeout=3,
+        )
+
+        # Checks for false negative
+        # (i.e. trying to invite user already in room)
+        webhook_succeeded = False
+        if (
+            response.status_code == HTTP_200_OK
+            or b"is already in the room." in response.content
+        ):
+            webhook_succeeded = True
+
+        return response, webhook_succeeded
+
+    def remove_user_from_group(self, webhook, user):
+        """Send request to kick an user from a room or space upon removing them from group."""
+        join_response = self.join_room(webhook)
+        if join_response.status_code != HTTP_200_OK:
+            logger.error(
+                "Synchronization failed (cannot join room) %s",
+                webhook.url,
+            )
+            return join_response, False
+
+        user_id = self.get_user_id(user)
+        response = session.post(
+            f"{self._get_room_url(webhook.url)}/kick",
+            json={
+                "user_id": user_id,
+                "reason": f"User removed from team {webhook.team} on People",
+            },
+            headers=self.get_headers(webhook),
+            verify=False,
+            timeout=3,
+        )
+
+        # Checks for false negative
+        # (i.e. trying to remove user who already left the room)
+        webhook_succeeded = False
+        if (
+            response.status_code == HTTP_200_OK
+            or b"The target user is not in the room" in response.content
+        ):
+            webhook_succeeded = True
+
+        return response, webhook_succeeded

src/backend/core/utils/scim.py

@@ -39,7 +39,7 @@ class SCIMClient:
             ],
         }
 
-        return session.patch(
+        response = session.patch(
             webhook.url,
             json=payload,
             headers=webhook.get_headers(),
@@ -47,6 +47,8 @@ class SCIMClient:
             timeout=3,
         )
 
+        return response, response.ok
+
     def remove_user_from_group(self, webhook, user):
         """Remove a user from a group by its ID or email."""
         payload = {
@@ -61,10 +63,12 @@ class SCIMClient:
                 }
             ],
         }
-        return session.patch(
+        response = session.patch(
             webhook.url,
             json=payload,
             headers=webhook.get_headers(),
             verify=False,
             timeout=3,
         )
+
+        return response, response.ok

src/backend/core/utils/webhooks.py

@@ -4,14 +4,16 @@ import logging
 
 import requests
 
+from core import enums
 from core.enums import WebhookStatusChoices
 
+from .matrix import MatrixAPIClient
 from .scim import SCIMClient
 
 logger = logging.getLogger(__name__)
 
 
-class WebhookSCIMClient:
+class WebhookClient:
     """Wraps the SCIM client to record call results on webhooks."""
 
     def __getattr__(self, name):
@@ -26,31 +28,15 @@ class WebhookSCIMClient:
                 if not webhook.url:
                     continue
 
-                client = SCIMClient()
                 status = WebhookStatusChoices.FAILURE
-                try:
-                    response = getattr(client, name)(webhook, user)
+                response, webhook_succeeded = self._get_response_and_status(
+                    name, webhook, user
+                )
 
-                except requests.exceptions.RetryError as exc:
-                    logger.error(
-                        "%s synchronization failed due to max retries exceeded with url %s",
-                        name,
-                        webhook.url,
-                        exc_info=exc,
-                    )
-                except requests.exceptions.RequestException as exc:
-                    logger.error(
-                        "%s synchronization failed with %s.",
-                        name,
-                        webhook.url,
-                        exc_info=exc,
-                    )
-                else:
-                    extra = {
-                        "response": response.content,
-                    }
+                if response is not None:
+                    extra = {"response": response.content}
                     # pylint: disable=no-member
-                    if response.status_code == requests.codes.ok:
+                    if webhook_succeeded:
                         logger.info(
                             "%s synchronization succeeded with %s",
                             name,
@@ -71,5 +57,37 @@ class WebhookSCIMClient:
 
         return wrapper
 
+    def _get_client(self, webhook):
+        """Get client depending on the protocol."""
+        if webhook.protocol == enums.WebhookProtocolChoices.MATRIX:
+            return MatrixAPIClient()
 
-scim_synchronizer = WebhookSCIMClient()
+        return SCIMClient()
+
+    def _get_response_and_status(self, name, webhook, user):
+        """Get response from webhook outside party."""
+        client = self._get_client(webhook)
+
+        try:
+            response, webhook_succeeded = getattr(client, name)(webhook, user)
+        except requests.exceptions.RetryError as exc:
+            logger.error(
+                "%s synchronization failed due to max retries exceeded with url %s",
+                name,
+                webhook.url,
+                exc_info=exc,
+            )
+        except requests.exceptions.RequestException as exc:
+            logger.error(
+                "%s synchronization failed with %s.",
+                name,
+                webhook.url,
+                exc_info=exc,
+            )
+        else:
+            return response, webhook_succeeded
+
+        return None, False
+
+
+webhooks_synchronizer = WebhookClient()

src/backend/people/settings.py

@@ -601,6 +601,11 @@ class Base(Configuration):
         environ_name="DNS_PROVISIONING_API_CREDENTIALS",
         environ_prefix=None,
     )
+    TCHAP_ACCESS_TOKEN = values.Value(
+        default=None,
+        environ_name="TCHAP_ACCESS_TOKEN",
+        environ_prefix=None,
+    )
 
     # Organizations
     ORGANIZATION_REGISTRATION_ID_VALIDATORS = json.loads(

src/helm/env.d/dev/values.desk.yaml.gotmpl

@@ -73,6 +73,7 @@ backend:
       secretKeyRef:
         name: backend
         key: MAIL_PROVISIONING_API_CREDENTIALS
+    TCHAP_ACCESS_TOKEN: service_account_key
   command:
     - "gunicorn"
     - "-c"