@tjc-group/odata-v2-service-metadata/src/metadata.ts

Limited version of OData metadata response for OData V2, based on odata-v4-service-metadata

import { Edm } from "@tjc-group/odata-v4-metadata"
import { XmlMetadata } from './xmlMetadataV2'
import { defineEntities } from './defineEntitiesV2'
import { Request, Response, RequestHandler } from 'express';

export class ServiceMetadata {
    static processMetadataJson(json, options?: Object) {
        var edmx = new Edm.Edmx(json);
        return new this(edmx, options);
    }
    static processEdmx(edmx: Edm.Edmx, options?: Object) {
        return new this(edmx, options);
    }
    static defineEntities(entityConfig: Object, options?: Object) {
        var json = defineEntities(entityConfig)
        var edmx = new Edm.Edmx(json);
        return new this(edmx, options);
    }

    edmx: Edm.Edmx
    protected data: any
    constructor(edmx: Edm.Edmx, options?: Object) {
        this.edmx = edmx;
        this.process(edmx, options);
    }
    
    document(format?: string) {
        switch (format){
            case 'json':
            case 'application/json':
                throw new Error('Not implemented');
            default: return this.data;
        }
    }
    
    process(edmx: Edm.Edmx, options?: Object) {
        var xmlMetadata = new XmlMetadata(options, edmx);
        this.data = xmlMetadata.processMetadata();
    }
    
    requestHandler(format?: string): (_: Request, res: Response, __: RequestHandler) => void  {
        return (_:Request, res:Response, __:RequestHandler) => {
            res.set('Content-Type', 'application/xml');
            res.send(this.document(format));
        };
    }

    valueOf(): any {
        return this.data;
    }
}