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feat: Add ContentTypeReplacer to conversion chain

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This commit is contained in:
Joachim Van Herwegen
2021-10-26 16:55:34 +02:00
parent fa94c7d4bb
commit fdd42bb7b3
3 changed files with 25 additions and 10 deletions
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23
src/storage/conversion/ContentTypeReplacer.ts
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@@ -4,7 +4,7 @@ import type { ValuePreferences } from '../../http/representation/RepresentationP
import { NotImplementedHttpError } from '../../util/errors/NotImplementedHttpError';
import { matchesMediaType, getConversionTarget } from './ConversionUtil';
import type { RepresentationConverterArgs } from './RepresentationConverter';
import { RepresentationConverter } from './RepresentationConverter';
import { TypedRepresentationConverter } from './TypedRepresentationConverter';
/**
* A {@link RepresentationConverter} that changes the content type
@@ -13,7 +13,7 @@ import { RepresentationConverter } from './RepresentationConverter';
* Useful for when a content type is binary-compatible with another one;
* for instance, all JSON-LD files are valid JSON files.
*/
export class ContentTypeReplacer extends RepresentationConverter {
export class ContentTypeReplacer extends TypedRepresentationConverter {
private readonly contentTypeMap: Record<string, ValuePreferences> = {};
/**
@@ -40,15 +40,22 @@ export class ContentTypeReplacer extends RepresentationConverter {
}
}
public async getOutputTypes(contentType: string): Promise<ValuePreferences> {
const supported = Object.keys(this.contentTypeMap)
.filter((type): boolean => matchesMediaType(contentType, type))
.map((type): ValuePreferences => this.contentTypeMap[type]);
return Object.assign({} as ValuePreferences, ...supported);
}
public async canHandle({ representation, preferences }: RepresentationConverterArgs): Promise<void> {
this.getReplacementType(representation.metadata.contentType, preferences.type);
await this.getReplacementType(representation.metadata.contentType, preferences.type);
}
/**
* Changes the content type on the representation.
*/
public async handle({ representation, preferences }: RepresentationConverterArgs): Promise<Representation> {
const contentType = this.getReplacementType(representation.metadata.contentType, preferences.type);
const contentType = await this.getReplacementType(representation.metadata.contentType, preferences.type);
const metadata = new RepresentationMetadata(representation.metadata, contentType);
return { ...representation, metadata };
}
@@ -61,11 +68,9 @@ export class ContentTypeReplacer extends RepresentationConverter {
* Find a replacement content type that matches the preferences,
* or throws an error if none was found.
*/
private getReplacementType(contentType = 'unknown', preferred: ValuePreferences = {}): string {
const supported = Object.keys(this.contentTypeMap)
.filter((type): boolean => matchesMediaType(contentType, type))
.map((type): ValuePreferences => this.contentTypeMap[type]);
const match = getConversionTarget(Object.assign({} as ValuePreferences, ...supported), preferred);
private async getReplacementType(contentType = 'unknown', preferred: ValuePreferences = {}): Promise<string> {
const supported = await this.getOutputTypes(contentType);
const match = getConversionTarget(supported, preferred);
if (!match) {
throw new NotImplementedHttpError(`Cannot convert from ${contentType} to ${Object.keys(preferred)}`);
}