Added Base64 to text decoding.

Author: rudimuc

Base64.ts

@@ -13,3 +13,23 @@ export class Base64Encoder implements Coder {
                 return typeof text === "string" && text.length > 0;
         }
 }
+
+export class Base64Decoder implements Coder {
+
+    from = "base64";
+    to = "text";
+
+    transform(text: string): string {
+        try {
+            return atob(text);
+        } catch (e) {
+            throw new Error("Invalid Base64 input");
+        }
+    }
+
+    checkInput(text: string): boolean {
+        // Check if the input is a valid Base64 string
+        const base64Regex = /^[A-Za-z0-9+/=]+$/;
+        return typeof text === "string" && base64Regex.test(text) && text.length % 4 === 0;
+    }
+}

main.ts

@@ -1,16 +1,17 @@
 import { App, MarkdownView, Plugin, MarkdownPostProcessorContext, PluginSettingTab, Setting } from 'obsidian';
 
 import { Coder } from "./Coder";
-import { Base64Encoder } from "./Base64";
+import { Base64Encoder, Base64Decoder } from "./Base64";
 import { Rot13Encoder, Rot13Decoder } from "./Rot13";
 
 export default class CoderPlugin extends Plugin {
 
 	// List of coders
-	coders: Coder[] = [new Base64Encoder(), new Rot13Encoder(), new Rot13Decoder()];
+	coders: Coder[] = [new Base64Encoder(), new Base64Decoder(), new Rot13Encoder(), new Rot13Decoder()];
 
 	async onload() {
 		this.registerMarkdownCodeBlockProcessor('transform-text-base64', this.processTextToBase64);
+		this.registerMarkdownCodeBlockProcessor('transform-base64-text', this.processBase64ToText);
 		this.registerMarkdownCodeBlockProcessor('transform-text-rot13', this.processTextToRot13);
 		this.registerMarkdownCodeBlockProcessor('transform-rot13-text', this.processRot13ToText);
 	}
@@ -34,6 +35,11 @@ export default class CoderPlugin extends Plugin {
 		this.processText(content, el, coder);
 	}
 
+	processBase64ToText = async (content: string, el: HTMLElement, ctx: MarkdownPostProcessorContext) => {
+		let coder = this.getCoder("base64", "text");
+		this.processText(content, el, coder);
+	}
+
 	processTextToRot13 = async (content: string, el: HTMLElement, ctx: MarkdownPostProcessorContext) => {
 		let coder = this.getCoder("text", "rot13");
 		this.processText(content, el, coder);