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Merge pull request #160 from evert/refactor-representor-mapping
Refactor representor mapping
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| import * as LinkHeader from 'http-link-header'; | ||
| import { Link, LinkSet } from '../link'; | ||
| import { ContentType } from '../types'; | ||
| import Representor from './base'; | ||
| import HalRepresentor from './hal'; | ||
| import HtmlRepresentor from './html'; | ||
| import JsonApiRepresentor from './jsonapi'; | ||
| import SirenRepresentor from './siren'; | ||
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| export default class RepresentorHelper { | ||
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| private contentTypes: ContentType[]; | ||
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| constructor(contentTypes: ContentType[]) { | ||
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| const defaultTypes: ContentType[] = [ | ||
| { | ||
| mime: 'application/hal+json', | ||
| representor: 'hal', | ||
| q: '1.0', | ||
| }, | ||
| { | ||
| mime: 'application/vnd.api+json', | ||
| representor: 'jsonapi', | ||
| q: '0.9', | ||
| }, | ||
| { | ||
| mime: 'application/vnd.siren+json', | ||
| representor: 'siren', | ||
| q: '0.9', | ||
| }, | ||
| { | ||
| mime: 'application/json', | ||
| representor: 'hal', | ||
| q: '0.8', | ||
| }, | ||
| { | ||
| mime: 'text/html', | ||
| representor: 'html', | ||
| q: '0.7', | ||
| } | ||
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| ]; | ||
| this.contentTypes = defaultTypes.concat(contentTypes); | ||
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| } | ||
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| /** | ||
| * Generates an accept header string, based on registered Resource Types. | ||
| */ | ||
| getAcceptHeader(): string { | ||
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| return this.contentTypes | ||
| .map( contentType => { | ||
| let item = contentType.mime; | ||
| if (contentType.q) { item += ';q=' + contentType.q; } | ||
| return item; | ||
| } ) | ||
| .join(', '); | ||
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| } | ||
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| getMimeTypes(): string[] { | ||
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| return this.contentTypes.map( contentType => contentType.mime ); | ||
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| } | ||
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| create(uri: string, contentType: string, body: string | null, headerLinks: LinkSet): Representor<any> { | ||
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| const type = this.getRepresentorType(contentType); | ||
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| switch (type) { | ||
| case 'html' : | ||
| return new HtmlRepresentor(uri, contentType, body, headerLinks); | ||
| case 'hal' : | ||
| return new HalRepresentor(uri, contentType, body, headerLinks); | ||
| case 'jsonapi' : | ||
| return new JsonApiRepresentor(uri, contentType, body, headerLinks); | ||
| case 'siren' : | ||
| return new SirenRepresentor(uri, contentType, body, headerLinks); | ||
| default : | ||
| throw new Error('Unknown representor: ' + type); | ||
| } | ||
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| } | ||
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| /** | ||
| * Returns a representor object from a Fetch Response. | ||
| */ | ||
| createFromResponse(uri: string, response: Response, body: string): Representor<any> { | ||
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| const contentType = response.headers.get('Content-Type')!; | ||
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| const httpLinkHeader = response.headers.get('Link'); | ||
| const headerLinks: LinkSet = new Map(); | ||
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| if (httpLinkHeader) { | ||
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| for (const httpLink of LinkHeader.parse(httpLinkHeader).refs) { | ||
| // Looping through individual links | ||
| for (const rel of httpLink.rel.split(' ')) { | ||
| // Looping through space separated rel values. | ||
| const newLink = new Link({ | ||
| rel: rel, | ||
| context: uri, | ||
| href: httpLink.uri | ||
| }); | ||
| if (headerLinks.has(rel)) { | ||
| headerLinks.get(rel)!.push(newLink); | ||
| } else { | ||
| headerLinks.set(rel, [newLink]); | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| return this.create(uri, contentType, body, headerLinks); | ||
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| } | ||
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| private getRepresentorType(contentType: string) { | ||
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| if (contentType.indexOf(';') !== -1) { | ||
| contentType = contentType.split(';')[0]; | ||
| } | ||
| contentType = contentType.trim(); | ||
| const result = this.contentTypes.find(item => { | ||
| return item.mime === contentType; | ||
| }); | ||
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| if (!result) { | ||
| throw new Error('Could not find a representor for contentType: ' + contentType); | ||
| } | ||
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| return result.representor; | ||
| } | ||
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| } |
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