invoker/handler/discovery_handler.go

   1 // -
   2 //
   3 //      ========================LICENSE_START=================================
   4 //      O-RAN-SC
   5 //      %%
   6 //      Copyright (C) 2023: Nordix Foundation
   7 //      %%
   8 //      Licensed under the Apache License, Version 2.0 (the "License");
   9 //      you may not use this file except in compliance with the License.
  10 //      You may obtain a copy of the License at
  11 //
  12 //           http://www.apache.org/licenses/LICENSE-2.0
  13 //
  14 //      Unless required by applicable law or agreed to in writing, software
  15 //      distributed under the License is distributed on an "AS IS" BASIS,
  16 //      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17 //      See the License for the specific language governing permissions and
  18 //      limitations under the License.
  19 //      ========================LICENSE_END===================================
  20 package handler
  21
  22 import (
  23         "encoding/json"
  24         "fmt"
  25         "net/http"
  26         "net/url"
  27
  28         "github.com/labstack/echo/v4"
  29         log "github.com/sirupsen/logrus"
  30         "oransc.org/nonrtric/capifinvoker/internal/discoverserviceapi"
  31 )
  32
  33 func DiscoverAPIs(server string) echo.HandlerFunc {
  34         return func(c echo.Context) error {
  35
  36                 invokerId := c.FormValue("api-invoker-id")
  37                 if invokerId == "" {
  38                         return c.Render(http.StatusOK, "discovery.html", map[string]interface{}{
  39                                 "isResponse": false,
  40                                 "isError":    false,
  41                         })
  42                 }
  43
  44                 //server format: http://localhost:8090
  45                 urlStr, _ := url.Parse(server + "/service-apis/v1/allServiceAPIs")
  46                 log.Infof("[Discovery API] apis to %v for invokerId: %v", urlStr, invokerId)
  47
  48                 //TODO check how to remove empty parameters
  49                 c.Request().ParseForm()
  50                 params := c.Request().Form
  51                 for key, val := range params {
  52                         if len(val) == 0 || val[0] == "" {
  53                                 params.Del(key)
  54                         }
  55                 }
  56                 urlStr.RawQuery = params.Encode()
  57
  58                 headers := map[string]string{
  59                         "Content-Type": "text/plain",
  60                 }
  61                 resp, err := makeRequest("GET", urlStr.String(), headers, nil)
  62                 if err != nil {
  63                         log.Errorf("[Discovery API] %v", fmt.Sprintf("error: %v", err))
  64                         return c.Render(http.StatusBadRequest, "discovery.html", map[string]interface{}{
  65                                 "response":   fmt.Sprintf("error: %v", err),
  66                                 "isError":    true,
  67                                 "isResponse": false,
  68                         })
  69                 }
  70                 log.Infof("[Discovery API] Response from service: %+v error: %v\n", string(resp), err)
  71
  72                 var resAPIs discoverserviceapi.DiscoveredAPIs
  73                 err = json.Unmarshal(resp, &resAPIs)
  74                 if err != nil {
  75                         log.Error("[Discovery API] error unmarshaling parameter DiscoveredAPIs as JSON")
  76                         return c.Render(http.StatusBadRequest, "discovery.html", map[string]interface{}{
  77                                 "isResponse": false,
  78                                 "isError":    true,
  79                                 "response":   "error unmarshaling parameter []DiscoveredAPIs as JSON",
  80                         })
  81                 }
  82
  83                 if len(*resAPIs.ServiceAPIDescriptions) == 0 {
  84                         log.Info("[Discovery API] There are no APIs availables for the specified parameters.")
  85                         return c.Render(http.StatusOK, "discovery.html", map[string]interface{}{
  86                                 "isResponse": false,
  87                                 "isError":    false,
  88                                 "isEmpty":    true,
  89                                 "response":   "There are no APIs availables for the specified parameters.",
  90                         })
  91                 }
  92
  93                 bytes, _ := json.Marshal(resAPIs)
  94                 return c.Render(http.StatusOK, "discovery.html", map[string]interface{}{
  95                         "isResponse": true,
  96                         "response":   string(bytes),
  97                 })
  98         }
  99 }