Init

.gitignore

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+build/
+template/

src/handler.py

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+#!/usr/bin/env python
+
+import os
+import sys
+import time
+import urllib.request
+import yaml
+
+def eprint(*args, **kwargs):
+    print(*args, file=sys.stderr, **kwargs)
+
+# The key is the url
+# The value holds the content and the timestamp
+file_cache = {}
+file_cache_ttl = 60
+
+mapper_file = ''
+with open('/var/openfaas/secrets/url-mapper-file', 'r') as f:
+    mapper_file = f.read().strip()
+
+def get_url_content(url):
+    if url in file_cache:
+        cache_entry = file_cache[url]
+        if cache_entry['timestamp'] + file_cache_ttl > time.time():
+            return cache_entry['content']
+
+    try:
+        response = urllib.request.urlopen(url)
+        targets = yaml.safe_load(response.read())
+    except Exception as e:
+        eprint("Failed to load URL mapper file: %s" % e)
+        return None
+
+    file_cache[url] = {
+        'content': targets,
+        'timestamp': time.time()
+    }
+    return targets
+
+
+def get_entry(args, targets):
+    while args:
+        arg = args.pop(0)
+        if not arg:
+            continue
+        targets = targets.get(arg, None)
+        if isinstance(targets, dict):
+            continue
+        return targets, args
+    return None, args
+
+def get_entry_for_url(url, args):
+    targets = get_url_content(url)
+    if not targets:
+        return None
+
+    entry, args = get_entry(args, targets)
+    if not entry:
+        return None
+    if entry.startswith('include:'):
+        entry = entry.split(':', 1)[1]
+        return get_entry_for_url(entry, args)
+    return entry
+
+    
+def handle(event, context):
+
+    args = event.path.split('/')
+
+    url = get_entry_for_url(mapper_file, args)
+
+
+    if not url:
+        return {
+            "statusCode": 404,
+            "body": "URL not found"
+        }
+
+    return {
+        "statusCode": 302,
+        "body": url,
+        "headers": {
+            "Location": url
+        }
+    }

src/requirements.txt

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+PyYAML==6.0

stack.yml

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+provider:
+  name: openfaas
+  gateway: https://faas.serguzim.me
+
+functions:
+  url-mapper:
+    lang: python3-http
+    handler: ./src
+    image: registry.serguzim.me/faas/url-mapper
+    secrets:
+      - url-mapper-file # url to mapper file
+configuration:
+  templates:
+    - name: python3-http-debian
+      source: https://github.com/openfaas-incubator/python-flask-template