fix(config-resolver): resolve region first from regionHash (#2969)

Author: trivikr

packages/config-resolver/src/regionInfo/getRegionInfo.spec.ts

@@ -52,7 +52,7 @@ describe(getRegionInfo.name, () => {
   });
 
   const getMockResolvedRegion = (regionCase: RegionCase): string =>
-    regionCase === RegionCase.REGION ? mockRegion : mockEndpointRegion;
+    regionCase !== RegionCase.ENDPOINT ? mockRegion : mockEndpointRegion;
 
   const getMockResolvedPartitionOptions = (partitionHash) => ({ partitionHash });
 

packages/config-resolver/src/regionInfo/getRegionInfo.ts

@@ -17,7 +17,7 @@ export const getRegionInfo = (
   { signingService, regionHash, partitionHash }: GetRegionInfoOptions
 ): RegionInfo => {
   const partition = getResolvedPartition(region, { partitionHash });
-  const resolvedRegion = partitionHash[partition]?.endpoint ?? region;
+  const resolvedRegion = region in regionHash ? region : partitionHash[partition]?.endpoint ?? region;
 
   const hostname = getResolvedHostname(resolvedRegion, {
     signingService,

tests/functional/endpoints/fips/test_cases_supported.json

@@ -1553,6 +1553,13 @@
     "signingRegion": "us-east-2",
     "hostname": "health-fips.us-east-2.amazonaws.com"
   },
+  {
+    "endpointPrefix": "iam",
+    "sdkId": "IAM",
+    "region": "iam-fips",
+    "signingRegion": "us-east-1",
+    "hostname": "iam-fips.amazonaws.com"
+  },
   {
     "endpointPrefix": "identity-chime",
     "sdkId": "Chime SDK Identity",
@@ -1959,6 +1966,13 @@
     "signingRegion": "us-west-2",
     "hostname": "network-firewall-fips.us-west-2.amazonaws.com"
   },
+  {
+    "endpointPrefix": "organizations",
+    "sdkId": "Organizations",
+    "region": "fips-aws-global",
+    "signingRegion": "us-east-1",
+    "hostname": "organizations-fips.us-east-1.amazonaws.com"
+  },
   {
     "endpointPrefix": "outposts",
     "sdkId": "Outposts",
@@ -2155,6 +2169,13 @@
     "signingRegion": "us-west-2",
     "hostname": "resource-groups-fips.us-west-2.amazonaws.com"
   },
+  {
+    "endpointPrefix": "route53",
+    "sdkId": "Route 53",
+    "region": "fips-aws-global",
+    "signingRegion": "us-east-1",
+    "hostname": "route53-fips.amazonaws.com"
+  },
   {
     "endpointPrefix": "runtime.lex",
     "sdkId": "Lex Runtime Service",
@@ -2372,6 +2393,13 @@
     "signingRegion": "us-west-2",
     "hostname": "session.qldb-fips.us-west-2.amazonaws.com"
   },
+  {
+    "endpointPrefix": "shield",
+    "sdkId": "Shield",
+    "region": "fips-aws-global",
+    "signingRegion": "us-east-1",
+    "hostname": "shield-fips.us-east-1.amazonaws.com"
+  },
   {
     "endpointPrefix": "sms",
     "sdkId": "SMS",
@@ -2841,6 +2869,13 @@
     "signingRegion": "us-west-2",
     "hostname": "translate-fips.us-west-2.amazonaws.com"
   },
+  {
+    "endpointPrefix": "waf",
+    "sdkId": "WAF",
+    "region": "aws-fips",
+    "signingRegion": "us-east-1",
+    "hostname": "waf-fips.amazonaws.com"
+  },
   {
     "endpointPrefix": "waf-regional",
     "sdkId": "WAF Regional",
@@ -3730,6 +3765,13 @@
     "signingRegion": "us-gov-west-1",
     "hostname": "servicecatalog-appregistry.us-gov-west-1.amazonaws.com"
   },
+  {
+    "endpointPrefix": "servicediscovery",
+    "sdkId": "ServiceDiscovery",
+    "region": "servicediscovery-fips",
+    "signingRegion": "us-gov-west-1",
+    "hostname": "servicediscovery-fips.us-gov-west-1.amazonaws.com"
+  },
   {
     "endpointPrefix": "servicequotas",
     "sdkId": "Service Quotas",

tests/functional/endpoints/fips/test_cases_unsupported.json

@@ -27,48 +27,6 @@
     "signingRegion": "us-isob-east-1",
     "hostname": "dms.us-isob-east-1.sc2s.sgov.gov"
   },
-  {
-    "endpointPrefix": "waf",
-    "sdkId": "WAF",
-    "region": "aws-fips",
-    "signingRegion": "us-east-1",
-    "hostname": "waf-fips.amazonaws.com"
-  },
-  {
-    "endpointPrefix": "iam",
-    "sdkId": "IAM",
-    "region": "iam-fips",
-    "signingRegion": "us-east-1",
-    "hostname": "iam-fips.amazonaws.com"
-  },
-  {
-    "endpointPrefix": "organizations",
-    "sdkId": "Organizations",
-    "region": "fips-aws-global",
-    "signingRegion": "us-east-1",
-    "hostname": "organizations-fips.us-east-1.amazonaws.com"
-  },
-  {
-    "endpointPrefix": "route53",
-    "sdkId": "Route 53",
-    "region": "fips-aws-global",
-    "signingRegion": "us-east-1",
-    "hostname": "route53-fips.amazonaws.com"
-  },
-  {
-    "endpointPrefix": "shield",
-    "sdkId": "Shield",
-    "region": "fips-aws-global",
-    "signingRegion": "us-east-1",
-    "hostname": "shield-fips.us-east-1.amazonaws.com"
-  },
-  {
-    "endpointPrefix": "servicediscovery",
-    "sdkId": "ServiceDiscovery",
-    "region": "servicediscovery-fips",
-    "signingRegion": "us-gov-west-1",
-    "hostname": "servicediscovery-fips.us-gov-west-1.amazonaws.com"
-  },
   {
     "endpointPrefix": "servicediscovery",
     "sdkId": "ServiceDiscovery",