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package main
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import (
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"encoding/json"
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"github.com/google/uuid"
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jsonschema "github.com/santhosh-tekuri/jsonschema/v5"
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"log"
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"net/http"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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)
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type HTTPError struct {
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code int
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root error
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}
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func (e *HTTPError) Error() string {
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msg := http.StatusText(e.code)
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if e.root != nil {
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msg += ": " + e.root.Error()
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}
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return msg
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}
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type SiteHandler struct {
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name string
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path string
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schema *jsonschema.Schema
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}
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func NewSiteHandler(site_name string, site_path string) (*SiteHandler, error) {
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schema, err := jsonschema.Compile(filepath.Join(site_path, ".schema.json"))
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if err != nil {
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return nil, err
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}
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return &SiteHandler{site_name, site_path, schema}, nil
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}
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func NewMeta() (map[string]interface{}, error) {
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id, err := uuid.NewUUID()
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if err != nil {
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return nil, err
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}
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key, err := uuid.NewRandom()
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if err != nil {
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return nil, err
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}
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now := time.Now().UTC().String()
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data := make(map[string]interface{})
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data["id"] = id.String()
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data["key"] = key.String()
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data["submitted"] = now
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return data, nil
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}
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func processValue(typ string, value string) interface{} {
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switch typ {
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case "integer":
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val, err := strconv.Atoi(value)
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if err != nil {
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return value
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}
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return val
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case "number":
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val, err := strconv.ParseFloat(value, 64)
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if err != nil {
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return value
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}
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return val
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case "boolean":
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return value == "true"
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default:
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return value
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}
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}
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func (h *SiteHandler) collectData(r *http.Request) (map[string]interface{}, error) {
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err := r.ParseMultipartForm(0)
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if err != nil {
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return nil, &HTTPError{http.StatusBadRequest, err}
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}
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data := make(map[string]interface{})
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for key, values := range r.PostForm {
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if key == "_key" {
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continue
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}
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key_schema, ok := h.schema.Properties[key]
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val_type := ""
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if ok && key_schema.Types[0] == "array" {
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if key_schema.Items2020 != nil {
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val_type = key_schema.Items2020.Types[0]
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}
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} else if ok {
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val_type = key_schema.Types[0]
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}
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if ok && key_schema.Types[0] != "array" && len(values) == 1 {
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data[key] = processValue(val_type, values[0])
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} else {
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tmp := make([]interface{}, len(values))
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for i := range values {
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tmp[i] = processValue(val_type, values[i])
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}
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data[key] = tmp
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}
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}
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return data, nil
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}
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func (h *SiteHandler) handlePUTPOST(w http.ResponseWriter, r *http.Request, meta map[string]interface{}) error {
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data, err := h.collectData(r)
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if err != nil {
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return err
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}
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if err := h.schema.Validate(data); err != nil {
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return &HTTPError{http.StatusNotAcceptable, nil}
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}
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if meta == nil {
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meta, err = NewMeta()
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if err != nil {
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return err
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}
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} else {
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meta["updated"] = time.Now().UTC().String()
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}
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data["$meta"] = meta
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bytes, err := json.Marshal(data)
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if err != nil {
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return err
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}
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if err := os.WriteFile(
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filepath.Join(h.path, meta["id"].(string)+".json"),
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bytes,
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0644,
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); err != nil {
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return err
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}
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log.Printf("%s %s", r.Method, meta["id"])
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w.Header().Set("Content-Type", "application/json")
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w.Write(bytes)
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return nil
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}
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func (h *SiteHandler) handle(w http.ResponseWriter, r *http.Request) error {
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parts := strings.Split(r.URL.Path, "/")
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if len(parts) != 3 || parts[1] != h.name {
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return &HTTPError{http.StatusInternalServerError, nil}
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}
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id := parts[2]
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if id == "" {
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if r.Method != "POST" {
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return &HTTPError{http.StatusMethodNotAllowed, nil}
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}
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return h.handlePUTPOST(w, r, nil)
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}
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var data map[string]interface{}
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bytes, err := os.ReadFile(filepath.Join(h.path, id+".json"))
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if err != nil {
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return &HTTPError{http.StatusNotFound, nil}
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}
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if err := json.Unmarshal(bytes, &data); err != nil {
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return err
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}
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meta := data["$meta"].(map[string]interface{})
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key := r.FormValue("_key")
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if meta["key"] != key {
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return &HTTPError{http.StatusUnauthorized, nil}
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}
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if r.Method == "PUT" {
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return h.handlePUTPOST(w, r, meta)
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} else if r.Method == "GET" {
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w.Header().Set("Content-Type", "application/json")
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w.Write(bytes)
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return nil
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}
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return &HTTPError{http.StatusMethodNotAllowed, nil}
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}
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func (h *SiteHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
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err := h.handle(w, r)
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if err != nil {
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var code int
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switch e := err.(type) {
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case *HTTPError:
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code = e.code
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if e.root != nil {
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log.Printf("Error: %#v", err)
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}
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default:
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code = http.StatusInternalServerError
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log.Printf("Error: %#v", err)
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}
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http.Error(w, http.StatusText(code), code)
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}
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}
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func main() {
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sites, err := filepath.Glob(os.Args[1] + "/*")
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if err != nil {
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log.Fatalf("Error locating sites: %#v", err)
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}
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for _, site_path := range sites {
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site_name := filepath.Base(site_path)
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log.Printf("loading site %s", site_name)
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handler, err := NewSiteHandler(site_name, site_path)
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if err != nil {
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log.Fatalf("NewSiteHandler %s: ", site_path, err)
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}
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http.Handle("/"+site_name+"/", handler)
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}
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log.Printf("ready, listening on :3000")
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err = http.ListenAndServe(":3000", nil) // setting listening port
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if err != nil {
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log.Fatal("ListenAndServe: ", err)
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}
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}
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