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Add ToJson for DynamoDBEvent #1685
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157 changes: 157 additions & 0 deletions
157
Libraries/src/Amazon.Lambda.DynamoDBEvents/ExtensionMethods.cs
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,157 @@ | ||
| using System.Collections.Generic; | ||
| using System.IO; | ||
| using System.Text; | ||
| using System.Text.Json; | ||
| using static Amazon.Lambda.DynamoDBEvents.DynamoDBEvent; | ||
|
|
||
| namespace Amazon.Lambda.DynamoDBEvents | ||
| { | ||
| /// <summary> | ||
| /// Extension methods for working with <see cref="DynamoDBEvent"/> | ||
| /// </summary> | ||
| public static class ExtensionMethods | ||
| { | ||
| /// <summary> | ||
| /// Converts a dictionary representing a DynamoDB item to a JSON string. | ||
| /// This may be useful when casting a DynamoDB Lambda event to the AWS SDK's | ||
| /// higher-level document and object persistence classes. | ||
| /// </summary> | ||
| /// <param name="item">Dictionary representing a DynamoDB item</param> | ||
| /// <returns>Unformatted JSON string representing the DynamoDB item</returns> | ||
| public static string ToJson(this Dictionary<string, AttributeValue> item) | ||
| { | ||
| return ToJson(item, false); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Converts a dictionary representing a DynamoDB item to a JSON string. | ||
| /// This may be useful when casting a DynamoDB Lambda event to the AWS SDK's | ||
| /// higher-level document and object persistence classes. | ||
| /// </summary> | ||
| /// <param name="item">Dictionary representing a DynamoDB item</param> | ||
| /// <returns>Formatted JSON string representing the DynamoDB item</returns> | ||
| public static string ToJsonPretty(this Dictionary<string, AttributeValue> item) | ||
| { | ||
| return ToJson(item, true); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Internal entry point for converting a dictionary representing a DynamoDB item to a JSON string. | ||
| /// </summary> | ||
| /// <param name="item">Dictionary representing a DynamoDB item</param> | ||
| /// <param name="prettyPrint">Whether the resulting JSON should be formatted</param> | ||
| /// <returns>JSON string representing the DynamoDB item</returns> | ||
| private static string ToJson(Dictionary<string, AttributeValue> item, bool prettyPrint) | ||
| { | ||
| if (item == null || item.Count == 0) | ||
| { | ||
| return "{}"; | ||
| } | ||
|
|
||
| using var stream = new MemoryStream(); | ||
| using var writer = new Utf8JsonWriter(stream, new JsonWriterOptions { Indented = prettyPrint}); | ||
|
|
||
| WriteJson(writer, item); | ||
|
|
||
| writer.Flush(); | ||
| return Encoding.UTF8.GetString(stream.ToArray()); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Writes a single DynamoDB attribute as a json. May be called recursively for maps. | ||
| /// </summary> | ||
| /// <param name="writer">JSON writer</param> | ||
| /// <param name="item">Dictionary representing a DynamoDB item, or a map within an item</param> | ||
| private static void WriteJson(Utf8JsonWriter writer, Dictionary<string, AttributeValue> item) | ||
| { | ||
| writer.WriteStartObject(); | ||
|
|
||
| foreach (var attribute in item) | ||
| { | ||
| writer.WritePropertyName(attribute.Key); | ||
| WriteJsonValue(writer, attribute.Value); | ||
| } | ||
|
|
||
| writer.WriteEndObject(); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// Writes a single DynamoDB attribute value as a json value | ||
| /// </summary> | ||
| /// <param name="writer">JSON writer</param> | ||
| /// <param name="attribute">DynamoDB attribute</param> | ||
| private static void WriteJsonValue(Utf8JsonWriter writer, AttributeValue attribute) | ||
| { | ||
| if (attribute.S != null) | ||
| { | ||
| writer.WriteStringValue(attribute.S); | ||
| } | ||
| else if (attribute.N != null) | ||
| { | ||
| #if NETCOREAPP3_1 // WriteRawValue was added in .NET 6, but we need to write out Number values without quotes | ||
| using var document = JsonDocument.Parse(attribute.N); | ||
| document.WriteTo(writer); | ||
| #else | ||
| writer.WriteRawValue(attribute.N); | ||
| #endif | ||
| } | ||
| else if (attribute.B != null) | ||
| { | ||
| writer.WriteBase64StringValue(attribute.B.ToArray()); | ||
| } | ||
| else if (attribute.BOOL != null) | ||
| { | ||
| writer.WriteBooleanValue(attribute.BOOL.Value); | ||
| } | ||
| else if (attribute.NULL != null) | ||
| { | ||
| writer.WriteNullValue(); | ||
| } | ||
| else if (attribute.M != null) | ||
| { | ||
| WriteJson(writer, attribute.M); | ||
| } | ||
| else if (attribute.L != null) | ||
| { | ||
| writer.WriteStartArray(); | ||
| foreach (var item in attribute.L) | ||
| { | ||
| WriteJsonValue(writer, item); | ||
| } | ||
| writer.WriteEndArray(); | ||
| } | ||
| else if (attribute.SS != null) | ||
| { | ||
| writer.WriteStartArray(); | ||
| foreach (var item in attribute.SS) | ||
| { | ||
| writer.WriteStringValue(item); | ||
| } | ||
| writer.WriteEndArray(); | ||
| } | ||
| else if (attribute.NS != null) | ||
| { | ||
| writer.WriteStartArray(); | ||
| foreach (var item in attribute.NS) | ||
| { | ||
| #if NETCOREAPP3_1 // WriteRawValue was added in .NET 6, but we need to write out Number values without quotes | ||
| using var document = JsonDocument.Parse(item); | ||
| document.WriteTo(writer); | ||
| #else | ||
| writer.WriteRawValue(item); | ||
| #endif | ||
| } | ||
| writer.WriteEndArray(); | ||
| } | ||
| else if (attribute.BS != null) | ||
| { | ||
| writer.WriteStartArray(); | ||
| foreach (var item in attribute.BS) | ||
| { | ||
| writer.WriteBase64StringValue(item.ToArray()); | ||
| } | ||
| writer.WriteEndArray(); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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