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kind: pipeline
name: default
steps:
- name: docker
image: plugins/docker
settings:
repo: djeeberjr/s3-proxy
username: djeeberjr
password:
from_secret: DOCKER_HUB_TOKEN
trigger:
branch:
- master

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*
!.gitignore
!docker-compose.yml
!Dockerfile
!go.mod
!go.sum
!main.go
!.drone.yml
!LICENCE
!README.md

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FROM golang as gobuild
ADD . /build
WORKDIR /build
RUN go build main.go
FROM gcr.io/distroless/base-debian10
COPY --from=gobuild /build/main /s3-proxy
EXPOSE 3000
CMD [ "/s3-proxy" ]

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GNU GENERAL PUBLIC LICENSE
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<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<http://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<http://www.gnu.org/philosophy/why-not-lgpl.html>.

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A reverse proxy for using S3 buckets as a web server. Behaves like a web server with a filesystem as a backend instaed of a S3 bucket.
# Usage
```
s3-proxy 0.1
Usage: main --s3-endpoint ENDPOINT --s3-bucket BUCKET [--s3-access-key ACCESS_KEY] [--s3-secret-key SECRET_KEY] [--s3-disable-ssl] [--address ADDRESS]
Options:
--s3-endpoint ENDPOINT
host[:port] [env: S3_ENDPOINT]
--s3-bucket BUCKET [env: S3_BUCKET]
--s3-access-key ACCESS_KEY [env: S3_ACCESS_KEY]
--s3-secret-key SECRET_KEY [env: S3_SECRET_KEY]
--s3-disable-ssl [default: false, env: S3_DISABLE_SSL]
--address ADDRESS what address to listen on [default: :3000, env: ADDRESS]
--help, -h display this help and exit
--version display version and exit
```

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version: "3"
services:
s3-proxy:
image: djeeberjr/s3-proxy
build: .
container_name: s3-proxy
environment:
- name=value
ports:
- 3000:3000

27
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module git.kapelle.org/niklas/s3-proxy
go 1.17
require github.com/minio/minio-go/v7 v7.0.20
require (
github.com/alexflint/go-arg v1.4.2 // indirect
github.com/alexflint/go-scalar v1.0.0 // indirect
github.com/dustin/go-humanize v1.0.0 // indirect
github.com/google/uuid v1.1.1 // indirect
github.com/json-iterator/go v1.1.10 // indirect
github.com/klauspost/compress v1.13.5 // indirect
github.com/klauspost/cpuid v1.3.1 // indirect
github.com/minio/md5-simd v1.1.0 // indirect
github.com/minio/sha256-simd v0.1.1 // indirect
github.com/mitchellh/go-homedir v1.1.0 // indirect
github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
github.com/modern-go/reflect2 v1.0.1 // indirect
github.com/rs/xid v1.2.1 // indirect
github.com/sirupsen/logrus v1.8.1 // indirect
golang.org/x/crypto v0.0.0-20201216223049-8b5274cf687f // indirect
golang.org/x/net v0.0.0-20200707034311-ab3426394381 // indirect
golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae // indirect
golang.org/x/text v0.3.3 // indirect
gopkg.in/ini.v1 v1.57.0 // indirect
)

60
go.sum Normal file
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@ -0,0 +1,60 @@
github.com/alexflint/go-arg v1.4.2 h1:lDWZAXxpAnZUq4qwb86p/3rIJJ2Li81EoMbTMujhVa0=
github.com/alexflint/go-arg v1.4.2/go.mod h1:9iRbDxne7LcR/GSvEr7ma++GLpdIU1zrghf2y2768kM=
github.com/alexflint/go-scalar v1.0.0 h1:NGupf1XV/Xb04wXskDFzS0KWOLH632W/EO4fAFi+A70=
github.com/alexflint/go-scalar v1.0.0/go.mod h1:GpHzbCOZXEKMEcygYQ5n/aa4Aq84zbxjy3MxYW0gjYw=
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/dustin/go-humanize v1.0.0 h1:VSnTsYCnlFHaM2/igO1h6X3HA71jcobQuxemgkq4zYo=
github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
github.com/google/gofuzz v1.0.0/go.mod h1:dBl0BpW6vV/+mYPU4Po3pmUjxk6FQPldtuIdl/M65Eg=
github.com/google/uuid v1.1.1 h1:Gkbcsh/GbpXz7lPftLA3P6TYMwjCLYm83jiFQZF/3gY=
github.com/google/uuid v1.1.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
github.com/json-iterator/go v1.1.10 h1:Kz6Cvnvv2wGdaG/V8yMvfkmNiXq9Ya2KUv4rouJJr68=
github.com/json-iterator/go v1.1.10/go.mod h1:KdQUCv79m/52Kvf8AW2vK1V8akMuk1QjK/uOdHXbAo4=
github.com/klauspost/compress v1.13.5 h1:9O69jUPDcsT9fEm74W92rZL9FQY7rCdaXVneq+yyzl4=
github.com/klauspost/compress v1.13.5/go.mod h1:/3/Vjq9QcHkK5uEr5lBEmyoZ1iFhe47etQ6QUkpK6sk=
github.com/klauspost/cpuid v1.2.3/go.mod h1:Pj4uuM528wm8OyEC2QMXAi2YiTZ96dNQPGgoMS4s3ek=
github.com/klauspost/cpuid v1.3.1 h1:5JNjFYYQrZeKRJ0734q51WCEEn2huer72Dc7K+R/b6s=
github.com/klauspost/cpuid v1.3.1/go.mod h1:bYW4mA6ZgKPob1/Dlai2LviZJO7KGI3uoWLd42rAQw4=
github.com/minio/md5-simd v1.1.0 h1:QPfiOqlZH+Cj9teu0t9b1nTBfPbyTl16Of5MeuShdK4=
github.com/minio/md5-simd v1.1.0/go.mod h1:XpBqgZULrMYD3R+M28PcmP0CkI7PEMzB3U77ZrKZ0Gw=
github.com/minio/minio-go/v7 v7.0.20 h1:0+Xt1SkCKDgcx5cmo3UxXcJ37u5Gy+/2i/+eQYqmYJw=
github.com/minio/minio-go/v7 v7.0.20/go.mod h1:ei5JjmxwHaMrgsMrn4U/+Nmg+d8MKS1U2DAn1ou4+Do=
github.com/minio/sha256-simd v0.1.1 h1:5QHSlgo3nt5yKOJrC7W8w7X+NFl8cMPZm96iu8kKUJU=
github.com/minio/sha256-simd v0.1.1/go.mod h1:B5e1o+1/KgNmWrSQK08Y6Z1Vb5pwIktudl0J58iy0KM=
github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG+4E0Y=
github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
github.com/modern-go/reflect2 v0.0.0-20180701023420-4b7aa43c6742/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
github.com/modern-go/reflect2 v1.0.1 h1:9f412s+6RmYXLWZSEzVVgPGK7C2PphHj5RJrvfx9AWI=
github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/rs/xid v1.2.1 h1:mhH9Nq+C1fY2l1XIpgxIiUOfNpRBYH1kKcr+qfKgjRc=
github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ=
github.com/sirupsen/logrus v1.8.1 h1:dJKuHgqk1NNQlqoA6BTlM1Wf9DOH3NBjQyu0h9+AZZE=
github.com/sirupsen/logrus v1.8.1/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
golang.org/x/crypto v0.0.0-20201216223049-8b5274cf687f h1:aZp0e2vLN4MToVqnjNEYEtrEA8RH8U8FN1CU7JgqsPU=
golang.org/x/crypto v0.0.0-20201216223049-8b5274cf687f/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20200707034311-ab3426394381 h1:VXak5I6aEWmAXeQjA+QSZzlgNrpq9mjcfDemuexIKsU=
golang.org/x/net v0.0.0-20200707034311-ab3426394381/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20191026070338-33540a1f6037/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae h1:Ih9Yo4hSPImZOpfGuA4bR/ORKTAbhZo2AbWNRCnevdo=
golang.org/x/sys v0.0.0-20200625212154-ddb9806d33ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
golang.org/x/text v0.3.3 h1:cokOdA+Jmi5PJGXLlLllQSgYigAEfHXJAERHVMaCc2k=
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
gopkg.in/ini.v1 v1.57.0 h1:9unxIsFcTt4I55uWluz+UmL95q4kdJ0buvQ1ZIqVQww=
gopkg.in/ini.v1 v1.57.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=

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package main
import (
"context"
"io"
"log"
"net/http"
"strings"
"github.com/alexflint/go-arg"
"github.com/minio/minio-go/v7"
"github.com/minio/minio-go/v7/pkg/credentials"
)
type args struct {
S3Endpoint string `arg:"--s3-endpoint,required,env:S3_ENDPOINT" help:"host[:port]" placeholder:"ENDPOINT"`
S3Bucket string `arg:"--s3-bucket,required,env:S3_BUCKET" placeholder:"BUCKET"`
S3AccessKey string `arg:"--s3-access-key,env:S3_ACCESS_KEY" placeholder:"ACCESS_KEY"`
S3SecretKey string `arg:"--s3-secret-key,env:S3_SECRET_KEY" placeholder:"SECRET_KEY"`
S3DisableSSL bool `arg:"--s3-disable-ssl,env:S3_DISABLE_SSL" default:"false"`
Address string `arg:"--address,env:ADDRESS" default:":3000" help:"what address to listen on" placeholder:"ADDRESS"`
}
func (args) Version() string {
// TODO
return "s3-proxy 0.1"
}
var s3Client *minio.Client
func main() {
// Warning: Shitty code
var args args
arg.MustParse(&args)
client, err := newClientFromArgs(args)
if err != nil {
log.Panicf("Failed to create s3 client: %s", err.Error())
}
s3Client = client
log.Printf("Starting webserver on: %s", args.Address)
err = http.ListenAndServe(args.Address, http.HandlerFunc(func(rw http.ResponseWriter, r *http.Request) {
path := r.URL.Path
// Only allow GET and HEAD request
if r.Method != http.MethodGet && r.Method != http.MethodHead {
rw.WriteHeader(http.StatusMethodNotAllowed)
return
}
// Edge case with root "/"
if path == "/" {
succ, err := tryObject(createIndexPath(path), rw, r)
if err != nil {
handleError(err, rw, r)
return
}
if !succ {
handle404(rw, r)
return
}
return
}
// Edge case with paths ending with "/index.html"
if strings.HasSuffix(path, "/index.html") {
http.Redirect(rw, r, strings.TrimSuffix(path, "index.html"), http.StatusMovedPermanently)
return
}
// If path ends with "/"
if strings.HasSuffix(path, "/") {
// Try the index file first
succ, err := tryObject(createIndexPath(path), rw, r)
if err != nil {
handleError(err, rw, r)
return
}
if succ {
return
}
// If file without the "/" exists then redirect
if objectExists(r.Context(), strings.TrimSuffix(path, "/")) {
// Redirect
http.Redirect(rw, r, strings.TrimSuffix(path, "/"), http.StatusMovedPermanently)
return
}
// Else 404
handle404(rw, r)
return
} else {
// Try file first
succ, err := tryObject(path, rw, r)
if err != nil {
handleError(err, rw, r)
return
}
if succ {
return
}
// If if path + "/" + "index.html" exists then redirect to path + "/"
if objectExists(r.Context(), createIndexPath(path)) {
redirectUrl := path + "/"
http.Redirect(rw, r, redirectUrl, http.StatusMovedPermanently)
return
}
// else 404
handle404(rw, r)
return
}
}))
if err != nil {
log.Printf("Failed to start webserver: %s", err.Error())
}
}
func objectExists(ctx context.Context, key string) bool {
_, err := s3Client.StatObject(ctx, "www", key, minio.GetObjectOptions{})
response := minio.ToErrorResponse(err)
return !(response.StatusCode == http.StatusNotFound)
}
func tryObject(key string, rw http.ResponseWriter, r *http.Request) (bool, error) {
stat, err := s3Client.StatObject(r.Context(), "www", key, minio.GetObjectOptions{})
if err != nil {
if is404(err) {
return false, nil
} else {
return false, err
}
}
reqEtag := r.Header.Get("If-None-Match")
if reqEtag == stat.ETag {
rw.WriteHeader(http.StatusNotModified)
return true, nil
}
rw.Header().Add("content-type", stat.ContentType)
rw.Header().Add("ETag", stat.ETag)
rw.Header().Add("Server", "Yo mama lol")
if r.Method == http.MethodGet {
obj, err := s3Client.GetObject(r.Context(), "www", key, minio.GetObjectOptions{})
if err != nil {
return false, err
}
_, err = io.Copy(rw, obj)
if err != nil {
return false, err
}
}
return true, nil
}
func createIndexPath(s string) string {
index := s
if !strings.HasSuffix(s, "/") {
index += "/"
}
index += "index.html"
return index
}
func handleError(err error, rw http.ResponseWriter, r *http.Request) {
log.Printf("error: %s : %s", r.URL.Path, err.Error())
rw.WriteHeader(http.StatusInternalServerError)
}
func handle404(rw http.ResponseWriter, r *http.Request) {
rw.WriteHeader(http.StatusNotFound)
}
func is404(err error) bool {
resp := minio.ToErrorResponse(err)
return resp.StatusCode == http.StatusNotFound
}
func newClientFromArgs(args args) (*minio.Client, error) {
if args.S3AccessKey == "" {
return minio.New(args.S3Endpoint, &minio.Options{
Secure: !args.S3DisableSSL,
})
} else {
return minio.New(args.S3Endpoint, &minio.Options{
Secure: !args.S3DisableSSL,
Creds: credentials.NewStaticV4(args.S3AccessKey, args.S3SecretKey, ""),
})
}
}