EvanFileService¶

Source	files

Service to handle files and its encryption / decryption.

readFilesAsArrayBuffer¶

inputsService.readFilesAsArrayBuffer(files, encryption);

Uploads an array of fils that were selected with an HTML 5 <input type=”file”> selector or using the evan-file-select component and transforms them into an encryption object.

Parameters¶

files - Array<any>: array of files selected using an html 5 input type=”file” element or using the EvanFileSelectComponent.

Returns¶

Promise<any>: uploaded files transformed into an encryption object

Example¶

const urlCreator = (<any>window).URL || (<any>window).webkitURL;
const blobURI = urlCreator.createObjectURL(this.fileSelect[0]);
// transform to array buffer so we can save it within the queue
const arrayBuffer = await this.fileService.readFilesAsArrayBuffer(
  [ this.fileSelect[0] ]);

// transform file object
this.formData.picture = {
  blobURI: this._DomSanitizer.bypassSecurityTrustUrl(blobURI),
  file: arrayBuffer[0].file,
  fileType: arrayBuffer[0].type,
  name: arrayBuffer[0].name,
};

equalizeFileStructure¶

inputsService.equalizeFileStructure(files);

Transform an array of files to be valid for display (including file, blob and blobURI) (normally the result of the EvanPictureComponent or EvanFileSelectComponent)

Parameters¶

files - Array<any>: array of files that should be checked

Returns¶

Promise<Array<any>>: array of valid files

Example¶

const parsed = JSON.parse(formData[key]);

if (parsed.private) {
  formData[key] = (await this.bcc.dataContract.decrypt(
    formData[key],
    contractAddress,
    activeAccount,
    '*'
  )).private;

  // transform blobURI to security trust url, so the ui can show it
  formData[key] = await this.fileService.equalizeFileStructure(formData[key]);
} else {
  formData[key] = parsed;
}

downloadMobile¶

inputsService.downloadMobile(name, blob);

checks for an active dom element and scrolls the users viewport to this input

Parameters¶

name - string: name of the file
blob - Blob: Blob of the file

Returns¶

Promise<any>: uploaded files transformed into an encryption object

Example¶

<a ion-button outline icon-only clear color="red"
  *ngIf="utils.isMobile()" target="_blank" (click)="fileService.downloadMobile(file.name, file.blob)">
  <ion-icon name="download"></ion-icon>
</a>