Allow change chars length and disable strikethrough (#57)

Gemfile.lock

@@ -1,7 +1,7 @@
 PATH
   remote: .
   specs:
-    rucaptcha (2.1.3)
+    rucaptcha (2.1.4)
       railties (>= 3.2)
 
 GEM

README.md

@@ -20,7 +20,6 @@ This is a Captcha gem for Rails Applications which generates captcha image by C
 - High performance.
 
 ## Usage
-
 Put rucaptcha in your `Gemfile`:
 
 ```
@@ -42,6 +41,10 @@ RuCaptcha.configure do
   # 默认：会从 Rails 配置的 cache_store 里面读取相同的配置信息，并尝试用可以运行的方式，用于存储验证码字符
   # 但如果是 [:null_store, :memory_store, :file_store] 之类的，你可以通过下面的配置项单独给 RuCaptcha 配置 cache_store
   self.cache_store = :mem_cache_store
+  # 验证码长度 length, 默认是 5, allows: [3,4,5,6,7]
+  # self.length = 5
+  # 验证码横线 line, 默认显示横线, default: true, allows: [true, false], 设置为false时, 横线不是显示, 验证码识别度高.
+  # self.line = true
 end
 ```
 
@@ -53,7 +56,7 @@ RuCaptcha 没有使用 Rails Session 来存储验证码信息，因为 Rails 的
 
 所以，我建议大家使用的时候，配置上 `cache_store` （详见 [Rails Guides 缓存配置部分](https://ruby-china.github.io/rails-guides/caching_with_rails.html#%E9%85%8D%E7%BD%AE)的文档）到一个 Memcached 或 Redis，这才是最佳实践。
 
-#  
+#
 (RuCaptha do not use Rails Session to store captcha information. As the default session is stored in Cookie in Rails, there's a [Replay attack](https://en.wikipedia.org/wiki/Replay_attack) bug which may causes capthcha being destroyed if we store captcha in Rails Session.
 
 So in my design I require RuCaptcha to configure a distributed backend storage scheme, such as Memcached, Redis or other cache_store schemes which support distribution.
@@ -61,7 +64,8 @@ So in my design I require RuCaptcha to configure a distributed backend storage s
 Meanwhile, for the ease of use, RuCapthca would try to use `:file_store` by default and store the capthca in `tmp/cache/rucaptcha/session` directory (kindly note that it's not working if deploy on multiple machine).
 
 For recommendation, configure the `cache_store`（more details on [Rails Guides Configuration of Cache Stores](http://guides.rubyonrails.org/caching_with_rails.html#configuration)） to Memcached or Redis, that would be the best practice.)
-# 
+
+#
 
 Controller `app/controller/account_controller.rb`
 

ext/rucaptcha/rucaptcha.c

@@ -1,6 +1,6 @@
 // http://github.com/ITikhonov/captcha
 const int gifsize;
-void captcha(unsigned char im[70*200], unsigned char l[6]);
+void captcha(unsigned char im[70*200], unsigned char l[8], int length, int i_line);
 void makegif(unsigned char im[70*200], unsigned char gif[gifsize], int style);
 
 #include <unistd.h>
@@ -152,18 +152,37 @@ static void filter(unsigned char im[70*200]) {
 
 static const char *letters="abcdafahijklmnopqrstuvwxyz";
 
-void captcha(unsigned char im[70*200], unsigned char l[6]) {
+void captcha(unsigned char im[70*200], unsigned char l[8], int length, int i_line) {
   unsigned char swr[200];
   uint8_t s1,s2;
 
   int f=open("/dev/urandom",O_RDONLY);
   read(f,l,5); read(f,swr,200); read(f,dr,sizeof(dr)); read(f,&s1,1); read(f,&s2,1);
   close(f);
+  memset(im,0xff,200*70); s1=s1&0x7f; s2=s2&0x3f;
 
-  memset(im,0xff,200*70); s1=s1&0x7f; s2=s2&0x3f; l[0]%=25; l[1]%=25; l[2]%=25; l[3]%=25; l[4]%=25; l[5]=0;
+  int x;
-  int p=30; p=letter(l[0],p,im,swr,s1,s2); p=letter(l[1],p,im,swr,s1,s2); p=letter(l[2],p,im,swr,s1,s2); p=letter(l[3],p,im,swr,s1,s2); letter(l[4],p,im,swr,s1,s2);
+  for(x=0;x<length;x++){
-  line(im,swr,s1); dots(im); // blur(im); // filter(im);
+    l[x]%=25;
-  l[0]=letters[l[0]]; l[1]=letters[l[1]]; l[2]=letters[l[2]]; l[3]=letters[l[3]]; l[4]=letters[l[4]];
+  }
+  for(x=length;x<8;x++){
+    l[length]=0;
+  }
+  //l[0]%=25; l[1]%=25; l[2]%=25; l[3]%=25; l[4]=0; // l[4]%=25; l[5]=0;
+  int p=30;
+  for(x=0;x<length;x++){
+    p=letter(l[x],p,im,swr,s1,s2);
+  }
+  //p=letter(l[0],p,im,swr,s1,s2); p=letter(l[1],p,im,swr,s1,s2); p=letter(l[2],p,im,swr,s1,s2); p=letter(l[3],p,im,swr,s1,s2); //letter(l[4],p,im,swr,s1,s2);
+  if (i_line == 1) {
+    line(im,swr,s1);
+  }
+  dots(im); // blur(im); // filter(im);
+
+  for(x=0;x<length;x++){
+    l[x]=letters[l[x]];
+  }
+  //l[1]=letters[l[1]]; l[2]=letters[l[2]]; l[3]=letters[l[3]]; //l[4]=letters[l[4]];
 }
 
 // #ifdef CAPTCHA
@@ -188,20 +207,22 @@ VALUE RuCaptcha = Qnil;
 
 void Init_rucaptcha();
 
-VALUE create(VALUE self, VALUE style);
+VALUE create(VALUE self, VALUE style, VALUE length, VALUE line);
 
 void Init_rucaptcha() {
   RuCaptcha = rb_define_module("RuCaptcha");
-  rb_define_singleton_method(RuCaptcha, "create", create, 1);
+  rb_define_singleton_method(RuCaptcha, "create", create, 3);
 }
 
-VALUE create(VALUE self, VALUE style) {
+VALUE create(VALUE self, VALUE style, VALUE length, VALUE line) {
-  char l[6];
+  char l[8];
   unsigned char im[80*200];
   unsigned char gif[gifsize];
   int i_style = FIX2INT(style);
+  int i_length = FIX2INT(length);
+  int i_line = FIX2INT(line);
 
-  captcha(im, l);
+  captcha(im, l, i_length, i_line);
   makegif(im, gif, i_style);
 
   VALUE result = rb_ary_new2(2);
@@ -211,4 +232,3 @@ VALUE create(VALUE self, VALUE style) {
   return result;
 }
 
-

lib/rucaptcha.rb

@@ -8,6 +8,7 @@ require 'rucaptcha/controller_helpers'
 require 'rucaptcha/view_helpers'
 require 'rucaptcha/cache'
 require 'rucaptcha/engine'
+require 'rucaptcha/errors/configuration'
 
 module RuCaptcha
   class << self
@@ -15,6 +16,8 @@ module RuCaptcha
       return @config if defined?(@config)
       @config = Configuration.new
       @config.style       = :colorful
+      @config.length    = 5
+      @config.line    = true
       @config.expires_in  = 2.minutes
       if Rails.application
         @config.cache_store = Rails.application.config.cache_store
@@ -31,7 +34,10 @@ module RuCaptcha
 
     def generate()
       style = config.style == :colorful ? 1 : 0
-      self.create(style)
+      length = config.length
+      raise Rucaptcha::Errors::Configuration, 'length config error, value must in 3..7' unless length.in?(3..7)
+      line = config.line ? 1 : 0
+      self.create(style, length, line)
     end
 
     def check_cache_store!

lib/rucaptcha/configuration.rb

@@ -7,5 +7,10 @@ module RuCaptcha
     attr_accessor :expires_in
     # Color style, default: :colorful, allows: [:colorful, :black_white]
     attr_accessor :style
+    # Captcha Digits: default 5, allows: [3,4,5,6,7]
+    attr_accessor :length
+    # rucaptcha line, default: true, allows: [true, false]
+    attr_accessor :line
+
   end
 end

lib/rucaptcha/errors/configuration.rb

@@ -0,0 +1,5 @@
+module Rucaptcha
+  module Errors
+    class Configuration < StandardError; end
+  end
+end

lib/rucaptcha/version.rb

@@ -1,3 +1,3 @@
 module RuCaptcha
-  VERSION = '2.1.3'
+  VERSION = '2.1.4'
 end

spec/captcha_spec.rb

@@ -12,17 +12,88 @@ describe RuCaptcha do
 
   describe '.create' do
     it 'should len equal config.len' do
-      res = RuCaptcha.create(0)
+      res = RuCaptcha.create(0, 5, 1)
       expect(res.length).to eq(2)
       expect(res[0].length).to eq(5)
       expect(res[1]).not_to eq(nil)
     end
 
     it 'should work with color style' do
-      res = RuCaptcha.create(1)
+      res = RuCaptcha.create(1, 5, 1)
       expect(res.length).to eq(2)
       expect(res[0].length).to eq(5)
       expect(res[1]).not_to eq(nil)
     end
+
+    it 'should raise when length not in 3..7 ' do
+      RuCaptcha.configure do
+        self.length = 2
+      end
+      #expect(RuCaptcha.generate()).to raise_error('length config error, value must in 3..7')
+      expect { RuCaptcha.generate() }.
+        to raise_error('length config error, value must in 3..7')
+      RuCaptcha.configure do
+        self.length = 5
+      end
+    end
+
+    it 'should work when length in 3..7 ' do
+      RuCaptcha.configure do
+        self.length = 5
+      end
+      res = RuCaptcha.generate()
+      expect(res.length).to eq(2)
+      expect(res[0].length).to eq(5)
+      expect(res[1]).not_to eq(nil)
+    end
+
+    it 'should len equal 3' do
+      res = RuCaptcha.create(1, 3, 1)
+      expect(res.length).to eq(2)
+      expect(res[0].length).to eq(3)
+      expect(res[1]).not_to eq(nil)
+    end
+
+    it 'should len equal 4' do
+      res = RuCaptcha.create(1, 4, 1)
+      expect(res.length).to eq(2)
+      expect(res[0].length).to eq(4)
+      expect(res[1]).not_to eq(nil)
+    end
+
+    it 'should len equal 5' do
+      res = RuCaptcha.create(1, 5, 1)
+      expect(res.length).to eq(2)
+      expect(res[0].length).to eq(5)
+      expect(res[1]).not_to eq(nil)
+    end
+
+    it 'should len equal 6' do
+      res = RuCaptcha.create(1, 6, 1)
+      expect(res.length).to eq(2)
+      expect(res[0].length).to eq(6)
+      expect(res[1]).not_to eq(nil)
+    end
+
+    it 'should len equal 7' do
+      res = RuCaptcha.create(1, 7, 0)
+      expect(res.length).to eq(2)
+      expect(res[0].length).to eq(7)
+      expect(res[1]).not_to eq(nil)
+    end
+
+    it 'should work with line true' do
+      res = RuCaptcha.create(1, 7, 1)
+      expect(res.length).to eq(2)
+      expect(res[0].length).to eq(7)
+      expect(res[1]).not_to eq(nil)
+    end
+
+    it 'should work with line false' do
+      res = RuCaptcha.create(1, 7, 0)
+      expect(res.length).to eq(2)
+      expect(res[0].length).to eq(7)
+      expect(res[1]).not_to eq(nil)
+    end
   end
 end