NPA-4284: Add python script to translate request headers

Author: ellie-bound1-NHSD

proxies/live/apiproxy/policies/TranslateRequestHeaders.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<Script async="false" continueOnError="false" enabled="true" name="TranslateRequestHeaders">
+    <DisplayName>TranslateRequestHeaders</DisplayName>
+    <Properties/>
+    <ResourceURL>py://translate-request-headers.py</ResourceURL>
+</Script>

proxies/live/apiproxy/resources/py/translate-request-headers.py

@@ -0,0 +1,15 @@
+# Access request headers dictionary
+request_headers = request.headers
+
+# Map of lowercase header name to desired parcel case header name
+request_header_translation = {
+    "x-request-id": "X-Request-ID",
+    "x-correlation-id": "X-Correlation-ID"
+}
+
+# Loop through request headers
+for key, value in request_headers.items():
+    key = key.lower()
+    desired_name = request_header_translation.get(key)
+    if desired_name:
+        flow.setVariable(f"request.header.{desired_name}", value)

proxies/live/apiproxy/targets/target.xml

@@ -8,6 +8,9 @@
             <Step>
                 <Name>FlowCallout.ApplyRateLimiting</Name>
             </Step>
+            <Step>
+                <Name>TranslateRequestHeaders</Name>
+            </Step>
             <Step>
                 <Name>AddDeveloperAppData</Name>
             </Step>