Properly handle multiple lines targets (TXT, DKIM).

src/storage/zone.cr

@@ -212,6 +212,15 @@ class DNSManager::Storage::Zone
 
 			errors
 		end
+
+		def to_s(io : IO)
+			io << "(#{ "%4d" % @rrid }) "
+			io << "#{ "%30s" % @name} #{ "%6d" % @ttl} #{ "%10s" % @rrtype } #{quoted_string @target}\n"
+		end
+
+		def to_bind9(io : IO)
+			io << "#{@name} #{@ttl} IN #{@rrtype} #{split_line @target}\n"
+		end
 	end
 
 	class PTR < ResourceRecord
@@ -523,17 +532,11 @@ class DNSManager::Storage::Zone
 
 		def to_s(io : IO)
 			io << "(#{ "%4d" % @rrid }) "
-			io << "#{ "%30s" % @name} #{ "%6d" % @ttl} DKIM "
-			io << "( "
-			io << split_line dkim.to_s
-			io << " )\n"
+			io << "#{ "%30s" % @name} #{ "%6d" % @ttl} DKIM #{split_line dkim.to_s}\n"
 		end
 
 		def to_bind9(io : IO)
-			io << "#{@name} #{@ttl} IN TXT "
-			io << "( "
-			io << split_line dkim.to_s
-			io << " )\n"
+			io << "#{@name} #{@ttl} IN TXT #{split_line dkim.to_s}\n"
 		end
 	end
 
@@ -832,16 +835,30 @@ def qualifier_to_string(qualifier : DNSManager::Storage::Zone::SPF::Qualifier) :
 end
 
 def split_line(line : String) : String
+	max_char_per_line = 50
+
 	iostr = IO::Memory.new line
-	slice = Bytes.new(50)
+	slice = Bytes.new(max_char_per_line)
 	lines = ""
+	first_time = true
 	while rbytes = iostr.read slice
 		break if rbytes == 0
-		lines += '"'
-		lines += String.new slice[0..rbytes -1]
-		lines += '"'
-		lines += "\n\t"
+		if first_time
+			first_time = false
+		else
+			lines += "\n\t"
+		end
+		lines += quoted_string (String.new slice[0..rbytes -1])
 	end
 
+	lines = "( #{lines} )" if lines.size > max_char_per_line
 	lines
 end
+
+def quoted_string(value : String) : String
+	String.build do |io|
+		io << '"'
+		io << value
+		io << '"'
+	end
+end