docs: remove JSON examples from policy file docs (#945)

* docs: remove JSON examples from policy file docs

Signed-off-by: Xe Iaso <me@xeiaso.net>

* fix(lib): remove mentions of botPolicies.json in the tests

Signed-off-by: Xe Iaso <me@xeiaso.net>

* docs: update link to challenge methods

Signed-off-by: Xe Iaso <me@xeiaso.net>

* docs: unbreak links to the challenges category

Signed-off-by: Xe Iaso <me@xeiaso.net>

---------

Signed-off-by: Xe Iaso <me@xeiaso.net>

lib/anubis_test.go

@@ -169,7 +169,7 @@ func httpClient(t *testing.T) *http.Client {
 }
 
 func TestLoadPolicies(t *testing.T) {
-	for _, fname := range []string{"botPolicies.json", "botPolicies.yaml"} {
+	for _, fname := range []string{"botPolicies.yaml"} {
 		t.Run(fname, func(t *testing.T) {
 			fin, err := data.BotPolicies.Open(fname)
 			if err != nil {

lib/policy/config/check.go

@@ -0,0 +1,53 @@
+//go:build ignore
+
+package config
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+
+	"github.com/TecharoHQ/anubis/lib/checker"
+)
+
+var (
+	ErrUnknownCheckType = errors.New("config.Bot.Check: unknown check type")
+)
+
+type AllChecks struct {
+	All []Check `json:"all"`
+}
+
+type AnyChecks struct {
+	All []Check `json:"any"`
+}
+
+type Check struct {
+	Type string          `json:"type"`
+	Args json.RawMessage `json:"args"`
+}
+
+func (c *Check) Valid(ctx context.Context) error {
+	var errs []error
+
+	if len(c.Type) == 0 {
+		errs = append(errs, ErrNoStoreBackend)
+	}
+
+	fac, ok := checker.Get(c.Type)
+	switch ok {
+	case true:
+		if err := fac.Valid(ctx, c.Args); err != nil {
+			errs = append(errs, err)
+		}
+	case false:
+		errs = append(errs, fmt.Errorf("%w: %q", ErrUnknownCheckType, c.Type))
+	}
+
+	if len(errs) != 0 {
+		return errors.Join(errs...)
+	}
+
+	return nil
+}

lib/policy/policy_test.go

@@ -13,13 +13,13 @@ import (
 func TestDefaultPolicyMustParse(t *testing.T) {
 	ctx := thothmock.WithMockThoth(t)
 
-	fin, err := data.BotPolicies.Open("botPolicies.json")
+	fin, err := data.BotPolicies.Open("botPolicies.yaml")
 	if err != nil {
 		t.Fatal(err)
 	}
 	defer fin.Close()
 
-	if _, err := ParseConfig(ctx, fin, "botPolicies.json", anubis.DefaultDifficulty); err != nil {
+	if _, err := ParseConfig(ctx, fin, "botPolicies.yaml", anubis.DefaultDifficulty); err != nil {
 		t.Fatalf("can't parse config: %v", err)
 	}
 }