Add schema to retrieve file content and api to get a file by id

Signed-off-by: trivernis <trivernis@protonmail.com>

mediarepo-api/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mediarepo-api"
-version = "0.6.0"
+version = "0.7.0"
 edition = "2018"
 license = "gpl-3"
 
@@ -16,6 +16,8 @@ serde_json = {version="1.0.68", optional=true}
 directories = {version="4.0.1", optional=true}
 mime_guess = {version = "2.0.3", optional=true}
 serde_piecewise_default = "0.2.0"
+futures = {version = "0.3.17", optional=true}
+url = {version = "2.2.2", optional=true }
 
 [dependencies.serde]
 version = "1.0.130"
@@ -41,5 +43,5 @@ version = "0.5.8"
 optional = true
 
 [features]
-tauri-plugin = ["client-api","tauri", "rmp-ipc", "parking_lot", "serde_json", "tokio", "toml", "directories", "mime_guess"]
+tauri-plugin = ["client-api","tauri", "rmp-ipc", "parking_lot", "serde_json", "tokio", "toml", "directories", "mime_guess", "futures", "url"]
 client-api = ["rmp-ipc", "async-trait", "tokio"]

mediarepo-api/src/client_api/file.rs

@@ -55,6 +55,11 @@ where
         self.emit_and_get("all_files", ()).await
     }
 
+    /// Returns a file by identifier
+    pub async fn get_file(&self, id: FileIdentifier) -> ApiResult<FileMetadataResponse> {
+        self.emit_and_get("get_file", id).await
+    }
+
     /// Searches for a file by a list of tags
     #[tracing::instrument(level = "debug", skip(self))]
     pub async fn find_files(

mediarepo-api/src/tauri_plugin/custom_schemes.rs

@@ -1,9 +1,21 @@
-use crate::tauri_plugin::state::BufferState;
-use tauri::http::ResponseBuilder;
-use tauri::{Builder, Manager, Runtime};
+use crate::tauri_plugin::state::{ApiState, BufferState};
+use crate::types::identifier::FileIdentifier;
+use std::borrow::Cow;
+use std::collections::HashMap;
+use tauri::http::{Request, Response, ResponseBuilder};
+use tauri::{AppHandle, Builder, Manager, Runtime};
+use url::Url;
+
+type Result<T> = std::result::Result<T, Box<dyn std::error::Error>>;
 
 pub fn register_custom_uri_schemes<R: Runtime>(builder: Builder<R>) -> Builder<R> {
-    builder.register_uri_scheme_protocol("once", |app, request| {
+    builder
+        .register_uri_scheme_protocol("once", once_scheme)
+        .register_uri_scheme_protocol("content", content_scheme)
+        .register_uri_scheme_protocol("thumb", thumb_scheme)
+}
+
+fn once_scheme<R: Runtime>(app: &AppHandle<R>, request: &Request) -> Result<Response> {
     let buf_state = app.state::<BufferState>();
     let resource_key = request.uri().trim_start_matches("once://");
 
@@ -20,5 +32,73 @@ pub fn register_custom_uri_schemes<R: Runtime>(builder: Builder<R>) -> Builder<R
             .status(404)
             .body("Resource not found".as_bytes().to_vec())
     }
-    })
+}
+
+fn content_scheme<R: Runtime>(app: &AppHandle<R>, request: &Request) -> Result<Response> {
+    let api_state = app.state::<ApiState>();
+    let buf_state = app.state::<BufferState>();
+    let hash = request.uri().trim_start_matches("content://");
+
+    if let Some(buffer) = buf_state.get_entry(hash) {
+        ResponseBuilder::new()
+            .status(200)
+            .mimetype(&buffer.mime)
+            .body(buffer.buf)
+    } else {
+        let api = api_state.api_sync()?;
+        let file =
+            futures::executor::block_on(api.file.get_file(FileIdentifier::Hash(hash.to_string())))?;
+        let mime = file.mime_type.unwrap_or("image/png".to_string());
+        let bytes = futures::executor::block_on(
+            api.file
+                .read_file_by_hash(FileIdentifier::Hash(hash.to_string())),
+        )?;
+        buf_state.add_entry(hash.to_string(), mime.clone(), bytes.clone());
+        ResponseBuilder::new()
+            .mimetype(&mime)
+            .status(200)
+            .body(bytes)
+    }
+}
+
+fn thumb_scheme<R: Runtime>(app: &AppHandle<R>, request: &Request) -> Result<Response> {
+    let api_state = app.state::<ApiState>();
+    let buf_state = app.state::<BufferState>();
+
+    let url = Url::parse(request.uri())?;
+    let hash = url.path();
+
+    let query_pairs = url
+        .query_pairs()
+        .collect::<HashMap<Cow<'_, str>, Cow<'_, str>>>();
+
+    let height = query_pairs
+        .get("height")
+        .and_then(|h| h.parse::<u32>().ok())
+        .unwrap_or(250);
+
+    let width = query_pairs
+        .get("width")
+        .and_then(|w| w.parse::<u32>().ok())
+        .unwrap_or(250);
+
+    if let Some(buffer) = buf_state.get_entry(hash) {
+        ResponseBuilder::new()
+            .status(200)
+            .mimetype(&buffer.mime)
+            .body(buffer.buf)
+    } else {
+        let api = api_state.api_sync()?;
+        let (thumb, bytes) = futures::executor::block_on(api.file.get_thumbnail_of_size(
+            FileIdentifier::Hash(hash.to_string()),
+            ((height as f32 * 0.8) as u32, (width as f32 * 0.8) as u32),
+            ((height as f32 * 1.2) as u32, (width as f32 * 1.2) as u32),
+        ))?;
+        let mime = thumb.mime_type.unwrap_or(String::from("image/png"));
+        buf_state.add_entry(hash.to_string(), mime.clone(), bytes.clone());
+        ResponseBuilder::new()
+            .mimetype(&mime)
+            .status(200)
+            .body(bytes)
+    }
 }

mediarepo-api/src/tauri_plugin/state.rs

@@ -54,6 +54,10 @@ impl ApiState {
             .clone()
             .ok_or_else(|| PluginError::from("Not connected"))
     }
+
+    pub fn api_sync(&self) -> PluginResult<ApiClient<ApiProtocolListener>> {
+        futures::executor::block_on(self.api())
+    }
 }
 
 #[derive(Clone)]
@@ -79,6 +83,13 @@ pub struct BufferState {
 }
 
 impl BufferState {
+    /// Adds a cached buffer to the buffer state
+    pub fn add_entry(&self, key: String, mime: String, bytes: Vec<u8>) {
+        let mut buffers = self.buffer.write();
+        let buffer = VolatileBuffer::new(mime, bytes);
+        buffers.insert(key, Mutex::new(buffer));
+    }
+
     /// Checks if an entry for the specific key exists and resets
     /// its state so that it can safely be accessed again.
     pub fn reserve_entry(&self, key: &String) -> bool {