Enhance the dashboard. (#262)

* Update to a more flexible admin authentication
* Admin can now access any project
* Add delete and edit options in the dashboard
* Add a link to the dashboard in the nav bar

This is a rework of the changes proposed by @Olivd, so they can apply on top of
the latest master without trouble. All credit goes to him for the code.

13 files changed, 193 insertions, 58 deletions

diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 94b802c..1dd87ce 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -6,16 +6,25 @@ This document describes changes between each past release.
 2.0 (unreleased)
 ----------------
 
+### Breaking changes
+
+- ``ADMIN_PASSWORD`` is now hashed rather than plain text. The ``ihatemoney generate_password_hash`` command can now be used to generate a proper password HASH (#236)
+- Turn the WSGI file into a python module, renamed from budget/ihatemoney.wsgi to ihatemoney/wsgi.py. Please update your Apache configuration!
+- Admin privileges are now required to access the dashboard
+
 ### Changed
 
-- **BREAKING CHANGE** Use a hashed ``ADMIN_PASSWORD`` instead of a clear text one, ``./budget/manage.py generate_password_hash`` can be used to generate a proper password HASH (#236)
-- **BREAKING CHANGE** Turn the WSGI file into a python module, renamed from budget/ihatemoney.wsgi to budget/wsgi.py. Please update your Apache configuration!
 - Changed the recommended gunicorn configuration to use the wsgi module as an entrypoint
 
 ### Added
 
 - Add a statistics tab (#257)
 - Add python3.6 support (#259)
+- Public project creation can now be deactivated using the ALLOW_PUBLIC_PROJECT_CREATION setting.
+- If admin credentials are defined, they can be used to access any project.
+- It is now possible to edit and delete projects directly from the dashboard.
+- The dashboard can now be deactivated using the ACTIVATE_ADMIN_DASHBOARD setting.
+- When activated, a link to the dashboard appears in the navigation bar.
 
 ### Removed
 
diff --git a/docs/installation.rst b/docs/installation.rst
index e0f70df..dcc6231 100644
--- a/docs/installation.rst
+++ b/docs/installation.rst
@@ -92,27 +92,35 @@ properly.
 
 .. warning:: You **must** customize the ``SECRET_KEY`` on a production installation.
 
-+----------------------------+---------------------------+----------------------------------------------------------------------------------------+
-| Setting name               |  Default                  | What does it do?                                                                       |
-+============================+===========================+========================================================================================+
-| SQLALCHEMY_DATABASE_URI    |  ``sqlite:///budget.db``  | Specifies the type of backend to use and its location. More information                |
-|                            |                           | on the format used can be found on `the SQLAlchemy documentation                       |
-|                            |                           | <http://docs.sqlalchemy.org/en/latest/core/engines.html#database-urls>`_.              |
-+----------------------------+---------------------------+----------------------------------------------------------------------------------------+
-| SECRET_KEY                 |  ``tralala``              | The secret key used to encrypt the cookies. **This needs to be changed**.              |
-+----------------------------+---------------------------+----------------------------------------------------------------------------------------+
-| MAIL_DEFAULT_SENDER        | ``("Budget manager",      | A python tuple describing the name and email adress to use when sending                |
-|                            | "budget@notmyidea.org")`` | emails.                                                                                |
-+----------------------------+---------------------------+----------------------------------------------------------------------------------------+
-| ACTIVATE_DEMO_PROJECT      |  ``True``                 | If set to `True`, a demo project will be available on the frontpage.                   |
-+----------------------------+---------------------------+----------------------------------------------------------------------------------------+
-|                            |  ``""``                   | If not empty, the specified password must be entered to create new projects.           |
-| ADMIN_PASSWORD             |                           | To generate the proper password HASH, use ``ihatemoney generate_password_hash``        |
-|                            |                           | and copy its output into the value of *ADMIN_PASSWORD*.                                |
-+----------------------------+---------------------------+----------------------------------------------------------------------------------------+
-| APPLICATION_ROOT           |  ``""``                   | If empty, ihatemoney will be served at domain root (e.g: *http://domain.tld*), if set  |
-|                            |                           | to ``"foo"``, it will be served from a "folder" (e.g: *http://domain.tld/foo*)         |
-+----------------------------+---------------------------+----------------------------------------------------------------------------------------+
++-------------------------------+---------------------------+----------------------------------------------------------------------------------------+
+| Setting name                  |  Default                  | What does it do?                                                                       |
++===============================+===========================+========================================================================================+
+| SQLALCHEMY_DATABASE_URI       |  ``sqlite:///budget.db``  | Specifies the type of backend to use and its location. More information                |
+|                               |                           | on the format used can be found on `the SQLAlchemy documentation                       |
+|                               |                           | <http://docs.sqlalchemy.org/en/latest/core/engines.html#database-urls>`_.              |
++-------------------------------+---------------------------+----------------------------------------------------------------------------------------+
+| SECRET_KEY                    |  ``tralala``              | The secret key used to encrypt the cookies. **This needs to be changed**.              |
++-------------------------------+---------------------------+----------------------------------------------------------------------------------------+
+| MAIL_DEFAULT_SENDER           | ``("Budget manager",      | A python tuple describing the name and email adress to use when sending                |
+|                               | "budget@notmyidea.org")`` | emails.                                                                                |
++-------------------------------+---------------------------+----------------------------------------------------------------------------------------+
+| ACTIVATE_DEMO_PROJECT         |  ``True``                 | If set to `True`, a demo project will be available on the frontpage.                   |
++-------------------------------+---------------------------+----------------------------------------------------------------------------------------+
+|                               |                           | Hashed password to access protected endpoints. If left empty, all administrative       |
+| ADMIN_PASSWORD                |  ``""``                   | tasks are disabled.                                                                    |
+|                               |                           | To generate the proper password HASH, use ``ihatemoney generate_password_hash``        |
+|                               |                           | and copy the output into the value of *ADMIN_PASSWORD*.                                |
++-------------------------------+---------------------------+----------------------------------------------------------------------------------------+
+| ALLOW_PUBLIC_PROJECT_CREATION |  ``True``                 | If set to `True`, everyone can create a project without entering the admin password    |
+|                               |                           | If set to `False`, the password needs to be entered (and as such, defined in the       |
+|                               |                           | settings).                                                                             |
++-------------------------------+---------------------------+----------------------------------------------------------------------------------------+
+| ACTIVATE_ADMIN_DASHBOARD      |  ``False``                | If set to `True`, the dashboard will become accessible entering the admin password     |
+|                               |                           | If set to `True`, a non empty ADMIN_PASSWORD needs to be set                           |
++-------------------------------+---------------------------+----------------------------------------------------------------------------------------+
+| APPLICATION_ROOT              |  ``""``                   | If empty, ihatemoney will be served at domain root (e.g: *http://domain.tld*), if set  |
+|                               |                           | to ``"foo"``, it will be served from a "folder" (e.g: *http://domain.tld/foo*)         |
++-------------------------------+---------------------------+----------------------------------------------------------------------------------------+
 
 In a production environment
 ---------------------------
diff --git a/ihatemoney/default_settings.py b/ihatemoney/default_settings.py
index fcb41db..c7ce297 100644
--- a/ihatemoney/default_settings.py
+++ b/ihatemoney/default_settings.py
@@ -29,3 +29,9 @@ ACTIVATE_DEMO_PROJECT = True
 # DO NOT enter the password in cleartext. Generate a password hash with
 # "ihatemoney generate_password_hash" instead.
 ADMIN_PASSWORD = ""
+
+# If set to True (default value) anyone can create a new project.
+ALLOW_PUBLIC_PROJECT_CREATION = True
+
+# If set to True, an administration dashboard is available.
+ACTIVATE_ADMIN_DASHBOARD = False
diff --git a/ihatemoney/static/css/main.css b/ihatemoney/static/css/main.css
index 54a0008..73802a4 100644
--- a/ihatemoney/static/css/main.css
+++ b/ihatemoney/static/css/main.css
@@ -169,6 +169,30 @@ footer{
     background: url('../images/edit.png') no-repeat right;
 }
 
+project-actions {
+    padding-top: 10px;
+    text-align: center;
+}
+
+.project-actions > .delete, .project-actions > .edit {
+    font-size: 0px;
+    display: block;
+    width: 16px;
+    height: 16px;
+    margin: 2px;
+    margin-left: 5px;
+    float: left;
+}
+
+.project-actions > .delete{
+    background: url('../images/delete.png') no-repeat right;
+}
+
+.project-actions > .edit{
+    background: url('../images/edit.png') no-repeat right;
+}
+
+
 .balance .balance-value{
     text-align:right;
 }
diff --git a/ihatemoney/templates/admin.html b/ihatemoney/templates/admin.html
new file mode 100644
index 0000000..031d27c
--- /dev/null
+++ b/ihatemoney/templates/admin.html
@@ -0,0 +1,12 @@
+{% extends "layout.html" %}
+{% block content %}
+<h2>Authentication</h2>
+
+{% if is_admin_auth_enabled %}
+<form class="form-horizontal" method="POST" accept-charset="utf-8">
+    {{ forms.admin(form) }}
+</form>
+{% else %}
+<div class="alert alert-danger">{{ _("Administration tasks are currently disabled.") }}</div>
+{% endif %}
+{% endblock %}
diff --git a/ihatemoney/templates/authenticate.html b/ihatemoney/templates/authenticate.html
index f241c48..98914d0 100644
--- a/ihatemoney/templates/authenticate.html
+++ b/ihatemoney/templates/authenticate.html
@@ -7,13 +7,7 @@
 to") }} <a href="{{ url_for(".create_project", project_id=create_project) }}">{{ _("create it") }}</a>{{ _("?") }}
 </p>
 {% endif %}
-{% if admin_auth %}
-<form class="form-horizontal" method="POST" accept-charset="utf-8">
-    {{ forms.admin(form) }}
-</form>
-{% else %}
 <form class="form-horizontal" method="POST" accept-charset="utf-8">
     {{ forms.authenticate(form) }}
 </form>
-{% endif %}
 {% endblock %}
diff --git a/ihatemoney/templates/dashboard.html b/ihatemoney/templates/dashboard.html
index 3f50915..b1220bd 100644
--- a/ihatemoney/templates/dashboard.html
+++ b/ihatemoney/templates/dashboard.html
@@ -1,8 +1,8 @@
 {% extends "layout.html" %}
 {% block content %}
-
+{% if is_admin_dashboard_activated %}
 <table id="bill_table" class="table table-striped">
-    <thead><tr><th>{{ _("Project") }}</th><th>{{ _("Number of members") }}</th><th>{{ _("Number of bills") }}</th><th>{{_("Newest bill")}}</th><th>{{_("Oldest bill")}}</th></tr></thead>
+    <thead><tr><th>{{ _("Project") }}</th><th>{{ _("Number of members") }}</th><th>{{ _("Number of bills") }}</th><th>{{_("Newest bill")}}</th><th>{{_("Oldest bill")}}</th><th>{{_("Actions")}}</th></tr></thead>
     <tbody>{% for project in projects|sort(attribute='name') %}
         <tr class="{{ loop.cycle("odd", "even") }}">
         <td>{{ project.name }}</td><td>{{ project.members | count }}</td><td>{{ project.get_bills().count() }}</td>
@@ -13,9 +13,15 @@
         <td></td>
         <td></td>
         {% endif %}
+        <td class="project-actions">
+            <a class="edit" href="{{ url_for(".edit_project", project_id=project.id) }}" title="{{ _("edit") }}">{{ _('edit') }}</a>
+            <a class="delete" href="{{ url_for(".delete_project", project_id=project.id) }}" title="{{ _("delete") }}">{{ _('delete') }}</a>
+        </td>
         </tr>
     {% endfor %}
     </tbody>
 </table>
+{% else %}
+<div class="alert alert-danger">{{ _("The Dashboard is currently deactivated.") }}</div>
+{% endif %}
 {% endblock %}
-
diff --git a/ihatemoney/templates/home.html b/ihatemoney/templates/home.html
index 9bfe467..a628ecc 100644
--- a/ihatemoney/templates/home.html
+++ b/ihatemoney/templates/home.html
@@ -28,9 +28,7 @@
             </form>
         </div>
         <div class="col-xs-12 col-sm-5 col-md-3 offset-sm-1">
-            {% if is_admin_mode_enabled %}
-            <a href="{{ url_for(".create_project") }}">...{{ _("or create a new one") }}</a>
-            {% else %}
+            {% if is_public_project_creation_allowed %}
             <form id="creation-form" class="form-horizontal" action="{{ url_for(".create_project") }}" method="post">
                 <fieldset class="form-group">
                     <legend>...{{ _("or create a new one") }}</legend>
@@ -40,6 +38,8 @@
                     <button class="btn" type="submit">{{ _("let's get started") }}</button>
                 </div>
             </form>
+            {% else %}
+            <a href="{{ url_for(".create_project") }}">...{{ _("or create a new one") }}</a>
             {% endif %}
         </main>
     </div>
diff --git a/ihatemoney/templates/layout.html b/ihatemoney/templates/layout.html
index 36f01f8..8510911 100644
--- a/ihatemoney/templates/layout.html
+++ b/ihatemoney/templates/layout.html
@@ -64,6 +64,9 @@
           {% endif %}
           <li class="nav-item{% if g.lang == "fr" %} active{% endif %}"><a class="nav-link" href="{{ url_for(".change_lang", lang="fr") }}">fr</a></li>
           <li class="nav-item{% if g.lang == "en" %} active{% endif %}"><a class="nav-link" href="{{ url_for(".change_lang", lang="en") }}">en</a></li>
+          {% if g.show_admin_dashboard_link %}
+          <li class="nav-item{% if request.url_rule.endpoint == "main.dashboard" %} active{% endif %}"><a class="nav-link" href="{{ url_for(".dashboard") }}">{{ _("Dashboard") }}</a></li>
+          {% endif %}
         </ul>
       </div>
     </nav>
diff --git a/ihatemoney/tests/tests.py b/ihatemoney/tests/tests.py
index ac3551c..36ca6fc 100644
--- a/ihatemoney/tests/tests.py
+++ b/ihatemoney/tests/tests.py
@@ -379,8 +379,17 @@ class BudgetTestCase(IhatemoneyTestCase):
             c.get("/exit")
             self.assertNotIn('raclette', session)
 
+        # test that whith admin credentials, one can access every project
+        self.app.config['ADMIN_PASSWORD'] = generate_password_hash("pass")
+        with self.app.test_client() as c:
+            resp = c.post("/admin?goto=%2Fraclette", data={'admin_password': 'pass'})
+            self.assertNotIn("Authentication", resp.data.decode('utf-8'))
+            self.assertTrue(session['is_admin'])
+
     def test_admin_authentication(self):
         self.app.config['ADMIN_PASSWORD'] = generate_password_hash("pass")
+        # Disable public project creation so we have an admin endpoint to test
+        self.app.config['ALLOW_PUBLIC_PROJECT_CREATION'] = False
 
         # test the redirection to the authentication page when trying to access admin endpoints
         resp = self.client.get("/create")
@@ -401,7 +410,8 @@ class BudgetTestCase(IhatemoneyTestCase):
     def test_login_throttler(self):
         self.app.config['ADMIN_PASSWORD'] = generate_password_hash("pass")
 
-        # Authenticate 3 times with a wrong passsword
+        # Activate admin login throttling by authenticating 4 times with a wrong passsword
+        self.client.post("/admin?goto=%2Fcreate", data={'admin_password': 'wrong'})
         self.client.post("/admin?goto=%2Fcreate", data={'admin_password': 'wrong'})
         self.client.post("/admin?goto=%2Fcreate", data={'admin_password': 'wrong'})
         resp = self.client.post("/admin?goto=%2Fcreate", data={'admin_password': 'wrong'})
@@ -624,8 +634,23 @@ class BudgetTestCase(IhatemoneyTestCase):
         self.assertIn("Invalid email address", resp.data.decode('utf-8'))
 
     def test_dashboard(self):
-        response = self.client.get("/dashboard")
-        self.assertEqual(response.status_code, 200)
+        # test that the dashboard is deactivated by default
+        resp = self.client.post(
+            "/admin?goto=%2Fdashboard",
+            data={'admin_password': 'adminpass'},
+            follow_redirects=True
+        )
+        self.assertIn('<div class="alert alert-danger">', resp.data.decode('utf-8'))
+
+        # test access to the dashboard when it is activated
+        self.app.config['ACTIVATE_ADMIN_DASHBOARD'] = True
+        self.app.config['ADMIN_PASSWORD'] = generate_password_hash("adminpass")
+        resp = self.client.post(
+            "/admin?goto=%2Fdashboard",
+            data={'admin_password': 'adminpass'},
+            follow_redirects=True
+        )
+        self.assertIn('<thead><tr><th>Project</th><th>Number of members', resp.data.decode('utf-8'))
 
     def test_statistics_page(self):
         self.post_project("raclette")
diff --git a/ihatemoney/translations/fr/LC_MESSAGES/messages.mo b/ihatemoney/translations/fr/LC_MESSAGES/messages.mo
index d6011d5..56b50d3 100644
--- a/ihatemoney/translations/fr/LC_MESSAGES/messages.mo
+++ b/ihatemoney/translations/fr/LC_MESSAGES/messages.mo
diff --git a/ihatemoney/translations/fr/LC_MESSAGES/messages.po b/ihatemoney/translations/fr/LC_MESSAGES/messages.po
index e8b9793..93a80a9 100644
--- a/ihatemoney/translations/fr/LC_MESSAGES/messages.po
+++ b/ihatemoney/translations/fr/LC_MESSAGES/messages.po
@@ -251,6 +251,10 @@ msgstr "le créer"
 msgid "?"
 msgstr " ?"
 
+#: templates/authenticate.html:7
+msgid "Administration tasks are currently disabled."
+msgstr "Les tâches d'administration sont actuellement désactivées."
+
 #: templates/create_project.html:4
 msgid "Create a new project"
 msgstr "Créer un nouveau projet"
@@ -275,6 +279,10 @@ msgstr "Facture la plus récente"
 msgid "Oldest bill"
 msgstr "Facture la plus ancienne"
 
+#: templates/dashboard.html:25
+msgid "The Dashboard is currently deactivated."
+msgstr "La page d'administration est actuellement désactivée."
+
 #: templates/edit_project.html:6 templates/list_bills.html:24
 msgid "you sure?"
 msgstr "c'est sûr ?"
diff --git a/ihatemoney/web.py b/ihatemoney/web.py
index 82e1591..753fe42 100644
--- a/ihatemoney/web.py
+++ b/ihatemoney/web.py
@@ -34,17 +34,30 @@ main = Blueprint("main", __name__)
 login_throttler = LoginThrottler(max_attempts=3, delay=1)
 
 
-def requires_admin(f):
+def requires_admin(bypass=None):
     """Require admin permissions for @requires_admin decorated endpoints.
-       Has no effect if ADMIN_PASSWORD is empty (default value)
+
+    This has no effect if ADMIN_PASSWORD is empty.
+
+    :param bypass: Used to conditionnaly bypass the admin authentication.
+                   It expects a tuple containing the name of an application
+                   setting and its expected value.
+                   e.g. if you use @require_admin(bypass=("ALLOW_PUBLIC_PROJECT_CREATION", True))
+                   Admin authentication will be bypassed when ALLOW_PUBLIC_PROJECT_CREATION is
+                   set to True.
     """
-    @wraps(f)
-    def admin_auth(*args, **kws):
-        is_admin = session.get('is_admin')
-        if is_admin or not current_app.config['ADMIN_PASSWORD']:
-            return f(*args, **kws)
-        raise Redirect303(url_for('.admin', goto=request.path))
-    return admin_auth
+    def check_admin(f):
+        @wraps(f)
+        def admin_auth(*args, **kws):
+            is_admin_auth_bypassed = False
+            if bypass is not None and current_app.config.get(bypass[0]) == bypass[1]:
+                is_admin_auth_bypassed = True
+            is_admin = session.get('is_admin')
+            if is_admin or is_admin_auth_bypassed:
+                return f(*args, **kws)
+            raise Redirect303(url_for('.admin', goto=request.path))
+        return admin_auth
+    return check_admin
 
 
 @main.url_defaults
@@ -60,9 +73,23 @@ def add_project_id(endpoint, values):
 
 
 @main.url_value_preprocessor
+def set_show_admin_dashboard_link(endpoint, values):
+    """Sets the "show_admin_dashboard_link" variable application wide
+    in order to use it in the layout template.
+    """
+
+    g.show_admin_dashboard_link = (
+        current_app.config["ACTIVATE_ADMIN_DASHBOARD"]
+        and current_app.config["ADMIN_PASSWORD"]
+    )
+
+
+@main.url_value_preprocessor
 def pull_project(endpoint, values):
     """When a request contains a project_id value, transform it directly
-    into a project by checking the credentials are stored in session.
+    into a project by checking the credentials stored in the session.
+
+    With administration credentials, one can access any project.
 
     If not, redirect the user to an authentication form
     """
@@ -76,7 +103,9 @@ def pull_project(endpoint, values):
         if not project:
             raise Redirect303(url_for(".create_project",
                                       project_id=project_id))
-        if project.id in session and session[project.id] == project.password:
+
+        is_admin = session.get('is_admin')
+        if (project.id in session and session[project.id] == project.password) or is_admin:
             # add project into kwargs and call the original function
             g.project = project
         else:
@@ -87,15 +116,20 @@ def pull_project(endpoint, values):
 
 @main.route("/admin", methods=["GET", "POST"])
 def admin():
-    """Admin authentication"""
+    """Admin authentication.
+
+    When ADMIN_PASSWORD is empty, admin authentication is deactivated.
+    """
     form = AdminAuthenticationForm()
     goto = request.args.get('goto', url_for('.home'))
+    is_admin_auth_enabled = bool(current_app.config['ADMIN_PASSWORD'])
     if request.method == "POST":
         client_ip = request.remote_addr
         if not login_throttler.is_login_allowed(client_ip):
             msg = _("Too many failed login attempts, please retry later.")
             form.errors['admin_password'] = [msg]
-            return render_template("authenticate.html", form=form, admin_auth=True)
+            return render_template("admin.html", form=form, admin_auth=True,
+                                   is_admin_auth_enabled=is_admin_auth_enabled)
         if form.validate():
             # Valid password
             if (check_password_hash(current_app.config['ADMIN_PASSWORD'],
@@ -109,7 +143,8 @@ def admin():
             msg = _("This admin password is not the right one. Only %(num)d attempts left.",
                     num=login_throttler.get_remaining_attempts(client_ip))
             form.errors['admin_password'] = [msg]
-    return render_template("authenticate.html", form=form, admin_auth=True)
+    return render_template("admin.html", form=form, admin_auth=True,
+                           is_admin_auth_enabled=is_admin_auth_enabled)
 
 
 @main.route("/authenticate", methods=["GET", "POST"])
@@ -167,18 +202,17 @@ def authenticate(project_id=None):
 def home():
     project_form = ProjectForm()
     auth_form = AuthenticationForm()
-    # If ADMIN_PASSWORD is empty we consider that admin mode is disabled
-    is_admin_mode_enabled = bool(current_app.config['ADMIN_PASSWORD'])
     is_demo_project_activated = current_app.config['ACTIVATE_DEMO_PROJECT']
+    is_public_project_creation_allowed = current_app.config['ALLOW_PUBLIC_PROJECT_CREATION']
 
     return render_template("home.html", project_form=project_form,
                            is_demo_project_activated=is_demo_project_activated,
-                           is_admin_mode_enabled=is_admin_mode_enabled,
+                           is_public_project_creation_allowed=is_public_project_creation_allowed,
                            auth_form=auth_form, session=session)
 
 
 @main.route("/create", methods=["GET", "POST"])
-@requires_admin
+@requires_admin(bypass=("ALLOW_PUBLIC_PROJECT_CREATION", True))
 def create_project():
     form = ProjectForm()
     if request.method == "GET" and 'project_id' in request.values:
@@ -295,7 +329,7 @@ def delete_project():
     g.project.remove_project()
     flash(_('Project successfully deleted'))
 
-    return redirect(url_for(".home"))
+    return redirect(request.headers.get('Referer') or url_for('.home'))
 
 
 @main.route("/exit")
@@ -530,5 +564,11 @@ def statistics():
 
 
 @main.route("/dashboard")
+@requires_admin()
 def dashboard():
-    return render_template("dashboard.html", projects=Project.query.all())
+    is_admin_dashboard_activated = current_app.config['ACTIVATE_ADMIN_DASHBOARD']
+    return render_template(
+        "dashboard.html",
+        projects=Project.query.all(),
+        is_admin_dashboard_activated=is_admin_dashboard_activated
+    )