Issue 991: Add CBOR Decode operation

src/core/config/Categories.json

@@ -62,7 +62,8 @@
             "CSV to JSON",
             "JSON to CSV",
             "Avro to JSON",
-            "CBOR Encode"
+            "CBOR Encode",
+            "CBOR Decode"
         ]
     },
     {

src/core/operations/CBORDecode.mjs

@@ -0,0 +1,42 @@
+/**
+ * @author Danh4 [dan.h4@ncsc.gov.uk]
+ * @copyright Crown Copyright 2020
+ * @license Apache-2.0
+ */
+
+import Operation from "../Operation.mjs";
+import Cbor from "cbor";
+
+/**
+ * CBOR Decode operation
+ */
+class CBORDecode extends Operation {
+
+    /**
+     * CBORDecode constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "CBOR Decode";
+        this.module = "Default";
+        this.description = "Decode Concise Binary Object Representation (CBOR) data format (RFC7049) to JSON.";
+        this.infoURL = "https://cbor.io";
+        this.inputType = "ArrayBuffer";
+        this.outputType = "JSON";
+        this.args = [
+        ];
+    }
+
+    /**
+     * @param {ArrayBuffer} input
+     * @param {Object[]} args
+     * @returns {JSON}
+     */
+    run(input, args) {
+        return Cbor.decodeFirstSync(Buffer.from(input).toString("hex"));
+    }
+
+}
+
+export default CBORDecode;

tests/operations/index.mjs

@@ -102,6 +102,7 @@ import "./tests/CipherSaber2.mjs";
 import "./tests/Colossus.mjs";
 import "./tests/ParseObjectIDTimestamp.mjs";
 import "./tests/CBOREncode.mjs";
+import "./tests/CBORDecode.mjs";
 
 
 // Cannot test operations that use the File type yet

tests/operations/tests/CBORDecode.mjs

@@ -0,0 +1,145 @@
+/**
+ * From Hex Tests.
+ *
+ * @author Danh4 [dan.h4@ncsc.gov.uk]
+ *
+ * @copyright Crown Copyright 2019
+ * @license Apache-2.0
+ */
+
+import TestRegister from "../../lib/TestRegister.mjs";
+
+TestRegister.addTests([
+    {
+        name: "CBOR Decode: Can decode integer",
+        input: "0f",
+        expectedOutput: "15",
+        recipeConfig: [
+            {
+                op: "From Hex",
+                args: []
+            },
+            {
+                op: "CBOR Decode",
+                args: []
+            }
+        ]
+    },
+    {
+        name: "CBOR Decode: Can decode decimal",
+        input: "f9 3e 00",
+        expectedOutput: "1.5",
+        recipeConfig: [
+            {
+                op: "From Hex",
+                args: []
+            },
+            {
+                op: "CBOR Decode",
+                args: []
+            }
+        ]
+    },
+    {
+        name: "From Hex: Can decode text",
+        input: "64 54 65 78 74",
+        expectedOutput: "\"Text\"",
+        recipeConfig: [
+            {
+                op: "From Hex",
+                args: []
+            },
+            {
+                op: "CBOR Decode",
+                args: []
+            }
+        ]
+    },
+    {
+        name: "From Hex: Can decode boolean true",
+        input: "f5",
+        expectedOutput: "true",
+        recipeConfig: [
+            {
+                op: "From Hex",
+                args: []
+            },
+            {
+                op: "CBOR Decode",
+                args: []
+            }
+        ]
+    },
+    {
+        name: "From Hex: Can decode boolean false",
+        input: "f4",
+        expectedOutput: "false",
+        recipeConfig: [
+            {
+                op: "From Hex",
+                args: []
+            },
+            {
+                op: "CBOR Decode",
+                args: []
+            }
+        ]
+    },
+    {
+        name: "From Hex: Can decode map",
+        input: "a3 61 61 01 61 62 02 61 63 03",
+        expectedOutput: JSON.stringify({a: 1, b: 2, c: 3}),
+        recipeConfig: [
+            {
+                op: "From Hex",
+                args: []
+            },
+            {
+                op: "CBOR Decode",
+                args: []
+            },
+            {
+                op: "JSON Minify",
+                args: []
+            }
+        ]
+    },
+    {
+        name: "From Hex: Can decode list",
+        input: "83 00 01 02",
+        expectedOutput: "[0,1,2]",
+        recipeConfig: [
+            {
+                op: "From Hex",
+                args: []
+            },
+            {
+                op: "CBOR Decode",
+                args: []
+            },
+            {
+                op: "JSON Minify",
+                args: []
+            }
+        ]
+    },
+    {
+        name: "From Hex: Can round trip with encode",
+        input: JSON.stringify({a: 1, b: false, c: [1, 2, 3]}),
+        expectedOutput: JSON.stringify({a: 1, b: false, c: [1, 2, 3]}),
+        recipeConfig: [
+            {
+                op: "CBOR Encode",
+                args: []
+            },
+            {
+                op: "CBOR Decode",
+                args: []
+            },
+            {
+                op: "JSON Minify",
+                args: []
+            }
+        ]
+    }
+]);