Captcha and design works.
Added captcha generation. As we're working without JS - there is no possibility to reload image, only if user will reload whole web page. Some design works - set monospace font for paste textarea (will use system-defined default monospace font) and lowered font size in paste views.
This commit is contained in:
parent
6150e3c1fd
commit
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8
Gopkg.lock
generated
8
Gopkg.lock
generated
@ -44,6 +44,12 @@
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packages = ["."]
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revision = "cbb64ac3d964b81592e64f957ad53df015803288"
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[[projects]]
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branch = "master"
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name = "github.com/dchest/captcha"
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packages = ["."]
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revision = "6a29415a8364ec2971fdc62d9e415ed53fc20410"
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[[projects]]
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name = "github.com/dgrijalva/jwt-go"
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packages = ["."]
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@ -174,6 +180,6 @@
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[solve-meta]
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analyzer-name = "dep"
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analyzer-version = 1
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inputs-digest = "0e162c63d4eebc3e71a0d1ebba784963b8aa60886a706e396bc9d35d7d12802f"
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inputs-digest = "2633c4577a85d689bec7db65efe6c7f4da249d49bad8bee68df1eb0ab037bdef"
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solver-name = "gps-cdcl"
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solver-version = 1
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@ -22,7 +22,7 @@ whistles, no websockets and even NO JAVASCRIPT!(*)
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Just issue:
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```
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go get -u -v github.com/pztrn/fastpastebin
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go get -u -v github.com/pztrn/fastpastebin/cmd/fastpastebin
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```
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This command can be used to update Fast Paste Bin.
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@ -31,6 +31,7 @@ import (
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// local
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"github.com/pztrn/fastpastebin/api/http/static"
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"github.com/pztrn/fastpastebin/captcha"
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// other
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"github.com/alecthomas/chroma/lexers"
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@ -54,5 +55,9 @@ func indexGet(ec echo.Context) error {
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html := strings.Replace(string(htmlRaw), "{lexers}", availableLexersSelectOpts, 1)
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// Captcha.
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captchaString := captcha.NewCaptcha()
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html = strings.Replace(html, "{captchaString}", captchaString, -1)
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return ec.HTML(http.StatusOK, html)
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}
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@ -1,5 +1,5 @@
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// Code generated by fileb0x at "2018-05-01 14:28:30.814103749 +0500 +05 m=+0.033880643" from config file "fileb0x.yml" DO NOT EDIT.
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// modification hash(173f89ae699d558787ec5f8317fe49c2.5c3b355fe5a9e5324e826569a62de332)
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// Code generated by fileb0x at "2018-05-01 17:43:41.900415103 +0500 +05 m=+0.037136047" from config file "fileb0x.yml" DO NOT EDIT.
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// modification hash(6b14c8cdfc1bdcdaa0abe70393080151.5c3b355fe5a9e5324e826569a62de332)
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package static
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File diff suppressed because one or more lines are too long
@ -1,5 +1,5 @@
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// Code generaTed by fileb0x at "2018-05-01 14:28:30.817594806 +0500 +05 m=+0.037371712" from config file "fileb0x.yml" DO NOT EDIT.
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// modified(2018-05-01 14:28:26.665088437 +0500 +05)
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// Code generaTed by fileb0x at "2018-05-01 17:43:21.659447306 +0500 +05 m=+0.033177939" from config file "fileb0x.yml" DO NOT EDIT.
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// modified(2018-05-01 17:43:05.438136251 +0500 +05)
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// original path: assets/paste.html
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package static
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@ -10,7 +10,7 @@ import (
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)
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// FilePasteHTML is "/paste.html"
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||||
var FilePasteHTML = []byte("\x3c\x21\x44\x4f\x43\x54\x59\x50\x45\x20\x68\x74\x6d\x6c\x3e\x0a\x3c\x68\x74\x6d\x6c\x3e\x0a\x0a\x3c\x68\x65\x61\x64\x3e\x0a\x20\x20\x20\x20\x3c\x6d\x65\x74\x61\x20\x63\x68\x61\x72\x73\x65\x74\x3d\x22\x75\x74\x66\x2d\x38\x22\x3e\x0a\x20\x20\x20\x20\x3c\x6d\x65\x74\x61\x20\x6e\x61\x6d\x65\x3d\x22\x76\x69\x65\x77\x70\x6f\x72\x74\x22\x20\x63\x6f\x6e\x74\x65\x6e\x74\x3d\x22\x77\x69\x64\x74\x68\x3d\x64\x65\x76\x69\x63\x65\x2d\x77\x69\x64\x74\x68\x2c\x20\x69\x6e\x69\x74\x69\x61\x6c\x2d\x73\x63\x61\x6c\x65\x3d\x31\x22\x3e\x0a\x20\x20\x20\x20\x3c\x74\x69\x74\x6c\x65\x3e\x46\x61\x73\x74\x20\x50\x61\x73\x74\x65\x20\x42\x69\x6e\x20\x2d\x20\x45\x52\x52\x4f\x52\x21\x3c\x2f\x74\x69\x74\x6c\x65\x3e\x0a\x20\x20\x20\x20\x3c\x6c\x69\x6e\x6b\x20\x72\x65\x6c\x3d\x22\x73\x74\x79\x6c\x65\x73\x68\x65\x65\x74\x22\x20\x68\x72\x65\x66\x3d\x22\x2f\x73\x74\x61\x74\x69\x63\x2f\x63\x73\x73\x2f\x62\x75\x6c\x6d\x61\x2d\x30\x2e\x37\x2e\x30\x2e\x6d\x69\x6e\x2e\x63\x73\x73\x22\x3e\x0a\x20\x20\x20\x20\x3c\x73\x63\x72\x69\x70\x74\x20\x64\x65\x66\x65\x72\x20\x73\x72\x63\x3d\x22\x2f\x73\x74\x61\x74\x69\x63\x2f\x6a\x73\x2f\x66\x6f\x6e\x74\x61\x77\x65\x73\x6f\x6d\x65\x2d\x35\x2e\x30\x2e\x37\x2e\x6a\x73\x22\x3e\x3c\x2f\x73\x63\x72\x69\x70\x74\x3e\x0a\x20\x20\x20\x20\x3c\x6c\x69\x6e\x6b\x20\x72\x65\x6c\x3d\x22\x73\x74\x79\x6c\x65\x73\x68\x65\x65\x74\x22\x20\x68\x72\x65\x66\x3d\x22\x2f\x73\x74\x61\x74\x69\x63\x2f\x63\x73\x73\x2f\x73\x74\x79\x6c\x65\x2e\x63\x73\x73\x22\x3e\x0a\x3c\x2f\x68\x65\x61\x64\x3e\x0a\x0a\x3c\x62\x6f\x64\x79\x3e\x0a\x20\x20\x20\x20\x3c\x6e\x61\x76\x20\x63\x6c\x61\x73\x73\x3d\x22\x6e\x61\x76\x62\x61\x72\x20\x69\x73\x2d\x64\x61\x72\x6b\x22\x3e\x0a\x20\x20\x20\x20\x20\x20\x20\x20\x3c\x64\x69\x76\x20\x63\x6c\x61\x73\x73\x3d\x22\x6e\x61\x76\x62\x61\x72\x2d\x62\x72\x61\x6e\x64\x22\x3e\x0a\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x3c\x61\x20\x63\x6c\x61\x73\x73\x3d\x22\x6e\x61\x76\x62\x61\x72\x2d\x69\x74\x65\x6d\x22\x20\x68\x72\x65\x66\x3d\x22\x2f\x22\x3e\x46\x61\x73\x74\x20\x50\x61\x73\x74\x65\x20\x42\x69\x6e\x3c\x2f\x61\x3e\x0a\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x3c\x64\x69\x76\x20\x63\x6c\x61\x73\x73\x3d\x22\x6e\x61\x76\x62\x61\x72\x2d\x62\x75\x72\x67\x65\x72\x20\x62\x75\x72\x67\x65\x72\x22\x20\x64\x61\x74\x61\x2d\x74\x61\x72\x67\x65\x74\x3d\x22\x6e\x61\x76\x62\x61\x72\x45\x78\x61\x6d\x70\x6c\x65\x54\x72\x61\x6e\x73\x70\x61\x72\x65\x6e\x74\x45\x78\x61\x6d\x70\x6c\x65\x22\x3e\x0a\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x3c\x73\x70\x61\x6e\x3e\x3c\x2f\x73\x70\x61\x6e\x3e\x0a\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x3c\x73\x70\x61\x6e\x3e\x3c\x2f\x73\x70\x61\x6e\x3e\x0a\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x3c\x73\x70\x61\x6e\x3e\x3c\x2f\x73\x70\x61\x6e\x3e\x0a\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x3c\x2f\x64\x69\x76\x3e\x0a\x20\x20\x20\x20\x20\x20\x20\x20\x3c\x2f\x64\x69\x76\x3e\x0a\x0a\x20\x20\x20\x20\x20\x20\x20\x20\x3c\x64\x69\x76\x20\x69\x64\x3d\x22\x6e\x61\x76\x62\x61\x72\x45\x78\x61\x6d\x70\x6c\x65\x54\x72\x61\x6e\x73\x70\x61\x72\x65\x6e\x74\x45\x78\x61\x6d\x70\x6c\x65\x22\x20\x63\x6c\x61\x73\x73\x3d\x22\x6e\x61\x76\x62\x61\x72\x2d\x6d\x65\x6e\x75\x22\x3e\x0a\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x3c\x64\x69\x76\x20\x63\x6c\x61\x73\x73\x3d\x22\x6e\x61\x76\x62\x61\x72\x2d\x73\x74\x61\x72\x74\x22\x3e\x0a\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x3c\x61\x20\x63\x6c\x61\x73\x73\x3d\x22\x6e\x61\x76\x62\x61\x72\x2d\x69\x74\x65\x6d\x22\x20\x68\x72\x65\x66\x3d\x22\x2f\x70\x61\x73\x74\x65\x73\x2f\x22\x3e\x0a\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x50\x61\x73\x74\x65\x73\x0a\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x3c\x2f\x61\x3e\x0a\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x3c\x2f\x64\x69\x76\x3e\x0a\x0a\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x3c\x64\x69\x76\x20\x63\x6c\x61\x73\x73\x3d\x22\x6e\x61\x76\x62\x61\x72\x2d\x65\x6e\x64\x22\x3e\x0a\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20\x3c\x2f\x64\x69\x76\x3e\x0a\x20\x20\x20\x20\x20\x20\x20\x20\x3c\x2f\x64\x69\x76\x3e\x0a\x20\x20\x20\x20\x3c\x2f\x6e\x61\x76\x3e\x0a\x20\x20\x20\x20\x3c\x73\x65\x63\x74\x69\x6f\x6e\x20\x63\x6c\x61\x73\x73\x3d\x22\x73\x65\x63\x74\x69\x6f\x6e\x20\x70\x61\x73\x74\x65\x2d\x64\x61\x74\x61\x22\x3e\x0a\x20\x20\x20\x20\x20\x20\x20\x20\x7b\x70\x61\x73\x74\x65\x64\x61\x74\x61\x7d\x0a\x20\x20\x20\x20\x3c\x2f\x73\x65\x63\x74\x69\x6f\x6e\x3e\x0a\x3c\x2f\x62\x6f\x64\x79\x3e\x0a\x0a\x3c\x2f\x68\x74\x6d\x6c\x3e")
|
||||
|
||||
func init() {
|
||||
|
||||
|
||||
@ -1,5 +1,5 @@
|
||||
// Code generaTed by fileb0x at "2018-04-30 12:45:53.117322185 +0500 +05 m=+0.017381722" from config file "fileb0x.yml" DO NOT EDIT.
|
||||
// modified(2018-04-30 12:45:50.434017895 +0500 +05)
|
||||
// Code generaTed by fileb0x at "2018-05-01 17:43:41.903107504 +0500 +05 m=+0.039828393" from config file "fileb0x.yml" DO NOT EDIT.
|
||||
// modified(2018-05-01 17:43:40.11480207 +0500 +05)
|
||||
// original path: assets/css/style.css
|
||||
|
||||
package static
|
||||
@ -10,7 +10,7 @@ import (
|
||||
)
|
||||
|
||||
// FileStaticCSSStyleCSS is "static/css/style.css"
|
||||
var FileStaticCSSStyleCSS = []byte("\x23\x70\x61\x73\x74\x65\x2d\x63\x6f\x6e\x74\x65\x6e\x74\x73\x20\x7b\x0a\x20\x20\x20\x20\x68\x65\x69\x67\x68\x74\x3a\x20\x39\x30\x76\x68\x3b\x0a\x7d")
|
||||
var FileStaticCSSStyleCSS = []byte("\x23\x70\x61\x73\x74\x65\x2d\x63\x6f\x6e\x74\x65\x6e\x74\x73\x20\x7b\x0a\x20\x20\x20\x20\x66\x6f\x6e\x74\x2d\x66\x61\x6d\x69\x6c\x79\x3a\x20\x6d\x6f\x6e\x6f\x73\x70\x61\x63\x65\x3b\x0a\x20\x20\x20\x20\x66\x6f\x6e\x74\x2d\x73\x69\x7a\x65\x3a\x20\x30\x2e\x39\x72\x65\x6d\x3b\x0a\x20\x20\x20\x20\x68\x65\x69\x67\x68\x74\x3a\x20\x39\x30\x76\x68\x3b\x0a\x7d\x0a\x0a\x2e\x70\x61\x73\x74\x65\x2d\x64\x61\x74\x61\x20\x7b\x0a\x20\x20\x20\x20\x66\x6f\x6e\x74\x2d\x73\x69\x7a\x65\x3a\x20\x30\x2e\x39\x72\x65\x6d\x3b\x0a\x7d")
|
||||
|
||||
func init() {
|
||||
|
||||
|
||||
@ -1,3 +1,9 @@
|
||||
#paste-contents {
|
||||
font-family: monospace;
|
||||
font-size: 0.9rem;
|
||||
height: 90vh;
|
||||
}
|
||||
|
||||
.paste-data {
|
||||
font-size: 0.9rem;
|
||||
}
|
||||
@ -82,6 +82,16 @@
|
||||
</div>
|
||||
</div>
|
||||
</div>
|
||||
<div class="field">
|
||||
<label for="paste-captcha">Captcha:</label>
|
||||
<div class="control">
|
||||
<p>
|
||||
<img id=image src="/captcha/{captchaString}.png" alt="Captcha image">
|
||||
</p>
|
||||
<input class="input" type="text" placeholder="Captcha solution" name="paste-captcha-solution" id="paste-captcha-solution">
|
||||
<input class="input is-hidden" type="text" name="paste-captcha-id" id="paste-captcha-id" readonly value="{captchaString}">
|
||||
</div>
|
||||
</div>
|
||||
<div class="field">
|
||||
<div class="control">
|
||||
<input class="button is-success" type="submit" value="Paste!">
|
||||
|
||||
@ -32,7 +32,7 @@
|
||||
</div>
|
||||
</div>
|
||||
</nav>
|
||||
<section class="section">
|
||||
<section class="section paste-data">
|
||||
{pastedata}
|
||||
</section>
|
||||
</body>
|
||||
|
||||
59
captcha/exported.go
Normal file
59
captcha/exported.go
Normal file
@ -0,0 +1,59 @@
|
||||
// Fast Paste Bin - uberfast and easy-to-use pastebin.
|
||||
//
|
||||
// Copyright (c) 2018, Stanislav N. aka pztrn and Fast Paste Bin
|
||||
// developers.
|
||||
//
|
||||
// Permission is hereby granted, free of charge, to any person obtaining
|
||||
// a copy of this software and associated documentation files (the
|
||||
// "Software"), to deal in the Software without restriction, including
|
||||
// without limitation the rights to use, copy, modify, merge, publish,
|
||||
// distribute, sublicense, and/or sell copies of the Software, and to
|
||||
// permit persons to whom the Software is furnished to do so, subject
|
||||
// to the following conditions:
|
||||
//
|
||||
// The above copyright notice and this permission notice shall be
|
||||
// included in all copies or substantial portions of the Software.
|
||||
//
|
||||
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||||
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
||||
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
|
||||
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
|
||||
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
|
||||
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
|
||||
// OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||||
|
||||
package captcha
|
||||
|
||||
import (
|
||||
"github.com/labstack/echo"
|
||||
// local
|
||||
"github.com/pztrn/fastpastebin/context"
|
||||
|
||||
// other
|
||||
"github.com/dchest/captcha"
|
||||
)
|
||||
|
||||
var (
|
||||
c *context.Context
|
||||
)
|
||||
|
||||
// New initializes captcha package and adds neccessary HTTP and API
|
||||
// endpoints.
|
||||
func New(cc *context.Context) {
|
||||
c = cc
|
||||
|
||||
// New paste.
|
||||
c.Echo.GET("/captcha/:id.png", echo.WrapHandler(captcha.Server(captcha.StdWidth, captcha.StdHeight)))
|
||||
}
|
||||
|
||||
// NewCaptcha creates new captcha string.
|
||||
func NewCaptcha() string {
|
||||
s := captcha.New()
|
||||
c.Logger.Debug().Msgf("Created new captcha string: %s", s)
|
||||
return s
|
||||
}
|
||||
|
||||
// Verify verifies captchas.
|
||||
func Verify(captchaString string, captchaSolution string) bool {
|
||||
return captcha.VerifyString(captchaString, captchaSolution)
|
||||
}
|
||||
@ -32,6 +32,7 @@ import (
|
||||
|
||||
// local
|
||||
"github.com/pztrn/fastpastebin/api"
|
||||
"github.com/pztrn/fastpastebin/captcha"
|
||||
"github.com/pztrn/fastpastebin/context"
|
||||
"github.com/pztrn/fastpastebin/database"
|
||||
"github.com/pztrn/fastpastebin/database/migrations"
|
||||
@ -59,6 +60,7 @@ func main() {
|
||||
api.New(c)
|
||||
api.InitializeAPI()
|
||||
|
||||
captcha.New(c)
|
||||
pastes.New(c)
|
||||
|
||||
// CTRL+C handler.
|
||||
|
||||
@ -36,6 +36,7 @@ import (
|
||||
|
||||
// local
|
||||
"github.com/pztrn/fastpastebin/api/http/static"
|
||||
"github.com/pztrn/fastpastebin/captcha"
|
||||
"github.com/pztrn/fastpastebin/pagination"
|
||||
|
||||
// other
|
||||
@ -44,6 +45,7 @@ import (
|
||||
htmlfmt "github.com/alecthomas/chroma/formatters/html"
|
||||
"github.com/alecthomas/chroma/lexers"
|
||||
"github.com/alecthomas/chroma/styles"
|
||||
//"github.com/dchest/captcha"
|
||||
"github.com/labstack/echo"
|
||||
)
|
||||
|
||||
@ -140,6 +142,13 @@ func pastePOST(ec echo.Context) error {
|
||||
return ec.HTML(http.StatusBadRequest, errhtmlAsString)
|
||||
}
|
||||
|
||||
// Verify captcha.
|
||||
if !captcha.Verify(params["paste-captcha-id"][0], params["paste-captcha-solution"][0]) {
|
||||
c.Logger.Debug().Msgf("Invalid captcha solution for captcha ID '%s': %s", params["paste-captcha-id"][0], params["paste-captcha-solution"][0])
|
||||
errhtmlAsString := strings.Replace(string(errhtml), "{error}", "Invalid captcha solution.", 1)
|
||||
return ec.HTML(http.StatusBadRequest, errhtmlAsString)
|
||||
}
|
||||
|
||||
paste := &Paste{
|
||||
Title: params["paste-title"][0],
|
||||
Data: params["paste-contents"][0],
|
||||
|
||||
8
vendor/github.com/dchest/captcha/.gitignore
generated
vendored
Normal file
8
vendor/github.com/dchest/captcha/.gitignore
generated
vendored
Normal file
@ -0,0 +1,8 @@
|
||||
# Generated test captchas
|
||||
capgen/*.png
|
||||
capgen/*.wav
|
||||
|
||||
# Programs
|
||||
capgen/capgen
|
||||
cangensounds/cangensounds
|
||||
capexample/capexample
|
||||
19
vendor/github.com/dchest/captcha/LICENSE
generated
vendored
Normal file
19
vendor/github.com/dchest/captcha/LICENSE
generated
vendored
Normal file
@ -0,0 +1,19 @@
|
||||
Copyright (c) 2011-2014 Dmitry Chestnykh <dmitry@codingrobots.com>
|
||||
|
||||
Permission is hereby granted, free of charge, to any person obtaining a copy
|
||||
of this software and associated documentation files (the "Software"), to deal
|
||||
in the Software without restriction, including without limitation the rights
|
||||
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
||||
copies of the Software, and to permit persons to whom the Software is
|
||||
furnished to do so, subject to the following conditions:
|
||||
|
||||
The above copyright notice and this permission notice shall be included in
|
||||
all copies or substantial portions of the Software.
|
||||
|
||||
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
||||
THE SOFTWARE.
|
||||
275
vendor/github.com/dchest/captcha/README.md
generated
vendored
Normal file
275
vendor/github.com/dchest/captcha/README.md
generated
vendored
Normal file
@ -0,0 +1,275 @@
|
||||
Package captcha
|
||||
=====================
|
||||
|
||||
import "github.com/dchest/captcha"
|
||||
|
||||
Package captcha implements generation and verification of image and audio
|
||||
CAPTCHAs.
|
||||
|
||||
A captcha solution is the sequence of digits 0-9 with the defined length.
|
||||
There are two captcha representations: image and audio.
|
||||
|
||||
An image representation is a PNG-encoded image with the solution printed on
|
||||
it in such a way that makes it hard for computers to solve it using OCR.
|
||||
|
||||
An audio representation is a WAVE-encoded (8 kHz unsigned 8-bit) sound with the
|
||||
spoken solution (currently in English, Russian, Chinese, and Japanese). To make
|
||||
it hard for computers to solve audio captcha, the voice that pronounces numbers
|
||||
has random speed and pitch, and there is a randomly generated background noise
|
||||
mixed into the sound.
|
||||
|
||||
This package doesn't require external files or libraries to generate captcha
|
||||
representations; it is self-contained.
|
||||
|
||||
To make captchas one-time, the package includes a memory storage that stores
|
||||
captcha ids, their solutions, and expiration time. Used captchas are removed
|
||||
from the store immediately after calling Verify or VerifyString, while
|
||||
unused captchas (user loaded a page with captcha, but didn't submit the
|
||||
form) are collected automatically after the predefined expiration time.
|
||||
Developers can also provide custom store (for example, which saves captcha
|
||||
ids and solutions in database) by implementing Store interface and
|
||||
registering the object with SetCustomStore.
|
||||
|
||||
Captchas are created by calling New, which returns the captcha id. Their
|
||||
representations, though, are created on-the-fly by calling WriteImage or
|
||||
WriteAudio functions. Created representations are not stored anywhere, but
|
||||
subsequent calls to these functions with the same id will write the same
|
||||
captcha solution. Reload function will create a new different solution for the
|
||||
provided captcha, allowing users to "reload" captcha if they can't solve the
|
||||
displayed one without reloading the whole page. Verify and VerifyString are
|
||||
used to verify that the given solution is the right one for the given captcha
|
||||
id.
|
||||
|
||||
Server provides an http.Handler which can serve image and audio
|
||||
representations of captchas automatically from the URL. It can also be used
|
||||
to reload captchas. Refer to Server function documentation for details, or
|
||||
take a look at the example in "capexample" subdirectory.
|
||||
|
||||
|
||||
Examples
|
||||
--------
|
||||
|
||||
|
||||
|
||||
[Audio](https://github.com/dchest/captcha/raw/master/capgen/example.wav)
|
||||
|
||||
|
||||
Constants
|
||||
---------
|
||||
|
||||
``` go
|
||||
const (
|
||||
// Default number of digits in captcha solution.
|
||||
DefaultLen = 6
|
||||
// The number of captchas created that triggers garbage collection used
|
||||
// by default store.
|
||||
CollectNum = 100
|
||||
// Expiration time of captchas used by default store.
|
||||
Expiration = 10 * time.Minute
|
||||
)
|
||||
```
|
||||
|
||||
``` go
|
||||
const (
|
||||
// Standard width and height of a captcha image.
|
||||
StdWidth = 240
|
||||
StdHeight = 80
|
||||
)
|
||||
```
|
||||
|
||||
|
||||
Variables
|
||||
---------
|
||||
|
||||
``` go
|
||||
var (
|
||||
ErrNotFound = errors.New("captcha: id not found")
|
||||
)
|
||||
```
|
||||
|
||||
|
||||
|
||||
Functions
|
||||
---------
|
||||
|
||||
### func New
|
||||
|
||||
func New() string
|
||||
|
||||
New creates a new captcha with the standard length, saves it in the internal
|
||||
storage and returns its id.
|
||||
|
||||
### func NewLen
|
||||
|
||||
func NewLen(length int) (id string)
|
||||
|
||||
NewLen is just like New, but accepts length of a captcha solution as the
|
||||
argument.
|
||||
|
||||
### func RandomDigits
|
||||
|
||||
func RandomDigits(length int) (b []byte)
|
||||
|
||||
RandomDigits returns a byte slice of the given length containing
|
||||
pseudorandom numbers in range 0-9. The slice can be used as a captcha
|
||||
solution.
|
||||
|
||||
### func Reload
|
||||
|
||||
func Reload(id string) bool
|
||||
|
||||
Reload generates and remembers new digits for the given captcha id. This
|
||||
function returns false if there is no captcha with the given id.
|
||||
|
||||
After calling this function, the image or audio presented to a user must be
|
||||
refreshed to show the new captcha representation (WriteImage and WriteAudio
|
||||
will write the new one).
|
||||
|
||||
### func Server
|
||||
|
||||
func Server(imgWidth, imgHeight int) http.Handler
|
||||
|
||||
Server returns a handler that serves HTTP requests with image or
|
||||
audio representations of captchas. Image dimensions are accepted as
|
||||
arguments. The server decides which captcha to serve based on the last URL
|
||||
path component: file name part must contain a captcha id, file extension —
|
||||
its format (PNG or WAV).
|
||||
|
||||
For example, for file name "LBm5vMjHDtdUfaWYXiQX.png" it serves an image captcha
|
||||
with id "LBm5vMjHDtdUfaWYXiQX", and for "LBm5vMjHDtdUfaWYXiQX.wav" it serves the
|
||||
same captcha in audio format.
|
||||
|
||||
To serve a captcha as a downloadable file, the URL must be constructed in
|
||||
such a way as if the file to serve is in the "download" subdirectory:
|
||||
"/download/LBm5vMjHDtdUfaWYXiQX.wav".
|
||||
|
||||
To reload captcha (get a different solution for the same captcha id), append
|
||||
"?reload=x" to URL, where x may be anything (for example, current time or a
|
||||
random number to make browsers refetch an image instead of loading it from
|
||||
cache).
|
||||
|
||||
By default, the Server serves audio in English language. To serve audio
|
||||
captcha in one of the other supported languages, append "lang" value, for
|
||||
example, "?lang=ru".
|
||||
|
||||
### func SetCustomStore
|
||||
|
||||
func SetCustomStore(s Store)
|
||||
|
||||
SetCustomStore sets custom storage for captchas, replacing the default
|
||||
memory store. This function must be called before generating any captchas.
|
||||
|
||||
### func Verify
|
||||
|
||||
func Verify(id string, digits []byte) bool
|
||||
|
||||
Verify returns true if the given digits are the ones that were used to
|
||||
create the given captcha id.
|
||||
|
||||
The function deletes the captcha with the given id from the internal
|
||||
storage, so that the same captcha can't be verified anymore.
|
||||
|
||||
### func VerifyString
|
||||
|
||||
func VerifyString(id string, digits string) bool
|
||||
|
||||
VerifyString is like Verify, but accepts a string of digits. It removes
|
||||
spaces and commas from the string, but any other characters, apart from
|
||||
digits and listed above, will cause the function to return false.
|
||||
|
||||
### func WriteAudio
|
||||
|
||||
func WriteAudio(w io.Writer, id string, lang string) error
|
||||
|
||||
WriteAudio writes WAV-encoded audio representation of the captcha with the
|
||||
given id and the given language. If there are no sounds for the given
|
||||
language, English is used.
|
||||
|
||||
### func WriteImage
|
||||
|
||||
func WriteImage(w io.Writer, id string, width, height int) error
|
||||
|
||||
WriteImage writes PNG-encoded image representation of the captcha with the
|
||||
given id. The image will have the given width and height.
|
||||
|
||||
|
||||
Types
|
||||
-----
|
||||
|
||||
``` go
|
||||
type Audio struct {
|
||||
// contains unexported fields
|
||||
}
|
||||
```
|
||||
|
||||
|
||||
### func NewAudio
|
||||
|
||||
func NewAudio(id string, digits []byte, lang string) *Audio
|
||||
|
||||
NewAudio returns a new audio captcha with the given digits, where each digit
|
||||
must be in range 0-9. Digits are pronounced in the given language. If there
|
||||
are no sounds for the given language, English is used.
|
||||
|
||||
Possible values for lang are "en", "ja", "ru", "zh".
|
||||
|
||||
### func (*Audio) EncodedLen
|
||||
|
||||
func (a *Audio) EncodedLen() int
|
||||
|
||||
EncodedLen returns the length of WAV-encoded audio captcha.
|
||||
|
||||
### func (*Audio) WriteTo
|
||||
|
||||
func (a *Audio) WriteTo(w io.Writer) (n int64, err error)
|
||||
|
||||
WriteTo writes captcha audio in WAVE format into the given io.Writer, and
|
||||
returns the number of bytes written and an error if any.
|
||||
|
||||
``` go
|
||||
type Image struct {
|
||||
*image.Paletted
|
||||
// contains unexported fields
|
||||
}
|
||||
```
|
||||
|
||||
|
||||
### func NewImage
|
||||
|
||||
func NewImage(id string, digits []byte, width, height int) *Image
|
||||
|
||||
NewImage returns a new captcha image of the given width and height with the
|
||||
given digits, where each digit must be in range 0-9.
|
||||
|
||||
### func (*Image) WriteTo
|
||||
|
||||
func (m *Image) WriteTo(w io.Writer) (int64, error)
|
||||
|
||||
WriteTo writes captcha image in PNG format into the given writer.
|
||||
|
||||
``` go
|
||||
type Store interface {
|
||||
// Set sets the digits for the captcha id.
|
||||
Set(id string, digits []byte)
|
||||
|
||||
// Get returns stored digits for the captcha id. Clear indicates
|
||||
// whether the captcha must be deleted from the store.
|
||||
Get(id string, clear bool) (digits []byte)
|
||||
}
|
||||
```
|
||||
|
||||
An object implementing Store interface can be registered with SetCustomStore
|
||||
function to handle storage and retrieval of captcha ids and solutions for
|
||||
them, replacing the default memory store.
|
||||
|
||||
It is the responsibility of an object to delete expired and used captchas
|
||||
when necessary (for example, the default memory store collects them in Set
|
||||
method after the certain amount of captchas has been stored.)
|
||||
|
||||
### func NewMemoryStore
|
||||
|
||||
func NewMemoryStore(collectNum int, expiration time.Duration) Store
|
||||
|
||||
NewMemoryStore returns a new standard memory store for captchas with the
|
||||
given collection threshold and expiration time in seconds. The returned
|
||||
store must be registered with SetCustomStore to replace the default one.
|
||||
232
vendor/github.com/dchest/captcha/audio.go
generated
vendored
Normal file
232
vendor/github.com/dchest/captcha/audio.go
generated
vendored
Normal file
@ -0,0 +1,232 @@
|
||||
// Copyright 2011-2014 Dmitry Chestnykh. All rights reserved.
|
||||
// Use of this source code is governed by a MIT-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package captcha
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"encoding/binary"
|
||||
"io"
|
||||
"math"
|
||||
)
|
||||
|
||||
const sampleRate = 8000 // Hz
|
||||
|
||||
var endingBeepSound []byte
|
||||
|
||||
func init() {
|
||||
endingBeepSound = changeSpeed(beepSound, 1.4)
|
||||
}
|
||||
|
||||
type Audio struct {
|
||||
body *bytes.Buffer
|
||||
digitSounds [][]byte
|
||||
rng siprng
|
||||
}
|
||||
|
||||
// NewAudio returns a new audio captcha with the given digits, where each digit
|
||||
// must be in range 0-9. Digits are pronounced in the given language. If there
|
||||
// are no sounds for the given language, English is used.
|
||||
//
|
||||
// Possible values for lang are "en", "ja", "ru", "zh".
|
||||
func NewAudio(id string, digits []byte, lang string) *Audio {
|
||||
a := new(Audio)
|
||||
|
||||
// Initialize PRNG.
|
||||
a.rng.Seed(deriveSeed(audioSeedPurpose, id, digits))
|
||||
|
||||
if sounds, ok := digitSounds[lang]; ok {
|
||||
a.digitSounds = sounds
|
||||
} else {
|
||||
a.digitSounds = digitSounds["en"]
|
||||
}
|
||||
numsnd := make([][]byte, len(digits))
|
||||
nsdur := 0
|
||||
for i, n := range digits {
|
||||
snd := a.randomizedDigitSound(n)
|
||||
nsdur += len(snd)
|
||||
numsnd[i] = snd
|
||||
}
|
||||
// Random intervals between digits (including beginning).
|
||||
intervals := make([]int, len(digits)+1)
|
||||
intdur := 0
|
||||
for i := range intervals {
|
||||
dur := a.rng.Int(sampleRate, sampleRate*3) // 1 to 3 seconds
|
||||
intdur += dur
|
||||
intervals[i] = dur
|
||||
}
|
||||
// Generate background sound.
|
||||
bg := a.makeBackgroundSound(a.longestDigitSndLen()*len(digits) + intdur)
|
||||
// Create buffer and write audio to it.
|
||||
sil := makeSilence(sampleRate / 5)
|
||||
bufcap := 3*len(beepSound) + 2*len(sil) + len(bg) + len(endingBeepSound)
|
||||
a.body = bytes.NewBuffer(make([]byte, 0, bufcap))
|
||||
// Write prelude, three beeps.
|
||||
a.body.Write(beepSound)
|
||||
a.body.Write(sil)
|
||||
a.body.Write(beepSound)
|
||||
a.body.Write(sil)
|
||||
a.body.Write(beepSound)
|
||||
// Write digits.
|
||||
pos := intervals[0]
|
||||
for i, v := range numsnd {
|
||||
mixSound(bg[pos:], v)
|
||||
pos += len(v) + intervals[i+1]
|
||||
}
|
||||
a.body.Write(bg)
|
||||
// Write ending (one beep).
|
||||
a.body.Write(endingBeepSound)
|
||||
return a
|
||||
}
|
||||
|
||||
// WriteTo writes captcha audio in WAVE format into the given io.Writer, and
|
||||
// returns the number of bytes written and an error if any.
|
||||
func (a *Audio) WriteTo(w io.Writer) (n int64, err error) {
|
||||
// Calculate padded length of PCM chunk data.
|
||||
bodyLen := uint32(a.body.Len())
|
||||
paddedBodyLen := bodyLen
|
||||
if bodyLen%2 != 0 {
|
||||
paddedBodyLen++
|
||||
}
|
||||
totalLen := uint32(len(waveHeader)) - 4 + paddedBodyLen
|
||||
// Header.
|
||||
header := make([]byte, len(waveHeader)+4) // includes 4 bytes for chunk size
|
||||
copy(header, waveHeader)
|
||||
// Put the length of whole RIFF chunk.
|
||||
binary.LittleEndian.PutUint32(header[4:], totalLen)
|
||||
// Put the length of WAVE chunk.
|
||||
binary.LittleEndian.PutUint32(header[len(waveHeader):], bodyLen)
|
||||
// Write header.
|
||||
nn, err := w.Write(header)
|
||||
n = int64(nn)
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
// Write data.
|
||||
n, err = a.body.WriteTo(w)
|
||||
n += int64(nn)
|
||||
if err != nil {
|
||||
return
|
||||
}
|
||||
// Pad byte if chunk length is odd.
|
||||
// (As header has even length, we can check if n is odd, not chunk).
|
||||
if bodyLen != paddedBodyLen {
|
||||
w.Write([]byte{0})
|
||||
n++
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
// EncodedLen returns the length of WAV-encoded audio captcha.
|
||||
func (a *Audio) EncodedLen() int {
|
||||
return len(waveHeader) + 4 + a.body.Len()
|
||||
}
|
||||
|
||||
func (a *Audio) makeBackgroundSound(length int) []byte {
|
||||
b := a.makeWhiteNoise(length, 4)
|
||||
for i := 0; i < length/(sampleRate/10); i++ {
|
||||
snd := reversedSound(a.digitSounds[a.rng.Intn(10)])
|
||||
snd = changeSpeed(snd, a.rng.Float(0.8, 1.4))
|
||||
place := a.rng.Intn(len(b) - len(snd))
|
||||
setSoundLevel(snd, a.rng.Float(0.2, 0.5))
|
||||
mixSound(b[place:], snd)
|
||||
}
|
||||
return b
|
||||
}
|
||||
|
||||
func (a *Audio) randomizedDigitSound(n byte) []byte {
|
||||
s := a.randomSpeed(a.digitSounds[n])
|
||||
setSoundLevel(s, a.rng.Float(0.75, 1.2))
|
||||
return s
|
||||
}
|
||||
|
||||
func (a *Audio) longestDigitSndLen() int {
|
||||
n := 0
|
||||
for _, v := range a.digitSounds {
|
||||
if n < len(v) {
|
||||
n = len(v)
|
||||
}
|
||||
}
|
||||
return n
|
||||
}
|
||||
|
||||
func (a *Audio) randomSpeed(b []byte) []byte {
|
||||
pitch := a.rng.Float(0.9, 1.2)
|
||||
return changeSpeed(b, pitch)
|
||||
}
|
||||
|
||||
func (a *Audio) makeWhiteNoise(length int, level uint8) []byte {
|
||||
noise := a.rng.Bytes(length)
|
||||
adj := 128 - level/2
|
||||
for i, v := range noise {
|
||||
v %= level
|
||||
v += adj
|
||||
noise[i] = v
|
||||
}
|
||||
return noise
|
||||
}
|
||||
|
||||
// mixSound mixes src into dst. Dst must have length equal to or greater than
|
||||
// src length.
|
||||
func mixSound(dst, src []byte) {
|
||||
for i, v := range src {
|
||||
av := int(v)
|
||||
bv := int(dst[i])
|
||||
if av < 128 && bv < 128 {
|
||||
dst[i] = byte(av * bv / 128)
|
||||
} else {
|
||||
dst[i] = byte(2*(av+bv) - av*bv/128 - 256)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func setSoundLevel(a []byte, level float64) {
|
||||
for i, v := range a {
|
||||
av := float64(v)
|
||||
switch {
|
||||
case av > 128:
|
||||
if av = (av-128)*level + 128; av < 128 {
|
||||
av = 128
|
||||
}
|
||||
case av < 128:
|
||||
if av = 128 - (128-av)*level; av > 128 {
|
||||
av = 128
|
||||
}
|
||||
default:
|
||||
continue
|
||||
}
|
||||
a[i] = byte(av)
|
||||
}
|
||||
}
|
||||
|
||||
// changeSpeed returns new PCM bytes from the bytes with the speed and pitch
|
||||
// changed to the given value that must be in range [0, x].
|
||||
func changeSpeed(a []byte, speed float64) []byte {
|
||||
b := make([]byte, int(math.Floor(float64(len(a))*speed)))
|
||||
var p float64
|
||||
for _, v := range a {
|
||||
for i := int(p); i < int(p+speed); i++ {
|
||||
b[i] = v
|
||||
}
|
||||
p += speed
|
||||
}
|
||||
return b
|
||||
}
|
||||
|
||||
func makeSilence(length int) []byte {
|
||||
b := make([]byte, length)
|
||||
for i := range b {
|
||||
b[i] = 128
|
||||
}
|
||||
return b
|
||||
}
|
||||
|
||||
func reversedSound(a []byte) []byte {
|
||||
n := len(a)
|
||||
b := make([]byte, n)
|
||||
for i, v := range a {
|
||||
b[n-1-i] = v
|
||||
}
|
||||
return b
|
||||
}
|
||||
165
vendor/github.com/dchest/captcha/captcha.go
generated
vendored
Normal file
165
vendor/github.com/dchest/captcha/captcha.go
generated
vendored
Normal file
@ -0,0 +1,165 @@
|
||||
// Copyright 2011 Dmitry Chestnykh. All rights reserved.
|
||||
// Use of this source code is governed by a MIT-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
// Package captcha implements generation and verification of image and audio
|
||||
// CAPTCHAs.
|
||||
//
|
||||
// A captcha solution is the sequence of digits 0-9 with the defined length.
|
||||
// There are two captcha representations: image and audio.
|
||||
//
|
||||
// An image representation is a PNG-encoded image with the solution printed on
|
||||
// it in such a way that makes it hard for computers to solve it using OCR.
|
||||
//
|
||||
// An audio representation is a WAVE-encoded (8 kHz unsigned 8-bit) sound with
|
||||
// the spoken solution (currently in English, Russian, Chinese, and Japanese).
|
||||
// To make it hard for computers to solve audio captcha, the voice that
|
||||
// pronounces numbers has random speed and pitch, and there is a randomly
|
||||
// generated background noise mixed into the sound.
|
||||
//
|
||||
// This package doesn't require external files or libraries to generate captcha
|
||||
// representations; it is self-contained.
|
||||
//
|
||||
// To make captchas one-time, the package includes a memory storage that stores
|
||||
// captcha ids, their solutions, and expiration time. Used captchas are removed
|
||||
// from the store immediately after calling Verify or VerifyString, while
|
||||
// unused captchas (user loaded a page with captcha, but didn't submit the
|
||||
// form) are collected automatically after the predefined expiration time.
|
||||
// Developers can also provide custom store (for example, which saves captcha
|
||||
// ids and solutions in database) by implementing Store interface and
|
||||
// registering the object with SetCustomStore.
|
||||
//
|
||||
// Captchas are created by calling New, which returns the captcha id. Their
|
||||
// representations, though, are created on-the-fly by calling WriteImage or
|
||||
// WriteAudio functions. Created representations are not stored anywhere, but
|
||||
// subsequent calls to these functions with the same id will write the same
|
||||
// captcha solution. Reload function will create a new different solution for
|
||||
// the provided captcha, allowing users to "reload" captcha if they can't solve
|
||||
// the displayed one without reloading the whole page. Verify and VerifyString
|
||||
// are used to verify that the given solution is the right one for the given
|
||||
// captcha id.
|
||||
//
|
||||
// Server provides an http.Handler which can serve image and audio
|
||||
// representations of captchas automatically from the URL. It can also be used
|
||||
// to reload captchas. Refer to Server function documentation for details, or
|
||||
// take a look at the example in "capexample" subdirectory.
|
||||
package captcha
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"errors"
|
||||
"io"
|
||||
"time"
|
||||
)
|
||||
|
||||
const (
|
||||
// Default number of digits in captcha solution.
|
||||
DefaultLen = 6
|
||||
// The number of captchas created that triggers garbage collection used
|
||||
// by default store.
|
||||
CollectNum = 100
|
||||
// Expiration time of captchas used by default store.
|
||||
Expiration = 10 * time.Minute
|
||||
)
|
||||
|
||||
var (
|
||||
ErrNotFound = errors.New("captcha: id not found")
|
||||
// globalStore is a shared storage for captchas, generated by New function.
|
||||
globalStore = NewMemoryStore(CollectNum, Expiration)
|
||||
)
|
||||
|
||||
// SetCustomStore sets custom storage for captchas, replacing the default
|
||||
// memory store. This function must be called before generating any captchas.
|
||||
func SetCustomStore(s Store) {
|
||||
globalStore = s
|
||||
}
|
||||
|
||||
// New creates a new captcha with the standard length, saves it in the internal
|
||||
// storage and returns its id.
|
||||
func New() string {
|
||||
return NewLen(DefaultLen)
|
||||
}
|
||||
|
||||
// NewLen is just like New, but accepts length of a captcha solution as the
|
||||
// argument.
|
||||
func NewLen(length int) (id string) {
|
||||
id = randomId()
|
||||
globalStore.Set(id, RandomDigits(length))
|
||||
return
|
||||
}
|
||||
|
||||
// Reload generates and remembers new digits for the given captcha id. This
|
||||
// function returns false if there is no captcha with the given id.
|
||||
//
|
||||
// After calling this function, the image or audio presented to a user must be
|
||||
// refreshed to show the new captcha representation (WriteImage and WriteAudio
|
||||
// will write the new one).
|
||||
func Reload(id string) bool {
|
||||
old := globalStore.Get(id, false)
|
||||
if old == nil {
|
||||
return false
|
||||
}
|
||||
globalStore.Set(id, RandomDigits(len(old)))
|
||||
return true
|
||||
}
|
||||
|
||||
// WriteImage writes PNG-encoded image representation of the captcha with the
|
||||
// given id. The image will have the given width and height.
|
||||
func WriteImage(w io.Writer, id string, width, height int) error {
|
||||
d := globalStore.Get(id, false)
|
||||
if d == nil {
|
||||
return ErrNotFound
|
||||
}
|
||||
_, err := NewImage(id, d, width, height).WriteTo(w)
|
||||
return err
|
||||
}
|
||||
|
||||
// WriteAudio writes WAV-encoded audio representation of the captcha with the
|
||||
// given id and the given language. If there are no sounds for the given
|
||||
// language, English is used.
|
||||
func WriteAudio(w io.Writer, id string, lang string) error {
|
||||
d := globalStore.Get(id, false)
|
||||
if d == nil {
|
||||
return ErrNotFound
|
||||
}
|
||||
_, err := NewAudio(id, d, lang).WriteTo(w)
|
||||
return err
|
||||
}
|
||||
|
||||
// Verify returns true if the given digits are the ones that were used to
|
||||
// create the given captcha id.
|
||||
//
|
||||
// The function deletes the captcha with the given id from the internal
|
||||
// storage, so that the same captcha can't be verified anymore.
|
||||
func Verify(id string, digits []byte) bool {
|
||||
if digits == nil || len(digits) == 0 {
|
||||
return false
|
||||
}
|
||||
reald := globalStore.Get(id, true)
|
||||
if reald == nil {
|
||||
return false
|
||||
}
|
||||
return bytes.Equal(digits, reald)
|
||||
}
|
||||
|
||||
// VerifyString is like Verify, but accepts a string of digits. It removes
|
||||
// spaces and commas from the string, but any other characters, apart from
|
||||
// digits and listed above, will cause the function to return false.
|
||||
func VerifyString(id string, digits string) bool {
|
||||
if digits == "" {
|
||||
return false
|
||||
}
|
||||
ns := make([]byte, len(digits))
|
||||
for i := range ns {
|
||||
d := digits[i]
|
||||
switch {
|
||||
case '0' <= d && d <= '9':
|
||||
ns[i] = d - '0'
|
||||
case d == ' ' || d == ',':
|
||||
// ignore
|
||||
default:
|
||||
return false
|
||||
}
|
||||
}
|
||||
return Verify(id, ns)
|
||||
}
|
||||
214
vendor/github.com/dchest/captcha/font.go
generated
vendored
Normal file
214
vendor/github.com/dchest/captcha/font.go
generated
vendored
Normal file
@ -0,0 +1,214 @@
|
||||
// Copyright 2011 Dmitry Chestnykh. All rights reserved.
|
||||
// Use of this source code is governed by a MIT-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package captcha
|
||||
|
||||
const (
|
||||
fontWidth = 11
|
||||
fontHeight = 18
|
||||
blackChar = 1
|
||||
)
|
||||
|
||||
var font = [][]byte{
|
||||
{ // 0
|
||||
0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0,
|
||||
0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0,
|
||||
0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0,
|
||||
0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1,
|
||||
0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0,
|
||||
0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0,
|
||||
0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0,
|
||||
},
|
||||
{ // 1
|
||||
0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 1, 1, 0, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
|
||||
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
||||
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
||||
},
|
||||
{ // 2
|
||||
0, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0,
|
||||
0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
|
||||
1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0,
|
||||
0, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0,
|
||||
0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0,
|
||||
0, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
||||
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
||||
},
|
||||
{ // 3
|
||||
0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0,
|
||||
1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
|
||||
1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0,
|
||||
0, 0, 1, 1, 1, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1,
|
||||
1, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0,
|
||||
1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
|
||||
0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0,
|
||||
},
|
||||
{ // 4
|
||||
0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0,
|
||||
0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0,
|
||||
0, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0,
|
||||
0, 0, 0, 0, 1, 1, 0, 1, 1, 0, 0,
|
||||
0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0,
|
||||
0, 0, 0, 1, 1, 0, 0, 1, 1, 0, 0,
|
||||
0, 0, 1, 1, 0, 0, 0, 1, 1, 0, 0,
|
||||
0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0,
|
||||
0, 1, 1, 0, 0, 0, 0, 1, 1, 0, 0,
|
||||
1, 1, 0, 0, 0, 0, 0, 1, 1, 0, 0,
|
||||
1, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
|
||||
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
||||
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
||||
0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
|
||||
},
|
||||
{ // 5
|
||||
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
|
||||
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
|
||||
0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0,
|
||||
0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 0,
|
||||
1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
|
||||
0, 0, 1, 1, 1, 1, 1, 1, 0, 0, 0,
|
||||
},
|
||||
{ // 6
|
||||
0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 0,
|
||||
0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 0,
|
||||
0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0,
|
||||
0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
1, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0,
|
||||
1, 1, 0, 1, 1, 1, 1, 1, 1, 1, 0,
|
||||
1, 1, 1, 1, 0, 0, 0, 0, 1, 1, 0,
|
||||
1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1,
|
||||
0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0,
|
||||
0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0,
|
||||
0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0,
|
||||
},
|
||||
{ // 7
|
||||
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
||||
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
||||
1, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 1, 1, 1, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 1, 1, 1, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 1, 1, 1, 0, 0, 0, 0, 0, 0,
|
||||
},
|
||||
{ // 8
|
||||
0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0,
|
||||
0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0,
|
||||
0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1,
|
||||
0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
0, 1, 1, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
0, 0, 1, 1, 0, 0, 0, 0, 1, 1, 0,
|
||||
0, 0, 1, 1, 1, 1, 1, 1, 1, 0, 0,
|
||||
0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 0,
|
||||
0, 0, 1, 1, 1, 0, 1, 1, 1, 0, 0,
|
||||
0, 1, 1, 1, 0, 0, 0, 1, 1, 1, 0,
|
||||
1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0,
|
||||
0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0,
|
||||
},
|
||||
{ // 9
|
||||
0, 0, 0, 1, 1, 1, 1, 1, 0, 0, 0,
|
||||
0, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0,
|
||||
0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 0,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
1, 1, 0, 0, 0, 0, 0, 0, 1, 1, 1,
|
||||
0, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1,
|
||||
0, 1, 1, 1, 1, 1, 1, 1, 0, 1, 1,
|
||||
0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 1,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0,
|
||||
0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0,
|
||||
0, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0,
|
||||
0, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0,
|
||||
},
|
||||
}
|
||||
271
vendor/github.com/dchest/captcha/image.go
generated
vendored
Normal file
271
vendor/github.com/dchest/captcha/image.go
generated
vendored
Normal file
@ -0,0 +1,271 @@
|
||||
// Copyright 2011-2014 Dmitry Chestnykh. All rights reserved.
|
||||
// Use of this source code is governed by a MIT-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package captcha
|
||||
|
||||
import (
|
||||
"bytes"
|
||||
"image"
|
||||
"image/color"
|
||||
"image/png"
|
||||
"io"
|
||||
"math"
|
||||
)
|
||||
|
||||
const (
|
||||
// Standard width and height of a captcha image.
|
||||
StdWidth = 240
|
||||
StdHeight = 80
|
||||
// Maximum absolute skew factor of a single digit.
|
||||
maxSkew = 0.7
|
||||
// Number of background circles.
|
||||
circleCount = 20
|
||||
)
|
||||
|
||||
type Image struct {
|
||||
*image.Paletted
|
||||
numWidth int
|
||||
numHeight int
|
||||
dotSize int
|
||||
rng siprng
|
||||
}
|
||||
|
||||
// NewImage returns a new captcha image of the given width and height with the
|
||||
// given digits, where each digit must be in range 0-9.
|
||||
func NewImage(id string, digits []byte, width, height int) *Image {
|
||||
m := new(Image)
|
||||
|
||||
// Initialize PRNG.
|
||||
m.rng.Seed(deriveSeed(imageSeedPurpose, id, digits))
|
||||
|
||||
m.Paletted = image.NewPaletted(image.Rect(0, 0, width, height), m.getRandomPalette())
|
||||
m.calculateSizes(width, height, len(digits))
|
||||
// Randomly position captcha inside the image.
|
||||
maxx := width - (m.numWidth+m.dotSize)*len(digits) - m.dotSize
|
||||
maxy := height - m.numHeight - m.dotSize*2
|
||||
var border int
|
||||
if width > height {
|
||||
border = height / 5
|
||||
} else {
|
||||
border = width / 5
|
||||
}
|
||||
x := m.rng.Int(border, maxx-border)
|
||||
y := m.rng.Int(border, maxy-border)
|
||||
// Draw digits.
|
||||
for _, n := range digits {
|
||||
m.drawDigit(font[n], x, y)
|
||||
x += m.numWidth + m.dotSize
|
||||
}
|
||||
// Draw strike-through line.
|
||||
m.strikeThrough()
|
||||
// Apply wave distortion.
|
||||
m.distort(m.rng.Float(5, 10), m.rng.Float(100, 200))
|
||||
// Fill image with random circles.
|
||||
m.fillWithCircles(circleCount, m.dotSize)
|
||||
return m
|
||||
}
|
||||
|
||||
func (m *Image) getRandomPalette() color.Palette {
|
||||
p := make([]color.Color, circleCount+1)
|
||||
// Transparent color.
|
||||
p[0] = color.RGBA{0xFF, 0xFF, 0xFF, 0x00}
|
||||
// Primary color.
|
||||
prim := color.RGBA{
|
||||
uint8(m.rng.Intn(129)),
|
||||
uint8(m.rng.Intn(129)),
|
||||
uint8(m.rng.Intn(129)),
|
||||
0xFF,
|
||||
}
|
||||
p[1] = prim
|
||||
// Circle colors.
|
||||
for i := 2; i <= circleCount; i++ {
|
||||
p[i] = m.randomBrightness(prim, 255)
|
||||
}
|
||||
return p
|
||||
}
|
||||
|
||||
// encodedPNG encodes an image to PNG and returns
|
||||
// the result as a byte slice.
|
||||
func (m *Image) encodedPNG() []byte {
|
||||
var buf bytes.Buffer
|
||||
if err := png.Encode(&buf, m.Paletted); err != nil {
|
||||
panic(err.Error())
|
||||
}
|
||||
return buf.Bytes()
|
||||
}
|
||||
|
||||
// WriteTo writes captcha image in PNG format into the given writer.
|
||||
func (m *Image) WriteTo(w io.Writer) (int64, error) {
|
||||
n, err := w.Write(m.encodedPNG())
|
||||
return int64(n), err
|
||||
}
|
||||
|
||||
func (m *Image) calculateSizes(width, height, ncount int) {
|
||||
// Goal: fit all digits inside the image.
|
||||
var border int
|
||||
if width > height {
|
||||
border = height / 4
|
||||
} else {
|
||||
border = width / 4
|
||||
}
|
||||
// Convert everything to floats for calculations.
|
||||
w := float64(width - border*2)
|
||||
h := float64(height - border*2)
|
||||
// fw takes into account 1-dot spacing between digits.
|
||||
fw := float64(fontWidth + 1)
|
||||
fh := float64(fontHeight)
|
||||
nc := float64(ncount)
|
||||
// Calculate the width of a single digit taking into account only the
|
||||
// width of the image.
|
||||
nw := w / nc
|
||||
// Calculate the height of a digit from this width.
|
||||
nh := nw * fh / fw
|
||||
// Digit too high?
|
||||
if nh > h {
|
||||
// Fit digits based on height.
|
||||
nh = h
|
||||
nw = fw / fh * nh
|
||||
}
|
||||
// Calculate dot size.
|
||||
m.dotSize = int(nh / fh)
|
||||
if m.dotSize < 1 {
|
||||
m.dotSize = 1
|
||||
}
|
||||
// Save everything, making the actual width smaller by 1 dot to account
|
||||
// for spacing between digits.
|
||||
m.numWidth = int(nw) - m.dotSize
|
||||
m.numHeight = int(nh)
|
||||
}
|
||||
|
||||
func (m *Image) drawHorizLine(fromX, toX, y int, colorIdx uint8) {
|
||||
for x := fromX; x <= toX; x++ {
|
||||
m.SetColorIndex(x, y, colorIdx)
|
||||
}
|
||||
}
|
||||
|
||||
func (m *Image) drawCircle(x, y, radius int, colorIdx uint8) {
|
||||
f := 1 - radius
|
||||
dfx := 1
|
||||
dfy := -2 * radius
|
||||
xo := 0
|
||||
yo := radius
|
||||
|
||||
m.SetColorIndex(x, y+radius, colorIdx)
|
||||
m.SetColorIndex(x, y-radius, colorIdx)
|
||||
m.drawHorizLine(x-radius, x+radius, y, colorIdx)
|
||||
|
||||
for xo < yo {
|
||||
if f >= 0 {
|
||||
yo--
|
||||
dfy += 2
|
||||
f += dfy
|
||||
}
|
||||
xo++
|
||||
dfx += 2
|
||||
f += dfx
|
||||
m.drawHorizLine(x-xo, x+xo, y+yo, colorIdx)
|
||||
m.drawHorizLine(x-xo, x+xo, y-yo, colorIdx)
|
||||
m.drawHorizLine(x-yo, x+yo, y+xo, colorIdx)
|
||||
m.drawHorizLine(x-yo, x+yo, y-xo, colorIdx)
|
||||
}
|
||||
}
|
||||
|
||||
func (m *Image) fillWithCircles(n, maxradius int) {
|
||||
maxx := m.Bounds().Max.X
|
||||
maxy := m.Bounds().Max.Y
|
||||
for i := 0; i < n; i++ {
|
||||
colorIdx := uint8(m.rng.Int(1, circleCount-1))
|
||||
r := m.rng.Int(1, maxradius)
|
||||
m.drawCircle(m.rng.Int(r, maxx-r), m.rng.Int(r, maxy-r), r, colorIdx)
|
||||
}
|
||||
}
|
||||
|
||||
func (m *Image) strikeThrough() {
|
||||
maxx := m.Bounds().Max.X
|
||||
maxy := m.Bounds().Max.Y
|
||||
y := m.rng.Int(maxy/3, maxy-maxy/3)
|
||||
amplitude := m.rng.Float(5, 20)
|
||||
period := m.rng.Float(80, 180)
|
||||
dx := 2.0 * math.Pi / period
|
||||
for x := 0; x < | ||||