https://www.reussir.fr/bio/modules/custom/reussir_smart_ad_server/js/consent-string.js?v=2.x

1class ConsentCoder{
2  binConvert(x, pad) {
3    if (isNaN(parseFloat(x))) { return; }
4    x = x.toString(2);
5    while (x.length < pad) {
6      x = "0" + x;
7    }
8    return x;
9  }
10
11  getConsentString(opted_categories){
12    //https://medium.com/@mark.burger/creating-iabs-gdpr-consent-strings-8c55b705878f
13    var consent_payload = "";
14
15    // VERSION
16    consent_payload += this.binConvert(1, 6);
17
18    // CREATED/CHANGED TIMESTAMPS
19    var q = Math.round((new Date()).getTime() / 100);
20    var ts = this.binConvert(q, 36);
21    consent_payload += ts + ts;
22
23    // CMP ID
24    consent_payload += this.binConvert(1, 12);
25
26    //CMP VERSION
27    consent_payload += this.binConvert(1, 12);
28
29    // CMP SCREEN
30    consent_payload += this.binConvert(1, 6);
31
32    // LANGUAGE CODE : FR (F:6 R:18)
33    consent_payload += this.binConvert(5, 6);
34    consent_payload += this.binConvert(17, 6);
35
36    // VENDOR LIST VERSION
37    consent_payload += this.binConvert(141, 12);
38
39    // // VENDOR LIST TCF POLICY VERSION
40    // consent_payload += this.binConvert(2, 6);
41
42    // // IS SERVICE SPECIFIC
43    // consent_payload += this.binConvert(1, 1);
44
45    // // USE NON STANDARDS STACKS
46    // consent_payload += this.binConvert(0, 1);
47
48    // // SPECIAL FEATURES OPT-IN
49    // consent_payload += "111111111111";
50
51    // FEATURES OPT-IN | PURPOSES ALLOWED
52    consent_payload += opted_categories;
53
54    // // PURPOSE LEGITIMATE INTEREST TRANSPARENCY
55    // consent_payload += "111111111111111111111111";
56
57    // //PURPOSE ONE TREATMENT
58    // consent_payload += "0";
59
60    // //PUBLISHER CC
61    // consent_payload += this.binConvert(5, 6);
62    // consent_payload += this.binConvert(17, 6);
63
64    // MAXIMUM VENDOR ID
65    consent_payload += this.binConvert(615, 16);
66
67    // PARTNER LIST ENCODING TYPE
68    consent_payload += "1"; // RANGE
69
70    // PARTNER LIST DEFAULT CONSENT
71    consent_payload += "1"; // CONSENT
72
73    // EXCEPTIONS LIST LENGTH
74    consent_payload += this.binConvert(0, 12);
75
76    // // NUMBER OF PUBLISHER RESTRICTIONS
77    // consent_payload += this.binConvert(0, 12);
78
79    // COMPLETE PAYLOAD
80    while (consent_payload.length % 8 != 0) { consent_payload += "0"; }
81
82    // TO BIN
83    var binary_payload = [];
84    for (var i = 0; i < consent_payload.length; i += 8) {
85      binary_payload.push(parseInt(consent_payload.substring(i, i + 8), 2));
86    }
87
88    // TO BASE64
89    var consent = btoa(String.fromCharCode(...binary_payload))
90      .replace(/\+/g, '-')
91      .replace(/\//g, '_')
92      .replace(/=+$/, '');
93
94    return consent;
95  }
96}