feat(auth): bouton Connexion avec LinkedIn sur connexion/inscription (#88)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/pages/connexion.py

@@ -14,6 +14,8 @@ register_page(
 ERROR_MESSAGES = {
     "invalid_credentials": "Identifiants invalides.",
     "email_not_verified": "Vérifiez d'abord votre adresse email (consultez votre boîte de réception).",
+    "oauth_cancelled": "Connexion LinkedIn annulée.",
+    "oauth_failed": "Échec de la connexion via LinkedIn. Réessayez.",
 }
 
 INFO_MESSAGES = {
@@ -26,6 +28,15 @@ INFO_MESSAGES = {
 }
 
 
+def linkedin_button():
+    return html.A(
+        "Connexion avec LinkedIn",
+        href="/auth/linkedin",
+        className="btn w-100 mb-2",
+        style={"backgroundColor": "rgb(10, 102, 194)", "color": "white"},
+    )
+
+
 def layout(error: str | None = None, email: str | None = None, **kwargs):
     alerts = []
     if error and error in ERROR_MESSAGES:
@@ -70,6 +81,8 @@ def layout(error: str | None = None, email: str | None = None, **kwargs):
                     dbc.Button("Se connecter", type="submit", color="primary"),
                 ],
             ),
+            html.Div("ou", className="text-center text-muted my-2"),
+            linkedin_button(),
             html.Hr(),
             html.Div(
                 [

src/pages/inscription.py

@@ -1,6 +1,8 @@
 import dash_bootstrap_components as dbc
 from dash import dcc, html, register_page
 
+from src.pages.connexion import linkedin_button
+
 NAME = "Inscription"
 
 register_page(
@@ -67,6 +69,8 @@ def layout(error: str | None = None, email: str | None = None, **_):
                     dbc.Button("Créer le compte", type="submit", color="primary"),
                 ],
             ),
+            html.Div("ou", className="text-center text-muted my-2"),
+            linkedin_button(),
             html.Hr(),
             dcc.Link("Déjà un compte ? Se connecter", href="/connexion"),
         ],

tests/auth/test_oauth_routes.py

@@ -72,3 +72,28 @@ def test_callback_user_cancelled_redirects(client, users_db_path):
     resp = client.get("/auth/linkedin/callback?error=user_cancelled_login")
     assert resp.status_code == 302
     assert "error=oauth_cancelled" in resp.headers["Location"]
+
+
+def test_connexion_layout_has_linkedin_button():
+    import src.app  # noqa: F401 - Initialize Dash app before importing pages
+    from src.pages.connexion import layout
+
+    html_str = str(layout())
+    assert "Connexion avec LinkedIn" in html_str
+    assert "/auth/linkedin" in html_str
+
+
+def test_connexion_layout_shows_oauth_error():
+    import src.app  # noqa: F401 - Initialize Dash app before importing pages
+    from src.pages.connexion import layout
+
+    assert "LinkedIn" in str(layout(error="oauth_failed"))
+
+
+def test_inscription_layout_has_linkedin_button():
+    import src.app  # noqa: F401 - Initialize Dash app before importing pages
+    from src.pages.inscription import layout
+
+    html_str = str(layout())
+    assert "Connexion avec LinkedIn" in html_str
+    assert "/auth/linkedin" in html_str