feat: add Open Graph sharing metadata to program certs (openedx#2858)

* feat: add  Open Graph sharing metadata to program certs

Adding Open Graph sharing metadata deprogram certificates so they look
good on social media.

FIXES: APER-3403

Author: deborahgu

credentials/apps/credentials/tests/test_views.py

@@ -150,6 +150,19 @@ def test_sharing_bar_with_staff_user(self):
 
         self.assertContains(response, "Print or share your certificate")
 
+    @responses.activate
+    def test_open_graph_metadata(self):
+        """Verify that the anonymous view contains OpenGraph metadata."""
+        self.client.logout()
+        response = self._render_user_credential()
+
+        self.assertContains(response, "og:url")
+        self.assertContains(response, "og:title")
+        self.assertContains(response, "og:description")
+        self.assertContains(response, '"og:type" content="image/png"')
+        self.assertContains(response, self.user_credential.get_absolute_url())
+        self.assertContains(response, "I completed a course at ")
+
     @responses.activate
     def test_awarded_with_logged_in_user(self):
         """Verify that the view renders awarded certificates with sharing bar."""
@@ -160,7 +173,7 @@ def test_awarded_with_logged_in_user(self):
         self.assertContains(response, "Print or share your certificate")
         self.assertContains(response, "Print this certificate")
 
-        self.assertContains(response=response, text=self.PROGRAM_NAME, count=2)
+        self.assertContains(response=response, text=self.PROGRAM_NAME, count=3)
         self.assertNotContains(response=response, text=self.CREDENTIAL_TITLE)
 
         self.assertEqual(response_context_data["user_credential"], self.user_credential)
@@ -226,7 +239,7 @@ def test_awarded_with_custom_title(self):
 
         self.assertContains(response, "Print or share your certificate")
         self.assertNotContains(response=response, text=self.PROGRAM_NAME)
-        self.assertContains(response=response, text=self.CREDENTIAL_TITLE, count=2)
+        self.assertContains(response=response, text=self.CREDENTIAL_TITLE, count=3)
 
     def test_revoked(self):
         """Verify that the view returns 404 when the uuid is valid but certificate status

credentials/apps/credentials/views.py

@@ -188,6 +188,11 @@ def get_context_data(self, **kwargs):
                 "program_name": program_details.title,
                 "credential_title": program_details.credential_title,
                 "org_name_string": org_name_string,
+                "share_url": self.request.build_absolute_uri(),
+                "share_image_url": program_details.organizations[0].certificate_logo_image_url,
+                "share_text": _("I completed a course at {platform_name}.").format(
+                    platform_name=self.site_configuration.platform_name
+                ),
             }
         )
         if program_details.hours_of_effort: