From ad9b9c0f7bd4d95ddc54462970d33d92bab9392c Mon Sep 17 00:00:00 2001
From: Julien Dessaux
Date: Fri, 22 Oct 2021 17:59:44 +0200
Subject: Added a functionning url shortening service

---
 src/short.nim | 115 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 src/short.nim

(limited to 'src/short.nim')

diff --git a/src/short.nim b/src/short.nim
new file mode 100644
index 0000000..959e5a7
--- /dev/null
+++ b/src/short.nim
@@ -0,0 +1,115 @@
+import os, strutils
+import std/[hashes, oids, re, times, uri]
+
+import tiny_sqlite
+import jester
+import nimja/parser
+
+import database
+
+const allCss = staticRead("../static/all.css")
+const cssRoute = "/static/all.css." & $hash(allCss)
+const favicon = staticRead("../static/favicon.ico")
+
+var db {.threadvar.}: DbConn
+
+proc initDB() {.raises: [SqliteError].}=
+  if not db.isOpen():
+    db = openDatabase("short.db")
+    if not db.Migrate():
+      echo "Failed to migrate database schema"
+      quit 1
+
+func renderIndex(): string {.raises: [].} =
+  var req: ShortUrl
+  compileTemplateFile(getScriptDir() / "templates/index.html")
+
+func renderShort(req: ShortUrl): string {.raises: [].} =
+  compileTemplateFile(getScriptDir() / "templates/short.html")
+
+func renderNoShort(req: ShortUrl): string {.raises: [].} =
+  compileTemplateFile(getScriptDir() / "templates/noshort.html")
+
+func renderError(code: int, msg: string): string {.raises: [].} =
+  compileTemplateFile(getScriptDir() / "templates/error.html")
+
+proc handleToken(token:string): (HttpCode, string) {.raises: [].} =
+  try:
+    let tokenRegexp = re"^[\w]{24}$"
+    if not match(token, tokenRegexp):
+      return (Http400, renderError(400, "Bad Request"))
+  except RegexError:
+    return (Http500, renderError(500, "RegexError"))
+  db.CleanExpired()
+  try:
+    let req = db.GetUrl(token)
+    if req == nil:
+      return (Http404, renderNoShort(req[]))
+    return (Http200, renderShort(req[]))
+  except SqliteError:
+    return (Http500, renderError(500, "SqliteError"))
+
+proc handleIndexPost(params: Table[string, string]): (HttpCode, string) {.raises: [].} =
+  var input: ShortUrl
+  var exp: int
+  for k, v in params.pairs:
+    case k:
+      of "title":
+        try:
+          let titleRegexp = re"^[\w\s]{3,64}$"
+          if match(v, titleRegexp):
+            input.Title = v
+          else:
+            echo "title"
+            return (Http400, renderError(400, "Bad Request"))
+        except RegexError:
+          return (Http500, renderError(500, "RegexError"))
+      of "url":
+        try:
+          discard parseUri(v)
+          input.Url = v
+        except:
+          echo "url"
+          return (Http400, renderError(400, "Bad Request"))
+      of "expires":
+        try:
+          exp = parseInt(v)
+        except ValueError:
+          return (Http400, renderError(400, "Bad Request"))
+        if exp < 1 or exp > 527040:
+          echo "exp"
+          return (Http400, renderError(400, "Bad Request"))
+      of "shorten": discard
+      else: return (Http400, renderError(400, "Bad Request"))
+  if input.Title == "" or input.Url == "" or exp == 0:
+    echo "empty"
+    return (Http400, renderError(400, "Bad Request"))
+  input.Token = $genOid()
+  input.Created = times.now()
+  input.Expires = input.Created + initDuration(minutes=exp)
+  try:
+    db.AddUrl(input)
+  except SqliteError:
+    return (Http500, renderShort(input))
+  return (Http200, input.Token)
+
+routes:
+  get "/":
+    resp renderIndex()
+  post "/":
+    initDB()
+    var (code, content) = handleIndexPost(request.params)
+    if code != Http200:
+      resp code, content
+    else:
+      redirect("/" & content)
+  get "/static/favicon.ico":
+    resp Http200, {"content-type": "image/x-icon"}, favicon
+  get re"^/static/all\.css\.":
+    resp Http200, {"content-type": "text/css"}, allcss
+  get "/@token":
+    initDB()
+    var (code, content) = handleToken(@"token")
+    resp code, content
+
+runForever()
-- 
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