Adding Capif invoker

[nonrtric/plt/sme.git] / invoker / handler / discovery_handler.go

diff --git a/invoker/handler/discovery_handler.go b/invoker/handler/discovery_handler.go
new file mode 100644 (file)
index 0000000..f15ddc5
--- /dev/null
+++ b/invoker/handler/discovery_handler.go
@@ -0,0 +1,99 @@
+// -
+//
+//     ========================LICENSE_START=================================
+//     O-RAN-SC
+//     %%
+//     Copyright (C) 2023: Nordix Foundation
+//     %%
+//     Licensed under the Apache License, Version 2.0 (the "License");
+//     you may not use this file except in compliance with the License.
+//     You may obtain a copy of the License at
+//
+//          http://www.apache.org/licenses/LICENSE-2.0
+//
+//     Unless required by applicable law or agreed to in writing, software
+//     distributed under the License is distributed on an "AS IS" BASIS,
+//     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//     See the License for the specific language governing permissions and
+//     limitations under the License.
+//     ========================LICENSE_END===================================
+package handler
+
+import (
+       "encoding/json"
+       "fmt"
+       "net/http"
+       "net/url"
+
+       "github.com/labstack/echo/v4"
+       log "github.com/sirupsen/logrus"
+       "oransc.org/nonrtric/capifinvoker/internal/discoverserviceapi"
+)
+
+func DiscoverAPIs(server string) echo.HandlerFunc {
+       return func(c echo.Context) error {
+
+               invokerId := c.FormValue("api-invoker-id")
+               if invokerId == "" {
+                       return c.Render(http.StatusOK, "discovery.html", map[string]interface{}{
+                               "isResponse": false,
+                               "isError":    false,
+                       })
+               }
+
+               //server format: http://localhost:8090
+               urlStr, _ := url.Parse(server + "/service-apis/v1/allServiceAPIs")
+               log.Infof("[Discovery API] apis to %v for invokerId: %v", urlStr, invokerId)
+
+               //TODO check how to remove empty parameters
+               c.Request().ParseForm()
+               params := c.Request().Form
+               for key, val := range params {
+                       if len(val) == 0 || val[0] == "" {
+                               params.Del(key)
+                       }
+               }
+               urlStr.RawQuery = params.Encode()
+
+               headers := map[string]string{
+                       "Content-Type": "text/plain",
+               }
+               resp, err := makeRequest("GET", urlStr.String(), headers, nil)
+               if err != nil {
+                       log.Errorf("[Discovery API] %v", fmt.Sprintf("error: %v", err))
+                       return c.Render(http.StatusBadRequest, "discovery.html", map[string]interface{}{
+                               "response":   fmt.Sprintf("error: %v", err),
+                               "isError":    true,
+                               "isResponse": false,
+                       })
+               }
+               log.Infof("[Discovery API] Response from service: %+v error: %v\n", string(resp), err)
+
+               var resAPIs discoverserviceapi.DiscoveredAPIs
+               err = json.Unmarshal(resp, &resAPIs)
+               if err != nil {
+                       log.Error("[Discovery API] error unmarshaling parameter DiscoveredAPIs as JSON")
+                       return c.Render(http.StatusBadRequest, "discovery.html", map[string]interface{}{
+                               "isResponse": false,
+                               "isError":    true,
+                               "response":   "error unmarshaling parameter []DiscoveredAPIs as JSON",
+                       })
+               }
+
+               if len(*resAPIs.ServiceAPIDescriptions) == 0 {
+                       log.Info("[Discovery API] There are no APIs availables for the specified parameters.")
+                       return c.Render(http.StatusOK, "discovery.html", map[string]interface{}{
+                               "isResponse": false,
+                               "isError":    false,
+                               "isEmpty":    true,
+                               "response":   "There are no APIs availables for the specified parameters.",
+                       })
+               }
+
+               bytes, _ := json.Marshal(resAPIs)
+               return c.Render(http.StatusOK, "discovery.html", map[string]interface{}{
+                       "isResponse": true,
+                       "response":   string(bytes),
+               })
+       }
+}