Merge pull request #331 from zuh0/official-docker-buildx-ghaction

ci: switch to official docker buildx GitHub action

.github/workflows/build-docker-images.yml

@@ -0,0 +1,89 @@
+name: Deploy multi-architecture Docker images for transfer.sh with buildx
+
+on:
+  schedule:
+    - cron: '0 0 * * *' # everyday at midnight UTC
+  pull_request:
+    branches: master
+  push:
+    branches: master
+    tags:
+      - v*
+
+jobs:
+  buildx:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v2
+      -
+        name: Prepare
+        id: prepare
+        run: |
+          DOCKER_IMAGE=dutchcoders/transfer.sh
+          DOCKER_PLATFORMS=linux/amd64,linux/arm/v7,linux/arm64,linux/386
+          VERSION=edge
+
+          if [[ $GITHUB_REF == refs/tags/* ]]; then
+            VERSION=${GITHUB_REF#refs/tags/v}
+          fi
+
+          if [ "${{ github.event_name }}" = "schedule" ]; then
+            VERSION=nightly
+          fi
+
+          TAGS="--tag ${DOCKER_IMAGE}:${VERSION}"
+
+          if [ $VERSION = edge -o $VERSION = nightly ]; then
+            TAGS="$TAGS --tag ${DOCKER_IMAGE}:latest"
+          fi
+
+          echo ::set-output name=docker_image::${DOCKER_IMAGE}
+          echo ::set-output name=version::${VERSION}
+          echo ::set-output name=buildx_args::--platform ${DOCKER_PLATFORMS} \
+            --build-arg VERSION=${VERSION} \
+            --build-arg BUILD_DATE=$(date -u +'%Y-%m-%dT%H:%M:%SZ') \
+            --build-arg VCS_REF=${GITHUB_SHA::8} \
+            ${TAGS} .
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+        with:
+          platforms: all
+      -
+        name: Set up Docker Buildx
+        id: buildx
+        uses: docker/setup-buildx-action@v1
+        with:
+          version: latest
+      -
+        name: Available platforms
+        run: echo ${{ steps.buildx.outputs.platforms }}
+      -
+        name: Docker Buildx (build)
+        run: |
+          docker buildx build --no-cache --pull --output "type=image,push=false" ${{ steps.prepare.outputs.buildx_args }}
+      -
+        name: Docker Login
+        if: success() && github.event_name != 'pull_request'
+        env:
+          DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
+          DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
+        run: |
+          echo "${DOCKER_PASSWORD}" | docker login --username "${DOCKER_USERNAME}" --password-stdin
+      -
+        name: Docker Buildx (push)
+        if: success() && github.event_name != 'pull_request'
+        run: |
+          docker buildx build --output "type=image,push=true" ${{ steps.prepare.outputs.buildx_args }}
+      -
+        name: Docker Check Manifest
+        if: always() && github.event_name != 'pull_request'
+        run: |
+          docker run --rm mplatform/mquery ${{ steps.prepare.outputs.docker_image }}:${{ steps.prepare.outputs.version }}
+      -
+        name: Clear
+        if: always() && github.event_name != 'pull_request'
+        run: |
+          rm -f ${HOME}/.docker/config.json

Dockerfile

@@ -12,7 +12,7 @@ WORKDIR /go/src/github.com/dutchcoders/transfer.sh
 ENV GO111MODULE=on
 
 # build & install server
-RUN go get -u ./... && CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -ldflags -a -tags netgo -ldflags '-w -extldflags "-static"' -o /go/bin/transfersh github.com/dutchcoders/transfer.sh
+RUN go get -u ./... && CGO_ENABLED=0 go build -ldflags -a -tags netgo -ldflags '-w -extldflags "-static"' -o /go/bin/transfersh github.com/dutchcoders/transfer.sh
 
 FROM scratch AS final
 LABEL maintainer="Andrea Spacca <andrea.spacca@gmail.com>"

README.md

@@ -76,40 +76,44 @@ https://transfer.sh/1lDau/test.txt --> https://transfer.sh/inline/1lDau/test.txt
 
 Parameter | Description | Value | Env
 --- | --- | --- | ---
-listener | port to use for http (:80) | |
+listener | port to use for http (:80) | | LISTENER |
-profile-listener | port to use for profiler (:6060)| |
+profile-listener | port to use for profiler (:6060) | | PROFILE_LISTENER |
-force-https | redirect to https | false |
+force-https | redirect to https | false | FORCE_HTTPS
-tls-listener | port to use for https (:443) | |
+tls-listener | port to use for https (:443) | | TLS_LISTENER |
-tls-listener-only | flag to enable tls listener only | |
+tls-listener-only | flag to enable tls listener only | | TLS_LISTENER_ONLY |
-tls-cert-file | path to tls certificate | |
+tls-cert-file | path to tls certificate | | TLS_CERT_FILE |
-tls-private-key | path to tls private key | |
+tls-private-key | path to tls private key | | TLS_PRIVATE_KEY |
-http-auth-user | user for basic http auth on upload | |
+http-auth-user | user for basic http auth on upload | | HTTP_AUTH_USER |
-http-auth-pass | pass for basic http auth on upload | |
+http-auth-pass | pass for basic http auth on upload | | HTTP_AUTH_PASS |
-ip-whitelist | comma separated list of ips allowed to connect to the service | |
+ip-whitelist | comma separated list of ips allowed to connect to the service | | IP_WHITELIST |
-ip-blacklist | comma separated list of ips not allowed to connect to the service | |
+ip-blacklist | comma separated list of ips not allowed to connect to the service | | IP_BLACKLIST |
-temp-path | path to temp folder | system temp |
+temp-path | path to temp folder | system temp | TEMP_PATH |
-web-path | path to static web files (for development or custom front end) | |
+web-path | path to static web files (for development or custom front end) | | WEB_PATH |
-proxy-path | path prefix when service is run behind a proxy | |
+proxy-path | path prefix when service is run behind a proxy | | PROXY_PATH |
-ga-key | google analytics key for the front end | |
+proxy-port | port of the proxy when the service is run behind a proxy | | PROXY_PORT |
-uservoice-key | user voice key for the front end  | |
+ga-key | google analytics key for the front end | | GA_KEY |
-provider | which storage provider to use | (s3, gdrive or local) |
+uservoice-key | user voice key for the front end  | | USERVOICE_KEY |
-aws-access-key | aws access key | | AWS_ACCESS_KEY
+provider | which storage provider to use | (s3, gdrive or local) | PROVIDER |
-aws-secret-key | aws access key | | AWS_SECRET_KEY
+aws-access-key | aws access key | | AWS_ACCESS_KEY |
-bucket | aws bucket | | BUCKET
+aws-secret-key | aws access key | | AWS_SECRET_KEY |
-s3-endpoint | Custom S3 endpoint. | |
+bucket | aws bucket | | BUCKET |
-s3-region | region of the s3 bucket | eu-west-1 | S3_REGION
+s3-endpoint | Custom S3 endpoint. | | S3_ENDPOINT |
-s3-no-multipart | disables s3 multipart upload | false | |
+s3-region | region of the s3 bucket | eu-west-1 | S3_REGION |
-s3-path-style | Forces path style URLs, required for Minio. | false | |
+s3-no-multipart | disables s3 multipart upload | false | S3_NO_MULTIPART |
-basedir | path storage for local/gdrive provider| |
+s3-path-style | Forces path style URLs, required for Minio. | false | S3_PATH_STYLE |
-gdrive-client-json-filepath | path to oauth client json config for gdrive provider| |
+basedir | path storage for local/gdrive provider | | BASEDIR |
-gdrive-local-config-path | path to store local transfer.sh config cache for gdrive provider| |
+gdrive-client-json-filepath | path to oauth client json config for gdrive provider | | GDRIVE_CLIENT_JSON_FILEPATH |
-gdrive-chunk-size | chunk size for gdrive upload in megabytes, must be lower than available memory (8 MB) | |
+gdrive-local-config-path | path to store local transfer.sh config cache for gdrive provider| | GDRIVE_LOCAL_CONFIG_PATH |
-lets-encrypt-hosts | hosts to use for lets encrypt certificates (comma seperated) | |
+gdrive-chunk-size | chunk size for gdrive upload in megabytes, must be lower than available memory (8 MB) | | GDRIVE_CHUNK_SIZE |
-log | path to log file| |
+lets-encrypt-hosts | hosts to use for lets encrypt certificates (comma seperated) | | HOSTS |
+log | path to log file| | LOG |
+cors-domains | comma separated list of domains for CORS, setting it enable CORS | | CORS_DOMAINS |
+clamav-host | host for clamav feature  | | CLAMAV_HOST |
+rate-limit | request per minute  | | RATE_LIMIT |
 
 If you want to use TLS using lets encrypt certificates, set lets-encrypt-hosts to your domain, set tls-listener to :443 and enable force-https.
 
-If you want to use TLS using your own certificates, set tls-listener to :443, force-https, tls-cert=file and tls-private-key.
+If you want to use TLS using your own certificates, set tls-listener to :443, force-https, tls-cert-file and tls-private-key.
 
 ## Development
 

cmd/cmd.go

@@ -12,7 +12,7 @@ import (
 	"google.golang.org/api/googleapi"
 )
 
-var Version = "1.1.4"
+var Version = "1.1.7"
 var helpTemplate = `NAME:
 {{.Name}} - {{.Usage}}
 
@@ -37,6 +37,7 @@ var globalFlags = []cli.Flag{
 		Name:  "listener",
 		Usage: "127.0.0.1:8080",
 		Value: "127.0.0.1:8080",
+		EnvVar: "LISTENER",
 	},
 	// redirect to https?
 	// hostnames
@@ -44,57 +45,75 @@ var globalFlags = []cli.Flag{
 		Name:  "profile-listener",
 		Usage: "127.0.0.1:6060",
 		Value: "",
+		EnvVar: "PROFILE_LISTENER",
 	},
 	cli.BoolFlag{
 		Name:  "force-https",
 		Usage: "",
+		EnvVar: "FORCE_HTTPS",
 	},
 	cli.StringFlag{
 		Name:  "tls-listener",
 		Usage: "127.0.0.1:8443",
 		Value: "",
+		EnvVar: "TLS_LISTENER",
 	},
 	cli.BoolFlag{
 		Name:  "tls-listener-only",
 		Usage: "",
+		EnvVar: "TLS_LISTENER_ONLY",
 	},
 	cli.StringFlag{
 		Name:  "tls-cert-file",
 		Value: "",
+		EnvVar: "TLS_CERT_FILE",
 	},
 	cli.StringFlag{
 		Name:  "tls-private-key",
 		Value: "",
+		EnvVar: "TLS_PRIVATE_KEY",
 	},
 	cli.StringFlag{
 		Name:  "temp-path",
 		Usage: "path to temp files",
 		Value: os.TempDir(),
+		EnvVar: "TEMP_PATH",
 	},
 	cli.StringFlag{
 		Name:  "web-path",
 		Usage: "path to static web files",
 		Value: "",
+		EnvVar: "WEB_PATH",
 	},
 	cli.StringFlag{
 		Name:  "proxy-path",
 		Usage: "path prefix when service is run behind a proxy",
 		Value: "",
+		EnvVar: "PROXY_PATH",
+	},
+	cli.StringFlag{
+		Name:  "proxy-port",
+		Usage: "port of the proxy when the service is run behind a proxy",
+		Value: "",
+		EnvVar: "PROXY_PORT",
 	},
 	cli.StringFlag{
 		Name:  "ga-key",
 		Usage: "key for google analytics (front end)",
 		Value: "",
+		EnvVar: "GA_KEY",
 	},
 	cli.StringFlag{
 		Name:  "uservoice-key",
 		Usage: "key for user voice (front end)",
 		Value: "",
+		EnvVar: "USERVOICE_KEY",
 	},
 	cli.StringFlag{
 		Name:  "provider",
 		Usage: "s3|gdrive|local",
 		Value: "",
+		EnvVar: "PROVIDER",
 	},
 	cli.StringFlag{
 		Name:   "s3-endpoint",
@@ -129,31 +148,36 @@ var globalFlags = []cli.Flag{
 	cli.BoolFlag{
 		Name:  "s3-no-multipart",
 		Usage: "Disables S3 Multipart Puts",
+		EnvVar: "S3_NO_MULTIPART",
 	},
 	cli.BoolFlag{
 		Name:  "s3-path-style",
 		Usage: "Forces path style URLs, required for Minio.",
+		EnvVar: "S3_PATH_STYLE",
 	},
 	cli.StringFlag{
 		Name:  "gdrive-client-json-filepath",
 		Usage: "",
 		Value: "",
+		EnvVar: "GDRIVE_CLIENT_JSON_FILEPATH",
 	},
 	cli.StringFlag{
 		Name:  "gdrive-local-config-path",
 		Usage: "",
 		Value: "",
+		EnvVar: "GDRIVE_LOCAL_CONFIG_PATH",
 	},
 	cli.IntFlag{
 		Name:  "gdrive-chunk-size",
 		Usage: "",
 		Value: googleapi.DefaultUploadChunkSize / 1024 / 1024,
+		EnvVar: "GDRIVE_CHUNK_SIZE",
 	},
 	cli.IntFlag{
 		Name:   "rate-limit",
 		Usage:  "requests per minute",
 		Value:  0,
-		EnvVar: "",
+		EnvVar: "RATE_LIMIT",
 	},
 	cli.StringFlag{
 		Name:   "lets-encrypt-hosts",
@@ -165,11 +189,13 @@ var globalFlags = []cli.Flag{
 		Name:  "log",
 		Usage: "/var/log/transfersh.log",
 		Value: "",
+		EnvVar: "LOG",
 	},
 	cli.StringFlag{
 		Name:  "basedir",
 		Usage: "path to storage",
 		Value: "",
+		EnvVar: "BASEDIR",
 	},
 	cli.StringFlag{
 		Name:   "clamav-host",
@@ -186,26 +212,37 @@ var globalFlags = []cli.Flag{
 	cli.BoolFlag{
 		Name:  "profiler",
 		Usage: "enable profiling",
+		EnvVar: "PROFILER",
 	},
 	cli.StringFlag{
 		Name:  "http-auth-user",
 		Usage: "user for http basic auth",
 		Value: "",
+		EnvVar: "HTTP_AUTH_USER",
 	},
 	cli.StringFlag{
 		Name:  "http-auth-pass",
 		Usage: "pass for http basic auth",
 		Value: "",
+		EnvVar: "HTTP_AUTH_PASS",
 	},
 	cli.StringFlag{
 		Name:  "ip-whitelist",
 		Usage: "comma separated list of ips allowed to connect to the service",
 		Value: "",
+		EnvVar: "IP_WHITELIST",
 	},
 	cli.StringFlag{
 		Name:  "ip-blacklist",
 		Usage: "comma separated list of ips not allowed to connect to the service",
 		Value: "",
+		EnvVar: "IP_BLACKLIST",
+	},
+	cli.StringFlag{
+		Name:  "cors-domains",
+		Usage: "comma separated list of domains allowed for CORS requests",
+		Value: "",
+		EnvVar: "CORS_DOMAINS",
 	},
 }
 
@@ -214,7 +251,7 @@ type Cmd struct {
 }
 
 func VersionAction(c *cli.Context) {
-	fmt.Println(color.YellowString(fmt.Sprintf("transfer.sh: Easy file sharing from the command line")))
+	fmt.Println(color.YellowString(fmt.Sprintf("transfer.sh %s: Easy file sharing from the command line", Version)))
 }
 
 func New() *Cmd {
@@ -245,6 +282,10 @@ func New() *Cmd {
 			options = append(options, server.Listener(v))
 		}
 
+		if v := c.String("cors-domains"); v != "" {
+			options = append(options, server.CorsDomains(v))
+		}
+
 		if v := c.String("tls-listener"); v == "" {
 		} else if c.Bool("tls-listener-only") {
 			options = append(options, server.TLSListener(v, true))
@@ -264,6 +305,10 @@ func New() *Cmd {
 			options = append(options, server.ProxyPath(v))
 		}
 
+		if v := c.String("proxy-port"); v != "" {
+			options = append(options, server.ProxyPort(v))
+		}
+
 		if v := c.String("ga-key"); v != "" {
 			options = append(options, server.GoogleAnalytics(v))
 		}

go.mod

@@ -16,6 +16,7 @@ require (
 	github.com/garyburd/redigo v1.6.0 // indirect
 	github.com/golang/gddo v0.0.0-20200310004957-95ce5a452273
 	github.com/golang/protobuf v1.3.5 // indirect
+	github.com/gorilla/handlers v1.4.2
 	github.com/gorilla/mux v1.7.4
 	github.com/gorilla/securecookie v1.1.1 // indirect
 	github.com/hashicorp/golang-lru v0.5.3 // indirect

go.sum

@@ -127,6 +127,8 @@ github.com/googleapis/gax-go v2.0.0+incompatible/go.mod h1:SFVmujtThgffbyetf+mdk
 github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
 github.com/googleapis/gax-go/v2 v2.0.5 h1:sjZBwGj9Jlw33ImPtvFviGYvseOtDM7hkSKB7+Tv3SM=
 github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5mhpdKc/us6bOk=
+github.com/gorilla/handlers v1.4.2 h1:0QniY0USkHQ1RGCLfKxeNHK9bkDHGRYGNDFBCS+YARg=
+github.com/gorilla/handlers v1.4.2/go.mod h1:Qkdc/uu4tH4g6mTK6auzZ766c4CA0Ng8+o/OAirnOIQ=
 github.com/gorilla/mux v1.7.3 h1:gnP5JzjVOuiZD07fKKToCAOjS0yOpj/qPETTXCCS6hw=
 github.com/gorilla/mux v1.7.3/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
 github.com/gorilla/mux v1.7.4 h1:VuZ8uybHlWmqV03+zRzdwKL4tUnIp1MAQtp1mIFE1bc=

server/handlers.go

@@ -158,9 +158,9 @@ func (s *Server) previewHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	relativeURL, _ := url.Parse(path.Join(s.proxyPath, token, filename))
-	resolvedURL := resolveURL(r, relativeURL)
+	resolvedURL := resolveURL(r, relativeURL, s.proxyPort)
 	relativeURLGet, _ := url.Parse(path.Join(s.proxyPath, getPathPart, token, filename))
-	resolvedURLGet := resolveURL(r, relativeURLGet)
+	resolvedURLGet := resolveURL(r, relativeURLGet, s.proxyPort)
 	var png []byte
 	png, err = qrcode.Encode(resolvedURL, qrcode.High, 150)
 	if err != nil {
@@ -170,8 +170,8 @@ func (s *Server) previewHandler(w http.ResponseWriter, r *http.Request) {
 
 	qrCode := base64.StdEncoding.EncodeToString(png)
 
-	hostname := getURL(r).Host
+	hostname := getURL(r, s.proxyPort).Host
-	webAddress := resolveWebAddress(r, s.proxyPath)
+	webAddress := resolveWebAddress(r, s.proxyPath, s.proxyPort)
 
 	data := struct {
 		ContentType   string
@@ -212,8 +212,8 @@ func (s *Server) previewHandler(w http.ResponseWriter, r *http.Request) {
 func (s *Server) viewHandler(w http.ResponseWriter, r *http.Request) {
 	// vars := mux.Vars(r)
 
-	hostname := getURL(r).Host
+	hostname := getURL(r, s.proxyPort).Host
-	webAddress := resolveWebAddress(r, s.proxyPath)
+	webAddress := resolveWebAddress(r, s.proxyPath, s.proxyPort)
 
 	data := struct {
 		Hostname     string
@@ -339,7 +339,7 @@ func (s *Server) postHandler(w http.ResponseWriter, r *http.Request) {
 
 			filename = url.PathEscape(filename)
 			relativeURL, _ := url.Parse(path.Join(s.proxyPath, token, filename))
-			fmt.Fprintln(w, getURL(r).ResolveReference(relativeURL).String())
+			fmt.Fprintln(w, getURL(r, s.proxyPort).ResolveReference(relativeURL).String())
 
 			cleanTmpFile(file)
 		}
@@ -500,15 +500,15 @@ func (s *Server) putHandler(w http.ResponseWriter, r *http.Request) {
 	relativeURL, _ := url.Parse(path.Join(s.proxyPath, token, filename))
 	deleteURL, _ := url.Parse(path.Join(s.proxyPath, token, filename, metadata.DeletionToken))
 
-	w.Header().Set("X-Url-Delete", resolveURL(r, deleteURL))
+	w.Header().Set("X-Url-Delete", resolveURL(r, deleteURL, s.proxyPort))
 
-	fmt.Fprint(w, resolveURL(r, relativeURL))
+	fmt.Fprint(w, resolveURL(r, relativeURL, s.proxyPort))
 }
 
-func resolveURL(r *http.Request, u *url.URL) string {
+func resolveURL(r *http.Request, u *url.URL, proxyPort string) string {
 	r.URL.Path = ""
 
-	return getURL(r).ResolveReference(u).String()
+	return getURL(r, proxyPort).ResolveReference(u).String()
 }
 
 func resolveKey(key, proxyPath string) string {
@@ -525,8 +525,8 @@ func resolveKey(key, proxyPath string) string {
 	return key
 }
 
-func resolveWebAddress(r *http.Request, proxyPath string) string {
+func resolveWebAddress(r *http.Request, proxyPath string, proxyPort string) string {
-	url := getURL(r)
+	url := getURL(r, proxyPort)
 
 	var webAddress string
 
@@ -544,7 +544,7 @@ func resolveWebAddress(r *http.Request, proxyPath string) string {
 	return webAddress
 }
 
-func getURL(r *http.Request) *url.URL {
+func getURL(r *http.Request, proxyPort string) *url.URL {
 	u, _ := url.Parse(r.URL.String())
 
 	if r.TLS != nil {
@@ -555,9 +555,17 @@ func getURL(r *http.Request) *url.URL {
 		u.Scheme = "http"
 	}
 
-	if u.Host != "" {
+	if u.Host == "" {
-	} else if host, port, err := net.SplitHostPort(r.Host); err != nil {
+		host, port, err := net.SplitHostPort(r.Host)
-		u.Host = r.Host
+		if err != nil {
+			host = r.Host
+			port = ""
+		}
+		if len(proxyPort) != 0 {
+			port = proxyPort
+		}
+		if len(port) == 0 {
+			u.Host = host
 		} else {
 			if port == "80" && u.Scheme == "http" {
 				u.Host = host
@@ -567,6 +575,7 @@ func getURL(r *http.Request) *url.URL {
 				u.Host = net.JoinHostPort(host, port)
 			}
 		}
+	}
 
 	return u
 }
@@ -614,9 +623,7 @@ func (s *Server) CheckMetadata(token, filename string, increaseDownload bool) (M
 	var metadata Metadata
 
 	r, _, err := s.storage.Get(token, fmt.Sprintf("%s.metadata", filename))
-	if s.storage.IsNotExist(err) {
+	if err != nil {
-		return metadata, nil
-	} else if err != nil {
 		return metadata, err
 	}
 
@@ -1011,7 +1018,7 @@ func (s *Server) RedirectHandler(h http.Handler) http.HandlerFunc {
 		} else if r.Header.Get("X-Forwarded-Proto") == "https" {
 		} else if r.URL.Scheme == "https" {
 		} else {
-			u := getURL(r)
+			u := getURL(r, s.proxyPort)
 			u.Scheme = "https"
 
 			http.Redirect(w, r, u.String(), http.StatusPermanentRedirect)

server/server.go

@@ -26,7 +26,10 @@ package server
 
 import (
 	"errors"
+	gorillaHandlers "github.com/gorilla/handlers"
 	"log"
+	crypto_rand "crypto/rand"
+	"encoding/binary"
 	"math/rand"
 	"mime"
 	"net/http"
@@ -85,6 +88,13 @@ func Listener(s string) OptionFn {
 
 }
 
+func CorsDomains(s string) OptionFn {
+	return func(srvr *Server) {
+		srvr.CorsDomains = s
+	}
+
+}
+
 func GoogleAnalytics(gaKey string) OptionFn {
 	return func(srvr *Server) {
 		srvr.gaKey = gaKey
@@ -131,6 +141,12 @@ func ProxyPath(s string) OptionFn {
 	}
 }
 
+func ProxyPort(s string) OptionFn {
+	return func(srvr *Server) {
+		srvr.proxyPort = s
+	}
+}
+
 func TempPath(s string) OptionFn {
 	return func(srvr *Server) {
 		if s[len(s)-1:] != "/" {
@@ -270,11 +286,13 @@ type Server struct {
 
 	webPath      string
 	proxyPath    string
+	proxyPort    string
 	gaKey        string
 	userVoiceKey string
 
 	TLSListenerOnly bool
 
+	CorsDomains           string
 	ListenerString        string
 	TLSListenerString     string
 	ProfileListenerString string
@@ -297,7 +315,11 @@ func New(options ...OptionFn) (*Server, error) {
 }
 
 func init() {
-	rand.Seed(time.Now().UTC().UnixNano())
+	var seedBytes [8]byte
+	if _, err := crypto_rand.Read(seedBytes[:]); err != nil {
+		panic("cannot obtain cryptographically secure seed")
+	}
+	rand.Seed(int64(binary.LittleEndian.Uint64(seedBytes[:])))
 }
 
 func (s *Server) Run() {
@@ -413,11 +435,24 @@ func (s *Server) Run() {
 
 	s.logger.Printf("Transfer.sh server started.\nusing temp folder: %s\nusing storage provider: %s", s.tempPath, s.storage.Type())
 
+	var cors func(http.Handler) http.Handler
+	if len(s.CorsDomains) > 0 {
+		cors = gorillaHandlers.CORS(
+			gorillaHandlers.AllowedHeaders([]string{"*"}),
+			gorillaHandlers.AllowedOrigins(strings.Split(s.CorsDomains, ",")),
+			gorillaHandlers.AllowedMethods([]string{"GET", "HEAD", "POST", "PUT", "DELETE", "OPTIONS"}),
+		)
+	} else {
+		cors = func(h http.Handler) http.Handler {
+			return h
+		}
+	}
+
 	h := handlers.PanicHandler(
 		IPFilterHandler(
 			handlers.LogHandler(
 				LoveHandler(
-					s.RedirectHandler(r)),
+					s.RedirectHandler(cors(r))),
 				handlers.NewLogOptions(s.logger.Printf, "_default_"),
 			),
 			s.ipFilterOptions,