settings: Add user_can_create_web_public_streams function.

This commit adds user_can_create_web_public_streams function
in settings_data.js which will be used in further commits
to disable or hide the UI elements for creating web-public
streams.

frontend_tests/node_tests/settings_data.js

@@ -283,3 +283,49 @@ run_test("user_can_invite_others_to_realm_nobody_case", () => {
         settings_config.invite_to_realm_policy_values.nobody.code;
     assert.equal(settings_data.user_can_invite_others_to_realm(), false);
 });
+
+run_test("user_can_create_web_public_streams", () => {
+    page_params.is_owner = true;
+    page_params.server_web_public_streams_enabled = true;
+    page_params.realm_enable_spectator_access = true;
+    page_params.realm_create_web_public_stream_policy =
+        settings_config.create_web_public_stream_policy_values.nobody.code;
+    assert.equal(settings_data.user_can_create_web_public_streams(), false);
+
+    page_params.realm_create_web_public_stream_policy =
+        settings_config.create_web_public_stream_policy_values.by_owners_only.code;
+    assert.equal(settings_data.user_can_create_web_public_streams(), true);
+
+    page_params.realm_enable_spectator_access = false;
+    page_params.server_web_public_streams_enabled = true;
+    assert.equal(settings_data.user_can_create_web_public_streams(), false);
+
+    page_params.realm_enable_spectator_access = true;
+    page_params.server_web_public_streams_enabled = false;
+    assert.equal(settings_data.user_can_create_web_public_streams(), false);
+
+    page_params.realm_enable_spectator_access = false;
+    page_params.server_web_public_streams_enabled = false;
+    assert.equal(settings_data.user_can_create_web_public_streams(), false);
+
+    page_params.realm_enable_spectator_access = true;
+    page_params.server_web_public_streams_enabled = true;
+    page_params.is_owner = false;
+    page_params.is_admin = true;
+    assert.equal(settings_data.user_can_create_web_public_streams(), false);
+
+    page_params.realm_create_web_public_stream_policy =
+        settings_config.create_web_public_stream_policy_values.by_admins_only.code;
+    assert.equal(settings_data.user_can_create_web_public_streams(), true);
+
+    page_params.is_admin = false;
+    page_params.is_moderator = true;
+    assert.equal(settings_data.user_can_create_web_public_streams(), false);
+
+    page_params.realm_create_web_public_stream_policy =
+        settings_config.create_web_public_stream_policy_values.by_moderators_only.code;
+    assert.equal(settings_data.user_can_create_web_public_streams(), true);
+
+    page_params.is_moderator = false;
+    assert.equal(settings_data.user_can_create_web_public_streams(), false);
+});

static/js/page_params.ts

@@ -12,14 +12,17 @@ export const page_params: {
     is_admin: boolean;
     is_guest: boolean;
     is_moderator: boolean;
+    is_owner: boolean;
     is_spectator: boolean;
     realm_add_custom_emoji_policy: number;
     realm_avatar_changes_disabled: boolean;
     realm_create_private_stream_policy: number;
     realm_create_public_stream_policy: number;
+    realm_create_web_public_stream_policy: number;
     realm_delete_own_message_policy: number;
     realm_edit_topic_policy: number;
     realm_email_address_visibility: number;
+    realm_enable_spectator_access: boolean;
     realm_invite_to_realm_policy: number;
     realm_invite_to_stream_policy: number;
     realm_move_messages_between_streams_policy: number;
@@ -30,6 +33,7 @@ export const page_params: {
     request_language: string;
     server_avatar_changes_disabled: boolean;
     server_name_changes_disabled: boolean;
+    server_web_public_streams_enabled: boolean;
     translation_data: Record<string, string>;
     zulip_plan_is_not_limited: boolean;
 } = $("#page-params").remove().data("params");

static/js/settings_config.ts

@@ -227,6 +227,29 @@ export const wildcard_mention_policy_values = {
     },
 };
 
+export const create_web_public_stream_policy_values = {
+    by_moderators_only: {
+        order: 1,
+        code: 4,
+        description: $t({defaultMessage: "Admins and moderators"}),
+    },
+    by_admins_only: {
+        order: 2,
+        code: 2,
+        description: $t({defaultMessage: "Admins only"}),
+    },
+    by_owners_only: {
+        order: 3,
+        code: 7,
+        description: $t({defaultMessage: "Owners only"}),
+    },
+    nobody: {
+        order: 4,
+        code: 6,
+        description: $t({defaultMessage: "Nobody"}),
+    },
+};
+
 export const common_message_policy_values = {
     by_everyone: {
         order: 1,

static/js/settings_data.ts

@@ -181,6 +181,31 @@ export function user_can_create_public_streams(): boolean {
     return user_has_permission(page_params.realm_create_public_stream_policy);
 }
 
+export function user_can_create_web_public_streams(): boolean {
+    if (
+        !page_params.server_web_public_streams_enabled ||
+        !page_params.realm_enable_spectator_access
+    ) {
+        return false;
+    }
+
+    if (
+        page_params.realm_create_web_public_stream_policy ===
+        settings_config.create_web_public_stream_policy_values.nobody.code
+    ) {
+        return false;
+    }
+
+    if (
+        page_params.realm_create_web_public_stream_policy ===
+        settings_config.create_web_public_stream_policy_values.by_owners_only.code
+    ) {
+        return page_params.is_owner;
+    }
+
+    return user_has_permission(page_params.realm_create_web_public_stream_policy);
+}
+
 export function user_can_move_messages_between_streams(): boolean {
     return user_has_permission(page_params.realm_move_messages_between_streams_policy);
 }