Release v0.3

Makefile

@@ -13,7 +13,7 @@ ifeq ($(MAKECMDGOALS),)
   endif
 endif
 
-VERSION_TAG := v0.2
+VERSION_TAG := v0.3
 TITLE_ID    := FMGR88888
 PYTHON      ?= python3
 STRIP       ?= $(PS5_PAYLOAD_SDK)/bin/prospero-strip
@@ -63,7 +63,7 @@ gen:
 clean:
 	rm -rf $(BIN) $(LEGACY_BIN) $(LINUX_BIN) gen
 
-gen/%.c: assets/% gen-asset-module.py gen
+gen/%.c: assets/% gen-asset-module.py | gen
 	$(PYTHON) gen-asset-module.py --path $* $< > $@
 
 $(BIN): $(PS5_SRCS) $(GEN_SRCS)

README.md

@@ -10,16 +10,18 @@ PS5 web file manager payload. It runs an HTTP UI starting at port `8888`, instal
 ## Screenshots
 
 <p>
-  <a href="docs/screenshots/20260617_231827.376.jpg" target="_blank"><img src="docs/screenshots/20260617_231827.376.jpg" width="23%" alt="PS5 Web File Manager screenshot 1"></a>
-  <a href="docs/screenshots/20260617_231842.645.jpg" target="_blank"><img src="docs/screenshots/20260617_231842.645.jpg" width="23%" alt="PS5 Web File Manager screenshot 2"></a>
-  <a href="docs/screenshots/20260617_232348.855.jpg" target="_blank"><img src="docs/screenshots/20260617_232348.855.jpg" width="23%" alt="PS5 Web File Manager screenshot 3"></a>
-  <a href="docs/screenshots/20260617_231943.120.jpg" target="_blank"><img src="docs/screenshots/20260617_231943.120.jpg" width="23%" alt="PS5 Web File Manager screenshot 4"></a>
+  <a href="docs/screenshots/20260617_231827.376.jpg" target="_blank"><img src="docs/screenshots/20260617_231827.376.jpg" width="31%" alt="PS5 Web File Manager screenshot 1"></a>
+  <a href="docs/screenshots/20260619_131432.399.jpg" target="_blank"><img src="docs/screenshots/20260619_131432.399.jpg" width="31%" alt="PS5 Web File Manager screenshot 2"></a>
+  <a href="docs/screenshots/20260617_232348.855.jpg" target="_blank"><img src="docs/screenshots/20260617_232348.855.jpg" width="31%" alt="PS5 Web File Manager screenshot 3"></a>
+  <a href="docs/screenshots/20260619_131811.644.jpg" target="_blank"><img src="docs/screenshots/20260619_131811.644.jpg" width="31%" alt="PS5 Web File Manager screenshot 4"></a>
+  <a href="docs/screenshots/20260619_131535.239.jpg" target="_blank"><img src="docs/screenshots/20260619_131535.239.jpg" width="31%" alt="PS5 Web File Manager screenshot 5"></a>
 </p>
 
 ## Features
 
 - List files and folders.
 - Copy, move, delete, rename, and create folders.
+- Edit UTF-8 text files up to 1 MiB using the built-in plain text editor.
 - Multi-select operations.
 - Copy/move by choosing sources first, then pasting or moving them into the current folder.
 - Conflict prompts for overwriting files and merging folders.
@@ -27,6 +29,7 @@ PS5 web file manager payload. It runs an HTTP UI starting at port `8888`, instal
 - Copied/moved files and folders are set to `0777` where the filesystem supports Unix permissions. FAT/exFAT-style filesystems may ignore chmod.
 - Chinese and English UI. The browser language is read from `navigator.languages` / `navigator.language`; Chinese uses `zh`, everything else uses English.
 - Startup notification showing the app name, version, and listen port.
+- Create/edit text files ending with `.txt`, `.json`, `.xml`, `.ini`, `.cfg`, `.conf`, `.md`, `.log`, `.lua`, `.js`, `.css`, `.html`, `.htm`, `.c`, `.h`, `.cpp`, `.hpp`, `.sh`, `.csv`, `.yaml`, `.yml`.
 
 ## Build
 
@@ -86,6 +89,7 @@ On first startup the payload installs a `PS5 Web File Manager` web shortcut in t
 - Delete is recursive and permanent. There is no recycle bin.
 - Copy/move tasks can be canceled. A partially copied single file is removed, but partially copied folders are left in place to avoid deleting existing files when merging into an existing target folder.
 - The UI can recover the active task display if the browser is closed and reopened while the payload process is still running.
+- Text editing is limited to common text-file extensions. Non-UTF-8 and oversized files are rejected.
 
 ## Credits
 

assets/index.html

@@ -29,6 +29,7 @@
       </div>
       <div class="tool-right">
         <button id="refreshBtn" data-i18n="refresh"></button>
+        <button id="newTextBtn" data-i18n="newText"></button>
         <button id="mkdirBtn" data-i18n="mkdir"></button>
       </div>
     </section>
@@ -56,6 +57,19 @@
     </footer>
   </main>
 
+  <div id="textEditorOverlay" class="text-editor-overlay" hidden>
+    <section class="text-editor-panel">
+      <div id="textEditorPath" class="text-editor-path"></div>
+      <textarea id="textEditor" class="text-editor" wrap="off" spellcheck="false"
+                autocomplete="off" autocorrect="off" autocapitalize="off"></textarea>
+      <div id="textEditorStatus" class="text-editor-status"></div>
+      <div class="text-editor-actions">
+        <button id="textEditorCloseBtn" class="secondary" data-i18n="close"></button>
+        <button id="textEditorSaveBtn" class="primary" data-i18n="save"></button>
+      </div>
+    </section>
+  </div>
+
   <div id="taskOverlay" class="task-overlay" hidden>
     <div class="task-panel">
       <div id="tasks" class="tasks"></div>

assets/lang-en.js

@@ -6,10 +6,13 @@ window.WFM_LANG = {
   rename: "Rename",
   paste: "Paste",
   cancel: "Cancel",
+  close: "Close",
+  save: "Save",
   exit: "Exit",
   exiting: "Exiting...",
   refresh: "Refresh",
   mkdir: "New Folder",
+  newText: "New Text",
   file: "File",
   dir: "Folder",
   parent: "Parent",
@@ -60,6 +63,15 @@ window.WFM_LANG = {
   tasksPollFailed: "Failed to read task status: {error}",
   renamePrompt: "New name",
   mkdirPrompt: "Folder name",
+  newTextPrompt: "Text file name",
+  creatingText: "Creating text file...",
+  createTextFailed: "Failed to create text file: {error}",
+  unsavedSaveConfirm: "The text has unsaved changes. Save before closing?\n\nCancel discards the changes and closes.",
+  loadingText: "Loading text...",
+  savingText: "Saving...",
+  textSaved: "Text saved",
+  openTextFailed: "Failed to open text: {error}",
+  saveTextFailed: "Failed to save text: {error}",
   deleteConfirm: "Delete {name}?",
   deleteConfirmRecursive: "Delete {name}?\n\nFolders will be deleted recursively.",
   activeTask: "A task is running",
@@ -82,6 +94,14 @@ window.WFM_LANG = {
   err_source_destination_same: "Source and destination are the same",
   err_destination_inside_source: "Cannot copy or move a folder inside itself",
   err_invalid_path: "Invalid path",
+  err_file_not_found: "File not found",
+  err_file_already_exists: "A file with the same name already exists",
+  err_invalid_method: "Invalid request method",
+  err_text_type_not_editable: "This file type is not supported by the text editor",
+  err_text_file_too_large: "The text file is too large. The maximum size is 1 MiB",
+  err_text_invalid_utf8: "The file is not valid UTF-8 text",
+  err_text_file_changed: "The file changed after it was opened. Close and reopen it",
+  err_text_file_not_writable: "The text file is not writable",
   err_unknown_api: "Unknown API",
   err_out_of_memory: "Out of memory",
   err_no_source_paths: "No source paths",

assets/lang-zh.js

@@ -6,10 +6,13 @@ window.WFM_LANG = {
   rename: "重命名",
   paste: "粘贴",
   cancel: "取消",
+  close: "关闭",
+  save: "保存",
   exit: "退出",
   exiting: "正在退出...",
   refresh: "刷新",
   mkdir: "新建目录",
+  newText: "新建文本",
   file: "文件",
   dir: "目录",
   parent: "上级目录",
@@ -60,6 +63,15 @@ window.WFM_LANG = {
   tasksPollFailed: "任务状态读取失败: {error}",
   renamePrompt: "新名称",
   mkdirPrompt: "目录名",
+  newTextPrompt: "文本文件名",
+  creatingText: "正在新建文本...",
+  createTextFailed: "新建文本失败: {error}",
+  unsavedSaveConfirm: "文本有未保存的修改，是否保存后关闭？\n\n取消将放弃修改并关闭。",
+  loadingText: "正在读取文本...",
+  savingText: "正在保存...",
+  textSaved: "文本已保存",
+  openTextFailed: "打开文本失败: {error}",
+  saveTextFailed: "保存文本失败: {error}",
   deleteConfirm: "确认删除 {name}？",
   deleteConfirmRecursive: "确认删除 {name}？\n\n目录会递归删除。",
   activeTask: "有任务正在执行",
@@ -82,6 +94,14 @@ window.WFM_LANG = {
   err_source_destination_same: "源和目标相同",
   err_destination_inside_source: "不能复制或移动目录到它自己的内部",
   err_invalid_path: "路径无效",
+  err_file_not_found: "文件不存在",
+  err_file_already_exists: "同名文件已存在",
+  err_invalid_method: "请求方式无效",
+  err_text_type_not_editable: "该文件类型不支持文本编辑",
+  err_text_file_too_large: "文本文件过大，最大支持 1 MiB",
+  err_text_invalid_utf8: "文件不是有效的 UTF-8 文本",
+  err_text_file_changed: "文件在打开后已发生变化，请关闭后重新打开",
+  err_text_file_not_writable: "文本文件不可写",
   err_unknown_api: "未知接口",
   err_out_of_memory: "内存不足",
   err_no_source_paths: "没有源路径",

assets/main.css

@@ -237,6 +237,20 @@ button:disabled,
   background: #402326;
 }
 
+.primary {
+  border-color: #4f9f7b;
+  background: #285943;
+}
+
+button.primary:hover {
+  background: #347358;
+}
+
+.secondary {
+  border-color: #59636e;
+  background: #20262d;
+}
+
 .paste-action {
   max-width: 480px;
 }
@@ -419,6 +433,82 @@ input[type="checkbox"] {
   color: #7f8a94;
 }
 
+.text-editor-overlay {
+  position: fixed;
+  top: 0;
+  right: 0;
+  bottom: 0;
+  left: 0;
+  z-index: 9000;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  padding: 48px;
+  background: rgba(4, 6, 8, .9);
+}
+
+.text-editor-panel {
+  width: 1200px;
+  height: calc(100vh - 96px);
+  max-width: calc(100vw - 96px);
+  display: flex;
+  flex-direction: column;
+  padding: 24px;
+  border: 1px solid #46515f;
+  border-radius: 10px;
+  background: #15191e;
+  box-shadow: 0 18px 60px rgba(0, 0, 0, .45);
+}
+
+.text-editor-path {
+  margin-bottom: 14px;
+  overflow: hidden;
+  color: #c9d3dc;
+  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
+  font-size: 20px;
+  white-space: nowrap;
+  text-overflow: ellipsis;
+}
+
+.text-editor {
+  width: 100%;
+  min-height: 0;
+  flex: 1 1 auto;
+  padding: 18px;
+  border: 1px solid #46515f;
+  border-radius: 6px;
+  outline: none;
+  resize: none;
+  background: #0f1215;
+  color: #edf0f2;
+  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
+  font-size: 20px;
+  line-height: 1.5;
+}
+
+.text-editor:focus {
+  border-color: #6fb1ff;
+}
+
+.text-editor-status {
+  min-height: 28px;
+  padding-top: 8px;
+  color: #aab4be;
+  font-size: 18px;
+}
+
+.text-editor-actions {
+  display: flex;
+}
+
+.text-editor-actions button {
+  flex: 1 1 0;
+}
+
+.text-editor-actions button + button {
+  margin-left: 14px;
+}
+
 .task-overlay {
   position: fixed;
   top: 0;

assets/main.js

@@ -10,9 +10,13 @@ let pendingAbortController = null;
 let taskRefreshPath = "/";
 let hoverPaused = false;
 let hoverResumeTimer = 0;
+let textEditorPath = null;
+let textEditorVersion = null;
+let textEditorOriginal = "";
+let textEditorBusy = false;
 let L = {};
 
-const APP_VERSION = "v0.2";
+const APP_VERSION = "v0.3";
 const LAST_PATH_KEY = "ps5-web-file-mgr:last-path";
 
 const filesEl = document.getElementById("files");
@@ -32,6 +36,13 @@ const pasteTargetTextEl = document.getElementById("pasteTargetText");
 const clearClipboardBtn = document.getElementById("clearClipboardBtn");
 const initLoadingEl = document.getElementById("initLoading");
 const exitBtn = document.getElementById("exitBtn");
+const textEditorOverlayEl = document.getElementById("textEditorOverlay");
+const textEditorPathEl = document.getElementById("textEditorPath");
+const textEditorEl = document.getElementById("textEditor");
+const textEditorStatusEl = document.getElementById("textEditorStatus");
+const textEditorCloseBtn = document.getElementById("textEditorCloseBtn");
+const textEditorSaveBtn = document.getElementById("textEditorSaveBtn");
+const newTextBtn = document.getElementById("newTextBtn");
 
 function chooseLanguage() {
   const langs = navigator.languages && navigator.languages.length ? navigator.languages : [navigator.language || ""];
@@ -88,17 +99,29 @@ function applyStaticText() {
   if (initLoadingEl) initLoadingEl.hidden = true;
 }
 
-function api(path, params, options) {
+async function request(path, params, options) {
   const qs = new URLSearchParams(params || {});
   const fetchOptions = Object.assign({ method: "POST" }, options || {});
-  return fetch(path + (qs.toString() ? "?" + qs.toString() : ""), fetchOptions)
-    .then(async response => {
-      const data = await response.json();
-      if (!response.ok || !data.ok) {
-        throw new Error(backendErrorText(data.error_code, data.error_arg, data.error));
-      }
-      return data;
-    });
+  const response = await fetch(path + (qs.toString() ? "?" + qs.toString() : ""), fetchOptions);
+  if (!response.ok) {
+    const data = await response.json();
+    throw new Error(backendErrorText(data.error_code, data.error_arg, data.error));
+  }
+  return response;
+}
+
+async function api(path, params, options) {
+  const data = await (await request(path, params, options)).json();
+  if (!data.ok) throw new Error(backendErrorText(data.error_code, data.error_arg, data.error));
+  return data;
+}
+
+async function fetchText(path, params) {
+  const response = await request(path, params, { method: "GET" });
+  return {
+    text: await response.text(),
+    version: response.headers.get("X-Text-Version") || ""
+  };
 }
 
 function formatSize(size, type) {
@@ -119,7 +142,16 @@ function formatBytes(size, decimals) {
 }
 
 function formatTime(seconds) {
-  return seconds ? new Date(seconds * 1000).toLocaleString() : "";
+  if (!seconds) return "";
+  const date = new Date(seconds * 1000);
+  const year = date.getFullYear();
+  const month = date.getMonth() + 1;
+  const day = date.getDate();
+  const time = [date.getHours(), date.getMinutes(), date.getSeconds()]
+    .map(value => value < 10 ? "0" + value : value).join(":");
+  return document.documentElement.lang === "en" ?
+    month + "/" + day + "/" + year + ", " + time :
+    year + "/" + month + "/" + day + " " + time;
 }
 
 function formatSpeed(bytes) {
@@ -277,6 +309,118 @@ function typeLabel(type) {
   return type === "d" ? t("dir") : t("file");
 }
 
+function isEditableText(item) {
+  return item.type === "-" &&
+    /\.(txt|json|xml|ini|cfg|conf|md|log|lua|js|css|html?|c|h|cpp|hpp|sh|csv|ya?ml)$/i.test(item.name);
+}
+
+function setTextEditorBusy(value, status) {
+  textEditorBusy = value;
+  textEditorEl.disabled = value;
+  textEditorCloseBtn.disabled = value;
+  textEditorSaveBtn.disabled = value;
+  textEditorStatusEl.textContent = status || "";
+}
+
+function closeTextEditor() {
+  if (textEditorBusy) return;
+  textEditorOverlayEl.hidden = true;
+  textEditorPath = null;
+  textEditorVersion = null;
+  textEditorOriginal = "";
+  textEditorEl.value = "";
+  textEditorStatusEl.textContent = "";
+  return load(cwd, false, true);
+}
+
+function requestCloseTextEditor() {
+  if (textEditorBusy) return;
+  if (textEditorEl.value !== textEditorOriginal &&
+      confirm(t("unsavedSaveConfirm"))) return saveTextEditor();
+  return closeTextEditor();
+}
+
+function showTextEditor(item, text, version) {
+  textEditorPath = item.path;
+  textEditorVersion = version;
+  textEditorPathEl.textContent = item.path;
+  textEditorPathEl.title = item.path;
+  textEditorEl.value = text;
+  textEditorOriginal = textEditorEl.value;
+  textEditorOverlayEl.hidden = false;
+  setTextEditorBusy(false, "");
+  textEditorEl.focus();
+}
+
+async function openTextEditor(item) {
+  if (busy || textEditorBusy) return;
+  textEditorPath = item.path;
+  textEditorVersion = null;
+  textEditorOriginal = "";
+  textEditorPathEl.textContent = item.path;
+  textEditorPathEl.title = item.path;
+  textEditorEl.value = "";
+  textEditorOverlayEl.hidden = false;
+  setTextEditorBusy(true, t("loadingText"));
+  try {
+    const data = await fetchText("/api/text", { path: item.path });
+    showTextEditor(item, data.text, data.version);
+  } catch (err) {
+    setTextEditorBusy(false, "");
+    textEditorOverlayEl.hidden = true;
+    textEditorPath = null;
+    const message = t("openTextFailed", { error: err.message });
+    setStatus(message);
+    alert(message);
+  }
+}
+
+async function saveTextEditor() {
+  if (textEditorBusy || !textEditorPath || !textEditorVersion) return;
+  if (textEditorEl.value === textEditorOriginal) {
+    await closeTextEditor();
+    return;
+  }
+  const path = textEditorPath;
+  setTextEditorBusy(true, t("savingText"));
+  try {
+    await api("/api/text/save", { path, version: textEditorVersion }, {
+      body: textEditorEl.value,
+      headers: { "Content-Type": "text/plain; charset=utf-8" }
+    });
+    setTextEditorBusy(false, "");
+    await closeTextEditor();
+    setStatus(t("textSaved"));
+  } catch (err) {
+    setTextEditorBusy(false, "");
+    const message = t("saveTextFailed", { error: err.message });
+    setStatus(message);
+    alert(message);
+  }
+}
+
+async function actionNewText() {
+  if (busy) return;
+  const dir = cwd;
+  const name = (prompt(t("newTextPrompt"), "") || "").trim();
+  if (!name) return;
+  const item = { name, path: pathJoin(dir, name), type: "-" };
+
+  try {
+    setBusy(true);
+    setStatus(t("creatingText"));
+    const data = await api("/api/text/create", { path: dir, name });
+    await load(dir, false, true);
+    setBusy(false);
+    showTextEditor(item, "", data.version);
+  } catch (err) {
+    setBusy(false);
+    const message = t("createTextFailed", { error: err.message });
+    setStatus(message);
+    alert(message);
+  }
+}
+
 function resetScrollTop() {
   const apply = () => {
     contentEl.scrollTop = 0;
@@ -354,6 +498,7 @@ function updateButtons() {
   document.getElementById("renameBtn").disabled = busy || items.length !== 1;
   document.getElementById("deleteBtn").disabled = busy || items.length === 0;
   document.getElementById("mkdirBtn").disabled = busy;
+  newTextBtn.disabled = busy;
   selectAllEl.checked = entries.length > 0 && items.length === entries.length;
   selectAllEl.indeterminate = items.length > 0 && items.length < entries.length;
   renderClipboard();
@@ -483,6 +628,7 @@ function render() {
     nameBtn.addEventListener("click", () => {
       focusPath(item.path);
       if (isParent || item.type === "d") load(item.path);
+      else if (isEditableText(item)) openTextEditor(item);
       else togglePath(item.path, !selected.has(item.path));
     });
     appendChildren(nameBtn, icon, nameText);
@@ -867,7 +1013,7 @@ function actionRename() {
   if (busy) return;
   const item = singleSelected();
   if (!item) return;
-  const name = prompt(t("renamePrompt"), item.name);
+  const name = (prompt(t("renamePrompt"), item.name) || "").trim();
   if (!name || name === item.name) return;
   runImmediateAction(t("rename"), () => api("/api/rename", { path: item.path, name }));
 }
@@ -896,7 +1042,7 @@ document.getElementById("refreshBtn").addEventListener("click", () => load(cwd,
 document.getElementById("mkdirBtn").addEventListener("click", () => {
   if (busy) return;
   const path = cwd;
-  const name = prompt(t("mkdirPrompt"));
+  const name = (prompt(t("mkdirPrompt")) || "").trim();
   if (!name) return;
   runImmediateAction(t("mkdir"), () => api("/api/mkdir", { path, name }));
 });
@@ -907,6 +1053,9 @@ clearClipboardBtn.addEventListener("click", clearClipboard);
 document.getElementById("renameBtn").addEventListener("click", actionRename);
 document.getElementById("deleteBtn").addEventListener("click", actionDelete);
 exitBtn.addEventListener("click", actionExit);
+textEditorCloseBtn.addEventListener("click", requestCloseTextEditor);
+textEditorSaveBtn.addEventListener("click", saveTextEditor);
+newTextBtn.addEventListener("click", actionNewText);
 selectAllEl.addEventListener("change", () => {
   selected.clear();
   if (selectAllEl.checked) entries.forEach(item => selected.add(item.path));

src/filemgr.c

@@ -1,5 +1,6 @@
 #include "filemgr.h"
 
+#include <ctype.h>
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
@@ -9,6 +10,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 #include <sys/stat.h>
 #include <sys/statvfs.h>
 #include <sys/types.h>
@@ -24,6 +26,7 @@
 #include "websrv.h"
 
 #define COPY_BUFFER_SIZE (8 * 1024 * 1024)
+#define TEXT_FILE_MAX_SIZE (1024 * 1024)
 typedef struct strbuf {
   char *data;
   size_t len;
@@ -131,7 +134,18 @@ strbuf_printf(strbuf_t *b, const char *fmt, ...) {
 static char *
 query_value(struct MHD_Connection *conn, const char *key) {
   const char *raw = MHD_lookup_connection_value(conn, MHD_GET_ARGUMENT_KIND, key);
-  return raw ? strdup(raw) : NULL;
+  char *value = raw ? strdup(raw) : NULL;
+
+  if(value && !strcmp(key, "name")) {
+    char *start = value;
+    char *end;
+    while(isspace((unsigned char)*start)) start++;
+    end = start + strlen(start);
+    while(end > start && isspace((unsigned char)end[-1])) end--;
+    memmove(value, start, (size_t)(end - start));
+    value[end - start] = 0;
+  }
+  return value;
 }
 
 static void
@@ -484,6 +498,16 @@ send_json_ok(struct MHD_Connection *conn) {
                      "application/json");
 }
 
+static enum MHD_Result
+send_json_version(struct MHD_Connection *conn, unsigned long long version) {
+  char *data;
+
+  if(asprintf(&data, "{\"ok\":true,\"version\":\"%016llx\"}", version) < 0) {
+    return MHD_NO;
+  }
+  return send_buffer(conn, MHD_HTTP_OK, data, "application/json");
+}
+
 static const char *
 api_error_code(const char *msg) {
   if(!msg) return "system_error";
@@ -492,9 +516,17 @@ api_error_code(const char *msg) {
   if(!strcmp(msg, "source and destination are the same")) return "source_destination_same";
   if(!strcmp(msg, "destination is inside source directory")) return "destination_inside_source";
   if(!strcmp(msg, "invalid path")) return "invalid_path";
+  if(!strcmp(msg, "file not found")) return "file_not_found";
+  if(!strcmp(msg, "invalid method")) return "invalid_method";
   if(!strcmp(msg, "unknown api")) return "unknown_api";
   if(!strcmp(msg, "out of memory")) return "out_of_memory";
   if(!strcmp(msg, "no source paths")) return "no_source_paths";
+  if(!strcmp(msg, "file type is not editable")) return "text_type_not_editable";
+  if(!strcmp(msg, "text file is too large")) return "text_file_too_large";
+  if(!strcmp(msg, "file is not valid UTF-8")) return "text_invalid_utf8";
+  if(!strcmp(msg, "file changed since it was opened")) return "text_file_changed";
+  if(!strcmp(msg, "text file is not writable")) return "text_file_not_writable";
+  if(!strcmp(msg, "file already exists")) return "file_already_exists";
   if(!strcmp(msg, "destination must be a directory for multiple items")) {
     return "destination_must_be_directory";
   }
@@ -517,6 +549,222 @@ send_json_error(struct MHD_Connection *conn, unsigned int status,
   return send_buffer(conn, status, b.data, "application/json");
 }
 
+static int
+text_extension_allowed(const char *path) {
+  static const char *extensions[] = {
+    ".txt", ".json", ".xml", ".ini", ".cfg", ".conf", ".md",
+    ".log", ".lua", ".js", ".css", ".html", ".htm", ".c", ".h",
+    ".cpp", ".hpp", ".sh", ".csv", ".yaml", ".yml"
+  };
+  const char *extension = strrchr(path, '.');
+  size_t i;
+
+  if(!extension) {
+    return 0;
+  }
+  for(i = 0; i < sizeof(extensions) / sizeof(extensions[0]); i++) {
+    if(!strcasecmp(extension, extensions[i])) {
+      return 1;
+    }
+  }
+  return 0;
+}
+
+static int
+valid_utf8(const unsigned char *data, size_t size) {
+  size_t i = 0;
+
+  while(i < size) {
+    unsigned char c = data[i++];
+    size_t trailing;
+    unsigned int codepoint;
+
+    if(!c) return 0;
+    if(c < 0x80) continue;
+    if(c >= 0xc2 && c <= 0xdf) {
+      trailing = 1;
+      codepoint = c & 0x1f;
+    } else if(c >= 0xe0 && c <= 0xef) {
+      trailing = 2;
+      codepoint = c & 0x0f;
+    } else if(c >= 0xf0 && c <= 0xf4) {
+      trailing = 3;
+      codepoint = c & 0x07;
+    } else {
+      return 0;
+    }
+    if(trailing > size - i) return 0;
+    while(trailing--) {
+      unsigned char next = data[i++];
+      if((next & 0xc0) != 0x80) return 0;
+      codepoint = (codepoint << 6) | (next & 0x3f);
+    }
+    if((codepoint >= 0xd800 && codepoint <= 0xdfff) || codepoint > 0x10ffff ||
+       (codepoint < 0x800 && c >= 0xe0) ||
+       (codepoint < 0x10000 && c >= 0xf0)) {
+      return 0;
+    }
+  }
+  return 1;
+}
+
+static unsigned long long
+text_version(const unsigned char *data, size_t size) {
+  unsigned long long hash = 1469598103934665603ULL;
+  size_t i;
+
+  for(i = 0; i < size; i++) {
+    hash ^= data[i];
+    hash *= 1099511628211ULL;
+  }
+  return hash;
+}
+
+typedef enum text_newline {
+  TEXT_NEWLINE_LF,
+  TEXT_NEWLINE_CRLF,
+  TEXT_NEWLINE_CR,
+} text_newline_t;
+
+static text_newline_t
+detect_text_newline(const unsigned char *data, size_t size) {
+  size_t crlf = 0;
+  size_t lf = 0;
+  size_t cr = 0;
+  size_t i;
+
+  for(i = 0; i < size; i++) {
+    if(data[i] == '\r') {
+      if(i + 1 < size && data[i + 1] == '\n') {
+        crlf++;
+        i++;
+      } else {
+        cr++;
+      }
+    } else if(data[i] == '\n') {
+      lf++;
+    }
+  }
+  if(crlf > lf && crlf >= cr) return TEXT_NEWLINE_CRLF;
+  if(cr > lf && cr > crlf) return TEXT_NEWLINE_CR;
+  return TEXT_NEWLINE_LF;
+}
+
+static int
+format_text_for_save(const char *body, size_t body_size,
+                     const unsigned char *current, size_t current_size,
+                     char **output, size_t *output_size) {
+  static const unsigned char bom[] = {0xef, 0xbb, 0xbf};
+  int keep_bom = current_size >= sizeof(bom) &&
+                 !memcmp(current, bom, sizeof(bom));
+  text_newline_t newline = detect_text_newline(
+    current + (keep_bom ? sizeof(bom) : 0),
+    current_size - (keep_bom ? sizeof(bom) : 0));
+  const unsigned char *input = (const unsigned char *)(body ? body : "");
+  size_t input_size = body_size;
+  size_t capacity = body_size * (newline == TEXT_NEWLINE_CRLF ? 2 : 1) +
+                    sizeof(bom) + 1;
+  char *formatted;
+  size_t i;
+  size_t len = 0;
+
+  if(input_size >= sizeof(bom) && !memcmp(input, bom, sizeof(bom))) {
+    input += sizeof(bom);
+    input_size -= sizeof(bom);
+  }
+  if(!(formatted = malloc(capacity))) {
+    errno = ENOMEM;
+    return -1;
+  }
+  if(keep_bom) {
+    memcpy(formatted + len, bom, sizeof(bom));
+    len += sizeof(bom);
+  }
+  for(i = 0; i < input_size; i++) {
+    unsigned char c = input[i];
+
+    if(c != '\r' && c != '\n') {
+      formatted[len++] = (char)c;
+      continue;
+    }
+    if(c == '\r' && i + 1 < input_size && input[i + 1] == '\n') {
+      i++;
+    }
+    if(newline == TEXT_NEWLINE_CRLF) {
+      formatted[len++] = '\r';
+      formatted[len++] = '\n';
+    } else {
+      formatted[len++] = newline == TEXT_NEWLINE_CR ? '\r' : '\n';
+    }
+  }
+  if(len > TEXT_FILE_MAX_SIZE) {
+    free(formatted);
+    errno = EFBIG;
+    return -1;
+  }
+  formatted[len] = 0;
+  *output = formatted;
+  *output_size = len;
+  return 0;
+}
+
+static int
+read_text_file(const char *path, char **data, size_t *size,
+               struct stat *st) {
+  FILE *file;
+  size_t read_size;
+
+  *data = NULL;
+  *size = 0;
+  if(lstat(path, st) || !S_ISREG(st->st_mode)) {
+    return -1;
+  }
+  if(st->st_size < 0 || (unsigned long long)st->st_size > TEXT_FILE_MAX_SIZE) {
+    errno = EFBIG;
+    return -1;
+  }
+  if(!(file = fopen(path, "rb"))) {
+    return -1;
+  }
+  if(!(*data = malloc((size_t)st->st_size + 1))) {
+    fclose(file);
+    errno = ENOMEM;
+    return -1;
+  }
+  read_size = fread(*data, 1, (size_t)st->st_size, file);
+  if(read_size != (size_t)st->st_size || ferror(file)) {
+    free(*data);
+    *data = NULL;
+    fclose(file);
+    return -1;
+  }
+  fclose(file);
+  (*data)[read_size] = 0;
+  *size = read_size;
+  return 0;
+}
+
+static enum MHD_Result
+send_text_file(struct MHD_Connection *conn, char *data, size_t size,
+               unsigned long long version) {
+  struct MHD_Response *resp;
+  enum MHD_Result ret;
+  char version_text[24];
+
+  if(!(resp = MHD_create_response_from_buffer(size, data,
+                                               MHD_RESPMEM_MUST_FREE))) {
+    free(data);
+    return MHD_NO;
+  }
+  snprintf(version_text, sizeof(version_text), "%016llx", version);
+  MHD_add_response_header(resp, MHD_HTTP_HEADER_CONTENT_TYPE,
+                          "text/plain; charset=utf-8");
+  MHD_add_response_header(resp, "X-Text-Version", version_text);
+  ret = websrv_queue_response(conn, MHD_HTTP_OK, resp);
+  MHD_destroy_response(resp);
+  return ret;
+}
+
 static int count_path_bytes(file_task_t *task, const char *path,
                             const char *display,
                             unsigned long long *total);
@@ -1906,8 +2154,210 @@ api_mkdir(struct MHD_Connection *conn) {
              : send_json_ok(conn);
 }
 
+static enum MHD_Result
+api_text(struct MHD_Connection *conn) {
+  char *path = query_value(conn, "path");
+  char *data;
+  size_t size;
+  struct stat st;
+  unsigned long long version;
+
+  if(has_active_task()) {
+    free(path);
+    return send_json_error(conn, MHD_HTTP_CONFLICT, "another task is running");
+  }
+  if(!path || !text_extension_allowed(path)) {
+    free(path);
+    return send_json_error(conn, MHD_HTTP_BAD_REQUEST,
+                           "file type is not editable");
+  }
+  if(read_text_file(path, &data, &size, &st)) {
+    int error = errno;
+    free(path);
+    if(error == EFBIG) {
+      return send_json_error(conn, MHD_HTTP_CONTENT_TOO_LARGE,
+                             "text file is too large");
+    }
+    errno = error;
+    return send_json_error(conn, MHD_HTTP_NOT_FOUND, "file not found");
+  }
+  free(path);
+  if(!valid_utf8((const unsigned char *)data, size)) {
+    free(data);
+    return send_json_error(conn, MHD_HTTP_UNSUPPORTED_MEDIA_TYPE,
+                           "file is not valid UTF-8");
+  }
+  version = text_version((const unsigned char *)data, size);
+  return send_text_file(conn, data, size, version);
+}
+
+static enum MHD_Result
+api_text_create(struct MHD_Connection *conn) {
+  char *path = query_value(conn, "path");
+  char *name = query_value(conn, "name");
+  char target[PATH_MAX];
+  int fd = -1;
+  int ret = -1;
+  int error = 0;
+  int created = 0;
+
+  if(has_active_task()) {
+    free(path); free(name);
+    return send_json_error(conn, MHD_HTTP_CONFLICT, "another task is running");
+  }
+  if(!path || !name || path_join(target, sizeof(target), path, name)) {
+    free(path); free(name);
+    return send_json_error(conn, MHD_HTTP_BAD_REQUEST, "invalid path");
+  }
+  if(access(path, W_OK | X_OK)) {
+    free(path); free(name);
+    return send_json_error(conn, MHD_HTTP_FORBIDDEN,
+                           "text file is not writable");
+  }
+  if((fd = open(target, O_WRONLY | O_CREAT | O_EXCL, 0777)) >= 0) {
+    created = 1;
+    ret = fchmod_0777(fd);
+    if(close(fd) && !ret) ret = -1;
+    fd = -1;
+  }
+  if(ret) {
+    error = errno;
+    if(fd >= 0) close(fd);
+    if(created) unlink(target);
+  }
+  free(path); free(name);
+  if(!ret) {
+    return send_json_version(conn,
+                             text_version((const unsigned char *)"", 0));
+  }
+  errno = error;
+  return error == EEXIST ?
+    send_json_error(conn, MHD_HTTP_CONFLICT, "file already exists") :
+    send_json_error(conn, MHD_HTTP_INTERNAL_SERVER_ERROR, NULL);
+}
+
+static int
+write_text_atomic(const char *path, const char *body, size_t body_size,
+                  mode_t mode) {
+  struct timespec now;
+  char temp[PATH_MAX];
+  size_t written = 0;
+  int fd = -1;
+  int ret = -1;
+  int n;
+
+  clock_gettime(CLOCK_MONOTONIC, &now);
+  n = snprintf(temp, sizeof(temp), "%s.wfm-%ld-%ld.tmp", path,
+               (long)getpid(), now.tv_nsec);
+  if(n < 0 || (size_t)n >= sizeof(temp)) {
+    errno = ENAMETOOLONG;
+    return -1;
+  }
+  if((fd = open(temp, O_WRONLY | O_CREAT | O_EXCL, 0600)) < 0) {
+    return -1;
+  }
+  while(written < body_size) {
+    ssize_t count = write(fd, body + written, body_size - written);
+    if(count <= 0) {
+      goto done;
+    }
+    written += (size_t)count;
+  }
+  if(fchmod(fd, mode & 07777) && !ignore_chmod_error(errno)) {
+    goto done;
+  }
+  if(fsync(fd)) {
+    goto done;
+  }
+  if(close(fd)) {
+    fd = -1;
+    goto done;
+  }
+  fd = -1;
+  if(rename(temp, path)) {
+    goto done;
+  }
+  ret = 0;
+
+done:
+  if(fd >= 0) close(fd);
+  if(ret) unlink(temp);
+  return ret;
+}
+
+static enum MHD_Result
+api_text_save(struct MHD_Connection *conn, const char *body,
+              size_t body_size) {
+  char *path = query_value(conn, "path");
+  char *expected = query_value(conn, "version");
+  char *current = NULL;
+  size_t current_size = 0;
+  struct stat st;
+  char version_text[24];
+  char parent[PATH_MAX];
+  char *formatted = NULL;
+  size_t formatted_size = 0;
+  int ret;
+
+  if(has_active_task()) {
+    free(path); free(expected);
+    return send_json_error(conn, MHD_HTTP_CONFLICT, "another task is running");
+  }
+  if(!path || !expected) {
+    free(path); free(expected);
+    return send_json_error(conn, MHD_HTTP_BAD_REQUEST, "invalid path");
+  }
+  if(body_size > TEXT_FILE_MAX_SIZE) {
+    free(path); free(expected);
+    return send_json_error(conn, MHD_HTTP_CONTENT_TOO_LARGE,
+                           "text file is too large");
+  }
+  if(!valid_utf8((const unsigned char *)(body ? body : ""), body_size)) {
+    free(path); free(expected);
+    return send_json_error(conn, MHD_HTTP_UNSUPPORTED_MEDIA_TYPE,
+                           "file is not valid UTF-8");
+  }
+  if(read_text_file(path, &current, &current_size, &st)) {
+    free(path); free(expected);
+    return send_json_error(conn, MHD_HTTP_NOT_FOUND, "file not found");
+  }
+  snprintf(version_text, sizeof(version_text), "%016llx",
+           text_version((const unsigned char *)current, current_size));
+  if(strcmp(expected, version_text)) {
+    free(current);
+    free(path); free(expected);
+    return send_json_error(conn, MHD_HTTP_CONFLICT,
+                           "file changed since it was opened");
+  }
+  if(path_dirname(path, parent, sizeof(parent)) ||
+     access(path, W_OK) || access(parent, W_OK | X_OK)) {
+    free(current);
+    free(path); free(expected);
+    return send_json_error(conn, MHD_HTTP_FORBIDDEN,
+                           "text file is not writable");
+  }
+  if(format_text_for_save(body, body_size, (const unsigned char *)current,
+                          current_size, &formatted, &formatted_size)) {
+    int error = errno;
+    free(current);
+    free(path); free(expected);
+    errno = error;
+    return error == EFBIG ?
+      send_json_error(conn, MHD_HTTP_CONTENT_TOO_LARGE,
+                      "text file is too large") :
+      send_json_error(conn, MHD_HTTP_INTERNAL_SERVER_ERROR, NULL);
+  }
+  free(current);
+  ret = write_text_atomic(path, formatted, formatted_size, st.st_mode);
+  free(formatted);
+  free(path); free(expected);
+  return ret ? send_json_error(conn, MHD_HTTP_INTERNAL_SERVER_ERROR, NULL)
+             : send_json_ok(conn);
+}
+
 enum MHD_Result
-filemgr_api_request(struct MHD_Connection *conn, const char *url) {
+filemgr_api_request(struct MHD_Connection *conn, const char *url,
+                    const char *method, const char *body, size_t body_size) {
   if(!strcmp(url, "/api/list")) return api_list(conn);
   if(!strcmp(url, "/api/tasks")) return api_tasks(conn);
   if(!strcmp(url, "/api/space")) return api_space(conn);
@@ -1918,6 +2368,21 @@ filemgr_api_request(struct MHD_Connection *conn, const char *url) {
   if(!strcmp(url, "/api/delete")) return api_delete(conn);
   if(!strcmp(url, "/api/rename")) return api_rename(conn);
   if(!strcmp(url, "/api/mkdir")) return api_mkdir(conn);
+  if(!strcmp(url, "/api/text")) {
+    return strcmp(method, MHD_HTTP_METHOD_GET) ?
+      send_json_error(conn, MHD_HTTP_METHOD_NOT_ALLOWED, "invalid method") :
+      api_text(conn);
+  }
+  if(!strcmp(url, "/api/text/create")) {
+    return strcmp(method, MHD_HTTP_METHOD_POST) ?
+      send_json_error(conn, MHD_HTTP_METHOD_NOT_ALLOWED, "invalid method") :
+      api_text_create(conn);
+  }
+  if(!strcmp(url, "/api/text/save")) {
+    return strcmp(method, MHD_HTTP_METHOD_POST) ?
+      send_json_error(conn, MHD_HTTP_METHOD_NOT_ALLOWED, "invalid method") :
+      api_text_save(conn, body, body_size);
+  }
   return send_json_error(conn, MHD_HTTP_NOT_FOUND, "unknown api");
 }
 

src/filemgr.h

@@ -3,5 +3,6 @@
 #include <microhttpd.h>
 
 enum MHD_Result filemgr_api_request(struct MHD_Connection *conn,
-                                    const char *url);
+                                    const char *url, const char *method,
+                                    const char *body, size_t body_size);
 enum MHD_Result filemgr_fs_request(struct MHD_Connection *conn);

src/websrv.c

@@ -13,6 +13,34 @@
 #include "filemgr.h"
 #include "websrv.h"
 
+#define REQUEST_BODY_MAX (1024 * 1024)
+
+typedef struct request_context {
+  char *body;
+  size_t size;
+  int too_large;
+} request_context_t;
+
+static enum MHD_Result
+websrv_body_too_large(struct MHD_Connection *conn) {
+  static const char json[] =
+    "{\"ok\":false,\"error\":\"request body is too large\","
+    "\"error_code\":\"text_file_too_large\",\"error_arg\":\"\"}";
+  struct MHD_Response *resp =
+    MHD_create_response_from_buffer(sizeof(json) - 1, (void *)json,
+                                    MHD_RESPMEM_PERSISTENT);
+  enum MHD_Result ret;
+
+  if(!resp) {
+    return MHD_NO;
+  }
+  MHD_add_response_header(resp, MHD_HTTP_HEADER_CONTENT_TYPE,
+                          "application/json");
+  ret = websrv_queue_response(conn, MHD_HTTP_CONTENT_TOO_LARGE, resp);
+  MHD_destroy_response(resp);
+  return ret;
+}
+
 enum MHD_Result
 websrv_queue_response(struct MHD_Connection *conn, unsigned int status,
                       struct MHD_Response *resp) {
@@ -26,10 +54,9 @@ websrv_on_request(void *cls, struct MHD_Connection *conn, const char *url,
                   const char *method, const char *version,
                   const char *upload_data, size_t *upload_data_size,
                   void **con_cls) {
+  request_context_t *ctx = *con_cls;
   (void)cls;
   (void)version;
-  (void)upload_data;
-  (void)upload_data_size;
 
   if(strcmp(method, MHD_HTTP_METHOD_GET) &&
      strcmp(method, MHD_HTTP_METHOD_POST) &&
@@ -37,13 +64,39 @@ websrv_on_request(void *cls, struct MHD_Connection *conn, const char *url,
     return MHD_NO;
   }
 
-  if(!*con_cls) {
-    *con_cls = (void *)1;
+  if(!ctx) {
+    if(!(ctx = calloc(1, sizeof(*ctx)))) {
+      return MHD_NO;
+    }
+    *con_cls = ctx;
     return MHD_YES;
   }
 
+  if(*upload_data_size) {
+    size_t chunk_size = *upload_data_size;
+
+    if(chunk_size > REQUEST_BODY_MAX - ctx->size) {
+      ctx->too_large = 1;
+    } else if(!ctx->too_large) {
+      char *body = realloc(ctx->body, ctx->size + chunk_size + 1);
+      if(!body) {
+        return MHD_NO;
+      }
+      ctx->body = body;
+      memcpy(ctx->body + ctx->size, upload_data, chunk_size);
+      ctx->size += chunk_size;
+      ctx->body[ctx->size] = 0;
+    }
+    *upload_data_size = 0;
+    return MHD_YES;
+  }
+
+  if(ctx->too_large) {
+    return websrv_body_too_large(conn);
+  }
+
   if(!strncmp(url, "/api/", 5)) {
-    return filemgr_api_request(conn, url);
+    return filemgr_api_request(conn, url, method, ctx->body, ctx->size);
   }
   if(!strcmp(url, "/fs")) {
     return filemgr_fs_request(conn);
@@ -60,6 +113,12 @@ websrv_on_completed(void *cls, struct MHD_Connection *connection,
   (void)cls;
   (void)connection;
   (void)toe;
+  request_context_t *ctx = *con_cls;
+
+  if(ctx) {
+    free(ctx->body);
+    free(ctx);
+  }
   *con_cls = NULL;
 }