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GraphiQLMiddleware.cs
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GraphiQLMiddleware.cs
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using System;
using System.IO;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Options;
namespace GraphQL.Middleware
{
/// <summary>
/// Provides middleware to display GraphiQL.
/// </summary>
public sealed class GraphiQLMiddleware
{
private static readonly string Template = ReadTemplate();
private readonly string graphiqlPath;
private readonly string graphqlPath;
private readonly RequestDelegate next;
/// <summary>
/// Initializes a new instance of the <see cref="GraphiQLMiddleware" /> class.
/// </summary>
/// <param name="next">
/// The next request delegate.
/// </param>
/// <param name="options">
/// The GraphiQL options.
/// </param>
/// <exception cref="ArgumentNullException">
/// Throws <see cref="ArgumentNullException" /> if <paramref name="next" /> or <paramref name="options" /> is null.
/// </exception>
public GraphiQLMiddleware(RequestDelegate next , IOptions<GraphiQLOptions> options)
{
if (next == null)
{
throw new ArgumentNullException(nameof(next));
}
if (options == null)
{
throw new ArgumentNullException(nameof(options));
}
this.next = next;
var optionsValue = options.Value;
graphiqlPath = string.IsNullOrEmpty(optionsValue?.GraphiQLPath) ? GraphiQLOptions.DefaultGraphiQLPath : optionsValue.GraphiQLPath;
graphqlPath = string.IsNullOrEmpty(optionsValue?.GraphQLPath) ? GraphiQLOptions.DefaultGraphQLPath : optionsValue.GraphQLPath;
}
/// <summary>
/// Invokes the middleware with the specified context.
/// </summary>
/// <param name="context">
/// The context.
/// </param>
/// <returns>
/// A <see cref="Task" /> representing the middleware invocation.
/// </returns>
/// <exception cref="ArgumentNullException">
/// Throws <see cref="ArgumentNullException" /> if <paramref name="context" />.
/// </exception>
public async Task Invoke(HttpContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
if (ShouldRespondToRequest(context.Request))
{
await WriteResponseAsync(context.Response).ConfigureAwait(true);
return;
}
await next(context).ConfigureAwait(true);
}
private static string ReadTemplate()
{
return @"
<!--
* Copyright (c) 2015, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the license found in the
* LICENSE file in the root directory of this source tree.
*
-->
<!DOCTYPE html>
<html>
<head>
<style>
body {
height: 100%;
margin: 0;
width: 100%;
overflow: hidden;
}
#graphiql {
height: 100vh;
}
</style>
<title>GraphiQL</title>
<link rel='stylesheet' href='https://cdn.jsdelivr.net/graphiql/0.7.5/graphiql.css' />
<script src='https://cdn.jsdelivr.net/fetch/latest/fetch.min.js'></script>
<script src='https://cdn.jsdelivr.net/react/latest/react.min.js'></script>
<script src='https://cdn.jsdelivr.net/react/latest/react-dom.min.js'></script>
<script src='https://cdn.jsdelivr.net/graphiql/0.7.5/graphiql.min.js'></script>
</head>
<body>
<div id='graphiql'>Loading...</div>
<script>
/**
* This GraphiQL example illustrates how to use some of GraphiQL's props
* in order to enable reading and updating the URL parameters, making
* link sharing of queries a little bit easier.
*
* This is only one example of this kind of feature, GraphiQL exposes
* various React params to enable interesting integrations.
*/
// Parse the search string to get url parameters.
var search = window.location.search;
var parameters = {};
search.substr(1).split('&').forEach(function (entry) {
var eq = entry.indexOf('=');
if (eq >= 0) {
parameters[decodeURIComponent(entry.slice(0, eq))] =
decodeURIComponent(entry.slice(eq + 1));
}
});
// if variables was provided, try to format it.
if (parameters.variables) {
try {
parameters.variables =
JSON.stringify(JSON.parse(parameters.variables), null, 2);
} catch (e) {
// Do nothing, we want to display the invalid JSON as a string, rather
// than present an error.
}
}
// When the query and variables string is edited, update the URL bar so
// that it can be easily shared
function onEditQuery(newQuery) {
parameters.query = newQuery;
updateURL();
}
function onEditVariables(newVariables) {
parameters.variables = newVariables;
updateURL();
}
function onEditOperationName(newOperationName) {
parameters.operationName = newOperationName;
updateURL();
}
function updateURL() {
var newSearch = '?' + Object.keys(parameters).filter(function (key) {
return Boolean(parameters[key]);
}).map(function (key) {
return encodeURIComponent(key) + '=' +
encodeURIComponent(parameters[key]);
}).join('&');
history.replaceState(null, null, newSearch);
}
// Defines a GraphQL fetcher using the fetch API.
function graphQLFetcher(graphQLParams) {
return fetch(window.location.origin + '@{GraphQLPath}', {
method: 'post',
headers: {
'Accept': 'application/json',
'Content-Type': 'application/json',
},
body: JSON.stringify(graphQLParams),
credentials: 'include',
}).then(function (response) {
return response.text();
}).then(function (responseBody) {
try {
return JSON.parse(responseBody);
} catch (error) {
return responseBody;
}
});
}
// Render <GraphiQL /> into the body.
ReactDOM.render(
React.createElement(GraphiQL, {
fetcher: graphQLFetcher,
query: parameters.query,
variables: parameters.variables,
operationName: parameters.operationName,
onEditQuery: onEditQuery,
onEditVariables: onEditVariables,
onEditOperationName: onEditOperationName
}),
document.getElementById('graphiql')
);
</script>
</body>
</html>
";
//var assembly = typeof(IApplicationBuilderExtensions).GetTypeInfo().Assembly;
//var a = assembly.GetManifestResourceNames();
//using (var stream = assembly.GetManifestResourceStream("index.html"))
//using (var streamReader = new StreamReader(stream , Encoding.UTF8))
//{
// return streamReader.ReadToEnd();
//}
}
private bool ShouldRespondToRequest(HttpRequest request)
{
return string.Equals(request.Method , "GET" , StringComparison.OrdinalIgnoreCase) && request.Path.Equals(graphiqlPath);
}
private Task WriteResponseAsync(HttpResponse response)
{
response.ContentType = "text/html";
response.StatusCode = 200;
// TODO: use RazorPageGenerator when ASP.NET Core 1.1 is out...?
var builder = new StringBuilder(Template);
builder.Replace("@{GraphQLPath}" , graphqlPath);
var data = Encoding.UTF8.GetBytes(builder.ToString());
return response.Body.WriteAsync(data , 0 , data.Length);
}
}
}