Ported Image operations + some cleanup

src/core/operations/RenderImage.mjs

@@ -0,0 +1,91 @@
+/**
+ * @author tlwr [toby@toby.codes]
+ * @copyright Crown Copyright 2017
+ * @license Apache-2.0
+ */
+
+import { fromBase64, toBase64 } from "../lib/Base64";
+import { fromHex } from "../lib/Hex";
+import Operation from "../Operation";
+import Utils from "../Utils";
+import Magic from "../lib/Magic";
+
+/**
+ * Render Image operation
+ */
+class RenderImage extends Operation {
+
+    /**
+     * RenderImage constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "Render Image";
+        this.module = "Image";
+        this.description = "Displays the input as an image. Supports the following formats:<br><br><ul><li>jpg/jpeg</li><li>png</li><li>gif</li><li>webp</li><li>bmp</li><li>ico</li></ul>";
+        this.inputType = "string";
+        this.outputType = "html";
+        this.args = [
+            {
+                "name": "Input format",
+                "type": "option",
+                "value": ["Raw", "Base64", "Hex"]
+            }
+        ];
+        this.patterns = [
+            {
+                "match": "^(?:\\xff\\xd8\\xff|\\x89\\x50\\x4e\\x47|\\x47\\x49\\x46|.{8}\\x57\\x45\\x42\\x50|\\x42\\x4d)",
+                "flags": "",
+                "args": [
+                    "Raw"
+                ],
+                "useful": true
+            }
+        ];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {html}
+     */
+    run(input, args) {
+        const inputFormat = args[0];
+        let dataURI = "data:";
+
+        if (!input.length) return "";
+
+        // Convert input to raw bytes
+        switch (inputFormat) {
+            case "Hex":
+                input = fromHex(input);
+                break;
+            case "Base64":
+                // Don't trust the Base64 entered by the user.
+                // Unwrap it first, then re-encode later.
+                input = fromBase64(input, undefined, "byteArray");
+                break;
+            case "Raw":
+            default:
+                input = Utils.strToByteArray(input);
+                break;
+        }
+
+        // Determine file type
+        const type = Magic.magicFileType(input);
+        if (type && type.mime.indexOf("image") === 0) {
+            dataURI += type.mime + ";";
+        } else {
+            throw "Invalid file type";
+        }
+
+        // Add image data to URI
+        dataURI += "base64," + toBase64(input);
+
+        return "<img src='" + dataURI + "'>";
+    }
+
+}
+
+export default RenderImage;