25/done - tricky

25.go

@@ -0,0 +1,106 @@
+package main
+
+import (
+    "fmt"
+    "os"
+    "io/ioutil"
+    "net/http"
+    "strings"
+    "regexp"
+    "time"
+)
+
+func main() {
+
+    URL := "https://challenges.aquaq.co.uk/challenge/25/input.txt"
+    line := strings.TrimSpace(string(getbody(URL)))
+    timestamps := strings.Split(line, "\n")
+    format := "15:04:05.000"
+
+    diffs := [][]time.Duration{}
+    temp := []time.Duration{}
+    for i := 1; i < len(timestamps); i++ {
+        prev, err := time.Parse(format, timestamps[i - 1])
+        if err != nil {
+            continue
+        }
+        curr, err := time.Parse(format, timestamps[i])
+        if err != nil {
+            diffs = append(diffs, temp)
+            temp = []time.Duration{  }
+            continue
+        }
+        diff := curr.Sub(prev)
+        temp = append(temp, diff)
+    }
+
+    URL = "https://challenges.aquaq.co.uk/challenge/25"
+    re := regexp.MustCompile(`(?s)<pre>(.*?)</pre></div>`)
+    line = re.FindAllStringSubmatch( string(getbody(URL)), -1 )[0][1]
+    lines := strings.Split(strings.TrimSpace(line), "<br>")
+    morse := make(map[string]string)
+    for _, line := range lines {
+        pair := strings.Split(line, "| ")
+        morse[pair[1]] = pair[0]
+    }
+    test_cipher := ".--- .- --   -.. --- -. ..- -"
+    fmt.Println("test/", YELL(dcode( morse, test_cipher )))
+
+    // soln
+    res := ""
+    for _, diff := range diffs {
+        unit_size := diff[0]
+        morsechar := ""
+        for i := 1; i < len(diff); i++ { if unit_size > diff[i] { unit_size = diff[i] }}
+        for i, duration := range diff {
+            size := int((duration / unit_size))// / time.Nanosecond)
+            if i % 2 == 0 { // btw on and off
+                if size == 3 { morsechar += "-" }
+                if size == 1 { morsechar += "." }
+            } else if size == 3 || size == 7 { // btw off and the next on
+                res += morse[morsechar]
+                morsechar = ""
+                if size == 7 { res += " " }
+            }
+        }
+        if morsechar != "" { res += morse[morsechar] }
+        res += "\n"
+        fmt.Println(CYAN("res/add"), res)
+    }
+    fmt.Println(YELL("res/"), res)
+}
+
+func dcode (morse map[string]string, cipher string) string {
+    res := ""
+    slc := strings.Split(strings.Replace(cipher, "   ", "  ", -1), " ")
+    for _, key := range slc {
+        if key == "" {
+            res += " "
+        } else {
+            res += morse[key]
+        }
+    }
+    return res
+}
+
+func getbody(URL string) []uint8 {
+    session_value := os.Getenv("COOK")
+    if session_value == "" {
+        panic("session/empty")
+    }
+    conn := &http.Client {}
+    req, _ := http.NewRequest("GET", URL, nil)
+    session := &http.Cookie {
+        Name:   "session",
+        Value:  session_value,
+    }
+    req.AddCookie( session )
+    resp, _ := conn.Do(req)
+    defer resp.Body.Close()
+    body, _ := ioutil.ReadAll(resp.Body)
+    return body
+}
+
+const Yell, Cyan, Rest string = "\033[33m", "\033[36m", "\033[0m"
+func YELL(s string)string{ return Yell + s + Rest }
+func CYAN(s string)string{ return Cyan + s + Rest }