feat(backend): serve /admin/* pages from api-server

12 files changed, 1165 insertions, 0 deletions

diff --git a/backend/admin/assets/css/LICENSE.normalize.css.md b/backend/admin/assets/css/LICENSE.normalize.css.md
new file mode 100644
index 0000000..43b5ddc
--- /dev/null
+++ b/backend/admin/assets/css/LICENSE.normalize.css.md
@@ -0,0 +1,21 @@
+# The MIT License (MIT)
+
+Copyright © Nicolas Gallagher and Jonathan Neal
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/backend/admin/assets/css/LICENSE.sakura.css.txt b/backend/admin/assets/css/LICENSE.sakura.css.txt
new file mode 100644
index 0000000..5c6f3e4
--- /dev/null
+++ b/backend/admin/assets/css/LICENSE.sakura.css.txt
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2016 Mitesh Shah
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/backend/admin/assets/css/normalize.css b/backend/admin/assets/css/normalize.css
new file mode 100644
index 0000000..9b77e0e
--- /dev/null
+++ b/backend/admin/assets/css/normalize.css
@@ -0,0 +1,461 @@
+/*! normalize.css v5.0.0 | MIT License | github.com/necolas/normalize.css */
+
+/**
+ * 1. Change the default font family in all browsers (opinionated).
+ * 2. Correct the line height in all browsers.
+ * 3. Prevent adjustments of font size after orientation changes in
+ *    IE on Windows Phone and in iOS.
+ */
+
+/* Document
+   ========================================================================== */
+
+html {
+  font-family: sans-serif; /* 1 */
+  line-height: 1.15; /* 2 */
+  -ms-text-size-adjust: 100%; /* 3 */
+  -webkit-text-size-adjust: 100%; /* 3 */
+}
+
+/* Sections
+   ========================================================================== */
+
+/**
+ * Remove the margin in all browsers (opinionated).
+ */
+
+body {
+  margin: 0;
+}
+
+/**
+ * Add the correct display in IE 9-.
+ */
+
+article,
+aside,
+footer,
+header,
+nav,
+section {
+  display: block;
+}
+
+/**
+ * Correct the font size and margin on `h1` elements within `section` and
+ * `article` contexts in Chrome, Firefox, and Safari.
+ */
+
+h1 {
+  font-size: 2em;
+  margin: 0.67em 0;
+}
+
+/* Grouping content
+   ========================================================================== */
+
+/**
+ * Add the correct display in IE 9-.
+ * 1. Add the correct display in IE.
+ */
+
+figcaption,
+figure,
+main { /* 1 */
+  display: block;
+}
+
+/**
+ * Add the correct margin in IE 8.
+ */
+
+figure {
+  margin: 1em 40px;
+}
+
+/**
+ * 1. Add the correct box sizing in Firefox.
+ * 2. Show the overflow in Edge and IE.
+ */
+
+hr {
+  box-sizing: content-box; /* 1 */
+  height: 0; /* 1 */
+  overflow: visible; /* 2 */
+}
+
+/**
+ * 1. Correct the inheritance and scaling of font size in all browsers.
+ * 2. Correct the odd `em` font sizing in all browsers.
+ */
+
+pre {
+  font-family: monospace, monospace; /* 1 */
+  font-size: 1em; /* 2 */
+}
+
+/* Text-level semantics
+   ========================================================================== */
+
+/**
+ * 1. Remove the gray background on active links in IE 10.
+ * 2. Remove gaps in links underline in iOS 8+ and Safari 8+.
+ */
+
+a {
+  background-color: transparent; /* 1 */
+  -webkit-text-decoration-skip: objects; /* 2 */
+}
+
+/**
+ * Remove the outline on focused links when they are also active or hovered
+ * in all browsers (opinionated).
+ */
+
+a:active,
+a:hover {
+  outline-width: 0;
+}
+
+/**
+ * 1. Remove the bottom border in Firefox 39-.
+ * 2. Add the correct text decoration in Chrome, Edge, IE, Opera, and Safari.
+ */
+
+abbr[title] {
+  border-bottom: none; /* 1 */
+  text-decoration: underline; /* 2 */
+  text-decoration: underline dotted; /* 2 */
+}
+
+/**
+ * Prevent the duplicate application of `bolder` by the next rule in Safari 6.
+ */
+
+b,
+strong {
+  font-weight: inherit;
+}
+
+/**
+ * Add the correct font weight in Chrome, Edge, and Safari.
+ */
+
+b,
+strong {
+  font-weight: bolder;
+}
+
+/**
+ * 1. Correct the inheritance and scaling of font size in all browsers.
+ * 2. Correct the odd `em` font sizing in all browsers.
+ */
+
+code,
+kbd,
+samp {
+  font-family: monospace, monospace; /* 1 */
+  font-size: 1em; /* 2 */
+}
+
+/**
+ * Add the correct font style in Android 4.3-.
+ */
+
+dfn {
+  font-style: italic;
+}
+
+/**
+ * Add the correct background and color in IE 9-.
+ */
+
+mark {
+  background-color: #ff0;
+  color: #000;
+}
+
+/**
+ * Add the correct font size in all browsers.
+ */
+
+small {
+  font-size: 80%;
+}
+
+/**
+ * Prevent `sub` and `sup` elements from affecting the line height in
+ * all browsers.
+ */
+
+sub,
+sup {
+  font-size: 75%;
+  line-height: 0;
+  position: relative;
+  vertical-align: baseline;
+}
+
+sub {
+  bottom: -0.25em;
+}
+
+sup {
+  top: -0.5em;
+}
+
+/* Embedded content
+   ========================================================================== */
+
+/**
+ * Add the correct display in IE 9-.
+ */
+
+audio,
+video {
+  display: inline-block;
+}
+
+/**
+ * Add the correct display in iOS 4-7.
+ */
+
+audio:not([controls]) {
+  display: none;
+  height: 0;
+}
+
+/**
+ * Remove the border on images inside links in IE 10-.
+ */
+
+img {
+  border-style: none;
+}
+
+/**
+ * Hide the overflow in IE.
+ */
+
+svg:not(:root) {
+  overflow: hidden;
+}
+
+/* Forms
+   ========================================================================== */
+
+/**
+ * 1. Change the font styles in all browsers (opinionated).
+ * 2. Remove the margin in Firefox and Safari.
+ */
+
+button,
+input,
+optgroup,
+select,
+textarea {
+  font-family: sans-serif; /* 1 */
+  font-size: 100%; /* 1 */
+  line-height: 1.15; /* 1 */
+  margin: 0; /* 2 */
+}
+
+/**
+ * Show the overflow in IE.
+ * 1. Show the overflow in Edge.
+ */
+
+button,
+input { /* 1 */
+  overflow: visible;
+}
+
+/**
+ * Remove the inheritance of text transform in Edge, Firefox, and IE.
+ * 1. Remove the inheritance of text transform in Firefox.
+ */
+
+button,
+select { /* 1 */
+  text-transform: none;
+}
+
+/**
+ * 1. Prevent a WebKit bug where (2) destroys native `audio` and `video`
+ *    controls in Android 4.
+ * 2. Correct the inability to style clickable types in iOS and Safari.
+ */
+
+button,
+html [type="button"], /* 1 */
+[type="reset"],
+[type="submit"] {
+  -webkit-appearance: button; /* 2 */
+}
+
+/**
+ * Remove the inner border and padding in Firefox.
+ */
+
+button::-moz-focus-inner,
+[type="button"]::-moz-focus-inner,
+[type="reset"]::-moz-focus-inner,
+[type="submit"]::-moz-focus-inner {
+  border-style: none;
+  padding: 0;
+}
+
+/**
+ * Restore the focus styles unset by the previous rule.
+ */
+
+button:-moz-focusring,
+[type="button"]:-moz-focusring,
+[type="reset"]:-moz-focusring,
+[type="submit"]:-moz-focusring {
+  outline: 1px dotted ButtonText;
+}
+
+/**
+ * Change the border, margin, and padding in all browsers (opinionated).
+ */
+
+fieldset {
+  border: 1px solid #c0c0c0;
+  margin: 0 2px;
+  padding: 0.35em 0.625em 0.75em;
+}
+
+/**
+ * 1. Correct the text wrapping in Edge and IE.
+ * 2. Correct the color inheritance from `fieldset` elements in IE.
+ * 3. Remove the padding so developers are not caught out when they zero out
+ *    `fieldset` elements in all browsers.
+ */
+
+legend {
+  box-sizing: border-box; /* 1 */
+  color: inherit; /* 2 */
+  display: table; /* 1 */
+  max-width: 100%; /* 1 */
+  padding: 0; /* 3 */
+  white-space: normal; /* 1 */
+}
+
+/**
+ * 1. Add the correct display in IE 9-.
+ * 2. Add the correct vertical alignment in Chrome, Firefox, and Opera.
+ */
+
+progress {
+  display: inline-block; /* 1 */
+  vertical-align: baseline; /* 2 */
+}
+
+/**
+ * Remove the default vertical scrollbar in IE.
+ */
+
+textarea {
+  overflow: auto;
+}
+
+/**
+ * 1. Add the correct box sizing in IE 10-.
+ * 2. Remove the padding in IE 10-.
+ */
+
+[type="checkbox"],
+[type="radio"] {
+  box-sizing: border-box; /* 1 */
+  padding: 0; /* 2 */
+}
+
+/**
+ * Correct the cursor style of increment and decrement buttons in Chrome.
+ */
+
+[type="number"]::-webkit-inner-spin-button,
+[type="number"]::-webkit-outer-spin-button {
+  height: auto;
+}
+
+/**
+ * 1. Correct the odd appearance in Chrome and Safari.
+ * 2. Correct the outline style in Safari.
+ */
+
+[type="search"] {
+  -webkit-appearance: textfield; /* 1 */
+  outline-offset: -2px; /* 2 */
+}
+
+/**
+ * Remove the inner padding and cancel buttons in Chrome and Safari on macOS.
+ */
+
+[type="search"]::-webkit-search-cancel-button,
+[type="search"]::-webkit-search-decoration {
+  -webkit-appearance: none;
+}
+
+/**
+ * 1. Correct the inability to style clickable types in iOS and Safari.
+ * 2. Change font properties to `inherit` in Safari.
+ */
+
+::-webkit-file-upload-button {
+  -webkit-appearance: button; /* 1 */
+  font: inherit; /* 2 */
+}
+
+/* Interactive
+   ========================================================================== */
+
+/*
+ * Add the correct display in IE 9-.
+ * 1. Add the correct display in Edge, IE, and Firefox.
+ */
+
+details, /* 1 */
+menu {
+  display: block;
+}
+
+/*
+ * Add the correct display in all browsers.
+ */
+
+summary {
+  display: list-item;
+}
+
+/* Scripting
+   ========================================================================== */
+
+/**
+ * Add the correct display in IE 9-.
+ */
+
+canvas {
+  display: inline-block;
+}
+
+/**
+ * Add the correct display in IE.
+ */
+
+template {
+  display: none;
+}
+
+/* Hidden
+   ========================================================================== */
+
+/**
+ * Add the correct display in IE 10-.
+ */
+
+[hidden] {
+  display: none;
+}
diff --git a/backend/admin/assets/css/sakura.css b/backend/admin/assets/css/sakura.css
new file mode 100644
index 0000000..3992573
--- /dev/null
+++ b/backend/admin/assets/css/sakura.css
@@ -0,0 +1,226 @@
+/* Sakura.css v1.5.0
+ * ================
+ * Minimal css theme.
+ * Project: https://github.com/oxalorg/sakura/
+ */
+/* Body */
+html {
+  font-size: 62.5%;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
+}
+
+body {
+  font-size: 1.8rem;
+  line-height: 1.618;
+  max-width: 38em;
+  margin: auto;
+  color: #4a4a4a;
+  background-color: #f9f9f9;
+  padding: 13px;
+}
+
+@media (max-width: 684px) {
+  body {
+    font-size: 1.53rem;
+  }
+}
+@media (max-width: 382px) {
+  body {
+    font-size: 1.35rem;
+  }
+}
+h1, h2, h3, h4, h5, h6 {
+  line-height: 1.1;
+  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
+  font-weight: 700;
+  margin-top: 3rem;
+  margin-bottom: 1.5rem;
+  overflow-wrap: break-word;
+  word-wrap: break-word;
+  -ms-word-break: break-all;
+  word-break: break-word;
+}
+
+h1 {
+  font-size: 2.35em;
+}
+
+h2 {
+  font-size: 2em;
+}
+
+h3 {
+  font-size: 1.75em;
+}
+
+h4 {
+  font-size: 1.5em;
+}
+
+h5 {
+  font-size: 1.25em;
+}
+
+h6 {
+  font-size: 1em;
+}
+
+p {
+  margin-top: 0px;
+  margin-bottom: 2.5rem;
+}
+
+small, sub, sup {
+  font-size: 75%;
+}
+
+hr {
+  border-color: #1d7484;
+}
+
+a {
+  text-decoration: none;
+  color: #1d7484;
+}
+a:visited {
+  color: #144f5a;
+}
+a:hover {
+  color: #982c61;
+  border-bottom: 2px solid #4a4a4a;
+}
+
+ul {
+  padding-left: 1.4em;
+  margin-top: 0px;
+  margin-bottom: 2.5rem;
+}
+
+li {
+  margin-bottom: 0.4em;
+}
+
+blockquote {
+  margin-left: 0px;
+  margin-right: 0px;
+  padding-left: 1em;
+  padding-top: 0.8em;
+  padding-bottom: 0.8em;
+  padding-right: 0.8em;
+  border-left: 5px solid #1d7484;
+  margin-bottom: 2.5rem;
+  background-color: #f1f1f1;
+}
+
+blockquote p {
+  margin-bottom: 0;
+}
+
+img, video {
+  height: auto;
+  max-width: 100%;
+  margin-top: 0px;
+  margin-bottom: 2.5rem;
+}
+
+/* Pre and Code */
+pre {
+  background-color: #f1f1f1;
+  display: block;
+  padding: 1em;
+  overflow-x: auto;
+  margin-top: 0px;
+  margin-bottom: 2.5rem;
+  font-size: 0.9em;
+}
+
+code, kbd, samp {
+  font-size: 0.9em;
+  padding: 0 0.5em;
+  background-color: #f1f1f1;
+  white-space: pre-wrap;
+}
+
+pre > code {
+  padding: 0;
+  background-color: transparent;
+  white-space: pre;
+  font-size: 1em;
+}
+
+/* Tables */
+table {
+  text-align: justify;
+  width: 100%;
+  border-collapse: collapse;
+  margin-bottom: 2rem;
+}
+
+td, th {
+  padding: 0.5em;
+  border-bottom: 1px solid #f1f1f1;
+}
+
+/* Buttons, forms and input */
+input, textarea {
+  border: 1px solid #4a4a4a;
+}
+input:focus, textarea:focus {
+  border: 1px solid #1d7484;
+}
+
+textarea {
+  width: 100%;
+}
+
+.button, button, input[type=submit], input[type=reset], input[type=button], input[type=file]::file-selector-button {
+  display: inline-block;
+  padding: 5px 10px;
+  text-align: center;
+  text-decoration: none;
+  white-space: nowrap;
+  background-color: #1d7484;
+  color: #f9f9f9;
+  border-radius: 1px;
+  border: 1px solid #1d7484;
+  cursor: pointer;
+  box-sizing: border-box;
+}
+.button[disabled], button[disabled], input[type=submit][disabled], input[type=reset][disabled], input[type=button][disabled], input[type=file]::file-selector-button[disabled] {
+  cursor: default;
+  opacity: 0.5;
+}
+.button:hover, button:hover, input[type=submit]:hover, input[type=reset]:hover, input[type=button]:hover, input[type=file]::file-selector-button:hover {
+  background-color: #982c61;
+  color: #f9f9f9;
+  outline: 0;
+}
+.button:focus-visible, button:focus-visible, input[type=submit]:focus-visible, input[type=reset]:focus-visible, input[type=button]:focus-visible, input[type=file]::file-selector-button:focus-visible {
+  outline-style: solid;
+  outline-width: 2px;
+}
+
+textarea, select, input {
+  color: #4a4a4a;
+  padding: 6px 10px; /* The 6px vertically centers text on FF, ignored by Webkit */
+  margin-bottom: 10px;
+  background-color: #f1f1f1;
+  border: 1px solid #f1f1f1;
+  border-radius: 4px;
+  box-shadow: none;
+  box-sizing: border-box;
+}
+textarea:focus, select:focus, input:focus {
+  border: 1px solid #1d7484;
+  outline: 0;
+}
+
+input[type=checkbox]:focus {
+  outline: 1px dotted #1d7484;
+}
+
+label, legend, fieldset {
+  display: block;
+  margin-bottom: 0.5rem;
+  font-weight: 600;
+}
diff --git a/backend/admin/handlers.go b/backend/admin/handlers.go
new file mode 100644
index 0000000..1c7995d
--- /dev/null
+++ b/backend/admin/handlers.go
@@ -0,0 +1,240 @@
+package admin
+
+import (
+	"errors"
+	"net/http"
+	"strconv"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+	"github.com/jackc/pgx/v5/pgtype"
+	"github.com/labstack/echo/v4"
+
+	"github.com/nsfisis/iosdc-japan-2024-albatross/backend/db"
+)
+
+var jst = time.FixedZone("Asia/Tokyo", 9*60*60)
+
+type AdminHandler struct {
+	q    *db.Queries
+	hubs GameHubsInterface
+}
+
+type GameHubsInterface interface {
+	StartGame(gameID int) error
+}
+
+func NewAdminHandler(q *db.Queries, hubs GameHubsInterface) *AdminHandler {
+	return &AdminHandler{
+		q:    q,
+		hubs: hubs,
+	}
+}
+
+func (h *AdminHandler) RegisterHandlers(g *echo.Group) {
+	g.Use(newAssetsMiddleware())
+
+	g.GET("/dashboard", h.getDashboard)
+	g.GET("/users", h.getUsers)
+	g.GET("/users/:userID", h.getUserEdit)
+	g.GET("/games", h.getGames)
+	g.GET("/games/:gameID", h.getGameEdit)
+	g.POST("/games/:gameID", h.postGameEdit)
+}
+
+func (h *AdminHandler) getDashboard(c echo.Context) error {
+	return c.Render(http.StatusOK, "dashboard", echo.Map{
+		"Title": "Dashboard",
+	})
+}
+
+func (h *AdminHandler) getUsers(c echo.Context) error {
+	rows, err := h.q.ListUsers(c.Request().Context())
+	if err != nil {
+		return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
+	}
+	users := make([]echo.Map, len(rows))
+	for i, u := range rows {
+		users[i] = echo.Map{
+			"UserID":      u.UserID,
+			"Username":    u.Username,
+			"DisplayName": u.DisplayName,
+			"IconPath":    u.IconPath,
+			"IsAdmin":     u.IsAdmin,
+		}
+	}
+
+	return c.Render(http.StatusOK, "users", echo.Map{
+		"Title": "Users",
+		"Users": users,
+	})
+}
+
+func (h *AdminHandler) getUserEdit(c echo.Context) error {
+	userID, err := strconv.Atoi(c.Param("userID"))
+	if err != nil {
+		return echo.NewHTTPError(http.StatusBadRequest, "Invalid user id")
+	}
+	row, err := h.q.GetUserByID(c.Request().Context(), int32(userID))
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			return echo.NewHTTPError(http.StatusNotFound)
+		} else {
+			return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
+		}
+	}
+
+	return c.Render(http.StatusOK, "user_edit", echo.Map{
+		"Title": "User Edit",
+		"User": echo.Map{
+			"UserID":      row.UserID,
+			"Username":    row.Username,
+			"DisplayName": row.DisplayName,
+			"IconPath":    row.IconPath,
+			"IsAdmin":     row.IsAdmin,
+		},
+	})
+}
+
+func (h *AdminHandler) getGames(c echo.Context) error {
+	rows, err := h.q.ListGames(c.Request().Context())
+	if err != nil {
+		return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
+	}
+	games := make([]echo.Map, len(rows))
+	for i, g := range rows {
+		var startedAt string
+		if !g.StartedAt.Valid {
+			startedAt = g.StartedAt.Time.In(jst).Format("2006-01-02T15:04:05")
+		}
+		games[i] = echo.Map{
+			"GameID":          g.GameID,
+			"State":           g.State,
+			"DisplayName":     g.DisplayName,
+			"DurationSeconds": g.DurationSeconds,
+			"StartedAt":       startedAt,
+			"ProblemID":       g.ProblemID,
+		}
+	}
+
+	return c.Render(http.StatusOK, "games", echo.Map{
+		"Title": "Games",
+		"Games": games,
+	})
+}
+
+func (h *AdminHandler) getGameEdit(c echo.Context) error {
+	gameID, err := strconv.Atoi(c.Param("gameID"))
+	if err != nil {
+		return echo.NewHTTPError(http.StatusBadRequest, "Invalid game id")
+	}
+	row, err := h.q.GetGameByID(c.Request().Context(), int32(gameID))
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			return echo.NewHTTPError(http.StatusNotFound)
+		} else {
+			return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
+		}
+	}
+
+	var startedAt string
+	if !row.StartedAt.Valid {
+		startedAt = row.StartedAt.Time.In(jst).Format("2006-01-02T15:04:05")
+	}
+
+	return c.Render(http.StatusOK, "game_edit", echo.Map{
+		"Title": "Game Edit",
+		"Game": echo.Map{
+			"GameID":          row.GameID,
+			"State":           row.State,
+			"DisplayName":     row.DisplayName,
+			"DurationSeconds": row.DurationSeconds,
+			"StartedAt":       startedAt,
+			"ProblemID":       row.ProblemID,
+		},
+	})
+}
+
+func (h *AdminHandler) postGameEdit(c echo.Context) error {
+	gameID, err := strconv.Atoi(c.Param("gameID"))
+	if err != nil {
+		return echo.NewHTTPError(http.StatusBadRequest, "Invalid game id")
+	}
+	row, err := h.q.GetGameByID(c.Request().Context(), int32(gameID))
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			return echo.NewHTTPError(http.StatusNotFound)
+		} else {
+			return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
+		}
+	}
+
+	state := c.FormValue("state")
+	displayName := c.FormValue("display_name")
+	durationSeconds, err := strconv.Atoi(c.FormValue("duration_seconds"))
+	if err != nil {
+		return echo.NewHTTPError(http.StatusBadRequest, "Invalid duration_seconds")
+	}
+	var problemID *int
+	{
+		problemIDRaw := c.FormValue("problem_id")
+		if problemIDRaw != "" {
+			problemIDInt, err := strconv.Atoi(problemIDRaw)
+			if err != nil {
+				return echo.NewHTTPError(http.StatusBadRequest, "Invalid problem_id")
+			}
+			problemID = &problemIDInt
+		}
+	}
+	var startedAt *time.Time
+	{
+		startedAtRaw := c.FormValue("started_at")
+		if startedAtRaw != "" {
+			startedAtTime, err := time.Parse("2006-01-02T15:04:05", startedAtRaw)
+			if err != nil {
+				return echo.NewHTTPError(http.StatusBadRequest, "Invalid started_at")
+			}
+			startedAt = &startedAtTime
+		}
+	}
+
+	var changedStartedAt pgtype.Timestamp
+	if startedAt == nil {
+		changedStartedAt = pgtype.Timestamp{
+			Valid: false,
+		}
+	} else {
+		changedStartedAt = pgtype.Timestamp{
+			Time:  *startedAt,
+			Valid: true,
+		}
+	}
+	var changedProblemID *int32
+	if problemID == nil {
+		changedProblemID = nil
+	} else {
+		changedProblemID = new(int32)
+		*changedProblemID = int32(*problemID)
+	}
+
+	{
+		// TODO:
+		if state != row.State && state == "prepare" {
+			h.hubs.StartGame(int(gameID))
+		}
+	}
+
+	err = h.q.UpdateGame(c.Request().Context(), db.UpdateGameParams{
+		GameID:          int32(gameID),
+		State:           state,
+		DisplayName:     displayName,
+		DurationSeconds: int32(durationSeconds),
+		StartedAt:       changedStartedAt,
+		ProblemID:       changedProblemID,
+	})
+	if err != nil {
+		return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
+	}
+
+	return c.String(http.StatusNoContent, "")
+}
diff --git a/backend/admin/renderer.go b/backend/admin/renderer.go
new file mode 100644
index 0000000..468677f
--- /dev/null
+++ b/backend/admin/renderer.go
@@ -0,0 +1,49 @@
+package admin
+
+import (
+	"embed"
+	"html/template"
+	"io"
+	"net/http"
+
+	"github.com/labstack/echo/v4"
+	"github.com/labstack/echo/v4/middleware"
+)
+
+var (
+	//go:embed templates
+	templatesFS embed.FS
+	//go:embed assets
+	assetsFS embed.FS
+)
+
+type Renderer struct {
+	templates map[string]*template.Template
+}
+
+func NewRenderer() *Renderer {
+	return &Renderer{
+		templates: make(map[string]*template.Template),
+	}
+}
+
+func (r *Renderer) Render(w io.Writer, name string, data interface{}, c echo.Context) error {
+	tmpl, ok := r.templates[name]
+	if !ok {
+		t, err := template.ParseFS(templatesFS, "templates/base.html", "templates/"+name+".html")
+		if err != nil {
+			return echo.NewHTTPError(http.StatusInternalServerError, err.Error())
+		}
+		r.templates[name] = t
+		tmpl = t
+	}
+	return tmpl.ExecuteTemplate(w, name+".html", data)
+}
+
+func newAssetsMiddleware() echo.MiddlewareFunc {
+	return middleware.StaticWithConfig(middleware.StaticConfig{
+		Root:       "/assets",
+		Filesystem: http.FS(assetsFS),
+		IgnoreBase: true,
+	})
+}
diff --git a/backend/admin/templates/base.html b/backend/admin/templates/base.html
new file mode 100644
index 0000000..4bcdbdd
--- /dev/null
+++ b/backend/admin/templates/base.html
@@ -0,0 +1,25 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title>ADMIN {{ .Title }} | iOSDC Japan 2024 Albatross.swift</title>
+  <link rel="icon" href="/favicon.svg">
+  <link rel="stylesheet" href="/admin/css/normalize.css">
+  <link rel="stylesheet" href="/admin/css/sakura.css">
+</head>
+<body>
+  <section>
+    <h1>ADMIN {{ .Title }}</h1>
+    <p>
+      <em>This is an admin page.</em>
+    </p>
+    <section>
+      <nav>
+        {{ block "breadcrumb" . }}{{ end }}
+      </nav>
+    </section>
+    <section>
+      {{ block "content" . }}{{ end }}
+    </section>
+  </section>
+</body>
+</html>
diff --git a/backend/admin/templates/dashboard.html b/backend/admin/templates/dashboard.html
new file mode 100644
index 0000000..2d7e8ad
--- /dev/null
+++ b/backend/admin/templates/dashboard.html
@@ -0,0 +1,10 @@
+{{ template "base.html" . }}
+
+{{ define "content" }}
+<p>
+  <a href="/admin/users">Users</a>
+</p>
+<p>
+  <a href="/admin/games">Games</a>
+</p>
+{{ end }}
diff --git a/backend/admin/templates/game_edit.html b/backend/admin/templates/game_edit.html
new file mode 100644
index 0000000..8bc5410
--- /dev/null
+++ b/backend/admin/templates/game_edit.html
@@ -0,0 +1,45 @@
+{{ template "base.html" . }}
+
+{{ define "breadcrumb" }}
+<a href="/admin/dashboard">Dashboard</a> | <a href="/admin/games">Games</a>
+{{ end }}
+
+{{ define "content" }}
+<form>
+  <div>
+    <label>Game ID</label>
+    <input type="text" name="game_id" value="{{ .Game.GameID }}" readonly required>
+  </div>
+  <div>
+    <label>Display Name</label>
+    <input type="text" name="display_name" value="{{ .Game.DisplayName }}" required>
+  </div>
+  <div>
+    <label>State</label>
+    <select>
+      <option value="closed"{{ if eq .Game.State "closed" }} selected{{ end }}>Closed</option>
+      <option value="waiting_entries"{{ if eq .Game.State "waiting_entries" }} selected{{ end }}>WaitingEntries</option>
+      <option value="waiting_start"{{ if eq .Game.State "waiting_start" }} selected{{ end }}>WaitingStart</option>
+      <option value="prepare"{{ if eq .Game.State "prepare" }} selected{{ end }}>Prepare</option>
+      <option value="starting"{{ if eq .Game.State "starting" }} selected{{ end }}>Starting</option>
+      <option value="gaming"{{ if eq .Game.State "gaming" }} selected{{ end }}>Gaming</option>
+      <option value="finished"{{ if eq .Game.State "finished" }} selected{{ end }}>Finished</option>
+    </select>
+  </div>
+  <div>
+    <label>Duration Seconds</label>
+    <input type="number" name="duration_seconds" value="{{ .Game.DurationSeconds }}" required>
+  </div>
+  <div>
+    <label>Started At</label>
+    <input type="datetime-local" name="started_at" value="{{ .Game.StartedAt }}">
+  </div>
+  <div>
+    <label>Problem ID</label>
+    <input type="text" name="problem_id" value="{{ .Game.ProblemID }}" disabled>
+  </div>
+  <div>
+    <button type="submit">Save</button>
+  </div>
+</form>
+{{ end }}
diff --git a/backend/admin/templates/games.html b/backend/admin/templates/games.html
new file mode 100644
index 0000000..244fc94
--- /dev/null
+++ b/backend/admin/templates/games.html
@@ -0,0 +1,17 @@
+{{ template "base.html" . }}
+
+{{ define "breadcrumb" }}
+<a href="/admin/dashboard">Dashboard</a>
+{{ end }}
+
+{{ define "content" }}
+<ul>
+  {{ range .Games }}
+    <li>
+      <a href="/admin/games/{{ .GameID }}">
+        {{ .DisplayName }} (id={{ .GameID }})
+      </a>
+    </li>
+  {{ end }}
+</ul>
+{{ end }}
diff --git a/backend/admin/templates/user_edit.html b/backend/admin/templates/user_edit.html
new file mode 100644
index 0000000..9089b1e
--- /dev/null
+++ b/backend/admin/templates/user_edit.html
@@ -0,0 +1,33 @@
+{{ template "base.html" . }}
+
+{{ define "breadcrumb" }}
+<a href="/admin/dashboard">Dashboard</a> | <a href="/admin/users">Users</a>
+{{ end }}
+
+{{ define "content" }}
+<form>
+  <div>
+    <label>User ID</label>
+    <input type="text" name="user_id" value="{{ .User.UserID }}" readonly required>
+  </div>
+  <div>
+    <label>Username</label>
+    <input type="text" name="username" value="{{ .User.Username }}" readonly required>
+  </div>
+  <div>
+    <label>Display Name</label>
+    <input type="text" name="display_name" value="{{ .User.DisplayName }}" required>
+  </div>
+  <div>
+    <label>Icon Path</label>
+    <input type="text" name="icon_path" value="{{ .User.IconPath }}">
+  </div>
+  <div>
+    <label>Is Admin</label>
+    <input type="checkbox" name="is_admin"{{ if .User.IsAdmin }} checked{{ end }}>
+  </div>
+  <div>
+    <button type="submit">Save</button>
+  </div>
+</form>
+{{ end }}
diff --git a/backend/admin/templates/users.html b/backend/admin/templates/users.html
new file mode 100644
index 0000000..656ad53
--- /dev/null
+++ b/backend/admin/templates/users.html
@@ -0,0 +1,17 @@
+{{ template "base.html" . }}
+
+{{ define "breadcrumb" }}
+<a href="/admin/dashboard">Dashboard</a>
+{{ end }}
+
+{{ define "content" }}
+<ul>
+  {{ range .Users }}
+    <li>
+      <a href="/admin/users/{{ .UserID }}">
+        {{ .DisplayName }} (id={{ .UserID }} username={{ .Username }}){{ if .IsAdmin }} <em>admin</em>{{ end }}
+      </a>
+    </li>
+  {{ end }}
+</ul>
+{{ end }}