Common objects and utilities shared across the Kansa server & modules
Last updated 2 years ago by eemeli .
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Common objects and utilities shared across the Kansa server & modules.

User authentication

const { isSignedIn, hasRole, matchesId } = require('@kansa/common/auth-user')

function isSignedIn(req, res, next)

Express.js middleware function that verifies that the current user is signed in. On failure, calls next(new AuthError()).

function hasRole(role: string | string[]): function(req, res, next)

Function returning an Express.js middleware function that verifies that the current user is signed in and has the specified role (or one of the roles, if an array). On failure, calls next(new AuthError()).

function matchesId(db, req, role?: string | string[]): Promise<number>

Verifies that the id parameter of the request req grants access to the session user's email. If set, role may define one or multiple roles that the user may have that grant access without a matching email.

db should be a pg-promise instance, or e.g. a task extended from such an instance. Returns a promise that either resolves to the id value, or rejects with either AuthError, InputError, or a database error.

new AuthError(message: string)


const config = require('@kansa/common/config')

The server configuration, sourced from config/kansa.yaml and read during server start.


const { AuthError, InputError } = require('@kansa/common/errors')

new AuthError(message: string)

new InputError(message: string)

Handled by the server's error handling. May also have their status set.

Log entries

const LogEntry = require('@kansa/common/log-entry')
new LogEntry(req, 'Log message').write(db)

new LogEntry(req, message: string)

Creates a new log entry for tracking changes. The entry's fields such as author, description and subject are modifiable before the entry gets stored with its write(db): Promise method.


function sendMail(type: string, data: any, delay?: number): Promise

Schedule an email message of type with data to be sent, with an optional delay in minutes. The message should have a correspondingly named template available under config/message-templates/.

function updateMailRecipient(db, email: string): Promise

Using the pg-promise instance db, fetch the appropriate data for email and forward it to be sent to Sendgrid. Returns a promise that will never reject.

Split names

const splitName = require('@kansa/common/split-name')

splitName('Bob Tucker')
// ['', 'Bob Tucker']

splitName('Bob Tucker', 8)
// ['Bob', 'Tucker']

splitName('Arthur Wilson "Bob" Tucker')
// [ 'Arthur Wilson', '"Bob" Tucker' ]

function splitName(name: string, maxLength = 14): [string, string]

Splits a name (or other string) prettily on two lines.

If the name already includes newlines, the first will be used to split the string and the others replaced with spaces. If the name is at most maxLength characters, it'll be returned as ['', name]. Otherwise, we find the most balanced white space to use as a split point.


const isTrueish = require('@kansa/common/trueish')

isTrueish() // false
isTrueish('0') // false
isTrueish(' False') // false
isTrueish(-1) // true

function isTrueish(v: any): boolean

Casts input into boolean values. In addition to normal JavaScript casting rules, also trims and lower-cases strings before comparing them to the following: '', '0', 'false', 'null'. Matches to these result in a false value. The primary intent is to enable human-friendly handling of query parameter values.

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