Generate HTTP endpoints for environment sensors

- Move update request sanity checks to new method in handlers/util.go
- Change EnvironmentSensor.Value type because ParseFloat returns float64

handlers/util.go

@@ -0,0 +1,45 @@
+package handlers
+
+import (
+	"io"
+	"log"
+	"net/http"
+
+	"gitlab.hamburg.ccc.de/ccchh/spaceapid/config"
+	"gitlab.hamburg.ccc.de/ccchh/spaceapid/util"
+)
+
+// updateEndpointValidator checks BasicAuth credentials,
+// checks for correct HTTP method and then returns the request body
+func updateEndpointValidator(
+	authDB config.HTTPBACredentials, validCredentials []config.HTTPBACredentialID,
+	w http.ResponseWriter, r *http.Request,
+) (body []byte) {
+	// Check BasicAuth credentials
+	username, password, ok := r.BasicAuth()
+	if !ok || !util.CheckCredentials(authDB, validCredentials, username, password) {
+		log.Println("Unauthorized request from", r.RemoteAddr)
+		w.Header().Set("WWW-Authenticate", "Basic realm=\"space-api\"")
+		w.WriteHeader(http.StatusUnauthorized)
+		return
+	}
+
+	// Check if PUT method
+	if r.Method != http.MethodPut {
+		log.Println("Wrong Method: ", r.Method, "from", r.RemoteAddr, "at", r.RequestURI)
+		w.Header().Set("Allow", http.MethodPut)
+		w.WriteHeader(http.StatusMethodNotAllowed)
+		return
+	}
+
+	// Read request body
+	body, err := io.ReadAll(r.Body)
+	if err != nil {
+		log.Println("Failed to read request body from", r.RemoteAddr)
+		w.WriteHeader(http.StatusInternalServerError)
+		_, _ = io.WriteString(w, "Failed reading HTTP request body")
+		return
+	}
+
+	return
+}