map-dots/run/server.go

package run

import (
	"encoding/json"
	"errors"
	"fmt"
	"net/http"
	"net/url"
	"strconv"
	"time"
)

func Server() {
	fmt.Println("Server Mode Not Implemented")
	envCheck()

	http.HandleFunc("/traccar/", handleTraccarRequest)
	http.HandleFunc("/help/", handleHelpRequest)

	serverAddr := "localhost:8198" // Set your desired server address
	fmt.Printf("Server listening on http://%s\n", serverAddr)
	err := http.ListenAndServe(serverAddr, nil)
	if err != nil {
		fmt.Printf("Error starting server: %s\n", err)
	}
}

func handleTraccarRequest(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")

	queryValues := r.URL.Query()

	id, from, to, height, width, style, format, err := validateAndProcessParams(queryValues)
	if err != nil {
		http.Error(w, err.Error(), http.StatusBadRequest)
		return
	}

	fmt.Println(id, from, to, height, width, style, format)

	message := map[string]string{
		"status":  "success",
		"message": "Hello from map-dots",
	}

	// Marshal the JSON data
	jsonData, err := json.Marshal(message)
	if err != nil {
		http.Error(w, "JSON encoding error", http.StatusInternalServerError)
		return
	}

	// Write the JSON response
	w.Write(jsonData)
}

func validateAndProcessParams(queryValues url.Values) (string, string, string, int, int, string, string, error) {
	// Validate and process individual parameters
	id := queryValues.Get("id")
	if id == "" {
		return "", "", "", 0, 0, "", "", errors.New("missing required parameter 'id'")
	}

	from := queryValues.Get("from")
	to := queryValues.Get("to")
	heightStr := queryValues.Get("height")
	widthStr := queryValues.Get("width")
	style := queryValues.Get("style")
	format := queryValues.Get("format")

	// Apply defaults if parameters are not specified
	if from == "" {
		thirtyDaysAgo := time.Now().AddDate(0, 0, -30)
		from = thirtyDaysAgo.UTC().Format(time.RFC3339)
	}
	if to == "" {
		to = time.Now().UTC().Format(time.RFC3339)
	}
	if heightStr == "" {
		heightStr = "300"
	}
	if widthStr == "" {
		widthStr = "400"
	}
	if style == "" {
		style = "circle"
	}
	if format == "" {
		format = "png"
	}

	// VALIDATE HEIGHT/WIDTH
	// Convert height and width to integers
	height, errHeight := strconv.Atoi(heightStr)
	width, errWidth := strconv.Atoi(widthStr)
	if errHeight != nil || errWidth != nil {
		return "", "", "", 0, 0, "", "", errors.New("invalid height or width")
	}
	if height >= 7680 {
		return "", "", "", 0, 0, "", "", errors.New("invalid height, max: 7680")
	}
	if width >= 4320 {
		return "", "", "", 0, 0, "", "", errors.New("invalid width, max: 4320")
	}

	// VALIDATE FROM/TO
	// Parse the ISO date strings to time.Time objects
	fromTime, errFrom := time.Parse(time.RFC3339, from)
	toTime, errTo := time.Parse(time.RFC3339, to)
	if errFrom != nil || errTo != nil {
		return "", "", "", 0, 0, "", "", errors.New("invalid date format")
	}

	// Define the maximum allowable time duration (e.g., 90 days)
	maxAllowableDuration := time.Hour * 24 * 90

	// Calculate the duration between fromTime and toTime
	duration := toTime.Sub(fromTime)
	if duration > maxAllowableDuration {
		return "", "", "", 0, 0, "", "", errors.New("date range is too wide, max: 90d")
	}
	// ... Validate other parameters as needed

	return id, from, to, height, width, style, format, nil
}

func handleHelpRequest(w http.ResponseWriter, r *http.Request) {
	helpText := `
API Usage Information:

Endpoint: /traccar/:id
Parameters:
  - id: Traccar device ID
  - from: Start date in ISO format (90-days or less after 'to')
  - to: End date in ISO format
  - height: Output image height (1-7680)
  - width: Output image width (1-4320)
  - style: Output image style (circles)
  - format: Output image format (png, jpeg, gif, bmp, tiff, webp)

Example: /traccar/?id=1&from=2023-01-01T00:00:00Z&to=2023-02-01T00:00:00Z&height=600&width=800&style=circle&format=png
`

	w.Header().Set("Content-Type", "text/plain")
	fmt.Fprint(w, helpText)
}