Module: BetterAuth::Plugins

Defined in:
lib/better_auth/plugins/passkey.rb

Constant Summary collapse

PASSKEY_ERROR_CODES = 
{
  "CHALLENGE_NOT_FOUND" => "Challenge not found",
  "YOU_ARE_NOT_ALLOWED_TO_REGISTER_THIS_PASSKEY" => "You are not allowed to register this passkey",
  "FAILED_TO_VERIFY_REGISTRATION" => "Failed to verify registration",
  "PASSKEY_NOT_FOUND" => "Passkey not found",
  "AUTHENTICATION_FAILED" => "Authentication failed",
  "UNABLE_TO_CREATE_SESSION" => "Unable to create session",
  "FAILED_TO_UPDATE_PASSKEY" => "Failed to update passkey",
  "PREVIOUSLY_REGISTERED" => "Previously registered",
  "REGISTRATION_CANCELLED" => "Registration cancelled",
  "AUTH_CANCELLED" => "Auth cancelled",
  "UNKNOWN_ERROR" => "Unknown error",
  "SESSION_REQUIRED" => "Passkey registration requires an authenticated session",
  "RESOLVE_USER_REQUIRED" => "Passkey registration requires either an authenticated session or a resolveUser callback when requireSession is false",
  "RESOLVED_USER_INVALID" => "Resolved user is invalid"
}.freeze
PASSKEY_CHALLENGE_MAX_AGE = 
60 * 5

Class Method Summary collapse

Class Method Details

.delete_passkey_endpoint ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 212

def delete_passkey_endpoint
  Endpoint.new(path: "/passkey/delete-passkey", method: "POST") do |ctx|
    session = Routes.current_session(ctx)
    body = normalize_hash(ctx.body)
    passkey = ctx.context.adapter.find_one(model: "passkey", where: [{field: "id", value: body[:id]}])
    raise APIError.new("NOT_FOUND", message: PASSKEY_ERROR_CODES.fetch("PASSKEY_NOT_FOUND")) unless passkey
    raise APIError.new("UNAUTHORIZED") unless passkey.fetch("userId") == session.fetch(:user).fetch("id")

    ctx.context.adapter.delete(model: "passkey", where: [{field: "id", value: passkey.fetch("id")}])
    ctx.json({status: true})
  end
end

.generate_passkey_authentication_options_endpoint(config) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 87

def generate_passkey_authentication_options_endpoint(config)
  Endpoint.new(path: "/passkey/generate-authenticate-options", method: "GET") do |ctx|
    session = Routes.current_session(ctx, allow_nil: true)
    passkey_configure_webauthn(config, ctx)
    passkeys = if session
      ctx.context.adapter.find_many(model: "passkey", where: [{field: "userId", value: session.fetch(:user).fetch("id")}])
    else
      []
    end
    options = WebAuthn::Credential.options_for_get(
      allow: passkeys.map { |passkey| passkey_credential_id(passkey) },
      extensions: passkey_resolve_extensions(config.dig(:authentication, :extensions), ctx)
    )
    passkey_store_challenge(ctx, config, options.challenge, session ? session.fetch(:user).fetch("id") : "")
    payload = options.as_json.merge(userVerification: "preferred")
    payload[:allowCredentials] = passkeys.map { |passkey| passkey_credential_descriptor(passkey) } if passkeys.any?
    ctx.json(payload)
  end
end

.generate_passkey_registration_options_endpoint(config) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 62

def generate_passkey_registration_options_endpoint(config)
  Endpoint.new(path: "/passkey/generate-register-options", method: "GET") do |ctx|
    query = normalize_hash(ctx.query)
    user = passkey_resolve_registration_user(config, ctx, query)
    passkey_configure_webauthn(config, ctx)
    existing = ctx.context.adapter.find_many(model: "passkey", where: [{field: "userId", value: user.fetch("id")}])
    options = WebAuthn::Credential.options_for_create(
      user: {
        id: Crypto.random_string(32).downcase,
        name: query[:name].to_s.empty? ? (user["email"] || user["name"] || user["id"]) : query[:name].to_s,
        display_name: user["displayName"] || user["display_name"] || user["email"] || user["name"] || user["id"]
      },
      exclude: existing.map { |passkey| passkey_credential_id(passkey) },
      authenticator_selection: passkey_authenticator_selection(config, query),
      extensions: passkey_resolve_extensions(config.dig(:registration, :extensions), ctx)
    )
    passkey_store_challenge(ctx, config, options.challenge, {
      id: user.fetch("id"),
      name: user["name"] || user["email"] || user["id"],
      displayName: user["displayName"] || user["display_name"]
    }.compact)
    ctx.json(options.as_json.merge(excludeCredentials: existing.map { |passkey| passkey_credential_descriptor(passkey) }))
  end
end

.list_passkeys_endpoint ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 204

def list_passkeys_endpoint
  Endpoint.new(path: "/passkey/list-user-passkeys", method: "GET") do |ctx|
    session = Routes.current_session(ctx)
    passkeys = ctx.context.adapter.find_many(model: "passkey", where: [{field: "userId", value: session.fetch(:user).fetch("id")}])
    ctx.json(passkeys.map { |passkey| passkey_wire(passkey) })
  end
end

.passkey(options = {}) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 34

def passkey(options = {})
  config = {
    origin: nil,
    advanced: {
      web_authn_challenge_cookie: "better-auth-passkey"
    }
  }.merge(normalize_hash(options))
  config[:advanced] = {
    web_authn_challenge_cookie: "better-auth-passkey"
  }.merge(config[:advanced] || {})

  Plugin.new(
    id: "passkey",
    schema: passkey_schema(config[:schema]),
    endpoints: {
      generate_passkey_registration_options: generate_passkey_registration_options_endpoint(config),
      generate_passkey_authentication_options: generate_passkey_authentication_options_endpoint(config),
      verify_passkey_registration: verify_passkey_registration_endpoint(config),
      verify_passkey_authentication: verify_passkey_authentication_endpoint(config),
      list_passkeys: list_passkeys_endpoint,
      delete_passkey: delete_passkey_endpoint,
      update_passkey: update_passkey_endpoint
    },
    error_codes: PASSKEY_ERROR_CODES,
    options: config
  )
end

.passkey_after_registration_verification_user_id(config, ctx, credential, challenge, response, session) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 394

def passkey_after_registration_verification_user_id(config, ctx, credential, challenge, response, session)
  user_data = challenge.fetch("userData")
  target_user_id = user_data.fetch("id")
  callback = config.dig(:registration, :after_verification)
  return target_user_id unless callback.respond_to?(:call)

  result = normalize_hash(passkey_call_callback(callback, {
    ctx: ctx,
    verification: credential,
    user: {
      id: user_data.fetch("id"),
      name: user_data["name"] || user_data.fetch("id"),
      display_name: user_data["displayName"] || user_data["display_name"]
    },
    client_data: response,
    context: challenge["context"]
  }) || {})
  returned_user_id = result[:user_id]
  return target_user_id if returned_user_id.to_s.empty?

  unless returned_user_id.is_a?(String)
    raise APIError.new("BAD_REQUEST", message: PASSKEY_ERROR_CODES.fetch("RESOLVED_USER_INVALID"))
  end

  if session && returned_user_id != session.fetch(:user).fetch("id")
    raise APIError.new("UNAUTHORIZED", message: PASSKEY_ERROR_CODES.fetch("YOU_ARE_NOT_ALLOWED_TO_REGISTER_THIS_PASSKEY"))
  end

  returned_user_id
end

.passkey_allowed_origins(config, ctx, origin: nil) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 314

def passkey_allowed_origins(config, ctx, origin: nil)
  Array(origin || config[:origin] || ctx.context.options.base_url).compact
end

.passkey_attestation_response(credential) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 457

def passkey_attestation_response(credential)
  credential.instance_variable_get(:@response)
end

.passkey_authenticator_data(credential) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 461

def passkey_authenticator_data(credential)
  passkey_attestation_response(credential)&.authenticator_data
end

.passkey_authenticator_selection(config, query) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 326

def passkey_authenticator_selection(config, query)
  selection = normalize_hash(config[:authenticator_selection] || {})
  attachment = query[:authenticator_attachment]
  selection[:authenticator_attachment] = attachment if attachment
  {
    resident_key: selection[:resident_key] || "preferred",
    user_verification: selection[:user_verification] || "preferred",
    authenticator_attachment: selection[:authenticator_attachment]
  }.compact
end

.passkey_call_callback(callback, data) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 425

def passkey_call_callback(callback, data)
  return nil unless callback.respond_to?(:call)

  if callback.parameters.any? { |kind, _name| [:key, :keyreq, :keyrest].include?(kind) }
    callback.call(**data)
  else
    callback.call(data)
  end
end

.passkey_challenge_cookie(ctx, config) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 300

def passkey_challenge_cookie(ctx, config)
  ctx.context.create_auth_cookie(config.dig(:advanced, :web_authn_challenge_cookie), max_age: PASSKEY_CHALLENGE_MAX_AGE)
end

.passkey_challenge_token(ctx, config) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 296

def passkey_challenge_token(ctx, config)
  ctx.get_signed_cookie(passkey_challenge_cookie(ctx, config).name, ctx.context.secret)
end

.passkey_configure_webauthn(config, ctx, origin: nil) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 304

def passkey_configure_webauthn(config, ctx, origin: nil)
  WebAuthn.configuration.rp_id = passkey_rp_id(config, ctx)
  WebAuthn.configuration.rp_name = config[:rp_name] || ctx.context.app_name
  WebAuthn.configuration.allowed_origins = passkey_allowed_origins(config, ctx, origin: origin)
end

.passkey_credential_descriptor(record) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 477

def passkey_credential_descriptor(record)
  descriptor = {
    id: passkey_credential_id(record),
    type: "public-key"
  }
  transports = (record["transports"] || record[:transports]).to_s.split(",").map(&:strip).reject(&:empty?)
  descriptor[:transports] = transports if transports.any?
  descriptor
end

.passkey_credential_id(record) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 473

def passkey_credential_id(record)
  record["credentialID"] || record["credentialId"] || record[:credentialID] || record[:credential_id]
end

.passkey_find_challenge(ctx, verification_token) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 287

def passkey_find_challenge(ctx, verification_token)
  verification = ctx.context.internal_adapter.find_verification_value(verification_token)
  return nil unless verification && !Routes.expired_time?(verification["expiresAt"])

  JSON.parse(verification.fetch("value"))
rescue JSON::ParserError
  nil
end

.passkey_origin(config, ctx) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 310

def passkey_origin(config, ctx)
  config[:origin] || ctx.headers["origin"]
end

.passkey_registration_user_data(id:, name:, display_name: nil, email: nil) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 379

def passkey_registration_user_data(id:, name:, display_name: nil, email: nil)
  {
    "id" => id,
    "name" => name,
    "displayName" => display_name,
    "email" => email
  }.compact
end

.passkey_resolve_extensions(extensions, ctx) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 388

def passkey_resolve_extensions(extensions, ctx)
  return nil unless extensions

  normalize_hash(extensions.respond_to?(:call) ? passkey_call_callback(extensions, {ctx: ctx}) : extensions)
end

.passkey_resolve_registration_user(config, ctx, query) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 337

def passkey_resolve_registration_user(config, ctx, query)
  require_session = config.dig(:registration, :require_session) != false
  if require_session
    session = Routes.current_session(ctx, sensitive: true)
    user = session.fetch(:user)
    return passkey_registration_user_data(
      id: user.fetch("id"),
      name: user["email"] || user["id"],
      display_name: user["email"] || user["id"],
      email: user["email"]
    )
  end

  session = Routes.current_session(ctx, allow_nil: true)
  if session
    user = session.fetch(:user)
    return passkey_registration_user_data(
      id: user.fetch("id"),
      name: user["email"] || user["id"],
      display_name: user["email"] || user["id"],
      email: user["email"]
    )
  end

  resolver = config.dig(:registration, :resolve_user)
  unless resolver.respond_to?(:call)
    raise APIError.new("BAD_REQUEST", message: PASSKEY_ERROR_CODES.fetch("RESOLVE_USER_REQUIRED"))
  end

  resolved = normalize_hash(passkey_call_callback(resolver, {ctx: ctx, context: query[:context]}) || {})
  unless resolved[:id].to_s != "" && resolved[:name].to_s != ""
    raise APIError.new("BAD_REQUEST", message: PASSKEY_ERROR_CODES.fetch("RESOLVED_USER_INVALID"))
  end

  passkey_registration_user_data(
    id: resolved[:id],
    name: resolved[:name],
    display_name: resolved[:display_name],
    email: resolved[:email]
  )
end

.passkey_rp_id(config, ctx) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 318

def passkey_rp_id(config, ctx)
  return config[:rp_id] if config[:rp_id]

  URI.parse(ctx.context.options.base_url.to_s).host || "localhost"
rescue URI::InvalidURIError
  "localhost"
end

.passkey_schema(custom_schema = nil) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 246

def passkey_schema(custom_schema = nil)
  base = {
    passkey: {
      model_name: "passkeys",
      fields: {
        name: {type: "string", required: false},
        publicKey: {type: "string", required: true},
        userId: {type: "string", references: {model: "user", field: "id"}, required: true, index: true},
        credentialID: {type: "string", required: true, index: true},
        counter: {type: "number", required: true},
        deviceType: {type: "string", required: true},
        backedUp: {type: "boolean", required: true},
        transports: {type: "string", required: false},
        createdAt: {type: "date", required: false},
        aaguid: {type: "string", required: false}
      }
    }
  }
  return base unless custom_schema.is_a?(Hash)

  base.merge(custom_schema) do |_key, old_value, new_value|
    (old_value.is_a?(Hash) && new_value.is_a?(Hash)) ? old_value.merge(new_value) : new_value
  end
end

.passkey_store_challenge(ctx, config, challenge, user_id) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 271

def passkey_store_challenge(ctx, config, challenge, user_id)
  user_data = user_id.is_a?(Hash) ? user_id : {id: user_id}
  verification_token = Crypto.random_string(32)
  cookie = passkey_challenge_cookie(ctx, config)
  ctx.set_signed_cookie(cookie.name, verification_token, ctx.context.secret, cookie.attributes.merge(max_age: PASSKEY_CHALLENGE_MAX_AGE))
  ctx.context.internal_adapter.create_verification_value(
    identifier: verification_token,
    value: JSON.generate({
      expectedChallenge: challenge,
      userData: user_data,
      context: normalize_hash(ctx.query)[:context]
    }),
    expiresAt: Time.now + PASSKEY_CHALLENGE_MAX_AGE
  )
end

.passkey_webauthn_response(value) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 435

def passkey_webauthn_response(value)
  data = normalize_hash(value || {})
  response = normalize_hash(data[:response] || {})
  webauthn = {
    "type" => data[:type],
    "id" => data[:id],
    "rawId" => data[:raw_id],
    "authenticatorAttachment" => data[:authenticator_attachment],
    "clientExtensionResults" => data[:client_extension_results] || {},
    "response" => {
      "attestationObject" => response[:attestation_object],
      "clientDataJSON" => response[:client_data_json],
      "transports" => response[:transports],
      "authenticatorData" => response[:authenticator_data],
      "signature" => response[:signature],
      "userHandle" => response[:user_handle]
    }.compact
  }.compact
  webauthn["rawId"] ||= webauthn["id"]
  webauthn
end

.passkey_wire(record) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 465

def passkey_wire(record)
  return record unless record.is_a?(Hash)

  output = record.dup
  output["credentialID"] = output.delete("credentialId") if output.key?("credentialId")
  output
end

.update_passkey_endpoint ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 225

def update_passkey_endpoint
  Endpoint.new(path: "/passkey/update-passkey", method: "POST") do |ctx|
    session = Routes.current_session(ctx)
    body = normalize_hash(ctx.body)
    passkey = ctx.context.adapter.find_one(model: "passkey", where: [{field: "id", value: body[:id]}])
    raise APIError.new("NOT_FOUND", message: PASSKEY_ERROR_CODES.fetch("PASSKEY_NOT_FOUND")) unless passkey
    if passkey.fetch("userId") != session.fetch(:user).fetch("id")
      raise APIError.new("UNAUTHORIZED", message: PASSKEY_ERROR_CODES.fetch("YOU_ARE_NOT_ALLOWED_TO_REGISTER_THIS_PASSKEY"))
    end

    updated = ctx.context.adapter.update(
      model: "passkey",
      where: [{field: "id", value: body[:id]}],
      update: {name: body[:name].to_s}
    )
    raise APIError.new("INTERNAL_SERVER_ERROR", message: PASSKEY_ERROR_CODES.fetch("FAILED_TO_UPDATE_PASSKEY")) unless updated

    ctx.json({passkey: passkey_wire(updated)})
  end
end

.verify_passkey_authentication_endpoint(config) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 155

def verify_passkey_authentication_endpoint(config)
  Endpoint.new(path: "/passkey/verify-authentication", method: "POST") do |ctx|
    origin = passkey_origin(config, ctx)
    raise APIError.new("BAD_REQUEST", message: "origin missing") if origin.to_s.empty?

    verification_token = passkey_challenge_token(ctx, config)
    raise APIError.new("BAD_REQUEST", message: PASSKEY_ERROR_CODES.fetch("CHALLENGE_NOT_FOUND")) unless verification_token

    challenge = passkey_find_challenge(ctx, verification_token)
    raise APIError.new("BAD_REQUEST", message: PASSKEY_ERROR_CODES.fetch("CHALLENGE_NOT_FOUND")) unless challenge

    response = passkey_webauthn_response(normalize_hash(ctx.body)[:response])
    credential_id = response.fetch("id")
    passkey = ctx.context.adapter.find_one(model: "passkey", where: [{field: "credentialID", value: credential_id}])
    raise APIError.new("UNAUTHORIZED", message: PASSKEY_ERROR_CODES.fetch("PASSKEY_NOT_FOUND")) unless passkey

    passkey_configure_webauthn(config, ctx, origin: origin)
    credential = WebAuthn::Credential.from_get(response)
    credential.verify(
      challenge.fetch("expectedChallenge"),
      public_key: Base64.strict_decode64(passkey.fetch("publicKey")),
      sign_count: passkey.fetch("counter").to_i,
      user_verification: false
    )
    passkey_call_callback(config.dig(:authentication, :after_verification), {
      ctx: ctx,
      verification: credential,
      client_data: response
    })
    ctx.context.adapter.update(
      model: "passkey",
      where: [{field: "id", value: passkey.fetch("id")}],
      update: {counter: credential.sign_count}
    )
    session = ctx.context.internal_adapter.create_session(passkey.fetch("userId"))
    raise APIError.new("INTERNAL_SERVER_ERROR", message: PASSKEY_ERROR_CODES.fetch("UNABLE_TO_CREATE_SESSION")) unless session

    user = ctx.context.internal_adapter.find_user_by_id(passkey.fetch("userId"))
    raise APIError.new("INTERNAL_SERVER_ERROR", message: "User not found") unless user

    Cookies.set_session_cookie(ctx, {session: session, user: user})
    ctx.context.internal_adapter.delete_verification_by_identifier(verification_token)
    ctx.json({session: session, user: user})
  rescue WebAuthn::Error, ArgumentError => error
    ctx.context.logger&.error("Failed to verify authentication", error)
    raise APIError.new("BAD_REQUEST", message: PASSKEY_ERROR_CODES.fetch("AUTHENTICATION_FAILED"))
  end
end

.verify_passkey_registration_endpoint(config) ⇒ Object 



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# File 'lib/better_auth/plugins/passkey.rb', line 107

def verify_passkey_registration_endpoint(config)
  Endpoint.new(path: "/passkey/verify-registration", method: "POST") do |ctx|
    require_session = config.dig(:registration, :require_session) != false
    session = require_session ? Routes.current_session(ctx, sensitive: true) : Routes.current_session(ctx, allow_nil: true, sensitive: true)
    origin = passkey_origin(config, ctx)
    raise APIError.new("BAD_REQUEST", message: "origin missing") if origin.to_s.empty?

    verification_token = passkey_challenge_token(ctx, config)
    raise APIError.new("BAD_REQUEST", message: PASSKEY_ERROR_CODES.fetch("CHALLENGE_NOT_FOUND")) unless verification_token

    challenge = passkey_find_challenge(ctx, verification_token)
    unless challenge
      raise APIError.new("BAD_REQUEST", message: PASSKEY_ERROR_CODES.fetch("CHALLENGE_NOT_FOUND"))
    end
    if session && challenge.fetch("userData").fetch("id") != session.fetch(:user).fetch("id")
      raise APIError.new("UNAUTHORIZED", message: PASSKEY_ERROR_CODES.fetch("YOU_ARE_NOT_ALLOWED_TO_REGISTER_THIS_PASSKEY"))
    end

    response = passkey_webauthn_response(normalize_hash(ctx.body)[:response])
    passkey_configure_webauthn(config, ctx, origin: origin)
    credential = WebAuthn::Credential.from_create(response)
    credential.verify(challenge.fetch("expectedChallenge"), user_verification: false)
    authenticator_data = passkey_authenticator_data(credential)
    body = normalize_hash(ctx.body)
    target_user_id = passkey_after_registration_verification_user_id(config, ctx, credential, challenge, response, session)
    data = ctx.context.adapter.create(
      model: "passkey",
      data: {
        name: body[:name],
        userId: target_user_id,
        credentialID: credential.id,
        publicKey: Base64.strict_encode64(credential.public_key),
        counter: credential.sign_count,
        deviceType: authenticator_data&.credential_backup_eligible? ? "multiDevice" : "singleDevice",
        backedUp: authenticator_data&.credential_backed_up? || false,
        transports: Array(passkey_attestation_response(credential)&.transports).join(","),
        createdAt: Time.now,
        aaguid: passkey_attestation_response(credential)&.aaguid
      }
    )
    ctx.context.internal_adapter.delete_verification_by_identifier(verification_token)
    ctx.json(passkey_wire(data))
  rescue WebAuthn::Error => error
    ctx.context.logger&.error("Failed to verify registration", error)
    raise APIError.new("INTERNAL_SERVER_ERROR", message: PASSKEY_ERROR_CODES.fetch("FAILED_TO_VERIFY_REGISTRATION"))
  end
end