add translate

.env.example

@@ -0,0 +1,3 @@
+AILOG_DIR=~/ai/log
+TRANSLATE_URL=http://127.0.0.1:1234/v1
+TRANSLATE_MODEL=plamo-2-translate

.gitignore

@@ -1,6 +1,8 @@
 dist
-.claude
+repos
 node_modules
 package-lock.json
-repos
 CLAUDE.md
+.claude
+.env
+/rust/target

content/did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.post/3mchqlshygs2s.json

@@ -1,7 +1,12 @@
 {
-  "uri": "at://did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.post/3mchqlshygs2s",
   "cid": "bafyreidymanu2xk4ftmvfdna3j7ixyijc37s6h3aytstuqgzatgjl4tp7e",
-  "title": "ailogを作り直した",
   "content": "## ailogとは\n\natprotoと連携するサイトジェネレータ。\n\n## ailogの使い方\n\n```sh\n$ git clone https://git.syui.ai/ai/log\n$ cd log\n$ cat public/config.json\n{\n  \"title\": \"syui.ai\",\n  \"handle\": \"syui.syui.ai\",\n  \"collection\": \"ai.syui.log.post\",\n  \"network\": \"syu.is\",\n  \"color\": \"#0066cc\",\n  \"siteUrl\": \"https://syui.ai\"\n}\n---\n$ npm run dev\n```\n\n## ailogのコンセプト\n\n1. at-browserを基本にする\n2. atproto oauthでログインする\n3. ログインしたアカウントで記事をポストする\n\n## ailogの追加機能\n\n1. atproto recordからjsonをdownloadすると表示速度が上がる(ただし更新はlocalから)\n2. コメントはurlの言及を検索して表示\n\n```sh\n$ npm run fetch\n$ npm run generate\n```",
-  "createdAt": "2026-01-15T13:59:52.367Z"
+  "createdAt": "2026-01-15T13:59:52.367Z",
+  "title": "ailogを作り直した",
+  "translations": {
+    "en": {
+      "content": "## About ailog\n\nA site generator that integrates with atproto.\n\n## Using ailog\n\n```sh\n$ git clone https://git.syui.ai/ai/log\n$ cd log\n$ cat public/config.json\n{\n  \"title\": \"syui.ai\",\n  \"handle\": \"syui.syui.ai\",\n  \"collection\": \"ai.syui.log.post\",\n  \"network\": \"syu.is\",\n  \"color\": \"#0066cc\",\n  \"siteUrl\": \"https://syui.ai\"\n}\n---\n$ npm run dev\n```\n\n## ailog's Concept\n\n1. Based on the at-browser foundation\n2. Logs in via atproto oAuth\n3. Allows posting articles using the logged-in account\n\n## Additional Features of ailog\n\n1. Downloading JSON from atproto record improves display speed (though updates still come from local sources)\n2. Comments are displayed by searching for URL mentions\n\n```sh\n$ npm run fetch\n$ npm run generate\n```"
+    }
+  },
+  "uri": "at://did:plc:vzsvtbtbnwn22xjqhcu3vd6y/ai.syui.log.post/3mchqlshygs2s"
 }

rust/Cargo.toml

@@ -0,0 +1,13 @@
+[package]
+name = "ailog"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+clap = { version = "4", features = ["derive"] }
+tokio = { version = "1", features = ["full"] }
+reqwest = { version = "0.11", features = ["json"] }
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+dotenvy = "0.15"
+dirs = "5"

rust/src/auth.rs

@@ -0,0 +1,44 @@
+use serde::{Deserialize, Serialize};
+use std::fs;
+use std::path::PathBuf;
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct AuthConfig {
+    pub handle: String,
+    pub did: String,
+    pub access_jwt: String,
+    pub refresh_jwt: String,
+    pub pds: String,
+}
+
+pub fn config_dir() -> PathBuf {
+    dirs::config_dir()
+        .unwrap_or_else(|| PathBuf::from("."))
+        .join("syui")
+        .join("ai")
+        .join("log")
+}
+
+pub fn config_path() -> PathBuf {
+    config_dir().join("config.json")
+}
+
+pub fn load_config() -> Option<AuthConfig> {
+    let path = config_path();
+    if path.exists() {
+        let content = fs::read_to_string(&path).ok()?;
+        serde_json::from_str(&content).ok()
+    } else {
+        None
+    }
+}
+
+pub fn save_config(config: &AuthConfig) -> Result<(), Box<dyn std::error::Error>> {
+    let dir = config_dir();
+    fs::create_dir_all(&dir)?;
+    let path = config_path();
+    let content = serde_json::to_string_pretty(config)?;
+    fs::write(&path, content)?;
+    println!("Config saved to: {}", path.display());
+    Ok(())
+}

rust/src/commands/login.rs

@@ -0,0 +1,66 @@
+use crate::auth::{save_config, AuthConfig};
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Serialize)]
+struct CreateSessionRequest {
+    identifier: String,
+    password: String,
+}
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct CreateSessionResponse {
+    did: String,
+    handle: String,
+    access_jwt: String,
+    refresh_jwt: String,
+}
+
+pub async fn run(handle: &str, password: &str, server: &str) -> Result<(), Box<dyn std::error::Error>> {
+    // Add https:// if no protocol specified
+    let server = if server.starts_with("http://") || server.starts_with("https://") {
+        server.to_string()
+    } else {
+        format!("https://{}", server)
+    };
+
+    println!("Logging in as {} to {}", handle, server);
+
+    let client = reqwest::Client::new();
+    let url = format!("{}/xrpc/com.atproto.server.createSession", server);
+
+    let req = CreateSessionRequest {
+        identifier: handle.to_string(),
+        password: password.to_string(),
+    };
+
+    let res = client
+        .post(&url)
+        .json(&req)
+        .send()
+        .await?;
+
+    if !res.status().is_success() {
+        let status = res.status();
+        let body = res.text().await?;
+        return Err(format!("Login failed ({}): {}", status, body).into());
+    }
+
+    let session: CreateSessionResponse = res.json().await?;
+
+    let config = AuthConfig {
+        handle: session.handle.clone(),
+        did: session.did.clone(),
+        access_jwt: session.access_jwt,
+        refresh_jwt: session.refresh_jwt,
+        pds: server.to_string(),
+    };
+
+    save_config(&config)?;
+
+    println!("Logged in successfully!");
+    println!("DID: {}", session.did);
+    println!("Handle: {}", session.handle);
+
+    Ok(())
+}

rust/src/commands/mod.rs

@@ -0,0 +1,4 @@
+pub mod login;
+pub mod refresh;
+pub mod sync;
+pub mod translate;

rust/src/commands/refresh.rs

@@ -0,0 +1,75 @@
+use crate::auth::{load_config, save_config, AuthConfig};
+use serde::Deserialize;
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "camelCase")]
+struct RefreshSessionResponse {
+    did: String,
+    handle: String,
+    access_jwt: String,
+    refresh_jwt: String,
+}
+
+pub async fn run() -> Result<(), Box<dyn std::error::Error>> {
+    let config = load_config().ok_or("Not logged in. Run 'ailog l' first.")?;
+
+    println!("Refreshing session for {}", config.handle);
+
+    let client = reqwest::Client::new();
+    let url = format!("{}/xrpc/com.atproto.server.refreshSession", config.pds);
+
+    let res = client
+        .post(&url)
+        .header("Authorization", format!("Bearer {}", config.refresh_jwt))
+        .send()
+        .await?;
+
+    if !res.status().is_success() {
+        let status = res.status();
+        let body = res.text().await?;
+        return Err(format!("Refresh failed ({}): {}", status, body).into());
+    }
+
+    let session: RefreshSessionResponse = res.json().await?;
+
+    let new_config = AuthConfig {
+        handle: session.handle.clone(),
+        did: session.did.clone(),
+        access_jwt: session.access_jwt,
+        refresh_jwt: session.refresh_jwt,
+        pds: config.pds,
+    };
+
+    save_config(&new_config)?;
+
+    println!("Session refreshed successfully!");
+    println!("DID: {}", session.did);
+
+    Ok(())
+}
+
+/// Refresh token if needed and return valid access token
+pub async fn get_valid_token() -> Result<String, Box<dyn std::error::Error>> {
+    let config = load_config().ok_or("Not logged in. Run 'ailog l' first.")?;
+
+    // Try to use current token, if it fails, refresh
+    let client = reqwest::Client::new();
+    let test_url = format!("{}/xrpc/com.atproto.server.getSession", config.pds);
+
+    let res = client
+        .get(&test_url)
+        .header("Authorization", format!("Bearer {}", config.access_jwt))
+        .send()
+        .await?;
+
+    if res.status().is_success() {
+        return Ok(config.access_jwt);
+    }
+
+    // Token expired, refresh it
+    println!("Token expired, refreshing...");
+    run().await?;
+
+    let new_config = load_config().ok_or("Failed to load refreshed config")?;
+    Ok(new_config.access_jwt)
+}

rust/src/commands/sync.rs

@@ -0,0 +1,117 @@
+use crate::auth::load_config;
+use crate::commands::refresh::get_valid_token;
+use serde::{Deserialize, Serialize};
+use std::fs;
+use std::path::Path;
+
+#[derive(Debug, Serialize)]
+#[serde(rename_all = "camelCase")]
+struct PutRecordRequest {
+    repo: String,
+    collection: String,
+    rkey: String,
+    record: serde_json::Value,
+}
+
+#[derive(Debug, Deserialize)]
+#[allow(dead_code)]
+struct PutRecordResponse {
+    uri: String,
+    cid: String,
+}
+
+pub async fn run(input: &Path, collection: &str) -> Result<(), Box<dyn std::error::Error>> {
+    let config = load_config().ok_or("Not logged in. Run 'ailog l' first.")?;
+
+    if input.is_dir() {
+        sync_folder(input, collection).await
+    } else {
+        sync_file(input, collection, &config.did, &config.pds).await
+    }
+}
+
+async fn sync_file(
+    input: &Path,
+    collection: &str,
+    did: &str,
+    pds: &str,
+) -> Result<(), Box<dyn std::error::Error>> {
+    // Extract rkey from filename (e.g., "3abc123.json" -> "3abc123")
+    let rkey = input
+        .file_stem()
+        .and_then(|s| s.to_str())
+        .ok_or("Invalid filename")?;
+
+    println!("Syncing {} -> {}/{}", input.display(), collection, rkey);
+
+    // Read and parse JSON
+    let content = fs::read_to_string(input)?;
+    let record: serde_json::Value = serde_json::from_str(&content)?;
+
+    // Get valid token (auto-refresh if needed)
+    let token = get_valid_token().await?;
+
+    let client = reqwest::Client::new();
+    let url = format!("{}/xrpc/com.atproto.repo.putRecord", pds);
+
+    let req = PutRecordRequest {
+        repo: did.to_string(),
+        collection: collection.to_string(),
+        rkey: rkey.to_string(),
+        record,
+    };
+
+    let res = client
+        .post(&url)
+        .header("Authorization", format!("Bearer {}", token))
+        .json(&req)
+        .send()
+        .await?;
+
+    if !res.status().is_success() {
+        let status = res.status();
+        let body = res.text().await?;
+        return Err(format!("Put failed ({}): {}", status, body).into());
+    }
+
+    let result: PutRecordResponse = res.json().await?;
+    println!("  OK: {}", result.uri);
+
+    Ok(())
+}
+
+async fn sync_folder(dir: &Path, collection: &str) -> Result<(), Box<dyn std::error::Error>> {
+    let config = load_config().ok_or("Not logged in. Run 'ailog l' first.")?;
+
+    let mut files: Vec<_> = fs::read_dir(dir)?
+        .filter_map(|e| e.ok())
+        .filter(|e| {
+            e.path()
+                .extension()
+                .map(|ext| ext == "json")
+                .unwrap_or(false)
+        })
+        .collect();
+
+    files.sort_by_key(|e| e.path());
+
+    println!("Syncing {} files from {}", files.len(), dir.display());
+
+    let mut success = 0;
+    let mut failed = 0;
+
+    for entry in files {
+        let path = entry.path();
+        match sync_file(&path, collection, &config.did, &config.pds).await {
+            Ok(_) => success += 1,
+            Err(e) => {
+                eprintln!("  ERROR {}: {}", path.display(), e);
+                failed += 1;
+            }
+        }
+    }
+
+    println!("\nDone: {} success, {} failed", success, failed);
+
+    Ok(())
+}

rust/src/commands/translate.rs

@@ -0,0 +1,184 @@
+use serde::{Deserialize, Serialize};
+use std::env;
+use std::fs;
+use std::path::Path;
+
+#[derive(Debug, Serialize)]
+struct ChatMessage {
+    role: String,
+    content: String,
+}
+
+#[derive(Debug, Serialize)]
+struct ChatRequest {
+    model: String,
+    messages: Vec<ChatMessage>,
+}
+
+#[derive(Debug, Deserialize)]
+struct ChatChoice {
+    message: ChatMessageResponse,
+}
+
+#[derive(Debug, Deserialize)]
+struct ChatMessageResponse {
+    content: String,
+}
+
+#[derive(Debug, Deserialize)]
+struct ChatResponse {
+    choices: Vec<ChatChoice>,
+}
+
+pub async fn run(input: &Path, from: &str, to: &str) -> Result<(), Box<dyn std::error::Error>> {
+    if input.is_dir() {
+        translate_folder(input, from, to).await
+    } else {
+        translate_file(input, from, to).await
+    }
+}
+
+async fn translate_file(input: &Path, from: &str, to: &str) -> Result<(), Box<dyn std::error::Error>> {
+    let translate_url = env::var("TRANSLATE_URL")
+        .unwrap_or_else(|_| "http://127.0.0.1:1234/v1".to_string());
+    let model = env::var("TRANSLATE_MODEL")
+        .unwrap_or_else(|_| "plamo-2-translate".to_string());
+
+    println!("Translating: {}", input.display());
+
+    // Read input JSON
+    let content = fs::read_to_string(input)?;
+    let mut record: serde_json::Value = serde_json::from_str(&content)?;
+
+    // Check if already translated
+    if record.get("translations")
+        .and_then(|t| t.get(to))
+        .is_some()
+    {
+        println!("  Skipped (already has {} translation)", to);
+        return Ok(());
+    }
+
+    // Get text to translate
+    let text = record.get("content")
+        .and_then(|v| v.as_str())
+        .ok_or("No 'content' field in JSON")?;
+
+    // Build plamo-2-translate prompt
+    let from_lang = lang_name(from);
+    let to_lang = lang_name(to);
+
+    let system_content = "<|plamo:op|>dataset\ntranslation".to_string();
+    let user_content = format!(
+        "<|plamo:op|>input lang={}\n{}\n<|plamo:op|>output lang={}",
+        from_lang, text, to_lang
+    );
+
+    let req = ChatRequest {
+        model,
+        messages: vec![
+            ChatMessage { role: "system".to_string(), content: system_content },
+            ChatMessage { role: "user".to_string(), content: user_content },
+        ],
+    };
+
+    let client = reqwest::Client::new();
+    let url = format!("{}/chat/completions", translate_url);
+
+    let res = client
+        .post(&url)
+        .json(&req)
+        .send()
+        .await?;
+
+    if !res.status().is_success() {
+        let status = res.status();
+        let body = res.text().await?;
+        return Err(format!("Translation failed ({}): {}", status, body).into());
+    }
+
+    let chat_res: ChatResponse = res.json().await?;
+    let translated = chat_res.choices
+        .first()
+        .map(|c| c.message.content.trim().to_string())
+        .ok_or("No translation result")?;
+
+    // Add translation to record
+    let translations = record
+        .as_object_mut()
+        .ok_or("Invalid JSON")?
+        .entry("translations")
+        .or_insert_with(|| serde_json::json!({}));
+
+    translations
+        .as_object_mut()
+        .ok_or("Invalid translations field")?
+        .insert(to.to_string(), serde_json::json!({
+            "content": translated
+        }));
+
+    // Write back
+    let output = serde_json::to_string_pretty(&record)?;
+    fs::write(input, output)?;
+
+    println!("  OK");
+
+    Ok(())
+}
+
+async fn translate_folder(dir: &Path, from: &str, to: &str) -> Result<(), Box<dyn std::error::Error>> {
+    let mut files: Vec<_> = fs::read_dir(dir)?
+        .filter_map(|e| e.ok())
+        .filter(|e| {
+            e.path()
+                .extension()
+                .map(|ext| ext == "json")
+                .unwrap_or(false)
+        })
+        .collect();
+
+    files.sort_by_key(|e| e.path());
+
+    println!("Translating {} files ({} -> {})", files.len(), from, to);
+
+    let mut success = 0;
+    let mut skipped = 0;
+    let mut failed = 0;
+
+    for entry in files {
+        let path = entry.path();
+        match translate_file(&path, from, to).await {
+            Ok(_) => {
+                // Check if it was actually translated or skipped
+                let content = fs::read_to_string(&path)?;
+                let record: serde_json::Value = serde_json::from_str(&content)?;
+                if record.get("translations").and_then(|t| t.get(to)).is_some() {
+                    success += 1;
+                } else {
+                    skipped += 1;
+                }
+            }
+            Err(e) => {
+                eprintln!("  ERROR {}: {}", path.display(), e);
+                failed += 1;
+            }
+        }
+    }
+
+    println!("\nDone: {} translated, {} skipped, {} failed", success, skipped, failed);
+
+    Ok(())
+}
+
+fn lang_name(code: &str) -> &str {
+    match code {
+        "ja" => "Japanese",
+        "en" => "English",
+        "zh" => "Chinese",
+        "ko" => "Korean",
+        "fr" => "French",
+        "de" => "German",
+        "es" => "Spanish",
+        _ => code,
+    }
+}

rust/src/main.rs

@@ -0,0 +1,112 @@
+use clap::{Parser, Subcommand};
+use std::path::PathBuf;
+
+mod auth;
+mod commands;
+
+fn load_env() {
+    // Try AILOG_DIR env var first (may be set externally)
+    if let Ok(ailog_dir) = std::env::var("AILOG_DIR") {
+        let env_path = PathBuf::from(&ailog_dir).join(".env");
+        if env_path.exists() {
+            let _ = dotenvy::from_path(&env_path);
+            return;
+        }
+    }
+
+    // Try current directory
+    if dotenvy::dotenv().is_ok() {
+        return;
+    }
+
+    // Try executable directory
+    if let Ok(exe_path) = std::env::current_exe() {
+        if let Some(exe_dir) = exe_path.parent() {
+            let env_path = exe_dir.join(".env");
+            if env_path.exists() {
+                let _ = dotenvy::from_path(&env_path);
+            }
+        }
+    }
+}
+
+pub fn get_ailog_dir() -> PathBuf {
+    std::env::var("AILOG_DIR")
+        .map(PathBuf::from)
+        .unwrap_or_else(|_| PathBuf::from("."))
+}
+
+#[derive(Parser)]
+#[command(name = "ailog")]
+#[command(about = "AT Protocol blog tool")]
+struct Cli {
+    #[command(subcommand)]
+    command: Commands,
+}
+
+#[derive(Subcommand)]
+enum Commands {
+    /// Login to PDS (createSession)
+    #[command(name = "l")]
+    Login {
+        /// Handle (e.g., user.bsky.social)
+        handle: String,
+        /// Password
+        #[arg(short, long)]
+        password: String,
+        /// PDS server (e.g., bsky.social)
+        #[arg(short, long, default_value = "bsky.social")]
+        server: String,
+    },
+
+    /// Refresh session token
+    #[command(name = "r")]
+    Refresh,
+
+    /// Translate content (file or folder)
+    #[command(name = "t")]
+    Translate {
+        /// Input JSON file or folder containing *.json
+        input: PathBuf,
+        /// Source language
+        #[arg(short, long, default_value = "ja")]
+        from: String,
+        /// Target language
+        #[arg(short = 'l', long, default_value = "en")]
+        to: String,
+    },
+
+    /// Sync records to PDS (putRecord)
+    #[command(name = "s")]
+    Sync {
+        /// Input JSON file or folder containing *.json
+        input: PathBuf,
+        /// Collection NSID (e.g., ai.syui.log.post)
+        #[arg(short, long)]
+        collection: String,
+    },
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    load_env();
+
+    let cli = Cli::parse();
+
+    match cli.command {
+        Commands::Login { handle, password, server } => {
+            commands::login::run(&handle, &password, &server).await?;
+        }
+        Commands::Refresh => {
+            commands::refresh::run().await?;
+        }
+        Commands::Translate { input, from, to } => {
+            commands::translate::run(&input, &from, &to).await?;
+        }
+        Commands::Sync { input, collection } => {
+            commands::sync::run(&input, &collection).await?;
+        }
+    }
+
+    Ok(())
+}

scripts/generate.ts

@@ -114,6 +114,7 @@ async function listRecordsFromApi(did: string, collection: string, pdsUrl: strin
     title: r.value.title as string || 'Untitled',
     content: r.value.content as string || '',
     createdAt: r.value.createdAt as string || new Date().toISOString(),
+    translations: r.value.translations as BlogPost['translations'] || undefined,
   })).sort((a, b) => new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime())
 }
 
@@ -394,6 +395,31 @@ function generateTabsHtml(activeTab: 'blog' | 'browser', handle: string): string
   `
 }
 
+function generateLangSelectorHtml(): string {
+  const langIcon = `<svg viewBox="0 0 24 24" width="20" height="20" fill="none" stroke="currentColor" stroke-width="2">
+    <circle cx="12" cy="12" r="10"/>
+    <path d="M2 12h20M12 2a15.3 15.3 0 0 1 4 10 15.3 15.3 0 0 1-4 10 15.3 15.3 0 0 1-4-10 15.3 15.3 0 0 1 4-10z"/>
+  </svg>`
+
+  return `
+    <div class="lang-selector" id="lang-selector">
+      <button type="button" class="lang-btn" id="lang-btn" title="Language">
+        ${langIcon}
+      </button>
+      <div class="lang-dropdown" id="lang-dropdown">
+        <div class="lang-option" data-lang="ja">
+          <span class="lang-name">日本語</span>
+          <span class="lang-check">✓</span>
+        </div>
+        <div class="lang-option selected" data-lang="en">
+          <span class="lang-name">English</span>
+          <span class="lang-check">✓</span>
+        </div>
+      </div>
+    </div>
+  `
+}
+
 function generatePostListHtml(posts: BlogPost[]): string {
   if (posts.length === 0) {
     return '<p class="no-posts">No posts yet</p>'
@@ -409,7 +435,10 @@ function generatePostListHtml(posts: BlogPost[]): string {
       </li>
     `
   }).join('')
-  return `<ul class="post-list">${items}</ul>`
+  return `
+    <div class="content-header">${generateLangSelectorHtml()}</div>
+    <ul class="post-list">${items}</ul>
+  `
 }
 
 // Map network to app URL for discussion links
@@ -423,7 +452,15 @@ function getAppUrl(network: string): string {
 function generatePostDetailHtml(post: BlogPost, handle: string, collection: string, network: string, siteUrl?: string): string {
   const rkey = post.uri.split('/').pop() || ''
   const jsonUrl = `/at/${handle}/${collection}/${rkey}/`
-  const content = marked.parse(post.content) as string
+  const originalContent = marked.parse(post.content) as string
+
+  // Check for English translation
+  const hasTranslation = post.translations?.en?.content
+  const translatedContent = hasTranslation ? marked.parse(post.translations!.en.content) as string : ''
+
+  // Default to English if translation exists
+  const displayContent = hasTranslation ? translatedContent : originalContent
+
   // Use siteUrl from config, or construct from handle
   const baseSiteUrl = siteUrl || `https://${handle}`
   const postUrl = `${baseSiteUrl}/post/${rkey}/`
@@ -439,8 +476,14 @@ function generatePostDetailHtml(post: BlogPost, handle: string, collection: stri
   const searchQuery = basePath + rkeyPrefix
   const searchUrl = `${appUrl}/search?q=${encodeURIComponent(searchQuery)}`
 
+  // Store original and translated content as data attributes for JS switching
+  const dataAttrs = hasTranslation
+    ? ` data-original-content="${escapeHtml(originalContent)}" data-translated-content="${escapeHtml(translatedContent)}"`
+    : ''
+
   return `
-    <article class="post-detail">
+    <div class="content-header">${generateLangSelectorHtml()}</div>
+    <article class="post-detail"${dataAttrs}>
       <header class="post-header">
         <h1 class="post-title">${escapeHtml(post.title)}</h1>
         <div class="post-meta">
@@ -448,7 +491,7 @@ function generatePostDetailHtml(post: BlogPost, handle: string, collection: stri
           <a href="${jsonUrl}" class="json-btn">json</a>
         </div>
       </header>
-      <div class="post-content">${content}</div>
+      <div class="post-content">${displayContent}</div>
     </article>
     <div class="discussion-section">
       <a href="${searchUrl}" target="_blank" rel="noopener" class="discuss-link">

src/lib/api.ts

@@ -270,9 +270,15 @@ export async function searchPostsForUrl(url: string): Promise<any[]> {
   const searchPromises = endpoints.flatMap(endpoint =>
     searchQueries.map(async query => {
       try {
+        const controller = new AbortController()
+        const timeoutId = setTimeout(() => controller.abort(), 5000) // 5s timeout
+
         const res = await fetch(
-          `${endpoint}/xrpc/app.bsky.feed.searchPosts?q=${encodeURIComponent(query)}&limit=20`
+          `${endpoint}/xrpc/app.bsky.feed.searchPosts?q=${encodeURIComponent(query)}&limit=20`,
+          { signal: controller.signal }
         )
+        clearTimeout(timeoutId)
+
         if (!res.ok) return []
         const data = await res.json()
         // Filter posts that actually link to the target URL
@@ -282,6 +288,7 @@ export async function searchPostsForUrl(url: string): Promise<any[]> {
           return embedUri === url || text.includes(url) || embedUri?.includes(url.replace(/\/$/, ''))
         })
       } catch {
+        // Silently fail for CORS/network/timeout errors
         return []
       }
     })

src/lib/auth.ts

@@ -98,8 +98,12 @@ export async function restoreSession(): Promise<AuthSession | null> {
       }
     }
   } catch (err) {
+    // Silently fail for CORS/network errors - don't spam console
+    // Only log if it's not a network error
+    if (err instanceof Error && !err.message.includes('NetworkError') && !err.message.includes('CORS')) {
       console.error('Session restore error:', err)
     }
+  }
   return null
 }
 

src/main.ts

@@ -15,6 +15,7 @@ let authSession: AuthSession | null = null
 let config: AppConfig
 let networks: Networks = {}
 let browserNetwork: string = ''  // Network for AT Browser
+let currentLang: string = 'en'  // Default language for translations
 
 // Browser state
 let browserMode = false
@@ -131,6 +132,68 @@ function updatePdsSelector(): void {
   })
 }
 
+function renderLangSelector(): string {
+  const langs = [
+    { code: 'ja', name: '日本語' },
+    { code: 'en', name: 'English' },
+  ]
+
+  const options = langs.map(lang => {
+    const isSelected = lang.code === currentLang
+    return `<div class="lang-option ${isSelected ? 'selected' : ''}" data-lang="${lang.code}">
+      <span class="lang-name">${lang.name}</span>
+      <span class="lang-check">✓</span>
+    </div>`
+  }).join('')
+
+  const langIcon = `<svg viewBox="0 0 24 24" width="20" height="20" fill="none" stroke="currentColor" stroke-width="2">
+    <circle cx="12" cy="12" r="10"/>
+    <path d="M2 12h20M12 2a15.3 15.3 0 0 1 4 10 15.3 15.3 0 0 1-4 10 15.3 15.3 0 0 1-4-10 15.3 15.3 0 0 1 4-10z"/>
+  </svg>`
+
+  return `
+    <div class="lang-selector" id="lang-selector">
+      <button type="button" class="lang-btn" id="lang-btn" title="Language">
+        ${langIcon}
+      </button>
+      <div class="lang-dropdown" id="lang-dropdown">
+        ${options}
+      </div>
+    </div>
+  `
+}
+
+function updateLangSelector(): void {
+  const dropdown = document.getElementById('lang-dropdown')
+  if (!dropdown) return
+
+  const options = dropdown.querySelectorAll('.lang-option')
+  options.forEach(opt => {
+    const el = opt as HTMLElement
+    const lang = el.dataset.lang
+    const isSelected = lang === currentLang
+    el.classList.toggle('selected', isSelected)
+  })
+}
+
+function applyTranslation(): void {
+  const contentEl = document.querySelector('.post-content')
+  if (!contentEl) return
+
+  // Get original and translated content from data attributes
+  const postDetail = document.querySelector('.post-detail')
+  if (!postDetail) return
+
+  const originalContent = (postDetail as HTMLElement).dataset.originalContent
+  const translatedContent = (postDetail as HTMLElement).dataset.translatedContent
+
+  if (currentLang === 'en' && translatedContent) {
+    contentEl.innerHTML = translatedContent
+  } else if (originalContent) {
+    contentEl.innerHTML = originalContent
+  }
+}
+
 function renderTabs(activeTab: 'blog' | 'browser' | 'new', isLoggedIn: boolean): string {
   let tabs = `
     <a href="/" class="tab ${activeTab === 'blog' ? 'active' : ''}" id="blog-tab">Blog</a>
@@ -467,6 +530,44 @@ function setupEventHandlers(): void {
       }
     }
 
+    // Lang button - toggle dropdown
+    if (target.id === 'lang-btn' || target.closest('#lang-btn')) {
+      e.preventDefault()
+      e.stopPropagation()
+      const dropdown = document.getElementById('lang-dropdown')
+      if (dropdown) {
+        dropdown.classList.toggle('show')
+      }
+      return
+    }
+
+    // Lang option selection
+    const langOption = target.closest('.lang-option') as HTMLElement
+    if (langOption) {
+      e.preventDefault()
+      const selectedLang = langOption.dataset.lang
+      if (selectedLang && selectedLang !== currentLang) {
+        currentLang = selectedLang
+        localStorage.setItem('preferredLang', selectedLang)
+        updateLangSelector()
+        applyTranslation()
+      }
+      // Close dropdown
+      const dropdown = document.getElementById('lang-dropdown')
+      if (dropdown) {
+        dropdown.classList.remove('show')
+      }
+      return
+    }
+
+    // Close lang dropdown when clicking outside
+    if (!target.closest('#lang-selector')) {
+      const dropdown = document.getElementById('lang-dropdown')
+      if (dropdown) {
+        dropdown.classList.remove('show')
+      }
+    }
+
     // JSON button click (on post detail page)
     const jsonBtn = target.closest('.json-btn') as HTMLAnchorElement
     if (jsonBtn) {
@@ -604,6 +705,34 @@ async function render(): Promise<void> {
     // For blog top page, check for new posts from API and merge
     if (route.type === 'blog') {
       refreshPostListFromAPI()
+      // Add lang selector above post list
+      const postList = contentEl?.querySelector('.post-list')
+      if (postList && !document.getElementById('lang-selector')) {
+        const contentHeader = document.createElement('div')
+        contentHeader.className = 'content-header'
+        contentHeader.innerHTML = renderLangSelector()
+        postList.parentNode?.insertBefore(contentHeader, postList)
+      }
+    }
+
+    // For post detail page, sync lang selector state and apply translation
+    if (route.type === 'post') {
+      // Update lang selector to match current language
+      updateLangSelector()
+
+      // Apply translation based on current language preference
+      const postDetail = contentEl?.querySelector('.post-detail') as HTMLElement
+      if (postDetail) {
+        const hasTranslation = postDetail.dataset.translatedContent
+        if (hasTranslation) {
+          applyTranslation()
+        }
+      }
+    }
+
+    // For blog index page, sync lang selector state
+    if (route.type === 'blog') {
+      updateLangSelector()
     }
 
     return // Skip content re-rendering
@@ -712,6 +841,9 @@ async function init(): Promise<void> {
   // Initialize browser network from localStorage or default to config.network
   browserNetwork = localStorage.getItem('browserNetwork') || config.network
 
+  // Initialize language preference from localStorage (default: en)
+  currentLang = localStorage.getItem('preferredLang') || 'en'
+
   // Set network config based on selected browser network
   const selectedNetworkConfig = networks[browserNetwork]
   if (selectedNetworkConfig) {

src/styles/main.css

@@ -961,6 +961,125 @@ body {
   color: transparent;
 }
 
+/* Language Selector */
+.lang-selector {
+  position: relative;
+}
+
+.lang-btn {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 36px;
+  height: 36px;
+  background: #f0f0f0;
+  border: 1px solid #ddd;
+  border-radius: 6px;
+  cursor: pointer;
+  color: #666;
+  font-size: 18px;
+}
+
+.lang-btn:hover {
+  background: #e0e0e0;
+}
+
+.lang-dropdown {
+  display: none;
+  position: absolute;
+  top: 100%;
+  right: 0;
+  margin-top: 4px;
+  background: #fff;
+  border: 1px solid #ddd;
+  border-radius: 8px;
+  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
+  min-width: 140px;
+  z-index: 100;
+  overflow: hidden;
+}
+
+.lang-dropdown.show {
+  display: block;
+}
+
+.lang-option {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 12px 16px;
+  cursor: pointer;
+  font-size: 14px;
+  transition: background 0.15s;
+}
+
+.lang-option:hover {
+  background: #f5f5f5;
+}
+
+.lang-option.selected {
+  background: linear-gradient(135deg, #f0f7ff 0%, #e8f4ff 100%);
+}
+
+.lang-name {
+  color: #333;
+  font-weight: 500;
+}
+
+.lang-check {
+  width: 18px;
+  height: 18px;
+  border-radius: 50%;
+  border: 2px solid #ccc;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 10px;
+  transition: all 0.2s;
+}
+
+.lang-option.selected .lang-check {
+  background: var(--btn-color);
+  border-color: var(--btn-color);
+  color: #fff;
+}
+
+.lang-option:not(.selected) .lang-check {
+  color: transparent;
+}
+
+/* Content Header (above post list) */
+.content-header {
+  display: flex;
+  justify-content: flex-end;
+  align-items: center;
+  margin-bottom: 8px;
+}
+
+@media (prefers-color-scheme: dark) {
+  .lang-btn {
+    background: #2a2a2a;
+    border-color: #333;
+    color: #888;
+  }
+  .lang-btn:hover {
+    background: #333;
+  }
+  .lang-dropdown {
+    background: #1a1a1a;
+    border-color: #333;
+  }
+  .lang-option:hover {
+    background: #2a2a2a;
+  }
+  .lang-option.selected {
+    background: linear-gradient(135deg, #1a2a3a 0%, #1a3040 100%);
+  }
+  .lang-name {
+    color: #e0e0e0;
+  }
+}
+
 /* AT Browser */
 .server-info {
   padding: 16px 0;

src/types.ts

@@ -13,6 +13,12 @@ export interface BlogPost {
   title: string
   content: string
   createdAt: string
+  translations?: {
+    [lang: string]: {
+      content: string
+      title?: string
+    }
+  }
 }
 
 export interface NetworkConfig {