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367 lines
14 KiB
367 lines
14 KiB
// Package web provides the login-gated HTTP surface for the application.
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package web
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import (
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"errors"
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"html/template"
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"net/http"
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"net/url"
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"path"
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"strconv"
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"strings"
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"time"
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"webfilebrowser/internal/auth"
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"webfilebrowser/internal/browser"
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"webfilebrowser/internal/config"
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)
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const (
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loginPath = "/login"
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logoutPath = "/logout"
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changePasswordPath = "/change-password"
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browsePath = "/browse"
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sessionCookieName = "webfilebrowser_session"
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)
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var (
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loginTemplate = template.Must(template.New("login").Parse(`<!doctype html>
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<html lang="en"><head><meta charset="utf-8"><title>Sign in</title></head>
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<body><main><h1>Sign in</h1>{{if .Error}}<p role="alert">{{.Error}}</p>{{end}}
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<form method="post" action="/login"><label>Email <input type="email" name="email" required></label>
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<label>Password <input type="password" name="password" required></label><button type="submit">Sign in</button></form></main></body></html>`))
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changePasswordTemplate = template.Must(template.New("change-password").Parse(`<!doctype html>
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<html lang="en"><head><meta charset="utf-8"><title>Change password</title></head>
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<body><main><h1>Change your password</h1><p>You must choose a new password before continuing.</p>{{if .Error}}<p role="alert">{{.Error}}</p>{{end}}
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<form method="post" action="/change-password"><label>Current password <input type="password" name="current_password" required></label>
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<label>New password <input type="password" name="new_password" required></label><button type="submit">Change password</button></form></main></body></html>`))
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rootsTemplate = template.Must(template.New("roots").Parse(pageStart + `
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<main><header><h1>webFileBrowser</h1><button id="theme-toggle" type="button">Toggle theme</button></header>
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<p>Signed in as {{.UserEmail}}.</p><h2>Roots</h2><ul class="roots">{{range .Roots}}<li><a href="{{.URL}}">{{.Name}}</a></li>{{else}}<li>No roots are configured.</li>{{end}}</ul>` + signOutForm + pageEnd))
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directoryTemplate = template.Must(template.New("directory").Parse(pageStart + `
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<main><header><h1>webFileBrowser</h1><button id="theme-toggle" type="button">Toggle theme</button></header>
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<p>Signed in as {{.UserEmail}}.</p><nav aria-label="Breadcrumb"><ol class="breadcrumbs">{{range .Breadcrumbs}}<li><a href="{{.URL}}">{{.Name}}</a></li>{{end}}</ol></nav>
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<table><thead><tr><th>Name</th><th>Type</th><th>Size</th><th>Modified</th></tr></thead><tbody>{{range .Entries}}<tr><td>{{if .URL}}<a href="{{.URL}}">{{.Name}}</a>{{else}}{{.Name}}{{end}}</td><td>{{.Type}}</td><td>{{.Size}}</td><td>{{.Modified}}</td></tr>{{else}}<tr><td colspan="4">This folder is empty.</td></tr>{{end}}</tbody></table>` + signOutForm + pageEnd))
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)
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const pageStart = `<!doctype html><html lang="en" data-theme="light"><head><meta charset="utf-8"><title>webFileBrowser</title><style>
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:root{color-scheme:light;--background:#f6f7fb;--surface:#fff;--text:#202534;--muted:#5d6577;--border:#d7dce8;--link:#2251b5}:root[data-theme="dark"]{color-scheme:dark;--background:#151821;--surface:#202532;--text:#f1f4fb;--muted:#b7c0d2;--border:#3c465b;--link:#9ec0ff}*{box-sizing:border-box}body{margin:0;background:var(--background);color:var(--text);font:16px system-ui,sans-serif}main{max-width:960px;margin:2rem auto;padding:2rem;background:var(--surface);border:1px solid var(--border);border-radius:12px}header{display:flex;justify-content:space-between;align-items:center;gap:1rem}h1{margin:0}a{color:var(--link)}button{font:inherit;padding:.45rem .75rem}table{width:100%;border-collapse:collapse}th,td{padding:.7rem;text-align:left;border-bottom:1px solid var(--border)}.roots,.breadcrumbs{padding-left:1.2rem}.breadcrumbs{display:flex;gap:.5rem;flex-wrap:wrap}.breadcrumbs li+li:before{content:"/";margin-right:.5rem;color:var(--muted)}form{margin-top:1.5rem}</style></head><body>`
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const signOutForm = `<form method="post" action="/logout"><button type="submit">Sign out</button></form>`
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const pageEnd = `<script>
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(() => {
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const key = "webfilebrowser-theme";
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const button = document.getElementById("theme-toggle");
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const apply = (theme) => {
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document.documentElement.dataset.theme = theme;
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button.textContent = theme === "dark" ? "Use light theme" : "Use dark theme";
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};
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const saved = localStorage.getItem(key);
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apply(saved === "dark" ? "dark" : "light");
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button.addEventListener("click", () => {
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const next = document.documentElement.dataset.theme === "dark" ? "light" : "dark";
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localStorage.setItem(key, next);
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apply(next);
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});
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})();
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</script></body></html>`
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// New returns an HTTP handler that requires a valid server-side session for
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// every route other than the login endpoint.
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func New(store *auth.Store, roots ...config.Root) http.Handler {
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fileBrowser, err := browser.New(roots)
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return &application{store: store, browser: fileBrowser, browserError: err}
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}
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type application struct {
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store *auth.Store
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browser *browser.Browser
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browserError error
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}
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func (app *application) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
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if request.URL.Path == loginPath {
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app.handleLogin(writer, request)
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return
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}
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user, token, ok := app.currentUser(writer, request)
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if !ok {
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return
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}
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if request.URL.Path == logoutPath {
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app.handleLogout(writer, request, token)
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return
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}
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if user.MustChangePassword {
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if request.URL.Path != changePasswordPath {
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http.Redirect(writer, request, changePasswordPath, http.StatusSeeOther)
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return
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}
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app.handleChangePassword(writer, request, user)
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return
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}
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if request.URL.Path == changePasswordPath {
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http.Redirect(writer, request, "/", http.StatusSeeOther)
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return
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}
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switch request.URL.Path {
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case "/":
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app.handleRoots(writer, request, user)
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case browsePath:
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app.handleBrowse(writer, request, user)
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default:
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http.NotFound(writer, request)
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}
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}
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func (app *application) handleLogin(writer http.ResponseWriter, request *http.Request) {
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switch request.Method {
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case http.MethodGet:
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renderLogin(writer, http.StatusOK, "")
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case http.MethodPost:
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if err := request.ParseForm(); err != nil {
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renderLogin(writer, http.StatusBadRequest, "Unable to read sign-in details.")
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return
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}
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user, err := app.store.Authenticate(request.FormValue("email"), request.FormValue("password"))
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if err != nil {
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renderLogin(writer, http.StatusUnauthorized, "Invalid email or password.")
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return
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}
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token, err := app.store.CreateSession(user.ID)
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if err != nil {
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http.Error(writer, "Unable to create session.", http.StatusInternalServerError)
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return
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}
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app.setSessionCookie(writer, token)
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destination := "/"
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if user.MustChangePassword {
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destination = changePasswordPath
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}
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http.Redirect(writer, request, destination, http.StatusSeeOther)
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default:
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writer.Header().Set("Allow", http.MethodGet+", "+http.MethodPost)
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http.Error(writer, "Method not allowed.", http.StatusMethodNotAllowed)
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}
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}
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func (app *application) handleChangePassword(writer http.ResponseWriter, request *http.Request, user auth.User) {
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switch request.Method {
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case http.MethodGet:
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renderChangePassword(writer, http.StatusOK, "")
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case http.MethodPost:
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if err := request.ParseForm(); err != nil {
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renderChangePassword(writer, http.StatusBadRequest, "Unable to read password details.")
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return
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}
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err := app.store.ChangePassword(user.ID, request.FormValue("current_password"), request.FormValue("new_password"))
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if errors.Is(err, auth.ErrPasswordUnchanged) {
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renderChangePassword(writer, http.StatusBadRequest, "Your new password must differ from the current password.")
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return
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}
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if errors.Is(err, auth.ErrInvalidCredentials) {
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renderChangePassword(writer, http.StatusBadRequest, "Your current password is incorrect.")
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return
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}
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if err != nil {
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http.Error(writer, "Unable to change password.", http.StatusInternalServerError)
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return
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}
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http.Redirect(writer, request, "/", http.StatusSeeOther)
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default:
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writer.Header().Set("Allow", http.MethodGet+", "+http.MethodPost)
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http.Error(writer, "Method not allowed.", http.StatusMethodNotAllowed)
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}
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}
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func (app *application) handleLogout(writer http.ResponseWriter, request *http.Request, token string) {
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if request.Method != http.MethodPost {
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methodNotAllowed(writer, http.MethodPost)
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return
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}
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if err := app.store.DeleteSession(token); err != nil {
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http.Error(writer, "Unable to end session.", http.StatusInternalServerError)
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return
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}
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app.clearSessionCookie(writer)
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http.Redirect(writer, request, loginPath, http.StatusSeeOther)
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}
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func (app *application) handleRoots(writer http.ResponseWriter, request *http.Request, user auth.User) {
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if request.Method != http.MethodGet {
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methodNotAllowed(writer, http.MethodGet)
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return
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}
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if app.browserError != nil {
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http.Error(writer, "Unable to load configured roots.", http.StatusInternalServerError)
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return
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}
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roots := make([]rootLink, 0, len(app.browser.Roots()))
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for _, root := range app.browser.Roots() {
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roots = append(roots, rootLink{Name: root.Name, URL: browseURL(root.Name, "")})
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}
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renderTemplate(writer, rootsTemplate, rootPage{UserEmail: user.Email, Roots: roots})
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}
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func (app *application) handleBrowse(writer http.ResponseWriter, request *http.Request, user auth.User) {
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if request.Method != http.MethodGet {
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methodNotAllowed(writer, http.MethodGet)
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return
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}
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if app.browserError != nil {
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http.Error(writer, "Unable to load configured roots.", http.StatusInternalServerError)
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return
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}
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directory, err := app.browser.List(request.URL.Query().Get("root"), request.URL.Query().Get("path"))
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if errors.Is(err, browser.ErrRootNotFound) || errors.Is(err, browser.ErrPathOutsideRoot) || errors.Is(err, browser.ErrDirectoryNotFound) {
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http.NotFound(writer, request)
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return
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}
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if err != nil {
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http.Error(writer, "Unable to read folder.", http.StatusInternalServerError)
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return
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}
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entries := make([]directoryEntry, 0, len(directory.Entries))
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for _, entry := range directory.Entries {
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entryView := directoryEntry{
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Name: entry.Name,
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Type: "File",
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Size: formatSize(entry.Size),
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Modified: entry.ModifiedAt.Local().Format("2006-01-02 15:04"),
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}
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if entry.IsDirectory {
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entryView.Type = "Folder"
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entryView.URL = browseURL(directory.Root.Name, joinRelativePath(directory.RelativePath, entry.Name))
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}
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entries = append(entries, entryView)
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}
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renderTemplate(writer, directoryTemplate, directoryPage{
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UserEmail: user.Email,
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Breadcrumbs: breadcrumbLinks(directory.Root.Name, directory.RelativePath),
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Entries: entries,
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})
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}
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func (app *application) currentUser(writer http.ResponseWriter, request *http.Request) (auth.User, string, bool) {
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cookie, err := request.Cookie(sessionCookieName)
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if err != nil {
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http.Redirect(writer, request, loginPath, http.StatusSeeOther)
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return auth.User{}, "", false
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}
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user, err := app.store.LookupSession(cookie.Value)
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if err != nil {
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app.clearSessionCookie(writer)
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http.Redirect(writer, request, loginPath, http.StatusSeeOther)
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return auth.User{}, "", false
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}
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app.setSessionCookie(writer, cookie.Value)
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return user, cookie.Value, true
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}
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func (app *application) setSessionCookie(writer http.ResponseWriter, token string) {
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http.SetCookie(writer, &http.Cookie{
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Name: sessionCookieName,
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Value: token,
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Path: "/",
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Expires: time.Now().Add(app.store.SessionLifetime()),
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HttpOnly: true,
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Secure: true,
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SameSite: http.SameSiteLaxMode,
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})
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}
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func (app *application) clearSessionCookie(writer http.ResponseWriter) {
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http.SetCookie(writer, &http.Cookie{
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Name: sessionCookieName,
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Value: "",
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Path: "/",
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MaxAge: -1,
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HttpOnly: true,
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Secure: true,
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SameSite: http.SameSiteLaxMode,
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})
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}
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type rootPage struct {
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UserEmail string
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Roots []rootLink
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}
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type rootLink struct {
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Name string
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URL string
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}
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type directoryPage struct {
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UserEmail string
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Breadcrumbs []rootLink
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Entries []directoryEntry
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}
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type directoryEntry struct {
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Name string
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URL string
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Type string
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Size string
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Modified string
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}
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func browseURL(rootName, relativePath string) string {
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query := url.Values{"root": {rootName}}
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if relativePath != "" {
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query.Set("path", relativePath)
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}
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return browsePath + "?" + query.Encode()
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}
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func breadcrumbLinks(rootName, relativePath string) []rootLink {
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breadcrumbs := []rootLink{{Name: rootName, URL: browseURL(rootName, "")}}
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pathSoFar := ""
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for _, part := range strings.Split(relativePath, "/") {
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if part == "" {
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continue
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}
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pathSoFar = joinRelativePath(pathSoFar, part)
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breadcrumbs = append(breadcrumbs, rootLink{Name: part, URL: browseURL(rootName, pathSoFar)})
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}
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return breadcrumbs
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}
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func joinRelativePath(parent, child string) string {
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if parent == "" {
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return child
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}
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return path.Join(parent, child)
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}
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func formatSize(size int64) string {
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return strconv.FormatInt(size, 10) + " B"
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}
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func methodNotAllowed(writer http.ResponseWriter, allowedMethod string) {
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writer.Header().Set("Allow", allowedMethod)
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http.Error(writer, "Method not allowed.", http.StatusMethodNotAllowed)
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}
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func renderLogin(writer http.ResponseWriter, status int, message string) {
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writer.Header().Set("Content-Type", "text/html; charset=utf-8")
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writer.WriteHeader(status)
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_ = loginTemplate.Execute(writer, struct{ Error string }{Error: message})
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}
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func renderChangePassword(writer http.ResponseWriter, status int, message string) {
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writer.Header().Set("Content-Type", "text/html; charset=utf-8")
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writer.WriteHeader(status)
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_ = changePasswordTemplate.Execute(writer, struct{ Error string }{Error: message})
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}
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func renderTemplate(writer http.ResponseWriter, pageTemplate *template.Template, data any) {
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writer.Header().Set("Content-Type", "text/html; charset=utf-8")
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if err := pageTemplate.Execute(writer, data); err != nil {
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http.Error(writer, "Unable to render page.", http.StatusInternalServerError)
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}
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}
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