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All rights reserved.\r\n// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.\r\n\r\nimport { CompletionMessage, HubMessage, IHubProtocol, InvocationMessage, MessageType, StreamItemMessage } from \"./IHubProtocol\";\r\nimport { ILogger, LogLevel } from \"./ILogger\";\r\nimport { TransferFormat } from \"./ITransport\";\r\nimport { NullLogger } from \"./Loggers\";\r\nimport { TextMessageFormat } from \"./TextMessageFormat\";\r\n\r\nconst JSON_HUB_PROTOCOL_NAME: string = \"json\";\r\n\r\n/** Implements the JSON Hub Protocol. */\r\nexport class JsonHubProtocol implements IHubProtocol {\r\n\r\n /** @inheritDoc */\r\n public readonly name: string = JSON_HUB_PROTOCOL_NAME;\r\n /** @inheritDoc */\r\n public readonly version: number = 1;\r\n\r\n /** @inheritDoc */\r\n public readonly transferFormat: TransferFormat = TransferFormat.Text;\r\n\r\n /** Creates an array of {@link @aspnet/signalr.HubMessage} objects from the specified serialized representation.\r\n *\r\n * @param {string} input A string containing the serialized representation.\r\n * @param {ILogger} logger A logger that will be used to log messages that occur during parsing.\r\n */\r\n public parseMessages(input: string, logger: ILogger): HubMessage[] {\r\n // The interface does allow \"ArrayBuffer\" to be passed in, but this implementation does not. So let's throw a useful error.\r\n if (typeof input !== \"string\") {\r\n throw new Error(\"Invalid input for JSON hub protocol. Expected a string.\");\r\n }\r\n\r\n if (!input) {\r\n return [];\r\n }\r\n\r\n if (logger === null) {\r\n logger = NullLogger.instance;\r\n }\r\n\r\n // Parse the messages\r\n const messages = TextMessageFormat.parse(input);\r\n\r\n const hubMessages = [];\r\n for (const message of messages) {\r\n const parsedMessage = JSON.parse(message) as HubMessage;\r\n if (typeof parsedMessage.type !== \"number\") {\r\n throw new Error(\"Invalid payload.\");\r\n }\r\n switch (parsedMessage.type) {\r\n case MessageType.Invocation:\r\n this.isInvocationMessage(parsedMessage);\r\n break;\r\n case MessageType.StreamItem:\r\n this.isStreamItemMessage(parsedMessage);\r\n break;\r\n case MessageType.Completion:\r\n this.isCompletionMessage(parsedMessage);\r\n break;\r\n case MessageType.Ping:\r\n // Single value, no need to validate\r\n break;\r\n case MessageType.Close:\r\n // All optional values, no need to validate\r\n break;\r\n default:\r\n // Future protocol changes can add message types, old clients can ignore them\r\n logger.log(LogLevel.Information, \"Unknown message type '\" + parsedMessage.type + \"' ignored.\");\r\n continue;\r\n }\r\n hubMessages.push(parsedMessage);\r\n }\r\n\r\n return hubMessages;\r\n }\r\n\r\n /** Writes the specified {@link @aspnet/signalr.HubMessage} to a string and returns it.\r\n *\r\n * @param {HubMessage} message The message to write.\r\n * @returns {string} A string containing the serialized representation of the message.\r\n */\r\n public writeMessage(message: HubMessage): string {\r\n return TextMessageFormat.write(JSON.stringify(message));\r\n }\r\n\r\n private isInvocationMessage(message: InvocationMessage): void {\r\n this.assertNotEmptyString(message.target, \"Invalid payload for Invocation message.\");\r\n\r\n if (message.invocationId !== undefined) {\r\n this.assertNotEmptyString(message.invocationId, \"Invalid payload for Invocation message.\");\r\n }\r\n }\r\n\r\n private isStreamItemMessage(message: StreamItemMessage): void {\r\n this.assertNotEmptyString(message.invocationId, \"Invalid payload for StreamItem message.\");\r\n\r\n if (message.item === undefined) {\r\n throw new Error(\"Invalid payload for StreamItem message.\");\r\n }\r\n }\r\n\r\n private isCompletionMessage(message: CompletionMessage): void {\r\n if (message.result && message.error) {\r\n throw new Error(\"Invalid payload for Completion message.\");\r\n }\r\n\r\n if (!message.result && message.error) {\r\n this.assertNotEmptyString(message.error, \"Invalid payload for Completion message.\");\r\n }\r\n\r\n this.assertNotEmptyString(message.invocationId, \"Invalid payload for Completion message.\");\r\n }\r\n\r\n private assertNotEmptyString(value: any, errorMessage: string): void {\r\n if (typeof value !== \"string\" || value === \"\") {\r\n throw new Error(errorMessage);\r\n }\r\n }\r\n}\r\n"]}
