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package fcaptcha

import (

"context"

"encoding/json"

"errors"

"io"

"net/http"

"net/http/httptest"

"strings"

"sync"

"testing"

"time"

)

const testSecret = "verify-secret"

// fakeServer answers /api/token/verify the way server-go does: 401 on a bad

// secret, then a verdict per token from tokens. Each token is single use.

type fakeServer struct {

mu sync.Mutex

tokens map[string]map[string]any

used map[string]bool

last verifyRequest

}

func newFakeServer(t *testing.T, tokens map[string]map[string]any) (*fakeServer, *httptest.Server) {

t.Helper()

f := &fakeServer{tokens: tokens, used: map[string]bool{}}

srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {

if r.Method != http.MethodPost || r.URL.Path != "/api/token/verify" {

http.NotFound(w, r)

return

}

if ct := r.Header.Get("Content-Type"); ct != "application/json" {

t.Errorf("Content-Type = %q, want application/json", ct)

}

var req verifyRequest

if err := json.NewDecoder(r.Body).Decode(&req); err != nil {

http.Error(w, "Invalid request body", http.StatusBadRequest)

return

}

f.mu.Lock()

defer f.mu.Unlock()

f.last = req

w.Header().Set("Content-Type", "application/json")

if req.Secret != testSecret {

w.WriteHeader(http.StatusUnauthorized)

json.NewEncoder(w).Encode(map[string]any{"valid": false, "reason": "invalid_secret"})

return

}

data, ok := f.tokens[req.Token]

switch {

case !ok:

json.NewEncoder(w).Encode(map[string]any{"valid": false, "reason": "invalid_signature"})

case f.used[req.Token]:

json.NewEncoder(w).Encode(map[string]any{"valid": false, "reason": "token_already_used"})

default:

f.used[req.Token] = true

json.NewEncoder(w).Encode(data)

}

}))

t.Cleanup(srv.Close)

return f, srv

}

func validToken(action string, score float64) map[string]any {

return map[string]any{

"valid": true,

"site_key": "site-1",

"timestamp": 1703356800,

"score": score,

"ip_hash": "abc",

"hostname": "example.com",

"action": action,

"cdata": "order-42",

}

}

func TestVerifyValidToken(t *testing.T) {

f, srv := newFakeServer(t, map[string]map[string]any{"tok": validToken("login", 0.15)})

c := New(srv.URL+"/", testSecret)

got, err := c.Verify(context.Background(), "tok", "203.0.113.10")

if err != nil {

t.Fatal(err)

}

want := Result{

Valid: true,

Score: 0.15,

SiteKey: "site-1",

Hostname: "example.com",

Action: "login",

CData: "order-42",

IssuedAt: time.Unix(1703356800, 0).UTC(),

}

if *got != want {

t.Errorf("Verify = %+v, want %+v", *got, want)

}

if f.last.RemoteIP != "203.0.113.10" || f.last.Secret != testSecret {

t.Errorf("request = %+v", f.last)

}

}

func TestVerifyIsSingleUse(t *testing.T) {

_, srv := newFakeServer(t, map[string]map[string]any{"tok": validToken("", 0.1)})

c := New(srv.URL, testSecret)

if r, err := c.Verify(context.Background(), "tok", ""); err != nil || !r.Valid {

t.Fatalf("first Verify = %+v, %v", r, err)

}

r, err := c.Verify(context.Background(), "tok", "")

if err != nil {

t.Fatal(err)

}

if r.Valid || r.Reason != "token_already_used" {

t.Errorf("second Verify = %+v, want token_already_used", r)

}

if !r.IssuedAt.IsZero() {

t.Errorf("IssuedAt = %v on an invalid token", r.IssuedAt)

}

}

func TestVerifyMissingTokenSkipsNetwork(t *testing.T) {

c := New("http://127.0.0.1:1", testSecret)

r, err := c.Verify(context.Background(), "", "")

if err != nil {

t.Fatal(err)

}

if r.Valid || r.Reason != "missing_token" {

t.Errorf("Verify(\"\") = %+v", r)

}

}

func TestVerifyBadSecretIsAnError(t *testing.T) {

_, srv := newFakeServer(t, nil)

_, err := New(srv.URL, "wrong").Verify(context.Background(), "tok", "")

if !errors.Is(err, ErrUnauthorized) {

t.Fatalf("err = %v, want ErrUnauthorized", err)

}

if !strings.Contains(err.Error(), "invalid_secret") {

t.Errorf("err = %v, want the server's reason", err)

}

}

func TestVerifyServerFaults(t *testing.T) {

tests := []struct {

name string

handler http.HandlerFunc

want string

}{

{"401 without body", func(w http.ResponseWriter, r *http.Request) {

w.WriteHeader(http.StatusUnauthorized)

}, "secret rejected"},

{"500", func(w http.ResponseWriter, r *http.Request) {

w.WriteHeader(http.StatusInternalServerError)

}, "unexpected status 500"},

{"not JSON", func(w http.ResponseWriter, r *http.Request) {

io.WriteString(w, "<html>")

}, "decode response"},

{"state unavailable", func(w http.ResponseWriter, r *http.Request) {

io.WriteString(w, `{"valid":false,"reason":"state_unavailable"}`)

}, "state unavailable"},

}

for _, tt := range tests {

t.Run(tt.name, func(t *testing.T) {

srv := httptest.NewServer(tt.handler)

defer srv.Close()

r, err := New(srv.URL, testSecret).Verify(context.Background(), "tok", "")

if err == nil || !strings.Contains(err.Error(), tt.want) {

t.Fatalf("Verify = %+v, %v; want error containing %q", r, err, tt.want)

}

})

}

}

func TestVerifyUnreachable(t *testing.T) {

srv := httptest.NewServer(http.NotFoundHandler())

url := srv.URL

srv.Close()

if _, err := New(url, testSecret).Verify(context.Background(), "tok", ""); err == nil {

t.Fatal("Verify against a closed server succeeded")

}

}

func TestVerifyBadBaseURL(t *testing.T) {

if _, err := New("://bad", testSecret).Verify(context.Background(), "tok", ""); err == nil {

t.Fatal("Verify with a malformed base URL succeeded")

}

}

func TestVerifyTokenWithoutScore(t *testing.T) {

tok := validToken("", 0)

delete(tok, "score")

_, srv := newFakeServer(t, map[string]map[string]any{"tok": tok})

r, err := New(srv.URL, testSecret).Verify(context.Background(), "tok", "")

if err != nil || !r.Valid || r.Score != 0 {

t.Fatalf("Verify = %+v, %v", r, err)

}

}

func TestWithHTTPClient(t *testing.T) {

_, srv := newFakeServer(t, map[string]map[string]any{"tok": validToken("", 0.1)})

var used bool

hc := &http.Client{Transport: roundTripFunc(func(r *http.Request) (*http.Response, error) {

used = true

return http.DefaultTransport.RoundTrip(r)

})}

if _, err := New(srv.URL, testSecret, WithHTTPClient(hc)).Verify(context.Background(), "tok", ""); err != nil {

t.Fatal(err)

}

if !used {

t.Error("custom HTTP client was not used")

}

}

type roundTripFunc func(*http.Request) (*http.Response, error)

func (f roundTripFunc) RoundTrip(r *http.Request) (*http.Response, error) { return f(r) }