luci-app-snmpd: add MIB download area

This commit adds a new tab to download all mib files that are stored
in /usr/share/snmp/mibs folder.

Signed-off-by: Christian Korber <ckorber@tdt.de>

applications/luci-app-snmpd/htdocs/luci-static/resources/view/snmpd/download.js

@@ -0,0 +1,83 @@
+'use strict';
+'require form';
+'require fs';
+'require rpc';
+'require ui';
+'require view';
+
+var mapdata = { actions: {} };
+
+var mibDownload = rpc.declare({
+	object: 'file',
+	method: 'read',
+	params: [ 'path' ],
+	expect: { data : '' },
+});
+
+return L.view.extend({
+	handleMIB: function(name) {
+		const base = '/usr/share/snmp/mibs/';
+		const fileName = name;
+		const a = document.createElement('a');
+
+		document.body.appendChild(a);
+		a.display = 'none';
+
+		return mibDownload(base + fileName, false).then(function(res) {
+			const data = res;
+			const file = new Blob( [data] , { type: 'text/plain'});
+			const fileUrl = window.URL.createObjectURL(file);
+
+			a.href = fileUrl;
+			a.download = fileName;
+			a.click();
+			document.body.removeChild(a);
+		});
+	},
+
+	load: function() {
+		return Promise.all([
+			L.resolveDefault(fs.list('/usr/share/snmp/mibs/'), [])
+			.then(function(entries) {
+				const files = [];
+				entries.forEach((elem) => {
+					if (elem.type == 'file' &&
+					elem.name.match(/MIB\.(mib|my|txt)$/i)) {
+						files.push(elem.name);
+					}
+				});
+				return files;
+			})
+		]);
+	},
+
+	render: function(data) {
+		let m, s, o, ss;
+		const files = data[0];
+
+		m = new form.JSONMap(mapdata, _('SNMP - MIB Download'),
+			'Here you can download SNMP-MIB files');
+
+		s = m.section(form.NamedSection, 'actions', _('Actions'));
+
+		o = s.option(form.SectionValue, 'actions',
+			form.NamedSection, 'actions', 'actions',
+			_('Download Area'));
+
+		ss = o.subsection;
+
+		files.forEach((elem) => {
+			o = ss.option(form.Button, 'dl_mib', _(elem),
+				_(''));
+			o.inputstyle = 'action important';
+			o.inputtitle = _('Download');
+			o.onclick = ui.createHandlerFn(this, this.handleMIB, elem);
+		});
+
+		return m.render();
+	},
+
+	handleSaveApply: null,
+	handleSave: null,
+	handleReset: null
+	});

applications/luci-app-snmpd/root/usr/share/luci/menu.d/luci-app-snmpd.json

@@ -1,13 +1,39 @@
 {
 	"admin/services/snmpd": {
 		"title": "SNMPD",
+		"order": 5,
 		"action": {
-			"type": "view",
+			"type": "alias",
-			"path": "snmpd/snmpd"
+			"path": "admin/services/snmpd/snmpd"
 		},
 		"depends": {
 			"acl": [ "luci-app-snmpd" ],
 			"uci": { "snmpd":  true }
 		}
+	},
+
+	"admin/services/snmpd/snmpd": {
+		"title": "SNMP",
+		"order": 10,
+		"action": {
+			"type": "view",
+			"path": "snmpd/snmpd"
+		},
+		"depends": {
+			"acl": [ "luci-app-snmpd" ]
+		}
+	},
+
+	"admin/services/snmpd/download": {
+		"title": "Download",
+		"order": 20,
+		"action": {
+			"type": "view",
+			"path": "snmpd/download"
+		},
+		"depends": {
+			"acl": [ "luci-app-snmpd" ],
+			"fs": [ { "/usr/share/snmp/mibs/": "directory" } ]
+		}
 	}
 }

applications/luci-app-snmpd/root/usr/share/rpcd/acl.d/luci-app-snmpd.json

@@ -2,7 +2,11 @@
 	"luci-app-snmpd": {
 		"description": "Grant UCI access for luci-app-snmpd",
 		"read": {
-			"uci": [ "snmpd" ]
+			"uci": [ "snmpd" ],
+			"file": {
+				"/usr/share/snmp/mibs/*": [ "read", "stat" ],
+				"/usr/bin/ldd /usr/lib/libnetsnmp.so.40": [ "exec" ]
+			}
 		},
 		"write": {
 			"uci": [ "snmpd" ]