feat(webui): add state creation page

pkg/webui/html/states.html

@@ -1,5 +1,11 @@
 {{ define "main" }}
 <main class="responsive" id="main">
+  <a href="/states/new">
+    <button class="small-round">
+      <i>add</i>
+      <span>New</span>
+    </button>
+  </a>
   <table class="clickable-rows no-space">
     <thead>
       <tr>

pkg/webui/html/states_new.html

@@ -0,0 +1,33 @@
+{{ define "main" }}
+<main class="responsive">
+  <form action="/states/new" enctype="multipart/form-data" method="post">
+    <fieldset>
+      <div class="field border label{{ if .PathError }} invalid{{ end }}">
+        <input autofocus
+               id="path"
+               name="path"
+               required
+               type="text"
+               value="{{ .Path }}">
+        <label for="path">Path</label>
+        {{ if .PathDuplicate }}
+        <span class="error">This path already exist</span>
+        {{ else if .PathError }}
+        <span class="error">Invalid path</span>
+        {{ else }}
+        <span class="helper">Valid URL path beginning with a /</span>
+        {{ end }}
+      </div>
+      <div class="field label border">
+        <input name="file"
+               required
+               type="file">
+        <input type="text">
+        <label>File</label>
+        <span class="helper">JSON state file</span>
+      </div>
+      <button class="small-round" type="submit" value="submit">New</button>
+    </fieldset>
+  </form>
+</main>
+{{ end }}

pkg/webui/routes.go

@@ -19,6 +19,8 @@ func addRoutes(
 	mux.Handle("GET /settings", requireLogin(handleSettingsGET(db)))
 	mux.Handle("POST /settings", requireLogin(handleSettingsPOST(db)))
 	mux.Handle("GET /states", requireLogin(handleStatesGET(db)))
+	mux.Handle("GET /states/new", requireLogin(handleStatesNewGET(db)))
+	mux.Handle("POST /states/new", requireLogin(handleStatesNewPOST(db)))
 	mux.Handle("GET /state/{id}", requireLogin(handleStateGET(db)))
 	mux.Handle("GET /static/", cache(http.FileServer(http.FS(staticFS))))
 	mux.Handle("GET /version/{id}", requireLogin(handleVersionGET(db)))

pkg/webui/states_new.go

@@ -0,0 +1,84 @@
+package webui
+
+import (
+	"fmt"
+	"html/template"
+	"io"
+	"net/http"
+	"net/url"
+	"path"
+	"strconv"
+
+	"git.adyxax.org/adyxax/tfstated/pkg/database"
+	"git.adyxax.org/adyxax/tfstated/pkg/model"
+)
+
+type StatesNewPage struct {
+	Page          *Page
+	fileError     bool
+	Path          string
+	PathDuplicate bool
+	PathError     bool
+}
+
+var statesNewTemplates = template.Must(template.ParseFS(htmlFS, "html/base.html", "html/states_new.html"))
+
+func handleStatesNewGET(db *database.DB) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		render(w, statesNewTemplates, http.StatusOK, StatesNewPage{
+			Page: makePage(r, &Page{Title: "New State", Section: "states"}),
+		})
+	})
+}
+
+func handleStatesNewPOST(db *database.DB) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		// file upload limit of 20MB
+		if err := r.ParseMultipartForm(20 << 20); err != nil {
+			errorResponse(w, http.StatusBadRequest, err)
+			return
+		}
+		file, _, err := r.FormFile("file")
+		if err != nil {
+			errorResponse(w, http.StatusBadRequest, err)
+			return
+		}
+		defer file.Close()
+		statePath := r.FormValue("path")
+		parsedStatePath, err := url.Parse(statePath)
+		if err != nil || path.Clean(parsedStatePath.Path) != statePath || statePath[0] != '/' {
+			render(w, statesNewTemplates, http.StatusBadRequest, StatesNewPage{
+				Page:      makePage(r, &Page{Title: "New State", Section: "states"}),
+				Path:      statePath,
+				PathError: true,
+			})
+			return
+		}
+		data, err := io.ReadAll(file)
+		if err != nil {
+			errorResponse(w, http.StatusBadRequest, fmt.Errorf("failed to read uploaded file: %w", err))
+			return
+		}
+		fileType := http.DetectContentType(data)
+		if fileType != "text/plain; charset=utf-8" {
+			errorResponse(w, http.StatusBadRequest, fmt.Errorf("invalid file type: expected \"text/plain; charset=utf-8\" but got \"%s\"", fileType))
+			return
+		}
+		account := r.Context().Value(model.AccountContextKey{}).(*model.Account)
+		version, err := db.CreateState(statePath, account.Id, data)
+		if err != nil {
+			errorResponse(w, http.StatusInternalServerError, err)
+			return
+		}
+		if version == nil {
+			render(w, statesNewTemplates, http.StatusBadRequest, StatesNewPage{
+				Page:          makePage(r, &Page{Title: "New State", Section: "states"}),
+				Path:          statePath,
+				PathDuplicate: true,
+			})
+			return
+		}
+		destination := path.Join("/version", strconv.Itoa(version.Id))
+		http.Redirect(w, r, destination, http.StatusFound)
+	})
+}