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* Image service.
* @packageDocumentation
*/
import { Injectable, Inject, forwardRef } from '@nestjs/common';
import { DBService } from '../db/db.service';
import { ResourceService } from '../resource/resource.service';
import { NBImage } from './image.interface';
import { ServiceException } from '../service.exception';
import * as jimp from 'jimp';
/**
* Image table name.
*/
export const imageTableName = 'NB_IMAGE';
/**
* Image table service.
*/
@Injectable()
export class ImageService {
constructor(
@Inject(forwardRef(() => DBService))
private readonly dbService: DBService,
@Inject(forwardRef(() => ResourceService))
private readonly resourceService: ResourceService,
) {}
/**
* Create a new image in the database.
*
* @param data The image data.
* @returns The new image record.
*/
public async createImage(data: string): Promise<NBImage> {
const imageData = await this.shrinkImageAutoBase64(data);
const maxImageSize = await this.resourceService.getResource<number>(
'MAX_IMAGE_SIZE',
);
Eif (imageData.length < maxImageSize) {
return this.dbService.create<NBImage>(imageTableName, {
data: imageData,
});
} else {
throw new ServiceException('Image is too large');
}
}
/**
* Determine whether or not an image exists.
*
* @param imageID The ID of the image.
* @returns Whether or not the image exists.
*/
public async imageExists(imageID: string): Promise<boolean> {
const image = await this.dbService.getByID<NBImage>(
imageTableName,
imageID,
);
return !!image;
}
/**
* Get an image.
*
* @param imageID The ID of the image.
* @returns The image record.
*/
public async getImage(imageID: string): Promise<NBImage> {
const image = await this.dbService.getByID<NBImage>(
imageTableName,
imageID,
);
if (image) {
return image;
} else {
throw new ServiceException('Image does not exist');
}
}
/**
* Set an image's data.
*
* @param imageID The ID of the image.
* @param newData The new image data.
* @returns The updated image record.
*/
public async setImageData(
imageID: string,
newData: string,
): Promise<NBImage> {
const imageData = await this.shrinkImageAutoBase64(newData);
const maxImageSize = await this.resourceService.getResource<number>(
'MAX_IMAGE_SIZE',
);
Eif (imageData.length < maxImageSize) {
const imageExists = await this.imageExists(imageID);
if (imageExists) {
return this.dbService.updateByID<NBImage>(imageTableName, imageID, {
data: imageData,
});
} else {
throw new ServiceException('Image does not exist');
}
} else {
throw new ServiceException('Image is too large');
}
}
/**
* Delete an image.
*
* @param imageID The ID of the image.
*/
public async deleteImage(imageID: string): Promise<void> {
await this.dbService.deleteByID(imageTableName, imageID);
}
/**
* Shrink an image.
*
* @param image The image buffer.
* @param factor The scale factor.
* @param quality The JPEG quality.
* @returns The resulting image buffer.
*/
private async shrinkImage(
image: Buffer,
factor: number,
quality = 100,
): Promise<Buffer> {
const img = await jimp.read(image);
const width = img.bitmap.width;
return img
.resize(Math.floor(width * factor), jimp.AUTO)
.quality(quality)
.getBufferAsync(jimp.MIME_JPEG);
}
/**
* Shrink an image to a maximum size.
*
* @param image The image buffer.
* @param maxWidth The maximum width of the image.
* @param maxHeight The maximum height of the image.
* @returns The resulting image buffer.
*/
private async shrinkImageToSize(
image: Buffer,
maxWidth = 1920,
maxHeight = 1080,
): Promise<Buffer> {
const img = await jimp.read(image);
const existingRatio = img.bitmap.width / img.bitmap.height;
const potentialRatio = maxWidth / maxHeight;
if (existingRatio > potentialRatio) {
return img.resize(maxWidth, jimp.AUTO).getBufferAsync(jimp.MIME_JPEG);
} else {
return img.resize(jimp.AUTO, maxHeight).getBufferAsync(jimp.MIME_JPEG);
}
}
/**
* Shrink an image automatically.
*
* @param image The image buffer.
* @param maxImageSize The maximum size of the image.
* @param maxWidth The maximum width of the image.
* @param maxHeight The maximum height of the image.
* @param factor The scale factor.
* @param quality The JPEG quality.
* @returns The resulting image buffer.
*/
private async shrinkImageAuto(
image: Buffer,
maxImageSize: number,
maxWidth = 1600,
maxHeight = 900,
factor = 0.7071,
quality = 40,
): Promise<Buffer> {
if (image.length < maxImageSize) {
return image;
} else {
const buffer = await this.shrinkImageToSize(image, maxWidth, maxHeight);
if (buffer.length < maxImageSize) {
return buffer;
} else {
let newBuffer = await this.shrinkImage(buffer, factor, quality);
while (newBuffer.length >= maxImageSize) {
newBuffer = await this.shrinkImage(newBuffer, factor, quality);
}
return newBuffer;
}
}
}
/**
* Shrinks a base64 encoded image automatically.
*
* @param imageB64 The base64 image.
* @param maxWidth The maximum width of the image.
* @param maxHeight The maximum height of the image.
* @param factor The scale factor.
* @param quality The JPEG quality.
* @returns The shrunk base64 image.
*/
private async shrinkImageAutoBase64(
imageB64: string,
maxWidth = 1600,
maxHeight = 900,
factor = 0.7071,
quality = 40,
): Promise<string> {
const maxImageSize = await this.resourceService.getResource<number>(
'MAX_IMAGE_SIZE',
);
Eif (imageB64.length < maxImageSize) {
return imageB64;
} else {
const imageBuffer = Buffer.from(imageB64, 'base64');
let shrunkImageBuffer = await this.shrinkImageToSize(
imageBuffer,
maxWidth,
maxHeight,
);
let shrunkImageB64 = shrunkImageBuffer.toString('base64');
while (shrunkImageB64.length >= maxImageSize) {
shrunkImageBuffer = await this.shrinkImage(
shrunkImageBuffer,
factor,
quality,
);
shrunkImageB64 = shrunkImageBuffer.toString('base64');
}
return shrunkImageB64;
}
}
}
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