Add docs/tests for API Gateway customizations

This adds documentation and protocol tests for the customizations
required to generate an API Gateway client.

docs/source/1.0/spec/aws/customizations/apigateway-customizations.rst

@@ -0,0 +1,16 @@
+=================================
+Amazon API Gateway Customizations
+=================================
+
+.. contents:: Table of contents
+    :depth: 1
+    :local:
+    :backlinks: none
+
+
+--------------------------------
+``Accept`` header
+--------------------------------
+
+A client for Amazon API Gateway MUST set the ``Accept`` header to the string
+literal value of "application/json" for all requests.

docs/source/1.0/spec/aws/customizations/index.rst

@@ -0,0 +1,11 @@
+==========================
+AWS Service Customizations
+==========================
+
+.. rst-class:: large-toctree
+
+.. toctree::
+    :maxdepth: 2
+
+    apigateway-customizations
+    glacier-customizations

docs/source/1.0/spec/aws/index.rst

@@ -35,6 +35,6 @@ AWS Service Customizations
 .. rst-class:: large-toctree
 
 .. toctree::
-    :maxdepth: 3
+    :maxdepth: 2
 
-    glacier-customizations
+    customizations/index

smithy-aws-protocol-tests/model/restJson1/services/apigateway.smithy

@@ -0,0 +1,174 @@
+$version: "1.0"
+
+namespace com.amazonaws.apigateway
+
+use aws.api#service
+use aws.auth#sigv4
+use aws.protocols#restJson1
+use smithy.test#httpRequestTests
+
+@service(
+    sdkId: "API Gateway",
+    arnNamespace: "apigateway",
+    cloudFormationName: "ApiGateway",
+    cloudTrailEventSource: "apigateway.amazonaws.com",
+    endpointPrefix: "apigateway"
+)
+@sigv4(
+    name: "apigateway",
+)
+@restJson1
+@title("Amazon API Gateway")
+service BackplaneControlService {
+    version: "2015-07-09",
+    operations: [
+        GetRestApis,
+    ],
+}
+
+
+@httpRequestTests([
+    {
+        id: "ApiGatewayAccept",
+        documentation: "API Gateway requires that this Accept header is set on all requests.",
+        protocol: restJson1,
+        method: "GET",
+        uri: "/restapis",
+        headers: {
+            "Accept": "application/json",
+        },
+        body: "",
+        params: {},
+    }
+])
+@http(
+    method: "GET",
+    uri: "/restapis",
+    code: 200,
+)
+@paginated(
+    inputToken: "position",
+    outputToken: "position",
+    items: "items",
+    pageSize: "limit",
+)
+@readonly
+operation GetRestApis {
+    input: GetRestApisRequest,
+    output: RestApis,
+    errors: [
+        BadRequestException,
+        TooManyRequestsException,
+        UnauthorizedException,
+    ],
+}
+
+@error("client")
+@httpError(400)
+structure BadRequestException {
+    message: String,
+}
+
+structure EndpointConfiguration {
+    types: ListOfEndpointType,
+    vpcEndpointIds: ListOfString,
+}
+
+structure GetRestApisRequest {
+    @httpQuery("position")
+    position: String,
+
+    @httpQuery("limit")
+    limit: NullableInteger,
+}
+
+structure RestApi {
+    id: String,
+    name: String,
+    description: String,
+    createdDate: Timestamp,
+    version: String,
+    warnings: ListOfString,
+    binaryMediaTypes: ListOfString,
+    minimumCompressionSize: NullableInteger,
+    apiKeySource: ApiKeySourceType,
+    endpointConfiguration: EndpointConfiguration,
+    policy: String,
+    tags: MapOfStringToString,
+    disableExecuteApiEndpoint: Boolean,
+}
+
+structure RestApis {
+    @jsonName("item")
+    items: ListOfRestApi,
+
+    @httpQuery("position")
+    position: String,
+}
+
+@error("client")
+@httpError(429)
+structure TooManyRequestsException {
+    @httpHeader("Retry-After")
+    retryAfterSeconds: String,
+    message: String,
+}
+
+@error("client")
+@httpError(401)
+structure UnauthorizedException {
+    message: String,
+}
+
+list ListOfEndpointType {
+    member: EndpointType,
+}
+
+list ListOfString {
+    member: String,
+}
+
+list ListOfRestApi {
+    member: RestApi,
+}
+
+map MapOfStringToString {
+    key: String,
+    value: String,
+}
+
+@enum([
+    {
+        value: "HEADER",
+        name: "HEADER",
+    },
+    {
+        value: "AUTHORIZER",
+        name: "AUTHORIZER",
+    },
+])
+string ApiKeySourceType
+
+boolean Boolean
+@enum([
+    {
+        value: "REGIONAL",
+        name: "REGIONAL",
+    },
+    {
+        value: "EDGE",
+        name: "EDGE",
+    },
+    {
+        value: "PRIVATE",
+        name: "PRIVATE",
+    },
+])
+string EndpointType
+
+@box
+integer NullableInteger
+
+string String
+
+timestamp Timestamp