Start implementing IPFS CDN

Cargo.toml

@@ -17,3 +17,7 @@ sqlx = { version = "0.3", features = [ "mysql" ] }
 rand = "0.8.0"
 structopt = "0.3.22"
 toml = "0.5.8"
+reqwest = { version = "0.11", features = ["stream", "multipart"] }
+new_mime_guess = "3.0.2"
+headers = "0.3.5"
+url = {version = "2.2.2", features = ["serde"]}

src/cdn/mod.rs

@@ -0,0 +1,51 @@
+
+use axum::{Router, body::Body, extract::{Extension, Path}, handler::get, http::HeaderMap, response::IntoResponse, routing::BoxRoute};
+use headers::{ContentType, HeaderMapExt};
+use reqwest::{StatusCode, header::{CONTENT_LENGTH, HeaderName}};
+use sqlx::{Error, MySqlPool};
+
+use crate::config::ConfVars;
+
+mod sql;
+
+pub fn routes() -> Router<BoxRoute> {
+    Router::new()
+    .route("/:user/:filename", get(image))
+    .boxed()
+}
+
+async fn image(Path((user, filename)): Path<(String, String)>, Extension(db_pool): Extension<MySqlPool>, Extension(vars): Extension<ConfVars>) -> Result<impl IntoResponse, StatusCode> {
+    let q = sql::get_cid(user, filename.clone(), &db_pool).await;
+    match q {
+        Ok(cid) => {
+            let ipfsapi = vars.ipfs_client();
+            match ipfsapi {
+                Ok(ipfs) => {
+                    let res = ipfs.cat(cid).await;
+                    match res {
+                        Ok(r) => {
+                            let clength = r.headers().get(HeaderName::from_static("x-content-length"));
+                            match clength {
+                                Some(h) => {
+                                    let mut headers = HeaderMap::new();
+                                    let ctype = ContentType::from(new_mime_guess::from_path(filename).first_or_octet_stream());
+                                    headers.typed_insert(ctype);
+                                    headers.insert(CONTENT_LENGTH, h.clone());    
+                                    
+                                    Ok((StatusCode::OK, headers, Body::wrap_stream(r.bytes_stream())))
+                                },
+                                None => Err(StatusCode::INTERNAL_SERVER_ERROR),
+                            }
+                        },
+                        Err(_) => Err(StatusCode::INTERNAL_SERVER_ERROR),
+                    }
+                },
+                Err(_) => Err(StatusCode::INTERNAL_SERVER_ERROR),
+            }
+        },
+        Err(err) => match err {
+            Error::RowNotFound => Err(StatusCode::NOT_FOUND),
+            _ => Err(StatusCode::INTERNAL_SERVER_ERROR),
+        },
+    }
+}

src/cdn/sql.rs

@@ -0,0 +1,11 @@
+use sqlx::{MySqlPool, Result, Row, mysql::MySqlRow};
+
+
+pub async fn get_cid(user: String, filename: String, pool: &MySqlPool) -> Result<String> {
+
+    let q: String = sqlx::query("SELECT cid FROM memes WHERE user = ? AND filename = ? ORDER BY id DESC").bind(user).bind(filename)
+        .map(|row: MySqlRow| row.get("cid"))
+        .fetch_one(pool).await?;
+        Ok(q)
+
+}

src/config.rs

@@ -1,4 +1,5 @@
 use std::net::SocketAddr;
+use reqwest::Url;
 use serde::Deserialize;
 
 #[derive(Deserialize)]
@@ -6,10 +7,12 @@ pub struct Config {
     pub addr: SocketAddr,
     pub database: String,
     pub cdn: String,
+    pub ipfs_api: Url,
 }
 
 pub struct ConfVars {
     pub cdn: String,
+    pub ipfs_api: Url,
 }
 
 impl Config {
@@ -17,6 +20,7 @@ impl Config {
     pub fn vars(&self) -> ConfVars {
         ConfVars {
             cdn: self.cdn.clone(),
+            ipfs_api: self.ipfs_api.clone(),
         }
     }
 
@@ -24,6 +28,6 @@ impl Config {
 
 impl Clone for ConfVars {
     fn clone(&self) -> Self {
-        Self { cdn: self.cdn.clone() }
+        Self { cdn: self.cdn.clone(), ipfs_api: self.ipfs_api.clone() }
     }
 }

src/ipfs/mod.rs

@@ -0,0 +1,65 @@
+use reqwest::{Client, Response, Result, Url};
+use serde::{Deserialize, Serialize};
+
+use crate::config::ConfVars;
+
+#[derive(Deserialize)]
+pub struct AddResponse {
+    #[serde(rename = "Bytes")]
+    pub bytes: String,
+    #[serde(rename = "Hash")]
+    pub hash: String,
+    #[serde(rename = "Name")]
+    pub name: String,
+    #[serde(rename = "Size")]
+    pub size: String,
+}
+
+#[derive(Serialize)]
+pub struct CatQuery {
+    pub arg: String,
+}
+
+pub struct IpfsClient {
+    url: Url,
+    client: Client,
+}
+
+impl IpfsClient {
+
+    pub fn cat_url(&self) -> Url {
+        self.url.join("/api/v0/cat").expect("Something went wrong with the IPFS URL")
+    }
+
+    pub fn add_url(&self) -> Url {
+        self.url.join("/api/v0/add").expect("Something went wrong with the IPFS URL")
+    }
+
+    pub async fn cat(&self, cid: String) -> Result<Response> {
+        let request = self.client.post(self.cat_url()).query(&CatQuery::new(cid));
+        request.send().await
+    }
+    
+}
+
+impl CatQuery {
+    
+    pub fn new(cid: String) -> Self {
+        Self {
+            arg: cid,
+        }
+    }
+
+}
+
+impl ConfVars {
+
+    pub fn ipfs_client(&self) -> Result<IpfsClient> {
+        let client =reqwest::ClientBuilder::new().user_agent("curl").build()?;
+        Ok(IpfsClient {
+            url: self.ipfs_api.clone(),
+            client,
+        })
+    }
+    
+}

src/main.rs

@@ -1,4 +1,4 @@
-use std::{env, io, path::PathBuf};
+use std::path::PathBuf;
 use config::Config;
 use sqlx::MySqlPool;
 use structopt::StructOpt;
@@ -6,7 +6,9 @@ use axum::{Router, body::Body, http::{HeaderValue, Request, header}};
 use tower_http::{add_extension::AddExtensionLayer, set_header::SetResponseHeaderLayer};
 
 mod v1;
+mod cdn;
 mod config;
+mod ipfs;
 
 #[derive(StructOpt)]
 struct Opt {
@@ -29,7 +31,8 @@ async fn main() {
     let db_pool = MySqlPool::new(&config.database).await.expect("Database connection error");
 
     let app = Router::new()
-        .nest("/v1", v1::routes())
+        .nest("/api/v1", v1::routes())
+        .nest("/cdn", cdn::routes())
         .layer(AddExtensionLayer::new(db_pool))
         .layer(AddExtensionLayer::new(config.vars()))
         .layer(SetResponseHeaderLayer::<_, Request<Body>>::if_not_present(header::ACCESS_CONTROL_ALLOW_ORIGIN, HeaderValue::from_static("*")));

src/v1/sql.rs

@@ -1,7 +1,6 @@
 use crate::v1::models::{Meme, MemeFilterQuery, Category, User, UserIDQuery};
 use sqlx::{MySqlPool, Result, Row};
 use sqlx::mysql::MySqlRow;
-use std::env;
 
 pub struct DBMeme {
     pub id: i32,
@@ -16,7 +15,7 @@ pub struct DBMeme {
 impl Meme {
 
     pub fn new(meme: DBMeme, cdn: String) -> Self {
-        Meme {
+        Self {
             id: meme.id.to_string(),
             link: format!("{}/{}/{}", cdn, meme.userdir, meme.filename),
             category: meme.category,