diff options
Diffstat (limited to 'sdc-workflow-designer-ui/src/app/paletx/core/uuid.ts')
-rw-r--r-- | sdc-workflow-designer-ui/src/app/paletx/core/uuid.ts | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/sdc-workflow-designer-ui/src/app/paletx/core/uuid.ts b/sdc-workflow-designer-ui/src/app/paletx/core/uuid.ts new file mode 100644 index 00000000..58756b63 --- /dev/null +++ b/sdc-workflow-designer-ui/src/app/paletx/core/uuid.ts @@ -0,0 +1,36 @@ +/* tslint:disable:array-type member-access variable-name */ +export class UUID { + constructor() { + // + } + + static UUID(): string { + if (typeof(window.crypto) !== 'undefined' && + typeof(window.crypto.getRandomValues) !== 'undefined') { + // If we have a cryptographically secure PRNG, use that + let buf: Uint16Array = new Uint16Array(8); + window.crypto.getRandomValues(buf); + return ( + this.pad4(buf[0]) + this.pad4(buf[1]) + '-' + this.pad4(buf[2]) + + '-' + this.pad4(buf[3]) + '-' + this.pad4(buf[4]) + '-' + + this.pad4(buf[5]) + this.pad4(buf[6]) + this.pad4(buf[7])); + } else { + // Otherwise, just use Math.random + return this.random4() + this.random4() + '-' + this.random4() + '-' + + this.random4() + '-' + this.random4() + '-' + this.random4() + + this.random4() + this.random4(); + } + } + + private static pad4(num: number): string { + let ret: string = num.toString(16); + while (ret.length < 4) { + ret = '0' + ret; + } + return ret; + } + + private static random4(): string { + return Math.floor((1 + Math.random()) * 0x10000).toString(16).substring(1); + } +} |