Generate api-ref redirects for service type aliases

We track official service type names and their historical aliases. As
api-ref is organized by service-type, it stands to reason that if a
service-type changes (or has changed) that a link might exist to the old
value.

Use the service types authority data to generate a set of redirects for
all aliases of a service to the official service type location.

Change-Id: I96a5502ca6cd3e78f996ad9b60101c907e2150cd

test-requirements.txt

@@ -14,5 +14,8 @@ openstackdocstheme>=1.16.0 # Apache-2.0
 nwdiag
 sphinxcontrib-nwdiag
 
+requests
+os-service-types
+
 # For translations
 Babel>=2.3.4,!=2.4.0  # BSD

tools/www-generator.py

@@ -20,6 +20,8 @@ import sys
 import lxml.html
 from lxml import etree
 import jinja2
+import os_service_types
+import requests
 
 
 def initialize_logging(debug, verbose):
@@ -67,8 +69,16 @@ def main():
         logger.error("initialising template environment failed: %s" % e)
         return 1
 
+    try:
+        service_types = os_service_types.ServiceTypes(
+            session=requests.Session(), only_remote=True)
+    except Exception as e:
+        logger.error("initialising service types data failed: %s" % e)
+        return 1
+
     for templateFile in environment.list_templates():
-        if not templateFile.endswith('.html'):
+        if not (templateFile.endswith('.html')
+                or templateFile.endswith('.htaccess')):
             continue
 
         logger.info("generating %s" % templateFile)
@@ -80,10 +90,14 @@ def main():
                          (templateFile, e))
             continue
 
+
         try:
-            output = lxml.html.tostring(
+            if templateFile.endswith('.html'):
-                lxml.html.fromstring(template.render()),
+                output = lxml.html.tostring(
-                pretty_print=True)
+                    lxml.html.fromstring(template.render()),
+                    pretty_print=True)
+            else:
+                output = template.render(REVERSE=service_types.reverse)
         except Exception as e:
             logger.error("rendering template %s failed: %s" %
                          (templateFile, e))

www/.htaccess

@@ -60,3 +60,9 @@ redirect 301 /api-ref-share-v2.html /api-ref/shared-file-system/index.html
 redirect 301 /api-ref-share-v1.html /api-ref/shared-file-system/index.html
 # Redirect Telemetry (ceilometer only) API
 redirect 301 /api-ref-telemetry-v2.html https://docs.openstack.org/ceilometer/latest/webapi/v2.html
+
+# Redirect service-type aliases to service-type api-ref locations
+{% for alias, service_type in REVERSE.items() -%}
+redirectmatch 301 /api-ref/{{ alias }}/(.*) /api-ref/{{ service_type }}/$1
+{% endfor %}
+