support multi-line error messages in exceptions

install/ui/ipa.css

@@ -1112,6 +1112,13 @@ table.kerberos-key-status {
     background-color: #daa520;
 }
 
+.error-message-hinted {
+    color: red;
+    padding-top: 0.5em;
+    padding-bottom: 0.5em;
+    font-family: monospace;
+}
+
 /* ---- Table ---- */
 
 table.scrollable thead {

install/ui/ipa.js

@@ -1419,6 +1419,25 @@ IPA.error_dialog = function(spec) {
         that.visible_buttons = spec.visible_buttons || ['retry', 'cancel'];
     };
 
+    that.beautify_message = function(container, message) {
+        var lines = message.split(/\n/g);
+        var line_span;
+        for(var i=0; i<lines.length; i++) {
+            // multi-lined text may contain TAB character as first char of the line
+            // to hint at marking the whole line differently
+            if (lines[i].charAt(0) == '\t') {
+                line_span = $('<p />', {
+                    'class': 'error-message-hinted',
+                    text: lines[i].substr(1)
+                }).appendTo(container);
+            } else {
+                line_span = $('<p />', {
+                    text: lines[i]
+                }).appendTo(container);
+            }
+        }
+    };
+
     that.create = function() {
         if (that.error_thrown.url) {
             $('<p/>', {
@@ -1426,9 +1445,9 @@ IPA.error_dialog = function(spec) {
             }).appendTo(that.container);
         }
 
-        $('<p/>', {
+        var error_message = $('<div />', {});
-            html: that.error_thrown.message
+        that.beautify_message(error_message, that.error_thrown.message);
-        }).appendTo(that.container);
+        error_message.appendTo(that.container);
 
         if(that.errors && that.errors.length > 0) {
             //render errors
@@ -1457,9 +1476,9 @@ IPA.error_dialog = function(spec) {
             for(var i=0; i < that.errors.length; i++) {
                 var error = that.errors[i];
                 if(error.message) {
-                    var error_div = $('<li />', {
+                    var error_div = $('<li />', {});
-                        text: error.message
+                    that.beautify_message(error_div, error.message);
-                    }).appendTo(errors_container);
+                    error_div.appendTo(errors_container);
                 }
             }
 

ipalib/errors.py

@@ -265,11 +265,17 @@ class PublicError(StandardError):
                     )
                 self.format = format
             self.forwarded = False
-            self.msg = self.format % kw
+            def convert_keyword(value):
+                if isinstance(value, list):
+                    result=u'\n'.join(map(lambda line: unicode(line), value))
+                    return result
+                return value
+            kwargs = dict(map(lambda (k,v): (k, convert_keyword(v)), kw.items()))
+            self.msg = self.format % kwargs
             if isinstance(self.format, basestring):
-                self.strerror = ugettext(self.format) % kw
+                self.strerror = ugettext(self.format) % kwargs
             else:
-                self.strerror = self.format % kw
+                self.strerror = self.format % kwargs
         else:
             if isinstance(message, (Gettext, NGettext)):
                 message = unicode(message)