first WIP

main.ts

@@ -1,4 +1,5 @@
-import { App, Editor, MarkdownView, Modal, Notice, Plugin, PluginSettingTab, Setting } from 'obsidian';
+import { App, MarkdownView, Plugin, PluginSettingTab, Setting } from "obsidian";
+import { encryptMarkdown } from "src/encryption";
 
 // Remember to rename these classes and interfaces!
 
@@ -7,8 +8,8 @@ interface MyPluginSettings {
 }
 
 const DEFAULT_SETTINGS: MyPluginSettings = {
-	mySetting: 'default'
-}
+	mySetting: "default",
+};
 
 export default class MyPlugin extends Plugin {
 	settings: MyPluginSettings;
@@ -16,74 +17,45 @@ export default class MyPlugin extends Plugin {
 	async onload() {
 		await this.loadSettings();
 
-		// This creates an icon in the left ribbon.
-		const ribbonIconEl = this.addRibbonIcon('dice', 'Sample Plugin', (evt: MouseEvent) => {
-			// Called when the user clicks the icon.
-			new Notice('This is a notice!');
-		});
-		// Perform additional things with the ribbon
-		ribbonIconEl.addClass('my-plugin-ribbon-class');
-
-		// This adds a status bar item to the bottom of the app. Does not work on mobile apps.
-		const statusBarItemEl = this.addStatusBarItem();
-		statusBarItemEl.setText('Status Bar Text');
-
-		// This adds a simple command that can be triggered anywhere
-		this.addCommand({
-			id: 'open-sample-modal-simple',
-			name: 'Open sample modal (simple)',
-			callback: () => {
-				new SampleModal(this.app).open();
-			}
-		});
-		// This adds an editor command that can perform some operation on the current editor instance
-		this.addCommand({
-			id: 'sample-editor-command',
-			name: 'Sample editor command',
-			editorCallback: (editor: Editor, view: MarkdownView) => {
-				console.log(editor.getSelection());
-				editor.replaceSelection('Sample Editor Command');
-			}
-		});
 		// This adds a complex command that can check whether the current state of the app allows execution of the command
 		this.addCommand({
-			id: 'open-sample-modal-complex',
-			name: 'Open sample modal (complex)',
+			id: "open-sample-modal-complex",
+			name: "Open sample modal (complex)",
 			checkCallback: (checking: boolean) => {
 				// Conditions to check
-				const markdownView = this.app.workspace.getActiveViewOfType(MarkdownView);
+				const markdownView =
+					this.app.workspace.getActiveViewOfType(MarkdownView);
 				if (markdownView) {
 					// If checking is true, we're simply "checking" if the command can be run.
 					// If checking is false, then we want to actually perform the operation.
 					if (!checking) {
-						new SampleModal(this.app).open();
+						this.shareNote(markdownView);
 					}
 
 					// This command will only show up in Command Palette when the check function returns true
 					return true;
 				}
-			}
+			},
 		});
 
 		// This adds a settings tab so the user can configure various aspects of the plugin
 		this.addSettingTab(new SampleSettingTab(this.app, this));
-
-		// If the plugin hooks up any global DOM events (on parts of the app that doesn't belong to this plugin)
-		// Using this function will automatically remove the event listener when this plugin is disabled.
-		this.registerDomEvent(document, 'click', (evt: MouseEvent) => {
-			console.log('click', evt);
-		});
-
-		// When registering intervals, this function will automatically clear the interval when the plugin is disabled.
-		this.registerInterval(window.setInterval(() => console.log('setInterval'), 5 * 60 * 1000));
 	}
 
-	onunload() {
-
+	// ENCRYPT AND SHARE MD NOTE
+	private shareNote(mdView: MarkdownView) {
+		const cryptData = encryptMarkdown(mdView);
+		console.log(cryptData);
 	}
 
+	onunload() {}
+
 	async loadSettings() {
-		this.settings = Object.assign({}, DEFAULT_SETTINGS, await this.loadData());
+		this.settings = Object.assign(
+			{},
+			DEFAULT_SETTINGS,
+			await this.loadData()
+		);
 	}
 
 	async saveSettings() {
@@ -91,22 +63,6 @@ export default class MyPlugin extends Plugin {
 	}
 }
 
-class SampleModal extends Modal {
-	constructor(app: App) {
-		super(app);
-	}
-
-	onOpen() {
-		const {contentEl} = this;
-		contentEl.setText('Woah!');
-	}
-
-	onClose() {
-		const {contentEl} = this;
-		contentEl.empty();
-	}
-}
-
 class SampleSettingTab extends PluginSettingTab {
 	plugin: MyPlugin;
 
@@ -116,22 +72,24 @@ class SampleSettingTab extends PluginSettingTab {
 	}
 
 	display(): void {
-		const {containerEl} = this;
+		const { containerEl } = this;
 
 		containerEl.empty();
 
-		containerEl.createEl('h2', {text: 'Settings for my awesome plugin.'});
+		containerEl.createEl("h2", { text: "Settings for my awesome plugin." });
 
 		new Setting(containerEl)
-			.setName('Setting #1')
-			.setDesc('It\'s a secret')
-			.addText(text => text
-				.setPlaceholder('Enter your secret')
-				.setValue(this.plugin.settings.mySetting)
-				.onChange(async (value) => {
-					console.log('Secret: ' + value);
-					this.plugin.settings.mySetting = value;
-					await this.plugin.saveSettings();
-				}));
+			.setName("Setting #1")
+			.setDesc("It's a secret")
+			.addText((text) =>
+				text
+					.setPlaceholder("Enter your secret")
+					.setValue(this.plugin.settings.mySetting)
+					.onChange(async (value) => {
+						console.log("Secret: " + value);
+						this.plugin.settings.mySetting = value;
+						await this.plugin.saveSettings();
+					})
+			);
 	}
 }

manifest.json

@@ -1,6 +1,6 @@
 {
 	"id": "obsidian-sample-plugin",
-	"name": "Sample Plugin",
+	"name": "Obsidian Note Sharing (working title)",
 	"version": "1.0.1",
 	"minAppVersion": "0.12.0",
 	"description": "This is a sample plugin for Obsidian. This plugin demonstrates some of the capabilities of the Obsidian API.",

package.json

@@ -6,19 +6,27 @@
 	"scripts": {
 		"dev": "node esbuild.config.mjs",
 		"build": "tsc -noEmit -skipLibCheck && node esbuild.config.mjs production",
+		"test": "vitest",
+		"coverage": "vitest run --coverage",
 		"version": "node version-bump.mjs && git add manifest.json versions.json"
 	},
 	"keywords": [],
 	"author": "",
 	"license": "MIT",
 	"devDependencies": {
+		"@types/crypto-js": "^4.1.1",
 		"@types/node": "^16.11.6",
 		"@typescript-eslint/eslint-plugin": "^5.2.0",
 		"@typescript-eslint/parser": "^5.2.0",
 		"builtin-modules": "^3.2.0",
+		"c8": "^7.11.3",
 		"esbuild": "0.13.12",
 		"obsidian": "latest",
 		"tslib": "2.3.1",
-		"typescript": "4.4.4"
+		"typescript": "4.4.4",
+		"vitest": "^0.15.1"
+	},
+	"dependencies": {
+		"crypto-js": "^4.1.1"
 	}
 }

src/crypto.test.ts

@@ -0,0 +1,38 @@
+import { describe, expect, it } from "vitest";
+import { encryptString, decryptString, generateKey } from "./crypto";
+
+const testKey = "0123456789ABCDEF";
+const testData = "This is the test data.";
+const derivedTestKey = "1UPCi_Wvhl8EsfW2cERtOL9KB5RbZkmmIa5wMrLLz6E";
+
+describe("Encryption suite", () => {
+	it("should generate 256-bit keys", () => {
+		const key = generateKey(testData);
+		expect(key).toHaveLength(43);
+	});
+
+	it("should generate deterministic 256-bit keys from seed material", () => {
+		const key = generateKey(testData);
+		expect(key).toEqual(derivedTestKey);
+	});
+
+	it("should encrypt", () => {
+		const encryptedData = encryptString(testData, testKey);
+		expect(encryptedData).toHaveProperty("ciphertext");
+		expect(encryptedData).toHaveProperty("hmac");
+	});
+
+	it("should decrypt encrypted data with the correct key", () => {
+		const encryptedData = encryptString(testData, testKey);
+		const data = decryptString(encryptedData, testKey);
+		expect(data).toEqual(testData);
+	});
+
+	it("should fail decrypting with wrong key", () => {
+		const ciphertext = encryptString(testData, testKey);
+		const tempKey = generateKey("wrong key");
+		expect(() => {
+			decryptString(ciphertext, tempKey);
+		}).toThrowError(/Cannot decrypt ciphertext with this key./g);
+	});
+});

src/crypto.ts

@@ -0,0 +1,40 @@
+import { AES, PBKDF2, HmacSHA256, enc } from "crypto-js";
+
+interface EncryptedData {
+	ciphertext: string;
+	hmac: string;
+}
+
+/**
+ * Generates a 256-bit key from a
+ * Note: I don't add a salt because the key will be derived from a different
+ *       passphrase for every shared note anyways..
+ * @param seed passphrase-like data to generate the key from.
+ */
+export function generateKey(seed: string): string {
+	const salt = "";
+	const key256 = PBKDF2(seed, salt, { keySize: 256 / 32 });
+	return key256.toString(enc.Base64url);
+}
+
+export function encryptString(md: string, key: string): EncryptedData {
+	// Generate message authentication code
+	const msg = enc.Utf8.parse(md);
+	const ciphertext = AES.encrypt(msg, key).toString();
+	const hmac = HmacSHA256(ciphertext, key).toString();
+	return { ciphertext, hmac };
+}
+
+export function decryptString(
+	{ ciphertext, hmac }: EncryptedData,
+	key: string
+): string {
+	const hmac_calculated = HmacSHA256(ciphertext, key).toString();
+	const is_authentic = hmac_calculated == hmac;
+
+	if (!is_authentic) {
+		throw Error("Cannot decrypt ciphertext with this key.");
+	}
+	const md = AES.decrypt(ciphertext, key).toString(enc.Utf8);
+	return md;
+}

src/encryption.ts

@@ -0,0 +1,15 @@
+import { MarkdownView, moment } from "obsidian";
+import { generateKey, encryptString } from "./crypto";
+
+interface encryptedMarkdown {
+	ciphertext: string;
+	hmac: string;
+	key: string;
+}
+
+export function encryptMarkdown(mdView: MarkdownView): encryptedMarkdown {
+	const plaintext = mdView.getViewData();
+	const key = generateKey(moment.now() + plaintext);
+	const { ciphertext, hmac } = encryptString(plaintext, key);
+	return { ciphertext, hmac, key };
+}

styles.css

@@ -1,4 +0,0 @@
-/* Sets all the text color to red! */
-body {
-    color: red;
-}

vite.config.ts

@@ -0,0 +1,7 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+	test: {
+		// ...
+	},
+});