object-observer

CDN provisioning

CDN provisioning is a general convenience feature, which also provides:

security:
- HTTPS only
- intergrity checksum provided, see below
performance
- highly available (with many geo spread edges)
- agressive caching setup

Usage

Import object-observer directly from CDN:

import { Observable } from 'https://libs.gullerya.com/object-observer/x.y.z/object-observer.min.js';

Note: regular and minified resouces are available.

Note: replace the x.y.z with the desired version, one of the listed in the changelog.

Integrity (SRI)

Security feature integrity was introduced specifically to fortify a consumption of a CDN delivered modules. object-observer adheres to this effort and provides integrity checksums per release (starting from version 4.2.4).

Usage example

To begin with, detailed description on SRI (Subresource Integrity) found here.

Since object-observer provides ES6 module syntax, the approach described in the documentation above and elsewhere is not applicable. In this case, and until a better way available (like this proposal of myself), one is required to use <link rel="modulepreload"> in addition to the regular import in order to enforce integrity validation.

Thus, please add the below HTML piece in your HTML, when willing to enforce the module’s integrity:

<link rel="modulepreload" 
  href="https://libs.gullerya.com/object-observer/x.y.z/object-observer.min.js"
  integrity="hash">

Note: version (to be put instead of x.y.z) and resource kind (regular/minified) should be the same as you use in the application. Accordingly, replace the hash with the relevant value as per version and resource, see below.

Note: modulepreload in general and integrity attribute with it in particular are still having a limited support.

Integrity checksums

Checksums provided per version for both, regular and minified resources.

From version 4.6.6 SRI hashes provided via Git and NPM, by sri.json file:

Git: check out version tag, then find sri.json file in the repo root
GitHub: visit the file via GitHub UI at version tag, eg this link (pay attention to the version tag in the URL)
NPM: do install object-observer via npm install..., then find sri.json file in your node_modules/object-observer folder

Below are SRI hashes of the pre-4.6.6 version:

Version	Resource	Integrity checksum (hash)

4.6.0	`object-observer.js`	`sha512-2SzwdAYs8e6Kh9qst3WsrQBHoALF0fqeHzFrbMwjjfPYvUJkpn0c0jBFs/rolSAtYCWK22h+Z3Ht6o5Wy80CyA==`
4.6.0	`object-observer.min.js`	`sha512-nxyrR/lamznRJA5CgXiTGdyyaXbfUaKa9bLYTcqLHlMG8rznT4j7VBewWGTsrjD5xFQxtn7VnlRhT/MF0hO3fA==`
4.5.0	`object-observer.js`	`sha512-PRxMMuoda0rmLHMFCguy2CSySHoWyCZtFIy+N7gzBHAOB9QYs0VGx8PbaHUhpyo0VwHDY/2L02bDZzmfAq3aIQ==`
4.5.0	`object-observer.min.js`	`sha512-Xn4niKWPRT5W502IEgfafP4W+agpLcE6Y/arwL2/kP5FQq1rFP5B6WRZiLPlT++qxGXHkKejduWo6L7SAVh0Sg==`
4.4.0	`object-observer.js`	`sha512-4l0Q/VlM/3dyYEiH6zp4qQ7oFoe6lcyKFDTU+wJ04LwK9o9hzvBYfmHzFlt4kicfGe4U8u+D+AD3onTQuQBoaw==`
4.4.0	`object-observer.min.js`	`sha512-zlqhnAOtENZ58r5GzmpbvYQMr9JrII7YrxJ9SEWQXNIZUhL/rZDTm3g0uH1895kbPKv/zIK59XcfrmAWtR/QDA==`
4.3.2	`object-observer.js`	`sha512-KIVmA1D/MQMPfJ2DunNeugVrTsOjt/q9BU2+C2E4PEMT+Om5kRE8nl/at+zBKbO7yUih/T9VmiQw50mROPfI/A==`
4.3.2	`object-observer.min.js`	`sha512-lpc5mmJKkVVMt5Cus2qHKN+9WppzIEqyBuT1ROmI2w+dC+RRwi0jB9p0El55Yoh2m5cmDOcXbv3YMyWQd22oZA==`
4.3.1	`object-observer.js`	`sha512-KIVmA1D/MQMPfJ2DunNeugVrTsOjt/q9BU2+C2E4PEMT+Om5kRE8nl/at+zBKbO7yUih/T9VmiQw50mROPfI/A==`
4.3.1	`object-observer.min.js`	`sha512-lpc5mmJKkVVMt5Cus2qHKN+9WppzIEqyBuT1ROmI2w+dC+RRwi0jB9p0El55Yoh2m5cmDOcXbv3YMyWQd22oZA==`
4.3.0	`object-observer.js`	`sha512-KIVmA1D/MQMPfJ2DunNeugVrTsOjt/q9BU2+C2E4PEMT+Om5kRE8nl/at+zBKbO7yUih/T9VmiQw50mROPfI/A==`
4.3.0	`object-observer.min.js`	`sha512-lpc5mmJKkVVMt5Cus2qHKN+9WppzIEqyBuT1ROmI2w+dC+RRwi0jB9p0El55Yoh2m5cmDOcXbv3YMyWQd22oZA==`
4.2.4	`object-observer.js`	`sha512-hS94aprLMMSBEKeIeXwdsSNjNjsaxaUjdUH029d5fga93buCNxXMcgusb5ELGUhbzi2qkjfQT8s/6m2PnwvCsQ==`
4.2.4	`object-observer.min.js`	`sha512-o98LgLvzBtc6j+XkCtt0K3JS9FxYwkDdEWduD1yX8gqRtte1Eg5E8iTfoKzLC+fcB2fYrmzrQM3G2mLm8Z1nOQ==`

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