able to sign -- let's see what happens next

sw_scripts/safari-notifications.js

@@ -8,6 +8,337 @@ async function generateSHA256Hash(data) {
   return hashHex;
 }
 
+function bufferFromBase64(base64) {
+    const binaryString = atob(base64);
+    const length = binaryString.length;
+    const bytes = new Uint8Array(length);
+
+    for (let i = 0; i < length; i++) {
+        bytes[i] = binaryString.charCodeAt(i);
+    }
+
+    return bytes;
+}
+
+    function fromString(str, encoding = 'utf8') {
+        if (encoding === 'utf8') {
+            return new TextEncoder().encode(str);
+        } else if (encoding === 'base16') {
+            if (str.length % 2 !== 0) {
+                throw new Error('Invalid hex string length.');
+            }
+            let bytes = new Uint8Array(str.length / 2);
+            for (let i = 0; i < str.length; i += 2) {
+                bytes[i/2] = parseInt(str.substring(i, i + 2), 16);
+            }
+            return bytes;
+
+        } else if (encoding === 'base64url') {
+            str = str.replace(/-/g, '+').replace(/_/g, '/');
+            while (str.length % 4) {
+                str += '=';
+            }
+            return new Uint8Array(bufferFromBase64(str));
+        } else {
+            throw new Error(`Unsupported encoding "${encoding}"`);
+        }
+    }
+
+
+    /**
+     * Convert a Uint8Array to a string with the given encoding.
+     *
+     * @param {Uint8Array} byteArray - The Uint8Array to convert.
+     * @param {string} [encoding='utf8'] - The desired encoding ('utf8', 'base16', 'base64url').
+     * @returns {string} - The encoded string.
+     * @throws {Error} - Throws an error if the encoding is unsupported.
+     */
+    function toString(byteArray, encoding = 'utf8') {
+        switch (encoding) {
+        case 'utf8':
+            return decodeUTF8(byteArray);
+        case 'base16':
+            return toBase16(byteArray);
+        case 'base64url':
+            return toBase64Url(byteArray);
+        default:
+            throw new Error(`Unsupported encoding "${encoding}"`);
+        }
+    }
+
+    /**
+     * Decode a Uint8Array as a UTF-8 string.
+     *
+     * @param {Uint8Array} byteArray
+     * @returns {string}
+     */
+    function decodeUTF8(byteArray) {
+        return new TextDecoder().decode(byteArray);
+    }
+
+    /**
+     * Convert a Uint8Array to a base16 (hex) encoded string.
+     *
+     * @param {Uint8Array} byteArray
+     * @returns {string}
+     */
+    function toBase16(byteArray) {
+        return Array.from(byteArray).map(byte => byte.toString(16).padStart(2, '0')).join('');
+    }
+
+    /**
+     * Convert a Uint8Array to a base64url encoded string.
+     *
+     * @param {Uint8Array} byteArray
+     * @returns {string}
+     */
+    function toBase64Url(byteArray) {
+        let uint8Array = new Uint8Array(byteArray);
+        let binaryString = '';
+        for (let i = 0; i < uint8Array.length; i++) {
+            binaryString += String.fromCharCode(uint8Array[i]);
+        }
+
+        // Encode to base64
+        let base64 = btoa(binaryString);
+    
+        return base64.replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/, '');
+    }
+
+    const u8a = { toString, fromString };
+
+    function sha256(payload) {
+        const data = typeof payload === 'string' ? u8a.fromString(payload) : payload;
+        return generateSHA256Hash(data);
+    }
+
+
+    async function accessToken(identifier) {
+        const did = identifier['did'];
+        const privateKeyHex = identifier['keys'][0]['privateKeyHex'];
+
+        const signer = await SimpleSigner(privateKeyHex);
+
+        const nowEpoch = Math.floor(Date.now() / 1000);
+        const endEpoch = nowEpoch + 60; // add one minute
+
+        const tokenPayload = { exp: endEpoch, iat: nowEpoch, iss: did };
+        const alg = undefined; // defaults to 'ES256K', more standardized but harder to verify vs ES256K-R
+        const jwt = await createJWT(tokenPayload, {
+            alg,
+            issuer: did,
+            signer,
+        });
+        return jwt;
+    }
+
+
+    async function createJWT(payload, options, header = {}) {
+        const { issuer, signer, alg, expiresIn, canonicalize } = options;
+
+        if (!signer) throw new Error('missing_signer: No Signer functionality has been configured');
+        if (!issuer) throw new Error('missing_issuer: No issuing DID has been configured');
+        if (!header.typ) header.typ = 'JWT';
+        if (!header.alg) header.alg = alg;
+
+        const timestamps = {
+            iat: Math.floor(Date.now() / 1000),
+            exp: undefined,
+        };
+
+        if (expiresIn) {
+            if (typeof expiresIn === 'number') {
+                timestamps.exp = (payload.nbf || timestamps.iat) + Math.floor(expiresIn);
+            } else {
+                throw new Error('invalid_argument: JWT expiresIn is not a number');
+            }
+        }
+
+        const fullPayload = { ...timestamps, ...payload, iss: issuer };
+        return createJWS(fullPayload, signer, header, { canonicalize });
+    }
+
+
+    const defaultAlg = 'ES256K'
+
+
+    async function createJWS(payload, signer, header = {}, options = {}) {
+        if (!header.alg) header.alg = defaultAlg;
+        const encodedPayload = typeof payload === 'string' ? payload : encodeSection(payload, options.canonicalize);
+        const signingInput = [encodeSection(header, options.canonicalize), encodedPayload].join('.');
+
+        const jwtSigner = ES256KSignerAlg(false);
+        const signature = await jwtSigner(signingInput, signer);
+
+        // JWS Compact Serialization
+        // https://www.rfc-editor.org/rfc/rfc7515#section-7.1
+        return [signingInput, signature].join('.');
+    }
+
+    function canonicalizeData (object) {
+        if (typeof object === 'number' && isNaN(object)) {
+            throw new Error('NaN is not allowed');
+        }
+
+        if (typeof object === 'number' && !isFinite(object)) {
+            throw new Error('Infinity is not allowed');
+        }
+
+        if (object === null || typeof object !== 'object') {
+            return JSON.stringify(object);
+        }
+
+        if (object.toJSON instanceof Function) {
+            return serialize(object.toJSON());
+        }
+
+        if (Array.isArray(object)) {
+            const values = object.reduce((t, cv, ci) => {
+                const comma = ci === 0 ? '' : ',';
+                const value = cv === undefined || typeof cv === 'symbol' ? null : cv;
+                return `${t}${comma}${serialize(value)}`;
+            }, '');
+            return `[${values}]`;
+        }
+
+        const values = Object.keys(object).sort().reduce((t, cv) => {
+            if (object[cv] === undefined ||
+                typeof object[cv] === 'symbol') {
+                return t;
+            }
+            const comma = t.length === 0 ? '' : ',';
+            return `${t}${comma}${serialize(cv)}:${serialize(object[cv])}`;
+        }, '');
+        return `{${values}}`;
+    };
+
+    function encodeSection(data, shouldCanonicalize = false) {
+        if (shouldCanonicalize) {
+            return encodeBase64url(canonicalizeData(data));
+        } else {
+            return encodeBase64url(JSON.stringify(data));
+        }
+    }
+
+
+    function encodeBase64url(s) {
+        return bytesToBase64url(u8a.fromString(s))
+    }
+
+    function instanceOfEcdsaSignature(object) {
+        return typeof object === 'object' && 'r' in object && 's' in object;
+    }
+
+    function ES256KSignerAlg(recoverable) {
+        return async function sign(payload, signer) {
+            const signature = await signer(payload);
+            if (instanceOfEcdsaSignature(signature)) {
+                return toJose(signature, recoverable);
+            } else {
+                if (recoverable && typeof fromJose(signature).recoveryParam === 'undefined') {
+                    throw new Error(`not_supported: ES256K-R not supported when signer doesn't provide a recovery param`);
+                }
+                return signature;
+            }
+        };
+    }
+
+    function leftpad(data, size = 64) {
+        if (data.length === size) return data;
+        return '0'.repeat(size - data.length) + data;
+    }
+
+
+    async function SimpleSigner(hexPrivateKey) {
+        const signer = await ES256KSigner(hexToBytes(hexPrivateKey), true);
+        return async (data) => {
+            const signature = (await signer(data));
+            return fromJose(signature);
+        };
+    }
+
+
+    function hexToBytes(s, minLength) {
+        let input = s.startsWith('0x') ? s.substring(2) : s;
+
+        if (input.length % 2 !== 0) {
+            input = `0${input}`;
+        }
+
+        if (minLength) {
+            const paddedLength = Math.max(input.length, minLength * 2);
+            input = input.padStart(paddedLength, '00');
+        }
+
+        return u8a.fromString(input.toLowerCase(), 'base16');
+    }
+
+
+    function ES256KSigner(privateKey, recoverable = false) {
+        const privateKeyBytes = privateKey;
+        if (privateKeyBytes.length !== 32) {
+            throw new Error(`bad_key: Invalid private key format. Expecting 32 bytes, but got ${privateKeyBytes.length}`);
+        }
+
+        return async function(data) {
+	    const privateKey = Secp256k1.uint256(privateKeyBytes, 16);
+	    const hash = await sha256(data);
+	    const digest = Secp256k1.uint256(hash, 16);
+	    console.error(privateKey, digest);
+            const signature = Secp256k1.ecsign(privateKey, digest);
+	    const sigR = Secp256k1.uint256(signature.r,16);
+	    const sigS = Secp256k1.uint256(signature.s,16);
+            return toJose({
+                r: leftpad(signature.r.toString(16)),
+                s: leftpad(signature.s.toString(16)),
+                recoveryParam: signature.v,
+            }, recoverable);
+        }
+    }
+
+
+    function toJose(signature, recoverable) {
+        const { r, s, recoveryParam } = signature;
+        const jose = new Uint8Array(recoverable ? 65 : 64);
+        jose.set(u8a.fromString(r, 'base16'), 0);
+        jose.set(u8a.fromString(s, 'base16'), 32);
+
+        if (recoverable) {
+            if (typeof recoveryParam === 'undefined') {
+                throw new Error('Signer did not return a recoveryParam');
+            }
+            jose[64] = recoveryParam;
+        }
+        return bytesToBase64url(jose);
+    }
+
+
+    function bytesToBase64url(b) {
+        return u8a.toString(b, 'base64url');
+    }
+
+    function base64ToBytes(s) {
+        const inputBase64Url = s.replace(/\+/g, '-').replace(/\//g, '_').replace(/=/g, '')
+        return u8a.fromString(inputBase64Url, 'base64url')
+    }
+
+    function bytesToHex(b) {
+        return u8a.toString(b, 'base16')
+    }
+
+    function fromJose(signature) {
+        const signatureBytes = base64ToBytes(signature);
+        if (signatureBytes.length < 64 || signatureBytes.length > 65) {
+            throw new TypeError(`Wrong size for signature. Expected 64 or 65 bytes, but got ${signatureBytes.length}`,);
+        }
+        const r = bytesToHex(signatureBytes.slice(0, 32));
+        const s = bytesToHex(signatureBytes.slice(32, 64));
+        const recoveryParam = signatureBytes.length === 65 ? signatureBytes[64] : undefined;
+
+        return { r, s, recoveryParam };
+    }
+
+
 function validateBase64(s) {
   if (
     !/^(?:[A-Za-z0-9+\/]{2}[A-Za-z0-9+\/]{2})*(?:[A-Za-z0-9+\/]{2}==|[A-Za-z0-9+\/]{3}=)?$/.test(
@@ -107,6 +438,15 @@ async function getNotificationCount() {
         const decoder = new TextDecoder("utf-8");
         const decrypted = self.secretbox.open(message, nonce, secretUint8Array);
 
+        const msg = decoder.decode(decrypted);
+        const identifier = JSON.parse(JSON.parse(msg));
+
+        const headers = {
+            "Content-Type": "application/json",
+        };
+
+        headers["Authorization"] = "Bearer " + await accessToken(identifier);
+	  
         result = decrypted;
 
         break;