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Apollo iOS with AppSync custom body request: AppSyncRequestBodyCreator
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| /// Creates an AWS AppSync-compatible RequestBody `payload` for subscriptions. | |
| /// This is necessary due to the different payload used by Apollo | |
| /// Credit to: | |
| /// - https://community.apollographql.com/t/using-apollo-with-appsync-directly-on-ios/324/4 | |
| /// - https://docs.aws.amazon.com/appsync/latest/devguide/real-time-websocket-client.html#header-parameter-format-based-on-appsync-api-authorization-mode | |
| /// - https://github.com/lingfengmarskey/NetworkSample | |
| /// | |
| /// AppSync payload: | |
| /// { | |
| /// "id": "subscriptionId", | |
| /// "type": "start", | |
| /// "payload": { | |
| /// "data": { // Data object as a string value | |
| /// "query": "query string", | |
| /// "variables": "variables" | |
| /// }, | |
| /// "extensions": { | |
| /// "authorization": { | |
| /// "host": "host", | |
| /// "Authorization": "AccessToken" | |
| /// } | |
| /// } | |
| /// } | |
| /// } | |
| public class AppSyncRequestBodyCreator: RequestBodyCreator { | |
| private var accessToken: String | |
| init(accessToken: String) { | |
| self.accessToken = accessToken | |
| } | |
| public func requestBody<Operation: GraphQLOperation>(for operation: Operation, | |
| sendQueryDocument: Bool, | |
| autoPersistQuery: Bool ) -> JSONEncodableDictionary { | |
| let authorization = buildAuthenticationPayload(accessToken: accessToken) | |
| var body: JSONEncodableDictionary = [ "operationName": Operation.operationName ] | |
| var dataDictionary = JSONEncodableDictionary() | |
| if let variables = operation.__variables { | |
| dataDictionary["variables"] = variables._jsonEncodableObject | |
| } | |
| if sendQueryDocument { | |
| guard let document = Operation.definition?.queryDocument else { | |
| preconditionFailure("To send query documents, Apollo types must be generated with `OperationDefinition`s.") | |
| } | |
| dataDictionary["query"] = document | |
| } | |
| guard let dataJson = dataDictionary.toData() else { | |
| preconditionFailure("query and variables are not a valid JSON") | |
| } | |
| body["data"] = String(decoding: dataJson, as: UTF8.self) | |
| if autoPersistQuery { | |
| guard let operationIdentifier = Operation.operationIdentifier else { | |
| preconditionFailure("To enable `autoPersistQueries`, Apollo types must be generated with operationIdentifiers") | |
| } | |
| body["extensions"] = [ | |
| "persistedQuery": ["sha256Hash": operationIdentifier, "version": 1], | |
| "authorization": authorization ] | |
| } else { | |
| body["extensions"] = ["authorization": authorization] | |
| } | |
| return body | |
| } | |
| /// Build the authentication payload for the WebSocket connection | |
| /// { | |
| /// "host": "<host>", | |
| /// "Authorization": "Authorization" | |
| /// } | |
| private func buildAuthenticationPayload(accessToken: String) -> JSONEncodableDictionary { | |
| let host = graphQlUrl | |
| .replacingOccurrences(of: "https://", with: "") | |
| .replacingOccurrences(of: "/graphql", with: "") | |
| let authPayload: JSONEncodableDictionary = ["host": host, | |
| "Authorization": "\(accessToken)"] | |
| return authPayload | |
| } | |
| } |
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