Checkpoint
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6e27b73960
commit
d38c1d7fd6
18
index.html
18
index.html
@ -17,14 +17,24 @@
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<body>
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<div style="display: flex; align-items: center; flex-direction: column">
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<p>{{.Message}}</p>
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{{if .ShowForm}}
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<form action="" method="post">
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{{if .ShowInput}}
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<form action="/post" method="post">
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<label>
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API Key:
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<input type="text" name="key" required>
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How many hours should the timeout be?
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<input type="number" name="next" min="1" max="24" value="24" step="1" required>
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</label>
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<button type="submit">Submit</button>
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</form>
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{{end}}
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{{if .ShowLogin}}
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<form action="/login" method="post">
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<label>
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<input type="text" name="username" required>
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<input type="password" name="password" required>
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</label>
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<button type="submit">Login</button>
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</form>
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{{end}}
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</div>
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</body>
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282
main.go
282
main.go
@ -1,11 +1,15 @@
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package main
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import (
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"crypto/rand"
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"encoding/json"
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"fmt"
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"html/template"
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"math"
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"math/big"
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"net/http"
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"os"
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"strconv"
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"time"
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)
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@ -16,63 +20,72 @@ type Timestamp struct {
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type Store struct {
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Username string `json:"username"`
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Timestamps []int64 `json:"timestamps"`
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Timestamps []Timestamp `json:"timestamps"`
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}
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type PageData struct {
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Title string
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ShowForm bool
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Message string
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ShowLogin bool
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ShowInput bool
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}
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var Username string
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var Password string
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var DataDir string
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var DataStore string
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var Authorised []int64 // List of authorised "uuids"
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func main() {
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// Get environment variables
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Username = os.Getenv("USERNAME")
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fmt.Println("Username: ", Username)
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Password = os.Getenv("API_KEY")
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fmt.Println("API_KEY: ", Password)
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DataDir = os.Getenv("DATA_DIR")
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if DataDir == "" {
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DataDir = "./data"
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}
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fmt.Println("DATA_DIR: ", DataDir)
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DataStore = DataDir + "/data.json"
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Reset := os.Getenv("RESET")
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if Reset == "true" {
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if err := os.Remove(DataStore); err != nil {
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fmt.Println("Error removing file, check permissions")
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}
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if err := os.Remove(DataDir); err != nil {
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fmt.Println("Error removing directory, check permissions")
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}
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}
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// Check if directory exists, if not create it
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if _, err := os.Stat("./data"); os.IsNotExist(err) {
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err := os.Mkdir("./data", 0755)
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if _, err := os.Stat(DataDir); os.IsNotExist(err) {
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err := os.Mkdir(DataDir, 0755)
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if err != nil {
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fmt.Println("Error creating directory, check permissions")
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os.Exit(1)
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}
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}
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// Set environment variables
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RESET := os.Getenv("RESET")
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if RESET == "true" {
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if err := os.Remove("./data/taken.json"); err != nil {
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fmt.Println("Error removing file, check permissions")
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}
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}
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API_KEY := os.Getenv("API_KEY")
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fmt.Println("API_KEY: ", API_KEY)
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// Start server
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http.HandleFunc("/", index)
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if err := http.ListenAndServe(":8080", nil); err != nil {
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fmt.Println("Error starting server")
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os.Exit(1)
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}
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}
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func handlePost() PageData {
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current := time.Now().Unix()
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var day int64 = 60 * 60 * 24
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next := current + day
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// If there is no file, create one
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if _, err := os.Stat("./data/taken.json"); os.IsNotExist(err) {
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if _, err := os.Create("./data/taken.json"); err != nil {
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// Check if file exists, if not create it, and write empty json
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if _, err := os.Stat(DataStore); os.IsNotExist(err) {
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if _, err := os.Create(DataStore); err != nil {
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fmt.Println("Error creating file, check permissions")
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os.Exit(1)
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}
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}
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// Write to file
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if file, err := os.OpenFile("./data/taken.json", os.O_RDWR, os.ModePerm); err != nil {
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if file, err := os.OpenFile(DataStore, os.O_RDWR, os.ModePerm); err != nil {
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fmt.Println("Error opening file, check permissions")
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os.Exit(1)
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} else {
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encoder := json.NewEncoder(file)
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if err = encoder.Encode(Timestamp{current, next}); err != nil {
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store := Store{
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Username: Username,
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Timestamps: []Timestamp{},
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}
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if err = encoder.Encode(store); err != nil {
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fmt.Println("Error encoding file")
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os.Exit(1)
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}
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@ -81,68 +94,191 @@ func handlePost() PageData {
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os.Exit(1)
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}
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}
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}
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return PageData{
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Title: "Form submitted",
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ShowForm: false,
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Message: "Form submitted",
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// Start server
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http.HandleFunc("/", index)
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http.HandleFunc("/post", post)
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http.HandleFunc("/login", login)
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http.HandleFunc("/logout", logout)
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if err := http.ListenAndServe(":8080", nil); err != nil {
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fmt.Println("Error starting server")
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os.Exit(1)
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}
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}
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func checkFile() PageData {
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// Check if file exists
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file, err := os.Open("./data/taken.json")
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if err != nil {
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fmt.Println("Error opening file, check perms or likely does not exist")
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return PageData{
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Title: "Form page",
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Message: "Hello first time user, please enter API key to submit form",
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ShowForm: true,
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}
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}
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// Decode file
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info := Timestamp{}
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func commit(next int64) {
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current := time.Now().Unix()
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// Next is in hours, so convert to seconds
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next = next * 60 * 60
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// Next is the time when the form can be submitted again
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next = current + next
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// Read from file
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if file, err := os.OpenFile(DataStore, os.O_RDWR, os.ModePerm); err != nil {
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fmt.Println("Error opening file, check permissions")
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os.Exit(1)
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} else {
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decoder := json.NewDecoder(file)
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if err := decoder.Decode(&info); err != nil {
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store := Store{}
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if err = decoder.Decode(&store); err != nil {
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fmt.Println("Error decoding file")
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os.Exit(1)
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}
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if err := file.Close(); err != nil {
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store.Timestamps = append(store.Timestamps, Timestamp{current, next})
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if _, err := file.Seek(0, 0); err != nil {
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fmt.Println("Error seeking file")
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os.Exit(1)
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}
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// Write to file
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encoder := json.NewEncoder(file)
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if err = encoder.Encode(store); err != nil {
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fmt.Println("Error encoding file")
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os.Exit(1)
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}
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if err = file.Close(); err != nil {
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fmt.Println("Error closing file")
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}
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if time.Now().Unix() > info.Next {
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return PageData{
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Title: "Form page",
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Message: "Already submmited form today, please wait until tomorrow",
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ShowForm: false,
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os.Exit(1)
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}
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}
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return PageData{
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Title: "Form page",
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Message: "Please enter API key to submit form",
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ShowForm: true,
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}
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func query() bool {
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// Check if file exists
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if file, err := os.Open(DataStore); err != nil {
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fmt.Println("Error opening file, check permissions")
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os.Exit(1)
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} else {
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// Decode file
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decoder := json.NewDecoder(file)
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store := Store{}
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if err = decoder.Decode(&store); err != nil {
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fmt.Println("Error decoding file")
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os.Exit(1)
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}
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if err = file.Close(); err != nil {
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fmt.Println("Error closing file")
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os.Exit(1)
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}
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if len(store.Timestamps) == 0 {
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return true
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}
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// Check if user has already submitted form today
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current := time.Now().Unix()
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// Get last timestamp
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last := store.Timestamps[len(store.Timestamps)-1]
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// If current time is greater than the next time the form can be submitted
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if current > last.Next {
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return true
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}
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}
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return false
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}
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func index(w http.ResponseWriter, r *http.Request) {
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tmpl := template.Must(template.ParseFiles("index.html"))
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var data PageData
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if r.Method == "GET" {
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fmt.Println("GET request received")
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data = checkFile()
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unauthenticated := PageData{
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Title: "Log in",
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Message: "Please enter your username and password",
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ShowLogin: true,
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ShowInput: false,
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}
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if r.Method == "POST" {
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authenticated := PageData{
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Title: "View data",
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Message: "Welcome back " + Username + ". Check in after the timeout",
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ShowLogin: false,
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ShowInput: true,
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}
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// Check for session cookie
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cookie, err := r.Cookie("session")
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if err != nil {
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data = unauthenticated
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} else {
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// Parse cookie to int64
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if session, err := strconv.ParseInt(cookie.Value, 10, 64); err != nil {
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fmt.Println("Error parsing cookie")
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data = unauthenticated
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} else {
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found := false
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for _, uuid := range Authorised {
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if uuid == session {
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found = true
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}
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}
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if found {
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data = authenticated
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} else {
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// If cookie is not in Authorised list, remove it
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data = unauthenticated
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}
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}
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}
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authenticated.ShowInput = query()
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if err := tmpl.Execute(w, data); err != nil {
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http.Error(w, "Error rendering template", http.StatusInternalServerError)
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}
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}
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func post(w http.ResponseWriter, r *http.Request) {
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fmt.Println("POST request received")
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if err := r.ParseForm(); err != nil {
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http.Error(w, "Error parsing form", http.StatusBadRequest)
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return
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}
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if r.Form.Get("key") != os.Getenv("API_KEY") {
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http.Error(w, "Invalid API key", http.StatusUnauthorized)
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next := r.Form.Get("next")
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if next, err := strconv.ParseInt(next, 10, 64); err != nil {
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http.Error(w, "Invalid time", http.StatusBadRequest)
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return
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} else {
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commit(next)
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}
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http.Redirect(w, r, "/", http.StatusSeeOther)
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return
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}
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func login(w http.ResponseWriter, r *http.Request) {
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fmt.Println("LOGIN request received")
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if err := r.ParseForm(); err != nil {
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http.Error(w, "Error parsing form", http.StatusBadRequest)
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return
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}
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data = handlePost()
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username := r.Form.Get("username")
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password := r.Form.Get("password")
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if username != os.Getenv("USERNAME") || password != os.Getenv("PASSWORD") {
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http.Error(w, "Invalid username or password", http.StatusUnauthorized)
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return
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}
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if err := tmpl.Execute(w, data); err != nil {
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http.Error(w, "Error rendering template", http.StatusInternalServerError)
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// Create session cookie
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if session, err := rand.Int(rand.Reader, big.NewInt(math.MaxInt64)); err != nil {
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http.Error(w, "Error creating session", http.StatusInternalServerError)
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return
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} else {
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Authorised = append(Authorised, session.Int64())
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cookie := http.Cookie{
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Name: "session",
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Value: session.String(),
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Expires: time.Now().Add(24 * time.Hour),
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}
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http.SetCookie(w, &cookie)
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http.Redirect(w, r, "/", http.StatusSeeOther)
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return
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}
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}
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func logout(w http.ResponseWriter, r *http.Request) {
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fmt.Println("LOGOUT request received")
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cookie := http.Cookie{
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Name: "session",
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Value: "",
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Expires: time.Now().Add(-1 * time.Hour),
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}
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http.SetCookie(w, &cookie)
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http.Redirect(w, r, "/", http.StatusSeeOther)
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return
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}
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