Added max_size in the configuration file

README.md

@@ -13,8 +13,17 @@ The unique ID of a paste is obtained from the SHA256 of the
 concatenation of title, time, and content. Rendering is minimal, but
 can be enhanced. 
 
+`binit` is currently configured through a simple key=value
+configuration file. The available options are:
+
+* host (the hostname to listen on)
+* port (the port to bind)
+* paste\_dir (the folder where pastes are kept)
+* templ\_dir (the folder where HTML files and templates are kept)
+* max_size (the maximum allowed length of a paste, in bytes. Larger
+    pastes will be trimmed to that length)
+
+
 ### TODO
 
-* Check maximum paste length
-* Add a config file (hostname, port, pastedir)
 * Add a simple template system

binit.cfg

@@ -2,7 +2,17 @@
 ## These are comments
 ##
 
+## host/IP
 host=localhost
+
+## Port number
 port=8080
+
+## Directory where all pastes are kept
 paste_dir=./pastes
+
+## Directory where HTML files and templates are kept
 templ_dir=./html
+
+## max size of a paste, in bytes (cannot exceed 65535)
+max_size=16384

config.go

@@ -7,7 +7,7 @@ import (
 	"bufio"
 	"regexp"
 	"strings"
-	"log"
+	"strconv"
 )
 
 
@@ -17,7 +17,7 @@ type Config struct {
 	paste_dir string
 	templ_dir string
 	log_fname string
-	logger *log.Logger
+	max_size uint16
 }
 
 
@@ -29,6 +29,8 @@ func (c Config) String() string {
 	s+= "Port: " + c.port + "\n"
 	s+= "paste_dir: " + c.paste_dir + "\n"
 	s+= "templ_dir: " + c.templ_dir + "\n"
+	s+= "log_fname: " + c.log_fname + "\n"
+	s+= "max_size: " + string(c.max_size) + "\n"
 
 	return s
 	
@@ -66,6 +68,13 @@ func parse_config (fname string, c *Config) error {
 						c.templ_dir = fields[1]
 					case "log_fname":
 						c.log_fname = fields[1]
+					case "max_size":
+						if m_size, err := strconv.ParseUint(fields[1], 10, 16); err == nil {
+							c.max_size = uint16(m_size)
+						} else {
+							fmt.Fprintf(os.Stderr, "Invalid max_size value %s at line %d (max: 65535)\n",
+								fields[1], line)
+						}
 					default:
 						fmt.Fprintf(os.Stderr, "Error reading config file %s at line %d: unknown variable '%s'\n",
 							fname, line, fields[0])

main.go

@@ -19,10 +19,20 @@ var p_conf = Config{
 	paste_dir: "./pastes",
 	templ_dir: "./tmpl",
 	log_fname: "./binit.log",
+	max_size: 4096,
 }
 
 
 
+func min (a, b int) int {
+
+	if a > b {
+		return b
+	} else {
+		return a
+	}
+
+}
 
 func handle_get_paste(w http.ResponseWriter, r *http.Request) {
 
@@ -70,6 +80,9 @@ func handle_put_paste(w http.ResponseWriter, r *http.Request) {
 		paste := req_body.Get("paste")
 		now := time.Now().String()
 		// format content
+
+		paste = paste[0:min(len(paste), int(p_conf.max_size))]
+		
 		content := fmt.Sprintf("# Title: %s\n# Pasted: %s\n------------\n%s", title, now, paste)
 
 		// ccompute the sha256 hash using title, body, and time
@@ -138,6 +151,7 @@ func main() {
 	log.Printf("  + listening on: %s:%s\n", p_conf.host, p_conf.port )
 	log.Printf("  + paste_dir: %s\n", p_conf.paste_dir)
 	log.Printf("  + templ_dir: %s\n", p_conf.templ_dir)
+	log.Printf("  + max_size: %d\n", p_conf.max_size)
 
 	
 	http.HandleFunc("/", req_handler)