Un-break "View manifest" link in UI

This link was using the previously unauthenticated API endpoint for
manifests. However, that now requires authentication like any other
endpoint. Instead, provide a simple UI route which displays the
manifest.

buildsrht/blueprints/jobs.py

@@ -510,3 +510,17 @@ def job_by_id(username, job_id):
             sort_tasks=lambda tasks: sorted(tasks, key=lambda t: t.id),
             min_artifact_date=min_artifact_date,
             payment_required=payment_required)
+
+@jobs.route("/~<username>/job/<int:job_id>/manifest")
+def manifest_by_job_id(username, job_id):
+    user = User.query.filter(User.username == username).first()
+    if not user:
+        abort(404)
+    job = Job.query.options(sa.orm.joinedload(Job.tasks)).get(job_id)
+    if not job:
+        abort(404)
+    if not get_access(job):
+        abort(404)
+    if job.owner_id != user.id:
+        abort(404)
+    return Response(job.manifest, mimetype="text/plain")

buildsrht/templates/job.html

@@ -69,7 +69,7 @@
         <dt>Updated</dt>
         <dd>{{ job.updated | date }}</dd>
         <dt>Build manifest</dt>
-        <dd><a href="/api/jobs/{{ job.id }}/manifest">view manifest »</a></dd>
+	<dd><a href="/~{{ job.owner.username }}/job/{{ job.id }}/manifest">view manifest »</a></dd>
       </dl>
       {% if current_user and job.status.value in [
         "success", "failed", "timeout", "cancelled"