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234 changes: 234 additions & 0 deletions extensions/firebasedb.js
Original file line number Diff line number Diff line change
@@ -0,0 +1,234 @@
// Name: FirebaseDB
// ID: firebasedb
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ID should include your username in both header metadata and the getInfo ID

// Description: Extension for online, password-protected Firebase database storage.
// By: Logise <https://scratch.mit.edu/users/Logise/>
// Original: FirebaseDB
// License: MPL-2.0

(function (Scratch) {
"use strict";
if (!Scratch.extensions.unsandboxed)
throw new Error("FirebaseDB must run unsandboxed");
const icon =
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class FirebaseDB {
constructor() {
this.api =
"https://guessthepin-2fe64-default-rtdb.europe-west1.firebasedatabase.app";
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If this references an external domain, it likely won't be merged. Here's a few reasons:

  1. If the domain ever goes down, real projects don't work any more -- there's no guarantee of future compatibility
  2. Some users may be on a whitelisted network that blocks this anyway.

I'd recommend closing this PR and working with the already open #1341, which uses a browser API for a more compatible permanent storage solution.

}

getInfo() {
return {
id: "FirebaseDB",
name: "Firebase DB",
color1: "#fea631",
menuIconURI: icon,
blocks: [
{
blockType: Scratch.BlockType.LABEL,
text: "Made by @logise on Discord",
},
{
opcode: "setKey",
blockType: Scratch.BlockType.COMMAND,
text: "set key [KEY] to value [VALUE]",
arguments: {
KEY: { type: Scratch.ArgumentType.STRING, defaultValue: "key" },
VALUE: {
type: Scratch.ArgumentType.STRING,
defaultValue: "value",
},
},
},
{
opcode: "getKey",
blockType: Scratch.BlockType.REPORTER,
text: "get key [KEY]",
arguments: {
KEY: { type: Scratch.ArgumentType.STRING, defaultValue: "key" },
},
},
{ blockType: Scratch.BlockType.LABEL, text: "Password Blocks:" },
{
opcode: "setKeyWithPassword",
blockType: Scratch.BlockType.COMMAND,
text: "set key [KEY] to value [VALUE] with password [PASSWORD]",
arguments: {
KEY: { type: Scratch.ArgumentType.STRING, defaultValue: "key" },
VALUE: {
type: Scratch.ArgumentType.STRING,
defaultValue: "value",
},
PASSWORD: {
type: Scratch.ArgumentType.STRING,
defaultValue: "password",
},
},
},
{
opcode: "getKeyWithPassword",
blockType: Scratch.BlockType.REPORTER,
text: "get key [KEY] with password [PASSWORD]",
arguments: {
KEY: { type: Scratch.ArgumentType.STRING, defaultValue: "key" },
PASSWORD: {
type: Scratch.ArgumentType.STRING,
defaultValue: "password",
},
},
},
{
opcode: "checkPassword",
blockType: Scratch.BlockType.BOOLEAN,
text: "check if password [PASSWORD] is valid for key [KEY]",
arguments: {
PASSWORD: {
type: Scratch.ArgumentType.STRING,
defaultValue: "password",
},
KEY: { type: Scratch.ArgumentType.STRING, defaultValue: "key" },
},
},
],
};
}

async delay() {
const d = Math.random() * 500;
return new Promise((r) => setTimeout(r, d));
}

async setKey(args) {
await this.delay();
const { KEY, VALUE } = args;
if (VALUE.length > 8000) return;
await fetch(`${this.api}/pin/${encodeURIComponent(KEY)}.json`, {
method: "PUT",
body: JSON.stringify(VALUE),
});
}

async getKey(args) {
await this.delay();
const { KEY } = args;
const res = await fetch(
`${this.api}/pin/${encodeURIComponent(KEY)}.json`
);
const data = await res.json();
return data ?? "";
}

async deriveKey(password, salt) {
const enc = new TextEncoder();
const keyMaterial = await crypto.subtle.importKey(
"raw",
enc.encode(password),
"PBKDF2",
false,
["deriveKey"]
);
return await crypto.subtle.deriveKey(
{
name: "PBKDF2",
salt,
iterations: 100000,
hash: "SHA-256",
},
keyMaterial,
{ name: "AES-GCM", length: 256 },
false,
["encrypt", "decrypt"]
);
}

async setKeyWithPassword(args) {
await this.delay();
const { KEY, VALUE, PASSWORD } = args;
if (VALUE.length > 8000) return;

const enc = new TextEncoder();
const iv = crypto.getRandomValues(new Uint8Array(12));
const salt = crypto.getRandomValues(new Uint8Array(16));
const key = await this.deriveKey(PASSWORD, salt);
const encrypted = await crypto.subtle.encrypt(
{ name: "AES-GCM", iv },
key,
enc.encode(VALUE)
);

const fullPackage = {
iv: Array.from(iv),
salt: Array.from(salt),
data: Array.from(new Uint8Array(encrypted)),
};

await fetch(`${this.api}/cypher/${encodeURIComponent(KEY)}.json`, {
method: "PUT",
body: JSON.stringify(fullPackage),
});
}

async getKeyWithPassword(args) {
await this.delay();
const { KEY, PASSWORD } = args;

const res = await fetch(
`${this.api}/cypher/${encodeURIComponent(KEY)}.json`
);
const encryptedPackage = await res.json();
if (
!encryptedPackage ||
!encryptedPackage.data ||
!encryptedPackage.iv ||
!encryptedPackage.salt
)
return "";

try {
const iv = new Uint8Array(encryptedPackage.iv);
const salt = new Uint8Array(encryptedPackage.salt);
const data = new Uint8Array(encryptedPackage.data);
const key = await this.deriveKey(PASSWORD, salt);
const decrypted = await crypto.subtle.decrypt(
{ name: "AES-GCM", iv },
key,
data
);
return new TextDecoder().decode(decrypted);
} catch (e) {
return "";
}
}

async checkPassword(args) {
await this.delay();
const { KEY, PASSWORD } = args;

const res = await fetch(
`${this.api}/cypher/${encodeURIComponent(KEY)}.json`
);
const encryptedPackage = await res.json();
if (
!encryptedPackage ||
!encryptedPackage.data ||
!encryptedPackage.iv ||
!encryptedPackage.salt
)
return false;

try {
const iv = new Uint8Array(encryptedPackage.iv);
const salt = new Uint8Array(encryptedPackage.salt);
const data = new Uint8Array(encryptedPackage.data);
const key = await this.deriveKey(PASSWORD, salt);
await crypto.subtle.decrypt({ name: "AES-GCM", iv }, key, data);
return true;
} catch (e) {
return false;
}
}
}

Scratch.extensions.register(new FirebaseDB());
})(Scratch);