feat:#39 added module and prof fetch

backend/service/fetch/v3/fetchProfs.go

@@ -0,0 +1,102 @@
+package v3
+
+import (
+	"encoding/json"
+	"log/slog"
+	"net/http"
+)
+
+/*
+
+{
+  "hydra:member": [
+    {
+      "@context": "string",
+      "@id": "string",
+      "@type": "string",
+      "id": "string",
+      "kuerzel": "string",
+      "nachname": "string",
+      "fakultaet": "https://example.com/",
+      "bezeichnung": "string",
+      "bezeichnungOne": "string"
+    }
+  ],
+  "hydra:totalItems": 0,
+  "hydra:view": {
+    "@id": "string",
+    "type": "string",
+    "hydra:first": "string",
+    "hydra:last": "string",
+    "hydra:previous": "string",
+    "hydra:next": "string"
+  },
+  "hydra:search": {
+    "@type": "string",
+    "hydra:template": "string",
+    "hydra:variableRepresentation": "string",
+    "hydra:mapping": [
+      {
+        "@type": "string",
+        "variable": "string",
+        "property": "string",
+        "required": true
+      }
+    ]
+  }
+}
+
+*/
+
+// professor Model for fetching json data
+
+type Professors struct {
+	TotalItems int         `json:"hydra:totalItems"`
+	Professors []Professor `json:"hydra:member"`
+}
+
+type Professor struct {
+	ID           string `json:"id"`
+	ShortCut     string `json:"kuerzel"`
+	LastName     string `json:"nachname"`
+	Faculty      string `json:"fakultaet"`
+	Description  string `json:"bezeichnung"`
+	Description1 string `json:"bezeichnungOne"`
+}
+
+func parseProfs(url string, client *http.Client) (Professors, error) {
+
+	// the url is paginated, so we need to fetch all pages
+	// example url: https://luna.htwk-leipzig.de/api/dozierende?page=1&itemsPerPage=100
+	// the itemsPerPage is set to 100, so we need to fetch all pages until we get an empty response
+
+	var fetchedProfs Professors
+	var itemsPerPage = 999
+
+	responses, err := paginatedFetch(url, itemsPerPage, client)
+
+	if err != nil {
+		slog.Error("Error while fetching paginated api", err)
+		return fetchedProfs, err
+	}
+
+	for _, response := range responses {
+		var hydra hydraResponse
+		err = json.Unmarshal([]byte(response), &hydra)
+		if err != nil {
+			slog.Error("Error while unmarshalling hydra response", err, url)
+			return fetchedProfs, err
+		}
+
+		var professors Professors
+		err = json.Unmarshal([]byte(response), &professors)
+		if err != nil {
+			slog.Error("Error while unmarshalling professors", err)
+			return fetchedProfs, err
+		}
+		fetchedProfs.TotalItems = professors.TotalItems
+		fetchedProfs.Professors = append(fetchedProfs.Professors, professors.Professors...)
+	}
+
+	return fetchedProfs, nil
+}