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import {Application} from './Application';
import {IServiceHeaders} from './IServiceHeaders';
import {HTTPMethod} from './HTTPMethod';
import {ServiceResponse} from './ServiceResponse';
import * as http from 'http';
const NO_DATA: string = `|${0x0}|`;
export abstract class ServiceProvider {
private _app: Application;
public constructor(app: Application) {
this._app = app;
}
protected abstract _getBase(): string;
protected abstract _getPort(): number;
protected _getApp(): Application {
return this._app;
}
public getApp(): Application {
return this._app;
}
protected _getDomain(): string {
return '127.0.0.1';
}
private _getSecret(): string {
return this._app.getConfig().backend_authentication_secret;
}
public urlSuffix(): string {
return '/';
}
protected _getProtocol(): string {
return 'http';
}
public getVersion(): string {
return 'v1';
}
protected _createURL(url: string, queryParams?: any): string {
let queryString: string = '';
if (queryParams) {
for (let i in queryParams) {
if (queryString === '') {
queryString = '?' + i + '=' + queryParams[i];
}
else {
queryString += '&' + i + '=' + queryParams[i];
}
}
}
return `/api/${this._getBase()}/${this.getVersion()}/${url}${this.urlSuffix()}${queryString}`;
}
public request(method: HTTPMethod, url: string, accessToken: string, data: any, headers?: IServiceHeaders, additionalOptions?: any): Promise<ServiceResponse> {
return new Promise<ServiceResponse>((resolve, reject) => {
let httpOpts: http.RequestOptions = {
port: this._getPort(),
hostname: `${this._getDomain()}`,
method: method,
path: url,
headers: headers || {}
};
httpOpts.headers[this._app.getConfig().authentication_header] = accessToken;
httpOpts.headers[this._app.getConfig().backend_authentication_header] = this._getSecret();
Eif (!httpOpts.headers['Content-Type']) {
httpOpts.headers['Content-Type'] = 'application/json';
}
this._app.getLogger().trace(`ServiceProvider Request`);
this._app.getLogger().trace(`METHOD: ${httpOpts.method}`);
this._app.getLogger().trace(`HOSTNAME: ${httpOpts.hostname}`);
this._app.getLogger().trace(`PORT: ${httpOpts.port}`);
this._app.getLogger().trace(`PATH: ${httpOpts.path}`);
this._app.getLogger().trace(`HEADERS: ${JSON.stringify(httpOpts.headers)}`);
let responseData: Buffer = Buffer.from('');
let request: http.ClientRequest = http.request(httpOpts, (response: http.IncomingMessage) => {
this._app.getLogger().trace(`ServiceProvider Response Status: ${response.statusCode}`);
this._app.getLogger().trace(`ServiceProvider Response Headers: ${JSON.stringify(response.headers)}`);
response.on('data', (chunk: Buffer) => {
this._app.getLogger().trace(`ServiceProvider Received Chunk: ${chunk}`);
responseData = Buffer.concat([
responseData,
chunk
]);
});
response.on('end', () => {
this._app.getLogger().trace(`ServiceProvider request has completed.`);
resolve(new ServiceResponse(responseData, response));
});
response.on('error', (e: Error) => {
this._app.getLogger().error(e.message);
reject(e);
});
});
if (data && data !== NO_DATA) {
data = JSON.stringify(data);
request.write(data);
}
this._sendRequest(request);
});
}
private _sendRequest(request: http.ClientRequest): void {
request.end();
}
public get(url: string, accessToken: string, data?: any, headers?: IServiceHeaders, additionalOptions?: any): Promise<ServiceResponse> {
return this.request(HTTPMethod.GET, this._createURL(url, data), accessToken, NO_DATA, headers, additionalOptions);
}
public post(url: string, accessToken: string, data?: any, headers?: IServiceHeaders, additionalOptions?: any): Promise<ServiceResponse> {
return this.request(HTTPMethod.POST, this._createURL(url), accessToken, data, headers, additionalOptions);
}
public put(url: string, accessToken: string, data?: any, headers?: IServiceHeaders, additionalOptions?: any): Promise<ServiceResponse> {
return this.request(HTTPMethod.PUT, this._createURL(url), accessToken, data, headers, additionalOptions);
}
public delete(url: string, accessToken: string, data?: any, headers?: IServiceHeaders, additionalOptions?: any): Promise<ServiceResponse> {
return this.request(HTTPMethod.DELETE, this._createURL(url), accessToken, data, headers, additionalOptions);
}
}
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