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class WebAuthnHandler {
static isWebAuthnSupported() {
return window.PublicKeyCredential;
}
static showErrorMessage(errorMessage) {
console.log("webauthn error: " + errorMessage);
let alertElement = document.getElementById("webauthn-error");
if (alertElement) {
alertElement.textContent += " (" + errorMessage + ")";
alertElement.classList.remove("hidden");
}
}
async isConditionalLoginSupported() {
return WebAuthnHandler.isWebAuthnSupported() &&
window.PublicKeyCredential.isConditionalMediationAvailable &&
window.PublicKeyCredential.isConditionalMediationAvailable();
}
async conditionalLogin(abortController) {
if (await this.isConditionalLoginSupported()) {
this.login("", abortController);
}
}
decodeBuffer(value) {
return Uint8Array.from(atob(value.replace(/-/g, "+").replace(/_/g, "/")), c => c.charCodeAt(0));
}
encodeBuffer(value) {
return btoa(String.fromCharCode.apply(null, new Uint8Array(value)))
.replace(/\+/g, "-")
.replace(/\//g, "_")
.replace(/=/g, "");
}
async post(urlKey, username, data) {
let url = document.body.dataset[urlKey];
if (username) {
url += "?username=" + username;
}
return fetch(url, {
method: "POST",
headers: {
"Content-Type": "application/json",
"X-Csrf-Token": getCsrfToken()
},
body: JSON.stringify(data),
});
}
async get(urlKey, username) {
let url = document.body.dataset[urlKey];
if (username) {
url += "?username=" + username;
}
return fetch(url);
}
async removeAllCredentials() {
try {
await this.post("webauthnDeleteAllUrl", null, {});
} catch (err) {
WebAuthnHandler.showErrorMessage(err);
return;
}
window.location.reload();
}
async register() {
let registerBeginResponse;
try {
registerBeginResponse = await this.get("webauthnRegisterBeginUrl");
} catch (err) {
WebAuthnHandler.showErrorMessage(err);
return;
}
let credentialCreationOptions = await registerBeginResponse.json();
credentialCreationOptions.publicKey.challenge = this.decodeBuffer(credentialCreationOptions.publicKey.challenge);
credentialCreationOptions.publicKey.user.id = this.decodeBuffer(credentialCreationOptions.publicKey.user.id);
if (Object.hasOwn(credentialCreationOptions.publicKey, 'excludeCredentials')) {
credentialCreationOptions.publicKey.excludeCredentials.forEach((credential) => credential.id = this.decodeBuffer(credential.id));
}
let attestation = await navigator.credentials.create(credentialCreationOptions);
let registrationFinishResponse;
try {
registrationFinishResponse = await this.post("webauthnRegisterFinishUrl", null, {
id: attestation.id,
rawId: this.encodeBuffer(attestation.rawId),
type: attestation.type,
response: {
attestationObject: this.encodeBuffer(attestation.response.attestationObject),
clientDataJSON: this.encodeBuffer(attestation.response.clientDataJSON),
},
});
} catch (err) {
WebAuthnHandler.showErrorMessage(err);
return;
}
if (!registrationFinishResponse.ok) {
throw new Error("Login failed with HTTP status code " + response.status);
}
let jsonData = await registrationFinishResponse.json();
window.location.href = jsonData.redirect;
}
async login(username, abortController) {
let loginBeginResponse;
try {
loginBeginResponse = await this.get("webauthnLoginBeginUrl", username);
} catch (err) {
WebAuthnHandler.showErrorMessage(err);
return;
}
let credentialRequestOptions = await loginBeginResponse.json();
credentialRequestOptions.publicKey.challenge = this.decodeBuffer(credentialRequestOptions.publicKey.challenge);
if (Object.hasOwn(credentialRequestOptions.publicKey, 'allowCredentials')) {
credentialRequestOptions.publicKey.allowCredentials.forEach((credential) => credential.id = this.decodeBuffer(credential.id));
}
if (abortController) {
credentialRequestOptions.signal = abortController.signal;
credentialRequestOptions.mediation = "conditional";
}
let assertion;
try {
assertion = await navigator.credentials.get(credentialRequestOptions);
}
catch (err) {
// Swallow aborted conditional logins
if (err instanceof DOMException && err.name == "AbortError") {
return;
}
WebAuthnHandler.showErrorMessage(err);
return;
}
if (!assertion) {
return;
}
let loginFinishResponse;
try {
loginFinishResponse = await this.post("webauthnLoginFinishUrl", username, {
id: assertion.id,
rawId: this.encodeBuffer(assertion.rawId),
type: assertion.type,
response: {
authenticatorData: this.encodeBuffer(assertion.response.authenticatorData),
clientDataJSON: this.encodeBuffer(assertion.response.clientDataJSON),
signature: this.encodeBuffer(assertion.response.signature),
userHandle: this.encodeBuffer(assertion.response.userHandle),
},
});
} catch (err) {
WebAuthnHandler.showErrorMessage(err);
return;
}
if (!loginFinishResponse.ok) {
throw new Error("Login failed with HTTP status code " + loginFinishResponse.status);
}
window.location.reload();
}
}
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