[IMP] auth_signup: various usability improvements in signup process

 * allow new signup on invalid token
 * relabel signup buttons
 * send a welcome email upon signup with a signup token.

This way, should the token somehow be usurped by someone else,
the original partner's email address will be notified.
(before the usurper can change the email)

addons/auth_signup/controllers/main.py

@@ -35,6 +35,16 @@ class AuthSignupHome(Home):
         if 'error' not in qcontext and request.httprequest.method == 'POST':
             try:
                 self.do_signup(qcontext)
+                # Send an account creation confirmation email
+                if qcontext.get('token'):
+                    user_sudo = request.env['res.users'].sudo().search([('login', '=', qcontext.get('login'))])
+                    template = request.env.ref('auth_signup.mail_template_user_signup_account_created', raise_if_not_found=False)
+                    if user_sudo and template:
+                        template.sudo().with_context(
+                            lang=user_sudo.lang,
+                            auth_login=werkzeug.url_encode({'auth_login': user_sudo.email}),
+                            password=request.params.get('password')
+                        ).send_mail(user_sudo.id, force_send=True)
                 return super(AuthSignupHome, self).web_login(*args, **kw)
             except UserError as e:
                 qcontext['error'] = str(e)

addons/auth_signup/data/auth_signup_data.xml

@@ -91,5 +91,49 @@
             <field name="user_signature" eval="False"/>
         </record>
 
+        <!-- Email template for new users that used a signup token -->
+        <record id="mail_template_user_signup_account_created" model="mail.template">
+            <field name="name">Auth Signup: Odoo Account Created</field>
+            <field name="model_id" ref="base.model_res_users"/>
+            <field name="email_from">"${object.company_id.name|safe}" &lt;${(object.company_id.email or user.email)|safe}&gt;</field>
+            <field name="email_to">${object.email|safe}</field>
+            <field name="subject">Welcome to ${object.company_id.name}!</field>
+            <field name="body_html" type="html">
+<div style="padding:0px;width:600px;margin:auto;background: #FFFFFF repeat top /100%;color:#777777">
+    <table cellspacing="0" cellpadding="0" style="width:600px;border-collapse:collapse;background:inherit;color:inherit">
+        <tbody><tr>
+            <td valign="center" width="200" style="padding:10px 10px 10px 5px;font-size: 12px">
+                <img src="/logo.png" style="padding: 0px; margin: 0px; height: auto; width: 80px;" alt="${user.company_id.name}" />
+            </td>
+        </tr></tbody>
+    </table>
+</div>
+<div style="padding:0px;width:600px;margin:auto;background: #FFFFFF repeat top /100%;color:#777777">
+    <p>Dear ${object.name},</p>
+    <p>
+        Your account has been successfully created!
+    </p>
+    <p>
+        Your login: ${object.email}
+        <br/>
+        Your password: ${ctx['password']}
+    </p>
+    <p>
+        To gain access to your account, you can use the following link:
+    </p>
+    <div style="text-align: center; margin-top: 16px;">
+        <a href="/web/login?${ctx['auth_login']}" style="padding: 5px 10px; font-size: 12px; line-height: 18px; color: #FFFFFF; border-color:#875A7B; text-decoration: none; display: inline-block; margin-bottom: 0px; font-weight: 400; text-align: center; vertical-align: middle; cursor: pointer; white-space: nowrap; background-image: none; background-color: #875A7B; border: 1px solid #875A7B; border-radius:3px">Go to My Account</a>
+    </div>
+    <p>Best regards,</p>
+</div>
+<div style="padding:0px;width:600px;margin:auto; margin-top: 10px; background: #fff repeat top /100%;color:#777777">
+    ${user.signature | safe}
+    <p style="font-size: 11px; margin-top: 10px;">
+        <strong>Sent by ${user.company_id.name} using <a href="www.odoo.com" style="text-decoration:none; color: #875A7B;">Odoo</a></strong>
+    </p>
+</div></field>
+            <field name="user_signature" eval="False"/>
+        </record>
+
     </data>
 </odoo>

addons/auth_signup/views/auth_signup_login_templates.xml

@@ -2,7 +2,7 @@
 <odoo>
         <template id="auth_signup.login" inherit_id="web.login" name="Sign up - Reset Password">
             <xpath expr="//button[@type='submit']" position="before">
-                <a t-if="signup_enabled" t-attf-href="/web/signup?{{ keep_query() }}" class="btn btn-link pull-right">Sign up</a>
+                <a t-if="signup_enabled" t-attf-href="/web/signup?{{ keep_query() }}" class="btn btn-link pull-right">Don't have an account?</a>
                 <a t-if="reset_password_enabled" t-attf-href="/web/reset_password?{{ keep_query() }}" class="btn btn-link pull-right">Reset Password</a>
             </xpath>
         </template>
@@ -40,7 +40,7 @@
                   <input type="hidden" name="csrf_token" t-att-value="request.csrf_token()"/>
 
                     <t t-call="auth_signup.fields">
-                        <t t-set="only_passwords" t-value="bool(token)"/>
+                        <t t-set="only_passwords" t-value="bool(token and not invalid_token)"/>
                     </t>
 
                     <p class="alert alert-danger" t-if="error">
@@ -49,7 +49,7 @@
                     <input type="hidden" name="redirect" t-att-value="redirect"/>
                     <input type="hidden" name="token" t-att-value="token"/>
                     <div class="clearfix oe_login_buttons">
-                        <a t-attf-href="/web/login?{{ keep_query() }}" class="btn btn-link pull-right">Back to Login</a>
+                        <a t-attf-href="/web/login?{{ keep_query() }}" class="btn btn-link pull-right">Already have an account?</a>
                         <button type="submit" class="btn btn-primary pull-left">Sign up</button>
                     </div>