Initial version with hard-coded values

README.md

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+# Fuz SpaceAPI endpoint
+
+Simple project in Go retrieving opening status from [presence button API](https://wiki.fuz.re/doku.php?id=projets:fuz:presence_button) and serving JSON according to [SpaceAPI specs](https://spaceapi.io/docs/).
+
+Read about it on [Fuz wiki](https://wiki.fuz.re/doku.php?id=projets:fuz:spaceapi).

main.go

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+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"os"
+	"strconv"
+	"time"
+)
+
+type Config struct {
+	PORT        string
+	PRESENCEAPI string
+}
+
+type SpaceAPI struct {
+	API                 string   `json:"api"`
+	Space               string   `json:"space"`
+	Logo                string   `json:"logo"`
+	URL                 string   `json:"url"`
+	Location            Location `json:"location"`
+	Contact             Contact  `json:"contact"`
+	IssueReportChannels []string `json:"issue_report_channels"`
+	State               State    `json:"state"`
+	Projects            []string `json:"projects"`
+}
+type Location struct {
+	Address string  `json:"address"`
+	Lon     float64 `json:"lon"`
+	Lat     float64 `json:"lat"`
+}
+type Contact struct {
+	Email   string `json:"email"`
+	IRC     string `json:"irc"`
+	ML      string `json:"ml"`
+	Twitter string `json:"twitter"`
+	Matrix  string `json:"matrix"`
+}
+type Icon struct {
+	Open   string `json:"open"`
+	Closed string `json:"closed"`
+}
+type State struct {
+	Icon       Icon   `json:"icon"`
+	Open       bool   `json:"open"`
+	Message    string `json:"message"`
+	LastChange int64  `json:"lastchange"`
+}
+
+type Status struct {
+	FuzIsOpen      bool      `json:"fuzIsOpen"`
+	LastSeenAsOpen bool      `json:"lastSeenAsOpen"`
+	LastSeen       time.Time `json:"lastSeen"`
+	LastOpened     time.Time `json:"lastOpened"`
+	LastClosed     time.Time `json:"lastClosed"`
+}
+
+var (
+	config = Config{
+		PORT: "8080",
+	}
+	spaceAPI = SpaceAPI{
+		API:   "0.13",
+		Space: "FUZ",
+		Logo:  "https://fuz.re/WWW.FUZ.RE_fichiers/5c02b2a84373a.png",
+		URL:   "https://fuz.re/",
+		Location: Location{
+			Address: "11-15 rue de la Réunion, Paris 75020, FRANCE",
+			Lat:     48.85343,
+			Lon:     2.40308,
+		},
+		Contact: Contact{
+			ML:      "fuz@fuz.re",
+			Twitter: "@fuz_re",
+			Matrix:  "https://matrix.to/#/#fuz_general:matrix.fuz.re",
+		},
+		IssueReportChannels: []string{
+			"ml",
+			"twitter",
+		},
+		State: State{
+			Icon: Icon{
+				Open:   "https://presence.fuz.re/img",
+				Closed: "https://presence.fuz.re/img",
+			},
+			Message: "open under conditions: https://wiki.fuz.re/doku.php?id=map",
+		},
+		Projects: []string{
+			"https://wiki.fuz.re/doku.php?id=projets:fuz:start",
+		},
+	}
+)
+
+func init() {
+	port := os.Getenv("PORT")
+	if val, _ := strconv.Atoi(port); val > 0 {
+		config.PORT = port
+	}
+	config.PRESENCEAPI = os.Getenv("PRESENCEAPI")
+	if config.PRESENCEAPI == "" {
+		panic("PRESENCEAPI is empty")
+	}
+}
+
+func rootHandler(w http.ResponseWriter, r *http.Request) {
+	if r.URL.Path != "/" {
+		http.NotFound(w, r)
+		return
+	}
+	resp, err := http.Get(config.PRESENCEAPI)
+	if err != nil {
+		w.WriteHeader(http.StatusServiceUnavailable)
+		return
+	}
+	defer resp.Body.Close()
+	var status Status
+	err = json.NewDecoder(resp.Body).Decode(&status)
+	if err != nil {
+		w.WriteHeader(http.StatusServiceUnavailable)
+		fmt.Fprintf(w, "err: bad json from presence API: %v", err)
+		return
+	}
+	spaceAPI.State.Open = status.FuzIsOpen
+	if status.FuzIsOpen {
+		spaceAPI.State.LastChange = status.LastOpened.Unix()
+	} else {
+		spaceAPI.State.LastChange = status.LastClosed.Unix()
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.Header().Set("Access-Control-Allow-Origin", "*")
+	w.Header().Set("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept")
+	e := json.NewEncoder(w)
+	e.SetIndent("", "    ")
+	e.Encode(spaceAPI)
+}
+
+func main() {
+	http.HandleFunc("/", rootHandler)
+	log.Fatal(http.ListenAndServe(":"+config.PORT, nil))
+}