Initial commit

2020-03-29 10:48:43 +02:00 · 2020-03-29 10:48:43 +02:00 · f4e738b2c7
commit f4e738b2c7
8 changed files with 478 additions and 0 deletions
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,3 @@
+data/
+config/
+.idea/
--- a/13
+++ b/13
@ -0,0 +1,13 @@
+FROM golang:1.14-alpine as build
+RUN apk add --no-cache git gcc musl-dev
+ADD . /app
+WORKDIR /app
+RUN go build
+
+FROM alpine:3.11
+COPY --from=build /app/goshort /bin/
+WORKDIR /app
+VOLUME /app/config
+VOLUME /app/data
+EXPOSE 8080
+CMD ["goshort"]
--- a/21
+++ b/21
@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2020 Jan-Lukas Else
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
--- a/README.md
+++ b/README.md
@ -0,0 +1,5 @@
+# GoShort
+
+## License
+
+GoShort is licensed under the MIT license, so you can do basically everything with it, but nevertheless, please contribute your improvements to make GoShort better for everyone. See the LICENSE file.
--- a/example-config.yaml
+++ b/example-config.yaml
@ -0,0 +1,4 @@
+dbPath: "data/goshort.db"
+password: "password"
+shortUrl: "https://short.example.com"
+defaultUrl: "https://long.example.com"
--- a/go.mod
+++ b/go.mod
@ -0,0 +1,10 @@
+module codeberg.org/jlelse/goshort
+
+go 1.14
+
+require (
+	github.com/gorilla/mux v1.7.4
+	github.com/mattn/go-sqlite3 v2.0.3+incompatible
+	github.com/rubenv/sql-migrate v0.0.0-20200212082348-64f95ea68aa3
+	github.com/spf13/viper v1.6.2
+)
--- a/go.sum
+++ b/go.sum
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+gopkg.in/yaml.v2 v2.2.5 h1:ymVxjfMaHvXD8RqPRmzHHsB3VvucivSkIAvJFDI5O3c=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
--- a/main.go
+++ b/main.go
@ -0,0 +1,181 @@
+package main
+
+import (
+	"database/sql"
+	"github.com/gorilla/mux"
+	_ "github.com/mattn/go-sqlite3"
+	"github.com/rubenv/sql-migrate"
+	"github.com/spf13/viper"
+	"log"
+	"math/rand"
+	"net/http"
+	"net/url"
+	"time"
+)
+
+var db *sql.DB
+
+func main() {
+	rand.Seed(time.Now().UTC().UnixNano())
+
+	viper.SetDefault("dbPath", "data/goshort.db")
+
+	viper.SetConfigName("config")
+	viper.AddConfigPath("./config")
+	viper.AddConfigPath(".")
+	_ = viper.ReadInConfig()
+
+	if !viper.IsSet("dbPath") {
+		log.Fatal("No database path (dbPath) is configured.")
+	}
+	if !viper.IsSet("password") {
+		log.Fatal("No password (password) is configured.")
+	}
+	if !viper.IsSet("shortUrl") {
+		log.Fatal("No short URL (shortUrl) is configured.")
+	}
+	if !viper.IsSet("defaultUrl") {
+		log.Fatal("No default URL (defaultUrl) is configured.")
+	}
+
+	var err error
+	db, err = sql.Open("sqlite3", viper.GetString("dbPath"))
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	MigrateDatabase()
+
+	defer func() {
+		_ = db.Close()
+	}()
+
+	r := mux.NewRouter()
+	r.HandleFunc("/s", ShortenHandler)
+	r.HandleFunc("/{slug}", ShortenedUrlHandler)
+	r.HandleFunc("/", CatchAllHandler)
+
+	http.Handle("/", r)
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}
+
+func MigrateDatabase() {
+	migrations := &migrate.MemoryMigrationSource{
+		Migrations: []*migrate.Migration{
+			{
+				Id:   "001",
+				Up:   []string{"create table redirect(slug text not null primary key,url text not null,hits integer default 0 not null);insert into redirect (slug, url) values ('source', 'https://codeberg.org/jlelse/GoShort');"},
+				Down: []string{"drop table redirect;"},
+			},
+		},
+	}
+	_, err := migrate.Exec(db, "sqlite3", migrations, migrate.Up)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+func ShortenHandler(w http.ResponseWriter, r *http.Request) {
+	writeShortenedUrl := func(w http.ResponseWriter, slug string) {
+		shortenedUrl, err := url.Parse(viper.GetString("shortUrl"))
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		shortenedUrl.Path = slug
+		_, _ = w.Write([]byte(shortenedUrl.String()))
+	}
+
+	password := r.URL.Query().Get("password")
+	if password != viper.GetString("password") {
+		http.Error(w, "Wrong password", http.StatusBadRequest)
+		return
+	}
+
+	requestUrl := r.URL.Query().Get("url")
+	if requestUrl == "" {
+		http.Error(w, "url parameter not set", http.StatusBadRequest)
+		return
+	}
+
+	var slug string
+	err := db.QueryRow("SELECT slug FROM redirect WHERE url = ?", requestUrl).Scan(&slug)
+	if err == nil {
+		writeShortenedUrl(w, slug)
+		return
+	}
+
+	var exists = true
+	for exists == true {
+		slug = generateSlug()
+		err, exists = slugExists(slug)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+	}
+
+	stmt, err := db.Prepare("INSERT INTO redirect (slug, url, hits) VALUES (?, ?, ?)")
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	_, err = stmt.Exec(slug, requestUrl, 0)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.WriteHeader(http.StatusCreated)
+	writeShortenedUrl(w, slug)
+}
+
+func generateSlug() string {
+	var chars = []rune("0123456789abcdefghijklmnopqrstuvwxyz")
+	s := make([]rune, 6)
+	for i := range s {
+		s[i] = chars[rand.Intn(len(chars))]
+	}
+	return string(s)
+}
+
+func slugExists(slug string) (e error, exists bool) {
+	err := db.QueryRow("SELECT EXISTS(SELECT * FROM redirect WHERE slug = ?)", slug).Scan(&exists)
+	if err != nil {
+		return err, false
+	}
+
+	return nil, exists
+}
+
+func ShortenedUrlHandler(w http.ResponseWriter, r *http.Request) {
+	slug, ok := mux.Vars(r)["slug"]
+	if !ok {
+		CatchAllHandler(w, r)
+		return
+	}
+
+	var redirectUrl string
+	err := db.QueryRow("SELECT url FROM redirect WHERE slug = ?", slug).Scan(&redirectUrl)
+	if err != nil {
+		http.NotFound(w, r)
+		return
+	}
+
+	stmt, err := db.Prepare("UPDATE redirect SET hits = hits + 1 WHERE slug = ?")
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	_, err = stmt.Exec(slug)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	http.Redirect(w, r, redirectUrl, http.StatusTemporaryRedirect)
+}
+
+func CatchAllHandler(w http.ResponseWriter, r *http.Request) {
+	http.Redirect(w, r, viper.GetString("defaultUrl"), http.StatusTemporaryRedirect)
+}