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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,177 @@ | ||
| import { Readable } from 'stream'; | ||
| import arrayifyStream from 'arrayify-stream'; | ||
| import { DataFactory } from 'n3'; | ||
| import type { NamedNode } from 'rdf-js'; | ||
| import { RepresentationMetadata } from '../../ldp/representation/RepresentationMetadata'; | ||
| import type { ResourceIdentifier } from '../../ldp/representation/ResourceIdentifier'; | ||
| import { NotFoundHttpError } from '../../util/errors/NotFoundHttpError'; | ||
| import type { MetadataController } from '../../util/MetadataController'; | ||
| import { ensureTrailingSlash } from '../../util/Util'; | ||
| import type { DataAccessor } from './DataAccessor'; | ||
|
|
||
| interface DataEntry { | ||
| data: any[]; | ||
| metadata?: RepresentationMetadata; | ||
| } | ||
| interface ContainerEntry { | ||
| entries: { [name: string]: CacheEntry }; | ||
| metadata?: RepresentationMetadata; | ||
| } | ||
| type CacheEntry = DataEntry | ContainerEntry; | ||
|
|
||
| class ArrayReadable extends Readable { | ||
| private readonly data: any[]; | ||
| private idx: number; | ||
|
|
||
| public constructor(data: any[]) { | ||
| super({ objectMode: true }); | ||
| this.data = data; | ||
| this.idx = 0; | ||
| } | ||
|
|
||
| // eslint-disable-next-line @typescript-eslint/naming-convention | ||
| public _read(): void { | ||
| if (this.idx < this.data.length) { | ||
| this.push(this.data[this.idx]); | ||
| this.idx += 1; | ||
| } else { | ||
| this.push(null); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| export class InMemoryDataAccessor implements DataAccessor { | ||
| private readonly base: string; | ||
| private readonly store: ContainerEntry; | ||
| private readonly metadataController: MetadataController; | ||
|
|
||
| public constructor(base: string, metadataController: MetadataController) { | ||
| this.base = ensureTrailingSlash(base); | ||
| this.metadataController = metadataController; | ||
|
|
||
| const metadata = new RepresentationMetadata(this.base); | ||
| metadata.addQuads(this.metadataController.generateResourceQuads(DataFactory.namedNode(this.base), true)); | ||
| this.store = { entries: {}, metadata }; | ||
| } | ||
|
|
||
| public async canHandle(): Promise<void> { | ||
| // All data is supported since streams never get read, only copied | ||
| } | ||
|
|
||
| public async getData(identifier: ResourceIdentifier): Promise<Readable> { | ||
| const entry = this.getEntry(identifier); | ||
| if (!this.isDataEntry(entry)) { | ||
| throw new NotFoundHttpError(); | ||
| } | ||
| return new ArrayReadable(entry.data); | ||
| } | ||
|
|
||
| public async getMetadata(identifier: ResourceIdentifier): Promise<RepresentationMetadata> { | ||
| const entry = this.getEntry(identifier); | ||
| if (this.isDataEntry(entry) === identifier.path.endsWith('/')) { | ||
| throw new NotFoundHttpError(); | ||
| } | ||
| return this.generateMetadata(identifier, entry); | ||
| } | ||
|
|
||
| public async getNormalizedMetadata(identifier: ResourceIdentifier): Promise<RepresentationMetadata> { | ||
| const entry = this.getEntry(identifier); | ||
| return this.generateMetadata(identifier, entry); | ||
| } | ||
|
|
||
| public async writeDataResource(identifier: ResourceIdentifier, data: Readable, metadata?: RepresentationMetadata): | ||
| Promise<void> { | ||
| const { parent, name } = this.getParentEntry(identifier); | ||
| parent.entries[name] = { | ||
| // Drain original stream and create copy | ||
| data: await arrayifyStream(data), | ||
| metadata, | ||
| }; | ||
| } | ||
|
|
||
| public async writeContainer(identifier: ResourceIdentifier, metadata?: RepresentationMetadata): Promise<void> { | ||
| try { | ||
| // Overwrite existing metadata but keep children if container already exists | ||
| const entry = this.getEntry(identifier); | ||
| entry.metadata = metadata; | ||
| } catch (error: unknown) { | ||
| // Create new entry if it didn't exist yet | ||
| if (error instanceof NotFoundHttpError) { | ||
| const { parent, name } = this.getParentEntry(identifier); | ||
| parent.entries[name] = { | ||
| entries: {}, | ||
| metadata, | ||
| }; | ||
| } else { | ||
| throw error; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| public async deleteResource(identifier: ResourceIdentifier): Promise<void> { | ||
| const { parent, name } = this.getParentEntry(identifier); | ||
| if (!parent.entries[name]) { | ||
| throw new NotFoundHttpError(); | ||
| } | ||
| // eslint-disable-next-line @typescript-eslint/no-dynamic-delete | ||
| delete parent.entries[name]; | ||
| } | ||
|
|
||
| private isDataEntry(entry: CacheEntry): entry is DataEntry { | ||
| return Boolean((entry as DataEntry).data); | ||
| } | ||
|
|
||
| private getParentEntry(identifier: ResourceIdentifier): { parent: ContainerEntry; name: string } { | ||
| const parts = identifier.path.slice(this.base.length).split('/').filter((part): boolean => part.length > 0); | ||
|
|
||
| if (parts.length === 0) { | ||
| throw new Error('Root container has no parent.'); | ||
| } | ||
|
|
||
| // Name of the resource will be the last entry in the path | ||
| const name = parts[parts.length - 1]; | ||
|
|
||
| // All names preceding the last should be nested containers | ||
| const containers = parts.slice(0, -1); | ||
|
|
||
| // Step through the parts of the path up to the end | ||
| let parent = this.store; | ||
| for (const container of containers) { | ||
| const child = parent.entries[container]; | ||
| if (!child) { | ||
| throw new NotFoundHttpError(); | ||
| } else if (this.isDataEntry(child)) { | ||
| throw new Error('Invalid path.'); | ||
| } | ||
| parent = child; | ||
| } | ||
|
|
||
| return { parent, name }; | ||
| } | ||
|
|
||
| private getEntry(identifier: ResourceIdentifier): CacheEntry { | ||
| if (identifier.path === this.base) { | ||
| return this.store; | ||
| } | ||
| const { parent, name } = this.getParentEntry(identifier); | ||
| const entry = parent.entries[name]; | ||
| if (!entry) { | ||
| throw new NotFoundHttpError(); | ||
| } | ||
| return entry; | ||
| } | ||
|
|
||
| private generateMetadata(identifier: ResourceIdentifier, entry: CacheEntry): RepresentationMetadata { | ||
| const metadata = entry.metadata ? | ||
| new RepresentationMetadata(entry.metadata) : | ||
| new RepresentationMetadata(identifier.path); | ||
| if (!this.isDataEntry(entry)) { | ||
| const childNames = Object.keys(entry.entries).map((name): string => | ||
| `${identifier.path}${name}${this.isDataEntry(entry.entries[name]) ? '' : '/'}`); | ||
| const quads = this.metadataController | ||
| .generateContainerContainsResourceQuads(metadata.identifier as NamedNode, childNames); | ||
| metadata.addQuads(quads); | ||
| } | ||
| return metadata; | ||
| } | ||
| } |
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