client/src/app/shared/rest/rest-extractor.service.ts

   1 import { Injectable } from '@angular/core'
   2 import { Observable } from 'rxjs/Observable'
   3 import { HttpErrorResponse } from '@angular/common/http'
   4
   5 import { Utils } from '../utils'
   6 import { ResultList } from '../../../../../shared'
   7
   8 @Injectable()
   9 export class RestExtractor {
  10
  11   extractDataBool () {
  12     return true
  13   }
  14
  15   applyToResultListData <T> (result: ResultList<T>, fun: Function, additionalArgs?: any[]): ResultList<T> {
  16     const data: T[] = result.data
  17     const newData: T[] = []
  18
  19     data.forEach(d => newData.push(fun.call(this, d, additionalArgs)))
  20
  21     return {
  22       total: result.total,
  23       data: newData
  24     }
  25   }
  26
  27   convertResultListDateToHuman <T> (result: ResultList<T>, fieldsToConvert: string[] = [ 'createdAt' ]): ResultList<T> {
  28     return this.applyToResultListData(result, this.convertDateToHuman, [ fieldsToConvert ])
  29   }
  30
  31   convertDateToHuman (target: object, fieldsToConvert: string[]) {
  32     const source = {}
  33     fieldsToConvert.forEach(field => {
  34       source[field] = Utils.dateToHuman(target[field])
  35     })
  36
  37     return Object.assign(target, source)
  38   }
  39
  40   handleError (err: HttpErrorResponse) {
  41     let errorMessage
  42
  43     if (err.error instanceof Error) {
  44       // A client-side or network error occurred. Handle it accordingly.
  45       errorMessage = err.error.message
  46       console.error('An error occurred:', errorMessage)
  47     } else if (err.status !== undefined) {
  48       // A server-side error occurred.
  49       if (err.error) {
  50         if (err.error.errors) {
  51           const errors = err.error.errors
  52           const errorsArray: string[] = []
  53
  54           Object.keys(errors).forEach(key => {
  55             errorsArray.push(errors[key].msg)
  56           })
  57
  58           errorMessage = errorsArray.join('. ')
  59         } else if (err.error.error) {
  60           errorMessage = err.error.error
  61         }
  62       }
  63       errorMessage = errorMessage ? errorMessage : 'Unknown error.'
  64       console.error(`Backend returned code ${err.status}, body was: ${errorMessage}`)
  65     } else {
  66       errorMessage = err
  67     }
  68
  69     const errorObj = {
  70       message: errorMessage,
  71       status: undefined,
  72       body: undefined
  73     }
  74
  75     if (err.status) {
  76       errorObj.status = err.status
  77       errorObj.body = err.error
  78     }
  79
  80     return Observable.throw(errorObj)
  81   }
  82 }