94c91f81-01e2-41ce-927e-502f1c8a6ec4

Committed 18 Feb 2026 03:57PM UTC coverage: 10.79% (+3.7%) from 7.093%

Build # 94c91f81-01e2-41ce-927e-502f1c8a6ec4

Build Type

push

circleci

Committed by

web-flow

Commit Message

Merge pull request #434 from inclusion-numerique/dev

Release

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88 of 171 new or added lines in 26 files covered. (51.46%)

797 existing lines in 85 files now uncovered.

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0.0

/apps/web/src/utils/encodeSerializableState.ts

import pako from 'pako'
import superjson from 'superjson'

/**
 * Utility functions to encode and decode form state for safe transmission via URL.
 *
 * This module provides two functions, `encodeSerializableState` and `decodeSerializableState`,
 * which are intended to be used for serializing form state to a compressed string
 * and deserializing it back to its original form. This is particularly useful for passing
 * non-sensitive form data through URLs, ensuring the data remains unreadable to users.
 *
 * Example use case:
 * - Encode form state into a compressed string and append it as a query parameter in a URL.
 * - Decode the compressed string from the URL to prefill the form with the original data.
 */

export type EncodedState<T> = string & { __encodedStateType: T }

/**
 * Converts a Uint8Array to a url safe Base64 string.
 */
const uint8ArrayToBase64 = (uint8Array: Uint8Array): string => {
  const binaryString = [...uint8Array]
    .map((byte) => String.fromCodePoint(byte))
    .join('')
  return btoa(binaryString)
    .replaceAll('+', '-') // Replace "+" with "-"
    .replaceAll('/', '_') // Replace "/" with "_"
    .replace(/=+$/, '') // Remove "=" padding
}

/**
 * Converts a url safe Base64 string back to a Uint8Array.
 */
const base64ToUint8Array = (base64String: string): Uint8Array => {
  const binaryString = atob(
    base64String
      .replaceAll('-', '+') // Replace "-" with "+"
      .replaceAll('_', '/'), // Replace "_" with "/"
  )
  return Uint8Array.from(binaryString, (char) => {
    const code = char.codePointAt(0)
    if (code === undefined) {
      throw new Error('Invalid character in Base64 string')
    }
    return code
  })
}

export const encodeSerializableState = <T>(state: T): EncodedState<T> => {
  const jsonString = superjson.stringify(state)
  const compressed = pako.deflate(jsonString)

  return uint8ArrayToBase64(compressed) as EncodedState<T> // Base64-URL-safe encoding
}

export const decodeSerializableState = <T>(
  encodedState: EncodedState<T>,
  defaultValue: T, // Needed if decoding fails
): T => {
  try {
    const compressed = base64ToUint8Array(encodedState) // Base64-URL-safe decoding
    const jsonString = pako.inflate(compressed, { to: 'string' })
    return superjson.parse<T>(jsonString)
  } catch {
    return defaultValue
  }
}

1	import pako from 'pako'
2	import superjson from 'superjson'
3
4	/**
5	* Utility functions to encode and decode form state for safe transmission via URL.
6	*
7	* This module provides two functions, `encodeSerializableState` and `decodeSerializableState`,
8	* which are intended to be used for serializing form state to a compressed string
9	* and deserializing it back to its original form. This is particularly useful for passing
10	* non-sensitive form data through URLs, ensuring the data remains unreadable to users.
11	*
12	* Example use case:
13	* - Encode form state into a compressed string and append it as a query parameter in a URL.
14	* - Decode the compressed string from the URL to prefill the form with the original data.
15	*/
16
17	export type EncodedState<T> = string & { __encodedStateType: T }
18
19	/**
20	* Converts a Uint8Array to a url safe Base64 string.
21	*/
UNCOV 22	const uint8ArrayToBase64 = (uint8Array: Uint8Array): string => {	×
UNCOV 23	const binaryString = [...uint8Array]	×
UNCOV 24	.map((byte) => String.fromCodePoint(byte))	×
25	.join('')
26	return btoa(binaryString)
27	.replaceAll('+', '-') // Replace "+" with "-"
28	.replaceAll('/', '_') // Replace "/" with "_"
29	.replace(/=+$/, '') // Remove "=" padding
30	}
31
32	/**
33	* Converts a url safe Base64 string back to a Uint8Array.
34	*/
UNCOV 35	const base64ToUint8Array = (base64String: string): Uint8Array => {	×
UNCOV 36	const binaryString = atob(	×
37	base64String
38	.replaceAll('-', '+') // Replace "-" with "+"
39	.replaceAll('_', '/'), // Replace "_" with "/"
40	)
UNCOV 41	return Uint8Array.from(binaryString, (char) => {	×
UNCOV 42	const code = char.codePointAt(0)	×
UNCOV 43	if (code === undefined) {	×
44	throw new Error('Invalid character in Base64 string')	×
45	}
UNCOV 46	return code	×
47	})
48	}
49
UNCOV 50	export const encodeSerializableState = <T>(state: T): EncodedState<T> => {	×
UNCOV 51	const jsonString = superjson.stringify(state)	×
UNCOV 52	const compressed = pako.deflate(jsonString)	×
53
UNCOV 54	return uint8ArrayToBase64(compressed) as EncodedState<T> // Base64-URL-safe encoding	×
55	}
56
UNCOV 57	export const decodeSerializableState = <T>(	×
58	encodedState: EncodedState<T>,
59	defaultValue: T, // Needed if decoding fails
60	): T => {
UNCOV 61	try {	×
UNCOV 62	const compressed = base64ToUint8Array(encodedState) // Base64-URL-safe decoding	×
UNCOV 63	const jsonString = pako.inflate(compressed, { to: 'string' })	×
UNCOV 64	return superjson.parse<T>(jsonString)	×
65	} catch {
UNCOV 66	return defaultValue	×
67	}
68	}

inclusion-numerique / coop-mediation-numerique / 94c91f81-01e2-41ce-927e-502f1c8a6ec4

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