Simple standalone file upload server with expiration and commandline client.
ephemerup is a simple standalone file server where every uploaded
file expires sooner or later. The server provides a RESTful API and
can be used easily with the commandline client upctl.
The idea is to provide a way to quickly exchange files between parties when no other way is available and the files themselfes are not important enough to keep them around. Think of this szenario: you're working for the network departement and there's a problem with your routing. Tech support asks you to create a network trace and send it to them. But you can't because the trace file is too large and sensitive to be sent by email. This is where ephemerup comes to the rescue.
You upload the file, send the download url to the other party and - assuming you've utilized the defaults - when they download it, it is being deleted immediately from the server. But you can also set an expire time, say 5 days or something like that.
The download urls generated by ephemerup consist of a unique onetime hash, so they are somewhat confident. However, if you're uploading really sensitive data, you better encrypt it.
ephemerup also supports something we call an API Context. There can be many such API contexts. Each of these has an associated token, which has to be used by legitimate clients to authenticate and authorize. A user can only manage uploads within that context. Think "tenant" if you will.
- RESTful API
- Authentication and Authorization through bearer api token
- multiple tenants supported (tenant == api context)
- Each upload gets its own unique id
- download uri is public, no api required, it is intended for end users
- uploads may consist of one or multiple files
- zipped automatically
- uploads expire, either as soon as it gets downloaded or when a timer runs out
- the command line client uses the api
- configuration using HCL language
- docker container build available
- the server supports config by config file, environment variables or flags
- restrictive defaults
A ready to use ephemerup server image is available on
ghcr.io. Supported tags are:
latest or a github release tag.
To try it locally with docker:
docker run -dp 8080:8080 --name eph \
ghcr.io/tlinden/ephemerup:latest \
-LogLevel=info
There's a Dockerfile available for the server so you can build and run it using docker:
make buildimage
docker-compose run ephemerup
Then use the client to test it.
Go to the Releases
page and download the latest tarball for your platform. Unpack it and
execute make install inside the created directory.
This installs both the server ephemerupd and the client upctl.
If you only need the client, just grab the tarball and extract just the client, copy it to your bin folder and you're good to go.
helm repo add tlinden https://tlinden.github.io/ephemerup/
helm repo update
helm upgrade --install ephemerup tlinden/ephemerup --namespace ephemerup --create-namespace
Refer to the chart documentation for help.
For starters, create a minimal values.yaml like this one:
image:
tag: "v0.0.3"Please note that the helm chart doesn't deploy a loadbalancer, you need to do this yourself, if needed.
To build from source, you'll need a go build environment.
Clone the git repo
Just run make to build everything.
ephemerupd -h
--apikeys strings Api key[s] to allow access
-a, --apiprefix string API endpoint path (default "/api")
-n, --appname string App name to say hi as (default "ephemerupd v0.0.1")
-b, --bodylimit int Max allowed upload size in bytes (default 10250000000)
-c, --config string custom config file
-D, --dbfile string Bold database file to use (default "/tmp/uploads.db")
-d, --debug Enable debugging
--frontpage string Content or filename to be displayed on / in case someone visits (default "welcome to upload api, use /api enpoint!")
-4, --ipv4 Only listen on ipv4
-6, --ipv6 Only listen on ipv6
-l, --listen string listen to custom ip:port (use [ip]:port for ipv6) (default ":8080")
-p, --prefork Prefork server threads
-s, --storagedir string storage directory for uploaded files (default "/tmp")
--super string The API Context which has permissions on all contexts
-u, --url string HTTP endpoint w/o path
-v, --version Print program version
All flags can be set using environment variables, prefix the flag with EPHEMERUPD_ and uppercase it, eg:
EPHEMERUPD_LISTEN=:8080
In addition it is possible to set api contexts using env vars (otherwise only possible using the config file):
EPHEMERUPD_CONTEXT_SUPPORT="support:tymag-fycyh-gymof-dysuf-doseb-puxyx"
EPHEMERUPD_CONTEXT_FOOBAR="foobar:U3VuIE1hciAxOSAxMjoyNTo1NyBQTSBDRVQgMjAyMwo"
Configuration can also be done using a config file (searched in the following locations):
/etc/ephemerupd.hcl/usr/local/etc/ephemerupd.hcl~/.config/ephemerupd/ephemerupd.hcl~/.ephemerupd$(pwd)/ephemerupd.hcl
Or using the flag -c. Sample config file:
listen = ":8080"
bodylimit = 10000
apicontext = [
{
context = "root"
key = "0fddbff5d8010f81cd28a7d77f3e38981b13d6164c2fd6e1c3f60a4287630c37",
},
{
context = "foo",
key = "970b391f22f515d96b3e9b86a2c62c627968828e47b356994d2e583188b4190a"
}
]
#url = "https://sokrates.daemon.de"
# this is the root context with all permissions
super = "root"
The server serves the API under the following endpoint:
http://SERVERNAME[:PORT]/api/v1 where SERVERNAME[:PORT] is the
argument to the -l commandline argument or the config option
listen or the environment variable EPHEMERUPD_LISTEN.
By default the server listens on any interface ip4 and ipv6 on TCP
port 8080. You can specify a server name or an ipaddress and a
port. The server can be configured to run on ipv6 (or ipv4) only using
the -4 respective the -6 commandline flags.
It does not support TLS at the moment. Use a nginx reverse proxy in front of it.
Every endpoint returns a JSON object. Each returned object contains the data requested plus:
- success: true or false
- code: HTTP Response Code
- message: error message, if success==false
| HTTP Method | Endpoint | Parameters | Input | Returns | Description |
|---|---|---|---|---|---|
| GET | /v1/uploads | apicontext,q,expire | List of upload objects | list upload objects | |
| POST | /v1/uploads | multipart-formdata file[s] | List of 1 upload object if successful | upload a file and create a new upload object | |
| GET | /v1/uploads/{id} | List of 1 upload object if successful | list one specific upload object matching {id} | ||
| DELETE | /v1/uploads/{id} | Noting | delete an upload object identified by {id} | ||
| PUT | /v1/uploads/{id} | JSON upload object | List of 1 upload object if successful | modify an upload object identified by {id} | |
| GET | /v1/uploads/{id}/file | File download | Download the file associated with the object | ||
| GET | /v1/forms | apicontext,q,expire | List of form objects | list form objects | |
| POST | /v1/forms | JSON form object | List of 1 form object if successful | create a new form object | |
| GET | /v1/forms/{id} | List of 1 form object if successful | list one specific form object matching {id} | ||
| DELETE | /v1/forms/{id} | Noting | delete an form object identified by {id} | ||
| PUT | /v1/forms/{id} | JSON form object | List of 1 form object if successful | modify an form object identified by {id} |
The following endpoints are no API urls, but accessed directly by consumers using their browser or wget etc:
| URL | Description |
|---|---|
| / | Display a short welcome message, can be customized |
| /download/{id}[/{file}] | Download link returned after an upload has been created |
| /form/{id} | Upload form for consumer |
Response:
| Field | Data Type | Description |
|---|---|---|
| success | bool | if true the request was successful |
| code | int | HTTP response code |
| message | string | error message, if any |
| uploads | array | list of upload objects (may be empty) |
| forms | array | list of form objects (may be empty) |
Upload:
| Field | Data Type | Description |
|---|---|---|
| id | string | unique identifier for the object |
| expire | string | when the upload has to expire, either "asap" or a Duration using numbers and the letters d,h,m,s (days,hours,minutes,seconds), e.g. 2d4h30m |
| file | string | filename after uploading, this is what a consumer gets when downloading it |
| members | array of strings | list of the original filenames |
| created | timestamp | time of object creation |
| context | string | the API context the upload has been created under |
| url | string | the download URL |
Form:
| Field | Data Type | Description |
|---|---|---|
| id | string | unique identifier for the object |
| expire | string | when the form has to expire, either "asap" or a Duration using numbers and the letters d,h,m,s (days,hours,minutes,seconds), e.g. 2d4h30m |
| description | string | arbitrary description, shown on the form page |
| context | string | the API context the form has been created under and the uploaded files will be created on |
| notify | string | email address of the form creator, who gets an email once the consumer has uploaded files using the form |
| created | timestamp | time of object creation |
| url | string | the form URL |
Note: if the expire field for a form is not set or set to "asap" only 1 upload object can be created from it. However, if a duration has been specified, the form can be used multiple times and thus creates multiple upload objects.
upctl
Error: No command specified!
Usage:
upctl [options] [flags]
upctl [command]
Available Commands:
completion Generate the autocompletion script for the specified shell
delete Delete an upload
describe Describe an upload.
download Download a file.
form Form commands
help Help about any command
list List uploads
upload Upload files
Flags:
-a, --apikey string Api key to use
-c, --config string custom config file
-d, --debug Enable debugging
-p, --endpoint string upload api endpoint url (default "http://localhost:8080/api/v1")
-h, --help help for upctl
-r, --retries int How often shall we retry to access our endpoint (default 3)
-v, --version Print program version
Use "upctl [command] --help" for more information about a command.
The client must be configured using a config file. The following locations are searched for it:
$(pwd)/upctl.hcl~/.config/upctl/upctl.hcl
Sample config file for a client:
endpoint = "http://localhost:8080/api/v1"
apikey = "970b391f22f515d96b3e9b86a2c62c627968828e47b356994d2e583188b4190a"
The endpoint is the ephemerup server running somewhere and the
apikey is the token you got from the server operator..
- add metrics (as in https://github.com/ansrivas/fiberprometheus)
- do not manually generate output urls, use fiber.GetRoute()
- upd: https://docs.gofiber.io/guide/error-handling/ to always use json output
- add (default by time!) sorting to list outputs, and add sort flag
- with -d reports correctly the 413, w/o it, it reports the timeout before.
curl -X POST localhost:8080/api/putfile -F "upload[]=@xxx" -F "upload[]=@yyy" -H "Content-Type: multipart/form-data"
curl -O http://localhost:8080/api/v1/file/388f41f4-3f0d-41e1-a022-9132c0e9e16f/2023-02-28-18-33-xxx
curl -X DELETE http://localhost:8080/api/v1/file/388f41f4-3f0d-41e1-a022-9132c0e9e16f/
curl -X DELETE http://localhost:8080/api/v1/file/?id=388f41f4-3f0d-41e1-a022-9132c0e9e16f/
curl -X DELETE -H "Accept: application/json" -d '{"id":"$id"}' http://localhost:8080/api/v1/file/