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:
Stanislav Nikitin 2018-05-01 17:45:36 +05:00
parent 6150e3c1fd
commit 850fbb55ab
25 changed files with 11611 additions and 14 deletions

8
Gopkg.lock generated
View File

@ -44,6 +44,12 @@
packages = ["."]
revision = "cbb64ac3d964b81592e64f957ad53df015803288"
[[projects]]
branch = "master"
name = "github.com/dchest/captcha"
packages = ["."]
revision = "6a29415a8364ec2971fdc62d9e415ed53fc20410"
[[projects]]
name = "github.com/dgrijalva/jwt-go"
packages = ["."]
@ -174,6 +180,6 @@
[solve-meta]
analyzer-name = "dep"
analyzer-version = 1
inputs-digest = "0e162c63d4eebc3e71a0d1ebba784963b8aa60886a706e396bc9d35d7d12802f"
inputs-digest = "2633c4577a85d689bec7db65efe6c7f4da249d49bad8bee68df1eb0ab037bdef"
solver-name = "gps-cdcl"
solver-version = 1

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@ -22,7 +22,7 @@ whistles, no websockets and even NO JAVASCRIPT!(*)
Just issue:
```
go get -u -v github.com/pztrn/fastpastebin
go get -u -v github.com/pztrn/fastpastebin/cmd/fastpastebin
```
This command can be used to update Fast Paste Bin.

View File

@ -31,6 +31,7 @@ import (
// local
"github.com/pztrn/fastpastebin/api/http/static"
"github.com/pztrn/fastpastebin/captcha"
// other
"github.com/alecthomas/chroma/lexers"
@ -54,5 +55,9 @@ func indexGet(ec echo.Context) error {
html := strings.Replace(string(htmlRaw), "{lexers}", availableLexersSelectOpts, 1)
// Captcha.
captchaString := captcha.NewCaptcha()
html = strings.Replace(html, "{captchaString}", captchaString, -1)
return ec.HTML(http.StatusOK, html)
}

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@ -1,5 +1,5 @@
// 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.
// modification hash(173f89ae699d558787ec5f8317fe49c2.5c3b355fe5a9e5324e826569a62de332)
// 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.
// modification hash(6b14c8cdfc1bdcdaa0abe70393080151.5c3b355fe5a9e5324e826569a62de332)
package static

File diff suppressed because one or more lines are too long

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@ -1,5 +1,5 @@
// 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.
// modified(2018-05-01 14:28:26.665088437 +0500 +05)
// 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.
// modified(2018-05-01 17:43:05.438136251 +0500 +05)
// original path: assets/paste.html
package static
@ -10,7 +10,7 @@ import (
)
// FilePasteHTML is "/paste.html"
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func init() {

View File

@ -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() {

View File

@ -1,3 +1,9 @@
#paste-contents {
font-family: monospace;
font-size: 0.9rem;
height: 90vh;
}
.paste-data {
font-size: 0.9rem;
}

View File

@ -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!">

View File

@ -32,7 +32,7 @@
</div>
</div>
</nav>
<section class="section">
<section class="section paste-data">
{pastedata}
</section>
</body>

59
captcha/exported.go Normal file
View 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)
}

View File

@ -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.

View File

@ -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
View 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
View 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
View 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
--------
![Image](https://github.com/dchest/captcha/raw/master/capgen/example.png)
[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
View 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
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@ -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)
}

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// 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
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// 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 <