Implement support for the host prefix in operations (#1514)

* Implement support for the host prefix in operations

This is needed to have a working implementation of LocationService.

* Keep the original query string when possible

Author: stof

src/Definition/Operation.php

@@ -203,6 +203,11 @@ public function isEndpointOperation(): bool
         return $this->data['endpointoperation'] ?? false;
     }
 
+    public function getHostPrefix(): ?string
+    {
+        return $this->data['endpoint']['hostPrefix'] ?? null;
+    }
+
     private function getInputShape(): Shape
     {
         if (isset($this->data['input']['shape'])) {

src/Generator/InputGenerator.php

@@ -515,6 +515,16 @@ private function inputClassRequestGetters(StructureShape $inputShape, ClassBuild
             }
         }
 
+        $hostPrefixArgument = '';
+        if (null !== $hostPrefix = $operation->getHostPrefix()) {
+            if (preg_match('/\{([a-zA-Z0-9]+)}/', $hostPrefix)) {
+                throw new \InvalidArgumentException('Parameters are not supported in host prefix yet.');
+            }
+
+            $this->requirementsRegistry->addRequirement('async-aws/core', '^1.20');
+            $hostPrefixArgument = ', ' . var_export($hostPrefix, true);
+        }
+
         $body['uri'] .= '$uriString = ' . $uriStringCode . ';';
 
         $method = var_export($operation->getHttpMethod(), true);
@@ -534,7 +544,7 @@ private function inputClassRequestGetters(StructureShape $inputShape, ClassBuild
 {$body['body']}
 
 // Return the Request
-return new Request($method, \$uriString, \$query, \$headers, StreamFactory::create(\$body));
+return new Request($method, \$uriString, \$query, \$headers, StreamFactory::create(\$body)$hostPrefixArgument);
 PHP
         );
     }