Migrate to checker-sdk-go v1.3.0 with standalone build tag

The SDK split the HTTP server scaffolding into the new
checker-sdk-go/checker/server subpackage and renamed
CheckerInteractive to server.Interactive. Update main.go to import
server and call server.New, switch the compile-time assertion to
server.Interactive, and isolate the interactive form code behind the
standalone build tag so plugin/builtin builds skip net/http entirely.

Dockerfile

@@ -6,7 +6,7 @@ WORKDIR /src
 COPY go.mod go.sum ./
 RUN go mod download
 COPY . .
-RUN CGO_ENABLED=0 go build -ldflags "-X main.Version=${CHECKER_VERSION}" -o /checker-email-keys .
+RUN CGO_ENABLED=0 go build -tags standalone -ldflags "-X main.Version=${CHECKER_VERSION}" -o /checker-email-keys .
 
 FROM scratch
 COPY --from=builder /checker-email-keys /checker-email-keys

Makefile

@@ -6,12 +6,12 @@ CHECKER_SOURCES := main.go $(wildcard checker/*.go)
 
 GO_LDFLAGS := -X main.Version=$(CHECKER_VERSION)
 
-.PHONY: all plugin docker clean
+.PHONY: all plugin docker test clean
 
 all: $(CHECKER_NAME)
 
 $(CHECKER_NAME): $(CHECKER_SOURCES)
-	go build -ldflags "$(GO_LDFLAGS)" -o $@ .
+	go build -tags standalone -ldflags "$(GO_LDFLAGS)" -o $@ .
 
 plugin: $(CHECKER_NAME).so
 
@@ -21,5 +21,8 @@ $(CHECKER_NAME).so: $(CHECKER_SOURCES) $(wildcard plugin/*.go)
 docker:
 	docker build --build-arg CHECKER_VERSION=$(CHECKER_VERSION) -t $(CHECKER_IMAGE) .
 
+test:
+	go test -tags standalone ./...
+
 clean:
 	rm -f $(CHECKER_NAME) $(CHECKER_NAME).so

checker/definition.go

@@ -19,7 +19,7 @@ const (
 )
 
 // Definition is the package-level helper returned to the host by the
-// plugin entrypoint and used by sdk.NewServer via the provider's
+// plugin entrypoint and used by server.New via the provider's
 // CheckerDefinitionProvider implementation.
 func Definition() *sdk.CheckerDefinition {
 	return &sdk.CheckerDefinition{

checker/interactive.go

@@ -1,3 +1,5 @@
+//go:build standalone
+
 package checker
 
 import (
@@ -5,14 +7,16 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http"
+	"strconv"
 	"strings"
 
 	"github.com/miekg/dns"
 
 	sdk "git.happydns.org/checker-sdk-go/checker"
+	"git.happydns.org/checker-sdk-go/checker/server"
 )
 
-// RenderForm implements sdk.CheckerInteractive. It exposes the minimal
+// RenderForm implements server.Interactive. It exposes the minimal
 // inputs needed to bootstrap a standalone OPENPGPKEY/SMIMEA check: an
 // email address (the local part is hashed into the owner name) and a
 // kind selector. The DNS resolver and severity-tuning options mirror
@@ -63,7 +67,7 @@ func (p *emailKeyProvider) RenderForm() []sdk.CheckerOptionField {
 	}
 }
 
-// ParseForm implements sdk.CheckerInteractive. It validates the inputs,
+// ParseForm implements server.Interactive. It validates the inputs,
 // resolves the DNS record matching the requested kind, and returns the
 // CheckerOptions that Collect expects, including a synthesised service
 // envelope built from the live DNS answer.
@@ -102,7 +106,7 @@ func (p *emailKeyProvider) ParseForm(r *http.Request) (sdk.CheckerOptions, error
 	}
 
 	resolverOpt := strings.TrimSpace(r.FormValue(OptionResolver))
-	owner := dns.Fqdn(ownerHashHex(username) + "." + strings.TrimPrefix(prefix, ".") + "." + domain)
+	owner := dns.Fqdn(ownerHashHex(username) + "." + prefix + "." + domain)
 
 	ctx, cancel := context.WithTimeout(r.Context(), dnsTimeout*3)
 	defer cancel()
@@ -160,12 +164,12 @@ func (p *emailKeyProvider) ParseForm(r *http.Request) (sdk.CheckerOptions, error
 
 // parseFloatOr parses a decimal string, returning fallback on error.
 func parseFloatOr(s string, fallback float64) float64 {
-	var f float64
+	f, err := strconv.ParseFloat(s, 64)
-	if _, err := fmt.Sscanf(s, "%f", &f); err != nil {
+	if err != nil {
 		return fallback
 	}
 	return f
 }
 
 // Compile-time assertion that the provider implements the optional interface.
-var _ sdk.CheckerInteractive = (*emailKeyProvider)(nil)
+var _ server.Interactive = (*emailKeyProvider)(nil)

go.mod

@@ -3,7 +3,7 @@ module git.happydns.org/checker-email-keys
 go 1.25.0
 
 require (
-	git.happydns.org/checker-sdk-go v1.1.0
+	git.happydns.org/checker-sdk-go v1.3.0
 	github.com/ProtonMail/go-crypto v1.1.0-alpha.0
 	github.com/miekg/dns v1.1.72
 )

go.sum

@@ -1,5 +1,5 @@
-git.happydns.org/checker-sdk-go v1.1.0 h1:xgR39X1Mh+v481BHTDYHtGYFL1qRwldTsehazwSc67Y=
+git.happydns.org/checker-sdk-go v1.3.0 h1:FG2kIhlJCzI0m35EhxSgn4UWc9M4ha6aZTeoChu4l7A=
-git.happydns.org/checker-sdk-go v1.1.0/go.mod h1:aNAcfYFfbhvH9kJhE0Njp5GX0dQbxdRB0rJ0KvSC5nI=
+git.happydns.org/checker-sdk-go v1.3.0/go.mod h1:aNAcfYFfbhvH9kJhE0Njp5GX0dQbxdRB0rJ0KvSC5nI=
 github.com/ProtonMail/go-crypto v1.1.0-alpha.0 h1:nHGfwXmFvJrSR9xu8qL7BkO4DqTHXE9N5vPhgY2I+j0=
 github.com/ProtonMail/go-crypto v1.1.0-alpha.0/go.mod h1:rA3QumHc/FZ8pAHreoekgiAbzpNsfQAosU5td4SnOrE=
 github.com/cloudflare/circl v1.3.7 h1:qlCDlTPz2n9fu58M0Nh1J/JzcFpfgkFHHX3O35r5vcU=

main.go

@@ -5,7 +5,7 @@ import (
 	"log"
 
 	emailkeys "git.happydns.org/checker-email-keys/checker"
-	sdk "git.happydns.org/checker-sdk-go/checker"
+	"git.happydns.org/checker-sdk-go/checker/server"
 )
 
 // Version is the standalone binary's version. Override with:
@@ -20,8 +20,8 @@ func main() {
 
 	emailkeys.Version = Version
 
-	server := sdk.NewServer(emailkeys.Provider())
+	srv := server.New(emailkeys.Provider())
-	if err := server.ListenAndServe(*listenAddr); err != nil {
+	if err := srv.ListenAndServe(*listenAddr); err != nil {
 		log.Fatalf("server error: %v", err)
 	}
 }