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server.go
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server.go
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package main
import (
"encoding/json"
"fmt"
"html/template"
"io/ioutil"
"log"
"net/http"
"os"
"github.com/cmd-e/cscalc-web/calculator"
"github.com/cmd-e/cscalc-web/tools"
)
func init() {
tools.Templates = template.Must(template.ParseGlob("./static/html/*.html"))
}
func main() {
http.HandleFunc("/", index)
http.HandleFunc("/calculate", calculate)
http.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.Dir("./static/"))))
port := os.Getenv("PORT")
if port == "" {
port = "8080"
}
log.Printf("Port: %s", port)
log.Fatal(http.ListenAndServe(":"+port, nil))
}
func index(w http.ResponseWriter, r *http.Request) {
w.Header().Add("Access-Control-Allow-Origin", "*")
err := tools.Templates.ExecuteTemplate(w, "index.html", nil)
if err != nil {
fmt.Fprintf(w, "main.go tools.Templates.ExecuteTemplate error: %s", err.Error())
w.WriteHeader(http.StatusInternalServerError)
return
}
}
type data struct {
AverageMark float32 `json:"averageMark"`
ExamMark float32 `json:"examMark"`
}
type responseData struct {
FinalMark float32 `json:"finalMark"`
}
func calculate(w http.ResponseWriter, r *http.Request) {
w.Header().Add("Access-Control-Allow-Headers", "Content-Type, Origin, Accept, token")
w.Header().Add("Access-Control-Allow-Origin", "*")
w.Header().Add("Access-Control-Allow-Methods", "GET, POST,OPTIONS")
if r.Method == http.MethodOptions {
w.WriteHeader(http.StatusOK)
return
}
if r.Method != http.MethodPost {
http.Redirect(w, r, "/", http.StatusSeeOther)
return
}
requestBody, err := ioutil.ReadAll(r.Body)
if err != nil {
fmt.Fprintf(w, "Error occurred while reading data: %s", err.Error())
w.WriteHeader(http.StatusInternalServerError)
return
}
d := data{}
err = json.Unmarshal(requestBody, &d)
if err != nil {
fmt.Fprintf(w, "Error occurred while unmarshaling json: %s", err.Error())
w.WriteHeader(http.StatusInternalServerError)
return
}
w.Header().Set("Content-Type", "application/json")
var errStruct tools.ErrStruct
if errStruct = tools.MarksAreValid(d.AverageMark, d.ExamMark); errStruct.IsError {
w.WriteHeader(http.StatusBadRequest)
json.NewEncoder(w).Encode(errStruct)
return
}
fm := responseData{FinalMark: calculator.CalculateFinal(d.AverageMark, d.ExamMark)}
json.NewEncoder(w).Encode(fm)
}