initial commit

awl.go

@@ -0,0 +1,89 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+)
+
+const AWL_URL string = "https://buergerportal.awl-neuss.de/api/v1/calendar"
+
+func GetStreetNumbers() (map[string]int, error) {
+	url := AWL_URL + "/townarea-streets"
+	response, err := http.Get(url)
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+
+	content, err := io.ReadAll(response.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	var streets []struct {
+		Number int `json:"strasseNummer"`
+		Name string `json:"strasseBezeichnung"`
+	}
+	err = json.Unmarshal(content, &streets)
+	if err != nil {
+		return nil, err
+	}
+
+	nameToNumber := make(map[string]int, len(streets))
+	for _, street := range streets {
+		name := strings.ToLower(street.Name)
+		name = strings.Replace(name, " ", "-", -1)
+		name = strings.Replace(name, "--", "-", -1)
+		nameToNumber[name] = street.Number
+	}
+
+	return nameToNumber, nil
+}
+
+func AwlTomorrow(street, home int) ([]string, error)  {
+	startDate := time.Now().AddDate(0, 0, 1)
+	startDateFmt := startDate.Format("Jan 02 2006")
+
+	requestUrl := fmt.Sprintf(AWL_URL + "?startMonth=%s&streetNum=%d&homeNumber=%d", url.QueryEscape(startDateFmt), street, home)
+	response, err := http.Get(requestUrl)
+	if err != nil {
+		return nil, err
+	}
+	defer response.Body.Close()
+
+	content, err := io.ReadAll(response.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	var jsonBody map[string]map[string][]string
+	err = json.Unmarshal(content, &jsonBody)
+	if err != nil {
+		return nil, fmt.Errorf("could not parse json:\n%s\n%s", err.Error(), content)
+	}
+
+	if len(jsonBody) != 1 {
+		return nil, fmt.Errorf("unexpected awl response:\n%s", string(content))
+	}
+
+	currentMonth := fmt.Sprintf("%d-%d", startDate.Month()-1, startDate.Year())
+	currentDay := startDate.Format("2")
+
+	month, ok := jsonBody[currentMonth]
+	if !ok {
+		return nil, fmt.Errorf("could not access month (%s):\n%s", currentMonth, string(content))
+	}
+
+	day, ok := month[currentDay]
+	if !ok {
+		return nil, fmt.Errorf("could not access day (%s):\n%s", currentDay, string(content))
+	}
+
+	return day, nil
+}
+