Make 'import' a protected method

Cargo.lock

@@ -1463,7 +1463,7 @@ checksum = "d4fd5641d01c8f18a23da7b6fe29298ff4b55afcccdf78973b24cf3175fee32e"
 
 [[package]]
 name = "pict-rs"
-version = "0.2.0-alpha.2"
+version = "0.2.0-alpha.3"
 dependencies = [
  "actix-form-data",
  "actix-fs",

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "pict-rs"
 description = "A simple image hosting service"
-version = "0.2.0-alpha.2"
+version = "0.2.0-alpha.3"
 authors = ["asonix <asonix@asonix.dog>"]
 license = "AGPL-3.0"
 readme = "README.md"

README.md

@@ -4,7 +4,7 @@ _a simple image hosting service_
 ## Usage
 ### Running
 ```
-pict-rs 0.2.0-alpha.2
+pict-rs 0.2.0-alpha.3
 
 USAGE:
     pict-rs [FLAGS] [OPTIONS] --path <path>
@@ -17,6 +17,8 @@ FLAGS:
 OPTIONS:
     -a, --addr <addr>                      The address and port the server binds to. [env: PICTRS_ADDR=]  [default:
                                            0.0.0.0:8080]
+        --api-key <api-key>                An optional string to be checked on requests to privileged endpoints [env:
+                                           PICTRS_API_KEY=]
     -f, --format <format>                  An optional image format to convert all uploaded files into, supports 'jpg',
                                            'png', and 'webp' [env: PICTRS_FORMAT=]
     -m, --max-file-size <max-file-size>    Specify the maximum allowed uploaded file size (in Megabytes) [env:
@@ -99,9 +101,6 @@ pict-rs offers four endpoints:
         "msg": "ok"
     }
     ```
-- `POST /import` for uploading an image while preserving the filename. This should not be exposed to
-    the public internet, as it can cause naming conflicts with saved files. The upload format and
-    response format are the same as the `POST /image` endpoint.
 - `GET /image/download?url=...` Download an image from a remote server, returning the same JSON
     payload as the `POST` endpoint
 - `GET /image/original/{file}` for getting a full-resolution image. `file` here is the `file` key from the
@@ -119,8 +118,17 @@ pict-rs offers four endpoints:
     GET /image/process.jpg?src=asdf.png&thumbnail=256&blur=3.0
     ```
     which would create a 256x256px JPEG thumbnail and blur it
-- `DELETE /image/delete/{delete_token}/{file}` or `GET /image/delete/{delete_token}/{file}` to delete a file,
-    where `delete_token` and `file` are from the `/image` endpoint's JSON
+- `DELETE /image/delete/{delete_token}/{file}` or `GET /image/delete/{delete_token}/{file}` to
+    delete a file, where `delete_token` and `file` are from the `/image` endpoint's JSON
+- `POST /internal/import` for uploading an image while preserving the filename. This should not be
+    exposed to the public internet, as it can cause naming conflicts with saved files. The upload
+    format and response format are the same as the `POST /image` endpoint.
+
+    This endpoint also requires authentication via the `X-Api-Token` header, and is disabled unless
+    the `--api-key` option is passed to the binary or the PICTRS_API_KEY environment variable is
+    set.
+
+    A secure API key can be generated by any password generator.
 
 ## Contributing
 Feel free to open issues for anything you find an issue with. Please note that any contributed code will be licensed under the AGPLv3.

src/config.rs

@@ -50,6 +50,13 @@ pub(crate) struct Config {
         default_value = "40"
     )]
     max_file_size: usize,
+
+    #[structopt(
+        long,
+        env = "PICTRS_API_KEY",
+        help = "An optional string to be checked on requests to privileged endpoints"
+    )]
+    api_key: Option<String>,
 }
 
 impl Config {
@@ -78,6 +85,10 @@ impl Config {
     pub(crate) fn max_file_size(&self) -> usize {
         self.max_file_size
     }
+
+    pub(crate) fn api_key(&self) -> Option<&str> {
+        self.api_key.as_ref().map(|s| s.as_str())
+    }
 }
 
 #[derive(Debug, thiserror::Error)]

src/main.rs

@@ -24,7 +24,7 @@ mod validate;
 use self::{
     config::Config,
     error::UploadError,
-    middleware::Tracing,
+    middleware::{Internal, Tracing},
     processor::process_image,
     upload_manager::UploadManager,
     validate::{image_webp, video_mp4},
@@ -502,9 +502,13 @@ async fn main() -> Result<(), anyhow::Error> {
                     .service(web::resource("/process.{ext}").route(web::get().to(process))),
             )
             .service(
-                web::resource("/import")
-                    .wrap(import_form.clone())
-                    .route(web::post().to(upload)),
+                web::scope("/internal")
+                    .wrap(Internal(CONFIG.api_key().map(|s| s.to_owned())))
+                    .service(
+                        web::resource("/import")
+                            .wrap(import_form.clone())
+                            .route(web::post().to(upload)),
+                    ),
             )
     })
     .bind(CONFIG.bind_address())?

src/middleware.rs

@@ -1,5 +1,9 @@
-use actix_web::dev::{Service, Transform};
-use futures::future::{ok, Ready};
+use actix_web::{
+    dev::{Service, ServiceRequest, Transform},
+    http::StatusCode,
+    HttpResponse, ResponseError,
+};
+use futures::future::{ok, LocalBoxFuture, Ready};
 use std::task::{Context, Poll};
 use tracing_futures::{Instrument, Instrumented};
 use uuid::Uuid;
@@ -10,6 +14,22 @@ pub(crate) struct TracingMiddleware<S> {
     inner: S,
 }
 
+pub(crate) struct Internal(pub(crate) Option<String>);
+pub(crate) struct InternalMiddleware<S>(Option<String>, S);
+#[derive(Clone, Debug, thiserror::Error)]
+#[error("Invalid API Key")]
+struct ApiError;
+
+impl ResponseError for ApiError {
+    fn status_code(&self) -> StatusCode {
+        StatusCode::UNAUTHORIZED
+    }
+
+    fn error_response(&self) -> HttpResponse {
+        HttpResponse::build(self.status_code()).json(serde_json::json!({ "msg": self.to_string() }))
+    }
+}
+
 impl<S> Transform<S> for Tracing
 where
     S: Service,
@@ -49,3 +69,47 @@ where
             .instrument(tracing::info_span!("request", ?uuid))
     }
 }
+
+impl<S> Transform<S> for Internal
+where
+    S: Service<Request = ServiceRequest, Error = actix_web::Error>,
+    S::Future: 'static,
+{
+    type Request = S::Request;
+    type Response = S::Response;
+    type Error = S::Error;
+    type InitError = ();
+    type Transform = InternalMiddleware<S>;
+    type Future = Ready<Result<Self::Transform, Self::InitError>>;
+
+    fn new_transform(&self, service: S) -> Self::Future {
+        ok(InternalMiddleware(self.0.clone(), service))
+    }
+}
+
+impl<S> Service for InternalMiddleware<S>
+where
+    S: Service<Request = ServiceRequest, Error = actix_web::Error>,
+    S::Future: 'static,
+{
+    type Request = S::Request;
+    type Response = S::Response;
+    type Error = S::Error;
+    type Future = LocalBoxFuture<'static, Result<S::Response, S::Error>>;
+
+    fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+        self.1.poll_ready(cx)
+    }
+
+    fn call(&mut self, req: S::Request) -> Self::Future {
+        if let Some(value) = req.headers().get("x-api-token") {
+            if value.to_str().is_ok() && value.to_str().ok() == self.0.as_ref().map(|s| s.as_str())
+            {
+                let fut = self.1.call(req);
+                return Box::pin(async move { fut.await });
+            }
+        }
+
+        Box::pin(async move { Err(ApiError.into()) })
+    }
+}