Functions — github.com/dchest/captcha

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Functions74 in github.com/dchest/captcha

⨍ Functions 74 ◇ Types & classes 7

↓ 11 callersFunctionRandomDigits

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.

↓ 10 callersMethodGet

Get returns stored digits for the captcha id. Clear indicates whether the captcha must be deleted from the store.

↓ 8 callersMethodSet

Set sets the digits for the captcha id.

↓ 6 callersFunctionrndf

rndf returns a non-crypto pseudorandom float64 in range [from, to].

↓ 5 callersFunctionNewMemoryStore

NewMemoryStore returns a new standard memory store for captchas with the given collection threshold and expiration time (duration). The returned store

↓ 5 callersFunctionrnd

rnd returns a non-crypto pseudorandom int in range [from, to].

↓ 4 callersFunctionNewAudio

NewImage 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 the

↓ 4 callersMethodWriteTo

BUG(dchest): While Image conforms to io.WriterTo interface, its WriteTo method returns 0 instead of the actual bytes written because png.Encode doesn'

↓ 3 callersFunctionNew

New creates a new captcha with the standard length, saves it in the internal storage and returns its id.

↓ 3 callersFunctionNewImage

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.

↓ 3 callersFunctionchangeSpeed

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].

↓ 3 callersMethodcollect

↓ 3 callersMethoddrawCircle

(x, y, radius int, colorIdx uint8)

↓ 3 callersFunctionrandomId

randomId returns a new random id string.

↓ 2 callersFunctionReload

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 call

↓ 2 callersFunctionVerify

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 i

↓ 2 callersMethodWrite

image_test.go:13

↓ 2 callersMethodWriteTo

WriteTo writes captcha audio in WAVE format into the given io.Writer, and returns the number of bytes written and an error if any.

↓ 2 callersFunctionmixSound

mixSound mixes src into dst. Dst must have length equal to or greater than src length.

↓ 2 callersFunctionrandomBytes

randomBytes returns a byte slice of the given length read from CSPRNG.

↓ 2 callersFunctionrandomBytesMod

randomBytesMod returns a byte slice of the given length, where each byte is a random number modulo mod.

↓ 2 callersFunctionsetSoundLevel

(a []byte, level float64)

↓ 2 callersFunctionwriteFileRep

(pcm io.Writer, name, prefix string)

capgensounds/main.go:45

↓ 1 callersMethodEncodedLen

EncodedLen returns the length of WAV-encoded audio captcha.

↓ 1 callersFunctionNewLen

NewLen is just like New, but accepts length of a captcha solution as the argument.

↓ 1 callersFunctionWriteImage

WriteImage writes PNG-encoded image representation of the captcha with the given id. The image will have the given width and height.

↓ 1 callersMethodcalculateSizes

(width, height, ncount int)

↓ 1 callersMethoddistort

(amplude float64, period float64)

↓ 1 callersMethoddrawDigit

(digit []byte, x, y int)

↓ 1 callersMethoddrawHorizLine

(fromX, toX, y int, colorIdx uint8)

↓ 1 callersMethodfillWithCircles

(n, maxradius int)

↓ 1 callersMethodlongestDigitSndLen

↓ 1 callersMethodmakeBackgroundSound

↓ 1 callersFunctionmakeSilence

↓ 1 callersFunctionmakeWhiteNoise

(length int, level uint8)

↓ 1 callersFunctionmax3

(x, y, z uint8)

↓ 1 callersFunctionmin3

(x, y, z uint8)

↓ 1 callersFunctionrandomBrightness

(c color.RGBA, max uint8)

↓ 1 callersFunctionrandomPalette

↓ 1 callersFunctionrandomSpeed

↓ 1 callersMethodrandomizedDigitSound

↓ 1 callersFunctionreversedSound

↓ 1 callersMethodserve

(w http.ResponseWriter, id, ext string, lang string, download bool)

↓ 1 callersMethodstrikeThrough

↓ 1 callersFunctionusage

capgen/main.go:26

↓ 1 callersFunctionwriteDigitSounds

(pcm io.Writer, lang string)

capgensounds/main.go:59

↓ 1 callersFunctionwriteSingle

(pcm io.Writer, name string)

capgensounds/main.go:53

↓ 1 callersFunctionwriteVar

(w io.Writer, b []byte, prefix string)

capgensounds/main.go:23

FunctionBenchmarkAudioWriteTo

audio_test.go:21

FunctionBenchmarkImageWriteTo

image_test.go:27

FunctionBenchmarkNewAudio

audio_test.go:12

FunctionBenchmarkNewImage

image_test.go:18

FunctionBenchmarkSetCollect

store_test.go:65

(id string, clear bool)

MethodServeHTTP

(w http.ResponseWriter, r *http.Request)

Server returns a handler that serves HTTP requests with image or audio representations of captchas. Image dimensions are accepted as arguments. The se

(id string, digits []byte)

FunctionSetCustomStore

SetCustomStore sets custom storage for captchas, replacing the default memory store. This function must be called before generating any captchas.

FunctionTestCollect

store_test.go:38

FunctionTestGetClear

store_test.go:23

FunctionTestNew

captcha_test.go:12

FunctionTestRandomDigits

captcha_test.go:41

FunctionTestReload

captcha_test.go:31

FunctionTestSetGet

store_test.go:12

FunctionTestVerify

captcha_test.go:19

FunctionVerifyString

VerifyString is like Verify, but accepts a string of digits. It removes spaces and commas from the string, but any other characters, apart from digit

FunctionWriteAudio

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 langu

capexample/main.go:44

capgensounds/main.go:69

capgen/main.go:31

FunctionprocessFormHandler

(w http.ResponseWriter, r *http.Request)

capexample/main.go:34

FunctionshowFormHandler

(w http.ResponseWriter, r *http.Request)

capexample/main.go:19