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@travetto/asset

Modular library for storing and retrieving binary assets with additional support for image modification at runtime

  • 0.4.0
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travetto: Asset

This module provides the framework for storing/retrieving assets. It also provides additional image functionality for on-the-fly resizing.

The asset module requires an AssetSource to provide functionality for reading and writing files. The AssetSource will need to be configured to be picked up by the AssetService

class AppConfig {
  @InjectableFactory()
  static getSource(): AssetSource {
    return new CustomAssetSource();
  }
}

After that, both AssetService and ImageService will rely upon the AssetSource to do their work. Below you can see an example of storing and retrieving a user's profile image.

Images

Storing of all assets uses the AssetService, but retrieval can either be from AssetService or ImageService depending on whether or not you want to perform image optimizations on retrieval. The ImageService users GraphicsMagick for image transformation. If the binary is not installed the framework will spin up a docker container to provide needed functionality.

@Injectable()
class UserProfileService {

  constructor(
    private asset: AssetService, 
    private image: ImageService,
    private model: ModelService
  ) {}

  async saveProfileImage(userId: string, image: Asset) {
    const path = await this.asset.store(image);
    const user = await this.model.getById(User, userId);
    user.profileImage = path;
    await this.model.update(User, user);
  }

  async getProfileImage(userId:string) {
    const user = await this.model.getById(userId);
    return await this.image.getImage(user.profileImage, { w: 100, h: 100 });
  }
}

Additionally, the ImageService currently supports the ability to resize an image on the fly, while auto orienting.

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Package last updated on 25 Oct 2018

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