feat(gql-parsing): Only attempt to parse request body if content leng… (#40)

Fix panic when trying to read request body without there being one.

---------

Co-authored-by: ldebruijn <[email protected]>

Author: ldebruijn

internal/business/gql/gql.go

@@ -22,6 +22,10 @@ type PersistedQuery struct {
 }
 
 func ParseRequestPayload(r *http.Request) ([]RequestData, error) {
+	if r.ContentLength < 1 {
+		return []RequestData{}, nil
+	}
+
 	body, err := io.ReadAll(r.Body)
 	if err != nil {
 		return []RequestData{}, err

internal/business/gql/gql_test.go

@@ -97,6 +97,16 @@ func TestParseRequestPayload(t *testing.T) {
 			},
 			wantErr: false,
 		},
+		{
+			name: "Handles request without body gracefully",
+			args: args{
+				r: func() *http.Request {
+					return httptest.NewRequest("POST", "/graphql", nil)
+				}(),
+			},
+			want:    []RequestData{},
+			wantErr: false,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {