Add API call for frontend to fetch list of valid roles from backend

- only relevant for admin config (addUser, editRole)
- admin only (double-checked)

internal/api/rest.go

@@ -76,6 +76,7 @@ func (api *RestApi) MountRoutes(r *mux.Router) {
 
 	if api.Authentication != nil {
 		r.HandleFunc("/jwt/", api.getJWT).Methods(http.MethodGet)
+		r.HandleFunc("/roles/", api.getRoles).Methods(http.MethodGet)
 		r.HandleFunc("/users/", api.createUser).Methods(http.MethodPost, http.MethodPut)
 		r.HandleFunc("/users/", api.getUsers).Methods(http.MethodGet)
 		r.HandleFunc("/users/", api.deleteUser).Methods(http.MethodDelete)
@@ -880,6 +881,22 @@ func (api *RestApi) getUsers(rw http.ResponseWriter, r *http.Request) {
 	json.NewEncoder(rw).Encode(users)
 }
 
+func (api *RestApi) getRoles(rw http.ResponseWriter, r *http.Request) {
+	user := auth.GetUser(r.Context())
+	if (!user.HasRole(auth.RoleAdmin)) {
+		http.Error(rw, "only admins are allowed to fetch a list of roles", http.StatusForbidden)
+		return
+	}
+
+	roles, err := auth.GetValidRoles(user)
+	if err != nil {
+		http.Error(rw, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	json.NewEncoder(rw).Encode(roles)
+}
+
 func (api *RestApi) updateUser(rw http.ResponseWriter, r *http.Request) {
 	if user := auth.GetUser(r.Context()); !user.HasRole(auth.RoleAdmin) {
 		http.Error(rw, "only admins are allowed to update a user", http.StatusForbidden)

internal/auth/auth.go

@@ -12,6 +12,7 @@ import (
 	"net/http"
 	"os"
 	"time"
+	"fmt"
 
 	"github.com/ClusterCockpit/cc-backend/pkg/log"
 	"github.com/gorilla/sessions"
@@ -139,6 +140,15 @@ func IsValidRole(role string) bool {
 	return false
 }
 
+func GetValidRoles(user *User) ([5]string, error) {
+	var vals [5]string
+	if (!user.HasRole(RoleAdmin)) {
+		return vals, fmt.Errorf("%#v: only admins are allowed to fetch a list of roles", user.Username)
+	} else {
+		return validRoles, nil
+	}
+}
+
 func GetUser(ctx context.Context) *User {
 	x := ctx.Value(ContextUserKey)
 	if x == nil {

web/frontend/src/config/AdminSettings.svelte

@@ -8,6 +8,7 @@
     import Options from './admin/Options.svelte'
 
     let users = []
+    let roles = []
 
     function getUserList() {
         fetch('/api/users/?via-ldap=false&not-just-user=true')
@@ -17,19 +18,32 @@
         })
     }
 
-    onMount(() => getUserList())
+    function getValidRoles() {
+        fetch('/api/roles/')
+            .then(res => res.json())
+            .then(rolesRaw => {
+                roles = rolesRaw
+        })
+    }
+
+    function initAdmin() {
+      getUserList()
+      getValidRoles()
+    }
+
+    onMount(() => initAdmin())
 
 </script>
 
 <Row cols={2} class="p-2 g-2" >
     <Col class="mb-1">
-        <AddUser on:reload={getUserList}/>
+        <AddUser roles={roles} on:reload={getUserList}/>
     </Col>
     <Col class="mb-1">
         <ShowUsers on:reload={getUserList} bind:users={users}/>
     </Col>
     <Col>
-        <EditRole on:reload={getUserList}/>
+        <EditRole roles={roles} on:reload={getUserList}/>
     </Col>
     <Col>
         <EditProject on:reload={getUserList}/>

web/frontend/src/config/admin/AddUser.svelte

@@ -7,6 +7,15 @@
 
     let message = {msg: '', color: '#d63384'}
     let displayMessage = false
+    let roleLabel = {
+      api: 'API',
+      user: 'User (regular user, same as if created via LDAP sync.)',
+      manager: 'Manager',
+      support: 'Support',
+      admin: 'Admin'
+    }
+
+    export let roles = []
 
     async function handleUserSubmit() {
         let form = document.querySelector('#create-user-form')
@@ -73,26 +82,19 @@
 
         <div class="mb-3">
             <p>Role:</p>
+            {#each roles as role, i}
+                {#if i == 0}
                     <div>
-                <input type="radio" id="user" name="role" value="user" checked/>
-                <label for="user">User (regular user, same as if created via LDAP sync.)</label>
+                        <input type="radio" id={role} name="role" value={role} checked/>
+                        <label for={role}>{roleLabel[role]}</label>
                     </div>
+                {:else}
                     <div>
-                <input type="radio" id="api" name="role" value="api"/>
-                <label for="api">API</label>
-            </div>
-            <div>
-                <input type="radio" id="manager" name="role" value="manager"/>
-                <label for="manager">Manager</label>
-            </div>
-            <div>
-                <input type="radio" id="support" name="role" value="support"/>
-                <label for="support">Support</label>
-            </div>
-            <div>
-                <input type="radio" id="admin" name="role" value="admin"/>
-                <label for="admin">Admin</label>
+                        <input type="radio" id={role} name="role" value={role}/>
+                        <label for={role}>{roleLabel[role]}</label>
                     </div>
+                {/if}
+            {/each}
         </div>
         <p style="display: flex; align-items: center;">
             <Button type="submit" color="primary">Submit</Button>

web/frontend/src/config/admin/EditRole.svelte

@@ -8,6 +8,15 @@
     let message = {msg: '', color: '#d63384'}
     let displayMessage = false
 
+    export let roles = []
+    let roleLabel = {
+      api: 'API',
+      user: 'User',
+      manager: 'Manager',
+      support: 'Support',
+      admin: 'Admin'
+    }
+
     async function handleAddRole() {
         const username = document.querySelector('#role-username').value
         const role = document.querySelector('#role-select').value
@@ -86,11 +95,9 @@
             <input type="text" class="form-control" placeholder="username" id="role-username"/>
             <select class="form-select" id="role-select">
                 <option selected value="">Role...</option>
-                <option value="user">User</option>
-                <option value="manager">Manager</option>
-                <option value="support">Support</option>
-                <option value="admin">Admin</option>
-                <option value="api">API</option>
+                {#each roles as role}
+                    <option value={role}>{roleLabel[role]}</option>
+                {/each}
             </select>
             <!-- PreventDefault on Sveltestrap-Button more complex to achieve than just use good ol' html button -->
             <!-- see: https://stackoverflow.com/questions/69630422/svelte-how-to-use-event-modifiers-in-my-own-components -->