client/src/app/core/rest/rest.service.ts

   1 import { SortMeta } from 'primeng/api'
   2 import { HttpParams } from '@angular/common/http'
   3 import { Injectable } from '@angular/core'
   4 import { ComponentPaginationLight } from './component-pagination.model'
   5 import { RestPagination } from './rest-pagination'
   6
   7 interface QueryStringFilterPrefixes {
   8   [key: string]: {
   9     prefix: string
  10     handler?: (v: string) => string | number
  11     multiple?: boolean
  12     isBoolean?: boolean
  13   }
  14 }
  15
  16 type ParseQueryStringFilterResult = {
  17   [key: string]: string | number | boolean | (string | number | boolean)[]
  18 }
  19
  20 @Injectable()
  21 export class RestService {
  22
  23   addRestGetParams (params: HttpParams, pagination?: RestPagination, sort?: SortMeta | string) {
  24     let newParams = params
  25
  26     if (pagination !== undefined) {
  27       newParams = newParams.set('start', pagination.start.toString())
  28                            .set('count', pagination.count.toString())
  29     }
  30
  31     if (sort !== undefined) {
  32       let sortString = ''
  33
  34       if (typeof sort === 'string') {
  35         sortString = sort
  36       } else {
  37         const sortPrefix = sort.order === 1 ? '' : '-'
  38         sortString = sortPrefix + sort.field
  39       }
  40
  41       newParams = newParams.set('sort', sortString)
  42     }
  43
  44     return newParams
  45   }
  46
  47   addArrayParams (params: HttpParams, name: string, values: (string | number)[]) {
  48     for (const v of values) {
  49       params = params.append(name, v)
  50     }
  51
  52     return params
  53   }
  54
  55   addObjectParams (params: HttpParams, object: { [ name: string ]: any }) {
  56     for (const name of Object.keys(object)) {
  57       const value = object[name]
  58       if (value === undefined || value === null) continue
  59
  60       if (Array.isArray(value)) {
  61         params = this.addArrayParams(params, name, value)
  62       } else {
  63         params = params.append(name, value)
  64       }
  65     }
  66
  67     return params
  68   }
  69
  70   componentPaginationToRestPagination (componentPagination: ComponentPaginationLight): RestPagination {
  71     const start: number = (componentPagination.currentPage - 1) * componentPagination.itemsPerPage
  72     const count: number = componentPagination.itemsPerPage
  73
  74     return { start, count }
  75   }
  76
  77   parseQueryStringFilter (q: string, prefixes: QueryStringFilterPrefixes): ParseQueryStringFilterResult {
  78     if (!q) return {}
  79
  80     // Tokenize the strings using spaces that are not in quotes
  81     const tokens = q.match(/(?:[^\s"]+|"[^"]*")+/g)
  82                     .filter(token => !!token)
  83
  84     // Build prefix array
  85     const prefixeStrings = Object.values(prefixes)
  86                            .map(p => p.prefix)
  87
  88     // Search is the querystring minus defined filters
  89     const searchTokens = tokens.filter(t => {
  90       return prefixeStrings.every(prefixString => t.startsWith(prefixString) === false)
  91     })
  92
  93     const additionalFilters: ParseQueryStringFilterResult = {}
  94
  95     for (const prefixKey of Object.keys(prefixes)) {
  96       const prefixObj = prefixes[prefixKey]
  97       const prefix = prefixObj.prefix
  98
  99       const matchedTokens = tokens.filter(t => t.startsWith(prefix))
 100                                   .map(t => t.slice(prefix.length)) // Keep the value filter
 101                                   .map(t => t.replace(/^"|"$/g, '')) // Remove ""
 102                                   .map(t => {
 103                                     if (prefixObj.handler) return prefixObj.handler(t)
 104
 105                                     if (prefixObj.isBoolean) {
 106                                       if (t === 'true') return true
 107                                       if (t === 'false') return false
 108
 109                                       return undefined
 110                                     }
 111
 112                                     return t
 113                                   })
 114                                   .filter(t => t !== null && t !== undefined)
 115
 116       if (matchedTokens.length === 0) continue
 117
 118       additionalFilters[prefixKey] = prefixObj.multiple === true
 119         ? matchedTokens
 120         : matchedTokens[0]
 121     }
 122
 123     return {
 124       search: searchTokens.join(' ') || undefined,
 125
 126       ...additionalFilters
 127     }
 128   }
 129 }