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

   1 import { HttpErrorResponse } from '@angular/common/http'
   2 import { Injectable } from '@angular/core'
   3 import { dateToHuman } from '@app/shared/misc/utils'
   4 import { Observable } from 'rxjs/Observable'
   5 import { ResultList } from '../../../../../shared'
   6
   7 @Injectable()
   8 export class RestExtractor {
   9
  10   extractDataBool () {
  11     return true
  12   }
  13
  14   applyToResultListData <T> (result: ResultList<T>, fun: Function, additionalArgs?: any[]): ResultList<T> {
  15     const data: T[] = result.data
  16     const newData: T[] = []
  17
  18     data.forEach(d => newData.push(fun.apply(this, [ d ].concat(additionalArgs))))
  19
  20     return {
  21       total: result.total,
  22       data: newData
  23     }
  24   }
  25
  26   convertResultListDateToHuman <T> (result: ResultList<T>, fieldsToConvert: string[] = [ 'createdAt' ]): ResultList<T> {
  27     return this.applyToResultListData(result, this.convertDateToHuman, [ fieldsToConvert ])
  28   }
  29
  30   convertDateToHuman (target: object, fieldsToConvert: string[]) {
  31     fieldsToConvert.forEach(field => target[field] = dateToHuman(target[field]))
  32
  33     return target
  34   }
  35
  36   handleError (err: HttpErrorResponse) {
  37     let errorMessage
  38
  39     if (err.error instanceof Error) {
  40       // A client-side or network error occurred. Handle it accordingly.
  41       errorMessage = err.error.message
  42       console.error('An error occurred:', errorMessage)
  43     } else if (err.status !== undefined) {
  44       // A server-side error occurred.
  45       if (err.error && err.error.errors) {
  46         const errors = err.error.errors
  47         const errorsArray: string[] = []
  48
  49         Object.keys(errors).forEach(key => {
  50           errorsArray.push(errors[key].msg)
  51         })
  52
  53         errorMessage = errorsArray.join('. ')
  54       } else if (err.error && err.error.error) {
  55         errorMessage = err.error.error
  56       } else if (err.status === 413) {
  57         errorMessage = 'Request is too large for the server. Please contact you administrator if you want to increase the limit size.'
  58       } else if (err.status === 429) {
  59         const secondsLeft = err.headers.get('retry-after')
  60         if (secondsLeft) {
  61           const minutesLeft = Math.floor(parseInt(secondsLeft, 10) / 60)
  62           errorMessage = 'Too many attempts, please try again after ' + minutesLeft + ' minutes.'
  63         } else {
  64           errorMessage = 'Too many attempts, please try again later.'
  65         }
  66       } else if (err.status === 500) {
  67         errorMessage = 'Server error. Please retry later.'
  68       }
  69
  70       errorMessage = errorMessage ? errorMessage : 'Unknown error.'
  71       console.error(`Backend returned code ${err.status}, errorMessage is: ${errorMessage}`)
  72     } else {
  73       errorMessage = err
  74     }
  75
  76     const errorObj = {
  77       message: errorMessage,
  78       status: undefined,
  79       body: undefined
  80     }
  81
  82     if (err.status) {
  83       errorObj.status = err.status
  84       errorObj.body = err.error
  85     }
  86
  87     return Observable.throw(errorObj)
  88   }
  89 }