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package server
import (
_ "embed"
"encoding/json"
"fmt"
"html/template"
"log"
"net/http"
"net/url"
"os"
"strings"
"time"
"github.com/benbusby/farside/db"
"github.com/benbusby/farside/services"
)
//go:embed index.html
var indexHTML string
//go:embed route.html
var routeHTML string
type indexData struct {
LastUpdated time.Time
ServiceList []services.Service
}
type routeData struct {
InstanceURL string
}
func home(w http.ResponseWriter, r *http.Request) {
serviceList := db.GetServiceList()
data := indexData{
LastUpdated: db.LastUpdate,
ServiceList: serviceList,
}
tmpl, err := template.New("").Parse(indexHTML)
if err != nil {
log.Println(err)
http.Error(w, "Error parsing template", http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "text/html")
err = tmpl.Execute(w, data)
if err != nil {
log.Println(err)
http.Error(w, "Error executing template", http.StatusInternalServerError)
}
}
func state(w http.ResponseWriter, r *http.Request) {
storedServices := db.GetServiceList()
jsonData, _ := json.Marshal(storedServices)
w.Header().Set("Content-Type", "application/json")
_, _ = w.Write(jsonData)
}
func baseRouting(w http.ResponseWriter, r *http.Request) {
routing(w, r, false, r.URL.RawQuery)
}
func jsRouting(w http.ResponseWriter, r *http.Request) {
r.URL.Path = strings.Replace(r.URL.Path, "/_", "", 1)
routing(w, r, true, r.URL.RawQuery)
}
func routing(w http.ResponseWriter, r *http.Request, jsEnabled bool, query string) {
value := r.PathValue("routing")
if len(value) == 0 {
value = r.URL.Path
}
parsedURL, _ := url.Parse(value)
path := strings.TrimPrefix(parsedURL.Path, "/")
segments := strings.Split(path, "/")
if len(segments[0]) == 0 {
http.Redirect(w, r, "", http.StatusTemporaryRedirect)
}
target, err := services.MatchRequest(segments[0])
if err != nil {
errMsg := fmt.Sprintf("No routing found for '%s'", segments[0])
log.Printf("Error during match request: %v\n", err)
http.Error(w, errMsg, http.StatusBadRequest)
return
}
var servicePath string
if target == "breezewiki" {
// Breezewiki requires the subdomain of the instance to be
// preserved for correct routing
splitDomain := strings.Split(path, ".")
if len(splitDomain) > 2 {
servicePath = strings.Split(path, ".")[0]
}
}
instance, err := db.GetInstance(target, servicePath)
if err != nil {
log.Printf("Error fetching instance from db: %v\n", err)
http.Error(
w,
"Error fetching instance for "+target,
http.StatusInternalServerError)
return
}
if len(segments) > 1 {
targetPath := strings.Join(segments[1:], "/")
instance = instance + "/" + targetPath
}
w.Header().Set("Cache-Control", "no-store, no-cache, must-revalidate, max-age=0")
w.Header().Set("Pragma", "no-cache")
w.Header().Set("Expires", "0")
instance += fmt.Sprintf("?%s", query)
if jsEnabled {
data := routeData{
InstanceURL: instance,
}
tmpl, _ := template.New("").Parse(routeHTML)
w.Header().Set("Content-Type", "text/html")
_ = tmpl.Execute(w, data)
} else {
http.Redirect(w, r, instance, http.StatusFound)
}
}
func RunServer() {
mux := http.NewServeMux()
mux.HandleFunc("/{$}", home)
mux.HandleFunc("/state/{$}", state)
mux.HandleFunc("/{routing...}", baseRouting)
mux.HandleFunc("/_/{routing...}", jsRouting)
port := os.Getenv("FARSIDE_PORT")
if len(port) == 0 {
port = "4001"
}
log.Println("Starting server on http://localhost:" + port)
err := http.ListenAndServe(":"+port, mux)
if err != nil {
log.Fatal(err)
}
}
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