Removed code for a standalone executable. go min ver was downgraded to 1.12.

Makefile

@@ -1,33 +0,0 @@
-PACKAGE_NAME=justcaptcha
-TARGET=${PACKAGE_NAME}d
-
-SYSCTL=${shell which systemctl}
-SYSDDIR_=${shell pkg-config systemd --variable=systemdsystemunitdir}
-SYSDDIR=${SYSDDIR_:/%=%}
-DESTDIR=/
-
-VERSION=2.0.2
-
-LDFLAGS=-ldflags "-s -w -X main.version=${VERSION}" -tags osusergo,netgo
-
-all: ${TARGET}
-
-.PHONY: ${TARGET}
-
-${TARGET}:
-	go build -o bin/$@ ${LDFLAGS} cmd/$@/main.go
-
-run:
-	bin/${TARGET} -expiry 1m -listen 127.0.0.1:19134
-
-install:
-	install -Dm 0755 bin/${TARGET} ${DESTDIR}usr/bin/${TARGET}
-	install -Dm 0644 LICENSE ${DESTDIR}usr/share/licenses/${PACKAGE_NAME}/LICENSE
-
-	install -Dm 0644 init/systemd.service ${DESTDIR}${SYSDDIR}/${PACKAGE_NAME}.service
-
-uninstall:
-	rm ${DESTDIR}usr/bin/${TARGET}
-	rm ${DESTDIR}usr/share/licenses/${PACKAGE_NAME}/LICENSE
-
-	rm ${DESTDIR}${SYSDDIR}/${PACKAGE_NAME}.service

README.md

@@ -1,105 +1,9 @@
 justcaptcha
 ===========
 
-A simple CAPTCHA service implementation.
+A simple CAPTCHA implementation.
 
-## Service usage
+An example using built-in "dwelling" implementation.
-
-    justcaptchad -expiry 10m -listen /var/run/justcaptcha/sock
-
-`-expiry` takes time for CAPTCHA to be valid for in format X{s,m,h}.
-
-`-listen` is `ip:port` or `/path/to/unix.sock` to listen on.
-
-## Service HTTP API
-
-### Errors
-
-All error codes are returned with an error message in `text/plain`.
-
-### Create a new CAPTCHA
-
-    POST /
-
-It will return an ID of a new CAPTCHA in `text/plain`.
-
-#### HTTP codes
-- `201` if created (always being created)
-
-### Get an image for a CAPTCHA
-
-    GET /:captcha_id/image?style=
-
-Responds with an image in JPEG format (`image/jpeg`).
-
-An optional URL parameter `style=` set a name of a CAPTCHA style if it is
-supported by CAPTCHA implementation. E.g. `style=dark`.
-
-#### HTTP codes
-- `200` if exists
-- `404` if doesn't exist
-- `500` if for some reason an image wasn't created
-
-### Submit an answer
-
-    POST /:captcha_id
-
-Accepts `application/x-www-form-urlencoded` content type.
-
-It takes one parameter `answer=123456`.
-
-Responds with an empty body and one of the HTTP codes.
-
-#### HTTP codes
-- `202` if solved
-- `403` if not solved
-
-### Check if captcha is solved
-
-    GET /:captcha_id?remove
-
-Responds with an empty body and one of the HTTP codes.
-
-If an optional `remove` parameter without a value supplied CAPTCHA will be
-removed without checking and a HTTP code `204` will be sent. Otherwise, a `403`
-HTTP code will be sent if it is not solved.
-
-A `remove` parameter was added because browsers will print an error in a console
-if HTTP code is not within `2xx`, so to keep a console clean you can provide
-this parameter.
-
-This can be useful to remove an unused CAPTCHA from a DB without waiting for it
-to be expired. E.g. when a visitor requests for a new CAPTCHA or leaving a page.
-
-#### HTTP codes
-- `204` if solved
-- `403` if not solved
-
-### Example of interaction
-
-First a client makes a POST request with empty body to create a new CAPTCHA and obtains an ID for it.
-
-    POST /
-
-As a result we get an ID `n60f2K9JiD5c4qX9MYe90A54nT0nnJrtgfhAjfaWtBg`.
-
-Then a client requests an image for a new CAPTCHA. E.g. with a dark style.
-
-    GET /n60f2K9JiD5c4qX9MYe90A54nT0nnJrtgfhAjfaWtBg/image?style=dark
-
-Then a client submits an answer for a CAPTCHA.
-
-    POST 'answer=198807' /n60f2K9JiD5c4qX9MYe90A54nT0nnJrtgfhAjfaWtBg
-
-And if answer was correct a client gets a HTTP code 202. Or 403 otherwise.
-
-Then a server checks if CAPTCHA was solved with following request.
-
-    GET /n60f2K9JiD5c4qX9MYe90A54nT0nnJrtgfhAjfaWtBg
-
-## Library usage
-
-A simple example using built-in dwelling CAPTCHA implementation.
 
 Create a new CAPTCHA:
 

build/archlinux/PKGBUILD

@@ -1,23 +0,0 @@
-# Maintainer: Alexander "Arav" Andreev <me@arav.su>
-pkgname=justcaptcha
-pkgver=2.0.2
-pkgrel=2
-pkgdesc="Just a standalone simple CAPTCHA service"
-arch=('i686' 'x86_64' 'arm' 'armv6h' 'armv7h' 'aarch64')
-url="https://git.arav.su/Arav/justcaptcha"
-license=('MIT')
-makedepends=('go')
-provides=('justcaptcha')
-conflicts=('justcaptcha')
-source=("https://git.arav.su/Arav/justcaptcha/archive/v${pkgver}.tar.gz")
-md5sums=('SKIP')
-
-build() {
-    cd "$srcdir/$pkgname"
-    make VERSION=$pkgver DESTDIR="$pkgdir/"
-}
-
-package() {
-    cd "$srcdir/$pkgname"
-    make VERSION=$pkgver DESTDIR="$pkgdir/" install
-}

cmd/justcaptchad/main.go

@@ -1,69 +0,0 @@
-package main
-
-import (
-	"flag"
-	"fmt"
-	"log"
-	"net/netip"
-	"os"
-	"os/signal"
-	"strings"
-	"syscall"
-	"time"
-
-	"git.arav.su/Arav/justcaptcha/internal/http"
-)
-
-var version string
-
-var listenAddress *string = flag.String("listen", "/var/run/justcaptcha/sock", "listen address (ip:port|unix_path)")
-var captchaExpiry *time.Duration = flag.Duration("expiry", 10*time.Minute, "CAPTCHA expiry in format XX{s,m,h}, e.g. 5m, 300s")
-var showVersion *bool = flag.Bool("v", false, "show version")
-
-func main() {
-	flag.Parse()
-	log.SetFlags(0)
-
-	if *showVersion {
-		fmt.Println("justcaptchad ver.", version, "\nCopyright (c) 2022 Alexander \"Arav\" Andreev <me@arav.su>")
-		return
-	}
-
-	hand := http.NewCaptchaHandlers(*captchaExpiry)
-	srv := http.NewHttpServer()
-
-	srv.POST("/", hand.New)
-	srv.POST("/:captcha", hand.Solve)
-	srv.GET("/:captcha", hand.IsSolved)
-	srv.GET("/:captcha/image", hand.Image)
-
-	var network string
-	if !strings.ContainsRune(*listenAddress, ':') {
-		network = "unix"
-		defer os.Remove(*listenAddress)
-	} else {
-		ap, err := netip.ParseAddrPort(*listenAddress)
-		if err != nil {
-			log.Fatalln(err)
-		}
-
-		if ap.Addr().Is4() {
-			network = "tcp4"
-		} else if ap.Addr().Is6() {
-			network = "tcp6"
-		}
-	}
-
-	if err := srv.Start(network, *listenAddress); err != nil {
-		log.Fatalln("failed to start a server:", err)
-	}
-
-	doneSignal := make(chan os.Signal, 1)
-	signal.Notify(doneSignal, os.Interrupt, syscall.SIGINT, syscall.SIGTERM)
-
-	<-doneSignal
-
-	if err := srv.Stop(); err != nil {
-		log.Fatalln("failed to properly shutdown a server:", err)
-	}
-}

go.mod

@@ -1,11 +1,8 @@
 module git.arav.su/Arav/justcaptcha
 
-go 1.19
+go 1.12
 
-require (
+require github.com/fogleman/gg v1.3.0
-	github.com/fogleman/gg v1.3.0
-	github.com/julienschmidt/httprouter v1.3.0
-)
 
 require (
 	github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 // indirect

go.sum

@@ -2,8 +2,6 @@ github.com/fogleman/gg v1.3.0 h1:/7zJX8F6AaYQc57WQCyN9cAIz+4bCJGO9B+dyW29am8=
 github.com/fogleman/gg v1.3.0/go.mod h1:R/bRT+9gY/C5z7JzPU0zXsXHKM4/ayA+zqcVNZzPa1k=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
-github.com/julienschmidt/httprouter v1.3.0 h1:U0609e9tgbseu3rBINet9P48AI/D3oJs4dN7jwJOQ1U=
-github.com/julienschmidt/httprouter v1.3.0/go.mod h1:JR6WtHb+2LUe8TCKY3cZOxFyyO8IZAc4RVcycCCAKdM=
 github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=

init/systemd.service

@@ -1,39 +0,0 @@
-[Unit]
-Description=A simple CAPTCHA service for your website
-After=network.target
-
-[Service]
-Type=simple
-Restart=on-failure
-DynamicUser=yes
-ExecStart=/usr/bin/justcaptchad -expiry 10m -listen /var/run/justcaptcha/sock
-
-ReadOnlyPaths=/
-# Set here path to directory where uploads are stored.
-NoExecPaths=/
-ExecPaths=/usr/bin/justcaptchad
-
-RuntimeDirectory=justcaptcha
-
-AmbientCapabilities=
-CapabilityBoundingSet=
-
-LockPersonality=true
-MemoryDenyWriteExecute=true
-NoNewPrivileges=true
-PrivateDevices=true
-ProtectClock=true
-ProtectControlGroups=true
-ProtectHome=true
-ProtectKernelLogs=true
-ProtectKernelModules=true
-ProtectKernelTunables=true
-ProtectSystem=strict
-RestrictAddressFamilies=AF_INET AF_INET6 AF_UNIX
-RestrictNamespaces=true
-RestrictRealtime=true
-RestrictSUIDSGID=true
-SystemCallArchitectures=native
-
-[Install]
-WantedBy=multi-user.target

internal/http/handlers.go

@@ -1,78 +0,0 @@
-package http
-
-import (
-	"fmt"
-	"image/jpeg"
-	"net/http"
-	"time"
-
-	"git.arav.su/Arav/justcaptcha/pkg/captcha"
-	"git.arav.su/Arav/justcaptcha/pkg/captcha/inmemdb"
-	"git.arav.su/Arav/justcaptcha/pkg/dwcaptcha"
-)
-
-const errMsgWrongAnswer = "An answer provided was wrong"
-const errMsgImageNotFound = "cannot get an image for a non-existing CAPTCHA"
-
-type CaptchaHandlers struct {
-	expiry time.Duration
-}
-
-func NewCaptchaHandlers(expiry time.Duration) *CaptchaHandlers {
-	inmemdb.SetExpiry(expiry)
-	return &CaptchaHandlers{expiry: expiry}
-}
-
-func (h *CaptchaHandlers) New(w http.ResponseWriter, r *http.Request) {
-	dc := dwcaptcha.NewDwellingCaptcha(h.expiry)
-	_, id := inmemdb.New(r.RemoteAddr, dc)
-	w.WriteHeader(http.StatusCreated)
-	fmt.Fprint(w, id)
-}
-
-func (h *CaptchaHandlers) Image(w http.ResponseWriter, r *http.Request) {
-	captchaID := captcha.ID(getURLParam(r, "captcha"))
-	captchaStyle := r.URL.Query().Get("style")
-
-	captchaImage := inmemdb.Image(captchaID, captchaStyle)
-	if captchaImage == nil {
-		http.Error(w, errMsgImageNotFound, http.StatusNotFound)
-		return
-	}
-
-	w.Header().Add("Content-Disposition", "inline; filename=\""+string(captchaID)+"\"")
-
-	jpeg.Encode(w, *captchaImage, &jpeg.Options{Quality: 20})
-}
-
-func (h *CaptchaHandlers) Solve(w http.ResponseWriter, r *http.Request) {
-	captchaID := captcha.ID(getURLParam(r, "captcha"))
-
-	r.ParseForm()
-	answer := captcha.Answer(r.FormValue("answer"))
-
-	if ok := inmemdb.Solve(captchaID, answer); !ok {
-		http.Error(w, errMsgWrongAnswer, http.StatusForbidden)
-		return
-	}
-
-	w.WriteHeader(http.StatusAccepted)
-}
-
-func (h *CaptchaHandlers) IsSolved(w http.ResponseWriter, r *http.Request) {
-	captchaID := captcha.ID(getURLParam(r, "captcha"))
-	isJustRemove := r.URL.Query().Has("remove")
-
-	if isJustRemove {
-		inmemdb.Remove(captchaID)
-		w.WriteHeader(http.StatusNoContent)
-		return
-	}
-
-	if solved := inmemdb.IsSolved(captchaID); !solved {
-		http.Error(w, errMsgWrongAnswer, http.StatusForbidden)
-		return
-	}
-
-	w.WriteHeader(http.StatusNoContent)
-}

internal/http/server.go

@@ -1,76 +0,0 @@
-package http
-
-import (
-	"context"
-	"log"
-	"net"
-	"net/http"
-	"os"
-	"time"
-
-	"github.com/julienschmidt/httprouter"
-)
-
-type HttpServer struct {
-	server *http.Server
-	router *httprouter.Router
-}
-
-func NewHttpServer() *HttpServer {
-	r := httprouter.New()
-	return &HttpServer{
-		server: &http.Server{
-			ReadTimeout:  3 * time.Second,
-			WriteTimeout: 3 * time.Second,
-			Handler:      r,
-		},
-		router: r,
-	}
-}
-
-func (s *HttpServer) GET(path string, handler http.HandlerFunc) {
-	s.router.Handler(http.MethodGet, path, handler)
-}
-
-func (s *HttpServer) POST(path string, handler http.HandlerFunc) {
-	s.router.Handler(http.MethodPost, path, handler)
-}
-
-func (s *HttpServer) SetNotFoundHandler(handler http.HandlerFunc) {
-	s.router.NotFound = handler
-}
-
-// getURLParam wrapper around underlying router for getting URL parameters.
-func getURLParam(r *http.Request, param string) string {
-	return httprouter.ParamsFromContext(r.Context()).ByName(param)
-}
-
-func (s *HttpServer) Start(network, address string) error {
-	listener, err := net.Listen(network, address)
-	if err != nil {
-		return err
-	}
-
-	if listener.Addr().Network() == "unix" {
-		os.Chmod(address, 0777)
-	}
-
-	go func() {
-		if err = s.server.Serve(listener); err != nil && err != http.ErrServerClosed {
-			log.Fatalln(err)
-		}
-	}()
-
-	return nil
-}
-
-func (s *HttpServer) Stop() error {
-	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
-	defer cancel()
-
-	if err := s.server.Shutdown(ctx); err != nil {
-		return err
-	}
-
-	return nil
-}