99designs · molaga · Sep 11, 2024
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
@@ -8,19 +8,19 @@ Our [discord](https://discord.gg/DYEq3EMs4U) server is the best place to ask que
 
 ## Reporting Bugs and Issues
 
- We use [GitHub Issues](https://github.com/99designs/gqlgen/issues) to track bugs, so please do a search before submitting to ensure your problem isn't already tracked.
+We use [GitHub Issues](https://github.com/99designs/gqlgen/issues) to track bugs, so please do a search before submitting to ensure your problem isn't already tracked.
 
 ### New Issues
 
 Please provide the expected and observed behaviours in your issue. A minimal GraphQL schema or configuration file should be provided where appropriate.
 
 ## Proposing a Change
 
-If you intend to implement a feature for gqlgen, or make a non-trivial change to the current implementation, we recommend [first filing an issue](https://github.com/99designs/gqlgen/issues/new) marked with the `proposal` tag, so that the engineering team can provide guidance and feedback on the direction of an implementation.  This also help ensure that other people aren't also working on the same thing.
+If you intend to implement a feature for gqlgen, or make a non-trivial change to the current implementation, we recommend [first filing an issue](https://github.com/99designs/gqlgen/issues/new) marked with the `proposal` tag, so that the engineering team can provide guidance and feedback on the direction of an implementation. This also help ensure that other people aren't also working on the same thing.
 
 Bug fixes are welcome and should come with appropriate test coverage.
 
-New features should be made against the `next` branch.
+New features should be made against the `master` branch.
 
 ### License
 

diff --git a/graphql/playground/altair_playground.go b/graphql/playground/altair_playground.go
@@ -64,7 +64,7 @@ var altairPage = template.Must(template.New("altair").Parse(`<!doctype html>
 </html>`))
 
 // AltairHandler responsible for setting up the altair playground
-func AltairHandler(title, endpoint string) http.HandlerFunc {
+func AltairHandler(title, endpoint string, options ...func(*PlaygroundOpts)) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
 		err := altairPage.Execute(w, map[string]any{
 			"title":                title,

diff --git a/graphql/playground/apollo_sandbox_playground_test.go b/graphql/playground/apollo_sandbox_playground_test.go
@@ -6,7 +6,7 @@ import (
 )
 
 func TestApolloSandboxHandler_Integrity(t *testing.T) {
-	testResourceIntegrity(t, func(title, endpoint string) http.HandlerFunc {
+	testResourceIntegrity(t, func(title, endpoint string, options ...func(*PlaygroundOpts)) http.HandlerFunc {
 		return ApolloSandboxHandler(title, endpoint)
 	})
 }
diff --git a/graphql/playground/helper_test.go b/graphql/playground/helper_test.go
@@ -14,7 +14,7 @@ import (
 	"github.com/stretchr/testify/require"
 )
 
-func testResourceIntegrity(t *testing.T, handler func(title, endpoint string) http.HandlerFunc) {
+func testResourceIntegrity(t *testing.T, handler func(title, endpoint string, options ...func(*PlaygroundOpts)) http.HandlerFunc) {
 	recorder := httptest.NewRecorder()
 	request := httptest.NewRequest(http.MethodGet, "http://localhost:8080/", http.NoBody)
 	handler("example.org API", "/query").ServeHTTP(recorder, request)

diff --git a/graphql/playground/playground.go b/graphql/playground/playground.go
@@ -75,7 +75,8 @@ var page = template.Must(template.New("graphiql").Parse(`<!DOCTYPE html>
           fetcher: fetcher,
           isHeadersEditorEnabled: true,
           shouldPersistHeaders: true,
-		  headers: JSON.stringify(uiHeaders, null, 2)
+          headers: JSON.stringify(uiHeaders, null, 2),
+          defaultQuery: {{.defaultQuery}}
         }),
         document.getElementById('graphiql'),
       );
@@ -84,24 +85,43 @@ var page = template.Must(template.New("graphiql").Parse(`<!DOCTYPE html>
 </html>
 `))
 
+// PlaygroundOpts contains options for configuring the GraphQL Playground
+type PlaygroundOpts struct {
+	Title        string
+	Endpoint     string
+	DefaultQuery string
+}
+
+// WithDefaultQuery sets the default query for the playground
+func WithDefaultQuery(query string) func(*PlaygroundOpts) {
+	return func(opts *PlaygroundOpts) {
+		opts.DefaultQuery = query
+	}
+}
+
 // Handler responsible for setting up the playground
-func Handler(title, endpoint string) http.HandlerFunc {
-	return HandlerWithHeaders(title, endpoint, nil, nil)
+func Handler(title, endpoint string, options ...func(*PlaygroundOpts)) http.HandlerFunc {
+	opts := initOpts(title, endpoint, options...)
+
+	return HandlerWithHeaders(opts.Title, opts.Endpoint, nil, nil, options...)
 }
 
 // HandlerWithHeaders sets up the playground.
 // fetcherHeaders are used by the playground's fetcher instance and will not be visible in the UI.
 // uiHeaders are default headers that will show up in the UI headers editor.
-func HandlerWithHeaders(title, endpoint string, fetcherHeaders, uiHeaders map[string]string) http.HandlerFunc {
-	return func(w http.ResponseWriter, r *http.Request) {
+func HandlerWithHeaders(title, endpoint string, fetcherHeaders, uiHeaders map[string]string, options ...func(*PlaygroundOpts)) http.HandlerFunc {
+	opts := initOpts(title, endpoint, options...)
+
+	return func(w http.ResponseWriter, _ *http.Request) {
 		w.Header().Add("Content-Type", "text/html; charset=UTF-8")
 		err := page.Execute(w, map[string]any{
-			"title":                title,
-			"endpoint":             endpoint,
+			"title":                opts.Title,
+			"endpoint":             opts.Endpoint,
 			"fetcherHeaders":       fetcherHeaders,
 			"uiHeaders":            uiHeaders,
-			"endpointIsAbsolute":   endpointHasScheme(endpoint),
-			"subscriptionEndpoint": getSubscriptionEndpoint(endpoint),
+			"endpointIsAbsolute":   endpointHasScheme(opts.Endpoint),
+			"subscriptionEndpoint": getSubscriptionEndpoint(opts.Endpoint),
+			"defaultQuery":         opts.DefaultQuery,
 			"version":              "3.0.6",
 			"cssSRI":               "sha256-wTzfn13a+pLMB5rMeysPPR1hO7x0SwSeQI+cnw7VdbE=",
 			"jsSRI":                "sha256-eNxH+Ah7Z9up9aJYTQycgyNuy953zYZwE9Rqf5rH+r4=",
@@ -114,6 +134,18 @@ func HandlerWithHeaders(title, endpoint string, fetcherHeaders, uiHeaders map[st
 	}
 }
 
+// initOpts initializes the playground options with the given title and endpoint.
+func initOpts(title, endpoint string, optFuncs ...func(*PlaygroundOpts)) *PlaygroundOpts {
+	opts := &PlaygroundOpts{
+		Title:    title,
+		Endpoint: endpoint,
+	}
+	for _, optFunc := range optFuncs {
+		optFunc(opts)
+	}
+	return opts
+}
+
 // endpointHasScheme checks if the endpoint has a scheme.
 func endpointHasScheme(endpoint string) bool {
 	u, err := url.Parse(endpoint)