erp5_oauth2_authorisation: Supports external login and erp5_credential if installed.

If erp5_credential is installed in ERP5, we will use the dialog from erp5_credential instead of accessing portal_password directly.

bt5/erp5_oauth2_authorisation/SkinTemplateItem/portal_skins/erp5_oauth2_authorisation/login_once_form.zpt

@@ -12,6 +12,13 @@
       js_list     python: [portal_url + '/erp5.js'];
       came_from   python: request.get('came_from');
       ERP5Site    python: modules['Products.ERP5.ERP5Site'];
+      portal      python: context.getPortalObject();
+      web_site_value             python: context.getWebSiteValue();
+      root_absolute_url          python: (portal if web_site_value is None else web_site_value).absolute_url() + '/';
+      available_oauth_login_list python: portal.ERP5Site_getAvailableOAuthLoginList();
+      enable_google_login        python: 'google' in available_oauth_login_list;
+      enable_facebook_login      python: 'facebook' in available_oauth_login_list;
+      enable_openidconnect_login python: 'openidconnect' in available_oauth_login_list;
     "
   >
     <tal:block metal:use-macro="python: context.main_template.macros['master']">
@@ -56,15 +63,47 @@
             <div class="field">
               <label>&nbsp;</label>
               <div class="input">
-                <a
-                  tal:attributes="
-                    href python: portal_url + '/portal_password/PasswordTool_viewEmailPassword';
-                  "
+                <a tal:define="default_href python: portal_url + '/portal_password/PasswordTool_viewEmailPassword';
+                               credential_href string:${here/portal_url}/ERP5Site_viewCredentialRecoveryLoginDialog;"
+                  tal:attributes="href python: credential_href if getattr(portal.portal_skins, 'erp5_credential', None) else default_href"
                   i18n:translate=""
                   i18n:domain="ui"
                 >I forgot my password!</a>
               </div>
             </div>
+            <tal:block tal:condition="enable_google_login">
+              <div class="field">
+                <label>&nbsp;</label>
+                <div class="input">
+                  <a tal:attributes="href string:${here/portal_url}/ERP5Site_redirectToGoogleLoginPage"
+                     i18n:translate="" i18n:domain="ui" class="google">
+                     <img alt="Sign in with Google" src="google_login_button.png"/>
+                  </a>
+                </div>
+              </div>
+            </tal:block>
+            <tal:block tal:condition="enable_facebook_login">
+              <div class="field">
+                <label>&nbsp;</label>
+                <div class="input">
+                  <a tal:attributes="href string:${here/portal_url}/ERP5Site_redirectToFacebookLoginPage"
+                     i18n:translate="" i18n:domain="ui">
+                    <img alt="Login with Facebook" src="facebook_login_button.png">
+                  </a>
+                </div>
+              </div>
+            </tal:block>
+            <tal:block tal:condition="enable_openidconnect_login">
+              <div class="field">
+                <label>&nbsp;</label>
+                <div class="input">
+                  <a tal:attributes="href string:${here/portal_url}/ERP5Site_redirectToOpenIdLoginPage"
+                     i18n:translate="" i18n:domain="ui">
+                     <img alt="Sign in with OpenID Connect" src="openid_login_button.png"/>
+                  </a>
+                </div>
+              </div>
+            </tal:block>
           </fieldset>
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