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main.go
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package main
import (
"context"
"encoding/json"
"fmt"
"html/template"
"io/ioutil"
"log"
"os"
"path"
"strings"
"github.com/valyala/fasthttp"
"github.com/aws/aws-sdk-go/aws"
"github.com/aws/aws-sdk-go/aws/session"
"github.com/aws/aws-sdk-go/service/s3"
"github.com/aws/aws-sdk-go/aws/credentials"
"github.com/joho/godotenv"
"go.mongodb.org/mongo-driver/bson"
"go.mongodb.org/mongo-driver/bson/primitive"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/mongo/options"
)
type OEmbedResponse struct {
Version string `json:"version"`
Type string `json:"type"`
Title string `json:"title"`
Author string `json:"author_name"`
}
type Response struct {
Success bool `json:"success"`
Error string `json:"error"`
}
var (
shortenerCol *mongo.Collection
collection *mongo.Collection
invisibleURL *mongo.Collection
mongoContext = context.TODO()
svc *s3.S3
)
const (
embedTemplate = `<html>
<head>
<title>{{.User}} on higure.wtf</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<meta http-equiv="x-ua-compatible" content="ie=edge">
{{ if .Image }}
<meta name="twitter:card" content="summary_large_image" />
<meta property="og:image" content="{{.FileURL}}" />
<meta property="og:description" content="{{.Desc}}" />
{{ else }}
<meta name="twitter:card" content="player" />
<meta name="twitter:player" content="{{.FileURL}}">
{{ end }}
<meta name="theme-color" content="{{.Color}}" />
<link type="application/json+oembed" href="{{.OEmbedURL}}" />
<link rel="stylesheet" href="https://cdn.higure.wtf/higure/cdn.css">
</head>
<body>
<center>
<div class="vertical-center">
{{ if .Image }}
<img style="-webkit-user-select: none;margin: auto;box-shadow: 0 0 5px rgb(0, 0, 0, 0.5);" src="{{.FileURL}}" />
{{ else if .Video }}
<video style="-webkit-user-select: none;margin: auto;box-shadow: 0 0 5px rgb(0, 0, 0, 0.5);" controls autoplay>
<source src="{{ .FileURL }}">
Your browser does not support this video tag.
</video>
{{ else }}
<h3>
{{ .Name }}
(<span class="info">{{ .Size }}</span>)
</h3>
<button onclick="window.location.href = '{{ .FileURL }}'" style="
appearance: none;
background: white;
padding: 10px;
border: none;
border-radius: 50px;
font-size: .9rem;
cursor: pointer;
">Download</button>
{{ end }}
<h5>Uploaded by: <span class="info">{{.User}}</span></h5>
</div>
</center>
</body>
</html>`
showLinkTemplate = `<html>
<head>
<meta name="twitter:card" content="summary_large_image" />
<meta property="og:image" content="{{.FileURL}}" />
</head>
<body style="margin: 0px; background: #212121; height: 100%; display: flex; align-items: center">
<img width="500px" style="-webkit-user-select: none;margin: auto;" src="{{.FileURL}}" />
</body>
</html>`
)
func main() {
err := godotenv.Load()
if err != nil {
log.Fatal(err)
}
connectToS3(os.Getenv("S3_ENDPOINT"))
connectToDatabase(os.Getenv("MONGO_URI"))
handler := fasthttp.CompressHandler(requestHandler)
if err := fasthttp.ListenAndServe(":"+os.Getenv("PORT"), handler); err != nil {
log.Fatal(err)
}
defer log.Printf("Listening to port %s", os.Getenv("PORT"))
}
func requestHandler(ctx *fasthttp.RequestCtx) {
requestPath := string(ctx.Path())
basePath := path.Base(requestPath)
host := string(ctx.Host())
switch {
case requestPath == "/":
ctx.Redirect("https://higure.wtf", 301)
case strings.HasSuffix(basePath, ".json"):
requestPath = strings.SplitN(basePath, ".json", 2)[0]
var file bson.M
if err := collection.FindOne(mongoContext, bson.M{"filename": requestPath}).Decode(&file); err != nil {
sendErr(ctx, "invalid file")
ctx.Done()
return
}
embed := file["embed"].(primitive.M)
embed["title"] = strings.ReplaceAll(embed["title"].(string), "{domain}", host)
embed["author"] = strings.ReplaceAll(embed["author"].(string), "{domain}", host)
ctx.Response.Header.SetCanonical([]byte("Content-Type"), []byte("application/json"))
if err := json.NewEncoder(ctx).Encode(OEmbedResponse{
Type: "link",
Version: "1.0",
Title: embed["title"].(string),
Author: embed["author"].(string),
}); err != nil {
log.Fatal(err)
}
case strings.HasPrefix(requestPath, "/s/") && basePath != "s":
var shortened bson.M
if err := shortenerCol.FindOne(mongoContext, bson.M{"shortId": basePath}).Decode(&shortened); err != nil {
sendErr(ctx, "invalid short link")
ctx.Done()
return
}
destination := shortened["destination"].(string)
if !strings.HasPrefix(destination, "http") {
destination = "https://" + shortened["destination"].(string)
}
ctx.Redirect(destination, 301)
ctx.Done()
case basePath != "" && basePath != "favicon.ico":
var file bson.M
if strings.HasSuffix(basePath, "\u200B") {
if err := invisibleURL.FindOne(mongoContext, bson.M{"_id": basePath}).Decode(&file); err != nil {
sendErr(ctx, "no invisible url or file was found")
ctx.Done()
return
}
if file != nil {
if err := collection.FindOne(mongoContext, bson.M{"filename": file["filename"]}).Decode(&file); err != nil {
sendErr(ctx, "invalid file")
ctx.Done()
return
}
}
} else {
if err := collection.FindOne(mongoContext, bson.M{"filename": basePath}).Decode(&file); err != nil {
sendErr(ctx, "invalid file")
ctx.Done()
return
}
}
if file["userOnlyDomain"] == true && host != file["domain"].(string) {
sendErr(ctx, "invalid file")
ctx.Done()
return
}
resp, err := svc.GetObject(&s3.GetObjectInput{
Bucket: aws.String(os.Getenv("S3_BUCKET_NAME")),
Key: aws.String(file["key"].(string)),
})
if err != nil {
sendErr(ctx, err.Error())
ctx.Done()
return
}
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
sendErr(ctx, err.Error())
ctx.Done()
return
}
mimetype := strings.SplitN(file["mimetype"].(string), "/", 2)[0]
cdnURL := os.Getenv("S3_ENDPOINT") + "/" + os.Getenv("S3_BUCKET_NAME") + "/" + file["key"].(string)
embed := file["embed"].(primitive.M)
uploader := file["uploader"].(primitive.M)
embed["description"] = strings.ReplaceAll(embed["description"].(string), "{domain}", host)
if embed["enabled"] == true {
t, err := template.New("embed").Parse(embedTemplate)
if err != nil {
sendErr(ctx, err.Error())
ctx.Done()
return
}
data := struct {
FileURL string
OEmbedURL string
Desc string
Color string
Image bool
Video bool
User string
Size string
Name string
}{
FileURL: cdnURL,
OEmbedURL: "https://" + host + "/" + file["filename"].(string) + ".json",
Desc: embed["description"].(string),
Color: embed["color"].(string),
Image: mimetype == "image",
User: uploader["username"].(string),
Name: file["filename"].(string),
Size: file["size"].(string),
Video: mimetype == "video",
}
ctx.SetContentType("text/html")
err = t.Execute(ctx, data)
if err != nil {
sendErr(ctx, err.Error())
ctx.Done()
}
} else if file["showLink"] == true {
if mimetype == "video" {
ctx.SetContentType(deref(resp.ContentType))
ctx.SetBody(body)
ctx.Done()
} else {
t, err := template.New("showLink").Parse(showLinkTemplate)
if err != nil {
sendErr(ctx, err.Error())
ctx.Done()
return
}
data := struct {
FileURL string
}{
FileURL: cdnURL,
}
ctx.SetContentType("text/html")
err = t.Execute(ctx, data)
if err != nil {
sendErr(ctx, err.Error())
ctx.Done()
}
}
} else {
ctx.SetContentType(deref(resp.ContentType))
ctx.SetBody(body)
ctx.Done()
}
}
}
func sendErr(ctx *fasthttp.RequestCtx, errMsg string) {
ctx.Response.Header.SetCanonical([]byte("Content-Type"), []byte("application/json"))
if err := json.NewEncoder(ctx).Encode(Response{Success: false, Error: errMsg}); err != nil {
log.Fatal(err)
}
}
func connectToS3(endpoint string) {
s3Config := &aws.Config{
Credentials: credentials.NewStaticCredentials(os.Getenv("AWS_ACCESS_KEY_ID"), os.Getenv("AWS_SECRET_ACCESS_KEY"), ""),
Endpoint: aws.String(endpoint),
Region: aws.String("us-east-1"),
DisableSSL: aws.Bool(true),
S3ForcePathStyle: aws.Bool(true),
}
newSession := session.New(s3Config)
svc = s3.New(newSession)
defer fmt.Println("Connected to S3")
}
func connectToDatabase(mongoURL string) {
client, err := mongo.Connect(mongoContext, options.Client().ApplyURI(mongoURL))
if err != nil {
log.Fatal(err)
}
database := client.Database("higure")
collection = database.Collection("files")
shortenerCol = database.Collection("shorteners")
invisibleURL = database.Collection("invisibleurls")
defer fmt.Println("Connected to MongoDB cluster")
}
func deref(str *string) string {
if str != nil {
return *str
}
return ""
}